Determination of Triclocarban, Triclosan and Methyl-Triclosan in Environmental Water by Silicon Dioxide/Polystyrene Composite Microspheres Solid-Phase Extraction Combined with HPLC-ESI-MS

This paper developed a sensitive and efficient analytical method for triclocarban (TCC), triclosan (TCS) and Methyl-triclosan (MTCS) determination in environmental water, which involves enrichment by using silicon dioxide/polystyrene composite microspheres solid-phase extraction and detection with HPLC-ESI-MS. The influence of several operational parameters, including the eluant and its volume, the flow rate and acidity of water sample were investigated and optimized. Under the optimum conditions, the limits of detection were 1.0 ng/L, 2.5 and 4.5 ng/L for TCC, TCS, and MTCS, respectively. The linearity of the method was observed in the range of 5-2000 ng/L, with correlation coefficients (r2) >.99. The spiked recoveries of TCC, TCS and MTCS in water sampleswereachieved in the range of 89.5% -96.8% with RSD below 5.7%. The proposed method has been successfully applied to analyze real water samples and satisfactory results were achieved.

等温热压印法制备超疏水薄膜

以刷涂有疏水性SiO_2微球的筛网作为模具,通过等温热压印的方法,在聚乙烯(PE)塑铝复合薄膜上制备出超疏水表面。对压印压力、筛网目数、SiO_2微球直径等参数对制品表面微结构形貌和疏水性能的影响进行了研究。结果表明,该方法可以在PE塑铝复合薄膜表面构筑出具有良好疏水效果的二级复合微结构;在压力作用下,SiO_2微球会与PE基体共混形成复合体系,使得SiO_2微球与基体的连接更加稳定;增加热压印压力可以增大微米级结构的深度,但是过大的压力会导致SiO_2微球被PE覆盖,合理的压印压力应在8～12MPa之间;减小SiO_2微球的粒径可以进一步提高接触角数值;制品对水的接触角达到150°,滚动角低至1°,达到了超疏水的标准。

纳米聚乙烯/二氧化硅复合微球的制备

通过使用熔融乳液法将聚乙烯（PE）用表面活性剂聚乙烯-b-聚乙二醇嵌段共聚物（PE～b—PEG）乳化成纳米级胶束，同时采用溶胶-凝胶法将硅源水解并自组装到纳米PE胶束表面上，制备了纳米聚乙烯／二氧化硅复合微球．产物分别用纳米激光粒度仪、扫描电子显微镜（SEM）进行表征．实验结果表明：在适量的表面活性剂PE-b—PEG存在的条件下，复合微球的可控尺寸在30～190nm范围内，平均粒径为94nm．

缓蚀剂负载中空SiO2微球的制备及性能

以乳液聚合法制备的聚苯乙烯微球为模板制备中空介孔二氧化硅微球,经扫描电子显微镜、透射电子显微镜、热重分析、小角度X射线衍射、氮气吸附–脱附等手段对制备得到的中空微球进行性能结构表征。考察了氨水和硅源前驱体用量等制备条件对中空微球的尺寸、介孔孔径、球壳厚度等的影响,6.25 mL氨水和10 g正硅酸乙酯的用量为最佳制备条件。中空SiO2微球作为载体,负载缓蚀剂苯并三氮唑,并对负载缓蚀剂的微球表面进行高分子双电层的修饰,释放曲线实验表明,高分子双电层修饰使微球中缓蚀剂释放速率降低5倍。