Silica aerogel; synthesis, properties and characterization

Abstract In recent years, silica aerogels have attracted increasingly more attention due to their extraordinary properties and their existing and potential applications in wide variety technological areas. Silica aerogel is a nanostructured material with high specific surface area, high porosity, low density, low dielectric constant and excellent heat insulation properties. Many research works have been carried out concerning aerogel production and characterization. In this review paper, research work and developments in synthesis, properties and characterization of silica aerogels will be addressed. Particular attention is paid to drying which is a critical step in aerogel synthesis and makes the production of this material more economical and commercial.

[1]  J. Pirard,et al.  Preparation of low-density xerogels through additives to TEOS-based alcogels , 1999 .

[2]  K. Nakanishi,et al.  Effect of skeleton size on the performance of octadecylsilylated continuous porous silica columns in reversed-phase liquid chromatography , 1997 .

[3]  A. V. Rao,et al.  Influence of gel aging and Na2SiO3/H2O molar ratio on monolithicity and physical properties of water–glass-based aerogels dried at atmospheric pressure , 2004 .

[4]  S. Hyun,et al.  Effect of mixing on thermal and mechanical properties of aerogel-PVB composites , 2003 .

[5]  D. Haranath,et al.  Effect of methyltrimethoxysilane as a synthesis component on the hydrophobicity and some physical properties of silica aerogels , 1999 .

[6]  E. Quitevis,et al.  Microstructure and Porosity of Silica Xerogel Monoliths Prepared by the Fast Sol-Gel Method , 2000 .

[7]  R. Oréfice,et al.  Sol-gel silica based networks with controlled chemical properties , 2000 .

[8]  Douglas M. Smith,et al.  Preparation of low-density xerogels at ambient pressure , 1995 .

[9]  M. Reetz,et al.  Efficient immobilization of lipases by entrapment in hydrophobic sol‐gel materials , 2000, Biotechnology and bioengineering.

[10]  Y. Ahn,et al.  Rapid synthesis of water-glass based aerogels by in situ surface modification of the hydrogels , 2007 .

[11]  K. Igarashi,et al.  The effect of the preparation conditions on the optical properties of transparent silica aerogels , 1998 .

[12]  C. Brinker,et al.  Pore structure evolution in silica gel during aging/drying. III. Effects of surface tension* , 1992 .

[13]  Finn Harken Kristiansen,et al.  Super insulating aerogel glazing , 2005 .

[14]  M. Einarsrud,et al.  Structural development of silica gels aged in TEOS , 1998 .

[15]  J. Garrido,et al.  Effects of aging and drying conditions on the structural and textural properties of silica gels , 2007 .

[16]  R. Riethmüller,et al.  Preparation of silica aerogel for Cherenkov counters , 1982 .

[17]  P. Norris,et al.  Mechanical and acoustical properties as a function of PEG concentration in macroporous silica gels , 2001 .

[18]  Soga,et al.  Performance of a monolithic silica column in a capillary under pressure-driven and electrodriven conditions , 2000, Analytical chemistry.

[19]  G. Stucky,et al.  Manipulation of pore size distributions in silica and ormosil gels dried under ambient pressure conditions , 2002 .

[20]  J. Geus,et al.  Fluid composition effects on silica gel aging , 1994 .

[21]  B. Cao,et al.  Sol-gel derived self-supporting film , 1999 .

[22]  X. Zhang,et al.  Single step on-column frit making for capillary high-performance liquid chromatography using sol-gel technology. , 2001, Journal of chromatography. A.

[23]  C. Brinker,et al.  Pore structure evolution in silica gel during aging/drying I. Temporal and thermal aging , 1992 .

[24]  A. Pierre,et al.  Hydrophobic silica aerogel-lipase biocatalysts Possible interactions between the enzyme and the gel , 2004 .

[25]  A. B. Haan,et al.  Drying of silica aerogel with supercritical carbon dioxide , 1995 .

[26]  Finn Harken Kristiansen,et al.  Development of windows based on highly insulating aerogel glazings , 2004 .

[27]  O. Glatter,et al.  19 – Small-Angle X-ray Scattering , 1973 .

[28]  K. Nakamoto,et al.  The handbook of infrared and Raman spectra of inorganic compounds and organic salts , 1997 .

[29]  M. Basta,et al.  An introduction to percolation , 1994 .

[30]  S. Hyun,et al.  Effective preparation of crack-free silica aerogels via ambient drying , 2007 .

[31]  I. Adachi,et al.  Study of a Threshold Cherenkov Counter Based on Silica Aerogels with Low Refractive Indices , 1994 .

[32]  S. Kistler.  Coherent Expanded-Aerogels , 1931 .

[33]  R. Pekala,et al.  A rapid supercritical extraction process for the production of silica aerogels , 1996 .

[34]  J. Phalippou,et al.  Transformation of nanostructure of silica gels during drying , 2000 .

[35]  U. Schubert,et al.  Aerogels-Airy Materials: Chemistry, Structure, and Properties. , 1998, Angewandte Chemie.

[36]  S. Komarneni,et al.  Nanocomposite aerogels: The SiO_2–Al_2O_3 system , 1993 .

[37]  A. Buzykaev,et al.  Measurement of optical parameters of aerogel , 1999 .

[38]  Y. Ahn,et al.  Textural properties of ambient pressure dried water-glass based silica aerogel beads: One day synthesis , 2006 .

[39]  H. Hirashima,et al.  Absorption and desorption of organic liquids in elastic superhydrophobic silica aerogels. , 2007, Journal of colloid and interface science.

[40]  A. Okunev,et al.  SYNTHESIS OF AEROGEL TILES WITH HIGH LIGHT SCATTERING LENGTH , 1999 .

[41]  Mary K. Carroll,et al.  A fast supercritical extraction technique for aerogel fabrication , 2004 .

[42]  G. Pajonk,et al.  Relations between the texture of silica aerogels and their preparation , 1995 .

[43]  A. V. Rao,et al.  Comparative studies on the surface chemical modification of silica aerogels based on various organosilane compounds of the type RnSiX4−n , 2004 .

[44]  J. Mackenzie.  Applications of the sol-gel process , 1988 .

[45]  G. Scherer,et al.  Nitrogen sorption in aerogels , 2001 .

[46]  G. Beaucage,et al.  Structural analysis of silica aerogels , 1995 .

[47]  S. Fratina,et al.  Study of highly transparent silica aerogel as a RICH radiator , 2005 .

[48]  M. Einarsrud,et al.  Shrinkage of silica gels aged in TEOS , 1996 .

[49]  G. Reichenauer.  Thermal aging of silica gels in water , 2004 .

[50]  S. Hyun,et al.  Synthesis of silica aerogels from waterglass via new modified ambient drying , 2002 .

[51]  P. B. Wagh,et al.  Comparison of some physico-chemical properties of hydrophilic and hydrophobic silica aerogels , 2002 .

[52]  M. Einarsrud,et al.  Subcritical drying of silica gels , 1996 .

[53]  D. Lecomte,et al.  Study of evaporative drying of treated silica gels , 2004 .

[54]  J. Fricke.  Aerogels — highly tenuous solids with fascinating properties , 1988 .

[55]  Jun Shen,et al.  Properties of sol–gel derived scratch-resistant nano-porous silica films by a mixed atmosphere treatment , 2000 .

[56]  A. Baiker,et al.  Aerogels in catalysis , 1995 .

[57]  Mark T. Anderson,et al.  Surfactant-templated silica aerogels , 1998 .

[58]  A. V. Rao,et al.  Influence of temperature on the physical properties of TEOS silica xerogels , 1999 .

[59]  A. V. Rao,et al.  Superhydrophobic silica aerogels based on methyltrimethoxysilane precursor , 2003 .

[60]  S. Hyun,et al.  Synthesis and characterization of silica aerogel films for inter-metal dielectrics via ambient drying , 2004 .

[61]  A. Pierre,et al.  NMR and IR spectroscopy of silica aerogels with different hydrophobic characteristics , 2005 .

[62]  George W. Scherer,et al.  Effect of aging and pH on the modulus of aerogels , 1990 .

[63]  M. Einarsrud,et al.  Strengthening of water glass and colloidal sol based silica gels by aging in TEOS , 1998 .

[64]  D. Cooper.  THEORETICAL STUDY OF A NEW MATERIAL FOR FILTERS: AEROGELS , 1989 .

[65]  M. Einarsrud,et al.  Preparation and properties of monolithic silica xerogels from TEOS-based alcogels aged in silane solutions , 1995 .

[66]  Tao Wang,et al.  Preparation of silica aerogel from rice hull ash by supercritical carbon dioxide drying , 2005 .

[67]  A. V. Rao,et al.  Hydrophobic and Physical Properties of the Two Step Processed Ambient Pressure Dried Silica Aerogels with Various Exchanging Solvents , 2005 .

[68]  K. Lynn,et al.  Interaction of positron beams with surfaces, thin films, and interfaces , 1988 .

[69]  M. Einarsrud,et al.  Properties of silica gels aged in TEOS , 1996 .

[70]  A. Hunt,et al.  Comparison of ethyl versus methyl sol-gels for silica aerogels using polar nephelometry☆ , 1986 .

[71]  J. Mackenzie,et al.  Sol-gel processing of silica. II: The role of the catalyst , 1986 .

[72]  A. A. Anappara,et al.  Impedance spectroscopic studies of sol-gel derived subcritically dried silica aerogels , 2004 .

[73]  K. Nakanishi,et al.  Double pore silica gel monolith applied to liquid chromatography , 1997 .

[74]  Jun Shen,et al.  Physical Properties of Silica Aerogels Prepared with Polyethoxydisiloxanes , 2000 .

[75]  M. Ishino,et al.  Mass production of hydrophobic silica aerogel and readout optics of Cherenkov light , 2001 .

[76]  G. Scherer,et al.  Cavitation during drying of a gel , 1995 .

[77]  J. Anderson,et al.  Thermal and temporal aging of TMOS-based aerogel precursors in water , 1995 .

[78]  D. Ganguli,et al.  Dense silica microspheres from organic and inorganic acid hydrolysis of TEOS , 2000 .

[79]  Y. Attia.  Sol-gel processing and applications , 1994 .

[80]  R. Freitag,et al.  Preparation of stationary phases for open-tubular capillary electrochromatography using the sol-gel method. , 2000, Journal of chromatography. A.

[81]  G. Scherer,et al.  Compression of aerogels , 1995 .

[82]  M. Einarsrud,et al.  Strengthening and aging of wet silica gels for up-scaling of aerogel preparation , 2007 .

[83]  M. Einarsrud,et al.  Effect of precursors, methylation agents and solvents on the physicochemical properties of silica aerogels prepared by atmospheric pressure drying method , 2001 .

[84]  P. Wawrzyniak,et al.  Effective diffusion coefficient in the low temperature process of silica aerogel production , 2001 .

[85]  T. Woignier,et al.  Skeletal density of silica aerogels , 1987 .

[86]  S. N. Timasheff,et al.  Small-angle x-ray scattering. , 1973, Methods in enzymology.

[87]  S. Chaudhuri,et al.  Drying of aerogels in different solvents between atmospheric and supercritical pressures , 1998 .

[88]  Durand,et al.  Transition between flocculation and percolation of a diffusion-limited cluster-cluster aggregation process using three-dimensional Monte Carlo simulation. , 1995, Physical review. B, Condensed matter.

[89]  Gerard Pajonk,et al.  Transparent silica aerogels , 1998 .

[90]  A. V. Rao,et al.  Hydrophobic properties of TMOS/TMES-based silica aerogels , 2002 .

[91]  S. Bhagat,et al.  Synthesis and physical properties of TEOS-based silica aerogels prepared by two step (acid–base) sol–gel process , 2004 .

[92]  M. Moner-Girona,et al.  Sol-Gel Route to Direct Formation of Silica Aerogel Microparticles Using Supercritical Solvents , 2003 .

[93]  John F. Watts,et al.  Encyclopedia of materials characterization: C. Richard Brundle, Charles A. Evans Jr and Shaun Wilson (Eds) Butterworth-Heinemann, Stoneham, USA, 1992, ISBN 0-7506-9168-9, 750pp. £75 , 1993 .

[94]  I. Adachi,et al.  Silica aerogels in high energy physics , 1998 .

[95]  V. Fadeyev,et al.  Experimental study of aerogel Cherenkov detectors for particle identification , 1996 .

[96]  J. Pirard,et al.  The use of additives to prepare low-density xerogels , 2001 .

[97]  D. Teeters,et al.  Processing of low-density silica gel by critical point drying or ambient pressure drying , 2001 .

[98]  A. Sarkar,et al.  Drying and sintering of sol-gel derived large SiO2 monoliths , 1996 .

[99]  A. Pierre,et al.  Chemistry of aerogels and their applications. , 2002, Chemical reviews.

[100]  K. Nakanishi,et al.  Octadecylsilylated porous silica rods as separation media for reversed-phase liquid chromatography. , 1996, Analytical chemistry.

[101]  J. Fricke,et al.  Aerogels: production, characterization, and applications , 1997 .

[102]  Jingxiao Liu,et al.  Synthesis and characterization of silica aerogels by a novel fast ambient pressure drying process , 2006 .

[103]  H. Hirashima,et al.  Synthesis of flexible silica aerogels using methyltrimethoxysilane (MTMS) precursor. , 2006, Journal of colloid and interface science.

[104]  F. Schwertfeger,et al.  Applications for silica aerogel products , 1998 .

[105]  C. Brinker,et al.  Pore structure evolution in silica gel during aging/drying II. Effect of pore fluids , 1992 .

[106]  J. Pirard,et al.  The role of the main silica precursor and the additive in the preparation, of low-density xerogels , 2002 .

[107]  D. Ulrich.  Prospects for sol-gel processes , 1990 .

[108]  Helmut Schmidt,et al.  Investigation of Ion-Conducting Ormolytes: Structure-Property Relationships , 1994 .

[109]  B. Lee,et al.  Solvent effect on ageing of silica gels , 1994, Journal of Materials Science.

[110]  D. Suh,et al.  Effect of aging on the porous texture of silica aerogels prepared by NH4OH and NH4F catalyzed sol-gel process , 1999 .

[111]  F. Despetis,et al.  Ultralow density silica aerogels by alcohol supercritical drying , 1998 .

[112]  Marc Schmidt,et al.  Hydrophobic waterglass based aerogels without solvent exchange or supercritical drying , 1998 .

[113]  J. Pirard,et al.  Preparation of low-density xerogels by incorporation of additives during synthesis , 2001 .

[114]  L. Colón,et al.  Investigations of a sol-gel derived stationary phase for open tubular capillary electrochromatography , 1999 .

[115]  Stress formation during heating in supercritical drying , 2001 .

[116]  K. Warrier,et al.  Effect of aging time and concentration of aging solution on the porosity characteristics of subcritically dried silica aerogels , 2006 .

[117]  S. Yoda,et al.  Supercritical drying media modification for silica aerogel preparation , 1999 .

[118]  A. Hunt.  Light scattering for aerogel characterization , 1998 .

[119]  Porosity characterization of aerogels using positron annihilation lifetime spectroscopy , 2004 .

[120]  A. V. Rao,et al.  Small-angle X-ray scattering of a new series of organic aerogels , 2001 .

[121]  D. Vollet,et al.  A SAXS study of kinetics of aggregation of TEOS-derived sonogels at different temperatures , 2001 .

[122]  K. Nakanishi,et al.  Structure Design of Double-Pore Silica and Its Application to HPLC , 1998 .

[123]  A. Hunt,et al.  Advances in Production of Transparent Silica Aerogels for Window Glazings , 1986 .

[124]  K. Nakanishi,et al.  Designing monolithic double-pore silica for high-speed liquid chromatography , 1998 .

[125]  B. D. Kay,et al.  Sol-gel transition in simple silicates II☆ , 1982 .

[126]  G. Pajonk,et al.  Effect of preparation conditions on the physical and hydrophobic properties of two step processed ambient pressure dried silica aerogels , 2005 .

[127]  J. Gross,et al.  Optimization of the rapid supercritical extraction process for aerogels , 2002 .

[128]  K. Sing.  Reporting physisorption data for gas/solid systems with special reference to the determination of surface area and porosity (Recommendations 1984) , 1985 .

[129]  P. Berdahl,et al.  Structure Data from Light Scattering Studies of Aerogel , 1984 .

[130]  S. Redner,et al.  Introduction To Percolation Theory , 2018 .

[131]  Y. Fujise,et al.  Fritless packed columns for capillary electrochromatography:  separation of uncharged compounds on hydrophobic hydrogels. , 1996, Analytical chemistry.

[132]  M. Einarsrud.  Light gels by conventional drying , 1998 .

[133]  M. Iodice,et al.  Electronic detection of focused Cherenkov rings from aerogel , 1997 .

[134]  S. Pennycook,et al.  Preparation of silica aerogel using ionic liquids as solvents , 2000 .

[135]  G. Beaucage,et al.  Structural analysis of poly(dimethylsiloxane) modified silica xerogels , 1999 .

[136]  M. Einarsrud,et al.  Strengthening of silica gels and aerogels by washing and aging processes , 2001 .

[137]  H. Gesser,et al.  Aerogels and related porous materials , 1989 .

[138]  H. Yokogawa,et al.  Hydrophobic silica aerogels , 1995 .

[139]  Risto M. Nieminen,et al.  Theory of Positrons in Solids and on Solid Surfaces , 1994 .

[140]  J. Phalippou,et al.  Sol–gel derived porous silica films , 1999 .

[141]  Arlon J. Hunt,et al.  Ambient-temperature supercritical drying of transparent silica aerogels☆ , 1985 .

[142]  A. V. Rao,et al.  Hydrophobic and physical properties of the ambient pressure dried silica aerogels with sodium silicate precursor using various surface modification agents , 2007 .

[143]  A. V. Rao,et al.  Comparison of some physical properties of silica aerogel monoliths synthesized by different precursors , 1999 .

[144]  M. Kulkarni,et al.  Effect of glycerol additive on physical properties of hydrophobic silica aerogels , 2003 .

[145]  Jun Shen,et al.  Hydrophobic silica aerogels derived from polyethoxydisiloxane and perfluoroalkylsilane , 2007 .