College

College of Engineering and Polymer Science

Date of Last Revision

2022-04-28 08:26:50

Major

Chemical Engineering

Honors Course

4200:497

Number of Credits

3

Degree Name

Bachelor of Science

Date of Expected Graduation

Spring 2022

Abstract

The Namib Desert beetle, Stenocara gracilipes, condenses fog that rolls in off the west coast of Namibia to provide itself with the water it needs for the day. By lifting its abdomen into the air to collect the water vapor, it condenses on hydrophilic bumps that are about 500μm in diameter and are spaced apart about 500-1500μm. Once the water reaches a critical size, the droplet rolls off the hydrophilic bump and onto the flat hydrophobic surface of the elytra. Since the beetle is angled with its abdomen in the air, the water rolls down to its mouth. A design could be created to help costal regions that experience drought get potable water. This was done using glass beads as hydrophilic bumps on a polystyrene background to act as the hydrophobic surface. An alternative was explored using glass beads modified with hydrophobic agents: octadecyltrichlorosilane (OTS) and decyltrichlorosilane (DTS), to generate hydrophobic bumps and using nail polish as the hydrophilic background since it contains nitrocellulose which is hydrophilic. This was done to determine if the beetle’s characteristics could be improved. Overall, there was no significant difference between the designs’ water condensation capability to say that one was better in the end.

Research Sponsor

Dr. Bi-min Zhang Newby

First Reader

Dr. Roya Gitiafroz

Second Reader

Dr. Lu-Kwang Ju

Honors Faculty Advisor

Dr. Bi-min Zhang Newby

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