Study of interaction of poly(1-vinyl-2-pyrrolidone) with a surface of highly dispersed amorphous silica

Belyakova, L. A.; Varvarin, A. M.; Lyashenko, D. Yu.; Roik, N. V.

doi:10.1016/s0021-9797(03)00395-3

Cited by 18 publications

(14 citation statements)

References 11 publications

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“…9d͒; suggesting the interaction of CvO group of PVP and terminal silanol ͑Si-OH͒ of silica as hydrogen bonding. 19 Compared with the other works ͑10-40, 20 20,14 and 25.5 cm −121 ͒ this shift is small, corresponding to the weak interaction. This supposedly originates from the interaction among CvO groups of associated PVP …”

Section: E44contrasting

confidence: 55%

Redox Deposition of Silica Thin Films: Effect of Hydrogen Peroxide and Poly(vinylpyrrolidone) on Film Growth

Chigane¹,

Izaki²,

Hatanaka³

et al. 2008

J. Electrochem. Soc.

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Effects of H 2 O 2 and poly͑N-vinylpyrrolidone͒ ͑PVP͒ additives on silica thin-film deposition by the redox reaction of an aqueous ammonium hexafluorosilicate ͑AFS͒ solution with reducing agent dimethylamine borane onto poly͑ethylene terephthalate͒ ͑PET͒ and Si substrates were investigated. The trivial addition of H 2 O 2 ͑a few percent͒ and PVP ͑1 ppm͒ greatly improved the rate of film growth and the stability of reaction solution. X-ray photoelectron spectroscopic and infrared spectroscopic analyses as well as surface ͑scanning electron microscopy͒ and inner phase ͑transmission electron microscopy͒ morphological characterization of the silica films were performed using varying concentrations of PVP. A model for the manner of the silica-film deposition based on the attractive or repulsive interaction among silica spherical granular, PVP, and PET substrate was proposed.Congruently with the development of transparent plastics ͓poly-͑ethylene terephthalate͒ ͑PET͒, poly͑methyl methacrylate͒, and polycarbonate͔ as trendy replacements for glass substrates in the fields of optical devices, displays, and windows of buildings or automobiles, the demand for low-cost preparation methods of silica thin films as an antireflection material, gas barrier coatings, etc. are increasing. 1-5 Previously, we have cathodically prepared silica thin films from an aqueous solution of ammonium hexafluorosilicate ͓͑NH 4 ͒ 2 SiF 6 ͔ onto metal substrates. 6 Moreover, for lower or nonconductive substrates involving PET, an electroless process with reducing agent dimethylamine borane ͑DMAB͒, 7 called redox deposition, has been proposed, and antireflection characteristics to PET have been investigated. 8,9 The redox deposition process includes an initial oxidation and reduction of DMAB and water to alkaline dimethylamine and H 2 gas, respectively, leading to the increase of pH ͑Eq. 1͒ ͓1͔ by which the formation ͑Eq. 2͒ and polymerization ͑Eq. 3͒ of hydroxide species is caused, resulting in silica film depositionThe method can be characterized as an inorganic sol-gel process triggered by the electrochemical reaction ͑Eq. 1͒ in an aqueous media and using inorganic silicon source, where advantageous cost effectiveness of preferential silica formation in the vicinity of substrate, free from organic solvents, alkoxides, and heat-treatment, over the conventional sol-gel method can be claimed. Our previous investigation on the time course of the redox deposition has shown that the essential film growth starts after an induction period that is shorter in the case of a higher initial concentration of DMAB. 8 Moreover, an excellent antireflection film ͑0.3% at 550 nm͒ was obtained by the two-step immersion process from comparable highly DMAB-concentrated ͑200 mmol dm −3 ͒ solutions. 9 Although higher initial DMAB concentration is effective for the initial reaction rate, the excess use of DMAB is costly and results in un-needed formation of silica particles in the solution bulk. Therefore, adequate agents activating DMAB decomposition and preventing the...

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Section: E44contrasting

confidence: 55%

Redox Deposition of Silica Thin Films: Effect of Hydrogen Peroxide and Poly(vinylpyrrolidone) on Film Growth

Chigane¹,

Izaki²,

Hatanaka³

et al. 2008

J. Electrochem. Soc.

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“…1•DAY ACUVUE Ò brand does not feel as slippery. Belyakova et al [24] reported a strong attraction between PVP and silicon dioxide. The higher coefficient of friction observed for 1•DAY ACUVUE Ò MOIST TM brand lens is attributed to an attractive interaction between PVP in the 1•DAY ACUVUE Ò MOIST TM brand lens matrix and hydrophilic glass surface.…”

Section: Discussionmentioning

confidence: 99%

Friction Measurements on Contact Lenses in Their Operating Environment

et al. 2011

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An important issue concerning the use of soft contact lenses is comfort, which, among other factors, has been related to the level of friction between the anterior side of the lens and the inner eyelid. Although several studies have been carried out to investigate the frictional properties of contact lenses, these have not taken the physiological environment of the eye into account. In use, lenses are in contact with proteins present in tears, with corneal cells and with the palpebral conjunctiva (clear membrane on inner eyelid). The focus of this study was to establish a biologically relevant measurement protocol for the investigation of friction of contact lenses that would mimic the eye's physiological environment. By optimizing parameters such as the composition of the friction counter surface, the lubricant solution, the normal load and the velocity, an ideal protocol and setup for microtribological testing could be established and used to perform a comparative study of various commercially available soft contact lenses.

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“…Due to its nontoxicity, biocompatibility and good complexing properties for ionic or p‐electron system PVP is widely used in different fields: beauty, textile and chemical industry, pharmacy, medicine. In medicine, PVP is applied as a solution substituting for plasma of blood, in the organism detoxication, for vitreous body substitutes, and as nontoxic polymeric matrices 1–6. Hydrogels based on poly(1‐vinyl‐2‐pyrrolidone) have been widely used in controlled drug release materials, cell encapsulation, scaffold materials, contact lenses, burn wounds dressings, artificial cartilages or membranes, and for the encapsulation of living cells 7–15…”

Section: Introductionmentioning

confidence: 99%

Characterization of macroporous 1‐vinyl‐2‐pyrrolidone copolymers obtained by suspension polymerization

Maciejewska

2011

J of Applied Polymer Sci

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Radical suspension copolymerization of 1-vinyl-2-pyrrolidone (VP) with three different cross-linkers: divinylbenzene (DVB), trimethylolpropane trimethacrylate (TRIM), and di(methacryloxymethyl) naphthalene (DMN) was used to prepare macroporous microspheres. During the copolymerization, the mixture of toluene and n-dodecane as a pore-forming diluent was used. All samples were characterized in terms of particle size and distribution, nitrogen content, specific surface area total pore volume, and pore size distribution. It was found that specific surface area of the obtained beads is strongly dependent on the diluent system and the type of cross-linker and achieves value from 27 to 845 m 2 /g. To determine the influence of chemical structure of cross-linkers on the selectivity and polarity of the copolymers, inverse gas chromatography was applied. In addition, VP-DVB and VP-DMN copolymers were modified by sulfonation into cation-exchangers with cation exchange capacity equal 1.98 and 2.31 mmol/g, respectively.

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Study of interaction of poly(1-vinyl-2-pyrrolidone) with a surface of highly dispersed amorphous silica

Cited by 18 publications

References 11 publications

Redox Deposition of Silica Thin Films: Effect of Hydrogen Peroxide and Poly(vinylpyrrolidone) on Film Growth

Redox Deposition of Silica Thin Films: Effect of Hydrogen Peroxide and Poly(vinylpyrrolidone) on Film Growth

Friction Measurements on Contact Lenses in Their Operating Environment

Characterization of macroporous 1‐vinyl‐2‐pyrrolidone copolymers obtained by suspension polymerization

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