Liquid Evaporation on Superhydrophobic and Superhydrophilic Nanostructured Surfaces
Environmental scanning electron microscope (ESEM) images of water evaporation from superhydrophilic and superhydrophobic nanostructured surfaces are presented. The nanostructured surfaces consiste of an array of equidistant silicon nanopillars with diameter, height, and spacing of 300 nm, 7.5 um, an...
| Main Authors: | , , , , |
|---|---|
| Other Authors: | |
| Format: | Article |
| Language: | en_US |
| Published: |
ASME International
2014
|
| Online Access: | http://hdl.handle.net/1721.1/84995 https://orcid.org/0000-0002-8272-690X https://orcid.org/0000-0001-7045-1200 |
| _version_ | 1826214499305127936 |
|---|---|
| author | Miljkovic, Nenad Enright, Ryan Maroo, Shalabh Cho, H. Jeremy Wang, Evelyn N. |
| author2 | Massachusetts Institute of Technology. Department of Mechanical Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Mechanical Engineering Miljkovic, Nenad Enright, Ryan Maroo, Shalabh Cho, H. Jeremy Wang, Evelyn N. |
| author_sort | Miljkovic, Nenad |
| collection | MIT |
| description | Environmental scanning electron microscope (ESEM) images of water evaporation from superhydrophilic and superhydrophobic nanostructured surfaces are presented. The nanostructured surfaces consiste of an array of equidistant silicon nanopillars with diameter, height, and spacing of 300 nm, 7.5 um, and 2 um, respectively. The water vapor pressure in the ESEM chamber was 1400 Pa and the surface temperature was 10 ± 0.1 ˚C. The three images capture the late stages of evaporation on the nanostructured surfaces. Capillary forces generated by the receding meniscus on the hydrophilic surface result in liquid entrapment and 'kissing' pillars as shown in Figure 1a. These 'kissing' pillars allow for the formation of a rare metastable pinned droplet with a highly irregular contact line as shown in Figure 1b. Figure 2 depicts the remains of a mixed wetting mode droplet, in the Cassie and Wenzel states, on hydrophobic nanostructures comprised of silane-coated silicon. The droplets cause the pillars to bend due to surface tension forces; however 'kissing' pillars are not observed due to the hydrophobicity of the nanostructures. These liquid-surface interactions can significantly alter the dynamics of phase-change phenomena on nanostructured surfaces. The visualizations provide insight into these complex interactions, which is important for integration of nanostructured surfaces in thermal management devices. |
| first_indexed | 2024-09-23T16:06:44Z |
| format | Article |
| id | mit-1721.1/84995 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T16:06:44Z |
| publishDate | 2014 |
| publisher | ASME International |
| record_format | dspace |
| spelling | mit-1721.1/849952022-09-29T18:15:49Z Liquid Evaporation on Superhydrophobic and Superhydrophilic Nanostructured Surfaces Miljkovic, Nenad Enright, Ryan Maroo, Shalabh Cho, H. Jeremy Wang, Evelyn N. Massachusetts Institute of Technology. Department of Mechanical Engineering Miljkovic, Nenad Miljkovic, Nenad Enright, Ryan Maroo, Shalabh Wang, Evelyn N. Cho, H. Jeremy Environmental scanning electron microscope (ESEM) images of water evaporation from superhydrophilic and superhydrophobic nanostructured surfaces are presented. The nanostructured surfaces consiste of an array of equidistant silicon nanopillars with diameter, height, and spacing of 300 nm, 7.5 um, and 2 um, respectively. The water vapor pressure in the ESEM chamber was 1400 Pa and the surface temperature was 10 ± 0.1 ˚C. The three images capture the late stages of evaporation on the nanostructured surfaces. Capillary forces generated by the receding meniscus on the hydrophilic surface result in liquid entrapment and 'kissing' pillars as shown in Figure 1a. These 'kissing' pillars allow for the formation of a rare metastable pinned droplet with a highly irregular contact line as shown in Figure 1b. Figure 2 depicts the remains of a mixed wetting mode droplet, in the Cassie and Wenzel states, on hydrophobic nanostructures comprised of silane-coated silicon. The droplets cause the pillars to bend due to surface tension forces; however 'kissing' pillars are not observed due to the hydrophobicity of the nanostructures. These liquid-surface interactions can significantly alter the dynamics of phase-change phenomena on nanostructured surfaces. The visualizations provide insight into these complex interactions, which is important for integration of nanostructured surfaces in thermal management devices. 2014-02-19T14:10:28Z 2014-02-19T14:10:28Z 2011-04 Article http://purl.org/eprint/type/JournalArticle 00221481 http://hdl.handle.net/1721.1/84995 Miljkovic, Nenad, Ryan Enright, Shalabh C. Maroo, H. Jeremy Cho, and Evelyn N. Wang. “Liquid Evaporation on Superhydrophobic and Superhydrophilic Nanostructured Surfaces.” Journal of Heat Transfer 133, no. 8 (2011): 080903. https://orcid.org/0000-0002-8272-690X https://orcid.org/0000-0001-7045-1200 en_US http://dx.doi.org/10.1115/1.4003890 Journal of Heat Transfer Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf ASME International Nenad Miljkovic |
| spellingShingle | Miljkovic, Nenad Enright, Ryan Maroo, Shalabh Cho, H. Jeremy Wang, Evelyn N. Liquid Evaporation on Superhydrophobic and Superhydrophilic Nanostructured Surfaces |
| title | Liquid Evaporation on Superhydrophobic and Superhydrophilic Nanostructured Surfaces |
| title_full | Liquid Evaporation on Superhydrophobic and Superhydrophilic Nanostructured Surfaces |
| title_fullStr | Liquid Evaporation on Superhydrophobic and Superhydrophilic Nanostructured Surfaces |
| title_full_unstemmed | Liquid Evaporation on Superhydrophobic and Superhydrophilic Nanostructured Surfaces |
| title_short | Liquid Evaporation on Superhydrophobic and Superhydrophilic Nanostructured Surfaces |
| title_sort | liquid evaporation on superhydrophobic and superhydrophilic nanostructured surfaces |
| url | http://hdl.handle.net/1721.1/84995 https://orcid.org/0000-0002-8272-690X https://orcid.org/0000-0001-7045-1200 |
| work_keys_str_mv | AT miljkovicnenad liquidevaporationonsuperhydrophobicandsuperhydrophilicnanostructuredsurfaces AT enrightryan liquidevaporationonsuperhydrophobicandsuperhydrophilicnanostructuredsurfaces AT marooshalabh liquidevaporationonsuperhydrophobicandsuperhydrophilicnanostructuredsurfaces AT chohjeremy liquidevaporationonsuperhydrophobicandsuperhydrophilicnanostructuredsurfaces AT wangevelynn liquidevaporationonsuperhydrophobicandsuperhydrophilicnanostructuredsurfaces |