• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Langmuir: The ACS Journal of Surfaces and Colloids >Stick-Jump (SJ) Evaporation of Strongly Pinned Nanoliter Volume Sessile Water Droplets on Quick Drying, Micropatterned Surfaces
【24h】

Stick-Jump (SJ) Evaporation of Strongly Pinned Nanoliter Volume Sessile Water Droplets on Quick Drying, Micropatterned Surfaces

机译：在快速干燥的微图案表面上牢固固定的纳升体积无水水滴的粘滞跳跃（SJ）蒸发

获取原文
获取原文并翻译 | 示例
       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We present an experimental study of stick jump (SJ) evaporation of strongly pinned nanoliter volume sessile water droplets drying on micropatterned surfaces. The evaporation is studied on surfaces composed of photolithographically micropatterned negative photoresist (SU-8). The micropatterning of the SU-8 enables circular, smooth, trough like features to be formed which causes a very strong pinning of the three phase (liquid-vapor-solid) contact line of an evaporating droplet. This is ideal for studying SJ evaporation as it contains sequential constant contact radius (CCR) evaporation phases during droplet evaporation. The evaporation was studied in nonconfined conditions, and forced convection was not used. Micropatterned concentric circles were defined having an initial radius of 1000 mu m decreasing by a spacing ranging from 500 to 50 gm. The droplet evaporates, successively pinning and depinning from circle to circle. For each pinning radius, the droplet contact angle and volume are observed to decrease quasi-linearly with time. The experimental average evaporation rates were found to decrease with decreasing pining radii. In contrast, the experimental average evaporation flux is found to increase with decreasing droplet radii. The data also demonstrate the influence of the initial contact angle on evaporation rate and flux. The data indicate that the total evaporation time of a droplet depends on the specific micropattern spacing and that the total evaporation time on micropatterned surfaces is always less than on flat, homogeneous surfaces. Although the surface patterning is observed to have little effect on the average droplet flux indicating that the underlying evaporation physics is not significantly changed by the patterning the total evaporation time is considerably modified by patterning, up to a factor or almost 2 compared to evaporation on a flat, homogeneous surface. The closely spaced concentric circle pinning maintains a large droplet radius and small contact angle from jump to jump; the result is a large evaporation rate leading to faster evaporation.
机译：我们目前对微图案表面上干燥的强固定纳升体积无柄水滴的粘滞跳跃（SJ）蒸发进行实验研究。在由光刻微图案负性光刻胶（SU-8）组成的表面上研究了蒸发。 SU-8的微图案设计可形成圆形，光滑，低谷状的特征，从而使蒸发液滴的三相（液-气-固）接触线非常牢固地固定。这是研究SJ蒸发的理想选择，因为它包含液滴蒸发过程中的连续恒定接触半径（CCR）蒸发阶段。在无限制条件下研究了蒸发，没有使用强制对流。定义了微图案的同心圆，其初始半径为1000μm，间距减小了500至50 gm。液滴蒸发，从一个圈到另一个圈依次钉住和松动。对于每个钉扎半径，观察到液滴接触角和体积随时间近似线性减小。发现实验平均蒸发速率随着钉扎半径的减小而降低。相反，发现实验平均蒸发通量随着液滴半径的减小而增加。数据还证明了初始接触角对蒸发速率和通量的影响。数据表明，液滴的总蒸发时间取决于特定的微图案间距，并且微图案表面上的总蒸发时间始终小于平坦，均匀的表面上的总蒸发时间。尽管观察到表面图案化对平均液滴通量几乎没有影响，这表明通过图案化并没有显着改变基本的蒸发物理原理，但通过图案化可以显着地改变总蒸发时间，相比于在平板电脑上的蒸发量，蒸发时间最多可提高约2倍。平坦，均匀的表面。紧密间隔的同心圆钉扎可保持较大的液滴半径和较小的接触角。结果是较大的蒸发速率导致更快的蒸发。

著录项

相似文献

  • 外文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号