共查询到18条相似文献,搜索用时 125 毫秒
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石质文物表面生物矿化保护材料的仿生制备 总被引:16,自引:0,他引:16
许多濒危石质文物急需进行保护处理. 但是, 调查表明已经使用过的表面防护材料很难令人满意, 探索新的石质文物保护材料已是当务之急. 本工作以石质文物表面天然生成的生物矿化膜为仿生合成目标, 依据生物矿化的原理, 以硫酸软骨素作为有机模板, 草酸钙的亚稳过饱和溶液作为无机前驱物, 室温下在石材表面仿生合成了主要成分为一水草酸钙的无机表面保护材料. 其制备工艺用正交试验进行了优化; 结构和形貌用X射线衍射分析仪和原子力显微镜进行了表征; 通过憎水性、耐污性和耐酸性试验进行了合成膜的保护性能测试, 效果良好. 本方法为开拓新的石质文物保护材料提供了思路. 相似文献
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将改性膨润土引入到丙烯酰胺基水凝胶体系中,通过控制组分比例、温度和反应时间等因素,成功构筑了粘接修复型膨润土基水凝胶(AR-gel)材料,并实现了对破损和断裂的砂岩文物的高效修复.AR-gel中膨润土的存在提高了其与砂岩文物之间的兼容性,展现出了极好的粘接性,且粘接修复完整的文物接缝处无明显粘接痕迹,无泛白变色现象,不影响被粘接文物的整体美观;同时,粘接过程中的溢胶,可用水轻易去除.修复过后的砂岩形貌与性能与砂岩对照样品基本一致,表明了AR-gel高粘接性能的同时,不会对砂岩基体造成二次破坏.通过严苛的冻融老化循环和盐结晶湿热循环老化试验验证了该AR-gel材料对砂岩的耐久性粘接保护,并分析了保护机理:砂岩与AR-gel间通过强氢键、Si-O-Si键、Si-O-M键、质子化和离子键、机械咬合等作用牢固结合在一起.此外,AR-gel对玻璃、金属、砂岩、陶瓷和陶器等各种材质的文物均具有极好的粘接性能.本研究工作为开发耐久性文物粘接修复保护材料提供了新方法和新思路. 相似文献
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聚合物固态电解质相比于液态电解质表现出更良好的热稳定性,并且对比无机固态电解质具有机械性能好、耐候性好和易加工成型等特点,因此在下一代高能量密度储能装置中极具应用潜能.然而,固态电解质与正负极材料之间的界面稳定性问题阻碍了其实际应用.本文总结了锂离子聚合物固态电解质的关键特性,讨论了聚合物固态电解质与高电压正极的普遍界面问题,包括界面接触不良与界面不稳定问题.分析了导致高电压富镍氧化物正极材料与聚合物固态电解质严重界面问题的主要因素,针对相关因素总结了缓解界面问题的有效策略,并展望了未来聚合物固态电解质与富镍层状氧化物的界面性能提升的研究方向,为基于聚合物固态电解质与高电压正极材料固态锂电池的研究提供参考. 相似文献
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含钒无机有机杂化材料的结构复杂多样,在吸附、氧化还原、电化学、催化、光学、磁学以及多孔、手性材料研究等方面应用前景广阔,引起人们广泛关注。本文综述了含钒无机有机杂化材料研究的最新进展,介绍了合成含钒无机有机杂化材料的主要方法,按照有机组分与无机骨架作用的方式分类总结了含钒无机有机杂化材料的结构,介绍了其在离子交换、电化学、磁学、光学、催化等方面的应用,并展望了该类材料的研究前景和意义。 相似文献
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Qian Chen Wen-Ya Wen Feng-Xian Qiu Ji-Cheng Xu Han-Qiang Yu Ming-Liang Chen Dong-Ya Yang 《Chemical Papers》2016,70(7):946-959
There are large numbers of paper cultural relics in China, the country where paper making was invented. However, the paper relics have not been adequately protected so they are at risk of ageing, damage and disappearance. In order to better protect the paper relics, modified carboxymethyl cellulose/Si/polyacrylate protective materials were prepared with acrylicresin and modified carboxymethyl cellulose which has a good affinity with the paper and modified silica, improving the mechanical strength and ability to withstand weathering. The modified CMC/Si/polyacrylate protective material was analysed using infrared spectroscopy, transmission electron microscopy, differential scanning calorimetry and other performance-testing devices. The surface morphology of the paper samples was analysed using scanning electron microscopy. The protective material so prepared was evaluated by subjection to accelerated ageing (dry heat treatment). The results showed the protective material films to have good hydrophobicity, acid/alkali resistance and mechanical strength. When the content of SiO2 is 6 mass %, the protective material has an excellent comprehensive performance. The results of the ageing test reveal that the prepared material can effectively slow down the ageing rate. The prepared material is suited to the protection of paper cultural relics. 相似文献
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While a great variety of high temperature polyimide materials exist, these materials are being subjected to higher and higher use temperatures in oxidative and environmentally aggressive environments. There is a limit to the extent one can take a polyimide before it will oxidize and subsequently suffer property degradation, thermal decomposition, and structural failure. Therefore, we instead sought to use materials which do not oxidize (inorganic materials) to enhance the polyimide composition and perhaps move the properties of the organic polymer more into the realm of ceramics while maintaining polyimide composite weights and processing advantages. In this paper we present results of the combination of inorganic micron sized particles with and without carbon nanofibers to produce a variety of highly inorganic particle filled polyimides. These polyimides were tested for thermal stability and flammability in resin pellet form and as a protective coating for a carbon-fiber composite structure. Our results demonstrate that the resin with inorganic particles exhibited significant reductions in flammability by themselves, but minimal flammability reduction when used as a thin coating to protect a carbon-fiber composite. Further, the gains in thermal stability are limited by the thermal stability of the polyimide matrix, suggesting that more work is needed in measuring the limits of inorganic fillers to improve thermal stability. Still, the results are promising and may yield polyimide systems useful for providing resistance to damage from high heat flux exposures/fire risk scenarios. 相似文献
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溶胶-凝胶法合成聚(甲基丙烯酸乙酯-甲基丙烯酸环氧丙酯)/SiO_2杂化聚合物材料 总被引:11,自引:0,他引:11
通过溶胶 凝胶过程合成了一系列存在相间偶联键的杂化聚合物材料 .IR分析证实了在无机组份与有机组份间存在碳氮键 ,其特征吸收峰在 1 2 5 0cm-1.DSC的测试结果则表明无机组份含量的增加提高了材料的Tg 值 ,从而提高了杂化材料的使用温度 .利用小角X ray散射 (SAXS)和电镜 (TEM)分析了不同无机组份、不同酸度下体系的形态结构 ,结果表明当无机组份与有机组份的摩尔比为 1∶1且体系的酸度适当时相容性最好 . 相似文献
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Gelatin, a natural polymer, provides excellent tissue compatibility for use in tissue rehabilitation. Bioactive glasses (BAG) offer superior capacity in stimulating a bioactive response but show high variability in uptake and solubility. To tackle these drawbacks, a combination of gelatin with BAG is proposed to form composites, which then offer a synergistic response. The cross-linked gelatin structure’s mechanical properties are enhanced by the incorporation of the inorganic BAG, and the rate of BAG ionic supplementation responsible for bioactivity and regenerative potential is better controlled by a protective gelatin layer. Several studies have demonstrated the cellular benefits of these composites in different forms of functional modification such as doping with zinc or incorporation of zinc such as ions directly into the BAG matrix. This review presents a comprehensive perspective on the individual characteristics of BAG and gelatin, including the synthesis and mechanism of action. Further, adaptation of the composite into various applications for bone tissue engineering is discussed and future challenges are highlighted. 相似文献
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寻找理想的骨修复材料一直是骨科领域的研究热点之一。骨修复材料已由最初单纯取代天然骨组织的惰性材料向具有诱导骨组织再生功能的生物活性材料发展,其中有机-无机杂化材料由于有机和无机组分在分子/纳米水平的复合使其能够最大程度地实现二者的优势互补和协同优化,近年来受到广泛关注。本文着重介绍了有机-无机杂化骨修复材料近些年来的研究进展,并对其发展趋势进行了展望。 相似文献
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Dr. Jintao Wang Dr. Yunfei Liu Dr. Xiaotian Chen Dr. Chen Chen Prof. Ping Chen Prof. Zhaokui Wang Prof. Yu Duan 《Chemphyschem》2019,20(20):2580-2586
As extremely important inorganic materials, metal oxides play an irreplaceable role in solid perovskite solar cells. In this review, the preparation methods of metal oxides, their effects on the perovskite optoelectronic devices incorporated with the energy level compatibility of perovskite materials are provided. Finally, the possible reactions between interfaces during growth progress as well as passivation mechanism of some metal oxides to perovskite materials are discussed. The physical, chemical, and electrical properties of functional metal oxides endow the enhancement of the efficiency and stability of perovskite photovoltaic devices. 相似文献