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  • 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
ABSTRACT

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.

MATERIALS
Product Number
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Product Description

Sigma-Aldrich
Poly(diallyldimethylammonium chloride) solution, average Mw 200,000-350,000 (medium molecular weight), 20 wt. % in H2O
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100 mL
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500 mL
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$522.00
Sigma-Aldrich
Poly(diallyldimethylammonium chloride) solution, average Mw 400,000-500,000 (high molecular weight), 20 wt. % in H2O
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100 mL
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$154.00
500 mL
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$522.00
Sigma-Aldrich
Poly(4-styrenesulfonic acid) solution, Mw ~75,000, 18 wt. % in H2O
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100 mL
Estimated to ship on March 24, 2025
$154.00
500 mL
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$522.00
Sigma-Aldrich
Poly(diallyldimethylammonium chloride) solution, average Mw <100,000 (very low molecular weight), 35 wt. % in H2O
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100 mL
Estimated to ship on March 24, 2025
$154.00
500 mL
Estimated to ship on March 24, 2025
$522.00
Sigma-Aldrich
Poly(diallyldimethylammonium chloride) solution, 20 wt. % in H2O
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100 mL
Estimated to ship on March 24, 2025
$154.00
500 mL
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$522.00
Sigma-Aldrich
Poly(sodium 4-styrenesulfonate) solution, average Mw ~200,000, 30 wt. % in H2O
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100 mL
Estimated to ship on March 24, 2025
$154.00
500 mL
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$522.00
Sigma-Aldrich
Poly(sodium 4-styrenesulfonate), average Mw ~70,000
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100 mL
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$154.00
500 mL
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$522.00
Sigma-Aldrich
Poly(sodium 4-styrenesulfonate) solution, average Mw ~1,000,000, 25 wt. % in H2O
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100 mL
Estimated to ship on March 24, 2025
$154.00
500 mL
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$522.00
Sigma-Aldrich
Poly(sodium 4-styrenesulfonate) solution, average Mw ~70,000, 30 wt. % in H2O
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100 mL
Estimated to ship on March 24, 2025
$154.00
500 mL
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$522.00
Sigma-Aldrich
Poly(sodium 4-styrenesulfonate), average Mw ~1,000,000, powder
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100 mL
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$154.00
500 mL
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$522.00