共查询到17条相似文献,搜索用时 93 毫秒
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两种反相微乳液体系合成纳米羟基磷灰石的比较 总被引:2,自引:0,他引:2
制备了两种稳定的CTAB/正丁醇/正己烷/水体系和TritonX-100/正己醇/环己烷/水反相微乳液体系,研究了微乳液组份的浓度和比例对微乳液性质的影响,比较了两种反相微乳液体系的三元相图,用“微反应器”合成了纳米羟基磷灰石(HAP)粉体,比较了HAP颗粒在X-射线衍射、TEM、SEM表征中的异同。两种体系都表明反向微乳液法可以有效地控制和改变HAP的分散性和粒度大小。 相似文献
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以环己烷/H_2O/CTAB/正丁醇形成的反相微乳液体系为反应介质,其中,水相为调节Ce(NO_3)_3溶液pH值形成的溶胶,研究了Ce(NO_3)_3浓度、溶胶和反相微乳液体系的温度、反相微乳液体系pH值对CeO_2粒径的影响,并用XRD、激光粒度仪对样品进行了表征。结果表明,可以在1~100 nm内制备出粒径可控的CeO_2颗粒。控制Ce(NO_3)_3浓度为1.2 mol/L、溶胶和反相微乳液体系的温度为25℃、反相微乳液体系pH值为8,可得到D_(90)粒径在25~45 nm的CeO_2颗粒。 相似文献
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采用循环伏安法测定了以铁氰化钾为水相的司盘80/吐温80/正丁醇/异辛烷复配反相微乳液的扩散系数,并结合黏度测试,建立了推算复配反相微乳液液滴大小的新方法。测试结果表明,该复配反相微乳体系在工作电极上的电化学行为是扩散控制的可逆过程;推算结果表明,该复配反相微乳体系液滴都在纳米范围内,符合理论液滴大小,且液滴大小随含水量的变化规律可理论解释,证明了采用循环伏安法测定复配反相微乳液液滴大小的可行性。 相似文献
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反相微乳液法制备高溶度ZrO2陶瓷墨水(Ⅰ) 总被引:7,自引:0,他引:7
尝试采用新颖的反相微乳液法制备陶瓷墨水,为了获得高溶度陶瓷墨水,对反相微乳液体系优选进行研究,着重就Triton x-100/醇/烷/水体系,采用目测法,分光光度法,电导率法和离心分离法,分别考察了不同醇,烷配伍时体系的稳定性和相关物理性质,根据这些性质是否突变以确定体系是否发生相变,给出了体系拟三元相图。实验表明,在20℃时Triton x-100/正己醇/环己烷/水反相微乳液体系表现优异,当Triton x-100与正醇的质量比为3:2时达到最大范围的反相微乳液区,最大溶水量时的最佳组成为Triton x-100:正己醇:环己烷:水=19.1%:12.8%:23.7%:44.4%(质量比)。 相似文献
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采用电导率法,测定了以表面活性剂丁二酸-2-乙基己基磺酸钠(AOT)与甲基丙烯酸甲酯(MMA)和水构成的反相微乳液体系的稳定性,考察了油相极性、表面活性剂浓度、分散相浓度及离子价态、助乳化剂丙烯酰胺(AM)对反相微乳液体系的影响,确定了反相微乳液体系体系的局部相图,初步表征了反相微乳液体系的相结构。结果表明,以极性单体作为油相的微乳液体系电导率与增溶水量的变化关系中不存在突变点,有别于一般的以低极性或非极性烷烃(或混合烷烃)作为油相的微乳液体系。当体系中AOT浓度0.1~0.3 M,分散相(盐溶液)浓度≤0.05 M,增溶水量([H2O]/[AOT]摩尔比)w≤9时,可以得到稳定的反相微乳液体系,AM的存在能够增大体系的增溶能力。 相似文献
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Jiaqi Hu Haihui Zhou Guoping Zhang Yanqing Cui Liang Huang Yan Xu Jinhua Chen Yafei Kuang 《Journal of Applied Electrochemistry》2010,40(11):2033-2037
P-octyl polyethylene glycol phenyl ether (Triton X-100) and cetyltrimethylammonium bromide (CTAB) were mixed to be used as
surfactant for preparing reverse microemulsion with n-hexane, n-hexanol and water. Effects of weight ratio of the two surfactants, temperature, concentrations of water and cosurfactant
on the conductivity were studied. The results indicate that the conductivity of the mixed surfactants reverse microemulsion
is greatly higher than that of the single surfactant system. The reverse microemulsion has been modified to be with good conductivity.
The weight ratio of the two surfactants, temperature, concentrations of water and cosurfactant have obvious effects on the
conductivity of the reverse microemulsion. Furthermore, the electrochemical behavior of potassium ferricyanide [K3Fe(CN)6] in the mixed surfactants reverse microemulsion was investigated by cyclic voltammetry. The result shows that the redox processes
of
\textFe( \textCN ) 6 3- / \textFe( \textCN ) 6 4- {{\text{Fe}}\left( {\text{CN}} \right)_{ 6}}^{ 3- } / {{\text{Fe}}\left( {\text{CN}} \right)_{ 6}}^{ 4-} present good reversibility and are controlled by diffusion in the system. 相似文献
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简单介绍了微/纳米SiO2的优点和应用;阐述了反相微乳液中制备SiO2的反应原理和具体过程;结合近年来国内外文献综述了改变微乳液的参数对SiO2粒子的尺寸及形貌等的调控措施,并对反相微乳液法制备纳米材料的发展前景进行了展望。 相似文献
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超临界CO_2反相微乳体系的介观模拟研究 总被引:1,自引:0,他引:1
研究水/表面活性剂/超临界CO2(ScCO2)的结构自组装对于设计和应用基于ScCO2流体的反胶束微乳化过程有着重要的理论指导意义。文中采用耗散粒子动力学(DPD)模拟方法,对双链离子型表面活性剂[琥珀酸酯磺酸钠(d i-HCF4)]+水+CO2(溶剂)体系进行介观模拟。模拟观测了在ScCO2中表面活性剂不同组成下的聚集形态,以及反相微乳结构形成的动态过程,同时考察了微乳体系的相形态与温度和压力的关系。模拟结果表明:温度升高,有利于反相微乳结构的形成;压力升高,会破坏反相微乳结构。 相似文献
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Single-crystal hydroxyapatite (HAP) nanorods have been successfully synthesized by the reverse microemulsion method, and characterized by high-resolution transmission electron microscope (HRTEM), infrared spectra (IR), and powder X-ray diffraction (XRD). In this work, the feasibility of using quaternary reverse microemulsion (TX-100 + CTAB/n-butanol + n-hexanol/cyclohexane/water) to prepare hydroxyapatite nanorods with diameter 8–15 nm and length 25–50 nm, is described. The homogeneity in size and shape of hydroxyapatite nanoparticles observed by TEM is probably attributed to the different stabilization functions of different kinds of surfactant on the interfacial film. 相似文献
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TiO2 was synthesized by a reverse microemulsion route. By using different water contents in the reverse microemulsion, we obtained three different materials named R = 10, R = 20 and R = 30. The reverse microemulsion synthesis has the advantage that the kind of the crystalline titania structure obtained may be changed by simply modifying the water content in the microemulsion.The synthesized materials were characterized by nitrogen adsorption, scanning and transmission electron microscopy, and X-ray diffraction. Methylene blue (MB) was used as testing dye; we studied the pH effect and catalyst dosage in the MB photodegradation. The degradation kinetics was also studied. 相似文献