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cellulose fibers-reinforced self-expanding porous composite with multiple hemostatic efficacy and shape adaptability for uncontrollable massive hemorrhage treatment

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Bioactive Materials 2021年第7期6卷 2089-2104页

作者： Yansen Wang Yifan Zhao Longxue Qiao Faxing Zou Yajie Xie Yudong Zheng Yong Chao Ying Yang Wei He Siming Yang School of Materials Science and Engineering University of Science and Technology BeijingBeijing100083PR China Department of Anesthesiology Medical College of Chinese PLABeijing100853PR China Department of Medical Engineering The First Affiliated Hospital of the PLA General HospitalBeijing100048PR China First Affiliated Hospital of Medical College Zhejiang UniversityHangzhou310003PR China Key Laboratory of Wound Repair and Regeneration of PLA Chinese PLA General HospitalMedical College of PLABeijing100853PR China

Uncontrollable hemorrhage leads to high mortality and thus effective bleeding control becomes increasingly important in the military field and civilian trauma ***,current hemostats not only present limitation when treating major bleeding,but also have various side *** we report a self-expanding porous composites(CMCP)based on novel carboxymethyl cellulose(CMC)fibers and acetalized polyvinyl alcohol(PVA)for lethal hemorrhage *** CMC fibers with uniform fibrous structure,high liquid absorption and procoagulant ability,are evenly interspersed inside the composite *** obtained composites possess unique fiber-porous network,excellent absorption capacity,fast liquid-triggered self-expanding ability and robust fatigue resistance,and their physicochemical performance can be fine-tuned through varying the CMC *** vitro tests show that the porous composite exhibits strong blood clotting ability,high adhesion to blood cells and protein,and the ability to activate platelet and the coagulation *** vivo hemostatic evaluation further confirms that the CMCP presents high hemostatic efficacy and multiple hemostatic effects in swine femoral artery major hemorrhage ***,the CMCP will not fall off from the injury site,and is also easy to surgically remove from the wound cavity after the ***,results of CT tomography and 3D reconstruction indicate that CMCP can achieve shape adaptation to the surrounding tissues and the wound cavities with different depths and shapes,to accelerate hemostasis while protecting wound tissue and preventing infection.

关键词： Porous materials cellulose fibers Self-expanding ability Shape-adaptive Hemostasis

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Bioinspired polymeric heart valves derived from polyurethane and natural cellulose fibers

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Journal of Materials Science & Technology 2023年第13期144卷 178-187页

作者： Feng Guo Rizheng Han Jishan Ying Zeping Zhang Rui Yang Xing Zhang Institute of Metal Research Chinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China

In this work,bioinspired anisotropic polymeric heart valves were fabricated using composite materials from polyurethane(PU)and natural cellulose fiber *** fibers with good alignment were obtained from balsa wood by a top-down process,which were then distributed in polyurethane to pre-pare cellulose fiber bundles reinforced polyurethane(CPU)by hot *** storage modulus of the CPU along the direction parallel to the fiber alignment was 16.70±0.80 MPa,whereas that along the direction perpendicular to the fiber alignment was 8.41±0.94 MPa by dynamic mechanical analysis(DMA)tests at 1 Hz,comparable to aortic valve ***,2-methacryloyloxyethyl phosphoryl-choline(MPC)was grafted onto the CPU surface(CPU-MPC)to improve *** MPC modification,the water contact angle decreased significantly from 54.58°±2.98°to 26.42°±3.50°,and the platelet adhesion was reduced by 92%,compared to the original *** vitro cell culture proved that both CPU and CPU-MPC samples did not show any ***,the CPU composites were used to fabricate polymeric heart valves,which showed excellent hydrodynamic performance with a large orifice area(1.70 cm 2)and low regurgitation fraction(0.7%),meeting the requirements of ISO 5840-2 standard.

关键词： Polymeric heart valve Anisotropy cellulose fibers Polyurethane

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Numerical simulation of the motion of cellulose fibers in a centrifugal cleaner

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Journal of Bioresources and Bioproducts 2016年第3期1卷 120-126页

作者： Zhijun Hu Jiang Lin Jessica Wu Key Laboratory of Recycling and Eco-treatment of Waste Biomass of Zhejiang Province Zhejiang University of Science and TechnologyHangzhou 310023China Department of Chemical Engineering University of New BrunswickFrederictonE3B 5A3Canada

Centrifugal cleaners are commonly used in the pulp and paper industry to separate contaminates from pulp *** reveal the separation mechanism of cellulose fibers and impurities in a centrifugal cleaner,three-dimensional computational fluid dynamics(CFD)models were established based on experimental analyses with the inlet flow rate and outlet diameter as the *** incompressible three-dimensional Navier-Stokes equations were applied to describe the fluid *** simulation results showed that an increased inlet flow rate could improve the efficiency by enhance of the centrifugal force on *** swirling patterns were predominant for centrifugal cleaners with smaller lower *** crowding effect played an important role in the separation of heavy contaminants,and the separating efficiency was proportional to the inlet flow rate and inverse proportional to the lower outlet diameter.

关键词： cellulose fibers centrifugal cleaner numerical simulation separation

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Mechanical properties of carbon fiber/cellulose composite papers modified by hot-melting fibers

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Progress in Natural Science:Materials International 2014年第1期24卷 56-60页

作者： Yunzhou Shi Biao Wang State Key Laboratory for Modification of Chemical fibers and Polymer Materials Donghua University

Carbon fiber(CF)/cellulose(CLS) composite papers were prepared by papermaking techniques and hot-melting fibers were used for modification. The mechanical properties of the obtained composite papers with different CF,CLS and hot-melting fiber ratios were studied and further discussed. It is observed that,for both CF/CLS composite papers and those modified by hot-melting fibers,the normal stress firstly increases and then declines with the addition of carbon fibers. The results also show that with the addition of hot-melting fibers,the modified papers exhibit enhanced mechanical performance compared to CF/CLS composite papers. Through SEM characterization,it is confirmed that the improvement of mechanical properties attributes to the reinforcement of adhesive binding at the fiber overlap nodes. Also,through four-probe method,the resistivity and the electrical performance of the modified and unmodified papers were characterized and the result shows that the hot-melting fiber modification brings no harm to the electrical properties.

关键词： Carbon fibers Composite papers cellulose fibers Mechanical properties Modification

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A facile ionic liquid approach to prepare cellulose fiber with good mechanical properties directly from corn stalks

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Green Energy & Environment 2020年第2期5卷 223-231页

作者： Jiming Yang Xingmei Lu Yanqiang Zhang Junli Xu Yongqing Yang Qing Zhou Beijing Key Laboratory of Ionic Liquids Clean Process CAS Key Laboratory of Green Process and EngineeringState Key Laboratory of Multiphase Complex SystemsInstitute of Process EngineeringChinese Academy of SciencesBeijing100190China School of Chemical Engineering University of Chinese Academy of SciencesBeijing100049China

It is very difficult to directly spin the lignocellulose without *** liquids(ILs)are promising solvent to dissolve lignocellulose to prepare cellulose ***,the degree of cellulose polymerization(DP)is reduced when lignocellulose is dissolved in ILs,and the lignin removal rate is *** elongation at break and tensile strength of the fibers obtained by spinning the lignocellulose dissolved in ILs are *** this paper,preparing cellulose fiber directly from lignocellulose based on dissolving corn stalk via[C4mim]Cl-L-arginine binary system is *** shows that the removal rate of lignin can reach 92.35%and the purity of cellulose can reach 85.32%after corn stalk was dissolved at 150℃C for 11.5 h when the mass fraction of arginine is 2.5%.The elongation at break of fiber reached 10.12%and the tensile strength reached 420 *** is mainly due to the fact that L-arginine not only inhibits the degradation of cellulose but also promotes the *** any pulping or pretreatment,preparing cellulose fibers via direct dissolution and extrusion may provide a simple and effective way to prepare many novel cellulose materials.

关键词： cellulose fibers Ionic liquids Corn stalks Dissolving Directly spinning

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Paracetamol Sensitive cellulose-Based Electrochemical Sensors

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Journal of Renewable Materials 2018年第3期6卷 242-250页

作者： Maxime Pontie Serge Foukmeniok Mbokou Jean-Philippe Bouchara Bienvenue Razafimandimby Sylvie Egloff Ornella Dzilingomo Pierre-Yves Pontalier Ignas Kenfack Tonle Host-Pathogen Interaction Study Group(GEIHP EA 3142)UNIV AngersUNIV BrestBretagne Loire UniversityInstitute of Health Biology-IRISCHU4 rue Larrey49933 AngersFrance Electrochemistry and Chemistry of Materials Department of ChemistryUniversity of DschangP.O.Box 67 DschangCameroon Toulouse University INP-ENSIACETLCA(Laboratory of Agro-industrial Chemistry)31030 Toulouse France

Electrochemical determination of paracetamol(PCT)was successfully performed using carbon paste electrodes(CPEs)modified with treated coffee husks(CHt)or cellulose powder(Ce).Scanning electron microscopy was used to characterize unmodified or modified CPEs prior to their *** electrochemical oxidation of PCT was investigated using square wave voltammetry(SWV)and cyclic voltammetry(CV).The oxidation current density of PCT was two-fold higher with the CPE-CHt sensor and 30%higher with CPE-Ce in comparison with the unmodified CPE,and this correlated with the higher hydrophilicity of the modified *** SWV for the electrochemical analysis of PCT,carbon paste electrode modified with raw coffee husks(CPE-CHr)showed the presence of impurities at+0.27 V/SCE,showing the interest in using pure cellulose for the present analytical ***,CPE-Ce presented a higher real area compared to CPE-CHr,which explains the increase in the limit of saturation from 400 mg/L to 950 mg/*** better saturation limit exhibited by CPE-Ce justifies its choice for electroanalysis of PCT in commercialized *** proposed method was successfully applied in the determination of PCT in commercialized tablets(DolipraneR 500)with a recovery rate close to 100%,and no interference with the excipients contained in the tablets analyzed was *** novel sensor opens the way for sustainable development of electroanalytical control of drugs sold individually in developing countries.

关键词： Paracetamol carbon paste electrode coffee husks cellulose fibers square wave voltammetry electroanalysis

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Improving Electrochemical Performance of cellulose Fiber-based Supercapacitor Electrode Using Polypyrrole-wrapped Iron Oxyhydroxide

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Paper And Biomaterials 2021年第3期6卷 10-19页

作者： Youngchu Kang Hailan Jin Xianhui An Xueren Qian Key Laboratory of Bio-based Material Science&Technology(Northeast Forestry University)Ministry of Education HarbinHeilongjiang Province150040China

Polypyrrole(PPy)@cellulose fiber-based composites have been widely investigated as electrode materials for use in flexible ***,they cannot readily provide high specific capacitance and cyclic stability owing to their inherent drawbacks,such as high resistance,Weber impedance,and volume expansion or collapse during charging/*** this study,iron oxyhydroxide(FeOOH)is incorporated in the abovementioned composite to decrease the equivalent series resistance,charge transfer resistance,and Weber impedance,thereby enhancing electron transfer and ion diffusion,which results in superior electrochemical *** PPy-wrapped FeOOH@cellulose fiber-based composite electrode with the molar ratio of FeSO_(4) to NaBH4 of 1∶1 exhibits a high specific capacitance of 513.8 F/g at a current density of 0.2 A/g,as well as an excellent capacitance retention of 89.4% after 1000 cycles.

关键词： cellulose fibers iron oxyhydroxide polypyrrole electrode material electrochemical performance

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Effect of surface modification of ammonium polyphosphate-diatomite composite filler on the flame retardancy and smoke suppression of cellulose paper

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Journal of Bioresources and Bioproducts 2017年第1期2卷 30-35页

作者： Huifang Zhao Lizheng Sha Key Laboratory of Recycling and Eco-treatment of Waste Biomass of Zhejiang Province Zhejiang University of Science and TechnologyHangzhou 310023P.R.China

Ammonium polyphosphate-diatomite composite filler(APP-diatomite composite filler)was modified with silane coupling agent KH550 to improve the flame retardancy of filled *** calorimeter was used to analyze the heat and smoke releasing rates,as well as smoke toxicity of the filled *** distribution of the composite filler particles in paper and the morphology of the charred residues after combustion were investigated by scanning electron microscope(SEM),and the chemical structure of the charred residues was studied with fourier transform infrared spectroscopy(FTIR).Results show that the peak heat releasing rate(PHRR),total heat release(THR)and peak mass loss rate(PMLR)of the filled paper with the modified APP-diatomite decreased markedly,compared with those for the control paper,while the charred residue after combustion *** addition,the filled paper had an increased peak rate of smoke release(RSR)and increased total smoke release(TSR)and peak CO production rates,but a decreased peak CO_(2) production *** was also found that part of the carbon element in the charred residue of the paper loaded with the modified APP-diatomite was in the forms of C=C=C,C≡C and C≡N,and the charred residue had a relatively more intact structure without apparent fiber breakage and longitudinal cracks.

关键词： paper flame retardant paper cellulose fibers surface modification ammonium polyphosphate(APP)-diatomite composite filler flame retardancy smoke suppression

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