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Depletion controlled surface deposition of uncharged colloidal spheres from stable bulk dispersions

Ouhajji, Samia; Nylander, Tommy LU ; Piculell, Lennart LU ; Tuinier, Remco; Linse, Per LU and Philipse, Albert P. (2016) In Soft Matter 12(17). p.3963-3971
Abstract

The competition between surface adsorption and bulk aggregation was investigated for silica colloids dispersed in cyclohexane in contact with hydrophobized silica substrates. Central to this study is that the colloids and surfaces have the same material and surface properties. Colloid-colloid and colloid-surface interactions were controlled by addition of polymers providing depletion interaction. Bulk instability was determined by turbidity and viscosity measurements and surface adsorption by ellipsometry measurements. At increasing polymer concentration, strong surface adsorption occurred at polymer concentrations below that required for bulk phase separation. Complementary Monte Carlo simulations with the use of a new weak depletion... (More)

The competition between surface adsorption and bulk aggregation was investigated for silica colloids dispersed in cyclohexane in contact with hydrophobized silica substrates. Central to this study is that the colloids and surfaces have the same material and surface properties. Colloid-colloid and colloid-surface interactions were controlled by addition of polymers providing depletion interaction. Bulk instability was determined by turbidity and viscosity measurements and surface adsorption by ellipsometry measurements. At increasing polymer concentration, strong surface adsorption occurred at polymer concentrations below that required for bulk phase separation. Complementary Monte Carlo simulations with the use of a new weak depletion theory support quantitatively the experimental observation of the existence of an interval of interaction strength at which aggregation in bulk is negligible while surface adsorption is substantial.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Soft Matter
volume
12
issue
17
pages
9 pages
publisher
Royal Society of Chemistry
external identifiers
  • Scopus:84966283649
ISSN
1744-683X
DOI
10.1039/c5sm02892b
language
English
LU publication?
yes
id
43ac0833-58df-4c64-bb3c-d44eea5bc438
date added to LUP
2016-10-10 10:20:43
date last changed
2016-11-14 11:58:15
@misc{43ac0833-58df-4c64-bb3c-d44eea5bc438,
  abstract     = {<p>The competition between surface adsorption and bulk aggregation was investigated for silica colloids dispersed in cyclohexane in contact with hydrophobized silica substrates. Central to this study is that the colloids and surfaces have the same material and surface properties. Colloid-colloid and colloid-surface interactions were controlled by addition of polymers providing depletion interaction. Bulk instability was determined by turbidity and viscosity measurements and surface adsorption by ellipsometry measurements. At increasing polymer concentration, strong surface adsorption occurred at polymer concentrations below that required for bulk phase separation. Complementary Monte Carlo simulations with the use of a new weak depletion theory support quantitatively the experimental observation of the existence of an interval of interaction strength at which aggregation in bulk is negligible while surface adsorption is substantial.</p>},
  author       = {Ouhajji, Samia and Nylander, Tommy and Piculell, Lennart and Tuinier, Remco and Linse, Per and Philipse, Albert P.},
  issn         = {1744-683X},
  language     = {eng},
  month        = {05},
  number       = {17},
  pages        = {3963--3971},
  publisher    = {ARRAY(0x98ea3b0)},
  series       = {Soft Matter},
  title        = {Depletion controlled surface deposition of uncharged colloidal spheres from stable bulk dispersions},
  url          = {http://dx.doi.org/10.1039/c5sm02892b},
  volume       = {12},
  year         = {2016},
}