Polyelectrolyte uptake by PEMs: Impact of salt concentration

	Polyelectrolyte uptake by PEMs: Impact of salt concentration
	Zan XJ ; Peng B ; Hoagland DA ; Su ZH
刊名	polymer chemistry
	2011
卷号	2 期号:11 页码:2581-2589
关键词	QUARTZ-CRYSTAL MICROBALANCE MULTILAYER FILMS LINEAR GROWTH THIN-FILMS EXCHANGE SURFACE REGIME INTERPENETRATION NANOPARTICLES DEPOSITION
ISSN号	1759-9954
通讯作者	su zh
中文摘要	in a two-step process, polyelectrolytes are added to existing layer-by-layer (lbl)-constructed polyelectrolyte multilayer films (pems), generating versatile new films as well as fundamental insights into lbl assembly mechanisms. first, pem swelling is affected by exposure to aqueous salt solutions of high concentration, and second, polyelectrolyte is added to the swollen pem at the same high salt concentration. our strategy is illustrated by adding poly(styrene sulfonate) (pss) to poly (diallyldimethylammonium chloride)/pss pems swollen by nacl, the rebuilding steps tracked by the quartz crystal microbalance with dissipation, or qcm-d, approach. from the swelling after the first step, the association free energy of polycation and polyanion units is derived, similar to-7.0 kj mol(-1). swelling by salt strongly affects the rate of attachment, depth of permeation, and rate of diffusion of pss. at low salt ([nacl] less than similar to 1 m for pems constructed at [nacl] = 0.5 m), pss is added only at/near the pem surface, while at high salt ([nacl] greater than similar to 1 m for the same pems), pss fully permeates the pem, contributing a pss mass that can approach or exceed that already present; higher salt leads to greater pss uptake. even with sizable pss addition, uptake kinetics is closely diffusive, characterized by surprisingly large and sharply [nacl]-dependent diffusion coefficients (similar to 10(-14)-10(-12) cm(2) s(-1)). the kinetics at high salt concentreation offer no evidence of slow pem reorganization, although at low salt concentration, such reorganization remains possible.
收录类别	SCI收录期刊论文
语种	英语
WOS记录号	WOS:000295811400019
公开日期	2012-06-11
内容类型	期刊论文
源URL	[http://ir.ciac.jl.cn/handle/322003/44903]
专题	长春应用化学研究所_长春应用化学研究所知识产出_期刊论文
推荐引用方式 GB/T 7714	Zan XJ,Peng B,Hoagland DA,et al. Polyelectrolyte uptake by PEMs: Impact of salt concentration[J]. polymer chemistry,2011,2(11):2581-2589.
APA	Zan XJ,Peng B,Hoagland DA,&Su ZH.(2011).Polyelectrolyte uptake by PEMs: Impact of salt concentration.polymer chemistry,2(11),2581-2589.
MLA	Zan XJ,et al."Polyelectrolyte uptake by PEMs: Impact of salt concentration".polymer chemistry 2.11(2011):2581-2589.