Applying the Langmuir-Blodgett Technique to a Well Defined Model Detergent System
Applying the Langmuir-Blodgett Technique to a Well Defined Model Detergent System
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将 Langmuir-Blodgett 技术应用于明确定义的模型洗涤剂系统
DOI：
10.1177/004051750107100603
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发表时间：
2001
影响因子：
2.3
通讯作者：
M. Tagawa
中科院分区：
文献类型：
--
作者：
K. Gotoh;N. Nakazawa;M. Tagawa
采用Langmuir-Blodgett技术得到了定义良好的模型洗涤剂体系。将花生酸作为模型有机污染物的单层扩散膜转移到未经处理的玻璃板上，并用两种硅烷偶联剂γ-氨丙基三乙氧基硅烷(APTES)和甲基三乙氧基硅烷(MTES)处理。布鲁斯特角显微镜图像显示，花生四烯酸的LB膜均匀沉积在衬底上。将含有LB膜的玻璃板在不同的水溶液中进行超声清洗，并通过清洗后基板的FTIR光谱变化来评价清洗能力。玻璃的硅烷化降低了去污效率，尤其是APTES处理后的玻璃。底物的润湿性和表面电荷对去污力起重要作用，表明花生四烯酸的LB膜是直接从底物上去除的。APTES处理的玻璃对LB膜的脱除量随表面活性剂或乙醇浓度的增加而增加，且脱除率强烈依赖于温度。作为无需洗涤液的去除技术，还尝试了将具有LB膜的衬底暴露在172 nm紫外光下。
The Langmuir-Blodgett technique is used to obtain a well defined model detergent system. Spreading monolayers of arachidic acid as a model organic contaminant are transferred onto glass plates untreated and treated with two silane coupling agents, γ-aminopropyltriethoxysilane (APTES) and methyltriethoxysilane (MTES). Brewster angle microscopic images show that the LB films of arachidic acid are uniformly deposited on the substrate. Glass plates with the LB films are ultrasonically washed in various aqueous solutions, and the detergency is evaluated from the change in FTIR spectra of the substrate due to washing. The efficiency of detergency decreases as a result of the silanization of glass, especially for the APTES treated glass. The wettability and the surface charge of the substrate play important roles in the detergency, suggesting that the LB films of arachidic acid are removed directly from the substrate. Removal of LB films from the APTES-treated glass increases with increasing surfactant or ethanol concentration, and the removal rate strongly depends on temperature. As a removal technique without washing liquids, exposure of the substrates with LB films to 172 nm ultraviolet light is also attempted.