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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >New approach for measuring gelation rate during synthesis of ZnO/SiO2 gel
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New approach for measuring gelation rate during synthesis of ZnO/SiO2 gel

机译：ZnO / SiO2凝胶合成过程中测量胶凝速率的新方法

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The synthesis of mixed ZnO/SiO2 oxides has been carried out using sot gel technique. Gelation time of the produced oxides gel has been measured experimentally by using turbidity change with time using Turbidimeter. In addition, gelation time was estimated visually. it is found that the gelation time is decreased by increasing the concentration of ZnO and SiO2 Correlations between gelation times and concentrations of products are also discussed. Surface energy between the formed gel and solution is calculated as 12.1 mJ/m(2). The gelation rate is increased and the Gibbs free energy for the formation of critical nucleus is decreased by increasing the concentration product of ZnO (.) SiO2. The critical radius of the nucleus is decreased from 5.75 to 5.02 angstrom when the concentration product is increased from 6.42% to 15.72%. On the other hand, the number of molecules in the critical nucleus is decreased from I I to 8 when the concentration product changed under the same conditions. This approach can be used as a model to discuss the effect of any additives on the enhancing or inhibition the gelation rate for any gel. (c) 2006 Elsevier B.V. All rights reserved.
机译：ZnO / SiO2混合氧化物的合成已经采用油凝胶技术进行了。通过使用浊度计随时间的浊度变化，通过实验测量了所产生的氧化物凝胶的胶凝时间。另外，肉眼估计胶凝时间。发现通过增加ZnO和SiO 2的浓度减少了胶凝时间。还讨论了胶凝时间与产物浓度之间的相关性。形成的凝胶和溶液之间的表面能经计算为12.1 mJ / m（2）。通过增加ZnO（。）SiO2的浓度积，可以增加凝胶化速率，并减少形成关键核的吉布斯自由能。当浓度乘积从6.42％增加到15.72％时，原子核的临界半径从5.75埃减少到5.02埃。另一方面，当浓度乘积在相同条件下变化时，关键核中的分子数从I I减少到8。该方法可以用作讨论任何添加剂对提高或抑制任何凝胶的胶凝速率的作用的模型。 （c）2006 Elsevier B.V.保留所有权利。

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