Synthesis and characterisation of cellulose/silica hybrids obtained by heteropoly acid catalysed sol–gel process

Sequeira, Sónia; Evtuguin, Dmitry V.; Portugal, Inês; Esculcas, A.P.

doi:10.1016/j.msec.2006.04.007

Cited by 111 publications

(88 citation statements)

References 15 publications

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“…Atomic Force Microscopy (AFM) has been largely employed for textural analysis of silica gel, [32][33] organic-inorganic hybrids prepared by the sol-gel method, [34][35] and for the study the mechanism of self-assembled monolayer growing of octadecyltrichlorosilane on oxidized silicon substrate. [36][37] In the present study, AFM was employed for the textural characterization in terms of surface morphology, and roughness of some silicas obtained by the sol-gel method.…”

Section: Effect Of the Teos/ods Molar Ratio On The Morphology And Texmentioning

confidence: 99%

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Spherical and lamellar octadecylsilane hybrid silicas

Brambilla

Pires

Silveira

et al. 2008

Journal of Non-Crystalline Solids

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Section: Effect Of the Teos/ods Molar Ratio On The Morphology And Texmentioning

confidence: 99%

“…Force Microscopy (AFM) [22][23][24] have been employed for the textural and morphological characterization of hybrid materials.…”

mentioning

confidence: 99%

Spherical and lamellar octadecylsilane hybrid silicas

Brambilla

Pires

Silveira

et al. 2008

Journal of Non-Crystalline Solids

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“…These nanocomposite materials are of interest for the creation of membranes, sorbents, and catalysts operating in gas, aqueous, and organic liquid media. The materials under consideration show promise for solving problems of environmental pro tection from various molecular, ionic, and fine pollut ants [5][6][7][8][9][10][11]. Membranes based on cellulose diacetate are well known and are manufactured and employed in various countries [12].…”

mentioning

confidence: 99%

Preparation and properties of silicon- and titanium-containing hybrid nanocomposite films based on ethyl cellulose

et al. 2013

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Abstract-Nanocomposite hybrid films containing silicon and titanium compounds in the polymer matrix are prepared through the sol gel method via the hydrolytic polycondensation of Si and Ti alkoxides (tetra ethoxysilane and titanium tetrabutoxide) in the THF solution of a hydrophobic polymer, ethyl cellulose. Their structure and properties are studied with the use of a complex of physicochemical methods. During the hydrolysis of tetraethoxysilane and the subsequent polycondensation of the reaction products, silicon atoms are incorporated into the polymer and form -O-Si-O-bonds involving hydroxyl groups of ethyl cellulose. In the sol gel method, titanium alkoxide yields nanosized particles of titanium dioxide that play the role of fillers in the polymer matrix. Titanium containing films show solubility in THF and, after prolonged contact with the solvent, precipitate titanium dioxide from the solution. Hybrid films containing silicon are insoluble owing to the formation of a chemical network between polymer molecules and Si-OH groups of the products of hydrolysis of silicon alkoxide, as confirmed by the IR data. It is shown that the amounts and types of alkox ides and the diameters of the structures formed in the polymer matrix via the sol gel procedure affect the hydrophilicity levels of ethyl cellulose hybrid films and their abilities to swell in water and aqueous solutions of organic dyes (brilliant blue and methylene blue). Ethyl cellulose hybrid films are hydrophilic, and they facilitate the removal of dye molecules from aqueous solutions. The best properties are featured by the films containing nanosized particles of titanium dioxide in the polymer matrix.

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“…Organo-silicon compounds containing siloxane bonds (Si-O) usually own good heat resistance, weatherability, and insulation, and are widely used as functional materials in several technologies including those associated with the electronics industry [34]. Previous reports have used the stability of the siloxane bond to improve the thermal stability of cellulose [35,36]. However, these studies were conducted on coating cellulose fiber surfaces with silicon compounds, in addition to hydroxyl group substitution.…”

Section: Improvements In Heat Resistance Of Cellulose Fiber By Surfacmentioning

confidence: 99%

<b>Improvements in Heat Resistance of Cellulose Fiber by Surface Silylation</b>

Ino

Kimura

et al. 2013

Sen-i Gakkaishi

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In this study, an improvement in the heat resistance of cellulose fibers was achieved via the introduction of thermally stable siloxane bonds (Si-O), which were formed by promoting the reaction of cellulose hydroxyl groups with an organo-silicon compound. Currently, there are a number of green composite materials based on the system of cellulose fiber reinforcement and thermoplastic resin matrices. However, the heat application in the molding process introduces important issues for these materials such as the easy degradation of cellulose fibers, during which they become weak, discolored and odorous. Here, the heat resistance improvement of cellulose in the green composite at around the molding temperature (160−240°C) is discussed. The heat-resistant, modified cellulose was analyzed using scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), thermogravimetric (TG) analysis, and tensile testing. The SEM and XPS results show that the surfaces of the samples are smooth, with no significant change in the diameters of the cellulose fibers upon Si introduction. After heat treatment of the modified cellulose fibers at temperatures ranging from 160 to 240°C, the deterioration of the tensile strength of the modified cellulose fibers was suppressed. The tensile test and TG analysis also indicated that the degree of degradation of the cellulose fibers decreases with increasing organo-silicon weight fraction.

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Synthesis and characterisation of cellulose/silica hybrids obtained by heteropoly acid catalysed sol–gel process

Cited by 111 publications

References 15 publications

Spherical and lamellar octadecylsilane hybrid silicas

Spherical and lamellar octadecylsilane hybrid silicas

Preparation and properties of silicon- and titanium-containing hybrid nanocomposite films based on ethyl cellulose

<b>Improvements in Heat Resistance of Cellulose Fiber by Surface Silylation</b>

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