Supercooling of the microencapsulated phase change materials（PCMs） during cooling usually happens. This phenomenon can interfere with heat transfer and is necessary to further overcome. In this study, mela- mine-for...Supercooling of the microencapsulated phase change materials（PCMs） during cooling usually happens. This phenomenon can interfere with heat transfer and is necessary to further overcome. In this study, mela- mine-formaldehyde microcapsules containing two n-alkane PCMs, namely, n-dodecane（Cl2） or n-tetradecane（C14） were prepared by in situ polymerization. A small amount of n-hexatriacontane（C36） was introduced as an organic ge- lator into the core of microcapsules to cope with the supercooling problem. Analyses demonstrate that supercooling of the microencapsulated C12 or C14 was significantly suppressed by adding 3%（mass fraction） C36, without changing the spherical morphology and dispersibility. It could be also found that the enthalpy of microencapsulated CI2 or C14 containing C36 was similar to that of microencapsulated n-alkanes without C36, whereas the difference between onsets of crystallization and melting（degree of supercooling） is similar to that of those of pure n-alkanes, suggesting the re- markable suppression ability of the organic gelator on supercooling.展开更多
A liquid crystalline gelator containing the azobenzene chromophore was synthesized for the first time; it was used to form self- assembled network in nematic liquid crystals resulting in liquid crystal gels with disti...A liquid crystalline gelator containing the azobenzene chromophore was synthesized for the first time; it was used to form self- assembled network in nematic liquid crystals resulting in liquid crystal gels with distinct features.展开更多
Natural wax gelators have different compositions of compounds(hydrocarbons,wax esters,free fatty alcohols,and free fatty acids),which results in oleogels with varying properties.To maintain a consistent composition,th...Natural wax gelators have different compositions of compounds(hydrocarbons,wax esters,free fatty alcohols,and free fatty acids),which results in oleogels with varying properties.To maintain a consistent composition,the individual components can be added to the original wax gelator.The content of hydrocarbons and wax esters greatly affects the structuring process of liquid edible oils with waxes.The aim of this study was to evaluate the possibility of modifying the properties of beeswax as a gelling agent by adding hydrocarbons or monoesters to obtain oleogels with specific properties.Various tests were conducted to assess the changes in the oleogel properties,such as color,microstructure,oil-binding capacity,thermal and textural properties.The research results have shown that the addition of the studied fractions has led to a significant change in all properties of oleogels.The initial size of oleogel crystals(7.29±1.80μm)changed after adding fractions,varying from 5.28μm to 12.58μm with hydrocarbons and from 9.95μm to 30.41μm with wax esters.The addition of 30%–50% hydrocarbons decreased the ability of the oleogels to bind oil and made them less firm compared to samples with 10%-20% hydrocarbons.Adding 10%-20% monoesters increased the firmness of the oleogels,but this indicator decreased when their content was increased to 50%.The obtained data indicate that hydrocarbons and wax esters can be used for targeted correction of the gelling properties of beeswax.展开更多
An amphiphilic tetrathiafulvalene molecule was designed and readily synthesized. The am-TTF can gelate a variety of organic solvents in view of multiple intermolecular interactions, especially in polar solvent.SEM obs...An amphiphilic tetrathiafulvalene molecule was designed and readily synthesized. The am-TTF can gelate a variety of organic solvents in view of multiple intermolecular interactions, especially in polar solvent.SEM observation provided clear evidence for the self-assembled micro/nanofibers morphologies in gelation state. Moreover, XRD measurements indicated the formation of highly-ordered columnar structures. The FT-IR spectra revealed that the formation of mixed-valence states with the absorption over 1700 cm^(-1), showing the semiconductive behaviors with the conductivity of 10^(-4)S/cm. The am-TTF based conducting fibers could be promising candidates for organic electronics.展开更多
In order to define the chemical conformation of gelator,para-hydroxy pyridinium salt of 1,2,4,5-benzene tetracarboxylic acid（defined as G1）,four model compounds were prepared from para-,meta-,ortho-phthalic acid wit...In order to define the chemical conformation of gelator,para-hydroxy pyridinium salt of 1,2,4,5-benzene tetracarboxylic acid（defined as G1）,four model compounds were prepared from para-,meta-,ortho-phthalic acid with 4-hydroxy pyridine（PHP）,and 1,2,4,5-benzene tetracarboxylic acid（BTA） with 4-pyridylcarbinol（PCB）,and their 1H NMR spectra were investigated.The single crystal of G1 obtained directly from gelling solvent was measured,which displayed complicated hydrogen-bonded networks arising from the supramolecular synthons and other weak interactions between H20 and the components. The powder X-ray diffraction （XRPD） experiments were also carded out to understand the relationship between molecular packing of the bulk crystal and the gelation behavior.展开更多
1,3:2,4-di-p-methylbenzylidene-D-sorbitol(MDBS)is known to be an efficient sorbitol derivative gelator.Two new sorbitol derivative gelators were designed and synthesized in contrast to MDBS in order to study the gel p...1,3:2,4-di-p-methylbenzylidene-D-sorbitol(MDBS)is known to be an efficient sorbitol derivative gelator.Two new sorbitol derivative gelators were designed and synthesized in contrast to MDBS in order to study the gel properties of gelators with different structures.Their gelation behavior to 30 solvents was investigated.It was found that the gelation behavior was related to the molecular structure of gelators.Compared with MDBS,the gelator with more hydroxyl in the molecular structure could gel water and that with more aromatic ring could gel aromatic solvent.The fibrous and three-dimensional network of the gels was obtained by scanning electron microscopy(SEM).Ultraviolet-visible(UV-Vis)spectroscopy revealed thatπ-πinteraction was one of the main driving forces for the formation of gels.Theπ-πstacking of gelation increases with the number of aromatic rings in the molecular structure of gelator.Fourier transform infrared(FT-IR)spectroscopy revealed that the hydrogen bonding was also the main driving force for the formation of gels.The layered structure of the gels was studied by X-ray diffraction(XRD).展开更多
Hydrogels formed by gelators have attracted growing attention for their promising application in biomaterials and biotechnology, We describe in this paper the generation and characterization of a novel photo-, thermal...Hydrogels formed by gelators have attracted growing attention for their promising application in biomaterials and biotechnology, We describe in this paper the generation and characterization of a novel photo-, thermal- and pH-responsive hydrogel based on an amino acid gelator AA-Azo-EG6. Specifically, the gelator bears an amino acid head, an azobenzene （Azo） linker, and a short oligoethylene glycol tail （EG6）. The resulting AA-Azo-EG6 hydrogel is injectable and exhibits interesting helical self-assembled structures, Meanwhile, the hydrogel is able to experience a gel-sol or gel-precipitate phase transition responding to external stimuli. Thus, this AA-Azo-EG6 gelator is a promising building block for intelligent materials and drug delivery.展开更多
A supramolecular hydrogel （defined as G1） formed from 1,2,4,5-benzene tetracarboxylic acid （BTCA） and 2-amino-3- hydroxypyridine possessed higher Tgel than that of another hydrogel （defined as G2） formed from BT...A supramolecular hydrogel （defined as G1） formed from 1,2,4,5-benzene tetracarboxylic acid （BTCA） and 2-amino-3- hydroxypyridine possessed higher Tgel than that of another hydrogel （defined as G2） formed from BTCA and 3-hydroxypyridine. Based on the analysis of their xerogels by 1H NMR, IR and XRD, the higher stability of G1 was attributed to the formation of stronger hydrogen binding enhanced by the ortho amino group of 2-amino-3-hydroxypyridine.展开更多
Tetrathiafulvalene (TTF) and its derivatives have been intensively investigated for conducting materials for more than 30 years.As π-electron donors,TTF and its derivatives can be reversibly transformed into the resp...Tetrathiafulvalene (TTF) and its derivatives have been intensively investigated for conducting materials for more than 30 years.As π-electron donors,TTF and its derivatives can be reversibly transformed into the respective TTF.+ and TTF2+.Due to its reversible feature,the TTF unit has been widely employed as the building block for switchable systems.In recent years studies of conducting nanostructures of TTF derivatives have received more and more attention.One simple way to prepare nano-structures is through the gelation processes.In this review,we have discussed recent progress in stimuli-responsive gels and conducting nanostructures based on TTF-based gelators.展开更多
A series of p-alkoxylbenzamides featuring a long alkyl chain have been synthesized and are readily to form stable gels in a variety of organic solvents. Their selfassembly properties and structure-property relationshi...A series of p-alkoxylbenzamides featuring a long alkyl chain have been synthesized and are readily to form stable gels in a variety of organic solvents. Their selfassembly properties and structure-property relationship were investigated by scanning electron microscopy, X-ray diffraction, IH nuclear magnetic resonance, and Fourier transform infrared spectroscopy. The gels formed were multi-responsive to environmental stimuli such as temperature and fluoride anion. The results show that a combination of hydrogen bonding, n-n stacking and van der Waals interaction result in the aggregation of palkoxylbenzamides to form three-dimension networks, depending on the length of the long alkyl chain.展开更多
A novel gelator that contained both Schiffbase and L-lysine moieties was synthesized and its gelation behavior was tested. This gelator can form gels in various organic solvents. The resulting gel can be applied as a ...A novel gelator that contained both Schiffbase and L-lysine moieties was synthesized and its gelation behavior was tested. This gelator can form gels in various organic solvents. The resulting gel can be applied as a fascinating platform for visual recognition of enantiomeric 1 -（2-hydroxynaphthalen- 1-yl）naphthalen-2-ol （B1NOL） through selective gel collapse. In addition, the mechanism for the reaction of the gel with chiral BINOL was investigated by scanning electron microscope and 1H nuclear magnetic resonance.展开更多
This article is intended to provide an overview of recent progress in the studies of cholesterol-based low-molecular mass gelators (LMMGs) with unusual properties,in particular,gelation and selective gelation at room ...This article is intended to provide an overview of recent progress in the studies of cholesterol-based low-molecular mass gelators (LMMGs) with unusual properties,in particular,gelation and selective gelation at room temperature,gel emulsions and gel film formation,etc.Potential applications of the LMMGs in spilled oil collection and water purification are briefly presented.展开更多
Hydrogel strain sensors represent an importan development for research into flexible electronics,being able to convert external stimuli into easily monitored electrical signals.However,finding simple and rapid prepara...Hydrogel strain sensors represent an importan development for research into flexible electronics,being able to convert external stimuli into easily monitored electrical signals.However,finding simple and rapid preparation methods,as well as ensuring compatibility between conductive fillers and the polymer matrix are stil the main challenges for conductive hydrogel applications In this work,we utilize MXene to coat liquid metal dro plets that have been broken by ultrasound while incorpo rating cellulose nanofibers to make them stably dispersed Electron paramagnetic resonance spectroscopy revealed that the obtained composite filler could catalyze the releas of additional hydroxyl radicals from ammonium persulfat to enable the rapid gelation of acrylic acid under ambien conditions.This unique property allows for the mold-based fabrication of hydrogels in various shapes,and we also explored the use of microfluidic devices for printing.Th conductive hydrogels showed good tensile properties small hysteresis loops,high self-healing efficiency(97%conductive recovery),and antimicrobial properties.When assembled into flexible sensors,the hydrogel can accu rately monitor body movements with stable repeatability The outstanding characteristics of the hydrogel not only offer a material basis for the development of novel flexibl sensors,but also have the potential for rapid,large-scale and customized preparation through fast gelation.展开更多
The interface problems in zinc-ion batteries severely limit their electrochemical performance,even in hydrogel(HG)electrolyte(HE).Herein,a strategy of reconfiguring the hydrogen bond networks by thermal gelation is pr...The interface problems in zinc-ion batteries severely limit their electrochemical performance,even in hydrogel(HG)electrolyte(HE).Herein,a strategy of reconfiguring the hydrogen bond networks by thermal gelation is proposed to enhance the battery interface stability.The strategy introduces methyl cellulose into acrylamide,which can effectively stabilize the electrode interface and reconstruct the hydrogen bond networks of the electrolyte through its unique thermos-gelation property.Methylcellulose is dissolved by heating and cooled to form gel.This thermal gelation strategy formed hydrogen bonds with a large amount of free water and methyl cellulose,which not only reduced the water activity but also enhanced the intermolecular polymerization network and also promoted the solvation of Zn2+.More importantly,the symmetric batteries with HE-HG hydrogel electrolyte exhibited a long cycling life of 8000 h.The Zn||Zn0.25V2O5(Zn||ZVO)battery displays the low-capacity decay rate for 800 cycles at 1 C at−20°C.The pouch battery maintains a capacity of 255 mAh·g^(−1) after 100 cycles under 2.5 A·g−1 at−20°C.This study provides a new way to enhance the interfacial stability,which helps to realize the scale application of flexible zinc-ion batteries.展开更多
To enhance the gelation activity of steel slag,a calcination process was employed to activate it.The activated steel slag was then utilized as the primary raw material,combined with sodium silicate as the activator,to...To enhance the gelation activity of steel slag,a calcination process was employed to activate it.The activated steel slag was then utilized as the primary raw material,combined with sodium silicate as the activator,to prepare a gel material.The effect of calcination temperature on the physicochemical properties of steel slag and the resulting samples was examined.The chemical composition and microstructure of the steel slag,along with the derived samples,were meticulously examined using advanced analytical techniques such as X-ray diffraction spectroscopy,Fourier transform infrared spectroscopy,and scanning electron microscope analysis.The results show that calcination can significantly enhance the gelation activity of steel slag.The steel slag exhibits its highest gelation activity at the temperature of 600℃.At this temperature,the compressive strength of the material reaches its highest value of 11.7 MPa,while the porosity is at its lowest level of 12.6%.The microstructure of the samples reveals large continuous regions on the surface of the gel material,with minimal surface cracks.展开更多
We have entered the age of renewable energy revolution.Hence,energy-dense all-solid-state lithium metal batteries are now being actively researched as one of the most promising energy storage systems.However,they have...We have entered the age of renewable energy revolution.Hence,energy-dense all-solid-state lithium metal batteries are now being actively researched as one of the most promising energy storage systems.However,they have not yet been a silver bullet due to the dendrite formation and interfacial issue.Here,we introduce the hybrid polymer electrolyte via a novel solvent-free strategy as well as utilize a polymerization and gelation effect of cyanoethyl polyvinyl alcohol to achieve superior electrochemical performance.The hybrid polymer electrolyte,using cyanoethyl polyvinyl alcohol,demonstrates a stable artificial solid electrolyte interface layer,which suppresses the continuous decomposition of Li salts.Importantly,we also present the lithium-graphite composite anode to reach the super-highenergy-density anode materials.Taken together,these advancements represent a significant stride toward addressing the challenges associated with all-solid-state lithium metal batteries.展开更多
New supramolecular hydrogels with the maximal sol-gel transition temperature （Tgel） of 95 ℃ were obtained by using gelators formed from 1,3,5-benzenetricarboxylic acid （BTA） and para-hydroxyl pyridine （PHP） or ...New supramolecular hydrogels with the maximal sol-gel transition temperature （Tgel） of 95 ℃ were obtained by using gelators formed from 1,3,5-benzenetricarboxylic acid （BTA） and para-hydroxyl pyridine （PHP） or meta-hydroxyl pyridine （MHP）. The single crystal structure of the complex formed from BTA and ortho-hydroxyl pyridine （OHP） indicated that the molecules assembled into superstructure via both hydrogen bonds and π--π stacking interaction.展开更多
One of the critical issues in gram-negative bacterial adhesion is how wettability regulates adhesion as the surface wettability varies from superhydrophilic to superhydrophobic,and what is the relevant/contributing ro...One of the critical issues in gram-negative bacterial adhesion is how wettability regulates adhesion as the surface wettability varies from superhydrophilic to superhydrophobic,and what is the relevant/contributing role of the lipopolysaccharide（LPS） outer layer of the gram-negative shell during this procedure.Herein,by avoiding the unexpected influence induced by the varied topographies,control over gram-negative bacteria adhesion by wettability is achieved on biomimetic hierarchical surfaces,which is mainly mediated by LPS layer.The study provides a methodology to have a good control over bacteria cell adhesion by properly designing wettable surface structures.This design concept is helpful for developing new generations of biomaterials in order to control a variety of diseases induced by gramnegative bacteria,which still continue to be very important and necessary in the fields of biomedicine.展开更多
A cholesterol-based organogelator bearing an anthraquinone imide （AQI） group was synthesized and characterized. It self-assembled into chiral gels in acetonitrile at low concentrations, which displayed a combination...A cholesterol-based organogelator bearing an anthraquinone imide （AQI） group was synthesized and characterized. It self-assembled into chiral gels in acetonitrile at low concentrations, which displayed a combination of electrochromic and chiroptical properties. Upon electrochemical reduction at -700 mV, the gel exhibited new absorption bands at around 820 nm corresponding to n＊-z＊ （SOMO---~LUMO） transitions of the radical anion of AQI and strong negative Cotton effects in the same spectral region. With further reduction at -1000 mY, a new CD band with a negative Cotton effect in the range from 500 nm to 800 nm appeared concomitant with the variation of absorption spectrum. Thus, with the use of electrochromic AQI chromophore as a switch-responsive unit and the stable gel of compound N-[3fl-cholest- 5-en-3-yl N-（2-aminoethyl） carbamate] anthraquinone-2,3-dicarboxylic imide as a chiral scaffold, a redox-triggered chiroptical switch operating in visible and near-infrared region was realized.展开更多
文摘Supercooling of the microencapsulated phase change materials（PCMs） during cooling usually happens. This phenomenon can interfere with heat transfer and is necessary to further overcome. In this study, mela- mine-formaldehyde microcapsules containing two n-alkane PCMs, namely, n-dodecane（Cl2） or n-tetradecane（C14） were prepared by in situ polymerization. A small amount of n-hexatriacontane（C36） was introduced as an organic ge- lator into the core of microcapsules to cope with the supercooling problem. Analyses demonstrate that supercooling of the microencapsulated C12 or C14 was significantly suppressed by adding 3%（mass fraction） C36, without changing the spherical morphology and dispersibility. It could be also found that the enthalpy of microencapsulated CI2 or C14 containing C36 was similar to that of microencapsulated n-alkanes without C36, whereas the difference between onsets of crystallization and melting（degree of supercooling） is similar to that of those of pure n-alkanes, suggesting the re- markable suppression ability of the organic gelator on supercooling.
文摘A liquid crystalline gelator containing the azobenzene chromophore was synthesized for the first time; it was used to form self- assembled network in nematic liquid crystals resulting in liquid crystal gels with distinct features.
基金supported by the Russian Science Foundation under grant(Project No.19-16-00113).
文摘Natural wax gelators have different compositions of compounds(hydrocarbons,wax esters,free fatty alcohols,and free fatty acids),which results in oleogels with varying properties.To maintain a consistent composition,the individual components can be added to the original wax gelator.The content of hydrocarbons and wax esters greatly affects the structuring process of liquid edible oils with waxes.The aim of this study was to evaluate the possibility of modifying the properties of beeswax as a gelling agent by adding hydrocarbons or monoesters to obtain oleogels with specific properties.Various tests were conducted to assess the changes in the oleogel properties,such as color,microstructure,oil-binding capacity,thermal and textural properties.The research results have shown that the addition of the studied fractions has led to a significant change in all properties of oleogels.The initial size of oleogel crystals(7.29±1.80μm)changed after adding fractions,varying from 5.28μm to 12.58μm with hydrocarbons and from 9.95μm to 30.41μm with wax esters.The addition of 30%–50% hydrocarbons decreased the ability of the oleogels to bind oil and made them less firm compared to samples with 10%-20% hydrocarbons.Adding 10%-20% monoesters increased the firmness of the oleogels,but this indicator decreased when their content was increased to 50%.The obtained data indicate that hydrocarbons and wax esters can be used for targeted correction of the gelling properties of beeswax.
基金supported by the National Natural Science Foundation of China (No. 61106068)the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education MinistryJilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis (No. 130028831)
文摘An amphiphilic tetrathiafulvalene molecule was designed and readily synthesized. The am-TTF can gelate a variety of organic solvents in view of multiple intermolecular interactions, especially in polar solvent.SEM observation provided clear evidence for the self-assembled micro/nanofibers morphologies in gelation state. Moreover, XRD measurements indicated the formation of highly-ordered columnar structures. The FT-IR spectra revealed that the formation of mixed-valence states with the absorption over 1700 cm^(-1), showing the semiconductive behaviors with the conductivity of 10^(-4)S/cm. The am-TTF based conducting fibers could be promising candidates for organic electronics.
文摘In order to define the chemical conformation of gelator,para-hydroxy pyridinium salt of 1,2,4,5-benzene tetracarboxylic acid（defined as G1）,four model compounds were prepared from para-,meta-,ortho-phthalic acid with 4-hydroxy pyridine（PHP）,and 1,2,4,5-benzene tetracarboxylic acid（BTA） with 4-pyridylcarbinol（PCB）,and their 1H NMR spectra were investigated.The single crystal of G1 obtained directly from gelling solvent was measured,which displayed complicated hydrogen-bonded networks arising from the supramolecular synthons and other weak interactions between H20 and the components. The powder X-ray diffraction （XRPD） experiments were also carded out to understand the relationship between molecular packing of the bulk crystal and the gelation behavior.
基金Supported by National Natural Science Foundation of China(No.21276188)
文摘1,3:2,4-di-p-methylbenzylidene-D-sorbitol(MDBS)is known to be an efficient sorbitol derivative gelator.Two new sorbitol derivative gelators were designed and synthesized in contrast to MDBS in order to study the gel properties of gelators with different structures.Their gelation behavior to 30 solvents was investigated.It was found that the gelation behavior was related to the molecular structure of gelators.Compared with MDBS,the gelator with more hydroxyl in the molecular structure could gel water and that with more aromatic ring could gel aromatic solvent.The fibrous and three-dimensional network of the gels was obtained by scanning electron microscopy(SEM).Ultraviolet-visible(UV-Vis)spectroscopy revealed thatπ-πinteraction was one of the main driving forces for the formation of gels.Theπ-πstacking of gelation increases with the number of aromatic rings in the molecular structure of gelator.Fourier transform infrared(FT-IR)spectroscopy revealed that the hydrogen bonding was also the main driving force for the formation of gels.The layered structure of the gels was studied by X-ray diffraction(XRD).
基金supported by [18_TD$IF]State High-Tech Development Program of China (863 Program, No. 2015AA020941)the National Natural Science Foundation of China(Nos. NSFC21474004 and NSFC21434008)the Youth Thousand-Talents Program of China for support
文摘Hydrogels formed by gelators have attracted growing attention for their promising application in biomaterials and biotechnology, We describe in this paper the generation and characterization of a novel photo-, thermal- and pH-responsive hydrogel based on an amino acid gelator AA-Azo-EG6. Specifically, the gelator bears an amino acid head, an azobenzene （Azo） linker, and a short oligoethylene glycol tail （EG6）. The resulting AA-Azo-EG6 hydrogel is injectable and exhibits interesting helical self-assembled structures, Meanwhile, the hydrogel is able to experience a gel-sol or gel-precipitate phase transition responding to external stimuli. Thus, this AA-Azo-EG6 gelator is a promising building block for intelligent materials and drug delivery.
文摘A supramolecular hydrogel （defined as G1） formed from 1,2,4,5-benzene tetracarboxylic acid （BTCA） and 2-amino-3- hydroxypyridine possessed higher Tgel than that of another hydrogel （defined as G2） formed from BTCA and 3-hydroxypyridine. Based on the analysis of their xerogels by 1H NMR, IR and XRD, the higher stability of G1 was attributed to the formation of stronger hydrogen binding enhanced by the ortho amino group of 2-amino-3-hydroxypyridine.
基金supported by the National Natural Science Foundation of China,the State Basic Program and Chinese Academy of Sciencessupported by the NSFC-DFG joint project (TRR61)
文摘Tetrathiafulvalene (TTF) and its derivatives have been intensively investigated for conducting materials for more than 30 years.As π-electron donors,TTF and its derivatives can be reversibly transformed into the respective TTF.+ and TTF2+.Due to its reversible feature,the TTF unit has been widely employed as the building block for switchable systems.In recent years studies of conducting nanostructures of TTF derivatives have received more and more attention.One simple way to prepare nano-structures is through the gelation processes.In this review,we have discussed recent progress in stimuli-responsive gels and conducting nanostructures based on TTF-based gelators.
文摘A series of p-alkoxylbenzamides featuring a long alkyl chain have been synthesized and are readily to form stable gels in a variety of organic solvents. Their selfassembly properties and structure-property relationship were investigated by scanning electron microscopy, X-ray diffraction, IH nuclear magnetic resonance, and Fourier transform infrared spectroscopy. The gels formed were multi-responsive to environmental stimuli such as temperature and fluoride anion. The results show that a combination of hydrogen bonding, n-n stacking and van der Waals interaction result in the aggregation of palkoxylbenzamides to form three-dimension networks, depending on the length of the long alkyl chain.
基金We greatly appreciate the support of the National Natural Science Foundation of China （Grant Nos. 21272054 and 21502040）, Natural Science Foundation of Hebei Province （B2016205249 and B2016205211）, Youth Top-notch Talent Foundation of the Education Department of Hebei Province （No. BJ2014039）, Science and Technology Research Fund of the Education Department of Hebei Province （No. ZD2015030） and the Startup Foundation of Hebei Normal University （Nos. L2015B08, L2015B09, L2015k02 and L2016Z01）
文摘A novel gelator that contained both Schiffbase and L-lysine moieties was synthesized and its gelation behavior was tested. This gelator can form gels in various organic solvents. The resulting gel can be applied as a fascinating platform for visual recognition of enantiomeric 1 -（2-hydroxynaphthalen- 1-yl）naphthalen-2-ol （B1NOL） through selective gel collapse. In addition, the mechanism for the reaction of the gel with chiral BINOL was investigated by scanning electron microscope and 1H nuclear magnetic resonance.
基金supported by the National High-Tech Research & Devel-opment Program of China (863 Project) (2007AA03Z349)the National Natural Science Foundation of China (20902055,20927001,91027017)the 13115 Project of Shaanxi Province (2010ZDKG-89)
文摘This article is intended to provide an overview of recent progress in the studies of cholesterol-based low-molecular mass gelators (LMMGs) with unusual properties,in particular,gelation and selective gelation at room temperature,gel emulsions and gel film formation,etc.Potential applications of the LMMGs in spilled oil collection and water purification are briefly presented.
基金financially supported by China Scholarship Council program(No.202306380028)the National Natural Science Foundation of China(No.11204097)+3 种基金the Spanish Ministry of Science(Nos.RYC2020-945030119-I and PID2023-151682NA-I00 funded by MCIN/AEI/10.13039/501100011033/and FEDER)Unidades de Excelencia Maria de Maeztu 2021(No.CEX2021-001202-M)the Spanish Ministry of Science,Innovation and Universities(MCIU),State Bureau of Investigation(AIE),the European Regional Development Fund(FEDER)(No.PGC2018-096958-B-I00)the Catalonian Government(No.2021 SGR00646)
文摘Hydrogel strain sensors represent an importan development for research into flexible electronics,being able to convert external stimuli into easily monitored electrical signals.However,finding simple and rapid preparation methods,as well as ensuring compatibility between conductive fillers and the polymer matrix are stil the main challenges for conductive hydrogel applications In this work,we utilize MXene to coat liquid metal dro plets that have been broken by ultrasound while incorpo rating cellulose nanofibers to make them stably dispersed Electron paramagnetic resonance spectroscopy revealed that the obtained composite filler could catalyze the releas of additional hydroxyl radicals from ammonium persulfat to enable the rapid gelation of acrylic acid under ambien conditions.This unique property allows for the mold-based fabrication of hydrogels in various shapes,and we also explored the use of microfluidic devices for printing.Th conductive hydrogels showed good tensile properties small hysteresis loops,high self-healing efficiency(97%conductive recovery),and antimicrobial properties.When assembled into flexible sensors,the hydrogel can accu rately monitor body movements with stable repeatability The outstanding characteristics of the hydrogel not only offer a material basis for the development of novel flexibl sensors,but also have the potential for rapid,large-scale and customized preparation through fast gelation.
基金supported by the National Natural Science Foundation of China(Nos.52322708 and 52441702)Zhengzhou University Young Student Basic Research Projects(PhD students)(No.ZDBJ202512).
文摘The interface problems in zinc-ion batteries severely limit their electrochemical performance,even in hydrogel(HG)electrolyte(HE).Herein,a strategy of reconfiguring the hydrogen bond networks by thermal gelation is proposed to enhance the battery interface stability.The strategy introduces methyl cellulose into acrylamide,which can effectively stabilize the electrode interface and reconstruct the hydrogen bond networks of the electrolyte through its unique thermos-gelation property.Methylcellulose is dissolved by heating and cooled to form gel.This thermal gelation strategy formed hydrogen bonds with a large amount of free water and methyl cellulose,which not only reduced the water activity but also enhanced the intermolecular polymerization network and also promoted the solvation of Zn2+.More importantly,the symmetric batteries with HE-HG hydrogel electrolyte exhibited a long cycling life of 8000 h.The Zn||Zn0.25V2O5(Zn||ZVO)battery displays the low-capacity decay rate for 800 cycles at 1 C at−20°C.The pouch battery maintains a capacity of 255 mAh·g^(−1) after 100 cycles under 2.5 A·g−1 at−20°C.This study provides a new way to enhance the interfacial stability,which helps to realize the scale application of flexible zinc-ion batteries.
基金sponsored by the Natural Science Foundation of Hebei Province(E2022209101 and E2020209038)the Central Government Guides Local Funds for Scientific and Technological Development(236Z7603G).
文摘To enhance the gelation activity of steel slag,a calcination process was employed to activate it.The activated steel slag was then utilized as the primary raw material,combined with sodium silicate as the activator,to prepare a gel material.The effect of calcination temperature on the physicochemical properties of steel slag and the resulting samples was examined.The chemical composition and microstructure of the steel slag,along with the derived samples,were meticulously examined using advanced analytical techniques such as X-ray diffraction spectroscopy,Fourier transform infrared spectroscopy,and scanning electron microscope analysis.The results show that calcination can significantly enhance the gelation activity of steel slag.The steel slag exhibits its highest gelation activity at the temperature of 600℃.At this temperature,the compressive strength of the material reaches its highest value of 11.7 MPa,while the porosity is at its lowest level of 12.6%.The microstructure of the samples reveals large continuous regions on the surface of the gel material,with minimal surface cracks.
基金supported by the Technology Innovation Program(RS-2023-00256202,Development of MLCB design and manufacturing process technology for board mounting)funded by the Ministry of Trade,Industry&Energy(MOTIE,Korea).
文摘We have entered the age of renewable energy revolution.Hence,energy-dense all-solid-state lithium metal batteries are now being actively researched as one of the most promising energy storage systems.However,they have not yet been a silver bullet due to the dendrite formation and interfacial issue.Here,we introduce the hybrid polymer electrolyte via a novel solvent-free strategy as well as utilize a polymerization and gelation effect of cyanoethyl polyvinyl alcohol to achieve superior electrochemical performance.The hybrid polymer electrolyte,using cyanoethyl polyvinyl alcohol,demonstrates a stable artificial solid electrolyte interface layer,which suppresses the continuous decomposition of Li salts.Importantly,we also present the lithium-graphite composite anode to reach the super-highenergy-density anode materials.Taken together,these advancements represent a significant stride toward addressing the challenges associated with all-solid-state lithium metal batteries.
基金support from the National Natural Science Foundation of China(Nos.20574041,20874055)
文摘New supramolecular hydrogels with the maximal sol-gel transition temperature （Tgel） of 95 ℃ were obtained by using gelators formed from 1,3,5-benzenetricarboxylic acid （BTA） and para-hydroxyl pyridine （PHP） or meta-hydroxyl pyridine （MHP）. The single crystal structure of the complex formed from BTA and ortho-hydroxyl pyridine （OHP） indicated that the molecules assembled into superstructure via both hydrogen bonds and π--π stacking interaction.
基金the NSFC(Nos.51273111,51173105,51573092)the National Basic Research Program of China(973 Program,No.2012CB933803)SJTU-UM Collaborative Research Program,the Program for Professor of Special Appointment(Eastern Scholar)at the Shanghai Institutions of Higher Learning
文摘One of the critical issues in gram-negative bacterial adhesion is how wettability regulates adhesion as the surface wettability varies from superhydrophilic to superhydrophobic,and what is the relevant/contributing role of the lipopolysaccharide（LPS） outer layer of the gram-negative shell during this procedure.Herein,by avoiding the unexpected influence induced by the varied topographies,control over gram-negative bacteria adhesion by wettability is achieved on biomimetic hierarchical surfaces,which is mainly mediated by LPS layer.The study provides a methodology to have a good control over bacteria cell adhesion by properly designing wettable surface structures.This design concept is helpful for developing new generations of biomaterials in order to control a variety of diseases induced by gramnegative bacteria,which still continue to be very important and necessary in the fields of biomedicine.
基金financially supported by the National Natural Science Foundation of China(Nos.20674001,20325415, 20834001)the Research Fund for Doctoral Program of Higher Education of MOE of China(No.20060001029)
文摘A cholesterol-based organogelator bearing an anthraquinone imide （AQI） group was synthesized and characterized. It self-assembled into chiral gels in acetonitrile at low concentrations, which displayed a combination of electrochromic and chiroptical properties. Upon electrochemical reduction at -700 mV, the gel exhibited new absorption bands at around 820 nm corresponding to n＊-z＊ （SOMO---~LUMO） transitions of the radical anion of AQI and strong negative Cotton effects in the same spectral region. With further reduction at -1000 mY, a new CD band with a negative Cotton effect in the range from 500 nm to 800 nm appeared concomitant with the variation of absorption spectrum. Thus, with the use of electrochromic AQI chromophore as a switch-responsive unit and the stable gel of compound N-[3fl-cholest- 5-en-3-yl N-（2-aminoethyl） carbamate] anthraquinone-2,3-dicarboxylic imide as a chiral scaffold, a redox-triggered chiroptical switch operating in visible and near-infrared region was realized.
