共查询到20条相似文献,搜索用时 140 毫秒
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纳米材料几何尺寸小、比表面积大,具有广阔的应用前景。以聚合物负载纳米材料能抑制其聚集、提高稳定性,更好地实现其功能。本文总结了聚合物负载纳米材料的制备方法,探讨了这些复合材料在催化领域中的应用,并对其发展趋势作了总结和展望。 相似文献
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盐包合材料 (Salt-Inclusion Materials, SIMs) 是一类具有独特的主体结构和客体盐组合的新型无机晶体材料,其具有特定的多孔结构、可填充性和灵活多变的拓扑结构而引起了研究者们的兴趣。SIMs的合成具有很大的挑战性,大部分都是偶然生长所得,为将其发展为可应用的材料,理解其合成规律、晶体化学及其相关性能非常重要。本文综述了近年来文献报道的高温熔盐法合成得到的典型SIMs,从晶体框架结构对其分类,针对一些结构独特的SIMs进行了重点讨论并总结其特点。最后,本文介绍了SIMs在环境、光电、热电和荧光领域的潜在应用。对于其未来发展,仍需进一步研究SIMs晶体化学以探索其性能及应用。 相似文献
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光化学比色传感器阵列以其价格低廉、方法简单、响应快速、信息量大等优点,得到了日益广泛的应用。本文主要介绍了光化学比色传感器阵列的研究进展,概括了近年来其在气体、生物样品、离子和小分子,以及混合物检测方面的应用,针对其不同原理及性能展开了讨论,并展望了其研究和应用前景。 相似文献
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FAN Lin-Lin PENG Shu-Hui WEN Cheng-Rong HE Ming-Xiang WEI Xue-Qi WU Chun-Hua YAO Min-Na FENG Rui PANG Jie 《结构化学》2012,31(4):605-613
Biological activity of konjac glucomannan is closely related to its structure,in particular to its high-level structure.Researches on the activity mechanism of konjac glucomannan are significant for revealing the mysteries of participation in life activity.In this paper,analysis of the effects of konjac glucomannan configuration and various factors on its structure and activity was conducted,mechanism of biological activity of konjac glucomannan was explored,and the hot research topic of konjac glucomannan was given. 相似文献
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吲哚啉螺吡喃是一种重要的光致变色化合物,由于具有良好的变色回复性、抗疲劳性而得到广泛的关注.本文合成了1′-羟乙基-3′,3′-二甲基吲哚啉- 6-硝基螺吡喃,研究了该化合物在紫外-可见光交替照射下紫外吸收强度的变化,并测试了光照前后化合物的荧光光谱.在开环态时,化合物具有优良的荧光性能,可以成功应用于细胞成像,在活细胞中可获得清晰的荧光成像图,同时也可以发挥螺吡喃光致变色可循环、耐疲劳等优势. 相似文献
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This study analyses the possibility of reprocessing used poly(vinylidene fluoride), PVDF, maintaining the main properties critical for its use in piezoelectric sensor/actuator applications. The influence of multiple reprocessing cycles of PVDF on crystallinity and ß-phase content fundamental for its electroactive behaviour, was studied. Nine reprocessing cycles were completed and it was found that the material preserved the characteristics required for its use as piezoelectric polymer without significant degradation. 相似文献
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Nikulin S. S. Misin V. M. Komarov V. M. Misin M. V. 《Russian Journal of Applied Chemistry》2003,76(8):1327-1330
2-Vinylphenothiazine was prepared, and its polymerization was studied. The possibility of using 2-vinylphenothiazine and its polymer as antioxidant in industrial rubber formulations was examined. 相似文献
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Jie Chen Panduka Koswatta J. Robb DeBergh Peng Fu Ende Pan John B. MacMillan Joseph M. Ready 《Chemical science》2015,6(5):2932-2937
Nigricanoside A was isolated from green alga, and its dimethyl ester was found to display potent cytotoxicity. Its scarcity prevented a full structure elucidation, leaving total synthesis as the only means to determine its relative and absolute stereochemistry and to explore its biological activity. Here we assign the stereochemistry of the natural product through enantioselective total synthesis and provide initial studies of its cytotoxicity. 相似文献
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A combined method for determination of the standard enthalpies of formation of nitroform and its salts was proposed. The enthalpies
of dissolution of nitroform and its ammonium, hydrazinium, guanidinium, and potassium salts in water were measured. The enthalpy
of combustion of hydrazinium salt of nitroform was determined by a combustion calorimetry, and its standard enthalpy of formation
was calculated. The enthalpy of formation of trinitromethyl anion in indefinitely diluted aqueous solution −24.94±0.79 kJ
mol−1, was calculated on the basic of the data obtained for enthalpies of formation and dissolution of ammonium and hydrazinium
salts of nitroform. Standard enthalpies of formation of nitroform and its salts were calculated.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 12, pp. 2451–2454, December, 1998. 相似文献
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Rózyło TK Siembida R Nemeth ZI Albert L Tyihak E 《Biomedical chromatography : BMC》2000,14(3):173-179
Taking into consideration the unquestionable intracellular occurrence of formaldehyde (HCHO) and its generators in cells of plant, animal and human organisms as well as in body fluids it was resolved to determine their levels in hard tissues of physiologically and pathologically changed teeth. The aim of the work was to determine the relationship between the level of HCHO and the levels of its generators in pathologically changed teeth, mainly carietic teeth as tooth caries is still a serious and commonly occurring problem. The occurrence of HCHO (captured as its dimedone adduct) and some of its potential generators was demonstrated in the hard tissues of healthy and pathological human teeth by means of OPLC, HPLC and MS analyses. It was established that the measurable level of HCHO was increased in the carietic teeth in comparison with healthy ones. In the case of paradontic tooth sample, a dramatic increase of HCHO was observed and at the same time the level of betaines was decreased considerably. The obtained results give a new insight into the pathology of hard tissues of teeth in strong correlation with the phases of stress syndrome. 相似文献
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静电场诱导十二烷基硫酸钠结晶行为的研究 总被引:4,自引:0,他引:4
用透射电镜、X射线衍射及DSC等方法 十二烷基硫酸钠(SDS)极稀水溶液(溶液介于临界聚集浓度和临界胶束浓度之间)在静电场作用下的结晶行为,静电场作用诱导SDS形成规则的四方单晶与从甲醇中重结晶所得样品的晶体结构相同,DSC结果表明,从有序到无序结构变化的一级相转变热焓相同,但由于电场诱导结晶的晶体较小而表现为转变温度的降低,没有施加静电场处理的样品只具有较低的有序程度。 相似文献
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采用超高效聚合物色谱(APC)技术,以单甲氧基聚乙二醇丙醛(m PEG_p ALD)为代表,测定了聚乙二醇衍生物的相对分子质量及其分布和杂质含量,优选了色谱柱和流动相,考察了样品质量浓度变化以及溶解时间等对测定结果的影响。优化后3根超高效凝胶色谱柱串联,在柱温40℃,流动相95%甲醇,流速0.5m L/min,示差折光检测条件下,对m PEG_p ALD的分子量及其分布进行测定,同时得到杂质的相对含量。结果测得m PEG_p ALD主成分的重均分子量(Mw)为19 444,分布指数(D)为1.01;杂质1的Mw为38 703,D为1.01,含量为1.31%;杂质2的Mw为61 036,D为1.00,含量为0.70%。与常规凝胶渗透色谱(GPC)相比,该方法分辨率高,分析速度快,能快速测定m PEG_p ALD的相对分子量及其分布,并能得到其纯度和杂质含量,为其工艺研发、质量控制提供了科学的依据,同时也可用于其它PEG衍生物的相对分子量及其分布和纯度的测定。 相似文献