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异羟肟酸比色法测定电解混合液中葡萄糖酸的含量 总被引:2,自引:0,他引:2
本文报导用异羟肟酸比色法,分析葡萄糖电解氧化制备葡萄糖酸盐过程的电解混合液中葡萄糖酸根含量的研究结果,文中对实验条件及影响因素进行了探讨。实验证明,本方法具有分析方法简单、分析数据稳定、重现性好、可靠、方便等特点。 相似文献
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钛/羟基磷灰石涂层的电沉积过程及其结构特征 总被引:18,自引:1,他引:17
采用电沉积方法在钛金属基底上形成磷酸钙盐涂层,涂层经低温碱液处理获取羟基磷灰石涂层。研究了电流密度、主盐浓度、电解液温度、沉积电量、低温碱液处理对涂层表面形貌的影响,并用SEM、ZRD和IR对涂层的组成和结构进行分析。结果表明:电沉积磷酸钙盐涂层经低温碱液处理后得到纯的羟基磷灰石涂层,羟基磷灰石晶体呈针状结构;随电流密度、主盐浓度的增加,晶粒变粗,随电解液温度的升高,晶体发生变化,出现鳞片状结构;涂层质量随沉积电量的增加而增长。 相似文献
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芦荟是一种含有较为丰富的营养物质的天然植物,其生物活性成份复杂多样,主要含有多糖、氨基酸、有机酸、维生素等多种营养成分近年来,人们发现多糖具有抗感染、抗癌、增强免疫力及保健、美容、药用等功效[1,2],因此芦荟多糖的研究也是近年研究热点之一,在多糖的分离、纯化、组分测定和结构分析等技术上取得进展[3,4].本文报道用分光光度法测定芦荟中多糖含量的方法. 相似文献
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电沉积HA/TiO2复合涂层的结合强度和热稳定性研究 总被引:6,自引:0,他引:6
HA/TiO2 composite coating were fabricated via adding TiO2 powder in the electrolyte by electrodeposition. The influence of current density and deposition time on the content of TiO2 in the coating, the influence of the content of TiO2 in the coating on the bonding strength of coating and the influence of sintering temperature on the structure and the bonding strength of coating were investigated. The experiment results show that the content of TiO2 in the coating increase with reducing the current density and prolonging the deposition time, the bonding strength improve with increasing the content of TiO2 in the coating, which can obtain 18.7 MPa when the weight percent TiO2 in the coating attain 72.2 %. The addition of TiO2 in the coating reduces the thermal expansion coefficient of the coating, improves the bonding strength of coating and changes the fracture mechanism of the coating from adhesion failure to cohesive failure. HA in the composite coatings is decomposed by the catalysis reaction of TiO2 at the temperature of sinter 850 ℃. Differential scanning calorimetry and X-ray diffractometry analyses showed that the chemical reaction between HA and TiO2 lead to the product are α-TCP and CaTiO3 at the temperature of sinter 1200 ℃. In order to prevent the coating from decomposing and attain hign bonding strength, the sintering temperature should be less than 820 ℃. 相似文献
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水热电沉积羟基磷灰石涂层的研究 总被引:9,自引:0,他引:9
在0.0105mol/LCa(NO3)2,0.0063mol/LNH4H2PO4,0.1mol/LNaNO3,pH=4.6的电解液中,控制温度60~200℃,恒电流0.4mA/cm2,通过水热电沉积法制备羟基磷灰石涂层.实验结果表明,涂层晶体端面呈六边形棒状结构,涂层组分为缺钙磷灰石Ca10-x(HPO4)x(PO4)6-x(OH)2-x.经800℃烧结后涂层分解为HA和β-TCP的混合物.随温度升高,涂层n(Ca)/n(P)不断增大,涂层组分逐渐接近计量比的HA.涂层质量和结合强度随温度升高先增后减,在160℃时达到最大值16.7MPa 相似文献
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