Transparent Silica Aerogel Blocks for High-Energy Physics Research

Yokogawa, Hiroshi

doi:10.1007/978-1-4419-7589-8_28

Cited by 4 publications

(2 citation statements)

References 23 publications

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“…The hydrophobicity of aerogels is very importance for their wide used in practical applications [ 33 ]. However, the hydrophobicity of the aerogels will decrease with increasing TMOS due to the increase of hydroxyl group on the particle surface.…”

Section: Resultsmentioning

confidence: 99%

A Co-Precursor Approach Coupled with a Supercritical Modification Method for Constructing Highly Transparent and Superhydrophobic Polymethylsilsesquioxane Aerogels

Lei

Sun

et al. 2018

Molecules

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Polymethylsilsesquioxane (PMSQ) aerogels obtained from methyltrimethoxysilane (MTMS) are well-known high-performance porous materials. Highly transparent and hydrophobic PMSQ aerogel would play an important role in transparent vacuum insulation panels. Herein, the co-precursor approach and supercritical modification method were developed to prepare the PMSQ aerogels with high transparency and superhydrophobicity. Firstly, benefiting from the introduction of tetramethoxysilane (TMOS) in the precursor, the pore structure became more uniform and the particle size was decreased. As the TMOS content increased, the light transmittance increased gradually from 54.0% to 81.2%, whereas the contact angle of water droplet decreased from 141° to 99.9°, ascribed to the increase of hydroxyl groups on the skeleton surface. Hence, the supercritical modification method utilizing hexamethyldisilazane was also introduced to enhance the hydrophobic methyl groups on the aerogel’s surface. As a result, the obtained aerogels revealed superhydrophobicity with a contact angle of 155°. Meanwhile, the developed surface modification method did not lead to any significant changes in the pore structure resulting in the superhydrophobic aerogel with a high transparency of 77.2%. The proposed co-precursor approach and supercritical modification method provide a new horizon in the fabrication of highly transparent and superhydrophobic PMSQ aerogels.

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Section: Resultsmentioning

confidence: 99%

A Co-Precursor Approach Coupled with a Supercritical Modification Method for Constructing Highly Transparent and Superhydrophobic Polymethylsilsesquioxane Aerogels

Lei

Sun

et al. 2018

Molecules

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“…Aerogels have been used for nuclear reaction performed by inertial confinement fusion and for Cerenkov radiators (Kim and Jang 1991;Hrubesh 1998;Yokogawa 2011). Transparent aerogels with low refractive index are interesting as Cerenkov counter in high-energy physics.…”

Section: Aerogels and Applicationsmentioning

confidence: 99%

Aerogel Processing

Woignier¹,

Phalippou²,

Despetis³

et al. 2018

Handbook of Sol-Gel Science and Technology

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One of the problems largely commented in the sol-gel science is how to make large bodies, because gels tend to crack during drying. The drying stresses are attributed to capillary phenomena and differential strain which result from a pressure gradient in the pore liquid. By the supercritical drying (SCD), the capillary stresses are eliminated and monolithic aerogel can be obtained. This chapter focuses on silica aerogel, the most studied aerogel. It presents an overview of the supercritical drying techniques, but also some of the remarkable

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