Merck
CN
  • Responsive polyelectrolyte multilayers assembled at high ionic strength with an unusual collapse at low ionic strength.

Responsive polyelectrolyte multilayers assembled at high ionic strength with an unusual collapse at low ionic strength.

Macromolecular rapid communications (2012-08-31)
Joseba Irigoyen, Lulu Han, Irantzu Llarena, Zhenwei Mao, Changyou Gao, Sergio E Moya
PMID22933191
摘要

Responsive polyelectrolyte multilayers (PEMs) of poly(diallyl dimethyl ammonium chloride) (PDADMAC) and poly(styrene sodium sulfonate) (PSS) with thicknesses between 350 and 400 nm for 11 deposited polyelectrolyte layers were fabricated assembling the polyelectrolytes at 3 M NaCl. When the 3 M NaCl bulk solution is replaced by water, the PEMs release water, approximately a 46% of the total mass, and experience a thickness reduction of more than 200 nm. Changes in thickness and water content are fully reversible. The film recovers its original thickness and water content when it is exposed again to a 3 M NaCl solution. A responsive polymer film is achieved with the capability of swelling at high ionic strength and collapsing in water with variations in thickness of hundred of nanometers.

材料
货号
品牌
产品描述
243051
Sigma-Aldrich
聚(4-苯乙烯磺酸钠), average Mw ~70,000
409022
Sigma-Aldrich
聚（二烯丙基二甲基氯化铵） 溶液, average Mw 200,000-350,000 (medium molecular weight), 20 wt. % in H2O
561223
Sigma-Aldrich
聚(4-苯乙烯磺酸) 溶液, Mw ~75,000, 18 wt. % in H2O
409014
Sigma-Aldrich
聚（二烯丙基二甲基氯化铵） 溶液, 20 wt. % in H2O
522376
Sigma-Aldrich
聚（二烯丙基二甲基氯化铵） 溶液, average Mw <100,000 (very low molecular weight), 35 wt. % in H2O
434574
Sigma-Aldrich
聚(4-苯乙烯磺酸钠), average Mw ~1,000,000, powder
409030
Sigma-Aldrich
聚（二烯丙基二甲基氯化铵） 溶液, average Mw 400,000-500,000 (high molecular weight), 20 wt. % in H2O
561967
Sigma-Aldrich
聚(4-苯乙烯磺酸钠) 溶液, average Mw ~200,000, 30 wt. % in H2O
527483
Sigma-Aldrich
聚(4-苯乙烯磺酸钠) 溶液, average Mw ~70,000, 30 wt. % in H2O
527491
Sigma-Aldrich
聚(4-苯乙烯磺酸钠) 溶液, average Mw ~1,000,000, 25 wt. % in H2O