Abstract
We demonstrated an optical tweezers method to measure the electrostatic interaction between the strong polyelectrolyte brushes, poly(2-(methacryloyloxy) ethyltrimethylammonium chloride) (PMTAC), grafted on silica particles in aqueous media. The weak electrostatic interaction was successfully detected with a resolution of less than 0.1 μN m-1. The apparent Debye length, including the charge distribution in the polymer brush and the surface potential, decreased as the salt concentration in the medium increased. The experimentally obtained surface charge density was much smaller than that estimated from the amount of polyelectrolyte on the surface. Furthermore, the dissociation of ionic groups was enhanced by decreasing the grafting density of the polyelectrolyte brush. The results suggest that the majority of chloride counterions was immobilized in the dense polyelectrolyte brush layer to neutralize the high charge density.
| Original language | English |
|---|---|
| Pages (from-to) | 16093-16097 |
| Number of pages | 5 |
| Journal | Langmuir |
| Volume | 29 |
| Issue number | 52 |
| DOIs | |
| Publication status | Published - Dec 31 2013 |
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All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Surfaces and Interfaces
- Spectroscopy
- Electrochemistry
Cite this
Measurement of the electrostatic interaction between polyelectrolyte brush surfaces by optical tweezers. / Murakami, Daiki; Takenaka, Ai; Kobayashi, Motoyasu; Jinnai, Hiroshi; Takahara, Atsushi.
In: Langmuir, Vol. 29, No. 52, 31.12.2013, p. 16093-16097.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Measurement of the electrostatic interaction between polyelectrolyte brush surfaces by optical tweezers
AU - Murakami, Daiki
AU - Takenaka, Ai
AU - Kobayashi, Motoyasu
AU - Jinnai, Hiroshi
AU - Takahara, Atsushi
PY - 2013/12/31
Y1 - 2013/12/31
N2 - We demonstrated an optical tweezers method to measure the electrostatic interaction between the strong polyelectrolyte brushes, poly(2-(methacryloyloxy) ethyltrimethylammonium chloride) (PMTAC), grafted on silica particles in aqueous media. The weak electrostatic interaction was successfully detected with a resolution of less than 0.1 μN m-1. The apparent Debye length, including the charge distribution in the polymer brush and the surface potential, decreased as the salt concentration in the medium increased. The experimentally obtained surface charge density was much smaller than that estimated from the amount of polyelectrolyte on the surface. Furthermore, the dissociation of ionic groups was enhanced by decreasing the grafting density of the polyelectrolyte brush. The results suggest that the majority of chloride counterions was immobilized in the dense polyelectrolyte brush layer to neutralize the high charge density.
AB - We demonstrated an optical tweezers method to measure the electrostatic interaction between the strong polyelectrolyte brushes, poly(2-(methacryloyloxy) ethyltrimethylammonium chloride) (PMTAC), grafted on silica particles in aqueous media. The weak electrostatic interaction was successfully detected with a resolution of less than 0.1 μN m-1. The apparent Debye length, including the charge distribution in the polymer brush and the surface potential, decreased as the salt concentration in the medium increased. The experimentally obtained surface charge density was much smaller than that estimated from the amount of polyelectrolyte on the surface. Furthermore, the dissociation of ionic groups was enhanced by decreasing the grafting density of the polyelectrolyte brush. The results suggest that the majority of chloride counterions was immobilized in the dense polyelectrolyte brush layer to neutralize the high charge density.
UR - http://www.scopus.com/inward/record.url?scp=84891594741&partnerID=8YFLogxK
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U2 - 10.1021/la404133e
DO - 10.1021/la404133e
M3 - Article
AN - SCOPUS:84891594741
VL - 29
SP - 16093
EP - 16097
JO - Langmuir
JF - Langmuir
SN - 0743-7463
IS - 52
ER -