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Micropattern-controlled wicking enhancement in hierarchical micro/nanostructures.
Soft Matter 2019; 15(32):6518-6529SM

Abstract

Wicking in hierarchical micro/nanostructured surfaces has attracted significant attention due to its potential applications in thermal management, moisture capturing, drug delivery, and oil recovery. Although some studies have shown that hierarchical structures enhance wicking over micro-structured surfaces, others have found very limited wicking improvement. In this study, we demonstrate the importance of micropatterns in wicking enhancement in hierarchical surfaces using ZnO nanorods grown on silicon micropillars of varying spacings and heights. The wicking front over hierarchical surfaces is found to follow a two-stage motion, where wicking is faster around micropillars, but slower in between adjacent pillar rows and the latter stage dictates the wicking enhancement in hierarchical surfaces. The competition between the added capillary action and friction due to nanostructures in these two different wicking stages results in a strong dependence of wicking enhancement on the height and spacing of the micropillars. A scaling model for the propagation coefficient is developed for wicking in hierarchical surfaces considering nanostructures in both wicking stages and the model agrees well with the experiments. This microstructure-controlled two-stage wicking characteristic sheds light on a more effective design of hierarchical micro/nanostructured surfaces for wicking enhancement.

Authors+Show Affiliations

Department of Mechanical Engineering and Mechanics, Drexel University, Philadelphia, PA 19104, USA. ys347@drexel.edu.Department of Mechanical Engineering and Mechanics, Drexel University, Philadelphia, PA 19104, USA. ys347@drexel.edu.Department of Mechanical Engineering and Mechanics, Drexel University, Philadelphia, PA 19104, USA. ys347@drexel.edu.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

31346591

Citation

Rokoni, Arif, et al. "Micropattern-controlled Wicking Enhancement in Hierarchical Micro/nanostructures." Soft Matter, vol. 15, no. 32, 2019, pp. 6518-6529.
Rokoni A, Kim DO, Sun Y. Micropattern-controlled wicking enhancement in hierarchical micro/nanostructures. Soft Matter. 2019;15(32):6518-6529.
Rokoni, A., Kim, D. O., & Sun, Y. (2019). Micropattern-controlled wicking enhancement in hierarchical micro/nanostructures. Soft Matter, 15(32), pp. 6518-6529. doi:10.1039/c9sm01055f.
Rokoni A, Kim DO, Sun Y. Micropattern-controlled Wicking Enhancement in Hierarchical Micro/nanostructures. Soft Matter. 2019 Aug 28;15(32):6518-6529. PubMed PMID: 31346591.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Micropattern-controlled wicking enhancement in hierarchical micro/nanostructures. AU - Rokoni,Arif, AU - Kim,Dong-Ook, AU - Sun,Ying, Y1 - 2019/07/26/ PY - 2019/7/28/pubmed PY - 2019/7/28/medline PY - 2019/7/27/entrez SP - 6518 EP - 6529 JF - Soft matter JO - Soft Matter VL - 15 IS - 32 N2 - Wicking in hierarchical micro/nanostructured surfaces has attracted significant attention due to its potential applications in thermal management, moisture capturing, drug delivery, and oil recovery. Although some studies have shown that hierarchical structures enhance wicking over micro-structured surfaces, others have found very limited wicking improvement. In this study, we demonstrate the importance of micropatterns in wicking enhancement in hierarchical surfaces using ZnO nanorods grown on silicon micropillars of varying spacings and heights. The wicking front over hierarchical surfaces is found to follow a two-stage motion, where wicking is faster around micropillars, but slower in between adjacent pillar rows and the latter stage dictates the wicking enhancement in hierarchical surfaces. The competition between the added capillary action and friction due to nanostructures in these two different wicking stages results in a strong dependence of wicking enhancement on the height and spacing of the micropillars. A scaling model for the propagation coefficient is developed for wicking in hierarchical surfaces considering nanostructures in both wicking stages and the model agrees well with the experiments. This microstructure-controlled two-stage wicking characteristic sheds light on a more effective design of hierarchical micro/nanostructured surfaces for wicking enhancement. SN - 1744-6848 UR - https://www.unboundmedicine.com/medline/citation/31346591/Micropattern-controlled_wicking_enhancement_in_hierarchical_micro/nanostructures L2 - https://doi.org/10.1039/c9sm01055f DB - PRIME DP - Unbound Medicine ER -