Electrostatic self-assembly method （ESAM） was used to prepare bentonite supported-nano titanium dioxide photocatalysts. The materials were characterized by X-ray diffraction （XRD）, fourier transform infrared spect...Electrostatic self-assembly method （ESAM） was used to prepare bentonite supported-nano titanium dioxide photocatalysts. The materials were characterized by X-ray diffraction （XRD）, fourier transform infrared spectroscopy （FT-IR） and scanning electron microscopy （SEM）. Methyl orange was used to estimate the photocatalytic activity of the materials. The effects of the calcination temperature and silane dosage on the photocatalytic activity of the samples were investigated. The experimental results show that the bentonite facilitates the formation of anatase and restrains the transformation of anatase to rutile. Part of nano-size TiO2 particles insert into the galleries of bentonite. The photocatalysts exhibit a synergistic effect of adsorption and photocatalysis on methyl orange. Photocatalysts prepared by ESAM method exhibit higher photocatalytic activity and better recycle ability than those of the traditional method.展开更多
In this study,the workability of cement-based grouts containing n-TiO 2 nanoparticles and fly ash has been investigated experimentally.Several characteristic quantities(including,but not limited to,the marsh cone flow...In this study,the workability of cement-based grouts containing n-TiO 2 nanoparticles and fly ash has been investigated experimentally.Several characteristic quantities(including,but not limited to,the marsh cone flow time,the mini slump spreading diameter and the plate cohesion meter value)have been measured for different percentages of these additives.The use of fly ash as a mineral additive has been found to result in improvements in terms of workability behavior as expected.Moreover,if nano titanium oxide is also used,an improvement can be obtained regarding the bleeding values for the cement-based grout mixes.Using such experimental data,a multi-layer perceptron artificial neural network model has been developed(5 neurons in the hidden layer of the network model have been developed using a total of 42 experimental data).70%of the data employed in this model have been used for training,15%for validation and 15%for the test phase.The results demonstrate that the artificial neural network model can predict Marsh cone flow time,mini slump spreading diameter and plate cohesion meter values with an average error of 0.15%.展开更多
New applications and research progress of nano titanium dioxide （TiO2） in coating, environmental protection, chemical industries, cos- metics industry, electronic industrial products, medicine, health and food proce...New applications and research progress of nano titanium dioxide （TiO2） in coating, environmental protection, chemical industries, cos- metics industry, electronic industrial products, medicine, health and food processing fields were summarized in the paper. The results showed that nano TiO2 is the most dynamic one in the new nano material study today, which will have a very important impact on our social economic develop- ment in future. The research and utilization will give people＇s lives enormous changes.展开更多
Concrete is among the most utilized and essential construction materials in terms of strengthening the structure.The use of natural aggregates can be reduced by using crumb rubber aggregates(RA)as a substitute.The use...Concrete is among the most utilized and essential construction materials in terms of strengthening the structure.The use of natural aggregates can be reduced by using crumb rubber aggregates(RA)as a substitute.The use of RA will reduce the expense on aggregate and help in creating a sustainable environment.Nanoparticles improve the microscopic structure of concrete by filling pores present in cement paste thus reducing the cement usage in the mix.Employing nano titanium dioxide(NT)in rubber concrete(RC)helps to improve its properties.The findings showed that RA significantly alters the characteristics of the concrete;at a 15%level of fine aggregate(FA)replacement,the workability and density of the concrete mixes dropped by up to 26.53%and 5%,respectively.Concrete's compressive,tensile,and flexural strengths decreased by 16.1%,5.52%,and 3.1%,respectively,as a result of adding RA.However,these negative effects were successfully offset by the addition of NT.Even while workability declined,density grew.The research shows that the use of NT in RC composites enhances corrosion resistance and durability,reduces porosity,and improves permeability.The research also suggests that NT helps to smoothen pores and microcracks in concrete,resulting in enhanced resistance to elements such as water and air.This study employs analysis of variance to evaluate the mechanical and durability characteristics of rubberized concrete composites.Microstructural investigation employing field emission scanning electron microscopy examines the interfacial transition zone,hydration products,and pore structure,offering insights into the influence of NT on concrete matrix.This study offers thorough,significant information on the application of NT nanoparticles as a green and efficient additive to enhance concrete performance,and it also presents potential for additional studies in this area of study.展开更多
Modifed starch flms are gaining attention as biodegradable and sustainable materials in the food packaging industry.However,their inherent properties,including their brittleness and low antimicrobial and antioxidant c...Modifed starch flms are gaining attention as biodegradable and sustainable materials in the food packaging industry.However,their inherent properties,including their brittleness and low antimicrobial and antioxidant capacities,limit their extensive application.To address these shortcomings,in this study,a composite flm was developed using potato-modifed starch(PMS)as the base material,enhanced with konjac glucomannan(KGM),Pleurotus citrinopileatus polysaccharide(PCP),and nano titanium dioxide(nano TiO_(2)).Additionally,PCP and nano TiO_(2),which are bioactive components,were incorporated to improve the functional properties of the flms,promoting their application in food preservation.The optimal composition of the composite flms was determined through a fuzzy comprehensive evaluation,and the best performance was achieved with 10 g/L of PCP and 1.5 g/L of nano TiO_(2).These composite flms exhibited high mechanical strength,antimicrobial capacity,and antioxidant capacity while being noncytotoxic.The practical effcacy of the composite flms was verifed by applying them to preserve fresh-cut yams at room temperature,where they effectively delayed spoilage and maintained yam quality.This study demonstrates that PMS/KGM/PCP/nano TiO2 composite flms can signifcantly enhance the shelf life of fresh produce,providing a viable route for eco-friendly food preservation.展开更多
AIM： To investigate the apoptotic effect of photoexcited titanium dioxide （TiO2） nanoparticles in the presence of visible light on human hepatoma cell line （Bel 7402） and to study the underlying mechanism. METHOD...AIM： To investigate the apoptotic effect of photoexcited titanium dioxide （TiO2） nanoparticles in the presence of visible light on human hepatoma cell line （Bel 7402） and to study the underlying mechanism. METHODS： Cerium-element-doped titanium dioxide nanoparticles were prepared by impregnation method. Bel 7402 human hepatoma cells were cultured in RPMI 1640 medium in a humidified incubator with 50 mL/L COL at 37℃. A 15 W fluorescent lamp with continuous wavelength light was used as light source in the photocatalytic test. Fluorescence morphology and agarose gel eletrophoresis pattern were performed to analyze apoptotic cells. RESULTS： The Ce （Ⅳ）-doped TiO2 nanoparticles displayed their superiority. The adsorption edge shifted to the 400-450 nm region. With visible light illuminated for 10 min, 10 μg/cm^3 Ce （lV）-doped TiO2 induced micronuclei and significant apoptosis in 4 and 24 h, respectively. Hochest 33 258 staining of the fixed cells revealed typical apoptotic structures （apoptotic bodies）, agarose gel electrophoresis showed typical DNA ladder pattern in treated cells but not in untreated ones. CONCLUSION： Ce （Ⅳ） doped TiO2 nanoparticles can induce apoptosis of Bel 7402 human hepatoma cells in the presence of visible light.展开更多
A kind of new nano composite with ultraviolet （UV） ray resistance and high temperature stability was prepared by in-situ polymerization in low temperature. Polysulfonamide （PSA） was synthesized with 4, 4＇-diamin...A kind of new nano composite with ultraviolet （UV） ray resistance and high temperature stability was prepared by in-situ polymerization in low temperature. Polysulfonamide （PSA） was synthesized with 4, 4＇-diaminodiphenyl sulfone （DDS） and terephthaloyl chloride （TPC） in the common solvent N, N-Dimethyl- -acetamide （DMAc）. Nano filler is a certain nano titanium oxide modified by silicon oxide （TMS）, which plays the role of UV resistance additives. Properties of the novel composite materials were characterized by Atomic Force microscopy （AFM）, thermal gravimetric Analysis （TGA） and Ultraviolet Spectroscopy. AFM had showed the sizes and distributions of TMS particles in the nanocomposite. Ultraviolet Spectroscopy for the nanocomposites showed a large absorption in UV band. TGA showed the decomposition temperature was increased over ten degrees with 0.5% wt TMS for this nanocomposite compared with pure PSA.展开更多
The different investigation has been carried out on the biological activities of titanium dioxide nanoparticle but the effect of this nano product on the antibacterial activity of different antibiotics has not been ye...The different investigation has been carried out on the biological activities of titanium dioxide nanoparticle but the effect of this nano product on the antibacterial activity of different antibiotics has not been yet demonstrated. In this study the nano size TiO2 is synthesized using citric acid and alpha dextrose and the enhancement effect of TiO2 nanoparticle on the antibacterial activity of different antibiotics was evaluated against Methicillin-resistant Staphylococcus aureus (MRSA). During the present study, different concentrations of nano-scale TiO2 were tested to find out the best concentration that can have the most effective antibacterial property against the MRSA culture. Disk diffusion method was used to determine the antibacterial activity of these antibiotics in the absence and presence of sub inhibitory concentration of TiO2 nano particle. A clinical isolate of MRSA, isolated from Intensive Care Unit (ICU) was used as test strain. In the presence of sub-inhibitory concentration of TiO2 nanoparticle (20 μg/disc) the antibacterial activities of all antibiotics have been increased against test strain with minimum 2 mm to maximum 10mm. The highest increase in inhibitory zone for MRSA was observed against pencillin G and amikacin (each 10 mm). Conversely, in case of nalidixic acid, TiO2 nanoparticle showed a Synergic effect on the antibacterial activity of this antibiotic against test strain. These results signify that the TiO2 nanoparticle potentate the antimicrobial action of beta lactums, cephalosporins, aminoglycosides, glycopeptides, macrolids and lincosamides, tetracycline a possible utilization of nano compound in combination effect against MRSA.展开更多
Prochloraz diluents( 450 ×,475 ×,500 ×) were added with different concentrations of nano-titanium dioxide( Ti O2)( 0. 8%,1. 0%) respectively to prepare complex fresh-keeping agents,which were applied in...Prochloraz diluents( 450 ×,475 ×,500 ×) were added with different concentrations of nano-titanium dioxide( Ti O2)( 0. 8%,1. 0%) respectively to prepare complex fresh-keeping agents,which were applied in the refrigeration of Dioscorea alata Lirm. sp. With rot index,weight loss rate,browning degree( BD),total soluble solids( TSS) content,malondialdehyde( MDA) content,polyphenol oxidase( PPO) activity and peroxidase( POD) activity,DPPH· scavenging rate as evaluation indexes,the preservation effect of the prepared freshkeeping agents on D. alata during the cold storage period was analyzed. The results showed that prochloraz added with nano-titanium dioxide significantly prolonged the storage life,reduced the rot rate and weight loss rate,and slowed the loss of pulp of D. alata. The preservation effect of complex fresh-keeping agent of prochloraz diluent( 475 ×) and nano-titanium dioxide( 1. 0%) was better than that of other treatments.展开更多
<span style="font-family:Verdana;">The use of wood has been considered for a long time and to this day, it has a special place in human life. Modification of wood and lignocellulosic materials is done ...<span style="font-family:Verdana;">The use of wood has been considered for a long time and to this day, it has a special place in human life. Modification of wood and lignocellulosic materials is done by various methods, including modification of physical, mechanical, chemical and thermal, that as a new technology, it leads to the improvement of their undesirable features. Among these methods, heat correction is a useful method to improve dimensional stability and leads to increased resistance to water absorption and decay. The main purpose of this study is to investigate the titanium Nano oxide and heat treatment on the physical properties of hornbeam species. Samples were saturated with titanium Nano oxide solution at a concentration of 5000 ppm and pressurized 7 times in a pressure tank. The samples were divided into three groups: control, heat and Nano thermal treatment. Heat and saturated samples with titanium Nano oxide were heat treated at three temperature levels of 150</span><span style="font-family:""><span style="font-family:Verdana;">℃</span><span style="font-family:Verdana;">, 175</span><span style="font-family:Verdana;">℃</span><span style="font-family:Verdana;"> and 200</span><span style="font-family:Verdana;">℃</span><span style="font-family:Verdana;"> for 4 and 6 hours. All three groups underwent physical tests. Heat and Nano thermal oxide treatments led to reduced water absorption and thickness swelling. Comparison between heat and Nano thermal treatment showed a further decrease in water absorption and thickness swelling in Nano thermal samples.展开更多
The objective of this study was to investigate the effect of a new combined micro/nanoscale implant surface feature on osteoblasts＇ behaviors including cell morphology, adhesion, proliferation, differentiation, and m...The objective of this study was to investigate the effect of a new combined micro/nanoscale implant surface feature on osteoblasts＇ behaviors including cell morphology, adhesion, proliferation, differentiation, and mineralization in vitro. A new micro/nano-hybrid topography surface was fabricated on commercial pure titanium（Cp Ti） by a two-step sandblasted acid-etching and subsequent alkali-and heattreatment（SA-AH）. The conventional sandblasted/acid-etching（SA） treatment and alkali and heat（AH） treatment were also carried out on the Cp Ti as controls. Surface microstructures of the Ti disc samples were assessed by scanning electron microscopy（SEM）. The neonatal rat calvaria-derived osteoblasts were seeded on these discs and the initial cell morphology was evaluated by SEM and immunofluorescence. Initial adhesion of the cells was then assayed by DAPI staining at 1, 2, and 4 h after seeding. The Cell Counting Kit-8（CCact K8） assay, gene expression of osteoblastic markers（ALP, Col 1, OCN, BSP, OSX, Cbfα1） and Alizarin Red S staining assays were monitored respectively for cell proliferations, differentiation and mineralization. The results show significant differences in osteoblast＇s behaviors on the four kinds of Ti surfaces. Compared with Cp Ti surface, the SA and AH treatment can significantly promote cell adhesion, differentiation and mineralization of osteoblasts. In particular, the combined SA and AH treatments exhibit synergistic effects in comparison with the treatment of SA and AH individually, and are more favorable for stimulating a series of osteogenous responses from cell adhesion to mineralization of osteoblasts. In summary, this study provides some new evidence that the integrated micro/nanostructure on the Cp Ti surface may promote bone osseointegration between the Ti implantbone interfaces in vitro.展开更多
We put forward a protocolcombining laser treatment and acid etching to obtain multiscale micro/nano-texture surfaces of titanium alloy implant.Firstly,the operationalparameters of the laser were optimized to obtain an...We put forward a protocolcombining laser treatment and acid etching to obtain multiscale micro/nano-texture surfaces of titanium alloy implant.Firstly,the operationalparameters of the laser were optimized to obtain an optimum current.Secondly,the laser with the optimum operationalparameters was used to fabricate micro pits.Thirdly,multiple acid etching was used to clean the clinkers of micro pits and generate submicron and nanoscale structures.Finally,the bioactivity of the samples was measured in a simulated body fluid.The results showed that the micropits with a diameter of 150 μm and depth of 50 μm were built successfully with the optimized working current of 13 A.In addition,submicron and nanoscale structures,with 0.5-2 μm microgrooves and 10-20 nm nanopits,were superimposed on micro pits surface by multiple acid etching.There was thick and dense HA coating only observed on the multiscale micro/nano-textured surface compared with polished and micro-textured surface.This indicated that the multiscale micro/nano-texture surface showed better ability toward HA formation,which increased the bioactivity of implants.展开更多
基金Funded by the Natural Science Foundation of Hebei Province, China (No. E2008000537)the Foundation for Development of Science and Technology of Hebei Province, China (No. 07215156)the Open Research Foundation of Key Laboratory of Advanced Civil Engineering Materials (Tongji University),Ministry of Education, China (No. 2010412)
文摘Electrostatic self-assembly method （ESAM） was used to prepare bentonite supported-nano titanium dioxide photocatalysts. The materials were characterized by X-ray diffraction （XRD）, fourier transform infrared spectroscopy （FT-IR） and scanning electron microscopy （SEM）. Methyl orange was used to estimate the photocatalytic activity of the materials. The effects of the calcination temperature and silane dosage on the photocatalytic activity of the samples were investigated. The experimental results show that the bentonite facilitates the formation of anatase and restrains the transformation of anatase to rutile. Part of nano-size TiO2 particles insert into the galleries of bentonite. The photocatalysts exhibit a synergistic effect of adsorption and photocatalysis on methyl orange. Photocatalysts prepared by ESAM method exhibit higher photocatalytic activity and better recycle ability than those of the traditional method.
基金funded by The Scientific and Technological Research Council of Turkey-TUBITAK[Grant No.219M522].
文摘In this study,the workability of cement-based grouts containing n-TiO 2 nanoparticles and fly ash has been investigated experimentally.Several characteristic quantities(including,but not limited to,the marsh cone flow time,the mini slump spreading diameter and the plate cohesion meter value)have been measured for different percentages of these additives.The use of fly ash as a mineral additive has been found to result in improvements in terms of workability behavior as expected.Moreover,if nano titanium oxide is also used,an improvement can be obtained regarding the bleeding values for the cement-based grout mixes.Using such experimental data,a multi-layer perceptron artificial neural network model has been developed(5 neurons in the hidden layer of the network model have been developed using a total of 42 experimental data).70%of the data employed in this model have been used for training,15%for validation and 15%for the test phase.The results demonstrate that the artificial neural network model can predict Marsh cone flow time,mini slump spreading diameter and plate cohesion meter values with an average error of 0.15%.
基金Supported by Key Scientific and Technological Program of Henan Province (112102310424)
文摘New applications and research progress of nano titanium dioxide （TiO2） in coating, environmental protection, chemical industries, cos- metics industry, electronic industrial products, medicine, health and food processing fields were summarized in the paper. The results showed that nano TiO2 is the most dynamic one in the new nano material study today, which will have a very important impact on our social economic develop- ment in future. The research and utilization will give people＇s lives enormous changes.
文摘Concrete is among the most utilized and essential construction materials in terms of strengthening the structure.The use of natural aggregates can be reduced by using crumb rubber aggregates(RA)as a substitute.The use of RA will reduce the expense on aggregate and help in creating a sustainable environment.Nanoparticles improve the microscopic structure of concrete by filling pores present in cement paste thus reducing the cement usage in the mix.Employing nano titanium dioxide(NT)in rubber concrete(RC)helps to improve its properties.The findings showed that RA significantly alters the characteristics of the concrete;at a 15%level of fine aggregate(FA)replacement,the workability and density of the concrete mixes dropped by up to 26.53%and 5%,respectively.Concrete's compressive,tensile,and flexural strengths decreased by 16.1%,5.52%,and 3.1%,respectively,as a result of adding RA.However,these negative effects were successfully offset by the addition of NT.Even while workability declined,density grew.The research shows that the use of NT in RC composites enhances corrosion resistance and durability,reduces porosity,and improves permeability.The research also suggests that NT helps to smoothen pores and microcracks in concrete,resulting in enhanced resistance to elements such as water and air.This study employs analysis of variance to evaluate the mechanical and durability characteristics of rubberized concrete composites.Microstructural investigation employing field emission scanning electron microscopy examines the interfacial transition zone,hydration products,and pore structure,offering insights into the influence of NT on concrete matrix.This study offers thorough,significant information on the application of NT nanoparticles as a green and efficient additive to enhance concrete performance,and it also presents potential for additional studies in this area of study.
基金supported by the Shenyang Medical College Scientifc Research Innovation Fund(Nos.20182033 and 20191038),China。
文摘Modifed starch flms are gaining attention as biodegradable and sustainable materials in the food packaging industry.However,their inherent properties,including their brittleness and low antimicrobial and antioxidant capacities,limit their extensive application.To address these shortcomings,in this study,a composite flm was developed using potato-modifed starch(PMS)as the base material,enhanced with konjac glucomannan(KGM),Pleurotus citrinopileatus polysaccharide(PCP),and nano titanium dioxide(nano TiO_(2)).Additionally,PCP and nano TiO_(2),which are bioactive components,were incorporated to improve the functional properties of the flms,promoting their application in food preservation.The optimal composition of the composite flms was determined through a fuzzy comprehensive evaluation,and the best performance was achieved with 10 g/L of PCP and 1.5 g/L of nano TiO_(2).These composite flms exhibited high mechanical strength,antimicrobial capacity,and antioxidant capacity while being noncytotoxic.The practical effcacy of the composite flms was verifed by applying them to preserve fresh-cut yams at room temperature,where they effectively delayed spoilage and maintained yam quality.This study demonstrates that PMS/KGM/PCP/nano TiO2 composite flms can signifcantly enhance the shelf life of fresh produce,providing a viable route for eco-friendly food preservation.
文摘AIM： To investigate the apoptotic effect of photoexcited titanium dioxide （TiO2） nanoparticles in the presence of visible light on human hepatoma cell line （Bel 7402） and to study the underlying mechanism. METHODS： Cerium-element-doped titanium dioxide nanoparticles were prepared by impregnation method. Bel 7402 human hepatoma cells were cultured in RPMI 1640 medium in a humidified incubator with 50 mL/L COL at 37℃. A 15 W fluorescent lamp with continuous wavelength light was used as light source in the photocatalytic test. Fluorescence morphology and agarose gel eletrophoresis pattern were performed to analyze apoptotic cells. RESULTS： The Ce （Ⅳ）-doped TiO2 nanoparticles displayed their superiority. The adsorption edge shifted to the 400-450 nm region. With visible light illuminated for 10 min, 10 μg/cm^3 Ce （lV）-doped TiO2 induced micronuclei and significant apoptosis in 4 and 24 h, respectively. Hochest 33 258 staining of the fixed cells revealed typical apoptotic structures （apoptotic bodies）, agarose gel electrophoresis showed typical DNA ladder pattern in treated cells but not in untreated ones. CONCLUSION： Ce （Ⅳ） doped TiO2 nanoparticles can induce apoptosis of Bel 7402 human hepatoma cells in the presence of visible light.
文摘A kind of new nano composite with ultraviolet （UV） ray resistance and high temperature stability was prepared by in-situ polymerization in low temperature. Polysulfonamide （PSA） was synthesized with 4, 4＇-diaminodiphenyl sulfone （DDS） and terephthaloyl chloride （TPC） in the common solvent N, N-Dimethyl- -acetamide （DMAc）. Nano filler is a certain nano titanium oxide modified by silicon oxide （TMS）, which plays the role of UV resistance additives. Properties of the novel composite materials were characterized by Atomic Force microscopy （AFM）, thermal gravimetric Analysis （TGA） and Ultraviolet Spectroscopy. AFM had showed the sizes and distributions of TMS particles in the nanocomposite. Ultraviolet Spectroscopy for the nanocomposites showed a large absorption in UV band. TGA showed the decomposition temperature was increased over ten degrees with 0.5% wt TMS for this nanocomposite compared with pure PSA.
文摘The different investigation has been carried out on the biological activities of titanium dioxide nanoparticle but the effect of this nano product on the antibacterial activity of different antibiotics has not been yet demonstrated. In this study the nano size TiO2 is synthesized using citric acid and alpha dextrose and the enhancement effect of TiO2 nanoparticle on the antibacterial activity of different antibiotics was evaluated against Methicillin-resistant Staphylococcus aureus (MRSA). During the present study, different concentrations of nano-scale TiO2 were tested to find out the best concentration that can have the most effective antibacterial property against the MRSA culture. Disk diffusion method was used to determine the antibacterial activity of these antibiotics in the absence and presence of sub inhibitory concentration of TiO2 nano particle. A clinical isolate of MRSA, isolated from Intensive Care Unit (ICU) was used as test strain. In the presence of sub-inhibitory concentration of TiO2 nanoparticle (20 μg/disc) the antibacterial activities of all antibiotics have been increased against test strain with minimum 2 mm to maximum 10mm. The highest increase in inhibitory zone for MRSA was observed against pencillin G and amikacin (each 10 mm). Conversely, in case of nalidixic acid, TiO2 nanoparticle showed a Synergic effect on the antibacterial activity of this antibiotic against test strain. These results signify that the TiO2 nanoparticle potentate the antimicrobial action of beta lactums, cephalosporins, aminoglycosides, glycopeptides, macrolids and lincosamides, tetracycline a possible utilization of nano compound in combination effect against MRSA.
基金Supported by Natural Science Foundation of Guangxi(2017GXNSFAA198082)Guangxi First-class Discipline Cultivation Project for Food Science and Engineering(GXYLXP1812)
文摘Prochloraz diluents( 450 ×,475 ×,500 ×) were added with different concentrations of nano-titanium dioxide( Ti O2)( 0. 8%,1. 0%) respectively to prepare complex fresh-keeping agents,which were applied in the refrigeration of Dioscorea alata Lirm. sp. With rot index,weight loss rate,browning degree( BD),total soluble solids( TSS) content,malondialdehyde( MDA) content,polyphenol oxidase( PPO) activity and peroxidase( POD) activity,DPPH· scavenging rate as evaluation indexes,the preservation effect of the prepared freshkeeping agents on D. alata during the cold storage period was analyzed. The results showed that prochloraz added with nano-titanium dioxide significantly prolonged the storage life,reduced the rot rate and weight loss rate,and slowed the loss of pulp of D. alata. The preservation effect of complex fresh-keeping agent of prochloraz diluent( 475 ×) and nano-titanium dioxide( 1. 0%) was better than that of other treatments.
文摘<span style="font-family:Verdana;">The use of wood has been considered for a long time and to this day, it has a special place in human life. Modification of wood and lignocellulosic materials is done by various methods, including modification of physical, mechanical, chemical and thermal, that as a new technology, it leads to the improvement of their undesirable features. Among these methods, heat correction is a useful method to improve dimensional stability and leads to increased resistance to water absorption and decay. The main purpose of this study is to investigate the titanium Nano oxide and heat treatment on the physical properties of hornbeam species. Samples were saturated with titanium Nano oxide solution at a concentration of 5000 ppm and pressurized 7 times in a pressure tank. The samples were divided into three groups: control, heat and Nano thermal treatment. Heat and saturated samples with titanium Nano oxide were heat treated at three temperature levels of 150</span><span style="font-family:""><span style="font-family:Verdana;">℃</span><span style="font-family:Verdana;">, 175</span><span style="font-family:Verdana;">℃</span><span style="font-family:Verdana;"> and 200</span><span style="font-family:Verdana;">℃</span><span style="font-family:Verdana;"> for 4 and 6 hours. All three groups underwent physical tests. Heat and Nano thermal oxide treatments led to reduced water absorption and thickness swelling. Comparison between heat and Nano thermal treatment showed a further decrease in water absorption and thickness swelling in Nano thermal samples.
基金Funded by the Natural Science Fundation of Zhejiang Province(Nos.Y2080956 and Y4110169)the National Natural Science Foundation of China(Nos.51102211,and 20934003)the Science and Technique Plans of Wenzhou City(Nos.Y20070093 and H20100076)
文摘The objective of this study was to investigate the effect of a new combined micro/nanoscale implant surface feature on osteoblasts＇ behaviors including cell morphology, adhesion, proliferation, differentiation, and mineralization in vitro. A new micro/nano-hybrid topography surface was fabricated on commercial pure titanium（Cp Ti） by a two-step sandblasted acid-etching and subsequent alkali-and heattreatment（SA-AH）. The conventional sandblasted/acid-etching（SA） treatment and alkali and heat（AH） treatment were also carried out on the Cp Ti as controls. Surface microstructures of the Ti disc samples were assessed by scanning electron microscopy（SEM）. The neonatal rat calvaria-derived osteoblasts were seeded on these discs and the initial cell morphology was evaluated by SEM and immunofluorescence. Initial adhesion of the cells was then assayed by DAPI staining at 1, 2, and 4 h after seeding. The Cell Counting Kit-8（CCact K8） assay, gene expression of osteoblastic markers（ALP, Col 1, OCN, BSP, OSX, Cbfα1） and Alizarin Red S staining assays were monitored respectively for cell proliferations, differentiation and mineralization. The results show significant differences in osteoblast＇s behaviors on the four kinds of Ti surfaces. Compared with Cp Ti surface, the SA and AH treatment can significantly promote cell adhesion, differentiation and mineralization of osteoblasts. In particular, the combined SA and AH treatments exhibit synergistic effects in comparison with the treatment of SA and AH individually, and are more favorable for stimulating a series of osteogenous responses from cell adhesion to mineralization of osteoblasts. In summary, this study provides some new evidence that the integrated micro/nanostructure on the Cp Ti surface may promote bone osseointegration between the Ti implantbone interfaces in vitro.
基金Funded by the National Natural Science Foundation of China(51175306 and 51575320)the Tai Shan Scholar Foundation(TS20130922)the Fundamental Research Funds for the Central Universities(2014JC020)
文摘We put forward a protocolcombining laser treatment and acid etching to obtain multiscale micro/nano-texture surfaces of titanium alloy implant.Firstly,the operationalparameters of the laser were optimized to obtain an optimum current.Secondly,the laser with the optimum operationalparameters was used to fabricate micro pits.Thirdly,multiple acid etching was used to clean the clinkers of micro pits and generate submicron and nanoscale structures.Finally,the bioactivity of the samples was measured in a simulated body fluid.The results showed that the micropits with a diameter of 150 μm and depth of 50 μm were built successfully with the optimized working current of 13 A.In addition,submicron and nanoscale structures,with 0.5-2 μm microgrooves and 10-20 nm nanopits,were superimposed on micro pits surface by multiple acid etching.There was thick and dense HA coating only observed on the multiscale micro/nano-textured surface compared with polished and micro-textured surface.This indicated that the multiscale micro/nano-texture surface showed better ability toward HA formation,which increased the bioactivity of implants.
