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Controlled wettability of quartz surfaces
Abstract
The wettability of flat quartz-crystal surfaces has been assessed by measurement at 25 °C of contact angle at the water-vapour/water-drop/quartz-plate three-phase line. Plates pretreated by heating in vacuum gave angles, measured through the drop 1 min after removal from vacuum, of 0–44 ° as pretreatment temperature was increased from 200 to 1000 °C. Fully hydroxylated, therefore hydrophilic, quartz surfaces are progressively rendered hydrophobic by mutual condensation of surface hydroxyls to form siloxane bridges. Hysteresis was at a maximum after heating at 700–800 °C, indicating that maximum surface chemical heterogeneity was produced by heating in this temperature range. Plates methylated subsequent to heat treatment gave angles that were constant at ca. 80° up to treatment at 600 °C and that decreased from 80 to ca. 47 ° as the pretreatment temperature was further increased to 1000 °C. This variation with temperature is consistent with a mechanism for methylation in which only non-hydrogen-bonded surface hydroxyl groups on quartz are reactive towards the methylating reagent. Contact angles on both heat-treated and methylated plates were observed to decrease following extended exposure to water vapour.
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Citations
Cited by
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Emami, F. S., Puddu, V., Berry, R. J., Varshney, V., Patwardhan, S. V., Perry, C. C., & Heinz, H. (2014) · Chemistry of Materials · doi:10.1021/cm500365c · Cited by 567
Contact Angles and Hysteresis on Surfaces with Chemically Heterogeneous Islands
Extrand, C. W. (2003) · Langmuir · doi:10.1021/la0268350 · Cited by 400
Fadeev, A. Y., & McCarthy, T. J. (1999) · Langmuir · doi:10.1021/la981486o · Cited by 384
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Bourg, I. C., Beckingham, L. E., & DePaolo, D. J. (2015) · Environmental Science & Technology · doi:10.1021/acs.est.5b03003 · Cited by 163
Metadata
- Authors
- Lamb, R. N., & Furlong, D. N.
- Venue
- Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
- Publisher
- Royal Society of Chemistry (RSC)
- Published
- 1982
- Volume
- 78
- Issue
- 1
- Pages
- 61
- ISSN
- 0300-9599 (ISSN-L)
- OpenAlex
- W2070552567
- Cited by
- 184
- References
- 0
- FWCI
- 2.50
- Type
- journal article
- Language
- en
- Open access
- closed
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- Lamb, R. N., & Furlong, D. N. (1982). Controlled wettability of quartz surfaces. Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases. https://doi.org/10.1039/f19827800061
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