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Flame-retardant Mechanism of Magnesium Oxychloride in Epoxy Resin

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Journal of wuhan university of technology(materials Science) 2009年第1期24卷 127-131页

作者：秦麟卿 State Key Laboratory of Advanced technology for materials Synthesis and Processing Wuhan University of Technology center for Material research and Analysis Wuhan University of Technology

Flame-retardant mechanism of magnesium oxychloride （M OC） in EP was in-vestigated by limiting oxygen index （LOI）, XRD, SEM, TG-DTG and DSC. The results show that MOC performed well as an inorganic flame-retardant in EP. When the content of MOC is 50%, the LOI of EP reaches 2..6% and mass of residual char reaches 9.6%. The flame retarde mechanism of MOC is due to the synergies of diluting, cooling, catalyzing char forming and obstructing effects.

关键词： magnesium oxychloride epoxy resin flame-retardant properties flame retardedmechanism

Chitosan——L-Lactic Acid Scaffold for the Regeneration of Peripheral Nerve and Its NGF Release Properties

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Journal of wuhan university of technology(materials Science) 2009年第6期24卷 961-964页

作者：徐海星 Department of Pharmaceutical Engineering School of Chemical EngineeringWuhan University of Technology

Chitosan—L-lactic acid composite scaffold for the regeneration of peripheral nerve is obtained by grafting L-lactic acid onto the amino groups in chitosan with combined vacuum freezer drier. The composite scaffold was characterized by ATR-FTIR and SEM. The scaffold has a better graft efficiency and has a dense inner layer and a loose outer layer with porous structure, and the pore size is about 100 μ*** NGF release properties of the scaffold were investigated. The experimental results showed that, at the 1st day, 15.2.ng of NGF on average was released from the scaffold. From day 2.to day 10, the release rate obviously slowed down and 1.64 ng of NGF was released on average every day. After 10 days, the release rate was slower and 10.3 ng of NGF was released on average every day. After 60 days, NGF could also maintained a certain concentration. These properties show that the scaffold is a better carrier for NGF which can be more advantageous to the regeneration of the damaged peripheral nerve. As a result, this composite scaffold would be an ideal candidate for the regeneration of damaged peripheral nerve.

关键词： chitosan L-lactic acid peripheral nerve NGF release properties

Evaluation of a Novel Bioabsorbable PRGD/PDLLA/β-TCP/NGF Composites in Repair of Peripheral Nerves

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Journal of wuhan university of technology(materials Science) 2009年第3期24卷 409-414页

作者：王永红李世普 Hospital Wuhan University of Technology biomedical materials and Engineering {2. center Wuhan University of Technology

Peripheral nerve regeneration using a novel nerve conduit （PRGD/PDLLA/β TCP/NGF） was evaluated, which was made of RGD peptide modified poly{（lactic acid）-co-[（glycolic acid）-alt-（L-lysine）]} （PRGD）, poly（d,l-lactic acid）（PDLLA） and β-tricalcium phosphate （β-TCP）. And the effectiveness was compared with that of PRGD/PDLLA/β-TCP, PDLLA and autograft in terms of nerve regeneration across a gap. Both of biodegradablity and cell-biocompatibility of the novel nerve conduit were evaluated in vitro. The results show that PRGD/PDLLA/β-TCP/NGF composite ma terials have better biodegradation properties and cell affinity than PDLLA, and could promote the RSC96 Schwann cells adhesion, proliferation and growth on the surface of materials. PRGD/PDLLA/ β-TCP/NGF composite conduit was significantly superior to that of the PDLLA conduit in histological and axon morphologic index. PRGD/PDLLA/β-TCP/NGF conduit is more beneficial to nerve regeneration than PDLLA conduit. The biodegradable PDLLA/PRGD/β-TCP/NGF conduit has a good biocompatibility with rats tissue and it could effectively promote the nerve regeneration after bridging sciatic nerve defect of rats, the effect is as good as that of the autograft nerve, significantly superior to the PRGD/PDLLA/β-TCP conduit and PDLLA conduit. PDLLA/PRGD/β-TCP/NGF composite conduit is a potential ideal conduit.

关键词： peripheral nerve nerve conduit PDLLA/PRGD/β-TCP/NGF composite regeneration

Preparation and Gas-sensing Characteristics of Na^+-doped ZnO Single Crystals

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Journal of materials Science & technology 1994年第4期10卷 289-292页

作者： Suying PAN and Junbiao MAO (center for materials {2. and Analysis, wuhan university of technology, wuhan, 430070, China)(To whom correspondence should be addressed) wuhan Univ of technology Wuhan China

ZnO single crystals were grown by vapor phase reaction of Zno powder with active carbon powdei at an elevated temperature The typical crystals were colorless and transparent with maximum size o4 0.1 mm in diameter and 2. mm in length, The gas-sensing characteristics of Na+-doped anc undoped single crystals were investigated in 1 %H2. Co and CH, in air between 1 50 and 600℃. It was found that the undoped ZnO single crystals showed little gas sensitivity in air. and Na+-doping can greatly enhance the senstivity by increasing the resistivities. The maximum sensitivity of the samples is 2. (Ra/ Rg) for H2. 1 2.for CO and 4 for CH4

关键词： Preparation and Gas-sensing Characteristics of Na doped ZnO Single Crystals ZnO

Top 10 Influential Events in carbon neutrality and climate change response for 2.2.

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Frontiers in Energy 2024年第1期18卷 1-3页

作者： research Institute of Carbon Neutrality of Shanghai Jiao Tong university research Institute of Carbon Neutrality Shanghai Jiao Tong UniversityShanghai 200240China

In 2.2., the global community intensified its efforts towards achieving carbon neutrality and addressing climate change, witnessing several impactful events. research Institute of Carbon Neutrality, Shanghai Jiao Tong university compiled the Top 10 Events (in chronological order) in the field of global carbon neutrality and climate change response for 2.2., to share with readers these significant moments that document the ongoing ambition and collective efforts of human society.

关键词： neutral collective intensified

NONLOCAL THEORY STUDY ON FRACTURE TOUGHNESS OF CERAMIC materials

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Acta Metallurgica Sinica(English Letters) 1996年第4期9卷 256-262页

作者： X.H.Song(Centre for materials research and Analysis,{2. university of technology,{2. 430070,China )

The theoretical calculation formulas for the plane strain fracture toughness of mode Ⅰand Ⅱcracks of ceramic materials are deduced in this paper by using the nonlocal elasticity theory and maximum tensile stress criterion The deduced formulas, which are independent of crack geometry,bear a relation to material *** is shown through experiment that the theoretical value of fracture toughness is the lower limit of testing value. The theoretical calculation formulas for fracture toughness relate the macro-mechanical performance of materials with the micro-structural parameters and,therefore, are beneficial to fully understanding the physical mechanism of material rupture.

关键词： nonlocal elasticity theory fracture toughness,ceramic material

Modification of Fluorgypsum as Cement Retarder

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Journal of wuhan university of technology(materials Science) 2007年第4期22卷 745-748页

作者：王锦华 School of materials Science and Engineering Wuhan University of Technology

The chemical composition and mineral structure of fluorgypsum as well as its harm to application in cement were elaborately analyzed. The primary fluorgypsum was modified and its applications in cement＇s production were studied. The technological flow chart of preparing modified fluorgypsum was given. Experimental results indicate that hydration ratio the modified fluorgypsum through adding compound additive for 14d is about 70%. The modified fluorgypsum as cement retarder has certain stimulation to fly ash and increases the strength of compound cement. In addition, its adding amount is lower than that of natural gypsum. The modified fluorgypsum is a good substitute for natural gypsum.

关键词： fluorgypsum industry waste modification cement retarder

EPMA Study of the Interface of β-Tricalcium Phosphate Ceramies in Vivo

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Journal of materials Science & technology 2004年第6期20卷 657-661页

作者： Honglian DAI, Xianying CAO, Haichen SHAO, Chunhua SHEN and Shipu LIBiomedicaI materials and Engineering center,{2., wuhan 430070, China Biomed. Mat. and Eng. Ctr. Wuhan Univ. of Technol. Wuhan 430070 China

Electron probe and X-ray energy spectrum were used to investigate the chemical composition of the interface between material and new bone after porous tricalcium phosphate ceramie implanted in tibia of rabbits. The element changes of the interface, the materials transformation and the situation of new bone formation at different implantation period were observed. The results showed that the carbon element content decreased gradually in new bone tissue, and the content of calcium and phosphor element increased by degrees with the implantation time. At the same time, calcium-phosphor ratio in the new bone kept a higher Ievel. New bone grew into the materials interior, material dispersed and degraded simultaneously. Both composition of materials and new bone tended to be consentient. Finally, the materials were substituted by new bone. After implantation, not only the materials itself dissolved and degraded partially, but also new bone formed on the outer and pore surface of β-TCP porous bioceramics, which shovved that the degradation products of lifeless calcium phosphate inorganic materials took part in constituting of new bone tissue.

关键词： Calcium phosphate Electron probe Interface Chemical composition

Preparation of Filling Porous Osteoconduction materials and Its Animal Experiment Study

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Journal of wuhan university of technology(materials Science) 2011年第2期26卷 232-235页

作者：陈晓明 biomedical materials and Engineering {2. center Wuhan University of Technology

Titanium rods were processed into implant samples with cavity and groove in which was filled with HAP/β-TCP porous osteoconduction composite materials in order to increase the mechanical stability of the implant in *** phase compositions of the composite was characterized by X-ray diffraction （XRD） and scanning electron microscopy（SEM）.Histological evaluation showed that the biogradable composite could enhanced the ability of new bone *** composite can conduct new bone tissue growing into the cavities gradually after implanted into animal,and then achieve mechanical *** filling biogradable compound exhibited excellent biocompatibility,which combined with the new bone tissues tightly without inflammation and loosing.

关键词： β-tricalcium phosphate hydroxyapate filling osteoconduction titanium animal experiment