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Dynamic swelling performance of hydrophobic hydrogels

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Chinese Chemical Letters 2022年第4期33卷 2178-2182页

作者： Hui Guo Junxian Chen ziang wang Hong Lei Guo Wei Hong Xiaolin wang School of Chemical Engineering and Technology Sun Yat-sen UniversityZhuhai 519082China Department of Mechanics and Aerospace Engineering Southern University of Science and TechnologyShenzhen 518055China School of Pharmacy and State Key Laboratory of Quality Research in Chinese Medicine Macao University of Science and TechnologyMacaoChina

Conventional gels manifest monotonous swelling or shrinking performance upon immersing in solvents until reaching an equilibrium state. Recently, we discovered that the “hydrophobic hydrogels” prepared from hydrophobic polymer networks demonstrated dynamic swelling performance without equilibrium states. Upon water immersion, the gels expanded tremendously at the first stage until reaching a swelling peak;subsequently, the gels shrunk at an extremely slow rate. While this phenomenon endows the material with an unusual feature, more efforts are highly demanding for the full understanding of this performance. Herein, we systematically investigate the hydrophobic hydrogels’ swelling kinetics by screening the organic solvent dependence, polymer effect, and temperature impact. It is revealed that the chemical structure of gels greatly influences the swelling kinetics. The higher the networks’ hydrophobicity, the slower the swelling kinetics. Meanwhile, organic solvents demonstrate a limited effect on the dynamic swelling performance. Moreover, higher temperature significantly accelerates the whole volume change process. Based on the swelling performance, we further develop hydrogel-based soft devices with timeprogrammable two-dimensional and three-dimensional shape-shifting performances.

关键词： Hydrophobic hydrogels Swelling kinetics Shape-shifting device Time-dependence Thermodynamically unstable state

Dry-regulated hydrogels with anisotropic mechanical performance and ionic conductivity

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Chinese Chemical Letters 2022年第2期33卷 871-876页

作者： Ping Li Yi Liu ziang wang Xuemei Xiao Guozhe Meng Xiaolin wang Hong-Lei Guo Hui Guo School of Chemical Engineering and Technology Sun Yat-sen UniversityZhuhai 519082China School of Pharmacy and State Key Laboratory of Quality Research in Chinese Medicine Macao University of Science and TechnologyMacaoChina

Nature consists of various soft tissues with well-ordered hierarchical anisotropic structures, which play essential roles in biological systems to exhibit particular functions. Mimicking bio-tissues, synthetic hydrogels with anisotropic structures have received considerable attention in recent years. However, existing approaches to fabricate anisotropic hydrogels often require complicated procedures, which are timeconsuming and labor-demanding. Inspired by the dry-induced crystallization phenomenon, we report a simple yet effective prestretching-drying-swelling method to afford anisotropic crystalline polyvinyl alcohol hydrogels. Owing to the distinct anisotropic microstructure, the hydrogels demonstrate excellent mechanical properties with noticeable directional distinction. It is revealed that both the enhancing of pre-orientation strain and the extending of heating time make the hydrogels with better mechanical properties and more remarkable anisotropicity. Owing to the anisotropically aligned structure, the hydrogels exhibit remarkably differential ionic conductivity: the difference between the parallel and vertical conductivity of the same sample can reach as high as 6.6 times, making the materials possible candidates as nano-conductive materials. We anticipate that this simple yet effective approach may become highly useful for fabricating oriented hydrogels and endow the materials with more promising application prospects in the future.

关键词： Crystalline hydrogels Anisotropicity Dry process Mechanical performance Differential conductivity

Degradation mechanisms and stabilization strategies of ruthenium-based catalysts for OER in the proton exchange membrane water electrolyzer

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Progress in Natural Science:Materials International 2024年第1期34卷 207-222页

作者： Ming Yang Hongxiang Wu Zhaoping Shi Yibo wang Jiahao Yang Jing Ni Pengbo wang Yuqing Cheng ziang wang Meiling Xiao Changpeng Liu Wei Xing Laboratory of Advanced Power Sources Changchun Institute of Applied Chemistry Chinese Academy of Sciences School of Applied Chemistry and Engineering University of Science and Technology of China Jilin Province Key Laboratory of Low Carbon Chemical Power Sources State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences

Designing economical oxygen evolution reaction(OER) electrocatalysts with high activity and long-term stability is essential to promote the scale-up applications of proton exchange membrane water electrolyzer(PEMWE) for hydrogen production. Ruthenium(Ru)-based materials with high intrinsic activity are hailed as the most promising catalysts, but still infeasible for practical application considering their long unresolved poor stability(only dozens of lifespan). Thus, tremendous efforts have been devoted to uncovering the degradation mechanisms and developing stabilization strategies for the Ru-based catalysts. In this review, starting from summarizing the fundamental understanding of deactivation mechanisms, a picture of the stability issue of Ru-based catalysts is proposed, which is followed by a detailed discussion on the recently developed strategies and progress made on enhancing durability. Finally, insights on the prospects for the future development of stable and practical Rubased OER catalysts are provided.

关键词： OER Ru-based catalysts PEMWE Degradation mechanisms Stabilization strategies

A Review of Fibre Reinforced Polymer (FRP) Reinforced Concrete Composite Column Members Modelling and Analysis Techniques

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Journal of Renewable Materials 2022年第12期10卷 3243-3262页

作者： Mahdi Hosseini Bingyu Jian Haitao Li Dong Yang ziang wang Zixian Feng Feng Shen Jian Zhang Rodolfo Lorenzo Ileana Corbi Ottavia Corbi College of Civil Engineering Nanjing Forestry UniversityNanjing210037China Joint International Research Laboratory for Bio-Composite Building Materials and Structures Nanjing Forestry UniversityNanjing210037China Jiangsu Fiber Composite Co LtdYancheng224700China Nantong Shirui Reinforced Plastic Products Co LtdNantong226002China University College London LondonWC1E 6BTUK University of Naples Federico II Via Claudio 21Naples80133Italy

The use of fibre-reinforced polymer(FRP)to confine concrete columns improves the strength and ductility of the columns by reducing passive lateral confinement *** numerical and analytical formulations have been proposed in the literature to describe the compressive behaviour of FRP confined concrete under both monotonic and cyclic ***,the efect of a stress/strain level in the columns has not been well defined because of the lack of well-defined strategies of modeing and oversimplification of the *** paper reviews the existing FRP combinations and the available numerical and analytical methods to determine the effectiveness of the adopted *** effort has been made to examine the usage of FRP materials in column applications in exist-ing building regimes and highlights the possible future scopes to improve the use of FRP confined concrete in civil applications.

关键词： FRP confined concrete column FRP tube FRP jackets CFRP GFRP stress-strain models

Numerical Study on the Behaviour of Hybrid FRPs Reinforced RC Slabs Subjected to Blast Loads

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Journal of Renewable Materials 2023年第9期11卷 3517-3531页

作者： Mahdi Hosseini Bingyu Jian Jian Zhang Haitao Li Rodolfo Lorenzo Ahmad Hosseini Pritam Ghosh Feng Shen Dong Yang ziang wang College of Civil Engineering Nanjing Forestry UniversityNanjing210037China Joint International Research Laboratory for Bio-Composite Building Materials and Structures Nanjing Forestry UniversityNanjing210037China Nantong Shirui Reinforced Plastic Products Co. Ltd.Nantong226002China University College London LondonWC1E 6BTUK Fiber Composite Laboratory Hindustan Institute of Technology and ScienceChennai603103India Jiangsu Fiber Composite Co. Ltd.Yancheng224700China

The safety of civilian and military infrastructure is a concern due to an increase in explosive risks,which has led to a demand for high-strength civil infrastructure with improved energy absorption *** this study,a Finite Element(FE)numerical model was developed to determine the effect of hybrid Fibre Reinforced Polymer(FRP)as a strengthening material on full-scale Reinforced Concrete(RC)*** reinforcing materials under consideration were Carbon(CFRP)and Glass(GFRP)fibres,which were subjected to blast loads to determine the structural response.A laminated composite fabric material model was utilized to model the failure of composite,which facilitates the consideration of strain rate *** damaged area of the laminate is determined in the FE model,and it is in good agreement with the corresponding experimental results in the *** containing different stacking sequences were built to demonstrate their efficiency in resisting blast *** general,the damaged area was reduced when a hybrid reinforcement with CFRP as the top layer was used.

关键词： Composite damage blast load CFRP GFRP finite element analysis on LS-DYNA

Muscle-inspired ion-sensitive hydrogels with highly tunable mechanical performance for versatile industrial applications

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Science China Materials 2022年第1期65卷 229-236页

作者： Ping Li ziang wang Xinxing Lin Xiaolin wang Hui Guo School of Chemical Engineering and Technology Sun Yat-sen UniversityZhuhai 519082China School of Pharmacy and State Key Laboratory of Quality Research in Chinese Medicine Macao University of Science and TechnologyTaipaMacaoChina

Human muscles are notably toughened or softened with specific inorganic *** by this phenomenon,herein we report a simple strategy to endow hydrogels with comparable ion-responsive mechanical properties by treating the gels with different ionic ***-crystalline poly(vinyl alcohol)hydrogels are chosen as examples to illustrate this *** to muscles,the mechanical property of hydrogels demonstrates strong dependence on both the nature and concentration of inorganic *** at the same salt concentration,the hydrogels treated with different ionic solutions manifest a broad-range tunability in rigidity(Young’s modulus from 0.16 to 9.6 MPa),extensibility(elongation ratio from 100% to 570%),and toughness(fracture work from 0.82 to 35 MJm^(-3)).The mechanical property well follows the Hofmeister series,where the“salting-out”salts(kosmotropes)have a more pronounced effect on the reinforcement of the ***,the hydrogels’mechanical performance exhibits a positive correlation with the salt ***,it is revealed both the polymer solubility from amorphous domains and polymer crystallinity from crystalline domains are significantly influenced by the ions,which synergistically contribute to the salt-responsive mechanical *** from this feature,the hydrogels have demonstrated promising industrial applications,including tunable tough engineering soft materials,anti-icing coatings,and soft electronic devices.

关键词： crystalline hydrogels ion-responsive Hofmeister effect mechanical performance conductive hydrogels

Centimeter-Scale Above-Room-Temperature Ferromagnetic Fe_(3)GaTe_(2)Thin Films by Molecular Beam Epitaxy

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Chinese Physics Letters 2024年第10期41卷 119-122页

作者： Taikun wang Yongkang Xu Yu Liu Xingze Dai Pengfei Yan Jin wang Shuanghai wang Yafeng Deng Kun He Caitao Li ziang wang Wenqin Zou Rongji Wen Yufeng Hao Liang He School of Electronic Science and Engineering Nanjing UniversityNanjing 210000China National Key Laboratory of Spintronics Nanjing UniversitySuzhou 215163China Department of Physics Nanjing UniversityNanjing 210000China College of Engineering and Applied Science Nanjing UniversityNanjing 210000China

Fe_(3)GaTe_(2),as a layered ferromagnetic material,has a Curie temperature(T_(c))higher than room temperature,making it the key material in next-generation spintronic *** be used in practical devices,large-sized high-quality Fe_(3)GaTe_(2)thin films need to be ***,the centimeter-scale thin film samples with high crystal quality and above-room-temperature ferromagnetism with strong perpendicular magnetic anisotropy were prepared by molecular beam epitaxy ***,the Tc of the samples raises as the film thickness increases,and reaches 367K when the film thickness is 60 *** study provides material foundations for the new generation of van der Waals spintronic devices and paves the way for the commercial application of Fe_(3)GaTe_(2).

关键词： Epitaxy film magnetic

有机半导体图案化成膜中的马兰戈尼与咖啡环效应协同作用

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物理化学学报 2019年第11期35卷 1259-1266页

作者：王子昂郭航荣欣董桂芳清华大学化学系有机光电子与分子工程教育部重点实验室北京100084 清华大学柔性电子技术研究中心北京100084

有机场效应晶体管在柔性传感和显示驱动应用中展示出极大的潜力,但在大面积制备高性能有机薄膜及有机场效应晶体管方面仍面临大的挑战。本文介绍了一种利用等离子处理和马兰戈尼-咖啡环效应协同作用来图案化生长有机半导体薄膜的方法。... 详细信息

有机场效应晶体管在柔性传感和显示驱动应用中展示出极大的潜力,但在大面积制备高性能有机薄膜及有机场效应晶体管方面仍面临大的挑战。本文介绍了一种利用等离子处理和马兰戈尼-咖啡环效应协同作用来图案化生长有机半导体薄膜的方法。经过对等离子体处理时间、混合溶剂的比例及溶液浓度等生长条件优化,在5 cm×5 cm的基片上得到了覆盖性较为完整的2,7-二辛基[1]苯并噻吩并[3,2-b]苯并噻吩(C8-BTBT)薄膜阵列。基于此薄膜构筑了底栅顶接触晶体管阵列,器件的平均迁移率达到7.9 cm2·V-1·s-1,阈值电压均小于-2 V,开关电流比大于104。本工作对未来大面积制备高性能有机半导体薄膜及晶体管具有一定的借鉴意义。

关键词：马兰戈尼效应 C8-BTBT 有机半导体场效应晶体管图案化工艺

普通肝素对高迁移率族蛋白B1介导血管内皮钙黏蛋白表达的影响

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中华危重病急救医学 2019年第7期31卷 842-846页

作者：王子昂孟玉栾正刚中国医科大学附属第一医院重症医学科辽宁沈阳110001 中国医科大学塔城医院重症医学科新疆维吾尔自治区塔城834700

目的观察高迁移率族蛋白B1(HMGB1)对人脐静脉内皮细胞(HUVEC)屏障通透性的损伤及普通肝素(UFH)的保护作用,探讨UFH对HMGB1介导的血管内皮钙黏蛋白(VE-cadherin)表达下调的保护机制.方法体外培养HUVEC并传代,待细胞融合生长至80%时随机分... 详细信息

目的观察高迁移率族蛋白B1(HMGB1)对人脐静脉内皮细胞(HUVEC)屏障通透性的损伤及普通肝素(UFH)的保护作用,探讨UFH对HMGB1介导的血管内皮钙黏蛋白(VE-cadherin)表达下调的保护机制.方法体外培养HUVEC并传代,待细胞融合生长至80%时随机分为4组:磷酸盐缓冲液(PBS)对照组(200 μL PBS)、重组人高迁移率族蛋白B1(rhHMGB1)处理组(100 μg/L rhHMGB1)、UFH对照组(10 kU/L UFH)、UFH预处理组(10 kU/L UFH+100 μg/L rhHMGB1).各组细胞经不同处理24 h后,采用四甲基偶氮唑盐(MTT)比色法测定内皮细胞活性,采用Transwell法测定内皮细胞通透性,采用免疫荧光法观察VE-cadherin的表达及分布,采用蛋白质免疫印迹试验(Western Blot)测定VE-cadherin及磷酸化p38丝裂素活化蛋白激酶(p-p38MAPK)的蛋白表达.结果经100 μg/L的rhHMGB1处理24 h后,内皮细胞活性与PBS对照组差异无统计学意义(A值:0.230±0.004比0.255±0.006,P>0.05),但内皮细胞通透性显著升高(葡聚糖FD40荧光强度:11.05±0.12比6.34±0.39,P<0.05);与PBS对照组比较,荧光显微镜下显示rhHMGB1处理组VE-cadherin膜定位减少,分布松散,细胞间出现明显裂隙,定量分析显示VE-cadherin蛋白表达明显下降(VE-cadherin/β-actin:0.16±0.04比0.31±0.03,P<0.05),p-p38MAPK蛋白表达明显升高(p-p38MAPK/β-actin:0.79±0.03比0.26±0.05,P<0.05).UFH预处理可对HMGB1介导的内皮细胞损伤起保护作用,表现为细胞通透性明显降低(葡聚糖FD40荧光强度:9.11±0.23比11.05±0.12),VE-cadherin荧光表达明显增强,膜定位明显增加,定量分析显示VE-cadherin的蛋白表达明显上调(VE-cadherin/β-actin :0.24±0.02比0.16±0.04),且p38MAPK的磷酸化水平明显降低(p-p38MAPK/β-actin :0.54±0.05比0.79±0.03),与rhHMGB1处理组比较差异均有统计学意义(均P<0.05).PBS对照组与UFH对照组各项指标比较差异均无统计学意义.结论 UFH可保护HMGB1所致的VE-cadherin表达减少和分布异常,进而保护内皮细胞屏障通透性,其作用机制可能与UFH抑制p38MAPK的磷酸化相关.

关键词：脓毒症高迁移率族蛋白B1 普通肝素血管内皮钙黏蛋白