Author:
,Grześkiewicz Katarzyna,Bełej Monika, ,Bartkiewicz Stanisław, ,Miniewicz Andrzej,
Abstract
Crystallization of organic substances from solution in the presence of laser light is a relatively new concept. In this work we describe a unique way of increasing of local concentration of para-nitroaniline (pNA) in 1,4 -dioxane by using strongly absorbed laser light leading to controlled crystal growth.he key process enabling this control is laser induced thermocapillary Marangoni effect, which on microscopic scale results in near surface liquid flows. These flows are due to strong temperature gradients, formed locally by light absorption of the laser beam as well as induced changes of surface tension. As a result a strongly saturated in pNA sesille droplet is formed whose position can be can be effectively steered by beam manipulation. Such an approach enables not only para-nitroaniline crystal growth inside droplet itself but also control over supplying saturated solution portions to the area in which crystallization takes place.
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