Coupled laser molecular trapping, cluster assembly, and deposition fed by laser-induced Marangoni convection
Coupled laser molecular trapping, cluster assembly, and deposition fed by laser-induced Marangoni convection
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DOI：
10.1364/oe.16.005673
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发表时间：
2008-04-14
期刊：
影响因子：
3.8
通讯作者：
Misawa, Hiroaki
中科院分区：
文献类型：
--
作者：
Louchev, Oleg A.;Juodkazis, Saulius;Misawa, Hiroaki
基于光强分布的模拟和马兰戈尼对流引起的热量和质量传递的数量级分析，提出了激光镊子在水溶液薄膜中分子聚集的耦合机制。分析表明，激光诱导温度分布在1 ms内形成，马兰戈尼对流在0.01 ~ 1 s内开始，这使得溶解分子的传质增加了1 ~ 2个数量级，使其进入激光焦点，在那里被范德华力捕获并聚集。考虑到聚合物组装的特殊情况，这种机制表明它也可以成功地应用于从溶液中组装其他类型的簇和分子聚集体。(C) 2008美国光学学会。
A coupled mechanism for molecular aggregation in a thin water solution film by laser-tweezers is suggested based on (i) simulation of light intensity distribution and (ii) order of magnitude analysis of heat and mass transport induced by Marangoni convection. The analysis suggests that the laser induced temperature distribution develops within 1 ms and Marangoni convection flow commences within 0.01-1 s, which increases by 1-2 orders of magnitude the mass transfer of dissolved molecules into the laser focus where they are trapped and aggregate by attractive van der Waals forces. This mechanism, considered for the particular case of polymer assembly, suggests that it can also be successfully applied for assembling other types of clusters and molecular aggregates from solutions. (C) 2008 Optical Society of America.