Low-cost and fast synthesis of nanoporous silica cryogels for thermal insulation applications

Su, Li; Liu, Miao; Tanaka, Sakae; Xu, Gang

doi:10.1088/1468-6996/13/3/035003

Cited by 32 publications

(20 citation statements)

References 39 publications

(42 reference statements)

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“…TBA was selected as it has a melt point of 25°C, has been used to form silica cryogels [59], is relatively facile to lyophilise, and forms azeotropes with water and ethanol. TEOS, TBA and 1 M HCl were added in that order to give a molar ratio of 1:5:2.7:0.05 (TEOS:TBA:H 2 O:HCl), typical volumes shown in Table S1.…”

Section: Precursor Preparation Fibre Spinningmentioning

confidence: 99%

Section: Class I and Ii Hybrid Solution Rheological Propertiesmentioning

confidence: 99%

“…Highly porous silica nanoparticles have previously been prepared using TBA and a basic catalyst [59]. Su et al [59] previously obtained high surface area cryogels using a molar ratio of 13 (TBA:TEOS). In the current work, a molar ratio of 5 (TBA:TEOS) was used as higher concentrations of TBA lead to the precipitation of gelatin [63].…”

Section: Class I and Ii Hybrid Solution Rheological Propertiesmentioning

confidence: 99%

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Hybrid sol–gel inorganic/gelatin porous fibres via solution blow spinning

et al. 2017

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Hybrid sol-gel inorganic-organic fibres offer great potential in tissue engineering and regenerative medicine. A significant challenge is to process them using scalable technologies into useful scaffolds that provide control over fibre diameter, morphology, mechanical properties, ion release, degradation and cell response. In this work we develop formulations that are amenable to processing via solution blow spinning (SBS), a rapid technique using simple equipment to spray nano-/ micro-fibres without any electric fields. The technique is extended to produce porous class I and II hybrid fibres using cryogenic SBS, with formulations developed based on tetraethyl orthosilicate/gelatin that are relatively facile to lyophilise. The formulations developed here take advantage of the reversible thermally activated conformation change of gelatin in aqueous solutions from random coil to triple helix to enable viscosity tuning and therefore fibre spinning. Gelatin is functionalised with (3-glycidyloxypropyl)trimethoxysilane to produce class II hybrids which exhibit controllable time-and temperature-dependent viscosity profiles which can be tuned for spinning into highly porous fibres.Ryan D. Greenhalgh and William S. Ambler are joint first authors due to equal contribution.

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Section: Precursor Preparation Fibre Spinningmentioning

confidence: 99%

Section: Class I and Ii Hybrid Solution Rheological Propertiesmentioning

confidence: 99%

Section: Class I and Ii Hybrid Solution Rheological Propertiesmentioning

confidence: 99%

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Hybrid sol–gel inorganic/gelatin porous fibres via solution blow spinning

et al. 2017

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“…The thermal conductivity coefficient for this layer is in the range from 0.001 to 0.0025 W/(m·K). In the case of the insulating layer in FPC, that is the air between the absorber and the glass panel, it amounts to 0.026 W/(m·K) [20] The second difference is the access to solar radiation, affected by the shape of the absorber [19] and favorable for ETCHP (Fig. 5).…”

Section: Collectorsmentioning

confidence: 99%

The sizes of Flat Plate and Evacuated Tube Collectors with Heat Pipe area as a function of the share of solar system in the heat demand

2016

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Abstract. The popularity of solar collectors in Poland is still increasing. The correct location of the collectors and a relatively high density of solar radiation allow delivering heat even in spite of relatively low ambient temperature. Moreover, solar systems used for heating domestic heat water (DHW) in summer allow nearly complete elimination of conventional energy sources (e.g. gas, coal). That is why more and more house owners in Poland decide to install solar system installations. In Poland the most common types of solar collectors are flat plate collectors (FPC) and evacuated tube collectors with heat pipe (ETCHP); both were selected for the analysis. The heat demand related to the preparation of hot water, connected with the size of solar collectors' area, has been determined. The analysis includes FPC and ETCHP and heat demand of less than 10 000 kWh/year. Simulations were performed with the Matlab software and using data from a typical meteorological year (TMY). In addition, a 126-year period of measurements of insolation for Krakow has been taken into account. The HDKR model (Hay, Davis, Klucher, Reindl) was used for the calculation of solar radiation on the absorber surface. The monthly medium temperature of the absorber depends on the amount of solar system heat and on the heat demand. All the previously mentioned data were used to determine solar efficiency. Due to the fact that solar efficiency and solar system heat are connected, the calculations were made with the use of an iterative method. Additionally, the upper limit for monthly useful solar system heat is resulted from the heat demand and thus the authors prepared a model of statistical solar system heat deviations based on the Monte Carlo method. It has been found that an increase in the useful solar system heat in reference to the heat demand is associated with more than proportional increase in the sizes of the analyzed surfaces of solar collector types.

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“…In most cases, the cryogel precursors are used to obtain various oxide nanoparticles, e.g., Co 3 O 4 [23], CeO 2 [64], V 2 O 5 [65], and ZrO 2 [66]. Cryogels of silica are widely used as sorbents or cryogenic thermal insulators thermal insulators [15,[67][68][69][70][71][72][73][74][75][76][77]. In this case, the most important morphological feature of silica gels protected during drying is their extended mesoporosity.…”

Section: Precipitated and Co-precipitated Cryogelsmentioning

confidence: 99%

Inorganic Cryogels

Shlyakhtin¹

2014

Polymeric Cryogels

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Low-cost and fast synthesis of nanoporous silica cryogels for thermal insulation applications

Cited by 32 publications

References 39 publications

Hybrid sol–gel inorganic/gelatin porous fibres via solution blow spinning

Hybrid sol–gel inorganic/gelatin porous fibres via solution blow spinning

The sizes of Flat Plate and Evacuated Tube Collectors with Heat Pipe area as a function of the share of solar system in the heat demand

Inorganic Cryogels

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