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Highly Flexible and Broad‑Range Mechanically Tunable All‑Wood Hydrogels with Nanoscale Channels via the Hofmeister effect for Human Motion Monitoring

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Nano-Micro Letters 2022年第5期14卷 192-205页

作者： Guihua Yan Shuaiming He Gaofeng Chen Sen Ma Anqi Zeng Binglin Chen Shuliang Yang Xing Tang Yong Sun Feng Xu Lu Lin Xianhai Zeng College of Energy Xiamen UniversityXiamen 361102People’s Republic of China State Key Laboratory of Pulp and Paper‑Making Engineering South China University of TechnologyGuangzhou 510640People’s Republic of China Beijing Key Laboratory of Lignocellulosic Chemistry Beijing Forestry UniversityNo.35Tsinghua East RoadHaidianBeijing 100083People’s Republic of China

Wood-based hydrogel with a unique anisotropic structure is an attractive soft material,but the presence of rigid crystalline cellulose in natural wood makes the hydrogel less flexible.In this study,an all-wood hydrogel was constructed by cross-linking cellulose fibers,polyvinyl alcohol(PVA)chains,and lignin molecules through the Hofmeister effect.The all-wood hydrogel shows a high tensile strength of 36.5 MPa and a strain up to~438%in the longitudinal direction,which is much higher than its tensile strength(~2.6 MPa)and strain(~198%)in the radial direction,respectively.The high mechanical strength of all-wood hydrogels is mainly attributed to the strong hydrogen bonding,physical entanglement,and van der Waals forces between lignin molecules,cellulose nanofibers,and PVA chains.Thanks to its excellent flexibility,good conductivity,and sensitivity,the all-wood hydrogel can accurately distinguish diverse macroscale or subtle human movements,including finger flexion,pulse,and swallowing behavior.In particular,when“An Qi”was called four times within 15 s,two variations of the pronunciation could be identified.With recyclable,biodegradable,and adjustable mechanical properties,the all-wood hydrogel is a multifunctional soft material with promising applications,such as human motion monitoring,tissue engineering,and robotics materials.

关键词： Wood hydrogel Hofmeister effect Tunable mechanical strength Flexible Biodegradable

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Hofmeister effect on Thermo-responsive Poly(N-isopropylacrylamide)Hydrogels Grafted on Macroporous Poly(vinyl alcohol) Formaldehyde Sponges

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Chinese Journal of Polymer Science 2020年第3期38卷 257-267,I0006页

作者： Kai Shi Di Sha Jiu-Duo Xu Xu Yang Bao-Long Wang Yan-Xiong Pan Xiang-Ling Ji State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China University of Chinese Academy of Sciences Beijing 100049China

In this work,the Hofmeister effects of nine kinds of anions at different concentrations on the lower critical solution temperature(LCST)of the macroporous thermo-responsive poly(N-isopropylacrylamide)grafted poly(vinyl alcohol)formaldehyde(PVF-g-PNIPAM)hydrogels are investigated with differential scanning calorimetry(DSC).Four kinds of anions with strong hydration,including CO3^2–,SO4^2–,S2 O3^2–,and F^–,and four kinds of anions with weak hydration,including Br^–,NO3^–,I^–,and ClO4^–,and Cl^–as a medium anion are systematically studied and found to demonstrate the effects of the residual hydroxyl groups and network structure of PVF on the LCST values of PVF-g-PNIPAM hydrogels in comparison with that of neat PNIPAM.On the one hand,the existence of hydroxyl groups on PVF backbone promotes the solubility of grafted PNIPAM due to their hydrophilicity and hydrogen-bond interactions with water.On the other hand,the network structure of as-prepared samples restricts free movements of grafted PNIPAM chains,which results in the increase of LCST values.In addition,the difference of grafting percentage also influences the variation of LCST values of PVF-g-PNIPAM hydrogels under salt concentration.

关键词： Hofmeister effect Thermo-responsive PVF-g-PNIPAM Hydroxyl groups Network structure

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Hofmeister effect-Assisted Strong Natural Biopolymer-Based Hydrogels with Multi-Functions

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Chinese Journal of Chemistry 2021年第11期39卷 3085-3092页

作者： Yaqian Cai Jiachuan Shi Fangzhe Liu Haichao Li Xinya Man Shuang Guan Department of Polymeric and Soft Materials Laboratory School of Chemistry and Life Science and Advanced Institute of Materials ScienceChangchun University of TechnologyChangchunJilin130012 China

Natural biopolymer-based hydrogels have been extensively studied in recent years due to their excellent biocompatibility.However,the preparation of multi-functional and tough natural biopolymer-based hydrogels is still a challenging problem.Herein,a natural biopolymer-based hydrogel is prepared using gelatin and carboxymethyl chitosan(CMCS)through a one-step soaking method.The prepared hydrogel without any synthetic polymers and crosslinking agents has a fully physical crosslinking structure.Due to the hydrophobic interaction brought by the Hofmeister effect,the mechanical properties of soaked hydrogels(tensile stress and strain can reach 3.77 MPa and 1082%)are superior to conventional protein hydrogels.In addition,the prepared gelatin/carboxymethyl chitosan(Gel/CMCS)hydrogels exhibit a variety of appealing properties,including good shape memory,fatigue resistance,electrical conductivity,water retention,drug releasing,antibacterial property,and recyclability.This strategy opens up a new horizon to fabricate hydrogels with excellent mechanical properties and multiple functions,which can extend their applications in the biomedicine area and other related fields.

关键词： Natural biopolymer-based hydrogels Mechanical properties Polymers Hofmeister effect Multi-Fuctions

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Improving physical properties of poly(vinyl alcohol)/montmorillonite nanocomposite hydrogels via the Hofmeister effect

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Chinese Physics B 2023年第8期32卷 6-14页

作者：郭蓉蓉余德帅黄一帆王森付聪朱水洪易佳王涵淇林友辉 Department of Physics Research Institute for Biomimetics and Soft MatterFujian Provincial Key Laboratory for Soft Functional Materials ResearchXiamen UniversityXiamen 361005China National Institute for Data Science in Health and Medicine Xiamen UniversityXiamen 361102China

Hydrogel is a kind of three-dimensional crosslinked polymer material with high moisture content.However,due to the network defects of polymer gels,traditional hydrogels are usually brittle and fragile,which limits their practical applications.Herein,we present a Hofmeister effect-aided facile strategy to prepare high-performance poly(vinyl alcohol)/montmorillonite nanocomposite hydrogels.Layered montmorillonite nanosheets can not only serve as crosslinking agents to enhance the mechanical properties of the hydrogel but also promote the ion conduction.More importantly,based on the Hofmeister effect,the presence of(NH_(4))_(2)SO_(4)can endow nanocomposite hydrogels with excellent mechanical properties by affecting PVA chains'aggregation state and crystallinity.As a result,the as-prepared nanocomposite hydrogels possess unique physical properties,including robust mechanical and electrical properties.The as-prepared hydrogels can be further assembled into a high-performance flexible sensor,which can sensitively detect large-scale and small-scale human activities.The simple design concept of this work is believed to provide a new prospect for developing robust nanocomposite hydrogels and flexible devices in the future.

关键词： nanocomposite hydrogels Hofmeister effect network structure poly(vinyl alcohol) montmorillonite

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Specific ion effect of H^(+) on variably charged soil colloid aggregation

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Pedosphere 2020年第6期30卷 844-852页

作者： Yekun ZHANG Rui TIAN Jia TANG Hang LI Chongqing Key Laboratory of Soil Multi-Scale Interfacial Process College of Resources and EnvironmentSouthwest UniversityChongqing 400715China

Specific ion effects(Hofmeister effects)have recently attracted the attention of soil scientists,and it has been found that ionic non-classic polarization plays an important role in the specific ion effect in soil.However,this explanation cannot be applied to H+.The aim of this work was to characterize the specific ion effect of H+on variably charged soil(yellow soil)colloid aggregation.The total average aggregation(TAA)rate,critical coagulation concentration(CCC),activation energy,and zeta potential were used to characterize and compare the specific ion effects of H+,K+,and Na+.Results showed that strong specific ion effects of H+,K+,and Na+existed in variably charged soil colloid aggregation.The TAA rate,CCC,and activation energy were sensitive to H+,and the addition of a small amount of H+changed the TAA rate,CCC,and activation energy markedly.The zeta potential results indicated that the specific ion effects of H+,K+,and Na+on soil colloid aggregation were caused by the specific ion effects of H+,K+,and Na+on the soil electric field strength.In addition,the origin of the specific ion effect for H+was its chemical adsorption onto surfaces,while those for alkali cations were non-classic polarization.This study indicated that H+,which occurs naturally in variably charged soils,will dominate variably charged soil colloid aggregation.

关键词： activation energy chemical adsorption critical coagulation concentration dynamic light scattering Hofmeister effect total average aggregation rate zeta potential

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A theoretical exploration of the influencing factors for surface potential

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Chinese Physics B 2015年第6期24卷 629-636页

作者：刘新敏杨刚李航田锐李睿丁武泉袁若 Chongqing Key Laboratory of Soil Multi-scale Interfacial Process College of Resources and EnvironmentSouthwest University School of Chemistry and Chemical Engineering Southwest University

Although it has been widely used to probe the interracial property, dynamics, and reactivity, the surface potential remains intractable for directly being measured, especially for charged particles in aqueous solutions. This paper presents that the surface potential is strongly dependent on the Hofmeister effect, and the theory including ion polarization and ionic correlation shows significant improvement compared with the classical theory. Ion polarization causes a strong Hofmeister effect and further dramatic decrease to surface potential, especially at low concentration; in contrast, ionic correlation that is closely associated with potential decay distance overestimates surface potential and plays an increasing role at higher ionic concentrations. Contributions of ion polarization and ionic correlation are respectively assessed, and a critical point is detected where their contributions can be exactly counteracted. Ionic correlation can be almost neglected at low ionic concentrations, while ion polarization, albeit less important at high concentrations, should be considered across the entire concentration range. The results thus obtained are applicable to other interfacial processes.

关键词： Hofmeister effect ionic activity interfacial process potential distribution

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Salt Specific Interaction Between Representativehofmeister Salts and Glycine

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光谱学与光谱分析 2020年第S01期40卷 235-236页

作者： Hamad Ashraf GUO Ya-xin ZHANG Yun-hong The Institute of Chemical Physics School of Chemistry and Chemical EngineeringBeijing Institute of TechnologyBeijing 100081China

Traditionally,Hofmeister effect was understood on the basis of hydration abilities of ions.Recent studies found short-range structuring effects of ions on water which shifted the attention from ion-water interaction to ion-protein interaction.In this study,ATR-FTIR spectroscopy at different RH is used to study the effect of a representative Kosmotrope(MgSO4),Chaotrope(NH4NO3)and neutral(KCl)salt on glycine.The salting out,salting in and neutral effects of salts on glycine are found aligned with Hofmeister effect.Interestingly,direct interaction of kosmotrope anion(SO2-4)with the glycine is observed experimentally which validates the recent idea of ion-protein interaction.Further detailed studies will be needed for deeper insight.

关键词： Hofmeister effect Ion-protein interaction

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胡敏酸(HA)胶体凝聚中的离子特异性效应

胡敏酸(HA)胶体凝聚中的离子特异性效应

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2019年中国土壤学会土壤环境专业委员会、土壤化学专业委员会联合学术研讨会

作者：张烨坤李航土壤多尺度界面与过程调控重庆市重点实验室西南大学资源环境学院

胡敏酸(Humic Acid,HA)是土壤腐殖质的重要组分之一,其胶体的凝聚与分散影响着环境中重金属离子的吸附、迁移等过程。研究表明,HA胶体的凝聚过程中存在显著的离子特异性效应,然而其作用机理仍不明确。因此,本文采用动态光散射等技术系... 详细信息

胡敏酸(Humic Acid,HA)是土壤腐殖质的重要组分之一,其胶体的凝聚与分散影响着环境中重金属离子的吸附、迁移等过程。研究表明,HA胶体的凝聚过程中存在显著的离子特异性效应,然而其作用机理仍不明确。因此,本文采用动态光散射等技术系统研究了HA胶体凝聚中的离子特异性效应。结果表明:1)一价金属离子K+、Cs+可以降低HA颗粒的Zeta电位,但不能引发HA颗粒凝聚;二价金属离子可以通过与HA表面

关键词： DLS Zeta电位重金属离子 Hofmeister effect 非经典极化作用

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Salt Specific Interaction Between Representative hofmeister Salts and Glycine

Salt Specific Interaction Between Representative Hofmeister ...

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第21届全国分子光谱学学术会议暨2020年光谱年会

作者： Hamad Ashraf GUO Ya-xin ZHANG Yun-hong The Institute of Chemical Physics School of Chemistry and Chemical EngineeringBeijing Institute of Technology

Traditionally,Hofmeister effect was understood on the basis of hydration abilities of ions.Recent studies found short-range structuring effects of ions on water which shifted the attention from ion-water interaction to ion-protein interaction.In this study,ATR-FTIR spectroscopy at different RH is used to study the effect of a representative Kosmotrope(MgSO),Chaotrope(NH NO) and neutral(KCl) salt on glycine.The salting out,salting in and neutral effects of salts on glycine are found aligned with Hofmeister effect.Interestingly,direct interaction of kosmotrope anion(SO) with the glycine is observed experimentally which validates the recent idea of ion-protein interaction.Further detailed studies will be needed for deeper insight.

关键词： Hofmeister effect Ion-protein interaction

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