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surface modification of Hydroxyapatite by Using γ-aminopropyl Silane

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Journal of Wuhan University of Technology(Materials Science) 2001年第3期16卷 37-38页

作者：张胜民 School of Materials Sci. and Eng. Wuhan University of Technology Wuhan 430070 China

surface modification of hydroxyapatite(HA)powder was performedwith r-aminopropyl silane in toluent solvent. The modificationeffects were characterized by using XPS and FT-IR methods. Theresults indi- cated that the P2p electron binding energy of themodified HA decrease 0.4 eV compared to that of HA. Further- more, anew peak, 998 cm^-1 absorption appeared in IR differential spectra ofmodified HA and HA, which is due to a stretching vibration ofstructure P-O-Si, meaning that a direct covalent bonding betweenhydroxyl group on HA surface and the organic silane molecule wasrealized after modification, and the chemical bonding type was P-O-Si.

关键词： Biomaterial hydroxyapatite surface modification

surface modification of Nanometer Silica by N, N'-dicyclohexyl- carbodiimide Mediated Amidation

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Chinese Chemical Letters 2001年第10期12卷 933-934页

作者： Guo, ZX Yu, J Yu, J Tsing Hua Univ Dept Chem Engn Inst Polymer Sci & Engn Beijing 100084 Peoples R China

A potentially versatile procedure for surface modification of nanometer silica is illustrated by N, N′-dicyclohexylcarbodiimide (DCC) mediated amidation of stearic acid.

关键词： Nanometer silica surface modification DCC acid amidation.

surface modification with ionic liquid for efficient CsPbI2Br perovskite solar cells

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Journal of Materiomics 2021年第5期7卷 1039-1048页

作者： Xingyu Pu Jian Han Shuangjie Wang Hui Zhou Qi Cao Jiabao Yang Ziwei He Xuanhua Li State Key Laboratory of Solidification Processing Center for Nano Energy MaterialsSchool of Materials Science and EngineeringNorthwestern Polytechnical UniversityXián710072China Northwestern Polytechnical University-Queen Marry University of London(NPU-QMUL)Joint Research Institute of Advanced Materials and Structures(JRI-AMAS)Xián710072China

The presence of numerous trap states on the perovskite surface severely affects the performance of inorganic CsPbI_(2)Br perovskite solar *** modification has been proven to be an effective strategy to passivate the surface trap states of CsPbI_(2)Br ***,most modifiers behave high volatility and insulation,not enough to further develop the CsPbI_(2)Br solar ***,an ionic liquid of 1-viny-3-propionate ethyl imidazolium chloride([PEVIM]Cl)is applied to modify the CsPbI_(2)Br film surface,yielding a compact film with enhanced *** surface trap states of CsPbI_(2)Br film are effectively passivated via the interaction between carbonyl group of[PEVIM]Cl and uncoordinated metal cations of CsPbI_(2)Br perovskite,leading to charge recombination suppression and charge transport ***,the power conversion efficiency(PCE)of[PEVIM]Cl modified CsPbI_(2)Br device is obviously enhanced from 12.49% to 14.19% with an improved open-circuit voltage of 1.160 ***,the non-encapsulated device presents excellent thermal stability,still maintaining 91%PCE when heated at 85℃ in nitrogen atmosphere for 360 ***,the non-encapsulated device degrades only 11% PCE after stored at 50% relative humidity for 960 *** simple and efficient approach provides a promising direction to fabricate high-efficiency and stable inorganic perovskite devices.

关键词： Inorganic perovskites CsPbI_(2)Br Ionic liquid surface modification High efficiency

surface modification for Metal Hydride Electrode of Ni/MH Battery

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Journal of Beijing Institute of Technology 2005年第1期14卷 75-78页

作者：杨凯吴锋李丽陈实 School of Chemical Engineering and Environment Beijing Institute of Technology Beijing100081 China School

A novel method was applied to the surface modification of the metal hydride (MH) electrode of the Ni/MH battery. The electrode was plated with a thin silver film by using plasma technology and its effect on the performance of the Ni/MH battery was examined. Charge-discharge test proved that the battery with modified electrode exhibits a better high-rate dischargeability and chargeability than the battery with untreated electrode. The battery with modified electrode exhibits satisfactory durability. After 500 cycles, the capacities of the batteries with modified and unmodified electrode are 90.1% and 82.3% of their original capacities. The inner pressure test shows that the battery with modified electrode displays a much lower inner gas pressure on charging. The experimental results demonstrate that this method is an effective way for the surface modification of the electrode of the Ni/MH battery.

关键词： surface modification plasma technology electrode Ni/MH battery

surface modification of biomaterials by photochemical immobilization and photograft polymerization to improve hemocompatibility

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Frontiers of Chemical Science and Engineering 2010年第3期4卷 372-381页

作者： Yakai FENG Haiyang ZHAO Li ZHANG Jintang GUO School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072China

Thrombus formation and blood coagulation are serious problems associated with blood contacting products,such as catheters,vascular grafts,artificial hearts,and heart *** progresses and strategies to improve the hemocompatibility of biomaterials by surface modification using photochemical immobilization and photograft polymerization are reviewed in this *** approaches to modify biomaterial surfaces for improving the hemocompatibility,i.e.,bioinert surfaces,immobilization of anticoagulative substances and biomimetic surfaces,are *** biomimetic amphiphilic phosphorylcholine and Arg-Gly-Asp(RGD)sequence are the most effective and most often employed biomolecules and peptide sequence for improving hemocompatibility of material *** RGD sequence can enhance adhesion and growth of endothelial cells(ECs)on material surfaces and increase the retention of ECs under flow shear stress *** surface modification is a promising strategy for biomaterials especially for cardiovascular grafts and functional tissue engineered blood vessels.

关键词： anticoagulative biomimetic biomaterials hemocompatibility phosphorylcholine photochemical immobilization photograft polymerization photolinker surface modification

surface modification and Model of Glassy Cementitious Materials

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Wuhan University Journal of Natural Sciences 2000年第4期5卷 491-496页

作者： Ma Bao-guo, Li Yong-xin, He Xing-yang, Chen You-zhi College of Materials Secience and Engineering,Wuhan University of Technology Wuhan, 430070,China College of Materials Secience and Engineering Wuhan University of Technology Wuhan430070China

Basic theory of surface modification about glassy cementitous materials is presented. At the same time modified glassy cementitous materials were manufactured by means of point activation and disperse and grind aid according to technology of mechanical-chemistry. This theory about surface modification has been proved by some experimental results such as SEM, size distribution, fluidity of the paste, physical-mechanical properties of the hardened paste and heat of the hydration. The particle size of modified fly ash is tending to become smaller and the shape of microfine particles seems a ball; strength of modified glassy cementitous materials and ordinary portland cement compound paste has a obvious increment and fluidity of the paste also has a noticeable improvement; surface modification also can accelerate the formation of paste structure to a certain degree. Besides a model about the interactive mechanism of modified glassy cementitous materials and ordinary portland cement is put forward.

关键词： glassy eementitous materials surface modification point activation grind aid model

surface modification of biodegradable magnesium and its alloys for biomedical applications

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Regenerative Biomaterials 2015年第2期2卷 135-151页

作者： Peng Tian Xuanyong Liu State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050PR China

Magnesium and its alloys are being paid much attention recently as temporary implants,such as orthopedic implants and cardiovascular ***,the rapid degradation of them in physiological environment is a major obstacle preventing their wide applications to date,which will result in rapid mechanical integrity loss or even collapse of magnesium-based implants before injured tissues ***,rapid degradation of the magnesium-based implants will also cause some adverse effects to their surrounding environment,such as local gas cavity around the implant,local alkalization and magnesium ion enrichment,which will reduce the integration between implant and ***,in order to obtain better performance of magnesium-based implants in clinical trials,special alloy designs and surface modifications are ***,when a magnesium-based implant is inserted in vivo,corrosion firstly happens at the implant-tissue interface and the biological response to implant is also determined by the interaction at this *** the surface properties,such as corrosion resistance,hemocompatibility and cytocompatibility of the implant,are critical for their in vivo *** with alloy designs,surface modification is less costly,flexible to construct multi-functional surface and can prevent addition of toxic alloying *** this review,we would like to summarize the current investigations of surface modifications of magnesium and its alloys for biomedical *** advantages/disadvantages of different surface modification methods are also discussed as a suggestion for their utilization.

关键词： magnesium alloys surface modification coatings ion implantation biodegradability biocompatibility

surface modification of Polyglycolic Acid Fibers by Hydrogen Peroxide for Enhancing Hydrophilicity and Cytocompatibility

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Journal of Donghua University(English Edition) 2017年第6期34卷 768-773页

作者：王碧峤张佩华赵莉何晨光 College of Textile and Clothing Dezhou UniversityDezhou 253023China College of Textiles Donghaa UniversityShanghai 201620China Shanghai Jurui Biomaterials Limited Company Shanghai 200241China

Hydrogen peroxide( H_2O_2) is applied for surface modification of polyglycolic acid( PGA) fibers in order to enhance the hydrophilicity and cytocompatibility of PGA fibers effectively,and maintain the breaking strength as the same time. PGA fibers are dipped in H_2O_2 solution a certain time for modification. Scanning electron microscopy( SEM) was used to observe the surface morphology of PGA fibers before and after modification. The varying of PGA macromolecule was examined with Fourier transform infrared spectroscopy( FTIR) analyses. X-ray diffraction( XRD) and differential scanning calorimetry( DSC) analysis showed that crystallinity slightly decreases. Mechanical performance test showed tensile force of modified PGA fiber was increased. The water contact angle test indicated the improving of hydrophilic. A cell proliferation assay showed that fibroblast cells attach and proliferate well on the fibers, which meant the modified fibers possess good cytocompatibility. These results suggest that H_2O_2 surface modification is easy to operate and a advantageous modification method for PGA fibers.

关键词： polyglycolic acid(PGA) hydrogen peroxide(H2O2) surface modification hydrophilicity cytocompatibility

Etching characteristics and surface modification of InGaSnO thin films under Cl_(2)/Ar plasma

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Plasma Science and Technology 2023年第10期25卷 91-96页

作者： Young-Hee JOO Jae-Won CHOI Bo HOU Hyuck-In KWON Doo-Seung UM Chang-Il KIM Department of Electronic and Electrical Engineering Chung-Ang UniversitySeoul 06974Republic of Korea Department of Firearms and Optics Daeduk UniversityDaejeon 34111Republic of Korea School of Physics and Astronomy Cardiff UniversityCardiff CF243AAUnited Kingdom Department of Electrical Engineering Sejong UniversitySeoul 05006Republic of Korea

Indium gallium tin oxide(IGTO)thin films have the potential for high mobility and lowtemperature processing,which makes them suitable for applications such as display backplanes and high-voltage switching ***,very few studies have investigated the plasmaetching characteristics of IGTO and changes in its properties after *** this study,the etching characteristics of IGTO were investigated using Cl_(2)/Ar plasma,and changes in surface properties were *** showed that the etch rate increased with an increase in the proportion of Cl_(2),with the highest etch rate observed at 69 nm min^(-1)in pure Cl_(2)plasma with a gas flow rate of 100 ***,increased radio-frequency power caused a rise in the etch rate,while a process pressure of 15 m Torr was *** primary etching mechanism for IGTO thin films under Cl_(2)plasma was a chemical reaction,and an increased work function indicated the occurrence of defects on the *** addition,the etching process reduced the surface roughness of Cl_(2)-containing plasma,whereas the etching process in pure Ar plasma increased surface *** study contributes to a better understanding of the plasmaetching characteristics of IGTO and changes in its properties after etching,providing valuable insights for IGTO-based applications.

关键词： InGaSnO Cl2-based plasma etching mechanism surface modification plasma etching