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Surface patterning and modification of polyurethane biomaterials using silsesquioxane-gelatin additives for improved endothelial affinity

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Science China Chemistry 2014年第4期57卷 596-604页

作者： hou linxi PECK Yvonne WANG XiaoWen WANG DongAn College of Chemistry and Chemical Engineering Fuzhou University Division of Bioengineering School of Chemical and Biomedical Engineering Nanyang Technological University

Polyurethanes(PUs) are well-known for their biocompatibility but their intrinsic inert property hampers cell-matrix interactions. Surface modifications are thus necessary to widen their use for biomedical applications. In this work, surface modifications of PU were achieved first by incorporating polyhedral oligomeric silsesquioxane(POSS), followed by alteration of the surface topography via the breath figures method. Subsequently, surface chemistry was also modified by immobilization of gelatin molecules through grafting, for the enhancement of the surface cytocompatibility. Scanning electron microscopy(SEM) was used to verify the formation of highly ordered microstructures while static contact angle, FTIR and XPS confirmed the successful grafting of gelatin molecules onto the surfaces. In vitro culture of human umbilical vein endothelial cells(HUVECs) revealed that endothelial cell adhesion and proliferation were significantly enhanced on the gelatin-modified surfaces, as shown by live/dead staining and WST-1 proliferation assay. The results indicated that the combination of the strategies yielded an interface that improves cell attachment and subsequent growth. This enhancement is important for the development of higher quality biomedical implants such as vascular grafts.

关键词： biomaterials surface modification pattern polyurethane silsesquioxane gelatin endothelization

Preparation of N-doped porous carbons via high internal phase emulsion template

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Progress in Natural Science:Materials International 2021年第2期31卷 270-278页

作者： Yulai Zhao Zhikui Zhao Zhongzheng Zhu Anjun Wang linxi hou Department of Materials-Oriented Chemical Engineering College of Chemical Engineering Fuzhou University

Heteroatom doped porous carbon materials have great application prospects in supercapacitors. In the present study, an approach of preparing N-doped porous carbon（NPC） was proposed from porous poly（resorcinolformaldehyde-melamine） monoliths which were prepared by high internal phase emulsion（HIPE） *** was dissolved in the external phase and copolymerized, acting as the N source and porous structure regulator to provide micropore-dominant NPCs. The structure, morphology, specific surface area（SSA）, and chemical composition of the samples were systematically studied. With melamine content increasing, N-doping content in NPC increased while the SSA of NPC increased at first and then decreased. When the content of N is 8.42 wt%, the obtained NPC showed the highest SSA of about 1670 m2g-1. Furthermore, high N doping content could improve the electronic conductivity and provide additional pseudocapacitance of NPC. Under the combined influences of proper N content and high porosity, the prepared NPC electrodes revealed excellent specific capacitance(228.0 Fg-1at 1.0 A g-1, favorable circling stability, and prominent rate capability in a threeelectrode system with 6 M KOH solution as the electrolyte.

关键词： High internal phase emulsion N-doped porous carbon Melamine Supercapacitor

Measurement of the fluidized velocity in gas-solid fluidized beds based on AE signal analysis by wavelet packet transform

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Science China Chemistry 2007年第2期50卷 284-289页

作者： WANG JingDai YANG YongRong GE PengFei SHU WeiJie hou linxi Department of Chemical and Biochemical Engineering State Key Laboratory of Chemical EngineeringPolymer Reaction Engi-neering DivisionZhejiang UniversityHangzhou 310027China College of Chemical Engineering and Materials Science Ningbo UniversityNingbo 315211China

An energy distribution theory was presented based on regular evolvement of energy fraction of acous-tic signals with fluidization velocity. Wavelet packet analysis was used in processing the acoustic sig-nals originated from particle impact on the wall of a fluidized bed. A new criterion of judging incipient fluidization(Umf) velocity and minimum turbulent velocity(Umt) was proposed according to the energy distribution theory. Experiments were performed with five groups of high density polyethylene(PE) particles and one bimodal PE to acquire incipient fluidization velocity and minimum turbulent velocity by using the criterion. The feasibility of this method in obtaining characteristic fluidization parameters was further verified by comparing it to results from the pressure drop method and the empirical value from industry.

关键词： fluidized bed minimum fluidization velocity minimum turbulent velocity acoustic emission wavelet packet transform

One-step synthesis of cyclic polypyrazole and the self-assembly vesicles driven by hydrogen bond

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Chinese Chemical Letters 2022年第2期33卷 825-829页

作者： Zhen Lu Bogeng Guo Yulai Zhao linxi hou Longqiang Xiao Department of Materials-Oriented Chemical Engineering College of Chemical EngineeringFuzhou UniversityFuzhou 350116China Fujian Key Laboratory of Advanced Manufacturing Technology of Specialty Chemicals Fuzhou UniversityFuzhou 350116China

The synthesis of cyclic polymer is an important topic in polymer chemistry. Herein, we report a one-step method to prepare cyclic polypyrazoles. Monomers with two functional groups, diazo and alkyne, were synthesized and polymerized via 1,3-diploar cycloaddition in bulk under heating without any *** with molecular weights in the range of 3800-4400 g/mol and yields in the range of 78.8-98.7% were successfully synthesized. No chain end group was detected by LC-QTOF-MS and FTIR, which proves the cyclic structure of polypyrazoles. What is noteworthy is that the cyclic polypyrazoles can selfassemble into vesicles during the reprecipitation process, which was proved by the results of SEM and TEM. The reason for that is the formation of intermolecular hydrogen bond between NH and ester groups.

关键词： 1,3-Dipolar cycloaddition Polypyrazole Self-assembly Cyclic polymers

Efficient homogenous catalysis of CO_(2) to generate cyclic carbonates by heterogenous and recyclable polypyrazoles

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Chinese Journal of Chemical Engineering 2022年第3期35卷 110-115页

作者： Zhen Lu Jie He Bogeng Guo Yulai Zhao Jingyu Cai Longqiang Xiao linxi hou Department of Materials-Oriented Chemical Engineering School of Chemical EngineeringFuzhou UniversityFuzhou 350116China Qingyuan Innovation Laboratory Quanzhou 362801China Fujian Key Laboratory of Advanced Manufacturing Technology of Specialty Chemicals Fuzhou UniversityFuzhou 350116China

The cycloaddition between CO_(2)and epoxides to produce cyclic carbonate is an attractive and efficiency pathway for the utilization of CO_(2)as C1 *** development of catalyst to mediate cycloaddition between CO_(2)and epoxides at low temperature and pressure is still a ***,a series of polypyrazoles with glass transition temperature(T_(g))in the range of 42.3-52.5℃ were synthesized and served as catalyst to mediate the cycloaddition of CO_(2)and epoxides by the assistant of tetrabutylammonium *** catalytic behaviors of polypyrazole on the model cycloaddition of CO_(2)to epichlorohydrin,including the reaction parameters optimization and versatility were investigated in detail,and excellent yield(99.9%)and selectivity(99%)were obtained under the optimized reaction conditions of70℃ and 1.0 MPa for 6.0 ***,the polypyrazole acts as homogeneous catalyst during reaction(higher than T_(g)).And under room temperature,polypyrazoles can be easily separated and recovered,which is a promising feature of a heterogeneous ***,the reaction mechanism was *** DFT calculation suggested that the formation of hydrogen bond between pyrazole and epoxide greatly reduced the energy barrier,which play an important role in promoting CO_(2)cycloaddition.

关键词： Carbon dioxide CO_(2)conversion Cyclic carbonate Heterogeneous catalysis Polypyrazole

Preparation of Si-doped and cross linked carbon nanofibers via electrospinning and their supercapacitive properties

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Progress in Natural Science:Materials International 2018年第3期28卷 337-344页

作者： Yulai Zhao Zhuang Zhao Mengzhi Wei Xiancai Jiang Hongmei Li Jiao Gao linxi hou Department of Materials-Oriented Chemical Engineering College of Chemical EngineeringFuzhou University

In this work, Si-doped cross linked carbon nanofibers(Si/CNF) were prepared by electrospinning polyacrylonitrile(PAN) solutions containing polyhedral oligomeric silsesquioxane(POSS) as Si source, followed by thermal treatments. Scanning electron microscope(SEM) observations showed the smooth surfaces of pure PAN nanofibers, while PAN/POSS nanofibers with obviously rough or porous surfaces were obtained with relatively high POSS content. X-ray diffraction(XRD) identified the presence of POSS in the composite nanofibers. After thermal treatments, cross linked Si/CNFs with various morphologies were obtained. Energy-dispersive X-ray(EDX) and X-ray photoelectron spectroscopy(XPS) analyses confirmed the successful incorporation of Si into CNFs. Raman spectra suggested the degree of carbon ordering of Si/CNFs reduced slightly when compared with pure CNF. The obtained nanofibers exhibited typical performances of electric double-layer capacitors(EDLC).The specific capacitance of Si/CNF showed a moderate increase with POSS content and reached a maximum of175 F/g at 1 A/g with PAN:POSS equal to 100:5. Meanwhile Si/CNFs exhibited excellent cycling stability after1000 cycles. The influence of POSS on the capacitive performance might be attributed to the combined effects of evolution of morphology, conductivity and surface properties of Si/CNFs.

关键词： Supercapacitor Cross linked carbon nanofibers Si doping Electrospinning Polyhedral oligomeric silsesquioxane(POSS)

A mussel-inspired supramolecular hydrogel with robust tissue anchor for rapid hemostasis of arterial and visceral bleedings

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Bioactive Materials 2021年第9期6卷 2829-2840页

作者： Ziwen Qiao Xueli Lv Shaohua He Shumeng Bai Xiaochen Liu linxi hou Jingjing He Dongmei Tong Renjie Ruan Jin Zhang Jianxun Ding Huanghao Yang Qingyuan Innovation Laboratory College of Chemical EngineeringFuzhou University2 Xueyuan RoadFuzhou350108PR China MOE Key Laboratory for Analytical Science of Food Safety and Biology State Key Laboratory of Photocatalysis on Energy and EnvironmentCollege of ChemistryFuzhou University2 Xueyuan RoadFuzhou350108PR China College of Biological Science and Engineering Fuzhou University2 Xueyuan RoadFuzhou350108PR China Department of Pediatric Surgery Fujian Provincial Hospital134 Dongjie RoadFuzhou350001PR China Key Laboratory of Polymer Ecomaterials Changchun Institute of Applied ChemistryChinese Academy of Sciences5625 Renmin StreetChangchun130022PR China

In recent years,the developed hemostatic technologies are still difficult to be applied to the hemostasis of massive arterial and visceral hemorrhage,owing to their weak hemostatic function,inferior wet tissue adhesion,and low mechanical ***,a mussel-inspired supramolecular interaction-cross-linked hydrogel with robust mechanical property(308.47±29.20 kPa)and excellent hemostatic efficiency(96.5%±2.1%)was constructed as a hemostatic ***,we combined chitosan(CS)with silk fibroin(SF)by cross-linking them through tannic acid(TA)to maintain the structural stability of the hydrogel,especially for wet tissue adhesion ability(shear adhesive strength=29.66±0.36 kPa).Compared with other materials reported previously,the obtained CS/TA/SF hydrogel yielded a lower amount of blood loss and shorter time to hemostasis in various arterial and visceral bleeding models,which could be ascribed to the synergistic effect of wound closure under wet state as well as intrinsic hemostatic activity of *** a superior hemostatic sealant,the unique hydrogel proposed in this work can be exploited to offer significant advantages in the acute wound and massive hemorrhage with the restrictive access of therapeutic moieties.

关键词： Mussel-inspired hydrogel Supramolecular cross-linking Robust tissue anchor Hemostatic sealant Arterial and visceral bleeding models

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有机累托石/环氧树脂复合材料的结构及性能

硅酸盐学报 2011年第7期39卷 1223-1228页

作者：侯琳熙刘燕宁波大学材料科学与化学工程学院浙江宁波315211

以热稳定性较高的离子液体1-十六烷基-3-甲基咪唑溴盐(1-hexadecyl-3-methylimidazolium bromide,C16mimBr)为改性剂,制备了有机累托石(organic-rectorite,OREC)。以环氧树脂(epoxy resin,EP)为基体,分别用2-乙基-4-甲基咪唑(2-ethyl-4-methylimidazole,2-E-4-MI)和桐油酸酐(tung oil anhydride,TOA)作固化剂,制得了2种有机累托石/环氧树脂复合材料。对复合材料的微观结构、力学性能和耐热性能进行了测试。结果表明:以2-E-4-MI为固化剂时,只能形成插层型纳米复合材料;以TOA为固化剂时,OREC在较低含量时易在环氧树脂基体中形成剥离型纳米复合材料。OREC添加量为2%(质量分数)时,剥离型纳米复合材料具有最佳力学性能和耐热性能。与纯环氧树脂固化物相比,其拉伸强度提高了60.3%,弯曲强度提高了26.7%,弯曲模量提高了34%,热分解温度提高了14℃,玻璃化转变温度提高了5.5℃。

关键词：环氧树脂插层剥离力学性能/耐热性能离子液体-累托石

基于电影《百鸟朝凤》民族器乐文化传承的相关思考

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电影评介 2022年第20期 110-112页

作者：侯林希贵州民族大学音乐舞蹈学院

《百鸟朝凤》改编自肖江虹的同名小说,讲述了游天鸣从小跟随德高望重的唢呐老艺人--焦三爷学习唢呐,并与师傅一起在时代发展变革中,执着坚守、传承唢呐技艺和精神的故事。作为一部展现民间传统器乐演奏与传承历程的非商业电影,《百鸟朝... 详细信息

《百鸟朝凤》改编自肖江虹的同名小说,讲述了游天鸣从小跟随德高望重的唢呐老艺人--焦三爷学习唢呐,并与师傅一起在时代发展变革中,执着坚守、传承唢呐技艺和精神的故事。作为一部展现民间传统器乐演奏与传承历程的非商业电影,《百鸟朝凤》以器乐传承、中西方文化碰撞为叙事切入点,在当时的社会背景下,以细腻的叙事手法展现了现实的复杂、命运的无奈、自我的抗争与文化的冲击等议题。配乐多以唢呐为主,据不同阶段场景演绎不同唢呐曲目,传达人物情绪,为故事转折进行铺垫,具有强烈的情感冲击。

关键词：《百鸟朝凤》民族器乐器乐演奏老艺人文化传承民间传统同名小说相关思考