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Thermodynamic stability, microvoid distribution and phases transformation of natural pozzolana opal shale(POS) were studied systematically in this work. XRD analysis showed that opal-CT, including microcrystal cristobalite and tridymite, is a major component of POS. DTA and FT-IR indicated that there were many hydroxyl groups and acid sites on the surface of amorphous SiO_2 materials. FE-SEM analysis exhibited amorphous SiO_2 particles(opal-A) covering over stacking sequences microcrystal cristobalite and tridymite. Meanwhile, MIP analysis demonstrated that porosity and pore size distribution of POS remained uniform below 600 ℃. Because stable porous microstructure is a key factor in improving photocatalyst activity, POS is suited to preparing highly active supported. 相似文献
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本文在综合调研基础上,详细分析了辽宁省建国以来粉煤灰资源特点,粉煤灰综合利用现状,并进一步论述了今后粉煤灰综合利用的发展方向及发展重点,进而提出了未来加强粉煤灰综合利用工作所应采取的对策措施。 相似文献
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大连理工大学土木水利实验教学中心以教育部"质量工程"中的国家级实验教学示范中心建设为契机,以校长欧进萍院士倡导的"实施精英教育培养精英人才"的理念为指导,以土木工程和水利工程国家级优势学科为支撑,积极推进实验教学改革,面向一年级本科生在土建类国家级实验教学示范中心中率先开设了"土木水利学科前沿实验"实验课程.本文对该课... 相似文献
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Diatomite was used as raw material to prepare sodium silicate with a modulus of 3.1 by alkalidissolution method and the resulted sodium silicate solution was employed as a precursor. Methyl methacrylate monomers were introduced in wet gels through solution-immersion, and upon heating at 70 ℃, the mesoporous surfaces throughout the skeletal framework were coated with the polymer layer. PMMA modified silica aerogels were successfully synthesized via ambient pressure drying. The properties were investigated by FTIR, NMR, TGA, nitrogen adsorption-desorption, FESEM and nano-indentation, etc. Results indicate that with the increasing of PMMA incorporated into silica aerogels, the bulk density and the BET surface area increase, the porosity decreases. Through the observation of FESEM, it is found that the interconnecting pores and the big pores add, the pore size distribution expands from 5-17 to 28-150 nm. By comparison, the PMMA modified silica aerogels achieve a 52-fold increase in hardness and a 10-fold increase in modulus. 相似文献
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碳纳米管由于其优异的性能,正迅速成为一种最有应用前景的纳米材料,对其改善水泥基复合材料的研究也成为纳米材料领域的热点。详细综述了碳纳米管通过纤维桥联、纤维拔出、网络填充改善水泥基复合材料性能的微观机理及研究进展,为其宏观性能提供了理论解释。 相似文献
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文章划分了反滤料的品种;按照反滤料的规格确定了应测试的性能指标;给出了性能指标的测试数值。工程中使用反滤料应采取的措施;工程中使用不合格反滤料易造成的危害,进而提出了水工反滤料的工程规格。 相似文献
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石墨烯是一种准二维材料,且其只有一个碳原子厚度。它的力学、热学、电学等性能非常优越,是目前材料科学领域的研究热点。文中在现有功能化石墨烯及其水泥基复合材料研究成果的基础上,综述了石墨烯的功能化及基于石墨烯的水泥基复合材料的性能研究,为进一步开展石墨烯水泥基复合材料的研究奠定基础。 相似文献