Interaction of poly(ethylene oxide) with fumed silica

Воронин, Е. Ф.; Gun'ko, V.М.; Guzenko, N.V.; Pakhlov, E.M.; Носач, Л. В.; Лебода, Р.; Skubiszewska–Zięba, J.; Malysheva, M. L.; Borysenko, M.V.; Chuĭko, A. A.

doi:10.1016/j.jcis.2004.06.073

Cited by 77 publications

(84 citation statements)

References 40 publications

(63 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Immobilization of water-soluble polymers (e.g. polyvinylpyrrolidone (PVP), poly(ethylene oxide) (PEO)) onto a surface of fumed silica (or other oxides) from aqueous medium can cause a diminution of dispersivity (and specific surface area by half) of the materials [373][374][375][376]. This effect is undesirable since it leads to a reduction of the adsorption capacity as well as other characteristics.…”

Section: Polymer/oxide Systemsmentioning

confidence: 99%

TSDC spectroscopy of relaxational and interfacial phenomena

Gun'ko

Zarko

Goncharuk

et al. 2007

Advances in Colloid and Interface Science

Self Cite

134

167

View full text Add to dashboard Cite

Section: Polymer/oxide Systemsmentioning

confidence: 99%

TSDC spectroscopy of relaxational and interfacial phenomena

Gun'ko

Zarko

Goncharuk

et al. 2007

Advances in Colloid and Interface Science

Self Cite

134

167

View full text Add to dashboard Cite

“…It has been reported that NSI filled polymer matrix composites show a significant improvement in mechanical and thermal properties [3][4][5]. Studies on NSI dispersion in polymer matrices like poly(methyl methacrylate) [6,7], high density polyethylene [8], and poly(ethylene oxide) [9] have been carried out. However, with the polymer matrices mentioned being hydrophobic in nature and NSI being hydrophilic, various types of surfactants or compatibilizers have been utilized to bring about compatibility between the two noninteracting phases [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…Studies on NSI dispersion in polymer matrices like poly(methyl methacrylate) [6,7], high density polyethylene [8], and poly(ethylene oxide) [9] have been carried out. However, with the polymer matrices mentioned being hydrophobic in nature and NSI being hydrophilic, various types of surfactants or compatibilizers have been utilized to bring about compatibility between the two noninteracting phases [6][7][8][9]. Some attention has also been addressed to nanocomposites based on silica and polymers like poly(vinyl alcohol) [10,11], poly(vinyl pyrrolidone), and chitosan [10].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of K-Carrageenan/Nanosilica Biocomposite Film

Rane

Savadekar

Kadam

et al. 2014

Journal of Materials

View full text Add to dashboard Cite

The purpose of this study is to improve the performance properties of K-carrageenan (K-CRG) by utilizing nanosilica (NSI) as the reinforcing agent. The composite films were prepared by solution casting method. NSI was added up to 1.5% in the K-CRG matrix. The prepared films were characterized for mechanical (tensile strength, tensile modulus, and elongation at break), thermal (differential scanning calorimetry, thermogravimetric analysis), barrier (water vapour transmission rate), morphological (scanning electron microscopy), contact angle, and crystallinity properties. Tensile strength, tensile modulus, and crystallinity were found to have increased by 13.8, 15, and 48% whereas water vapour transmission rate was found to have decreased by 48% for 0.5% NSI loaded K-CRG composite films. NSI was found to have formed aggregates for concentrations above 0.5% as confirmed by scanning electron microscopy. Melting temperature, enthalpy of melting, and degradation temperature of K-CRG increased with increase in concentration of NSI in K-CRG. Contact angle also increased with increase in concentration of NSI in K-CRG, indicating the decrease in hydrophilicity of the films improving its water resistance properties. This knowledge of the composite film could make beneficial contributions to the food and pharmaceutical packaging applications.

show abstract

“…Fumed silica possesses a large specific surface area and exhibits exceptional adsorptive affinity for various organic molecules in aqueous solution including proteins and polymers [26][27][28][29][30][31] . The adsorption of proteins onto fumed silica has been reported to be essentially irreversible 29,32 .…”

Section: Introductionmentioning

confidence: 99%

Immobilization of Candida antarctica Lipase B on fumed silica

Cruz

Pfromm

Rezac

2009

Process Biochemistry

View full text Add to dashboard Cite

Enzymes are usually immobilized on solid supports or solubilized when they are to be used in organic solvents with poor enzyme solubility. We have reported previously on a novel immobilization method for s. Carlsberg on fumed silica with results that reached some of the best previously reported catalytic activities in hexane for this enzyme. Here we extend our method to Candida antarctica lipase B (CALB) as an attractive target due to the many potential applications of this enzyme in solvents. Our CALB/fumed silica preparations approached the catalytic activity of commercial Novozym 435 for a model esterification in hexane at 90wt% fumed silica (relative to the mass of the preparation). An intriguing observation was that the catalytic activity at first increases as more fumed silica was made available to the enzyme but then decreased precipitously when 90wt% fumed silica was exceeded. This was not the case for s. Carlsberg where the catalytic activity leveled off at high relative amounts of fumed silica. We determined adsorption kinetics, performed variations of the pre-immobilization aqueous pH, determined the stability, and applied fluorescence microscopy to the preparations. A comparison with recent concepts by Gross et al. may point towards a rationale for an optimum intermediate surface coverage for some enzymes on solid supports.

show abstract

Interaction of poly(ethylene oxide) with fumed silica

Cited by 77 publications

References 40 publications

TSDC spectroscopy of relaxational and interfacial phenomena

TSDC spectroscopy of relaxational and interfacial phenomena

Preparation and Characterization of K-Carrageenan/Nanosilica Biocomposite Film

Immobilization of Candida antarctica Lipase B on fumed silica

Contact Info

Product

Resources

About