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Robust and Smart Hydrogels Based on Natural Polymers

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Chinese Journal of Polymer Science 2017年第10期35卷 1165-1165,1166-1180页

作者： Jiang-jiang Duan 张俐娜 College of Chemistry and Molecular Sciences Wuhan University Wuhan 430072 China

This review summarizes recent progress of the robust and smart hydrogels prepared from natural polymers including polysaccharides, proteins, etc. These hydrogels exhibit outstanding mechanical properties due to their nanofibrous aggregated microstructures and special crosslinking networks. Furthermore, these hydrogels show some smart stimuliresponsive behaviors triggered by p H, temperature, light, electricity and magnetism. Hopefully, these hydrogels derived from natural polymers with inherent biodegradation and biocompatibility have great application potential in the fields of biomedicine, tissue engineering, soft robots and bio-machine.

关键词： Robust and smart hydrogels Natural polysaccharides nanofiber Biomedical applications

Critical Role of Silicon in Directing the Bio-inspired Mineralization of Gelatin in the Presence of Hydroxyapatite

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Journal of Bionic Engineering 2021年第6期18卷 1413-1429页

作者： Ruijuan Yao Yao Wang Bo Zhang Juan Liu Nihui Zhang Jing He Guolong Meng Bo Jiang Shanling Wang Fang Wu National Engineering Research Centre for Biomaterials Sichuan UniversityChengdu 610064China Analytical and Testing Center Sichuan UniversityChengdu 601165China

Significant progress has been made on understanding the critical role of organic components in directing the collagen *** hypothesize that the inorganic trace elements might also play important role in the mineralization of collagenous *** this aim,we systematically compared the in-vitro biomineralization behaviors of gelatin,gelatin-HA and gelatin-SiHA electrospun *** results indicated that the presence of Si ions played a striking influence on the nucleation behaviors and mineralized *** gelatin-SiHA samples demonstrated more homogeneous nucleation within the gelatin fiber and growth along the fiber direction,in comparison with the heterogeneous nucleation and growth of spherulitic clusters on top of the nanofiber surface,*** *** likely shift of the nucleation mode to the intrafibrillar mineralization in the presence of Si ions led to good alignment of apatite c-axis with the long axis of the nanofiber,resulting in a mineralization process and microstructure that were closer to those in natural *** response analysis indicated that Si incorporation improved the MSC attachment and cytoskeleton *** findings might have important implication in both understanding the complex mechanisms involved in collagen mineralization and optimal designing of advanced bio-inspired materials with potential superior mechanical and biological properties.

关键词： Silicon Hydroxyapatite Biomineralization Electrospinning nanofiber Gelatin

Investigating the structural effect of electrospun nano-fibrous polymeric films on water vapor transmission

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Chinese Journal of Chemical Engineering 2019年第1期27卷 100-109页

作者： Seyed Jalil Poormohammadian Parviz Darvishi Abdol Mohammad Ghalambor Dezfuli Chemical Engineering Department School of EngineeringYasouj University Physics Department Shahid Chamran University of Ahvaz

Electrospun polymers have many applications in the ***, the structure of these polymers has been less widely considered by *** this work, the structural effect of electrospun and casted films of polyacrylonitrile(PAN) and polyvinylidene fluoride(PVDF) polymers on water vapor transmission were *** of water vapor was measured at 35, 60 and 80 ℃ and different relative *** diffusion coefficients were calculated based on mass changes of the polymer *** water vapor transmission rate(WVTR) was also measured at 35 ℃ and 90% relative *** results indicated that electrospun nano-fibrous polymers(ESNPs) absorb much higher water vapor compared to non-porous casted *** interaction of water molecules with mentioned polymers was investigated based on Flory-Huggins *** Flory-Huggins interaction parameter of electrospun films was less than casted films, suggesting much better interaction of water molecules with electrospun *** was also found that electrospun films have anomalous kinetic behavior and do not obey the Fickian diffusion ***, it was revealed that ESNPs show less resistance to water vapor transmission and they are good candidates for the applications of water vapor separation using membranes.

关键词： Water vapor transmission Polymer structure nanofiber Electrospinning Porous layer

Fabrication and electrochemical performance of nanofibrous micro-frameworks of α-MnO_2

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Particuology 2014年第6期12卷 54-58页

作者： Dalai Jin Ruirui Liu Xiaochu Ding Longcheng Wang Lina Wang Linhai Yue Center of Materials Engineering Zhejiang Sci-Tech University Department of Chemistry Zhejiang University Department of Chemistry Michigan Technological University1400 Townsend DriveMI 49931USA Key Laboratory of Advanced Textile Materials and Manufacturing Technology Ministry of EducationZhejiang Sci-Tech University

A facile solid-phase conversion route is proposed to fabricate a micro-framework of α-MnO2 with a nanofibrous structure and high *** fabrication is achieved by a three-step process using a preformed manganese tartrate with a rectangular framework as the precursor followed by thermal annealing and hydrothermal oxidation to form the final nanofibrous *** of the phase and the morphology are characterized by FESEM,XRD,TG-DTA,and TEM *** electrochemically active material α-MnO2 exhibits both attractive stability of the Coulombic efficiency after long-term cyclic charging/discharging and acceptable specific capacitance.

关键词： Manganese oxide Hierarchical structure nanofiber

Hierarchical charge distribution controls self-assembly process of silk in vitro

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Frontiers of Materials Science 2015年第4期9卷 382-391页

作者： YiZHANG Cencen ZHANG Lijie LIU David L. KAPLAN Hesun ZHU Qiang LU National Engineering Laboratory for Modern Silk & Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow University Suzhou 215123 China College of Textile and Clothing Engineering Soochow University Suzhou 215123 China Department of Biomedical Engineering Tufts University Medford MA 02155 USA Textile College Henan Institute of Engineering Zhengzhou 450007 China Research Center of Materials Science Beijing Institute of Technology Beijing 100081 China

Silk materials with different nanostructures have been developed without the understanding of the inherent transformation mechanism. Here we attempt to reveal the conversion road of the various nanostructures and determine the critical regulating factors. The regulating conversion processes influenced by a hierarchical charge distribution were investigated, showing different transformations between molecules, nanoparticles and nanofibers. Various repulsion and compressive forces existed among silk fibroin molecules and aggregates due to the exterior and interior distribution of charge, which further controlled their aggregating and deaggregating behaviors and finally formed nanofibers with different sizes. Synergistic action derived from molecular mobility and concentrations could also tune the assembly process and final nanostructures, it is suggested that the complicated silk fibroin assembly processes comply a same rule based on charge distribution, offering a promising way to develop silk-based materials with designed nanostructures.

关键词： silk self-assembly charge nanostructure nanofiber

Nanofibrous nerve conduits for repair of 30-mm-long sciatic nerve defects

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Neural Regeneration Research 2013年第24期8卷 2266-2274页

作者： Esmaeil Biazar Saeed Heidari Keshel Majid Pouya Hadi Rad Melody Omrani Nava Mohammad Azarbakhsh Shirin Hooshmand Department of Biomaterial Engineering Tonekabon Branch Islamic Azad University Student Research Committee Proteomics Research Center Faculty of Paramedical Sciences Shahid Beheshti University of Medical Sciences Department of Tissue Engineering School of Advanced Technologies in Medicine Tehran University of Medical Sciences Department of Medical Sciences Tonekabon Branch Islamic Azad University Faculty of Medical Sciences Babol University of Medical Sciences

It has been confirmed that nanofibrous poly（3-hydroxybutyrate-co-3-hydroxyvalerate） nerve conduit can promote peripheral nerve regeneration in rats. However, its efficiency in repair of over 30-mm-long sciatic nerve defects needs to be assessed. In this study, we used a nanofibrous poly（3-hydroxybutyrate-co-3-hydroxyvalerate） nerve conduit to bridge a 30-mm-long gap in the rat sciatic nerve. At 4 months after nerve conduit implantation, regenerated nerves were macroscopi- cally observed and histologically assessed. In the nanofibrous graft, the rat sciatic nerve trunk had been reconstructed by restoration of nerve continuity and formation of myelinated nerve fiber. There were Schwann cells and glial cells in the regenerated nerves. Masson＇s trichrome staining showed that there were no pathological changes in the size and structure of gastrocnemius muscle cells on the operated side of rats. These findings suggest that nanofibrous poly（3-hydroxybutyrate-co-3- hydroxyvalerate） nerve conduit is suitable for repair of long-segment sciatic nerve defects.

关键词： neural regeneration peripheral nerve injury sciatic nerve artificial conduit nanofiber poly(3-hydr-oxybutyrate-co-3-hydroxyvalerate) macroscopic observation histology grants-supported paper neuroregeneration

Layer-by-Layer Assembled Bacterial Cellulose/Graphene Oxide Hydrogels with Extremely Enhanced Mechanical Properties

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Nano-Micro Letters 2018年第3期10卷 52-61页

作者： Honglin Luo Jiaojiao Dong Fanglian Yao Zhiwei Yang Wei Li Jie Wang Xinhua Xu Jian Hu Yizao Wan School of Materials Science and Engineering East China Jiaotong University School of Materials Science and Engineering Tianjin Key Laboratory of Composite and Functional Materials Key Laboratory of Advanced Ceramics and Machining Technology Ministry of Education Tianjin University School of Chemical Engineering Tianjin University

Uniform dispersion of two-dimensional(2 D) graphene materials in polymer matrices remains challenging. In this work, a novel layer-by-layer assembly strategy was developed to prepare a sophisticated nanostructure with highly dispersed 2 D graphene oxide in a three-dimensional matrix consisting of onedimensional bacterial cellulose(BC) nanofibers. This method is a breakthrough, with respect to the conventional static culture method for BC that involves multiple in situ layer-by-layer assembly steps at the interface between previously grown BC and the culture medium. In the as-prepared BC/GO nanocomposites, the GO nanosheets are mechanically bundled and chemically bonded with BC nanofibers via hydrogen bonding,forming an intriguing nanostructure. The sophisticated nanostructure of the BC/GO leads to greatly enhanced mechanical properties compared to those of bare BC. This strategy is versatile, facile, scalable, and can be promising for the development of high-performance BC-based nanocomposite hydrogels.

关键词： Bacterial cellulose Nanocomposite Graphene oxide Biosynthesis nanofiber Hydrogels

Current research on electrospinning of silk fibroin and its blends with natural and synthetic biodegradable polymers

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Frontiers of Materials Science 2013年第2期7卷 129-142页

作者： Jian-Guang ZHANG Xiu-Mei MO Biomaterials and Tissue Engineering Lab College of Chemistry Chemical Engineering & Biotechnology Donghua University Shanghai 201620 China

Silk fibroin （SF） is a kind of natural polymers with a great potential in biomedical application. Due to its good biocompatibility, biodegradability and minimal inflammatory reaction, SF is an excellent candidate for generating tissue engineering scaffolds. Electrospinning is a simple and effective method to fabricate nanofibers, which has several amazing characteristics such as very large surface area to volume ratio, flexibility in surface functionalities, and superior mechanical performance. The electro- spun nanofibers from SF and its blends have been used for varied tissue engineering. This paper will give a brief review about the structure, properties and applications of SF and blend nanofibers via electrospinning.

关键词： electrospinning nanofiber silk fibroin (SF) biodegradable polymer

Advances on ultra-sensitive electrospun nanostructured electrochemical and colori metric sensors for diabetes mellitus detection

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Nano Materials Science 2021年第4期3卷 321-343页

作者： Mohamed Hasaan Hussain Lim Ping Fook Maria Kana Sanira Putri Huey Ling Tan Noor Fitrah Abu Bakar Norbert Radacsi School of Chemical Bngineering College of Engineering University Teknologi MARA 40450 Shah AlamSelangorMalaysia School of Engineering Institute for Materials and ProcessesThe University of EdinburghRobert Stevenson RoadEdinburghEH93FBUnited Kingdom

Recent developments in the biochemical and medicinal industries have been heavily focused on producing affordable glucose biosensors due to the condi nuous annual increase of diabetic patients *** devel-opment of a fast,accurate,and reliable glucose sensor will increase confidence in controlling di abetes mellitus and its assoclated health complications among the diabetic *** is a versatile method that can produce complex nanofbrous assemblies with attractiwe and functional characteristics from varlous *** nanofibers demonstrated high efficiency in the immobilization of biological molecules,which can improve the sensing performance *** ation of polymer electrospun nanofibers with metal nanoparticles,metal oxde or transition metal in producing nanobiocomposites is also a highly popul ar approach in the past few *** report presents the current progress and research trends of the technique,focusing on varous ma-terials and fabrication strategies used to produce biosensing *** helps readers decide the suitable approach in designing highly sensitive,selective,fast,and inexpensive glucose sensors.

关键词： Glucose sensor Electrospinning nanofiber Electrochemical sensing Colorimetric sensing