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Calcium phosphate film was prepared by electrochemical deposition technology. Subsequently, the alkaline treatment process
of calcium phosphate film in 0.1 mol/L NaOH solution was monitored on real time by the piezoelectric quartz crystal impedance
(PQCI) technique. The variations of morphology and composition for the alkaline treatment products were characterized by scanning
electron microscopy (SEM), Fourier transform infrared (FT-IR) and X-ray diffraction (XRD), respectively. The dynamic variations
of calcium phosphate can be characterized by the change of equivalent circuit parameters. The results show that the forming
process of hydroxyapatite (HA) is composed of three stages: (1) acidic calcium phosphate dissolution; (2) phase transformation;
and (3) HA formation. Furthermore, the correlative kinetic equations and parameters are obtained by fitting the static capacitance
(C
s)—time curves.
Foundation item: Project(2005CB623901) supported by the Major State Basic Research and Development Program of China 相似文献
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有机硅改性环氧-聚氨酯乳液的合成与性能研究 总被引:4,自引:1,他引:3
以异佛尔酮二异氰酸酯(IPDI)、聚氧化丙烯二醇(PPG)、二羟甲基丙酸(DMPA)为主要原料,用4%的环氧树脂和3%的氨基硅烷复合改性合成了有机硅改性环氧-聚氨酯乳液,乳液外观呈黄白色且具有较好的稳定性。用红外光谱仪、接触角测定仪、热重分析仪对涂膜的结构和性能进行了检测,结果表明:聚合物中因环氧树脂的交联作用和Si—O键的存在,涂膜表面憎水性增强、耐水性和耐热性得到提高。 相似文献
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何德良 《中国新技术新产品》2010,(7):115-115
本文针对大体积混凝土的施工特点,从大体积混凝土的原材料质量要求、浇筑、振捣及养护方面进行分析施工过程中应注意的事项,从而确保大体积混凝土工程的施工质量。 相似文献
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环氧聚氨酯耐油涂料的研制 总被引:6,自引:0,他引:6
通过选择适当的聚酯树脂和环氧树脂,配以适当的异氰酸固化剂,研制了一种用于油箱的环氧聚氨酯耐油涂料。检测结果表明,该涂料具有良好的低温干燥性能、耐腐蚀性能,优异的耐油性能特别是耐高温油性能。该涂料将在各种工程设备的油箱中具有广阔的应用前景。 相似文献
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目的 制备一种在120~200℃内具有多种热致变色行为的不可逆示温涂层,用于快速排查和准确记录电网设备过热故障发生地点.方法 首先以碳酸钴和氯化钴为原料,用简单的溶液法在水中制备了两种钴基热致变色材料.再以有机硅WB300树脂作为成膜物,自制的两种材料和偏钒酸铵作为变色颜料,高速研磨4~5 h,获得变色涂料.通过XPS、XRD、FT-IR和SEM等测试手段对变色材料进行结构和微观形貌表征.于干燥箱加热观察涂层在120~200℃内的热色性,并用色差计和图像处理软件对变色点进行数据化处理.结果 结合XRD、XPS、FT-IR和TG等一系列表征,证明深绿色的三草酸合钴酸钾在130℃变为粉红色的草酸钴,玫瑰红色的磷酸钴铵在180℃变为深蓝色的磷酸氢钴.涂层附着力达到一级,耐冲击性为50 cm未出现涂层破裂,硬度为2H,在120~200℃具有5~6个变色点,并建立了色-温函数模型.结论 成功自制两种钴基热致变色材料.通过配色,成功制备了色差明显的多变色示温涂层,基本物理性能均满足常规涂层国家标准,涂层加热至200℃都变为黑色,不再改变. 相似文献
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The electrochemical behavior of CoCl2 in 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim]PF6) was investigated by cyclic voltammetry. The cyclic voltammograms were obtained from electrochemical measurement under different temperatures, and the reversible behavior for Co^2+/Co^3+ redox couple on glassy carbon electrode in [bmim]PF6 was confirmed by the characteristic of the peak currents. The diffusion coefficients (about 10^-11m^2/s) of Co^2+ in [bmim]PF6 under different temperatures were evaluated from the dependence of the peak current density on the potential scan rates in cyclic voltammograms. It is found that the diffusion coefficient increases with increasing temperature. Diffusion activation energy of Co^2+ in [bmim]PF6 is also calculated to be 23.4 kJ/mol according to the relationship between diffusion coefficient and temperature. 相似文献
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