ICCAS OpenIR
Response of a Permanently Charged Polyelectrolyte Brush to External Ions: The Aspects of Structure and Dynamics
Zhao, Bintao1,2; Yuan, Guangcui3; Chu, Xiao1; Yang, Jingfa1; Zhao, Jiang1
2018-06-12
Source PublicationLANGMUIR
ISSN0743-7463
Volume34Issue:23Pages:6757-6765
AbstractStructure and dynamics inside permanently charged polyelectrolyte brushes, sodium polystyrene sulfonate brushes, during their response to the introduction of external ions (NaCI) are investigated by neutron reflectivity and dielectric spectroscopy. Neutron reflectivity measurements show that the segmental density of the inner part of the brushes decreases and that of the outer part increases when the salt level is tuned from the salt-free condition to a moderate level (<10(-2) M)-the brushes swell further compared with the salt-free condition. This is attributed to the breakup of the multiplets formed by dipole-dipole pairs, and by this process, the previously constrained chain segments by the multiplets are released. Dielectric spectroscopy discovers a giant dipole by the charge separation of the adsorbed counterions and the PSS- chains, induced by electric field. The dynamics of the induced giant dipole is accelerated with the increase of external salt, as a result of the charge regularization by elevated salt level. At high-enough salt level, the screening effect reduces the electrostatic repulsion between the neighboring chains and makes the brushes
DOI10.1021/acs.langmuir.8b01195
Indexed BySCI
Language英语
WOS IDWOS:000435417300014
PublisherAMER CHEMICAL SOC
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/42512
Collection中国科学院化学研究所
Corresponding AuthorZhao, Jiang
Affiliation1.Chinese Acad Sci, Inst Chem, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.NIST, Ctr Neutron Res, Gaithersburg, MD 20899 USA
Recommended Citation
GB/T 7714
Zhao, Bintao,Yuan, Guangcui,Chu, Xiao,et al. Response of a Permanently Charged Polyelectrolyte Brush to External Ions: The Aspects of Structure and Dynamics[J]. LANGMUIR,2018,34(23):6757-6765.
APA Zhao, Bintao,Yuan, Guangcui,Chu, Xiao,Yang, Jingfa,&Zhao, Jiang.(2018).Response of a Permanently Charged Polyelectrolyte Brush to External Ions: The Aspects of Structure and Dynamics.LANGMUIR,34(23),6757-6765.
MLA Zhao, Bintao,et al."Response of a Permanently Charged Polyelectrolyte Brush to External Ions: The Aspects of Structure and Dynamics".LANGMUIR 34.23(2018):6757-6765.
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