Optical and mechanical properties of TiO2/SiO2/organically modified silane composite films prepared by sol–gel processing

Que, Wenxiu; Sun, Zhuo; Zhou, Yan; Lam, Yee Loy; Chan, Yuen Chuen; Kam, C. H.

doi:10.1016/s0040-6090(99)00746-4

Cited by 99 publications

(46 citation statements)

References 37 publications

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“…The SOLKOTE sample has a somewhat weaker absorption centred at around 9 µm giving it an emittance slightly better than that of the C-SiO 2 sample. The C-SiO 2 sample suffers additionally due to water absorption between 2.5 and 3 µm, signifying the hydrophilic nature of SiO 2 [10,11]. It is quite evident that both the CNiO and C-ZnO samples show very little to no absorption in the infrared wavelength range.…”

Section: Resultsmentioning

confidence: 99%

Solar selective absorber functionality of carbon nanoparticles embedded in SiO₂, ZnO and NiO matrices

Katumba

Makiwa

Baisitse

et al. 2008

Phys. Status Solidi (c)

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It is possible to design an optical material, through control of the substrate and coatings, to absorb a large fraction of the solar spectrum and to emit very little radiation energy in the near and far infra‐red wavelength range. This requires a coating structure that transmits in the ultraviolet and visible, but reflects in the near and far infrared, with a sharp drop in transmission near 2 (m. In this paper, we report on selective solar absorber coatings of carbon nano‐particles embedded in SiO2, ZnO and NiO matrices, fabricated by a sol‐gel technique. The coatings were tested on aluminium substrates. UV‐VIS and FTIR spectroscopies were used to determine the spectral response of the composite coatings, from which the solar absorptance and thermal emittance were determined. We show that the NiO matrix samples have the best solar selective behaviour, and suggest a theoretical evaluation framework for future comparison of such materials. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Section: Resultsmentioning

confidence: 99%

Solar selective absorber functionality of carbon nanoparticles embedded in SiO₂, ZnO and NiO matrices

Katumba

Makiwa

Baisitse

et al. 2008

Phys. Status Solidi (c)

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“…39,40 The thermal properties of hybrids with various titania contents were obtained via DSC and TGA tests, and the results are given in Table III. The glass transition temperature (T g ) of the hybrid composites is associated with a cooperative motion of long-chain segments, which may be hindered by the titania network.…”

Section: Thermal Stability Of Hybrids (Dsc and Tga Tests)mentioning

confidence: 99%

In situ polymerization of titanium isopropoxide in polycaprolactone: Properties and characterization of the hybrid nanocomposites

2004

J of Applied Polymer Sci

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ABSTRACT:In this study, tetra isopropyl ortho titanate (TTIP) and polycaprolactone (PCL) were chosen as the ceramic precursor and the continuous phase, respectively, for the preparation of novel nanocomposites by using an in situ sol-gel process. In addition, acrylic acid grafted polycaprolactone (PCL-g-AA) was investigated as an alternative to PCL. The hybrids (PCL/TiO 2 and PCL-g-AA/TiO 2 ) were characterized via Fourier transform infrared (FTIR) spectroscopy, dynamic mechanical thermal analysis (DMA), X-ray diffraction (XRD), differential scanning calorimetry (DSC), thermogravimetry analysis (TGA), and Instron mechanical testing. It was found that the carboxylic acid groups of acrylic acid acted as coordination sites for the titania phase to form chemical bonds, thus improving the properties of the acrylic acid grafted composite compared with its acrylicacid-free counterpart. The TiO 2 content also determined the strength of interfacial bonding between the polymer chains and the ceramic phase, as shown by changes in glass transition temperature (T g ) with TiO 2 content. The maximum values of tensile strength and T g were obtained with the PCL-g-AA/TiO 2 composite at 10 wt % TiO 2 . At TiO 2 contents above this, excess particles led to segregation between the organic and inorganic phases.

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“…Significant research has focussed on methods of stabilising nano-sized TiO 2 particles on different supports to prevent agglommeration. TiO 2 particles have been immobilised on silica nanospheres [28] and thin films [26,[29][30][31], on Fe-filled carbon nanocapsules [32], within the interlayer spaces of pillared clays [4,33] and on the surface of exfoliated clay sheets, such as laponite .…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterisation of clay-supported titania photocatalysts

Daniel

Frost

Zhu

2007

Journal of Colloid and Interface Science

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This study examines the use of laponite, a synthetic smectite, which forms exfoliated silicate layers when dispersed in water, as an inorganic support for titania nanocrystals. Titania nanocrystals are prepared prior to addition to the clay dispersion, by a sol-gel synthesis incorporating a microwave hydrothermal step. The characteristics of the resultant structure such as titania phase, crystallite size and particulate size are examined via X-Ray Diffraction (XRD), Transmission Electron Spectroscopy (TEM) and Infrared Spectroscopy.

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Optical and mechanical properties of TiO2/SiO2/organically modified silane composite films prepared by sol–gel processing

Cited by 99 publications

References 37 publications

Solar selective absorber functionality of carbon nanoparticles embedded in SiO₂, ZnO and NiO matrices

Solar selective absorber functionality of carbon nanoparticles embedded in SiO₂, ZnO and NiO matrices

In situ polymerization of titanium isopropoxide in polycaprolactone: Properties and characterization of the hybrid nanocomposites

Synthesis and characterisation of clay-supported titania photocatalysts

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Optical and mechanical properties of TiO2/SiO2/organically modified silane composite films prepared by sol–gel processing

Cited by 99 publications

References 37 publications

Solar selective absorber functionality of carbon nanoparticles embedded in SiO2, ZnO and NiO matrices

Solar selective absorber functionality of carbon nanoparticles embedded in SiO2, ZnO and NiO matrices

In situ polymerization of titanium isopropoxide in polycaprolactone: Properties and characterization of the hybrid nanocomposites

Synthesis and characterisation of clay-supported titania photocatalysts

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Solar selective absorber functionality of carbon nanoparticles embedded in SiO₂, ZnO and NiO matrices

Solar selective absorber functionality of carbon nanoparticles embedded in SiO₂, ZnO and NiO matrices