Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 36, Pages 31170-31180Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b09708
Keywords
superhydrophobic; candle soot; superhemophobic; cell viability; biocompatibility
Funding
- SERB, DST [EMR/2014/001151]
- IIT Madras [MEE1516843RFTPASHS]
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We report a simple, inexpensive, rapid, and one-step method for the fabrication of a stable and biocompatible super hydrophobic 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 degrees +/- 1 degrees and 2 degrees, respectively, and the blood contact angle is found to be 154 degrees +/- 1 degrees, which indicates 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.
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