title: Quartz crystal microbalance with dissipation monitoring and surface plasmon resonance studies of carboxymethyl cellulose adsorption onto regenerated cellulose surfaces.
abstract: Adsorption of anionic polyelectrolytes, sodium salts of carboxymethyl celluloses (CMCs) with different degrees of substitution (DS = 0.9 and 1.2), from aqueous electrolyte solutions onto regenerated cellulose surfaces was studied using quartz crystal microbalance with dissipation monitoring (QCM-D) and surface plasmon resonance (SPR) experiments. The influence of both calcium chloride (CaCl(2)) and sodium chloride (NaCl) on CMC adsorption was examined. The QCM-D results demonstrated that CaCl(2) (divalent cation) caused significantly greater CMC adsorption onto regenerated cellulose surfaces than NaCl (monovalent cation) at the same ionic strength. The CMC layers adsorbed onto regenerated cellulose surfaces from CaCl(2) solutions exhibited greater stability upon exposure to flowing water than layers adsorbed from NaCl solutions. Both QCM-D and SPR results showed that CMC adsorption onto regenerated cellulose surfaces from CaCl(2) solutions increased with increasing CaCl(2) concentration up to the solubility limit (10 mM). Voigt-based viscoelastic modeling of the QCM-D data indicated that the CMC layers adsorbed onto regenerated cellulose surfaces had shear viscosities of η(f) ≈ 10(-3) N·s·m(-2) and elastic shear moduli of μ(f) ≈ 10(5) N·m(-2). Furthermore, the combination of SPR spectroscopy and QCM-D showed that the CMC layers contained 90-95% water. Adsorption isotherms for CMCs in CaCl(2) solutions were also obtained from QCM-D and were fit by Freundlich isotherms. This study demonstrated that CMC adsorption from CaCl(2) solutions is useful for the modification of cellulose surfaces.
authors.affiliation: Department of Chemistry, Virginia Tech, Blacksburg, Virginia 24061, United States.
authors.forename: Zelin
authors.initials: Z
authors.lastname: Liu
authors.forename: Heejun
authors.initials: H
authors.lastname: Choi
authors.forename: Paul
authors.initials: P
authors.lastname: Gatenholm
authors.forename: Alan R
authors.initials: AR
authors.lastname: Esker
mesh_terms: D000327:Adsorption; D002122:Calcium Chloride / Q000737:chemistry; D002266:Carboxymethylcellulose Sodium / Q000737:chemistry*; D002384:Catalysis; D005740:Gases / Q000737:chemistry; D006851:Hydrochloric Acid / Q000737:chemistry; D011108:Polymers / Q000737:chemistry; D058525:Quartz Crystal Microbalance Techniques; D012492:Salts / Q000737:chemistry; D012965:Sodium Chloride / Q000737:chemistry; D020349:Surface Plasmon Resonance; D013499:Surface Properties; D055682:Viscoelastic Substances / Q000737:chemistry
chemical_list: D005740:Gases; D011108:Polymers; D012492:Salts; D055682:Viscoelastic Substances; D012965:Sodium Chloride; D002266:Carboxymethylcellulose Sodium; D002122:Calcium Chloride; D006851:Hydrochloric Acid