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电解质溶液知识历来是广东高考化学的教学重点,也是高考的重点。其涉及的主要考点有:电解质溶液导电性的比较;强电解质和弱电解质的概念,水的电离和弱电解质的电离平衡;pH的概念及计算;盐类水解的原理;离子浓度大小的比较等。对于这些经久不衰的常考点,我们要格外重视,掌握其解题要领。 相似文献
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采用钛酸丁酯和全氟磺酸树脂(PSR),通过溶胶-凝胶过程形成均匀稳定的复合溶胶并成功制得复合薄膜,通过FTIR分析薄膜中二氧化钛与PSR的相互作用,利用SEM观察薄膜的表面形貌。对制得的复合膜光催化降解性能进行考察,发现复合薄膜表现出良好的光催化活性,优于纯二氧化钛的光催化活性和PSR吸附性能的叠加。 相似文献
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Simin ZHOU 《等离子体科学和技术》2019,21(6):65401-114
A surface dielectric barrier discharge (SDBD) can discharge at atmospheric pressure and produce a large area of low-temperature plasma. An SDBD plasma reactor based on the double spiral structure is introduced in this paper. To study the discharge mechanism of SDBD, an equivalent circuit model was proposed based on the analysis of the micro-discharge process of SDBD. Matlab/Simulink is used to simulate and compare the voltage–current waves, Lissajous and discharge power with the experimental results. The consistency of the results verifies the validity of the SDBD equivalent circuit model. Maxwell software based on the finite elements method is used to analyze the electrostatic field distribution of the device, which can better explain the relationship between the discharge image and the electrostatic field distribution. The combination of equivalent circuit simulation and electrostatic field simulation can provide better guidance for optimizing a plasma generator. Finally, the device is used to treat PM2.5 and formaldehyde. The test results show that the degradation rate of PM2.5 can reach 78% after 24 min, and formaldehyde is about 31.5% after 10 min of plasma treatment. 相似文献
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以甲基三甲氧基硅烷(MTMS)为前驱体,通过溶胶-凝胶反应和常压干燥法实现了二氧化硅(SiO_2)气凝胶的制备;并将SiO_2气凝胶与聚二甲基硅氧烷(PDMS)混合应用到棉织物上,制备了超疏水功能棉织物。分别探讨了制备SiO_2气凝胶和超疏水棉织物的主要影响因素。结果表明,在草酸与MTMS摩尔配合比为1.6×10-4∶1,凝胶化温度为40℃,老化温度为40℃条件下,制备的SiO_2气凝胶具有连续多孔微观粗糙结构,密度为106.4kg/m3,孔隙率达到95.16%。在SiO_2气凝胶用量为4%(wt,质量分数),PDMS用量为4%(wt,质量分数)条件下,整理后棉织物的接触角为156.4°,实现了超疏水性能。 相似文献
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