Studies On The Preparing Of Nanoporous Material And Mechanical Issues Associated

The nanoporous network structure of silicon dioxide nanoporous material which composed of colloid particles conglomerating together is a kind of highly dispersed non-crystalline solids. It has numerous particular properties for its unique structure of high porous, high area ratio and nano magnitude in porous' dimensions. In the synthesis of the material, however, it always exists the problems of rigorous reacting conditions and easily cracking, which confine the preparation and application of the material. Therefore, after mechanical analyzing of the material, we designed and adopted new method at normal temperature and pressure conditions of preparing the materials, differential drying method, to get intact specimens.This paper mainly consists of two parts: 3. Mechanical analysis and designing of drying processThe drying process has been described and analyzed preliminarily in three periods. During the first period, the dynamical effects produced by unloading waves has been studied; During the medium period, it has been analyzed that the effects on stress field of gels are originated from the uneven distribution of porous, which has been proved and resolved by some chemical methods; Finally, during the last period, the materials with cracks have been studied for the effects of porous ratio and sorption on the crack developing. Under the guidance of mechanical analysis, new drying methods, differential drying method, which is useful incontrolling the reacting condition is designed.4. Preparation of SiO2 nanoporous materialadulterated with Ni and inorganic-biomaterial hybridSiO2 nanoporous material adulterated with Ni has been synthesized successfully from tetraethoxysilicane as silicon resources, ethanol as solvent and watery HC1 or ammonia by sol-gel method; It is also dealt with in the electric field with Ni redistributed vertically; Organic-biomaterial hybrid has been prepared by choosing suitable solvent and catalyst ; Promising properties have been obtained after a series of experiments.