Abstract
Colloidal probe atomic force microscopy (CP-AFM) can be used for measuring force curves between the colloidal probe and the substrate in a colloidal suspension. In the experiment, an oscillatory force curve reflecting the layer structure of the colloidal particles on the substrate is usually obtained. However, the force curve is not equivalent to the interfacial structure of the colloidal particles. In this paper, the force curve is transformed into the number density distribution of the colloidal particles as a function of the distance from the substrate surface using our newly developed transform theory. It is found by the transform theory that the interfacial stratification is enhanced by an increase in an absolute value of the surface potential of the colloidal particle, despite a simultaneous increase in a repulsive electrostatic interaction between the substrate and the colloidal particle. To elucidate the mechanism of the stratification, an integral equation theory is employed. It is found that crowding of the colloidal particles in the bulk due to the increase in the absolute value of the surface potential of the colloidal particle leads to pushing out some colloidal particles to the wall. The combined method of CP-AFM and the transform theory (the experimental-theoretical study of the interfacial stratification) is related to colloidal crystallization, glass transition, and aggregation on a surface. Thus, the combined method is important for developments of colloidal nanotechnologies.
| Original language | English |
|---|---|
| Pages (from-to) | 4592-4599 |
| Number of pages | 8 |
| Journal | Journal of Physical Chemistry B |
| Volume | 122 |
| Issue number | 16 |
| DOIs | |
| Publication status | Published - Apr 26 2018 |
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ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Surfaces, Coatings and Films
- Materials Chemistry
Cite this
Stratification of Colloidal Particles on a Surface : Study by a Colloidal Probe Atomic Force Microscopy Combined with a Transform Theory. / Amano, Ken Ichi; Ishihara, Taira; Hashimoto, Kota; Ishida, Naoyuki; Fukami, Kazuhiro; Nishi, Naoya; Sakka, Tetsuo.
In: Journal of Physical Chemistry B, Vol. 122, No. 16, 26.04.2018, p. 4592-4599.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Stratification of Colloidal Particles on a Surface
T2 - Study by a Colloidal Probe Atomic Force Microscopy Combined with a Transform Theory
AU - Amano, Ken Ichi
AU - Ishihara, Taira
AU - Hashimoto, Kota
AU - Ishida, Naoyuki
AU - Fukami, Kazuhiro
AU - Nishi, Naoya
AU - Sakka, Tetsuo
PY - 2018/4/26
Y1 - 2018/4/26
N2 - Colloidal probe atomic force microscopy (CP-AFM) can be used for measuring force curves between the colloidal probe and the substrate in a colloidal suspension. In the experiment, an oscillatory force curve reflecting the layer structure of the colloidal particles on the substrate is usually obtained. However, the force curve is not equivalent to the interfacial structure of the colloidal particles. In this paper, the force curve is transformed into the number density distribution of the colloidal particles as a function of the distance from the substrate surface using our newly developed transform theory. It is found by the transform theory that the interfacial stratification is enhanced by an increase in an absolute value of the surface potential of the colloidal particle, despite a simultaneous increase in a repulsive electrostatic interaction between the substrate and the colloidal particle. To elucidate the mechanism of the stratification, an integral equation theory is employed. It is found that crowding of the colloidal particles in the bulk due to the increase in the absolute value of the surface potential of the colloidal particle leads to pushing out some colloidal particles to the wall. The combined method of CP-AFM and the transform theory (the experimental-theoretical study of the interfacial stratification) is related to colloidal crystallization, glass transition, and aggregation on a surface. Thus, the combined method is important for developments of colloidal nanotechnologies.
AB - Colloidal probe atomic force microscopy (CP-AFM) can be used for measuring force curves between the colloidal probe and the substrate in a colloidal suspension. In the experiment, an oscillatory force curve reflecting the layer structure of the colloidal particles on the substrate is usually obtained. However, the force curve is not equivalent to the interfacial structure of the colloidal particles. In this paper, the force curve is transformed into the number density distribution of the colloidal particles as a function of the distance from the substrate surface using our newly developed transform theory. It is found by the transform theory that the interfacial stratification is enhanced by an increase in an absolute value of the surface potential of the colloidal particle, despite a simultaneous increase in a repulsive electrostatic interaction between the substrate and the colloidal particle. To elucidate the mechanism of the stratification, an integral equation theory is employed. It is found that crowding of the colloidal particles in the bulk due to the increase in the absolute value of the surface potential of the colloidal particle leads to pushing out some colloidal particles to the wall. The combined method of CP-AFM and the transform theory (the experimental-theoretical study of the interfacial stratification) is related to colloidal crystallization, glass transition, and aggregation on a surface. Thus, the combined method is important for developments of colloidal nanotechnologies.
UR - http://www.scopus.com/inward/record.url?scp=85046006958&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85046006958&partnerID=8YFLogxK
U2 - 10.1021/acs.jpcb.8b01082
DO - 10.1021/acs.jpcb.8b01082
M3 - Article
AN - SCOPUS:85046006958
VL - 122
SP - 4592
EP - 4599
JO - Journal of Physical Chemistry B Materials
JF - Journal of Physical Chemistry B Materials
SN - 1520-6106
IS - 16
ER -