Smitha S, Shajesh P, Mukundan P, Nair T D R, Warrier K G K
Materials and Minerals Division, Regional Research Laboratory (CSIR), Trivandrum 695019, Kerala, India.
Colloids Surf B Biointerfaces. 2007 Mar 15;55(1):38-43. doi: 10.1016/j.colsurfb.2006.11.008. Epub 2006 Nov 17.
Silica-biopolymer hybrid has been synthesised using colloidal silica as the precursor for silica and gelatin as the biopolymer counterpart. The surface modification of the hybrid material has been done with methyltrimethoxysilane leading to the formation of biocompatible hydrophobic silica-gelatin hybrid. Here we are reporting hydrophobic silica-gelatin hybrid and coating precursor for the first time. The hybrid gel has been evaluated for chemical modification, thermal degradation, hydrophobicity, particle size, transparency under the UV-visible region and morphology. FTIR spectroscopy has been used to verify the presence of CH(3) groups which introduce hydrophobicity to the SiO2-MTMS-gelatin hybrids. The hydrophobic property has also been tailored by varying the concentration of methyltrimethoxysilane. Contact angle by Wilhelmy plate method of transparent hydrophobic silica-gelatin coatings has been found to be as high as approximately 95 degrees . Oxidation of the organic group which induces the hydrophobic character occurs at 530 degrees C which indicates that the surface hydrophobicity is retained up to that temperature. Optical transmittance of SiO2-MTMS-gelatin hybrid coatings on glass substrates has been found to be close to 100% which will enable the hybrid for possible optical applications and also for preparation of transparent biocompatible hydrophobic coatings on biological substrates such as leather.
已使用胶体二氧化硅作为二氧化硅的前体，并使用明胶作为生物聚合物对应物合成了二氧化硅-生物聚合物杂化物。杂化材料的表面改性是通过甲基三甲氧基硅烷进行的，从而形成了生物相容性疏水性二氧化硅-明胶杂化物。在此，我们首次报道了疏水性二氧化硅-明胶杂化物及其涂层前体。已对杂化凝胶进行了化学改性、热降解、疏水性、粒径、紫外-可见区域下的透明度和形态等方面的评估。傅里叶变换红外光谱已用于验证引入疏水性到SiO2-MTMS-明胶杂化物中的CH(3)基团的存在。疏水性也通过改变甲基三甲氧基硅烷的浓度进行了调整。通过威尔海姆平板法测得透明疏水性二氧化硅-明胶涂层的接触角高达约95度。诱导疏水性的有机基团的氧化发生在530摄氏度，这表明表面疏水性在该温度之前得以保留。已发现玻璃基板上的SiO2-MTMS-明胶杂化涂层的光学透过率接近100%，这将使该杂化物可用于可能的光学应用，也可用于在皮革等生物基材上制备透明生物相容性疏水涂层。
