Fabrication of Self-cleaning Antireflective Polymer Surfaces by Mimicking Underside Leaf Hierarchical Surface Structures  

作　　者：Srinadh Mattaparthi Chandra Shekhar Sharma 

机构地区：[1]Creative & Advanced Research Based on Nanomaterials (CARBON) Laboratory,Department of Chemical Engineerings Indian Institute of Technology Hyderabad, Kandi, Telangana 502285, India

出　　处：《Journal of Bionic Engineering》2019年第3期400-409,共10页仿生工程学报（英文版）

摘　　要：In this work, we utilized underside of four different plant leaves with different scale of hierarchical surface roughness to fabricate large area self-cleaning antireflective polymer surfaces. A simple and precise two-step soft-lithography replica molding technique was deployed by using polydimethylsiloxane (PDMS) polymer as a replicating material. In the first step, a negative PDMS replica was fabricated by using the underside of an original leaf as a template material. In the second step, a positive PDMS replica was fabricated through a negative PDMS replica used as a template. In order to study the non-wetting and light trapping properties, as-replicated polymer surfaces were characterized using Scanning Electron Microscopy (SEM), contact angle goniometer, and UV-Vis spectroscopy. SEM images confirmed the successful replication of complex hierarchical structures while contact angle measurement studies established retaining high non-wetting properties in polymer replicas. Optical studies suggest near zero reflection in normal mode and less than 5% diffuse reflection when measured using integrated sphere mode. These results have been correlated and explained with the air-liquid fraction and roughness factor as measured using three-dimensional optical profilometer.

关 键 词：biomimicking natural LEAF REPLICA molding non-wetting light trapping HIERARCHICAL roughness 

分 类 号：TB[一般工业技术]