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Force-dependent unfolding and folding dynamics of protein alpha-catenin modulation domains

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Journal of Innovative Optical Health Sciences 2019年第1期12卷 22-28页

作者： Xueping Li Weili Zhai Zilong Guo Hu Chen research Institute for Biomimetics and soft Matter fujian provincial key Lab for soft functional materials research department of physics Xiamen UniversityXiamenChina

α-catenin is an adhesion protein located at the cadherin-based cell-cell adherens junction.α-catenin cross-linksβ-catenin and actin fiber in the adhesion protein complex,and plays an important role in the formation and modulation of cell-cell *** central modulation domains can be unfolded to expose binding site of vinculin when stretching force is ***,we studied the force-induced unfolding dynamics ofα-catenin modulation domains under different loading rates from which the unfolding distance of M2 and M3 domains is determined to be 5-7 nm,and an unfolding intermediate state is *** also found that the folding process of M1-M3 domains goes through different pathways with cooperativity.

关键词： α-catenin folding and unfolding magnetic tweezer Bell's model

Tensile properties of structural I clathrate hydrates:Role of guest-host hydrogen bonding ability

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Frontiers of physics 2021年第3期16卷 125-134页

作者： Yue Xin Qiao Shi Ke Xu Zhi-Sen Zhang Jian-Yang Wu department of physics Research Institute for Biomimetics and Soft MatterJiujiang Research Institute and Fujian Provincial Key Laboratory for Soft Functional Materials ResearchXiamen UniversityXiamen361005China

Clathrate hydrates(CHs)are one of the most promising molecular structures in applications of gas capture and storage,and gas *** knowledge of mechanical characteristics of CHs is of crucial importance for assessing gas storage and separations at cold conditions,as well as understanding their stability and formation ***,the tensile mechanical properties of structural I CHs encapsulating a variety of guest species(CH_(4),NH_(3),H_(2)S,CH_(2)O,CH_(3)OH,and CH_(3)SH)that have different abilities to form hydrogen(H-)bonds with water molecule are explored by classical molecular dynamics(MD)*** investigated CHs are structurally stable clathrate *** mechanical properties of CHs including tensile limit and Young’s modulus are dominated by the H-bonding ability of host-guest molecules and the guest molecular *** containing small CH_(4),CH_(2)O and H_(2)S guest molecules that possess weak H-bonding ability are mechanically robust clathrate structures and mechanically destabilized via brittle failure on the(101)***,those entrapping CH3SH,CH3OH,and NH3 that have strong H-bonding ability are mechanically weak molecular structures and mechanically destabilized through ductile failure as a result of gradual global dissociation of clathrate cages.

关键词： mechanical properties clathrate hydrates hydrogen bonding

A hint from phosphine complex: The π back-bonding in cobalt-phosphorene composite enables enhanced electrocatalytic performance

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Progress in Natural Science:materials International 2023年第1期33卷 100-107页

作者： Xingyun Li Liangping Xiao Hao Wang Jingting Song Qingchi Xu Meidan Ye Jun Xu Shenzhen research Institute of Xiamen University department of physics Research Institute for Biomimetics and Soft Matter Fujian Provincial Key Laboratory for Soft Functional Materials Xiamen University Jiujiang research Institute of Xiamen University department of Chemistry National University of Singapore

Regulating the electronic structure of the metal electrocatalyst is fundamental for its performance optimizing. The electronic states of the active metal centers are highly dependent on their coordination environment, especially when bonding is formed. The π back-bonding can induce great electron density redistribution around metals, yet it is barely applied in electrocatalyst design. Herein we electrodeposited metallic cobalt on black phosphorus(BP)nanosheets, forming BP-Co with a unique π back-bonding on the interfaces. The BP-Co exhibited high electrocatalytic activity and stability for hydrogen evolution reaction in alkaline electrolyte. The electrochemical and spectroscopic characterizations demonstrated that the BP acted as σ donor and π acceptor to coordinate with electron-rich metallic Co, similar to the phosphine complex. The directional σ bond strengthen the relationship between BP and Co, while the non-directional π bond accelerated the in-plane electron transfer. The π back donation also decreased the oxophilicity of Co to make BP-Co resist the poison from oxygen species. This study can intrigue new thinking prospective for the electrocatalyst design.

关键词： Black phosphorus Pi back-bonding Electrocatalyst Electrodeposition Electronic structure

Pressure-driven membrane inflation through nanopores on the cell wall

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Chinese physics B 2023年第8期32卷 15-24页

作者：钟祺吴晨旭马锐 department of physics College of Physical Science and TechnologyXiamen UniversityXiamen 361005China fujian provincial key laboratory for soft functional materials research Research Institute for Biomimetics and Soft MatterXiamen UniversityXiamen 361005China

Walled cells,such as in plants and fungi,compose an important part of the model systems in *** cell wall primarily prevents the cell from over-expansion when exposed to water,and is a porous material distributed with nanosized pores on *** this paper,we study the deformation of a membrane patch by an osmotic pressure through a nanopore on the cell *** find that there exists a critical pore size or a critical pressure beyond which the membrane cannot stand against the pressure and would inflate out through the pore and further *** critical pore size scales linearly with the membrane tension and quadratically with the spontaneous *** critical pressure is inversely proportional to the pore *** results also show that the fluid membrane expansion by pressure is mechanically different from the solid balloon expansion,and predict that the bending rigidity of the membrane in walled cells should be much larger than that of the mammalian cells so as to prevent membrane inflation through the pores on the cell wall.

关键词： membrane mechanics endocytosis osmotic pressure nanopores

Graphene-supported biomimetic catalysts with synergistic effect of adsorption and degradation for efficient dye capture and removal

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Chinese Chemical Letters 2020年第1期31卷 239-243页

作者： Qin Li Xiaopei Wang Xueqing Xiong Shuihong Zhu Zhaohui Meng Yongying Hong Changxu Lin Xiangyang Liu Youhui Lin research Institute for Biomimetics and soft Matter Department of PhysicsFujian Provincial Key Laboratory for Soft Functional Materials ResearchXiamen UniversityXiamen 361005China department of physics National University of SingaporeSingapore 117542Singapore

Design and development of iron porphyrin-based artificial enzymes system have been attracting a lot of ***,without any toxic reductant and harsh processing,we present a facile one-pot method to fabricate bifunctional catalytic nanocomposites consisting of graphene and hemin by using vitamin C as a mild reduction *** presence of graphene helps the formation of a high degree of highly active and stable hemin on the graphene surface in a monomeric form through theirπ-πstacking *** a result,such nanocomposites possess a superior adsorption capacity and intrinsic peroxidase-like catalytic ***,by the combination of their dye adsorption ability,RGOhemin nanocomposites can serve as a suitable candidate for efficient capture and removal of dyes via a synergistic *** findings may pave the way to apply graphene-supported artificial enzymes in a variety of fields,such as environmental chemistry,bionics,medicine,and biotechnology.

关键词： Nanozymes Pollutant removal Solid matrix Supported catalyst Synergistic effect

A robust Janus bilayer with tailored ionic conductivity and interface stability for stable Li metal anodes

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Journal of Energy Chemistry 2022年第11期31卷 368-375,I0010页

作者： Guodong Zhang Pengwei Li Kai Chen Hongfei Zheng Wei He Liangping Xiao Xingyun Li Qingchi Xu Jian Weng Jun Xu department of Biomaterials College of MaterialsXiamen UniversityXiamen 361005FujianChina bdepartment of physics Research Institute for Biomimetics and Soft MatterFujian Provincial Key Laboratory for Soft Functional MaterialsXiamen UniversityXiamen 361005FujianChina Shenzhen research Institute of Xiamen University Shenzhen 518057GuangdongChina

The formation and growth of Li-dendrites caused by inhomogeneous Li deposition severely hinder the commercial applications of Li metal batteries due to the consequence of ***,we propose a Janus bilayer composed of black phosphorus(BP)and graphene oxide(GO)as an artificial interface with chemical/mechanical stability and well-regulated Li-ion flux distribution for Li metal anode *** to the synergy between the fast Li-ion transport of BP in the inner layer and the high mechanical and chemical stability of GO in the outer layer,the GO/BP with good electrolyte wettability acts as a Li-ion regulator that can induce homogeneous growth of Li to suppress the Li dendrites ***,long-term stability(500 h at 1 mA cm^(-2))with a low overpotential of 30 mV is achieved in the symmetric cell with GO/BP-Li ***,the Li–S cell with GO/BP-Li exhibits enhanced cycling performance with a high capacity retention rate of 76.2%over 500 cycles at 1 C.

关键词： Graphene oxide(GO) Black phosphorus(BP) Artificial interface Janus bilayer Li metal batteries

Fracture mechanics of methane clathrate hydrates

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Acta Mechanica Sinica 2021年第9期37卷 1387-1394,I0002页

作者： Jinjie Liu Ke Xu Li Yang Yanwen Lin Tong Li Xuezheng Gao Zhisen Zhang Jianyang Wu department of physics Research Institute for Biomimetics and Soft MatterJiujiang Research Institute and Fujian Provincial Key Laboratory for Soft Functional Materials ResearchXiamen UniversityXiamen361005China key laboratory of Marine materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective TechnologiesNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo315201China

Fundamental mechanics of gas hydrates is of importance to evaluating geomechanical and geotechnical properties of gas hydrate deposits,but it remains largely unexplored yet due to insufficient direct experimental techniques and high-quality of gas hydrate ***,classic molecular dynamic(MD)simulations are used to study the fracture mechanics of three main methane clathrate hydrates of sI,sII and sH *** results show that the mechanical properties of those three methane clathrate hydrates are intrinsically different and are degraded by the presence of *** show brittle facture and different fracture *** terms of energy release rate,they are ranked as sH>sI>***,the three methane clathrate hydrates with nanocracks can be explained by a modified Griffith ***,it is intriguingly identified tip amorphization during the crack propagation process of the three methane clathrate hydrates,and sH methane clathrate hydrate with specific nanocrack exhibits slower crack propagation than other two methane clathrate hydrates.

关键词： Methane clathrate hydrates Young’s modulus Fracture toughness Griffith criterion Molecular dynamics

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 ***,due to the network defects of polymer gels,traditional hydrogels are usually brittle and fragile,which limits their practical ***,we present a Hofmeister effect-aided facile strategy to prepare high-performance poly(vinyl alcohol)/montmorillonite nanocomposite *** montmorillonite nanosheets can not only serve as crosslinking agents to enhance the mechanical properties of the hydrogel but also promote the ion *** 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 *** a result,the as-prepared nanocomposite hydrogels possess unique physical properties,including robust mechanical and electrical *** as-prepared hydrogels can be further assembled into a high-performance flexible sensor,which can sensitively detect large-scale and small-scale human *** 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

Surface-induced interaction of colloidal particles in isotropic liquid crystals

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Communications in Theoretical physics 2024年第7期76卷 114-122页

作者： Hualing Zhang Kaifeng Weng Rui Ma department of physics College of Physical Science and TechnologyXiamen UniversityXiamen 361005China fujian provincial key laboratory for soft functional materials research Research Institute for Biomimetics and Soft MatterXiamen UniversityXiamen 361005China

In this work,we study the interaction between two colloidal particles in a liquid crystal that is in the isotropic *** interaction is caused by surface-induced polarization of the liquid crystal molecules in the vicinity of the *** find that the interaction is short-ranged in both 2D and 3D *** symmetric homeotropic anchoring conditions,the interaction is *** under anti-symmetric homeotropic anchoring conditions,the interaction is repulsive at short distances but attractive at intermediate *** particle size has a strong impact on the effective interaction force.

关键词： surface-induced interaction colloidal particles liquid crystals