Calcium fluoride nanoparticles with various amounts of erbium ion dopants were prepared by CTAB/C_4 H_9OH/C_7H_(16)/H_2O reverse micro-emulsion method.The nanoparticles were studied by X-ray diffraction(XRD),transmiss...Calcium fluoride nanoparticles with various amounts of erbium ion dopants were prepared by CTAB/C_4 H_9OH/C_7H_(16)/H_2O reverse micro-emulsion method.The nanoparticles were studied by X-ray diffraction(XRD),transmission electron microscopy(TEM),fourier transform infrared spectroscopy(FTIR),absorption and fluorescence spectra.The XRD patterns indicate a typical cubic fluorite structure and no other impurities.TEM results show the synthesized particles having uniform grain size and without agglomeration.FTIR spectra reveal that there are some amounts of-OH,NO_3^-and other organic functional groups on the particle surfaces before the annealing process.Many absorption peaks and bands are present in the absorption spectra,corresponding to the rich energy levels of erbium ion.The Red-Shift of absorption bands and Blue-Shift of fluorescence peaks can be attributed to the weakened energy level split as a result of the decrease in crystal field strength.展开更多
Entomopathogenic viruses,such as baculoviruses and cypoviruses,have been employed as biological pesticides against agricultural and forestry pests.However,their susceptibility to inactivation under field UV radiation ...Entomopathogenic viruses,such as baculoviruses and cypoviruses,have been employed as biological pesticides against agricultural and forestry pests.However,their susceptibility to inactivation under field UV radiation has hindered their broader application.In this study,we effectively improved the UV resistance of insect virus occlusion bodies(OBs)by coating their surfaces with silica nanoparticles(SiO_(2)NPs).Monodisperse SiO_(2)NPs with uniform size distribution and excellent colloidal stability were synthesized using the Stober method.Subsequent amination modification of the SiO_(2)NPs with a silane coupling agent shifted their isoelectric point from 3.2 to 8.1.This modification imparted a strong positive charge to the NPs within the pH range of 4.5-5.5,while the OBs of insect viruses remained negatively charged in this range.Consequently,the amino-functionalized SiO_(2)NPs were successfully coated onto the surfaces of OBs of three representative insect viruses:nucleopolyhedrovirus,granulovirus,and cypovirus,through electrostatic interactions.Laboratory bioassays confirmed that Mamestra brassicae multiple nucleopolyhedrovirus(MbMNPV)coated with SiO_(2)-NH2 NPs retained its native viral pathogenicity against Spodoptera exigua larvae under normal laboratory condition,while it demonstrated 2.299-2.712 folds higher potency than MbMNPV physically mixed with unmodified SiO_(2)NPs after UV irradiation.Outdoor trials revealed that SiO_(2)-NH_(2)NPs coating significantly improved the survival time of MbMNPV,with the median survival time increased from 1.43 days to 5.15 days.This nanoparticle coating strategy establishes a robust platform for developing photostable biopesticides while preserving their ecological safety profiles.The modular nature of this approach suggests its broad applicability across different entomopathogenic virus formulations.展开更多
Wound healing remains a critical challenge in medical treatment,particularly for infected and complex wounds.This study introduces a novel spray able nanocomposite hydrogel dressing(SA/CaCl_(2)/CeO_(2),SCC)that demons...Wound healing remains a critical challenge in medical treatment,particularly for infected and complex wounds.This study introduces a novel spray able nanocomposite hydrogel dressing(SA/CaCl_(2)/CeO_(2),SCC)that demonstrates exceptional potential for accelerated wound healing and bacterial infection control.By integrating cerium oxide nanoparticles(CeO_(2)NPs)with sodium alginate(SA)and calcium chloride(CaCl_(2)),we developed a versatile and portable wound healing solution that possesses the ability to scavenge reactive oxygen species(ROS),remarkable biocompatibility,antibacterial properties,and regenerative capabilities.The synthesized SCC hydrogel was comprehensively characterized through advanced microscopic and spectroscopic techniques,revealing a unique nanostructured composition with intrinsic redox capacity.In vitro assessments demonstrated excellent cytocompatibility,hemocompatibility,and potent antibacterial activity against both gram-positive and gramnegative bacteria.In vivo rat wound model experiments further validated the hydrogel's therapeutic efficacy,showing significantly accelerated wound closure,reduced inflammatory responses,and enhanced tissue regeneration.Key innovations include the hydrothermal synthesis of CeO_(2)nanoparticles,a simple spray-induced crosslinking process,and the strategic incorporation of nanoparticles to modulate wound healing mechanisms.The SCC hydrogel exhibited superior performance in promoting granulation tissue formation,collagen deposition,and bacterial elimination,positioning it as a promising candidate for advanced wound management strategies.展开更多
In this paper,polyamide(PA)woven fabric was used as the base fabric,and polyurethane(PU)solution containing silica nanoparticles(PU@SiO_(2)NPs)was used as the coating solution to prepare composite tent fabric(PA/PU@Si...In this paper,polyamide(PA)woven fabric was used as the base fabric,and polyurethane(PU)solution containing silica nanoparticles(PU@SiO_(2)NPs)was used as the coating solution to prepare composite tent fabric(PA/PU@SiO_(2)).The morphology,structure,and durability of the tent fabric under ultraviolet(UV)radiation,waterstained,or thermal conditions were investigated.The results show that compared with PA/PU fabric without SiO_(2)NPs,when the mass fraction of SiO_(2)NPs in PU coating is 5%,the air permeability of PA/PU@SiO_(2)fabric decreases from about 7.5 to 6.0 nm/s,while the reflectivity to UVvisible light is significantly improved.The surface wettability decreases,as indicated by the average water contact angle(WCA)on PA/PU@SiO_(2)remaining stable at 47°after 9 min.After thermal treatment,the PA/PU@SiO_(2)fabric shows superior mechanical stability.The degradation rate of the tensile strength is only 6.3%,approximately half that of the PA/PU fabric.Meanwhile,the elongation at break increases to 98.9%,compared to 61.8%for the PA/PU fabric.展开更多
As a typical reactive composite hydrogen storage system,2LiBH_(4)-MgH_(2)holds an ultrahigh hydrogen storage capacity of 11.5 wt%.However,it suffers from sluggish hydrogen storage kinetics due to the difficult nucleat...As a typical reactive composite hydrogen storage system,2LiBH_(4)-MgH_(2)holds an ultrahigh hydrogen storage capacity of 11.5 wt%.However,it suffers from sluggish hydrogen storage kinetics due to the difficult nucleation of MgB_(2).Herein,amorphous VB_(2)nanoparticles with an average size of approximately 32 nm are synthesized to enhance the hydrogen storage performance of 2LiBH_(4)-MgH_(2)composite.VB_(2),sharing the same hexagonal structure with MgB_(2)with a d-value mismatch ratio of only 2.28%,could serve as effective nucleation sites for promoting the formation of MgB_(2).Theoretical calculations reveal that the introduction of VB_(2)significantly reduces the binding energies of B and Mg,facilitating in situ nucleation of MgB_(2).As a result,after the introduction of VB_(2)nanoparticles,complete hydrogen desorption of 9.23 wt%is achieved for 2LiBH_(4)-MgH_(2)within 2 h at 400℃,which is 4 times shorter than the time required for pure 2LiBH_(4)-MgH_(2),and no nucleation incubation period for hydrogen desorption is observed even at a low temperature of380℃.More importantly,a reversible capacity of9.3 wt%,corresponding to a capacity retention of 100%,could be preserved after 10 cycles of hydrogen storage,demonstrating stable reversible hydrogen storage performance.This study provides a novel technological pathway for improving the reversible hydrogen storage performance of composite metal hydrides and offers significant insights into the development of high-performance hydrogen storage materials.展开更多
Pure TiO_(2)and copper-modified titania(Cu/TiO_(2))nanoparticles were synthesized through sol gel combined with the pyrolysis method for the removal of Congo red(CR)in wastewater treatment.Surface morphology and struc...Pure TiO_(2)and copper-modified titania(Cu/TiO_(2))nanoparticles were synthesized through sol gel combined with the pyrolysis method for the removal of Congo red(CR)in wastewater treatment.Surface morphology and structural evaluation utilized XRD,TEM,Raman,FTIR and BET techniques.Cu/TiO_(2)showed rich defects and a higher specific surface area than that of TiO_(2).The 1Cu/TiO_(2)(molar ratio Cu/TiO_(2)of 1/100)showed the best performance to adsorption of CR solution at different reaction conditions(contact duration,CR concentration,adsorbent dose,temperature,and initial pH).Adsorption kinetics and equilibrium isotherms were well-described with a pseudo-second-order kinetics and Freundlich model,respectively.The negative ΔG indicates stable adsorption of CR on the Cu/TiO_(2)surface.The adsorption efficiency only decreases by 6%after 5 cycles of adsorption regeneration.The successful synthesis of Cu/TiO_(2)offers a new possibility to address the problems related to CR dye from aqueous solutions.展开更多
The p-block metal(In,Sn,Bi,etc.)-based electrocatalysts have exhibited excellent activity in the electrocatalytic CO_(2)reduction(ECR)to formate.However,the rapid decrease in catalytic activity caused by catalyst reco...The p-block metal(In,Sn,Bi,etc.)-based electrocatalysts have exhibited excellent activity in the electrocatalytic CO_(2)reduction(ECR)to formate.However,the rapid decrease in catalytic activity caused by catalyst reconstruction and agglomeration under ECR conditions significantly restricts their practical applications.Herein,we developed a sulfur anchoring strategy to stabilize the high-density sub-3 nm In_(2)S_(3)nanoparticles on sulfur-doped porous carbon substrates(i-In_(2)S_(3)/S-C)for formate production.Systematic characterizations evidenced that the as-prepared catalyst exhibited a strong metal sulfide-support interaction(MSSI),which effectively regulated the electronic states of In_(2)S_(3),achieving a high formate Faradaic efficiency of 91%at−0.95 V vs.RHE.More importantly,the sulfur anchoring effectively immobilized the sub-3 nm In_(2)S_(3)nanoparticles to prevent them from agglomeration.It enabled the catalysts to exhibit much higher durability than the In_(2)S_(3)samples without sulfur anchoring,demonstrating that the strong MSSI and fast charge transfer on the catalytic interface could significantly promote the structural stability of In_(2)S_(3)catalysts.These results provide a viable approach for developing efficient and stable electrocatalysts for CO_(2)reduction.展开更多
In this study,the corrosion resistance and the stability of passive films on the laser melting depositionprocessed 316L austenitic stainless steel with varying CeO_(2)contents in the environment of proton exchange mem...In this study,the corrosion resistance and the stability of passive films on the laser melting depositionprocessed 316L austenitic stainless steel with varying CeO_(2)contents in the environment of proton exchange membrane fuel cells were investigated using a combination of electrochemical and microstructural analyses.The findings reveal that 316L austenitic stainless steel with 0.20 wt%CeO_(2)exhibits a superior corrosion resistance,primarily due to grain refinement,a high proportion of low-angle grain boundaries and low∑coincidence site lattice grain boundaries,as well as increased dislocation density.The addition of CeO_(2)optimizes the type and size of inclusions and exerts a drag effect on grain boundaries,promoting the refinement of grains in the laser melting deposition-processed 316L auste nitic stainless steel.Moreover,the combined effect of these factors provides more active sites for the formation of a dense passive film with fewer point defects.展开更多
Synergistic interplays involving multiple active centers originating from TiO2 nanotube layers(TNT)and ruthenium(Ru)species comprising of both single atoms(SAs)and nanoparticles(NPs)augment the alkaline hydrogen evolu...Synergistic interplays involving multiple active centers originating from TiO2 nanotube layers(TNT)and ruthenium(Ru)species comprising of both single atoms(SAs)and nanoparticles(NPs)augment the alkaline hydrogen evolution reaction(HER)by enhancing Volmer kinetics from rapid water dissociation and improving Tafel kinetics from efficient H*desorption.Atomic layer deposition of Ru with 50 process cycles results in a mixture of Ru SAs and 2.8-0.4 nm NPs present on TNT layers,and it emerges with the highest HER activity among all the electrodes synthesized.A detailed study of the Ti and Ru species using different high-resolution techniques confirmed the presence of Ti^(3+)states and the coexistence of Ru SAs and NPs.With insights from literature,the role of Ti^(3+),appropriate work functions of TNT layers and Ru,and the synergistic effect of Ru SAs and Ru NPs in improving the performance of alkaline HER were elaborated and justified.The aforementioned characteristics led to a remarkable performance by having 9mV onset potentials and 33 mV dec^(-1) of Tafel slopes and a higher turnover frequency of 1.72 H2 s^(-1) at 30 mV.Besides,a notable stability from 28 h staircase chronopotentiometric measurements for TNT@Ru surpasses TNT@Pt in comparison.展开更多
Photoheranostics have emerged as a promising tool for cancer theranostics owing to their real-time feedback on treatment and their precise diagnosis.Among them,how to improve the photothermal conversion efficiency(PCE...Photoheranostics have emerged as a promising tool for cancer theranostics owing to their real-time feedback on treatment and their precise diagnosis.Among them,how to improve the photothermal conversion efficiency(PCE)of phototheranostic agents(PTAs)is the key factor for phototheranostic systems.Herein,we provided an efficient method to improve PCE and constructed a biocompatible nano-material ICR-Qu@NH_(2)-Fe_(3)O_(4)@PEG(QNFP)by combing near-infrared second region(NIR-Ⅱ)molecular dye ICR-Qu and amino-modified magnetic nanoparticles and then encapsulated by DSPE-m PEG2000.QNFP exhibited excellent performance for photothermal therapy with a high PCE of 95.6%.Both in vitro and in vivo experiments indicated that QNFP could inhibit the growth of tumors under laser irradiation with low toxicity and realized real-time NIR-Ⅱfiuorescent imaging of tumors.In general,we realized a simple but efficient method to improve the PCE of NIR-Ⅱmolecular dye without reduce its quantum yield,which is an ideal choice for cancer diagnosis and treatment.展开更多
Calcium fluoride nanoparticles were synthesized by water/cetyltrimethylammonium bromide (CTAB)/2-octanol microemulsion systems. X-ray powder diffraction analysis showed that the products were a single phase. The resul...Calcium fluoride nanoparticles were synthesized by water/cetyltrimethylammonium bromide (CTAB)/2-octanol microemulsion systems. X-ray powder diffraction analysis showed that the products were a single phase. The result of scanning electron microscopy confirmed that the average sizes of the calcium fluoride particles were below 100 nm in diameter. With decreasing water content and reaction time, the particle sizes decreased.展开更多
A new combination method consisting of ball milling, carbothermic reduction and hydrochloric acid leaching was proposed for the preparation of nanosized synthetic rutile from natural ilmenite. The ball milling was emp...A new combination method consisting of ball milling, carbothermic reduction and hydrochloric acid leaching was proposed for the preparation of nanosized synthetic rutile from natural ilmenite. The ball milling was employed to grind ilmenite into small particles. The carbothermic reduction was carried out to yield a high titanium slag, which would be easily purified by subsequent leaching procedure. Factors affecting the hydrochloric acid process, namely the leaching time, temperature, and acid concentration, were studied. After leaching and calcining the milled and annealed mixture of FeTiO3/C under the optimal conditions, the TiO2 nanoparticles with size of 10-200 nm and purity〉98.0% were obtained.展开更多
Cu2O@Cu2O core-shell nanoparticles (NPs) were prepared by using solution phase strategy. It was found that Cu2O@Cu2O NPs were easily converted to Cu2O@Cu NPs with the help of polyvinylpyrrolidine (PVP) and excessive a...Cu2O@Cu2O core-shell nanoparticles (NPs) were prepared by using solution phase strategy. It was found that Cu2O@Cu2O NPs were easily converted to Cu2O@Cu NPs with the help of polyvinylpyrrolidine (PVP) and excessive ascorbic acid (AA) in air at room temperature, which was an interesting phenomenon. The features of the two kinds of NPs were characterized by XRD, TEM and extinction spectra. Cu2O@Cu NPs with different shell thicknesses showed wide tunable optical properties for the localized surface plasmon (LSP) in metallic Cu. But Cu2O@Cu2O NPs did not indicate this feature. FTIR results reveal that Cu+ ions on the surface of Cu2O shell coordinate with N and O atoms in PVP and are further reduced to metallic Cu by excessive AA and then form a nucleation site on the surface of Cu2O nanocrystalline. PVP binds onto different sites to proceed with the reduction utill all the Cu sources in Cu2O shell are completely assumed.展开更多
SnO2 nanoparticles with the average particle size of 5-30 nm were synthesized using SnCl4·5H2O as the precursor and NH3·H2O as the mineralizing agent by hydrothermal method.In the case of 1 kg/batch producti...SnO2 nanoparticles with the average particle size of 5-30 nm were synthesized using SnCl4·5H2O as the precursor and NH3·H2O as the mineralizing agent by hydrothermal method.In the case of 1 kg/batch production,the effects of synthesis conditions including solution concentration,reaction temperature,pressure,time and pH value on the grain size,particle morphology and crystal structure of SnO2 were systematically studied.The particles were characterized by X-ray diffraction（XRD） and transmission electron microscopy（TEM）.The results show that,the particle size can be well controlled in the range of 5-30 nm by adjusting the processing parameters such as reaction temperature and time when the crystal structure and particle morphology remain unchanged.The previous reports,the unusual dependences of the grain size of SnO2 on reaction temperature and time were found.The mechanism for such abnormal grain growth behavior was tentatively elucidated.展开更多
The preparation of Cu nanoparticles by the aqueous solution reduction method was investigated. The effects of different reaction parameters on the preparation of Cu nanoparticles were studied. The optimum conditions f...The preparation of Cu nanoparticles by the aqueous solution reduction method was investigated. The effects of different reaction parameters on the preparation of Cu nanoparticles were studied. The optimum conditions for preparing well-dispersed nanoparticles were found as follows: 0.4 mol/L NaBH4 was added into solution containing 0.2 mol/L Cu2+, 1.0% gelatin dispersant in mass fraction, and 1.2 mol/L NH3?H2O at pH 12 and 313 K. In addition, a series of experiments were performed to discover the reaction process. NH3?H2O was found to be able to modulate the reaction process. At pH=10, Cu2+ was transformed to Cu(NH3)42+ as precursor after the addition of NH3?H2O, and then Cu(NH3)42+ was reduced by NaBH4 solution. At pH=12, Cu2+ was transformed to Cu(OH)2 as precursor after the addition of NH3?H2O, and Cu(OH)2 was then reduced by NaBH4 solution.展开更多
Nanoparticles have been widely applied in diagnosis and therapy due to the high loading of insoluble drug, increased target accumulation and interaction with biological tissues. Recently, severe side effects of nanopa...Nanoparticles have been widely applied in diagnosis and therapy due to the high loading of insoluble drug, increased target accumulation and interaction with biological tissues. Recently, severe side effects of nanoparticles have been reported, but the underlying mechanism remains largely unknown. In our study, we aim to understand the safety of paclitaxel （PTX） loaded bovine albumin nanoparticles （BNPs） and active targeted PTX loaded BNPs to normal vital organ or tissue in vivo. The anti-human epidermal growth factor receptor 2 （HER2/neu） peptide mimetic （AHNP） was covalent bound to surface of BNPs （AHNP-BNPs） to exert selected delivery to HER2＋ cells. In HER2＋ tumor xenographs, saline （control）, PTX traditional formula （medium of Cremophor EL-ethanol）, BNPs, and AHNP-BNPs were administrated to evaluate the toxicity. There is no severe neutropenia or anemia with treatment of BNPs and AHNP-BNPs compared with traditional PTX injection. We also evaluated their damage on normal organs, including liver, kidney, spleen, lung and heart to fully estimate the safety of AHNP-BNPs and BNPs delivery systems. We observed similar toxicity in liver and lung in mice treated with BNPs or PTX injection, but decreased liver damage in mice treated with AHNP-BNPs. Further studies are rcouired to confirm our conclusion.展开更多
基金funded by the National Natural Science Foundation of China(NO.51072144)State Key Laboratory of Advanced Technology for Materials Synthesis and Processing(Wuhan University of Technology)(NO.2009-ZT-1)
文摘Calcium fluoride nanoparticles with various amounts of erbium ion dopants were prepared by CTAB/C_4 H_9OH/C_7H_(16)/H_2O reverse micro-emulsion method.The nanoparticles were studied by X-ray diffraction(XRD),transmission electron microscopy(TEM),fourier transform infrared spectroscopy(FTIR),absorption and fluorescence spectra.The XRD patterns indicate a typical cubic fluorite structure and no other impurities.TEM results show the synthesized particles having uniform grain size and without agglomeration.FTIR spectra reveal that there are some amounts of-OH,NO_3^-and other organic functional groups on the particle surfaces before the annealing process.Many absorption peaks and bands are present in the absorption spectra,corresponding to the rich energy levels of erbium ion.The Red-Shift of absorption bands and Blue-Shift of fluorescence peaks can be attributed to the weakened energy level split as a result of the decrease in crystal field strength.
基金supported by the Key R&D Program of Ningxia Hui Autonomous Region(2023BCF01045).
文摘Entomopathogenic viruses,such as baculoviruses and cypoviruses,have been employed as biological pesticides against agricultural and forestry pests.However,their susceptibility to inactivation under field UV radiation has hindered their broader application.In this study,we effectively improved the UV resistance of insect virus occlusion bodies(OBs)by coating their surfaces with silica nanoparticles(SiO_(2)NPs).Monodisperse SiO_(2)NPs with uniform size distribution and excellent colloidal stability were synthesized using the Stober method.Subsequent amination modification of the SiO_(2)NPs with a silane coupling agent shifted their isoelectric point from 3.2 to 8.1.This modification imparted a strong positive charge to the NPs within the pH range of 4.5-5.5,while the OBs of insect viruses remained negatively charged in this range.Consequently,the amino-functionalized SiO_(2)NPs were successfully coated onto the surfaces of OBs of three representative insect viruses:nucleopolyhedrovirus,granulovirus,and cypovirus,through electrostatic interactions.Laboratory bioassays confirmed that Mamestra brassicae multiple nucleopolyhedrovirus(MbMNPV)coated with SiO_(2)-NH2 NPs retained its native viral pathogenicity against Spodoptera exigua larvae under normal laboratory condition,while it demonstrated 2.299-2.712 folds higher potency than MbMNPV physically mixed with unmodified SiO_(2)NPs after UV irradiation.Outdoor trials revealed that SiO_(2)-NH_(2)NPs coating significantly improved the survival time of MbMNPV,with the median survival time increased from 1.43 days to 5.15 days.This nanoparticle coating strategy establishes a robust platform for developing photostable biopesticides while preserving their ecological safety profiles.The modular nature of this approach suggests its broad applicability across different entomopathogenic virus formulations.
基金financially supported by the National Natural Science Foundation of China(No.81802690)the Natural Science Foundation of Shaanxi Province(No.S2024-JCYB-1354)
文摘Wound healing remains a critical challenge in medical treatment,particularly for infected and complex wounds.This study introduces a novel spray able nanocomposite hydrogel dressing(SA/CaCl_(2)/CeO_(2),SCC)that demonstrates exceptional potential for accelerated wound healing and bacterial infection control.By integrating cerium oxide nanoparticles(CeO_(2)NPs)with sodium alginate(SA)and calcium chloride(CaCl_(2)),we developed a versatile and portable wound healing solution that possesses the ability to scavenge reactive oxygen species(ROS),remarkable biocompatibility,antibacterial properties,and regenerative capabilities.The synthesized SCC hydrogel was comprehensively characterized through advanced microscopic and spectroscopic techniques,revealing a unique nanostructured composition with intrinsic redox capacity.In vitro assessments demonstrated excellent cytocompatibility,hemocompatibility,and potent antibacterial activity against both gram-positive and gramnegative bacteria.In vivo rat wound model experiments further validated the hydrogel's therapeutic efficacy,showing significantly accelerated wound closure,reduced inflammatory responses,and enhanced tissue regeneration.Key innovations include the hydrothermal synthesis of CeO_(2)nanoparticles,a simple spray-induced crosslinking process,and the strategic incorporation of nanoparticles to modulate wound healing mechanisms.The SCC hydrogel exhibited superior performance in promoting granulation tissue formation,collagen deposition,and bacterial elimination,positioning it as a promising candidate for advanced wound management strategies.
文摘In this paper,polyamide(PA)woven fabric was used as the base fabric,and polyurethane(PU)solution containing silica nanoparticles(PU@SiO_(2)NPs)was used as the coating solution to prepare composite tent fabric(PA/PU@SiO_(2)).The morphology,structure,and durability of the tent fabric under ultraviolet(UV)radiation,waterstained,or thermal conditions were investigated.The results show that compared with PA/PU fabric without SiO_(2)NPs,when the mass fraction of SiO_(2)NPs in PU coating is 5%,the air permeability of PA/PU@SiO_(2)fabric decreases from about 7.5 to 6.0 nm/s,while the reflectivity to UVvisible light is significantly improved.The surface wettability decreases,as indicated by the average water contact angle(WCA)on PA/PU@SiO_(2)remaining stable at 47°after 9 min.After thermal treatment,the PA/PU@SiO_(2)fabric shows superior mechanical stability.The degradation rate of the tensile strength is only 6.3%,approximately half that of the PA/PU fabric.Meanwhile,the elongation at break increases to 98.9%,compared to 61.8%for the PA/PU fabric.
基金financially supported by the National Key R&D Program of China(No.2021YFB 3802400)the National Natural Science Foundation of China(Nos.U2130208,22279020 and 52301264)the Science and Technology Commission of Shanghai Municipality(Nos.23ZR1406500 and 22ZR1406500)
文摘As a typical reactive composite hydrogen storage system,2LiBH_(4)-MgH_(2)holds an ultrahigh hydrogen storage capacity of 11.5 wt%.However,it suffers from sluggish hydrogen storage kinetics due to the difficult nucleation of MgB_(2).Herein,amorphous VB_(2)nanoparticles with an average size of approximately 32 nm are synthesized to enhance the hydrogen storage performance of 2LiBH_(4)-MgH_(2)composite.VB_(2),sharing the same hexagonal structure with MgB_(2)with a d-value mismatch ratio of only 2.28%,could serve as effective nucleation sites for promoting the formation of MgB_(2).Theoretical calculations reveal that the introduction of VB_(2)significantly reduces the binding energies of B and Mg,facilitating in situ nucleation of MgB_(2).As a result,after the introduction of VB_(2)nanoparticles,complete hydrogen desorption of 9.23 wt%is achieved for 2LiBH_(4)-MgH_(2)within 2 h at 400℃,which is 4 times shorter than the time required for pure 2LiBH_(4)-MgH_(2),and no nucleation incubation period for hydrogen desorption is observed even at a low temperature of380℃.More importantly,a reversible capacity of9.3 wt%,corresponding to a capacity retention of 100%,could be preserved after 10 cycles of hydrogen storage,demonstrating stable reversible hydrogen storage performance.This study provides a novel technological pathway for improving the reversible hydrogen storage performance of composite metal hydrides and offers significant insights into the development of high-performance hydrogen storage materials.
基金supported by the Inner Mongolia Natural Science Foundation(2024QN02011)basic scientific research business expense project of colleges and universities directly under Inner Mongolia(2023QNJS131 and 2024QNJS127)Science and Technology Plan Program of Inner Mongolia Autonomous Region(2023YFDZ0031).
文摘Pure TiO_(2)and copper-modified titania(Cu/TiO_(2))nanoparticles were synthesized through sol gel combined with the pyrolysis method for the removal of Congo red(CR)in wastewater treatment.Surface morphology and structural evaluation utilized XRD,TEM,Raman,FTIR and BET techniques.Cu/TiO_(2)showed rich defects and a higher specific surface area than that of TiO_(2).The 1Cu/TiO_(2)(molar ratio Cu/TiO_(2)of 1/100)showed the best performance to adsorption of CR solution at different reaction conditions(contact duration,CR concentration,adsorbent dose,temperature,and initial pH).Adsorption kinetics and equilibrium isotherms were well-described with a pseudo-second-order kinetics and Freundlich model,respectively.The negative ΔG indicates stable adsorption of CR on the Cu/TiO_(2)surface.The adsorption efficiency only decreases by 6%after 5 cycles of adsorption regeneration.The successful synthesis of Cu/TiO_(2)offers a new possibility to address the problems related to CR dye from aqueous solutions.
文摘The p-block metal(In,Sn,Bi,etc.)-based electrocatalysts have exhibited excellent activity in the electrocatalytic CO_(2)reduction(ECR)to formate.However,the rapid decrease in catalytic activity caused by catalyst reconstruction and agglomeration under ECR conditions significantly restricts their practical applications.Herein,we developed a sulfur anchoring strategy to stabilize the high-density sub-3 nm In_(2)S_(3)nanoparticles on sulfur-doped porous carbon substrates(i-In_(2)S_(3)/S-C)for formate production.Systematic characterizations evidenced that the as-prepared catalyst exhibited a strong metal sulfide-support interaction(MSSI),which effectively regulated the electronic states of In_(2)S_(3),achieving a high formate Faradaic efficiency of 91%at−0.95 V vs.RHE.More importantly,the sulfur anchoring effectively immobilized the sub-3 nm In_(2)S_(3)nanoparticles to prevent them from agglomeration.It enabled the catalysts to exhibit much higher durability than the In_(2)S_(3)samples without sulfur anchoring,demonstrating that the strong MSSI and fast charge transfer on the catalytic interface could significantly promote the structural stability of In_(2)S_(3)catalysts.These results provide a viable approach for developing efficient and stable electrocatalysts for CO_(2)reduction.
基金Project supported by National Natural Science Foundation of China(52071227)Central Government Guidance to Local Science and Technology Development(YDZJSK20231A046)Key Scientific Research Project in Shanxi Province(202102050201003,202102050201010)。
文摘In this study,the corrosion resistance and the stability of passive films on the laser melting depositionprocessed 316L austenitic stainless steel with varying CeO_(2)contents in the environment of proton exchange membrane fuel cells were investigated using a combination of electrochemical and microstructural analyses.The findings reveal that 316L austenitic stainless steel with 0.20 wt%CeO_(2)exhibits a superior corrosion resistance,primarily due to grain refinement,a high proportion of low-angle grain boundaries and low∑coincidence site lattice grain boundaries,as well as increased dislocation density.The addition of CeO_(2)optimizes the type and size of inclusions and exerts a drag effect on grain boundaries,promoting the refinement of grains in the laser melting deposition-processed 316L auste nitic stainless steel.Moreover,the combined effect of these factors provides more active sites for the formation of a dense passive film with fewer point defects.
基金support from the European Union Horizon 2020 program(project HERMES,nr.952184)the Ministry of Education,Youth and Sports of the Czech Republic for supporting CEMNAT(LM2023037)+1 种基金Czech-NanoLab(LM2023051)infrastructures for providing ALD,SEM,EDX,XPS,TEM,and XRDCzech Science Foundation(project 23-08019X,EXPRO).
文摘Synergistic interplays involving multiple active centers originating from TiO2 nanotube layers(TNT)and ruthenium(Ru)species comprising of both single atoms(SAs)and nanoparticles(NPs)augment the alkaline hydrogen evolution reaction(HER)by enhancing Volmer kinetics from rapid water dissociation and improving Tafel kinetics from efficient H*desorption.Atomic layer deposition of Ru with 50 process cycles results in a mixture of Ru SAs and 2.8-0.4 nm NPs present on TNT layers,and it emerges with the highest HER activity among all the electrodes synthesized.A detailed study of the Ti and Ru species using different high-resolution techniques confirmed the presence of Ti^(3+)states and the coexistence of Ru SAs and NPs.With insights from literature,the role of Ti^(3+),appropriate work functions of TNT layers and Ru,and the synergistic effect of Ru SAs and Ru NPs in improving the performance of alkaline HER were elaborated and justified.The aforementioned characteristics led to a remarkable performance by having 9mV onset potentials and 33 mV dec^(-1) of Tafel slopes and a higher turnover frequency of 1.72 H2 s^(-1) at 30 mV.Besides,a notable stability from 28 h staircase chronopotentiometric measurements for TNT@Ru surpasses TNT@Pt in comparison.
基金financially supported by the National Natural Science Foundation of China(Nos.U21A20308,22077088)Foundation from Science and Technology Major Project of Tibetan Autonomous Region of China(No.XZ202201ZD0001G)Foundation from Science and Technology Department of Sichuan Province(No.2021ZHCG0025)。
文摘Photoheranostics have emerged as a promising tool for cancer theranostics owing to their real-time feedback on treatment and their precise diagnosis.Among them,how to improve the photothermal conversion efficiency(PCE)of phototheranostic agents(PTAs)is the key factor for phototheranostic systems.Herein,we provided an efficient method to improve PCE and constructed a biocompatible nano-material ICR-Qu@NH_(2)-Fe_(3)O_(4)@PEG(QNFP)by combing near-infrared second region(NIR-Ⅱ)molecular dye ICR-Qu and amino-modified magnetic nanoparticles and then encapsulated by DSPE-m PEG2000.QNFP exhibited excellent performance for photothermal therapy with a high PCE of 95.6%.Both in vitro and in vivo experiments indicated that QNFP could inhibit the growth of tumors under laser irradiation with low toxicity and realized real-time NIR-Ⅱfiuorescent imaging of tumors.In general,we realized a simple but efficient method to improve the PCE of NIR-Ⅱmolecular dye without reduce its quantum yield,which is an ideal choice for cancer diagnosis and treatment.
文摘Calcium fluoride nanoparticles were synthesized by water/cetyltrimethylammonium bromide (CTAB)/2-octanol microemulsion systems. X-ray powder diffraction analysis showed that the products were a single phase. The result of scanning electron microscopy confirmed that the average sizes of the calcium fluoride particles were below 100 nm in diameter. With decreasing water content and reaction time, the particle sizes decreased.
基金Project (2007CB613601) supported by the National Basic Research Program of ChinaProject supported by the Postdoctoral Science Foundation of Central South University, China
文摘A new combination method consisting of ball milling, carbothermic reduction and hydrochloric acid leaching was proposed for the preparation of nanosized synthetic rutile from natural ilmenite. The ball milling was employed to grind ilmenite into small particles. The carbothermic reduction was carried out to yield a high titanium slag, which would be easily purified by subsequent leaching procedure. Factors affecting the hydrochloric acid process, namely the leaching time, temperature, and acid concentration, were studied. After leaching and calcining the milled and annealed mixture of FeTiO3/C under the optimal conditions, the TiO2 nanoparticles with size of 10-200 nm and purity〉98.0% were obtained.
基金Projects(41172110,61107090)supported by the National Natural Science Foundation of China
文摘Cu2O@Cu2O core-shell nanoparticles (NPs) were prepared by using solution phase strategy. It was found that Cu2O@Cu2O NPs were easily converted to Cu2O@Cu NPs with the help of polyvinylpyrrolidine (PVP) and excessive ascorbic acid (AA) in air at room temperature, which was an interesting phenomenon. The features of the two kinds of NPs were characterized by XRD, TEM and extinction spectra. Cu2O@Cu NPs with different shell thicknesses showed wide tunable optical properties for the localized surface plasmon (LSP) in metallic Cu. But Cu2O@Cu2O NPs did not indicate this feature. FTIR results reveal that Cu+ ions on the surface of Cu2O shell coordinate with N and O atoms in PVP and are further reduced to metallic Cu by excessive AA and then form a nucleation site on the surface of Cu2O nanocrystalline. PVP binds onto different sites to proceed with the reduction utill all the Cu sources in Cu2O shell are completely assumed.
基金Project(2006AA03Z413) supported by the Hi-tech Research and Development Program of China
文摘SnO2 nanoparticles with the average particle size of 5-30 nm were synthesized using SnCl4·5H2O as the precursor and NH3·H2O as the mineralizing agent by hydrothermal method.In the case of 1 kg/batch production,the effects of synthesis conditions including solution concentration,reaction temperature,pressure,time and pH value on the grain size,particle morphology and crystal structure of SnO2 were systematically studied.The particles were characterized by X-ray diffraction（XRD） and transmission electron microscopy（TEM）.The results show that,the particle size can be well controlled in the range of 5-30 nm by adjusting the processing parameters such as reaction temperature and time when the crystal structure and particle morphology remain unchanged.The previous reports,the unusual dependences of the grain size of SnO2 on reaction temperature and time were found.The mechanism for such abnormal grain growth behavior was tentatively elucidated.
文摘The preparation of Cu nanoparticles by the aqueous solution reduction method was investigated. The effects of different reaction parameters on the preparation of Cu nanoparticles were studied. The optimum conditions for preparing well-dispersed nanoparticles were found as follows: 0.4 mol/L NaBH4 was added into solution containing 0.2 mol/L Cu2+, 1.0% gelatin dispersant in mass fraction, and 1.2 mol/L NH3?H2O at pH 12 and 313 K. In addition, a series of experiments were performed to discover the reaction process. NH3?H2O was found to be able to modulate the reaction process. At pH=10, Cu2+ was transformed to Cu(NH3)42+ as precursor after the addition of NH3?H2O, and then Cu(NH3)42+ was reduced by NaBH4 solution. At pH=12, Cu2+ was transformed to Cu(OH)2 as precursor after the addition of NH3?H2O, and Cu(OH)2 was then reduced by NaBH4 solution.
基金the National Natural Science Foundation of China(Grant No.30970785,81273454)Beijing Natural Science Foundation(Grant No.7132113)+2 种基金National Basic Research Program(Grant No.2009CB930303,2013CB932501)Doctoral Foundation of the Ministry of Education(Grant No.20100001110056)Innovation Team of Ministry of Education(Grant No.BMU20110263)
文摘Nanoparticles have been widely applied in diagnosis and therapy due to the high loading of insoluble drug, increased target accumulation and interaction with biological tissues. Recently, severe side effects of nanoparticles have been reported, but the underlying mechanism remains largely unknown. In our study, we aim to understand the safety of paclitaxel （PTX） loaded bovine albumin nanoparticles （BNPs） and active targeted PTX loaded BNPs to normal vital organ or tissue in vivo. The anti-human epidermal growth factor receptor 2 （HER2/neu） peptide mimetic （AHNP） was covalent bound to surface of BNPs （AHNP-BNPs） to exert selected delivery to HER2＋ cells. In HER2＋ tumor xenographs, saline （control）, PTX traditional formula （medium of Cremophor EL-ethanol）, BNPs, and AHNP-BNPs were administrated to evaluate the toxicity. There is no severe neutropenia or anemia with treatment of BNPs and AHNP-BNPs compared with traditional PTX injection. We also evaluated their damage on normal organs, including liver, kidney, spleen, lung and heart to fully estimate the safety of AHNP-BNPs and BNPs delivery systems. We observed similar toxicity in liver and lung in mice treated with BNPs or PTX injection, but decreased liver damage in mice treated with AHNP-BNPs. Further studies are rcouired to confirm our conclusion.
