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Interfacial behavior of cubic liquid crystalline nanoparticles at hydrophilic and hydrophobic surfaces

Vandoolaeghe, Pauline LU ; Tiberg, Fredrik LU and Nylander, Tommy LU (2006) In Langmuir 22(22). p.9169-9174
Abstract
The adsorption behavior of self-assembled lipid liquid crystalline nanoparticles at different model surfaces was investigated in situ by use of ellipsometry. The technique allows time-resolved monitoring of the adsorbed amount and layer thickness under transient and steady-state conditions. The system under study was cubic-phase nanoparticle (CPNP) dispersions of glycerol monooleate stabilized by a nonionic block copolymer, Pluronic F-127. Depending on the surface properties and presence of electrolytes, different adsorption scenarios were discerned: At hydrophilic silica thick surface layers of CPNPs are generated by particle adsorption from dispersions containing added electrolyte, but no adsorption is observed in pure water. Adsorption... (More)
The adsorption behavior of self-assembled lipid liquid crystalline nanoparticles at different model surfaces was investigated in situ by use of ellipsometry. The technique allows time-resolved monitoring of the adsorbed amount and layer thickness under transient and steady-state conditions. The system under study was cubic-phase nanoparticle (CPNP) dispersions of glycerol monooleate stabilized by a nonionic block copolymer, Pluronic F-127. Depending on the surface properties and presence of electrolytes, different adsorption scenarios were discerned: At hydrophilic silica thick surface layers of CPNPs are generated by particle adsorption from dispersions containing added electrolyte, but no adsorption is observed in pure water. Adsorption at the hydrophobic surface involves extensive structural relaxation and formation, which is not electrolyte sensitive, of a classic monolayer structure. The different observations are rationalized in terms of differences in interactions among the CPNP aggregates, their unimer constituents, and the surface and show a strong influence of interfacial interactions on structure formation. Surface self-assembly structures with properties similar to those of the corresponding bulk aggregates appear exclusively in the weak interaction limit. This observation is in agreement with observations for surfactant self-assembly systems, and our findings indicate that this behavior is applicable also to complex self-assembly structures such as the CPNP structures discussed herein. (Less)
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author
; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Langmuir
volume
22
issue
22
pages
9169 - 9174
publisher
The American Chemical Society (ACS)
external identifiers
  • wos:000241325200016
  • scopus:33751407323
  • pmid:17042525
ISSN
0743-7463
DOI
10.1021/la061224j
language
English
LU publication?
yes
id
316904e2-7600-4ff3-91ca-3e1f1dac25c8 (old id 387911)
date added to LUP
2016-04-01 12:12:38
date last changed
2021-10-06 05:11:47
@article{316904e2-7600-4ff3-91ca-3e1f1dac25c8,
  abstract     = {The adsorption behavior of self-assembled lipid liquid crystalline nanoparticles at different model surfaces was investigated in situ by use of ellipsometry. The technique allows time-resolved monitoring of the adsorbed amount and layer thickness under transient and steady-state conditions. The system under study was cubic-phase nanoparticle (CPNP) dispersions of glycerol monooleate stabilized by a nonionic block copolymer, Pluronic F-127. Depending on the surface properties and presence of electrolytes, different adsorption scenarios were discerned: At hydrophilic silica thick surface layers of CPNPs are generated by particle adsorption from dispersions containing added electrolyte, but no adsorption is observed in pure water. Adsorption at the hydrophobic surface involves extensive structural relaxation and formation, which is not electrolyte sensitive, of a classic monolayer structure. The different observations are rationalized in terms of differences in interactions among the CPNP aggregates, their unimer constituents, and the surface and show a strong influence of interfacial interactions on structure formation. Surface self-assembly structures with properties similar to those of the corresponding bulk aggregates appear exclusively in the weak interaction limit. This observation is in agreement with observations for surfactant self-assembly systems, and our findings indicate that this behavior is applicable also to complex self-assembly structures such as the CPNP structures discussed herein.},
  author       = {Vandoolaeghe, Pauline and Tiberg, Fredrik and Nylander, Tommy},
  issn         = {0743-7463},
  language     = {eng},
  number       = {22},
  pages        = {9169--9174},
  publisher    = {The American Chemical Society (ACS)},
  series       = {Langmuir},
  title        = {Interfacial behavior of cubic liquid crystalline nanoparticles at hydrophilic and hydrophobic surfaces},
  url          = {http://dx.doi.org/10.1021/la061224j},
  doi          = {10.1021/la061224j},
  volume       = {22},
  year         = {2006},
}