Measurement of the electrostatic interaction between polyelectrolyte brush surfaces by optical tweezers.
Measurement of the electrostatic interaction between polyelectrolyte brush surfaces by optical tweezers.
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用光镊测量聚电解质刷表面之间的静电相互作用。
DOI：
10.1021/la404133e
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
A. Takahara
中科院分区：
文献类型：
--
作者：
D. Murakami;Ai Takenaka;M. Kobayashi;H. Jinnai;A. Takahara
我们展示了一种光钳方法来测量在水介质中接枝在二氧化硅颗粒上的强聚电解质刷poly(2-(methacryloyloxy)ethyltrimethylammonium(PMTAC)之间的静电相互作用。成功地探测到了弱静电相互作用，分辨率小于0.1μNm(-1)。表观德拜长度，包括聚合物电刷中的电荷分布和表面电位，随着介质中盐浓度的增加而减小。实验测得的表面电荷密度远小于由表面聚电解质含量估算的表面电荷密度。此外，降低聚电解质刷的接枝密度可以提高离子基团的离解程度。结果表明，大部分的氯反离子被固定在致密的聚电解质刷层中，以中和高的电荷密度。
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.
影响因子：
10.8
作者：
Spiering, Andre;Getfert, Sebastian;Anselmetti, Dario
通讯作者：
Anselmetti, Dario
影响因子：
10.8
作者：
Olof, S. N.;Grieve, J. A.;Carberry, D. M.
通讯作者：
Carberry, D. M.