Heat insulation properties of silica aerogel/glass fiber composites fabricated by press forming

Yuan, Bo; Ding, Shuqiang; Wang, Dongdong; Wang, Gang; Li, Hongxia

doi:10.1016/j.matlet.2012.01.114

Cited by 177 publications

(60 citation statements)

References 8 publications

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“…[5] Thepreparation of silica aerogels with improved mechanical properties is well-documented. Three common routes to strengthen the gel network are:1)chemical crosslinking with reactive molecules or polymers, [6] 2) impregnating or dispersing individual micro/nanoscopic secondary phases,s uch as polymers, [7] nanoparticles, [8] nanotubes, [9] or fibers, [10] into the silica matrix, and 3) using macroscopic fibrous templates made from polyester, [11] non-woven polypropylene, [12] fiberglass, [13] polyamide, [14] or electrospun polyurethane. [9] Among these strategies,c hemical crosslinking with synthetic polymers (route 1) achieves the most significant improvement in the mechanical properties (ca.…”

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confidence: 99%

Strong, Thermally Superinsulating Biopolymer–Silica Aerogel Hybrids by Cogelation of Silicic Acid with Pectin

et al. 2015

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International audienceSilica aerogels are excellent thermal insulators, but their brittle nature has prevented widespread application. To overcome these mechanical limitations, silica–biopolymer hybrids are a promising alternative. A one-pot process to monolithic, superinsulating pectin–silica hybrid aerogels is presented. Their structural and physical properties can be tuned by adjusting the gelation pH and pectin concentration. Hybrid aerogels made at pH 1.5 exhibit minimal dust release and vastly improved mechanical properties while remaining excellent thermal insulators. The change in the mechanical properties is directly linked to the observed “neck-free” nanoscale network structure with thicker struts. Such a design is superior to “neck-limited”, classical inorganic aerogels. This new class of materials opens up new perspectives for novel silica–biopolymer nanocomposite aerogels

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confidence: 99%

Strong, Thermally Superinsulating Biopolymer–Silica Aerogel Hybrids by Cogelation of Silicic Acid with Pectin

et al. 2015

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“…In comparison with monolithic aerogels they exhibit much more durability and stability. In literature there are many mathematical models and experimental research results confirming the outstanding thermal performance of aerogel blankets [4,5,[10][11][12][13][14].…”

Section: Fields Of Applicationsmentioning

confidence: 92%

“…( − ) (4) where: N -reference calorimeter heat transfer coefficient, W/m 2 K, TL -bottom heater temperature, K.…”

Section: Unitherm Tm 2022 Thermal Conductivity Instrumentmentioning

confidence: 99%

“…Aerogels are a diverse class of porous, solid materials that exhibit an uncanny array of extreme materials properties [1]. Most notably aerogels are known for their extreme low densities (from 1 to 500 kg/m 3 ) [2,3] that result from high porosity and low coefficient of thermal conductivity (up to 0.013 W/mK) [1, [3][4][5]. The most popular are silica aerogels, which are an amorphous solid materials derived from silica based gel.…”

Section: Introductionmentioning

confidence: 99%

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Properties, applications and thermal investigation of aerogels

Tychanicz

Smusz

2017

ZN PRz Mechanika

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Among the variety of products for thermal insulation in industry the aerogel blankets have received significant attention because of their unique properties and wide range of applications. This paper presents the basic properties, fields of application and results of experimental study of Pyrogel XT, which is a type of high temperature aerogel blanket. It is formed of silica aerogel and reinforced with glass fiber batting. In comparison with traditional insulating materials Pyrogel XT is much more efficient thermal insulation with wide temperature range of application (-40÷650ºC). It also has the lowest thermal conductivity of any known solid material. Experimental investigation of thermophysical properties of Pyrogel XT was carried out by using traditional and modern research methods. The traditional method utilized a simplified single-plate Poensgen apparatus. The modern approach was performed on a Unitherm TM model 2022 thermal conductivity instrument which uses a guarded heat flow meter method according to ASTM E1530 standard. Results obtained from both devices were compared and analyzed.

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“…Composite materials have many favorable properties, including high strength to-weight ratios and high corrosion resistances. The properties of these materials and the problems of obtaining structural elements based upon them have been studied by researchers and engineers all over the world [1]. Any property of a composite which is made of two (or more) materials has the value which is the resultant of a few factors.…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer in Enclosure of Composite Material with Fibers Arranged in Various Geometrical Arrays

Dhaef¹

2015

IJCA

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This paper presents a numerical investigation for natural convection of air in a three dimensional inclined annulus enclosure. This study wills exam the effect of radius ratio of an annulus made from graphite/epoxy laminated composite material on heat transfer taking two types of optimization of effective thermal conductivity in consideration: minimization and maximization of thermal conductivity. The annulus enclosure is filled with porous media between two concentric cylinders with 12 fins attached to the inner cylinder. Two cases are taken for the inclination angle of the annulus: horizontal and vertical annulus. The system is under steady state condition and constant walls temperature boundary condition. The parameters affected on the system are modified Rayleigh number (10 ≤Ra * ≤ 500), the annulus inclination angle δ (0 o and 90 o ) and the radius ratio Rr= (RI/RO)=0.2, 0.3, 0.4 and 0.5.For all parameters, results showed that Nusselt number decrease with the decrease of the radius ratio Rr (which means larger gap) for the outer cold cylinder. the average Nu number increases with an increase in modified Rayleigh number and decrease with the increase of δ for high values of Ra * , but hardly affected by δ for low values of Ra * . The deviation between the average Nu for the maximization and minimization of the thermal conductivity is equal to 5.1% for horizontal annulus δ=0 o and 10% for vertical annulus δ=90 o . Local Nu increases with the length of the cylinder and the effect of the fins attached to the inner cylinder is more significant for the horizontal cylinder because of its hindering effect. A correlation for the average Nusselt number in terms of Ra * and δ, has been developed for the outer cold cylinder.

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Heat insulation properties of silica aerogel/glass fiber composites fabricated by press forming

Cited by 177 publications

References 8 publications

Strong, Thermally Superinsulating Biopolymer–Silica Aerogel Hybrids by Cogelation of Silicic Acid with Pectin

Strong, Thermally Superinsulating Biopolymer–Silica Aerogel Hybrids by Cogelation of Silicic Acid with Pectin

Properties, applications and thermal investigation of aerogels

Heat Transfer in Enclosure of Composite Material with Fibers Arranged in Various Geometrical Arrays

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