PMID- 30109884
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20180907
LR  - 20180907
IS  - 1744-6848 (Electronic)
IS  - 1744-683X (Linking)
VI  - 14
IP  - 34
DP  - 2018 Aug 29
TI  - Tailored topography: a novel fabrication technique using an elasticity gradient.
PG  - 7034-7044
LID - 10.1039/c8sm01054d [doi]
AB  - A facile methodology to create a wrinkled surface with a tailored topography is 
      presented herein. The dependency of the elasticity of poly(dimethyl)siloxane 
      (PDMS) on the curing temperature has been exploited to obtain a substrate with an 
      elasticity gradient. The temperature gradient across the length of PDMS is 
      created by a novel set-up consisting of a metal and insulator connected to a 
      heater and the highest usable (no degradation of PDMS) temperature gradient is 
      used. The time-dependent temperature distributions along the substrate are 
      measured and the underlying physics of the dependence of the PDMS elasticity on 
      the curing temperature is addressed. The PDMS substrate with the elasticity 
      gradient is first stretched and subsequently oxidized by oxygen plasma. Upon 
      relaxation, an ordered wrinkled surface with continuously varying wavelength and 
      amplitude along the length of PDMS is obtained. The extent of hydrophobicity 
      recovery of this plasma oxidized PDMS with varying elasticity has been studied. 
      The change in the wavelength and amplitude of the regular patterns on the 
      substrate can be controlled by varying operational parameters like applied 
      pre-strain, plasma power and the heater temperature. It has been found that the 
      spatial distributions of the topography and the hydrophobicity collectively 
      decide the resultant wettability of the substrate. Such surfaces with gradients 
      in the substructure dimensions demonstrate different wetting characteristics that 
      may lead to a wide gamut of applications including droplet movement, cell 
      adhesion and proliferation, diffraction grating etc.
FAU - Parihar, Vartika
AU  - Parihar V
AD  - Department of Chemical Engineering, Indian Institute of Technology Kharagpur, 
      Kharagpur 721302, West Bengal, India. sunando@che.iitkgp.ernet.in.
FAU - Bandyopadhyay, Saumyadwip
AU  - Bandyopadhyay S
FAU - Das, Soumen
AU  - Das S
FAU - Mukherjee, Rabibrata
AU  - Mukherjee R
FAU - Chakraborty, Suman
AU  - Chakraborty S
FAU - Dasgupta, Sunando
AU  - Dasgupta S
LA  - eng
PT  - Journal Article
PL  - England
TA  - Soft Matter
JT  - Soft matter
JID - 101295070
EDAT- 2018/08/16 06:00
MHDA- 2018/08/16 06:01
CRDT- 2018/08/16 06:00
PHST- 2018/08/16 06:00 [pubmed]
PHST- 2018/08/16 06:01 [medline]
PHST- 2018/08/16 06:00 [entrez]
AID - 10.1039/c8sm01054d [doi]
PST - ppublish
SO  - Soft Matter. 2018 Aug 29;14(34):7034-7044. doi: 10.1039/c8sm01054d.