以正硅酸乙酯(TEOS),甲基三乙氧基硅烷(MTES)为硅源,硝酸为催化剂,制备了甲基修饰的二氧化硅膜,研究了MTES改性二氧化硅膜的表面润湿性与表面结构的关系以及MTES改性二氧化硅膜的吸水率.用已知表面张力的液体测定接触角,按扩展的Fowkes式计算试样的表面张力γs及其三组分值γsd(色散力)、γsp(偶极矩力)和γsb(氢键力),用热重分析(TG)法测定二氧化硅膜的吸水率.结果表明,随着MTES/TEOS摩尔比增大,二氧化硅膜的表面自由能显著减小,表面润湿性降低,主要是表面张力中氢键力组分的贡献.X射线光电子能谱分析表明,这是由于二氧化硅颗粒表面Si-CH3基团增加而Si-O和O-H基团减小所致.随着MTES/TEOS摩尔比增大,二氧化硅膜的吸水率降低,疏水性二氧化硅膜的MTES/TEOS摩尔比应大于0.8.
参考文献
| [1] | Hegde ND;Rao AV .Organic modification of TEOS based silica aerogels using hexadecyltrimethoxysilane as a hydrophobic reagent[J].Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials,2006(3):1566-1572. |
| [2] | PRAKASH S S;JEFFREY B C;HURD A J .Silica aerogel films at ambient pressure[J].Journal of NON-CRYSTALLINE SOLIDS,1995,190(03):264-275. |
| [3] | BAE J Y;JUNG J I;SEO S J et al.Formation sod thermal-induced changes of mesostructures in fluorinated organosilicate films[J].Sicroporous and Mesoporous Materials,2007,98(1-3):283-291. |
| [4] | A. Parvathy Rao;A. Venkateswara Rao;G.M. Pajonk .Hydrophobic and physical properties of the ambient pressure dried silica aerogels with sodium silicate precursor using various surface modification agents[J].Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials,2007(14):6032-6040. |
| [5] | IWAMOTO Y;SATO K;KATO T et al.A hydrogen-permselective amorphous silica membrane derived from polysilazane[J].Journal of the European Ceramic Society,2005,25(2-3):257-264. |
| [6] | Nomura M;Ono K;Gopalakrishnan S;Sugawara T;Nakao SI .Preparation of a stable silica membrane by a counter diffusion chemical vapor deposition method[J].Journal of Membrane Science,2005(1/2):151-158. |
| [7] | V.Rouessac;P.Ferreira;J.Durand .Preparation of silica membranes inside macroporous alumina tubes by PECVD for hydrogen selectivity[J].Separation and Purification Technology,2003(1/3):37-43. |
| [8] | Suraj Gopalakrishnan;Yasushi Yoshino;Mikihiro Nomura;Balagopal N. Nair;Shin-Ichi Nakao .A hybrid processing method for high performance hydrogen-selective silica membranes[J].Journal of Membrane Science,2007(1/2):5-9. |
| [9] | Elferink WJ.;Devos RM.;Keizer K.;Verweij H.;Nair BN. .SOL-GEL SYNTHESIS AND CHARACTERIZATION OF MICROPOROUS SILICA MEMBRANES .2. TAILOR-MAKING POROSITY[J].Journal of Colloid and Interface Science,1996(1):127-134. |
| [10] | de Vos Renate M.;Verweij Henk;Maier Wilhelm F. .Hydrophobic silica membranes for gas separation[J].Journal of Membrane Science,1999(1):277-288. |
| [11] | Standeker S;Novak Z;Knez Z .Adsorption of toxic organic compounds from water with hydrophobic silica aerogels[J].Journal of Colloid and Interface Science,2007(2):362-368. |
| [12] | CASTRICUM H L;MARJO C M H;ASHIMA SAH et al.Increasing the hydrothermal stability of mesoporous SiO2 with methylehlorosilanes-a'structural'study[J].Microporous and Mesoporous Materials,2006,88(1-3):63-71. |
| [13] | A. Venkateswara Rao;D. Haranath .Effect of methyltrimethoxysilane as a synthesis component on the hydrophobicity and some physical properties of silica aerogels[J].Microporous and Mesoporous Materials,1999(2/3):267-273. |
| [14] | A. Venkateswara Rao;Nagaraja D. Hegde;Poonam M. Shewale .Imperviousness of the hydrophobic silica aerogels against various solvents and acids[J].Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials,2007(9):4137-4141. |
| [15] | Churaev NV;Sobolev VD .Wetting of low-energy surfaces[J].Advances in colloid and interface science,2007(0):15-23. |
| [16] | VOLPE C D;DIRE S;PAGANI E .A comparative analysis of surface structure and surface tension of hybrid silica film[J].Journal of Non-Crystalline Solids,1997,209(1-2):51-60. |
| [17] | 陈杰瑢.低温等离子体处理聚酯（PET）表面润湿性与表面结构的研究[J].高等学校化学学报,1997(03):466. |
| [18] | CHEN J;WAKIDA T .Studies on the surface free energy and surface structure of PETF film treated with low temperature plasma[J].Journal of Applied Polymer Science,1997,63(01):1733-1739. |
| [19] | Zhang HL;Simpson D;Kumar S;Smart RSC .Interaction of hydroxylated PACVD silica coatings on titanium with simulated body fluid[J].Colloids and Surfaces, A. Physicochemical and Engineering Aspects,2006(1/3):128-138. |
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