FT-IR liquid attenuated total reflection study of TiO2SiO2 sol-gel reaction

Aizawa, Mamoru; Nosaka, Yoshio; Fujii, Nobutaka

doi:10.1016/0022-3093(91)90778-5

Cited by 71 publications

(33 citation statements)

References 13 publications

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“…10a) and then heated at 200°C (Fig. 10b) revealed the evolution of the bands attributed to the Si-O-Ti modes at 903 cm -1 (Schraml-Marth et al 1992; Aizawa et al 1991;Puzenat and Pichat 2003;Mihelčič et al 2014). The position of the corresponding band at 903 cm -1 remained practically the same for all Ti:Si ratios (Fig.…”

Section: Ir Transmission Spectramentioning

confidence: 81%

“…First, they were determined using attenuated total reflection (ATR) infrared spectroscopy and by focusing on the hydrolysis and condensation of the precursor solution under the same conditions as employed during the modification of the cotton fabric. Our main interest was to establish the presence of Si-O-Ti bonds within the sol-gel hybrids between silica and titania by analogy with previous infrared transmission (Schraml-Marth et al 1992) and ATR studies (Aizawa et al 1991) performed on silane coatings on titania particles (Puzenat and Pichat 2003;Mihelčič et al 2014). In addition, the existence of SiOH bands and Si-O-Si bonds (Mihelčič et al 2014;Brinker and Scherer 1990;Arkles and Larson 2004) in the hybrids and the presence of protonated amino groups in APTES (Bellamy 1954) were investigated using ATR.…”

Section: Introductionmentioning

confidence: 98%

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Bacteriostatic photocatalytic properties of cotton modified with TiO2 and TiO2/aminopropyltriethoxysilane

et al. 2015

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A new route for the functionalization of cotton fibres with organic-inorganic hybrid materials is proposed using titanium tetraisopropoxide (TiP) and aminopropyltriethoxysilane (APTES). The antimicrobial and photocatalytic activities of the new cotton finishes based on titania and mixed titania/amino-silica hybrids were tested by monitoring the growth of Escherichia coli (ATCC 25922) on the surfaces of functionalized fabrics under exposure to UV radiation and in the dark. Transmission electron microscopy revealed the amorphous nature of the hybrids and confirmed their similarity to other bactericidal aminofunctionalized polymers. Attenuated total reflection infrared spectra showed the protonated amino groups of the APTES in the TiP/APTES hybrid and the presence of Si-O-Ti bonding within the sol-gel hybrids between silica and titania by analogy with previous transmission and ATR infrared studies. Several analytical techniques were employed to establish the presence of the TiP and TiP/APTES modified cotton fibres. ATR measurements proved to be a very useful tool to study also the silane/-C-OH interactions between the hybrid materials and the cotton fibres, revealing the presence of covalent (i.e., -Si-O-C-) bonding with the OH functional group of cellulose. The advantages of the cotton finishes were demonstrated by the measured photocatalytic bacteriostatic effect, which persisted even after 15 washings; in contrast, the aminofunctionalized polymeric finishes, only showed a sufficient bacteriostatic effect. Furthermore, the TiP finishes were photocatalytically active, while the TiP/APTES finishes were not. The ultraviolet protective factor, degree of polymerization of the finished cotton samples were also investigated and revealed the suitability of the proposed method.

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Section: Ir Transmission Spectramentioning

confidence: 81%

Section: Introductionmentioning

confidence: 98%

Bacteriostatic photocatalytic properties of cotton modified with TiO2 and TiO2/aminopropyltriethoxysilane

et al. 2015

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“…Polymeric phases used in ceramic-reinforced sol-gel polymerization include elastomers, glassy polymers, semicrystalline polymers, and other polymeric media, such as membranes of perfluorosulfonate (Nafion ® ) [16 -18], whilst organometallic compounds (M(OC n H 2n+1 ) y , where M = Si, Ti, Al, Zr, etc. ), particularly tetraethoxysilane (TEOS), are commonly used as the ceramic precursor [19,20].…”

Section: Introductionmentioning

confidence: 99%

Characterizing polycaprolactone/SiO2–TiO2 nanocomposites synthesized via in situ sol–gel polymerization

2007

Designed Monomers and Polymers

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Abstract-In this study a polycaprolactone (PCL) or PCL-g-AA continuous phase was hybridized with a combined silicic acid and TTIP ceramic precursor via an in situ sol-gel process to create either PCL/SiO 2 -TiO 2 or PCL-g-AA/SiO 2 -TiO 2 hybrids in order to identify the superior composite in terms of desired properties. Composites were characterized using FT-IR spectroscopy, 29 Si solid-state NMR, XRD, DSC, TGA and Instron mechanical testing. It was found that PCL-g-AA/SiO 2 -TiO 2 was the superior hybrid, owing to the carboxylic acid groups of acrylic acid acting as coordination sites for the SiO 2 -TiO 2 phase to form chemical bonds. Moreover, PCL-g-AA/SiO 2 -TiO 2 10 wt% SiO 2 -TiO 2 produced the maximum values for tensile strength and glass transition temperature. The 29 Si solid-state NMR spectra showed that Si atom coordination around SiO 4 units is predominantly Q 3 and Q 4 .

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“…These difficulties come from the reactivity of titanium alkoxide, which is much higher than that of silicon alkoxide. 3,12,13 The hydrolysis rate of titanium alkoxide is much faster than that of silicon alkoxide. With the coexistence of surfactants such as alkyltrimethylammonium ion, layered silica is obtained by two-dimensional growth in aqueous solution; in contrast, spherical particles of titanium oxide are usually obtained from titanium alkoxide in the same aqueous environment.…”

Section: Introductionmentioning

confidence: 99%

Preparation of a transparent and flexible self-standing film of layered titania/isostearate nanocomposite

et al. 2005

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A titania-based self-standing film with high transparency and flexibility was successfully prepared via a sol-gel process, in which a titanium tetraisopropoxide/ isostearate complex (precursor), n-hexylammonium isostearate (catalyst), and o-xylene (solvent) were used. The sol obtained by the sol-gel reaction was floated on a water surface to form an unsupported film. This film was composed of a titania/isostearate nanocomposite with ordered layer structure. The basal spacings of the nanocomposites depended on the chain length of the carboxylate modifier.

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FT-IR liquid attenuated total reflection study of TiO2SiO2 sol-gel reaction

Cited by 71 publications

References 13 publications

Bacteriostatic photocatalytic properties of cotton modified with TiO2 and TiO2/aminopropyltriethoxysilane

Bacteriostatic photocatalytic properties of cotton modified with TiO2 and TiO2/aminopropyltriethoxysilane

Characterizing polycaprolactone/SiO2–TiO2 nanocomposites synthesized via in situ sol–gel polymerization

Preparation of a transparent and flexible self-standing film of layered titania/isostearate nanocomposite

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