Adsorption Kinetics of cationic Polyelectrolytes studied with Stagnation Point Adsorption Reflectometry and Quartz Crystal Microgravimetry

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Fältnamn	Indikatorer	Metadata
000		03176naa a2200325 4500
001		oai:DiVA.org:kth-6014
003		SwePub
008		060621s2008 \| \|\|\|\|\|\|\|\|\|\|\|000 \|\|eng\|
024	7	a https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-60142 URI
024	7	a https://doi.org/10.1021/la800198e2 DOI
040		a (SwePub)kth
041		a engb eng
042		9 SwePub
072	7	a ref2 swepub-contenttype
072	7	a art2 swepub-publicationtype
100	1	a Enarsson, Lars-Eriku KTH,Fiber- och polymerteknologi4 aut0 (Swepub:kth)u14kkow4
245	1 0	a Adsorption Kinetics of cationic Polyelectrolytes studied with Stagnation Point Adsorption Reflectometry and Quartz Crystal Microgravimetry
264		c 2008-06-14
264	1	b American Chemical Society (ACS),c 2008
338		a print2 rdacarrier
500		a QC 20100719. Uppdaterad från manuskript till artikel (20100719).
520		a The effects of charge density, pH, and salt concentration on polyelectrolyte adsorption onto the oxidized surface of silicon wafers were studied using stagnation point adsorption reflectometry and quartz crystal microgravimetry. Five different polyelectrolytes-cationic polyacrylamides of four charge densities and one cationic dextran-were examined. The adsorption kinetics was characterized using each technique, and the adsorption kinetics observed was in line with the impinging jet theory and the theory for one-dimensional diffusion, respectively. The polyelectrolyte adsorption increased with pH as an effect of the increased silica surface charge. A maximum in the saturation adsorption for both types of polyelectrolytes was found at 10 mM NaCl concentration. A significant adsorption also occurred at I M NaCl, which indicated a significant nonionic contribution to the adsorption mechanism. The fraction of solvent in the adsorbed layer was determined to be 70-80% by combining the two analysis techniques. This indicated a loose structure of the adsorbed layer and an extended conformation at the surface, favoring loops and tails. However, considering the solution structure with a hydrodynamic diameter larger than 100 nm for the CPAM and a thickness of the adsorbed layer on the order of 10 nm, the results showed that the adsorption is accompanied by a drastic change in polymer conformation. Furthermore, this conformation change takes place on a time scale far shorter than seconds.
653		a Charge density; Concentration (process); Curve fitting; Electrolytes; Fluid dynamics; Fluid mechanics; Glucose; Nonmetals; Oxide minerals; pH effects; Polyelectrolytes; Polymers; Powders; Quartz; Reflection; Reflectometers; Silica; Silicate minerals; Silicon; Silicon compounds; Silicon wafers; Sodium alloys; Surface charge
653		a TECHNOLOGY
653		a TEKNIKVETENSKAP
700	1	a Wågberg, Larsu KTH,Fiber- och polymerteknologi4 aut0 (Swepub:kth)u14jbte3
710	2	a KTHb Fiber- och polymerteknologi4 org
773	0	t Langmuird : American Chemical Society (ACS)g 24:14, s. 7329-7337q 24:14<7329-7337x 0743-7463x 1520-5827
856	4 8	u https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-6014
856	4 8	u https://doi.org/10.1021/la800198e

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Av författaren/redakt...: Enarsson, Lars-E ...; Wågberg, Lars

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Av lärosätet: Kungliga Tekniska Högskolan

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