Properties of sol–gel derived scratch-resistant nano-porous silica films by a mixed atmosphere treatment

Wu, Guangming; Wang, Jue; Shen, Jun; Yang, Tianhe; Zhang, Qinyuan; Zhou, Bin; Deng, Zhiyong; Fan, Bin; Zhou, Difan; Zhang, Fengshan

doi:10.1016/s0022-3093(00)00257-x

Cited by 72 publications

(36 citation statements)

References 6 publications

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“…The extremely high solubility of NH3 in H2O results in the films to be much heavier. In addition, it has been reported that the hydroxyl groups can also be catalyzed into condensation by NH3 [46][47][48]. Consequently, when these films (both pristine and calcined) are exposed to NH3, they may also become stiffer and lighter because of the condensation of the hydroxyl groups, therefore, they could be explored as good sensing films for SAW NH3 sensors.…”

Section: Introductionmentioning

confidence: 99%

NH3 sensing property and mechanisms of quartz surface acoustic wave sensors deposited with SiO2, TiO2, and SiO2-TiO2 composite films

Tang

et al. 2018

Sensors and Actuators B: Chemical

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Northumbria University has developed Northumbria Research Link (NRL) to enable users to access the University's research output. Copyright © and moral rights for items on NRL are retained by the individual author(s) and/or other copyright owners. Single copies of full items can be reproduced, displayed or performed, and given to third parties in any format or medium for personal research or study, educational, or not-for-profit purposes without prior permission or charge, provided the authors, title and full bibliographic details are given, as well as a hyperlink and/or URL to the original metadata page. The content must not be changed in any way. Full items must not be sold commercially in any format or medium without formal permission of the copyright holder. The full policy is available online: http://nrl.northumbria.ac.uk/policies.html This document may differ from the final, published version of the research and has been made available online in accordance with publisher policies. To read and/or cite from the published version of the research, please visit the publisher's website (a subscription may be required.) This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. and SiO2-TiO2 films showed positive frequency shifts, whereas SiO2 film exhibits a negative frequency shift to NH3 gas. it is believed that the negative frequency shift was mainly caused by the increase of NH3 mass loading on the sensitive film while the positive frequency shift was associated to the condensation of the hydroxyl groups (-OH) on the film making the film stiffer and lighter, when exposed to NH3 gas. It demonstrated that humidity played a significant factor on the sensing performance. Comparative studies exhibited that the sensor based on the composite SiO2-TiO2 film had a much better sensitivity to NH3 at a low concentration level (1 ppm) with a response of 2 KHz, and also showed fast response and recovery, excellent selectivity, stability and reproducibility. Accepted Manuscript

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Section: Introductionmentioning

confidence: 99%

NH3 sensing property and mechanisms of quartz surface acoustic wave sensors deposited with SiO2, TiO2, and SiO2-TiO2 composite films

Tang

et al. 2018

Sensors and Actuators B: Chemical

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“…The production of reactive nanoscale silica from RH is a simple process compared to other conventional production techniques such as vapor phase reaction, sol-gel process, etc. [6,[20][21][22]. The emphasis of this paper is to optimize the conditions for the preparation of highly purified rice husk ash (RHA), of which nanosilica is then extracted, and to study its properties.…”

Section: Introductionmentioning

confidence: 99%

Optimization of synthesis and characterization of nanosilica produced from rice husk (a common waste material)

et al. 2012

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Rice husk (RH), an inexpensive waste material, was used to produce nanosilica. Acid treatment of RH followed by thermal combustion under controlled conditions gave 22.50% ash of which 90.469% was silica. Various chemical treatments in varied conditions for controlled combustion were investigated in order to produce highly purified nanosilica. The structural properties (such as X-ray diffraction, Brunauer-Emmett-Teller, Fourier transform infrared spectroscopy, and transmission electron microscopy) of the silica were studied. The method was optimized, and the chemical composition of the product was determined by X-ray fluorescence and carbon, hydrogen, and nitrogen analysis. Lime reactivity of the ashes was determined. At optimized conditions, a nanosized, highly purified silica (98.8 mass percentage) was produced with a high surface area, high reactivity, and 99.9% amorphous in form. Strength and number of acidic sites were measured by potentiometric titration. This nanosilica showed strong and a large number of acidic sites in comparison with commercial silica, making it as a good support for catalysts. This economic technology, as applied to waste material, also provides many benefits to the local agro-industry.

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“…Size and particle size distribution of silica particles highly affect the properties and quality of silica [1]. Nanosilica was successfully synthesized by various methods, including the sol-gel method, vapor-phase reaction, and the thermal decomposition method [2][3][4][5]. The sol-gel method presents many processing merits, due to facility, consistency, and cheapness, and obtained materials which have good purity and homogeneity [6,7].…”

Section: Introductionmentioning

confidence: 99%

“…Ryu has also obtained amorphous silica through the oxidation of silicon [12]. Santos and Vasconcelos [13] prepared porous silica glass via solgel process using tetramethylorthosilicate (TMOS), HNO 3 , and HF as precursor and catalysts, respectively. It is clear that the various parameters can affect the properties of silica nanoparticles prepared by sol-gel method.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Silica Nanoparticles by Ultrasound‐Assisted Sol‐Gel Method: Optimized by Taguchi Robust Design

Edrissi¹,

Soleymani²,

Adinehnia³

2011

Chem Eng & Technol

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Silica nanoparticles were prepared by ultrasound-assisted and conventional solgel method. The synthesis procedures were designed and optimized by the Taguchi experimental design method. Molar concentrations of TEOS, H 2 O, NH 4 OH, and reaction temperature were chosen as main factors. The results showed that the molar concentration of ammonia is the main factor which affects the particle size of the silica nanoparticles. The chemical structure, size, and morphology of the product were investigated by X-ray diffraction, Fourier transform infrared spectroscopy, laser light scattering, and scanning electron microscopy. By the optimum conditions of the ultrasound-assisted sol-gel method, silica nanoparticles with an average particle size of 13 nm were prepared.

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Properties of sol–gel derived scratch-resistant nano-porous silica films by a mixed atmosphere treatment

Cited by 72 publications

References 6 publications

NH3 sensing property and mechanisms of quartz surface acoustic wave sensors deposited with SiO2, TiO2, and SiO2-TiO2 composite films

NH3 sensing property and mechanisms of quartz surface acoustic wave sensors deposited with SiO2, TiO2, and SiO2-TiO2 composite films

Optimization of synthesis and characterization of nanosilica produced from rice husk (a common waste material)

Synthesis of Silica Nanoparticles by Ultrasound‐Assisted Sol‐Gel Method: Optimized by Taguchi Robust Design

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