title: Rheology of dispersions of xanthan gum, locust bean gum and mixed biopolymer gel with silicon dioxide nanoparticles.
abstract: Mixed xanthan gum (XG) and locust bean gum (LBG) biopolymers form thermally reversible gels of interest in tissue engineering and drug delivery. 1% solutions of XG, LBG and 1:1 ratio XG/LBG mixed gels (LX) containing silicon dioxide (SiO2) nanoparticles were rheologically characterized with respect to nanoparticle concentration and temperature. 10% nanoparticles in XG created larger domains of associated polymer, resulting in enhanced viscosity and viscoelastic moduli. In LBG with 10% particles, transient viscosity and a gel-sol transition occurred due to particle bridging and aggregation. In the LX gel, 10% SiO2 particles caused an increase in elasticity. When ramping temperature from 25°C to 85°C, the complex modulus for all solutions containing 10% SiO2 was relatively constant, indicating that nanoparticles counteracted the effect of temperature on the material properties. Understanding the influence of nanoparticle loading on material properties is necessary for biopolymer material development where property prediction and control are critical.
authors.affiliation: Mechanical and Industrial Engineering, Montana State University, 220 Roberts Hall, Bozeman, MT 59717, United States.
authors.forename: Jordan R M
authors.initials: JR
authors.lastname: Kennedy
authors.affiliation: Chemical and Biological Engineering, Montana State University, 306 Cobleigh Hall, Bozeman, MT 59717, United States.
authors.forename: Katherine E
authors.initials: KE
authors.lastname: Kent
authors.affiliation: Chemical and Biological Engineering, Montana State University, 306 Cobleigh Hall, Bozeman, MT 59717, United States. Electronic address: jbrown@coe.montana.edu.
authors.forename: Jennifer R
authors.initials: JR
authors.lastname: Brown
mesh_terms: D016503:Drug Delivery Systems; D005685:Galactans / Q000737:chemistry*; D005782:Gels; D008351:Mannans / Q000737:chemistry*; D053149:Plant Gums / Q000737:chemistry*; D011135:Polysaccharides, Bacterial / Q000737:chemistry*; D012212:Rheology; D012822:Silicon Dioxide / Q000737:chemistry*
chemical_list: D005685:Galactans; D005782:Gels; D008351:Mannans; D053149:Plant Gums; D011135:Polysaccharides, Bacterial; D012822:Silicon Dioxide; C002563:xanthan gum; C017471:locust bean gum
keywords: Locust bean gum; Rheology; Silicon dioxide nanoparticles; Thermally reversible gels; Xanthan gum