Water repellent porous silica films by sol-gel dip coating method

A. Venkateswara Rao, Annaso B. Gurav, Sanjay S. Latthe, Rajiv S. Vhatkar, Hiroaki Imai, Charles Kappenstein, P. B. Wagh, Satish C. Gupta

Research output: Contribution to journalArticle

62 Citations (Scopus)

Abstract

The wetting of solid surfaces by water droplets is ubiquitous in our daily lives as well as in industrial processes. In the present research work, water repellent porous silica films are prepared on glass substrate at room temperature by sol-gel process. The coating sol was prepared by keeping the molar ratio of methyltriethoxysilane (MTES), methanol (MeOH), water (H2O) constant at 1:12.90:4.74, respectively, with 2M NH4OH throughout the experiments and the molar ratio (M) of MTES/Ph-TMS was varied from 0 to 0.22. A simple dip coating technique is adopted to coat silica films on the glass substrates. The static water contact angle as high as 164° and water sliding angle as low as 4° was obtained for silica film prepared from M=0.22. The surface morphological studies of the prepared silica film showed the porous structure with pore sizes typically ranging from 200nm to 1.3μm. The superhydrophobic silica films prepared from M=0.22 retained their superhydrophobicity up to a temperature of 285°C and above this temperature the films became superhydrophilic. The porous and water repellent silica films are prepared by proper alteration of the Ph-TMS in the coating solution. The prepared silica films were characterized by surface profilometer, scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier Transform Infrared (FT-IR) spectroscopy, humidity tests, chemical aging tests, static and dynamic water contact angle measurements.

Original languageEnglish
Pages (from-to)30-35
Number of pages6
JournalJournal of Colloid and Interface Science
Volume352
Issue number1
DOIs
Publication statusPublished - 2010 Dec

Fingerprint

Silicon Dioxide
Sol-gels
Silica
Coatings
Water
Contact angle
Glass
Coating techniques
Polymethyl Methacrylate
Substrates
Angle measurement
Sols
Temperature
Sol-gel process
Pore size
Fourier transform infrared spectroscopy
Methanol
Wetting
Atmospheric humidity
Aging of materials

Keywords

  • Dynamic contact angle
  • Humidity
  • Hydrophobic
  • Porous films
  • Static contact angle
  • Wettability

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Colloid and Surface Chemistry

Cite this

Rao, A. V., Gurav, A. B., Latthe, S. S., Vhatkar, R. S., Imai, H., Kappenstein, C., ... Gupta, S. C. (2010). Water repellent porous silica films by sol-gel dip coating method. Journal of Colloid and Interface Science, 352(1), 30-35. https://doi.org/10.1016/j.jcis.2010.08.003

Water repellent porous silica films by sol-gel dip coating method. / Rao, A. Venkateswara; Gurav, Annaso B.; Latthe, Sanjay S.; Vhatkar, Rajiv S.; Imai, Hiroaki; Kappenstein, Charles; Wagh, P. B.; Gupta, Satish C.

In: Journal of Colloid and Interface Science, Vol. 352, No. 1, 12.2010, p. 30-35.

Research output: Contribution to journalArticle

Rao, AV, Gurav, AB, Latthe, SS, Vhatkar, RS, Imai, H, Kappenstein, C, Wagh, PB & Gupta, SC 2010, 'Water repellent porous silica films by sol-gel dip coating method', Journal of Colloid and Interface Science, vol. 352, no. 1, pp. 30-35. https://doi.org/10.1016/j.jcis.2010.08.003
Rao, A. Venkateswara ; Gurav, Annaso B. ; Latthe, Sanjay S. ; Vhatkar, Rajiv S. ; Imai, Hiroaki ; Kappenstein, Charles ; Wagh, P. B. ; Gupta, Satish C. / Water repellent porous silica films by sol-gel dip coating method. In: Journal of Colloid and Interface Science. 2010 ; Vol. 352, No. 1. pp. 30-35.
@article{43e6affc003e485b9d3d3db66cbd532b,
title = "Water repellent porous silica films by sol-gel dip coating method",
abstract = "The wetting of solid surfaces by water droplets is ubiquitous in our daily lives as well as in industrial processes. In the present research work, water repellent porous silica films are prepared on glass substrate at room temperature by sol-gel process. The coating sol was prepared by keeping the molar ratio of methyltriethoxysilane (MTES), methanol (MeOH), water (H2O) constant at 1:12.90:4.74, respectively, with 2M NH4OH throughout the experiments and the molar ratio (M) of MTES/Ph-TMS was varied from 0 to 0.22. A simple dip coating technique is adopted to coat silica films on the glass substrates. The static water contact angle as high as 164° and water sliding angle as low as 4° was obtained for silica film prepared from M=0.22. The surface morphological studies of the prepared silica film showed the porous structure with pore sizes typically ranging from 200nm to 1.3μm. The superhydrophobic silica films prepared from M=0.22 retained their superhydrophobicity up to a temperature of 285°C and above this temperature the films became superhydrophilic. The porous and water repellent silica films are prepared by proper alteration of the Ph-TMS in the coating solution. The prepared silica films were characterized by surface profilometer, scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier Transform Infrared (FT-IR) spectroscopy, humidity tests, chemical aging tests, static and dynamic water contact angle measurements.",
keywords = "Dynamic contact angle, Humidity, Hydrophobic, Porous films, Static contact angle, Wettability",
author = "Rao, {A. Venkateswara} and Gurav, {Annaso B.} and Latthe, {Sanjay S.} and Vhatkar, {Rajiv S.} and Hiroaki Imai and Charles Kappenstein and Wagh, {P. B.} and Gupta, {Satish C.}",
year = "2010",
month = "12",
doi = "10.1016/j.jcis.2010.08.003",
language = "English",
volume = "352",
pages = "30--35",
journal = "Journal of Colloid and Interface Science",
issn = "0021-9797",
publisher = "Academic Press Inc.",
number = "1",

}

TY - JOUR

T1 - Water repellent porous silica films by sol-gel dip coating method

AU - Rao, A. Venkateswara

AU - Gurav, Annaso B.

AU - Latthe, Sanjay S.

AU - Vhatkar, Rajiv S.

AU - Imai, Hiroaki

AU - Kappenstein, Charles

AU - Wagh, P. B.

AU - Gupta, Satish C.

PY - 2010/12

Y1 - 2010/12

N2 - The wetting of solid surfaces by water droplets is ubiquitous in our daily lives as well as in industrial processes. In the present research work, water repellent porous silica films are prepared on glass substrate at room temperature by sol-gel process. The coating sol was prepared by keeping the molar ratio of methyltriethoxysilane (MTES), methanol (MeOH), water (H2O) constant at 1:12.90:4.74, respectively, with 2M NH4OH throughout the experiments and the molar ratio (M) of MTES/Ph-TMS was varied from 0 to 0.22. A simple dip coating technique is adopted to coat silica films on the glass substrates. The static water contact angle as high as 164° and water sliding angle as low as 4° was obtained for silica film prepared from M=0.22. The surface morphological studies of the prepared silica film showed the porous structure with pore sizes typically ranging from 200nm to 1.3μm. The superhydrophobic silica films prepared from M=0.22 retained their superhydrophobicity up to a temperature of 285°C and above this temperature the films became superhydrophilic. The porous and water repellent silica films are prepared by proper alteration of the Ph-TMS in the coating solution. The prepared silica films were characterized by surface profilometer, scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier Transform Infrared (FT-IR) spectroscopy, humidity tests, chemical aging tests, static and dynamic water contact angle measurements.

AB - The wetting of solid surfaces by water droplets is ubiquitous in our daily lives as well as in industrial processes. In the present research work, water repellent porous silica films are prepared on glass substrate at room temperature by sol-gel process. The coating sol was prepared by keeping the molar ratio of methyltriethoxysilane (MTES), methanol (MeOH), water (H2O) constant at 1:12.90:4.74, respectively, with 2M NH4OH throughout the experiments and the molar ratio (M) of MTES/Ph-TMS was varied from 0 to 0.22. A simple dip coating technique is adopted to coat silica films on the glass substrates. The static water contact angle as high as 164° and water sliding angle as low as 4° was obtained for silica film prepared from M=0.22. The surface morphological studies of the prepared silica film showed the porous structure with pore sizes typically ranging from 200nm to 1.3μm. The superhydrophobic silica films prepared from M=0.22 retained their superhydrophobicity up to a temperature of 285°C and above this temperature the films became superhydrophilic. The porous and water repellent silica films are prepared by proper alteration of the Ph-TMS in the coating solution. The prepared silica films were characterized by surface profilometer, scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier Transform Infrared (FT-IR) spectroscopy, humidity tests, chemical aging tests, static and dynamic water contact angle measurements.

KW - Dynamic contact angle

KW - Humidity

KW - Hydrophobic

KW - Porous films

KW - Static contact angle

KW - Wettability

UR - http://www.scopus.com/inward/record.url?scp=77956940136&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77956940136&partnerID=8YFLogxK

U2 - 10.1016/j.jcis.2010.08.003

DO - 10.1016/j.jcis.2010.08.003

M3 - Article

C2 - 20822773

AN - SCOPUS:77956940136

VL - 352

SP - 30

EP - 35

JO - Journal of Colloid and Interface Science

JF - Journal of Colloid and Interface Science

SN - 0021-9797

IS - 1

ER -