Silica aerogel hydrophobic

Coleman, S.J. Coronado, P.R. Maxwell, R.S. Reynolds, J.G. Granulated activated carbon modified with hydrophobic silica aerogel— potential composite materials for the removal... 

Figure 5.5 Epoxide yields in peroxide epoxidation of cyclohexenol and cyclohexene catalyzed byTi-doped hydrophobic silica aerogels modified with different organic substances. (Reprinted from [89].)...

Zhou B, Shen J, Yuehua W, Wu G, Ni X (2007) Hydrophobic silica aerogels derived from polyethoxydisi-... 

Venkastewara Rao A, Kulkami MM (2(X)3) Effect of glycerol additive on physical properties of hydrophobic silica aerogels. Mater Chem Phys 77 819-825... 

Hiising N Schubert U, Misof K, Fratzi P (1998) Formation and Structure of Porous Gel Networks from Si(OMe)4 in the Presence of A(CH2)nSi(OR)3 (A = Functional Group). Chem Mater 10 3024-3032 Venkateswara Rao A, KuUcami MM, Pajonk GM, Amalnerkar DP, Seth T (2003) Synthesis and Characterization of Hydrophobic Silica Aerogels Using Trimethylethoxy silane as a Co-Precursor J Sol Gel Sci Technol 27 103-109... 

Yokogawa H, Yokoyama M (1995) Hydrophobic silica aerogels. J Non-Cryst Solids 186 23-29 Kharzheev YN (2008) Use of silica aerogels in Cherenkov counters. Physics of Particles and Nuclei,... 

Hydrophobic Silica Aerogels Review of Synthesis, Properties and Applications... 

In this chapter, we present a review of the s) thesis techniques for, properties of and applications of hydrophobic silica aerogels. In the following section, we review the techniques used to make silica aerogels. This is followed by sections devoted to the fabrication of hydrophobic aerogels, techniques for measuring hydrophobicity, a review of the literature on hydrophobic silica aerogels, and a summary of application areas for hydrophobic aerogels. 

Table 3.2. Co-Precursors (CP), silylating chemicals (S), and organic modifiers (OM) used in the production of hydrophobic silica aerogels...

There are three primary techniques used to make hydrophobic silica aerogels, all of which seek to replace the hydrophilic hydroxyl groups using surface modification. These involve either vapor phase after treatment, co-precursor techniques or derivatization methods. 

Figure 3.4. Schematic illustration of the methoxylation method of preparing hydrophobic silica aerogels. The precursor chemical, solvent, catalyst (and water) are mixed in solution and allowed to gel and age. The aged wet gel is then dried (typically through CSCE) and the resulting aerogel undergoes a methoxylation process in a reactor at high temperature to form a hydrophobic aerogel.

Figure 3.5. Schematic illustration of the co-precursor method of preparing hydrophobic silica aerogels. The hydrophobizing co-precursor is added to the liquid solution, the solution is allowed to gel and then the wet gel is dried by a CSCE, ASCE, or RSCE technique which results in a hydrophobic aerogel.

Table 3.3. Summary of hydrophobic silica aerogel literature... 

Anderson, A M, Carroll, M K, Green, E C, Melville, J M, Bono, M S (2010) Hydrophobic silica aerogels prepared via rapid supercritical extraction. J Sol-Gel Sci Tedmol 53(2) 199-207. 

Wagh, P B, Ingale, S V (2002) Comparison of some physico-chemical properties of hydrophilic and hydrophobic silica aerogels. Ceram Int 28(10) 43-50. 

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