Facile Fabrication and Characterization of a PDMS-Derived Candle

Aug 22, 2017 - ... respectively, and the blood contact angle is found to be 154° ± 1°, which indicates that the surface is superhydrophobic and sup...
0 downloads 12 Views 3MB Size
Subscriber access provided by PEPPERDINE UNIV

Article

Facile fabrication and characterization of a PDMS-derived candle soot coated stable biocompatible superhydrophobic and superhemophobic surface Rameez Iqbal, Butunath Majhy, and Ashis K. Sen ACS Appl. Mater. Interfaces, Just Accepted Manuscript • DOI: 10.1021/acsami.7b09708 • Publication Date (Web): 22 Aug 2017 Downloaded from http://pubs.acs.org on August 24, 2017

Just Accepted “Just Accepted” manuscripts have been peer-reviewed and accepted for publication. They are posted online prior to technical editing, formatting for publication and author proofing. The American Chemical Society provides “Just Accepted” as a free service to the research community to expedite the dissemination of scientific material as soon as possible after acceptance. “Just Accepted” manuscripts appear in full in PDF format accompanied by an HTML abstract. “Just Accepted” manuscripts have been fully peer reviewed, but should not be considered the official version of record. They are accessible to all readers and citable by the Digital Object Identifier (DOI®). “Just Accepted” is an optional service offered to authors. Therefore, the “Just Accepted” Web site may not include all articles that will be published in the journal. After a manuscript is technically edited and formatted, it will be removed from the “Just Accepted” Web site and published as an ASAP article. Note that technical editing may introduce minor changes to the manuscript text and/or graphics which could affect content, and all legal disclaimers and ethical guidelines that apply to the journal pertain. ACS cannot be held responsible for errors or consequences arising from the use of information contained in these “Just Accepted” manuscripts.

ACS Applied Materials & Interfaces is published by the American Chemical Society. 1155 Sixteenth Street N.W., Washington, DC 20036 Published by American Chemical Society. Copyright © American Chemical Society. However, no copyright claim is made to original U.S. Government works, or works produced by employees of any Commonwealth realm Crown government in the course of their duties.

Page 1 of 21

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60

ACS Applied Materials & Interfaces

2

Facile fabrication and characterization of a PDMS-derived candle soot coated stable biocompatible superhydrophobic and superhemophobic surface

3

R. Iqbal, B. Majhy, A. K. Sen*

4 5 6 7 8 9

Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai-600036, India

1

*

Author to whom correspondence should be addressed. Email: [email protected]

Abstract

10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

We report a simple, inexpensive, rapid and one-step method for the fabrication of a stable and biocompatible superhydrophobic and superhemophobic surface. The proposed surface comprises candle soot particles embedded in a mixture of PDMS+n-hexane serving as the base material. The mechanism responsible for the superhydrophobic behavior of the surface is explained and the surface is characterized based on its morphology and elemental composition, wetting properties, mechanical and chemical stability and biocompatibility. The effect of %n-hexane in PDMS, the thickness of the PDMS+n-hexane layer (in terms of spin coating speed) and sooting time on the wetting property of the surface is studied. The proposed surface exhibits nanoscale surface asperities (average roughness of 187 nm), chemical compositions of soot particles, very high water and blood repellency along with excellent mechanical and chemical stability and excellent biocompatibility against blood sample and biological cells. The water contact angle and roll-off angle is measured as 160±1°and 2° respectively and blood contact angle is found to be 154±1° which indicate that the surface is superhydrophobic and superhemophobic. The proposed superhydrophobic and superhemophobic surface offers significantly improved (>40%) cell viability as compared to glass and PDMS surfaces.

26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52

Wetting phenomena are ubiquitous in nature1 as well as in many technological applications including liquid coating2, biological activities3 and microfluidics3. Depending on the wettability of a surface with water, solid surfaces can be categorized into many different types such as hydrophilic, superhydrophilic, hydrophobic and superhydrophobic. Superhydrophobic surfaces4, that exhibit a very high water contact angle (>150º) as well as a very low sliding angle (150° ) and extremely low roll-off angle (