Behavior of hydrophobic aerogel used as a Cherenkov medium

Gougas, A.; Ilie, Diana; Ilie, S.; Pojidaev, V.

doi:10.1016/s0168-9002(98)01192-9

Cited by 18 publications

(9 citation statements)

References 7 publications

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“…As is known, for a given value of n, d has a well defined minimum as a function of y. This fact is commonly used [10,12] to extract values of n, by simply searching for the corresponding minimum value of d. This method has the advantage of avoiding a precise determination of y, relying only on how well the minimum d value can be established. Here we use an alternative method, in which several measurements of d, around the expected minimum (using Eq.…”

Section: Dispersion Lawmentioning

confidence: 99%

“…Previous research was carried out [10] for an SP-30 version of it, used for the threshold counter which was flown aboard the Space Shuttle ''Discovery'' in the STS-91 mission in 1998. The Physics program of the forthcoming phase of the AMS experiment has prompted the development of a less dense (r ¼ 0:09 g=cm 3 ), SP-25 AGL 1 having nominal refractive index n ¼ 1:025, for the RICH counter.…”

Section: Introductionmentioning

confidence: 99%

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Measurement of the dispersion law for hydrophobic silica aerogel SP-25

Villoro

Plascencia

Nuñez

et al. 2002

Nuclear Instruments and Methods in Physics Research Section A:

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Section: Dispersion Lawmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Measurement of the dispersion law for hydrophobic silica aerogel SP-25

Villoro

Plascencia

Nuñez

et al. 2002

Nuclear Instruments and Methods in Physics Research Section A:

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“…[6][7][8] Silica aerogels are to date the solids with the largest porosities and can be produced by sol-gel routes which include specific drying procedures that do not affect the high porosity associated to the open and branched solid network formed in the wet gel. 9,10 The combination of large porosity and hydrophobicity has been shown to make aerogels technologically relevant materials in a broad range of applications from thermal insulation, 11,12 to drug delivery, 13 and Cherenkov detector 14 and their development still attracts a lively interest. 15 The sorption properties of silica aerogels, associated to their high surface area and porosity, are well documented.…”

Section: Introductionmentioning

confidence: 99%

Incorporation of graphene into silica-based aerogels and application for water remediation

et al. 2016

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Graphene/silica nanocomposites in the form of highly porous aerogels are obtained for the first time by integrating a novel approach for the production of low defectivity graphene with a two-step route for the synthesis of silica-based monolith. Differently from the other synthetic methods, the use of co-gelation of dispersed phase and matrix followed by high temperature supercritical drying leads to well dispersed bilayered graphene inside a high surface area silica matrix with an open texture porosity. Physico-chemical characterization provides evidence that the developed graphene/SiO2 bulk aerogel nanocomposites combine the distinct features of both the dispersed graphene sheets and of the porous silica aerogel matrix. It was found that incorporation of graphene in the aerogel, even at low loading, increases significantly the hydrophobic behaviour of the materials. This, combined with the high surface/volume ratio of the aerogel, makes the resulting nanocomposite a suitable candidate as a novel oil sorbent for water remediation. In particular, the developed graphene/silica aerogels selectively and quickly uptake oil, up to more than 7 times the aerogel sorbent mass, from oilwater mixtures, and keeps floating on water after absorbing the oil phase. The suitability of the developed composites as a class of novel sorbents for environmental remediation in the occurrence of flammable liquid spills, where burning represents a major threat, is supported by specific features of silica aerogels such as a relative fire-resistance, in addition to the high porosity and hydrophobic nature.

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“…[1][2][3][4][5] Already more than 80 years ago Kistler prepared silica aerogels by supercritical drying of silica jelly. [6] Due to their unique properties aerogels are already used in a wide range of applications, including optical [7][8][9][10][11][12] and electrical applications, [13][14][15] applications in catalysis, [16][17][18] as well as in thermal [19,20] and acoustic insulations. [21,22] In comparison with silica aerogels, for instance, zirconia aerogels show even slightly better properties with respect to their thermal conductivity [23] or melting point.…”

Section: Introductionmentioning

confidence: 99%

Zirconia‐based Aerogels via Hydrolysis of Salts and Alkoxides: The Influence of the Synthesis Procedures on the Properties of the Aerogels

Schäfer

Brandt

Milow

et al. 2013

Chemistry An Asian Journal

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This contribution aims at evaluating different synthesis procedures leading to zirconia-based aerogels. A series of undoped and yttrium-doped zirconia aerogels have been prepared via hydrolysis and condensation reaction of different alkoxy- and different inorganic salt-based precursors followed by supercritical drying. Well-established but deleterious zirconium n-propoxide (TPOZ) or zirconium n-butoxide (TBOZ) were used as metal precursors in combination with acids like nitric acid and acetic acid as auxiliary agent for the generation of non-yttrium stabilized zirconia aerogels. Yttrium-stabilized zirconia aerogels as well as pure zirconia aerogels were obtained by the salt route starting from ZrCl4 and crosslinking agents like propylene oxide or acetylacetone. The characteristics of the products were analyzed by nitrogen adsorption measurements, electron microscopy, and X-ray scattering. It turned out that with respect to all relevant properties of the aerogels as well as the practicability of the synthesis procedures, approaches based on inexpensive non-toxic salt precursors are the methods of choice. The salt-based approaches allow not only for low-cost, easy-to-handle synthesis procedures with realizable gelation times of less than 60 seconds, but also delivered the products with the highest surface area (449 m(2) g(-1) for ZrCl4) within this series of syntheses.

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Behavior of hydrophobic aerogel used as a Cherenkov medium

Cited by 18 publications

References 7 publications

Measurement of the dispersion law for hydrophobic silica aerogel SP-25

Measurement of the dispersion law for hydrophobic silica aerogel SP-25

Incorporation of graphene into silica-based aerogels and application for water remediation

Zirconia‐based Aerogels via Hydrolysis of Salts and Alkoxides: The Influence of the Synthesis Procedures on the Properties of the Aerogels

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