Carbon-free basic dry vibration mix was prepared using middle grade magnesia and fused magnesia as main starting materials,metasilicate replacing phenolic resin as binder,adding a certain amount of medium and low temp...Carbon-free basic dry vibration mix was prepared using middle grade magnesia and fused magnesia as main starting materials,metasilicate replacing phenolic resin as binder,adding a certain amount of medium and low temperature intensifiers. Effects of binder,grain composition,and additives on basic dry vibration mix for tundish were studied,and the bonding mechanism was also analyzed. The results show that：（1） when using metasilicate as binder,the higher strength can be acquired; （2） the suitable grain composition is q=0.48,the critical granularity is 5 or 3 mm,the fines addition is 10%-20% （mass percent）; （3） the strength and corrosion resistance of the basic dry vibration mix can be improved by the melting compound of metasilicate and additives; （4） with temperature rising,the bonding type in dry vibration mix changes from cohere bonding to reaction bonding,and then to ceramic bonding at last.展开更多
A new silver complex salt [Ag(N2C11H10)2]NO3 (where N2C11H10 = 4,5-dihydro-1H-benzo[g]indazole), has been synthesized and characterized by elemental and thermal analyses, IR and 1HNMR spectroscopies, single crystal X-...A new silver complex salt [Ag(N2C11H10)2]NO3 (where N2C11H10 = 4,5-dihydro-1H-benzo[g]indazole), has been synthesized and characterized by elemental and thermal analyses, IR and 1HNMR spectroscopies, single crystal X-ray structure determination and DFT studies. Its molecular structure comprises of a silver center coordinated to two nitrogen atoms from two 4,5-dihydro-1H-benzo[g]indazole molecule giving rise to a cationic complex entity, [Ag(N2C11H10)2]+ with as counter ion. The bulk structure is consolidated by N–H…O, C–H…π, Ag…π and Ag…O intermolecular interactions, thus generating a pseudo-helical network. The optimized structure, frontier molecular orbitals (HOMO and LUMO) and global reactivity descriptors were investigated by performing DFT calculations.展开更多
以环氧氯丙烷(EPIC)与十二烷基二甲基胺在丙酮溶剂中反应,然后与己二酸酯化合成含酯基Gem in i型季铵盐表面活性剂:3,3′-己二酰氧基-2,2′-二羟基-二丙基-双(十二烷基二甲基氯化铵),它可生物降解。用正交实验法对其合成条件进行了优化...以环氧氯丙烷(EPIC)与十二烷基二甲基胺在丙酮溶剂中反应,然后与己二酸酯化合成含酯基Gem in i型季铵盐表面活性剂:3,3′-己二酰氧基-2,2′-二羟基-二丙基-双(十二烷基二甲基氯化铵),它可生物降解。用正交实验法对其合成条件进行了优化,在优化的合成条件下反应产率达65.3%。用IR1、HNMR、元素分析方法对产物结构进行了表征。其性能测试结果显示,临界胶束浓度为1.43×10-5mol/L,表面张力为38.7 mN.m-1,有优良的织物柔软性能。展开更多
为了研究五唑非金属盐氢键的形成规律以及对稳定性的影响,采用约化密度梯度(Reduced density gradient,RDG)理论分析方法,对文献已报到的15种五唑非金属盐单晶结构中单一N^-5离子及其周围阳离子的氢键相互作用进行了研究。从各个化合物...为了研究五唑非金属盐氢键的形成规律以及对稳定性的影响,采用约化密度梯度(Reduced density gradient,RDG)理论分析方法,对文献已报到的15种五唑非金属盐单晶结构中单一N^-5离子及其周围阳离子的氢键相互作用进行了研究。从各个化合物单晶结构获取氢键键长,利用RDG分析获取其强度。结果表明,N^-5离子可与具有电正性的N—H和O—H质子给予体形成N—H…N和O—H…N两类氢键。O—H…N氢键较强,而N—H…N氢键较弱。影响N^-5离子稳定性的因素主要是N^-5离子的结构对称性和成晶体平面层状的类石墨烯结构。在氢键作用下,N^-5离子保持良好的结构对称性(双胍五唑盐,10)和类石墨烯结构(3,6,7-三氨基-7H-[1,2,4]三唑[4,3-b]并[1,2,4]三唑五唑盐,12)可明显提高稳定性,使分解温度达到124.8℃和120.9℃。相反,氢键作用若使N^-5离子结构形变严重导致对称性缺失同时未能提供平面堆积(草酰肼五唑盐,3和4,4',5,5'-四氨基-3,3'-双-1,2,4-三唑五唑盐,4),则N^-5离子稳定性下降明显,分解温度仅95℃。展开更多
文摘Carbon-free basic dry vibration mix was prepared using middle grade magnesia and fused magnesia as main starting materials,metasilicate replacing phenolic resin as binder,adding a certain amount of medium and low temperature intensifiers. Effects of binder,grain composition,and additives on basic dry vibration mix for tundish were studied,and the bonding mechanism was also analyzed. The results show that：（1） when using metasilicate as binder,the higher strength can be acquired; （2） the suitable grain composition is q=0.48,the critical granularity is 5 or 3 mm,the fines addition is 10%-20% （mass percent）; （3） the strength and corrosion resistance of the basic dry vibration mix can be improved by the melting compound of metasilicate and additives; （4） with temperature rising,the bonding type in dry vibration mix changes from cohere bonding to reaction bonding,and then to ceramic bonding at last.
文摘A new silver complex salt [Ag(N2C11H10)2]NO3 (where N2C11H10 = 4,5-dihydro-1H-benzo[g]indazole), has been synthesized and characterized by elemental and thermal analyses, IR and 1HNMR spectroscopies, single crystal X-ray structure determination and DFT studies. Its molecular structure comprises of a silver center coordinated to two nitrogen atoms from two 4,5-dihydro-1H-benzo[g]indazole molecule giving rise to a cationic complex entity, [Ag(N2C11H10)2]+ with as counter ion. The bulk structure is consolidated by N–H…O, C–H…π, Ag…π and Ag…O intermolecular interactions, thus generating a pseudo-helical network. The optimized structure, frontier molecular orbitals (HOMO and LUMO) and global reactivity descriptors were investigated by performing DFT calculations.
文摘以环氧氯丙烷(EPIC)与十二烷基二甲基胺在丙酮溶剂中反应,然后与己二酸酯化合成含酯基Gem in i型季铵盐表面活性剂:3,3′-己二酰氧基-2,2′-二羟基-二丙基-双(十二烷基二甲基氯化铵),它可生物降解。用正交实验法对其合成条件进行了优化,在优化的合成条件下反应产率达65.3%。用IR1、HNMR、元素分析方法对产物结构进行了表征。其性能测试结果显示,临界胶束浓度为1.43×10-5mol/L,表面张力为38.7 mN.m-1,有优良的织物柔软性能。
文摘为了研究五唑非金属盐氢键的形成规律以及对稳定性的影响,采用约化密度梯度(Reduced density gradient,RDG)理论分析方法,对文献已报到的15种五唑非金属盐单晶结构中单一N^-5离子及其周围阳离子的氢键相互作用进行了研究。从各个化合物单晶结构获取氢键键长,利用RDG分析获取其强度。结果表明,N^-5离子可与具有电正性的N—H和O—H质子给予体形成N—H…N和O—H…N两类氢键。O—H…N氢键较强,而N—H…N氢键较弱。影响N^-5离子稳定性的因素主要是N^-5离子的结构对称性和成晶体平面层状的类石墨烯结构。在氢键作用下,N^-5离子保持良好的结构对称性(双胍五唑盐,10)和类石墨烯结构(3,6,7-三氨基-7H-[1,2,4]三唑[4,3-b]并[1,2,4]三唑五唑盐,12)可明显提高稳定性,使分解温度达到124.8℃和120.9℃。相反,氢键作用若使N^-5离子结构形变严重导致对称性缺失同时未能提供平面堆积(草酰肼五唑盐,3和4,4',5,5'-四氨基-3,3'-双-1,2,4-三唑五唑盐,4),则N^-5离子稳定性下降明显,分解温度仅95℃。
