共查询到20条相似文献,搜索用时 171 毫秒
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以不锈钢网为基材,利用单宁酸对不锈钢网进行表面预处理并功能化接枝两性离子基团,制备了新型亲水和水下超疏油的单宁酸/两性离子改性油-水分离膜(TA-ZW-SSM).利用X射线光电子能谱仪(XPS)、扫描电子显微镜(SEM)及接触角测量仪等表征了其化学结构、形态和润湿性.研究结果表明,两性离子基团通过化学键接枝在单宁酸预处理的不锈钢网表面.油-水分离实验结果表明,对于不同类型的油-水混合物,本文制备的超亲水和水下超疏油特性的TA-ZW-SSM可实现重力驱动的高效油-水分离,并具有较好的化学稳定性及再循环性. 相似文献
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通过层层静电自组装法将溶菌酶和聚苯乙烯磺酸钠(PSS)交替沉积在羊毛纤维表面, 赋予其抗菌性. 应用扫描电镜(SEM)考察组装后纤维表面形态, Zeta电位、染色、溶菌酶活性测试研究纤维表面组装机制并考察改性羊毛抗菌效果. SEM结果表明组装后纤维表面粗糙, 部分凹槽被填埋, 证明溶菌酶/PSS自发组装到纤维表面. 表面电位、染料上染量、溶菌酶活力随纤维表面沉积物质不同, 均呈现明显的“层层交替振荡”现象, 证实了组装后纤维表面电荷的交替变化|织物紫外线透过率随组装层数增加呈近似线性降低, 表明溶菌酶在羊毛表面实现了多层组装, 揭示了羊毛纤维表面抗菌功能涂层的层层静电自组装构筑机制. 同时, 组装层数增多, 溶菌酶活性逐渐增大. 载酶羊毛抗菌率达到91.7%, 具有良好的抗菌性能. 相似文献
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甲基磺酸对PBO纤维的表面改性 总被引:1,自引:0,他引:1
采用甲基磺酸(MSA)溶液对PBO纤维表面进行化学改性,用单丝拔出试验测定了改性前后PBO纤维与环氧树脂基体的界面剪切强度,并通过扫描电镜(SEM)、X-射线光电子能谱(XPS)、接触角分别对处理前后纤维的表面形貌、表面组成以及表面自由能进行了表征.研究结果表明:在甲基磺酸质量分数为60%的溶液中,60℃下处理6 h的PBO纤维与环氧树脂基体的界面剪切强度比未处理的提高了81%,并且纤维表面O元素的质量分数增加了13.3%,表面自由能增加了17.3%.当溶液中甲基磺酸的质量分数、处理时间和处理温度进一步提高时,PBO纤维的皮层将遭受破坏,导致界面剪切强度下降. 相似文献
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采用谷氨酸与硅烷偶联剂(KH-792)缩合反应,制备出一种含酰胺基的硅烷偶联剂,利用其与材料之间的化学结合,将谷氨酸共价固定至磷灰石-硅灰石生物玻璃陶瓷表面,实现表面改性。将改性后的磷灰石-硅灰石生物玻璃陶瓷与人骨肉瘤细胞MG63共培养,评价其体外细胞生物相容性。应用FTIR、SEM、XPS等测试技术分别对合成的偶联剂、改性后的陶瓷材料进行结构、表面形貌及细胞生长情况的表征,结果表明:谷氨酸与KH-792的反应产物有酰胺基生成;含酰胺基的硅烷偶联剂能对磷灰石-硅灰石生物玻璃陶瓷表面进行有效改性;共培养3 d后细胞在材料材料表面大量贴附,MTT实验也证明增殖良好,即含酰胺基的硅烷偶联剂能改善磷灰石-硅灰石生物玻璃陶瓷的体外细胞生物相容性。 相似文献
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型胶原在聚-L-乳酸(PLLA)表面的化学接枝和涂层及其对软骨细胞生长的促进作用 总被引:5,自引:0,他引:5
采用接枝-涂层技术在聚-L-乳酸(PLLA)膜表面接枝聚甲基丙烯酸(PMAA)得到稳定的PLLA-g-PMAA胶原涂层.利用水溶性碳化二亚胺作为缩合剂,使PLLA-g-PMAA表面的羧基和胶原分子中的氨基发生缩合反应,从而将型胶原接枝在PLLA表面;同时保留材料表面物理涂层的胶原溶液,获得了稳定的胶原涂层.XPS谱图证实了接枝反应的发生.分别用比色法和茚三酮法测定了PLLA-g-PMAA表面的羧基密度和PLLA膜表面胶原的接枝量和涂层量.细胞培养结果表明,改性后的PLLA膜表面软骨细胞的铺展性能和增长速度明显改善. 相似文献
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采用接枝 -涂层技术在聚 -L-乳酸 ( PLLA)膜表面接枝聚甲基丙烯酸 ( PMAA)得到稳定的 PLLA-g-PMAA胶原涂层 .利用水溶性碳化二亚胺作为缩合剂 ,使 PLLA-g-PMAA表面的羧基和胶原分子中的氨基发生缩合反应 ,从而将 型胶原接枝在 PLLA表面 ;同时保留材料表面物理涂层的胶原溶液 ,获得了稳定的胶原涂层 . XPS谱图证实了接枝反应的发生 .分别用比色法和茚三酮法测定了 PLLA-g-PMAA表面的羧基密度和 PLLA膜表面胶原的接枝量和涂层量 .细胞培养结果表明 ,改性后的 PLLA膜表面软骨细胞的铺展性能和增长速度明显改善 . 相似文献
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Yannick Coffinier Gaëlle Piret Manash R. Das Rabah Boukherroub 《Comptes Rendus Chimie》2013,16(1):65-72
The article reports on the wetting properties of silicon-based materials as a function of their roughness and chemical composition. The investigated surfaces consist of hydrogen-terminated and chemically modified atomically flat crystalline silicon, porous silicon and silicon nanowires. The hydrogenated surfaces are functionalized with 1-octadecene or undecylenic acid under thermal conditions. The changes occurring upon surface functionalization are characterized using Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS) spectroscopy and water contact angle measurements. By increasing the surface roughness, the static water contact angle increases. The combination of high surface roughness with chemical functionalization with water repellent coating (1-octadecene) enables reaching superhydrophobicity (water contact angle greater than 150°) for silicon nanowires. 相似文献
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Weiwei Li Li Meng Lun Wang Jingshan Mu Qiwei Pan 《Surface and interface analysis : SIA》2016,48(12):1316-1319
Ultra‐high molecular weight polyethylene (UHMWPE) fibers were modified by chromic acid. The effects of surface modification were evaluated with Fourier transform infrared spectroscopy (FTIR), X‐ray photoelectron spectroscopy (XPS), contact angle measurement, and scanning electron microscope (SEM). The results showed that both the content of O‐containing functional groups and surface roughness of modified fibers increased. The polar groups on the modified fiber surface decreased the contact angles with water and ethylene glycol, as evidenced by contact angle measurement. The tensile test results showed the strength and the elongation at break of UHMWPE fibers decreased but the modulus increased after chromic acid modification. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
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Rossana M. S. M. Thiré Taíla O. Meiga Sabrina Dick Leonardo R. Andrade 《Macromolecular Symposia》2007,258(1):38-44
Summary: Chemical modification of polymer surface may potentially be used to create smart materials that can guide cellular adhesion, proliferation and maintenance of specific expression of molecules. The microbial polyester poly (3-hydroxybutyrate) (PHB) has been attracted attention as promising material for applications in tissue engineering. In this work, a wet-chemical method, base ethylenediamine aminolysis, was performed to improve the adhesion of chondrocytes isolated from human articular cartilage to PHB films. The effects of chemical treatment on PHB films was evaluated by following changes in morphology and surface chemical composition using atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS), respectively. While the effect on cells morphology was studied by scanning electron microscopy (SEM). The treatment with ethylenediamine did not change significantly the morphology of the structures of PHB films surface. However, the roughness of the aminolyzed films was slightly higher. The introduction of nitrogen-containing groups was confirmed by XPS. In vitro experiments indicated that the surface modification did not have toxic effects in cells, since they could adhere and proliferate on modified PHB films. It was observed that long-time treatment improved ability of PHB films to support cell growth, which could be accounted to physicochemical and topological effects. 相似文献
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H. Thelen R. Kaufmann D. Klee H. Höcker 《Fresenius' Journal of Analytical Chemistry》1995,353(3-4):290-296
The aromatic polyethersulphone (PES) is a well known polymer for the preparation of membranes with excellent thermal stability and chemical resistance. The disadvantage of PES-membranes is their hydrophobic character, which in contact with protein containing solutions leads to high protein adsorption and as a consequence to deterioration of membrane properties. In this report the surface modification of PES by means of glow discharge induced grafting of 2-hydroxyethyl methacrylate (HEMA) is described. Graft polymerisation creates a largely wettable layer of poly(2-hydroxyethyl methacrylate) (PHEMA) on the surface of PES. This has been shown by contact angle measurements using the Wilhelmy plate method. Chemical characterization is carried out by means of X-ray photoelectron spectroscopy (XPS) and infrared spectroscopy/attentuated total reflection (FTIR-ATR). The influence of storage conditions on the surface properties of modified PES samples has been investigated after storage in vacuum, water, and air. 相似文献
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The aromatic polyethersulphone (PES) is a well known polymer for the preparation of membranes with excellent thermal stability and chemical resistance. The disadvantage of PES-membranes is their hydrophobic character, which in contact with protein containing solutions leads to high protein adsorption and as a consequence to deterioration of membrane properties. In this report the surface modification of PES by means of glow discharge induced grafting of 2-hydroxyethyl methacrylate (HEMA) is described. Graft polymerisation creates a largely wettable layer of poly(2-hydroxyethyl methacrylate) (PHEMA) on the surface of PES. This has been shown by contact angle measurements using the Wilhelmy plate method. Chemical characterization is carried out by means of X-ray photoelectron spectroscopy (XPS) and infrared spectroscopy/attentuated total reflection (FTIR-ATR). The influence of storage conditions on the surface properties of modified PES samples has been investigated after storage in vacuum, water, and air. 相似文献
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Xinlei Gao Li Wu Jian Li Wanzhen Gao Meng Hua 《Journal of Dispersion Science and Technology》2013,34(10):1422-1427
A successful preparation of a Schiff base copper complex was carried out directly in rap oil, using a W/O microemulsion reactor. The prepared Schiff base copper complex dispersed equably and spontaneously in the oil. Owing to a modification of the rap oil, by addition of 2%wt of Cu (II) chelate of bissalicylaldehyde-ethylenediamine, the friction coefficient decreased by 80% compared to that of the original one. It was verified by energy dispersive spectroscopy (EDS) and x-ray photoelectron spectroscopy (XPS) analyses that steel/steel rubbing pairs underwent a selective transferring process with such modified lubricants. It was suggested that the mechanism for the improvement in the tribological characteristics of the modified lubricants was due to a selective transferring effect. The Cu (II) chelate of bissalicylaldehyde-ethylenediamine not only served as an additive in the rap oil, but also self-assembled on the surface of the 100Cr6 steel. The self-assembled monolayer (SAM) was examined using SEM techniques. The SAM was characterized with cyclic voltammetry (CV). It indicated that the SAM could activate the rubbing surface of 100Cr6 steel, which benefited the tribological chemical reaction. 相似文献
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Courtois J Szumski M Byström E Iwasiewicz A Shchukarev A Irgum K 《Journal of separation science》2006,29(1):14-24
Based on a survey of the literature on pretreatment of fused silica capillaries, 3 etching procedures and 11 silanization protocols based on the vinylic silane 3-((trimethoxysilyl)propyl) methacrylate (gamma-MAPS) were found to be most representative as a means of ensuring attachment of in situ prepared vinylic polymers. These techniques were applied to fused silica capillaries and the success in establishing the intended surface modification was assessed. X-ray photoelectron spectroscopy (XPS) was used to characterize the chemical state of the surface, providing information regarding presence of the reagent bound to the capillary. Wetting angles were measured and correlated with the XPS results. An adherence test was done by photopolymerization of a 2 mm long plug of 1,6-butanediol dimethacrylate in the prepared capillaries and evaluation of its ability to withstand applied hydraulic pressure. SEM was also performed in cases where the plug was released or other irregularities were observed. Finally, the roughness of the etched surface, considered to be of importance, was assessed by atomic force microscopy. Alkaline etching at elevated temperature provided a surface roughness promoting adhesion. The commonly used silanization protocols involving water in the silanization or washing steps gave inadequate surface treatment. The best silanization procedure was based on toluene as a solvent. 相似文献
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Muhammad Zakir B.D.S MSc PhD Taina Laiho Sari Granroth Edwin Kukk Chun Hung Chu James Kit-Hon Tsoi Jukka Pekka Matinlinna 《Surface and interface analysis : SIA》2022,54(7):747-758
This laboratory study aimed to compare, contrast, and evaluate the effect of a novel dual surface modification method on the adhesion strength of resin composite cement to titanium. C.p.-2 grade titanium samples were silica-coated, etched with HNO3(69vol %) or a blend of HCl (35vol %) and H3PO4 (85vol %), for 1 h at 80°C. Surface roughness was measured by surface roughness profilometry, topographic analysis by scanning electron microscopy (SEM), atomic force microscopy (AFM), and surface analyses by energy dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS). Silanization of all specimens was carried out after SEM, EDX, and AFM analysis, before enclosed mold microshear bond strength testing (EM-μSBS). Adhesion strengths were measured after artificial ageing: 1 day, 1 week, 4 weeks, and 8 weeks by EM-μSBS testing and failure mode analysis by optical microscopy. Polished titanium was used as a control. The highest surface roughness was observed in titanium samples treated with silica-coating + HCl-H3PO4 etching. The elemental composition confirmed the presence of Ti, O, C, with Si and Al in samples treated with silica-coating. A gradual decrease in EM-μSBS values was observed in all titanium samples with adhesive and cohesive failure modes. The novel dual surface modification method applied in this study suggests that silica-coating + HCl-H3PO4etching strongly affects titanium surface topography and roughness. The presence of Si on silica-coated surface modified titanium before silanization with an experimental silane has a positive effect on the EM-μSBS of titanium samples treated with silica-coating only or silica-coating + HNO3 etching. 相似文献
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Chong Ding Yihe Zhang Na Zhang Xinke Wang Qi Wei Youpeng Zhang 《Surface and interface analysis : SIA》2020,52(10):645-655
In this study, surface modification of coal gangue (CG) was performed with titanate coupling agent 201 (isopropyl tri(dioctylpyrophosphate) titanate), and the effects of surface modifier on mechanical properties and thermal stability of high-density polyethylene filled with CG (HDPE/CG) and high-density polyethylene filled with modified CG (HDPE/mCG) composites were investigated. The coupling agent was successfully grafted on CG surface through chemical reaction according to the analyses of Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS), and the coupling agent can effectively enhance the hydrophobicity of surface that was verified by water contact angle beyond 90° of modified CG sample. With the introduction of coupling agent, some enhancements of tensile strength, flexural strength, and impact strength were observed in HDPE/mCG compared with HDPE/CG, due to the improved compatibility between mCG fillers and matrix. The increased storage modulus and decreased loss factor of HDPE/mCG composite further confirm the stronger interface adhesion after modification. Moreover, it is found that titanate coupling agent 201 can improve the thermal stability of HDPE/mCG composite to some extent. 相似文献
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Minhong Xu Guoxiang Pan Yongyong Cao Yuhua Guo Haifeng Chen Yongya Wang Yunfeng Wu 《Surface and interface analysis : SIA》2020,52(10):626-634
In order to widen the application of iron oxide yellow pigments (α-FeOOH) in high temperature industry, α-FeOOH coated with calcium phosphate (α-FeOOH/Ca) were modified with stearic acid (Sa) through dry process. Scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), and thermogravimetry (TG) were employed to characterize the effect of surface modification. The effects of Sa dosage on the thermal resistance of α-FeOOH/Ca after modification were also discussed. The crystal structure of α-FeOOH/Ca does not change after modification with Sa, but the ratio of length to diameter about α-FeOOH/Ca is smaller. Sa can react with α-FeOOH/Ca in the form of –COOCa and HPO42− based on FT-IR and XPS analyses. TG-DTG results suggest that calcium phosphate and Sa improve the thermal stability of α-FeOOH. The value of color difference of modified α-FeOOH/Ca first decrease and then increase with increasing of Sa dosage, which is studied by CIE ΔL, Δa, and Δb colorimetric analyses. The amount of Sa affects the thermal resistance and dispersion performance of α-FeOOH/Ca simultaneously; also the relationship between thermal resistance and dispersion is inversely proportional. Experimental characterizations reveal that introduction of the phosphates and Sa not only prevents the loss of water on the surface of α-FeOOH but improve its activation index and dispersibility in organic solvents. 相似文献