TY - JOUR
T1 - Loss of a membrane phase under soft confinement conditions imposed by a porous silica colloids network
AU - Tanimura, Miho
AU - Sugahara, Yoshiyuki
AU - Guégan, Régis
N1 - Funding Information:
We are grateful to the Mitsubishi Materials for their support in this research. In addition, the authors would like to thank the Région Centre (project MONITOPOL) for their financial support.
Funding Information:
We are grateful to the Mitsubishi Materials for their support in this research. In addition, the authors would like to thank the R?gion Centre (project MONITOPOL) for their financial support.
Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2021/1/5
Y1 - 2021/1/5
N2 - Poly(ethylene glycol) mono-alkyl ether (CnEm) nonionic surfactants can form various liquid crystalline phases in water that are not altered by a change of pH nor by the presence inorganic materials. Their nonionic membrane phases were thus used as model system to mimic biological cell membranes and their behavior in the presence of inorganic colloids. In this study, a membrane phase formed by the triethylene glycol monodecyl ether (C10E3) nonionic surfactant was used as a model system to study the impact of topological constraints, and other confinement effects imposed / induced by aerosil gels. Smoked silica aerosil nanoparticles formed porous gels when aerosils interacted by siloxane bonds, in which both the pore volume and surface disorder were modulated by the concentration of nanoparticles with diameters of 7, 16, 20 & 40 nm. With the use of small angle X-ray scattering (SAXS) and polarized optical microscopy (POM) techniques as probes, the nonionic membranes could be stabilized at high temperatures, up to 8 °C higher than with bulk systems. These collapsed at high aerosil concentrations where, however drastic effects of confinement (finite size, interaction to the surface) altered the rigidity of the membranes. These effects led to a slowing down of the dynamics and a change in the elastic properties of the membranes that were not able to adapt within the aerosil gels, leading to their collapse into micellar phases. Since aerosils gels can be aligned by weak stimuli, one of a research prospects may concern the understanding of the confinement of nonionic membrane phases formed by the C10E3 as well as other CnEm surfactants in these anisotropic soft confinement matrixes.
AB - Poly(ethylene glycol) mono-alkyl ether (CnEm) nonionic surfactants can form various liquid crystalline phases in water that are not altered by a change of pH nor by the presence inorganic materials. Their nonionic membrane phases were thus used as model system to mimic biological cell membranes and their behavior in the presence of inorganic colloids. In this study, a membrane phase formed by the triethylene glycol monodecyl ether (C10E3) nonionic surfactant was used as a model system to study the impact of topological constraints, and other confinement effects imposed / induced by aerosil gels. Smoked silica aerosil nanoparticles formed porous gels when aerosils interacted by siloxane bonds, in which both the pore volume and surface disorder were modulated by the concentration of nanoparticles with diameters of 7, 16, 20 & 40 nm. With the use of small angle X-ray scattering (SAXS) and polarized optical microscopy (POM) techniques as probes, the nonionic membranes could be stabilized at high temperatures, up to 8 °C higher than with bulk systems. These collapsed at high aerosil concentrations where, however drastic effects of confinement (finite size, interaction to the surface) altered the rigidity of the membranes. These effects led to a slowing down of the dynamics and a change in the elastic properties of the membranes that were not able to adapt within the aerosil gels, leading to their collapse into micellar phases. Since aerosils gels can be aligned by weak stimuli, one of a research prospects may concern the understanding of the confinement of nonionic membrane phases formed by the C10E3 as well as other CnEm surfactants in these anisotropic soft confinement matrixes.
KW - Aerosil gels
KW - Confinement
KW - Helfrich interaction
KW - Nanoparticles
KW - Nonionic membranes
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U2 - 10.1016/j.colsurfa.2020.125554
DO - 10.1016/j.colsurfa.2020.125554
M3 - Article
AN - SCOPUS:85091093867
SN - 0927-7757
VL - 608
JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects
JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects
M1 - 125554
ER -