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Multifunctional TiO2/Ag composite nanowires are fabricated with a hydrothermal method by precipitating Ag nanoparticles (NPs) on the surfaces of TiO2 nanowires. This hierarchical one-dimensional (1D) nanostructure can be used as a surface enhanced Raman scattering (SERS) substrate with high sensitivity, for detecting the rhodamine 6G (R6G) in a wide range of low concentrations (from 1 × 10 6 M to 1 × 10-12 M). In addition, the substrate can be self-cleaned under the irradiation of ultraviolet (UV) light due to the superior photocatalytic capacity of the TiO2/Ag composite nanostructure, making the recycled use of SERS substrates closer to reality. With both the evident SERS performance and high efficiency of photocatalytic capacity, such TiOz/Ag composite nanowires demonstrate considerable potential in the chemical sensing of organic pollutants. 相似文献
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ICP-AES测定镁合金中的痕量Zr、Fe、Ni 总被引:1,自引:1,他引:0
用ICP-AES同时测定了镁合金中痕量Zr,Fe,Ni等杂质元素,不采用基体匹配法,研究了基体元素和共存元素对分析元素的光谱干扰,并进行了加入回收试验,精密度试验和方法检出限的测定。方法准确可靠,简便快速。 相似文献
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以正丁基锂(n-BuLi)为引发剂,叔丁醇钾(t-BuOK)和苯酚钾(POK)为副反应抑制剂,实现了甲基丙烯酸甲酯(MMA)在四氢呋喃(THF)溶剂中的阴离子聚合。采用凝胶渗透色谱(GPC)、核磁共振氢谱(1 H-NMR)等研究了产物的数均分子量、分子量分布(MWD)和分子结构。结果表明:t-BuOK与n-BuLi之间发生反离子交换反应使活性中心的反离子Li~+被K~+替换,从而在一定程度上抑制了MMA聚合过程中的副反应,当n(t-BuOK)/n(n-BuLi)≥10时,可在0℃下实现MMA的可控阴离子聚合;PMMA分子量分布较窄(1.22),且数均分子量与设计值十分接近,MMA聚合的副反应得到了有效控制;进一步添加的POK能与活性中心的K~+配合,促进对MMA聚合副反应的抑制,使MMA的可控阴离子聚合能在较高温度(40℃)下得以实现,所合成的聚甲基丙烯酸甲酯(PMMA)数均分子量分布窄(1.24)且数均分子量符合设计值。 相似文献
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以酚锂作为副反应抑制剂, 以正丁基锂或1,1-二苯基乙烯盖帽的正丁基锂为引发剂, 通过顺次添加单体的方法, 合成了结构明确的聚异戊二烯-b-聚甲基丙烯酸甲酯(PI-b-PMMA)和聚甲基丙烯酸正丁酯-b-聚甲基丙烯酸甲酯(PBMA-b-PMMA)2种嵌段聚合物. 嵌段聚合反应中甲基丙烯酸甲酯(MMA)的转化率均高于90%, 通过核磁图谱计算的链节摩尔比与理论设计值吻合. PI-b-PMMA和PBMA-b-PMMA的分子量分别达到4×104和1.6×104. 在环己烷中, 通过顺次添加单体的方法, 合成了结构明确的聚苯乙烯-b-聚异戊二烯-b-聚甲基丙烯酸甲酯(PS-b-PI-b-PMMA)三嵌段共聚物, 各单体的转化率均达到100%, 并且产物中的链节摩尔比和理论设计值一致, 最终产物的分子量达到7.4×104, 分子量分布仅为1.28, 为极性三嵌段热塑性弹性体以及有机玻璃透明增韧剂的工业化奠定了基础. 相似文献
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Charge transfer and variation of potential distributions in the formation of 4, 4'-bipyridine molecular junction
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In this paper the charge transfer and variation of potential distribution upon formation
of 4, 4'-bipyridine molecular junction have been investigated by applying
hybrid density-functional theory (B3LYP) at ab initio level. The numerical results
show that there exist charge-accumulation and charge-depletion regions
located at respective inside and outside of interfaces. The variation of
potential distribution is obvious at interfaces. When distance between
electrodes is changed, the charge transfer and variation of potential
distribution clearly have distance-dependent performance. It is demonstrated
that the contact structure between the molecule and electrodes is another
key factor for dominating the properties of molecular junction. The
qualitative explanation for experimental results is suggested. 相似文献
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用溴乙烷部分季胺盐化的聚4-乙烯基吡啶(EBQP4VP)-Cu(Ⅱ)络合物具有类氧化酶特性,它在25℃下催化氢醌的氧化反应是典型的 Michaelis-Menten型动力学行为,络合物分子链的构象和静电效应随“静态”-微化学环境和“动态”-溶液条件变化而异。因而,高分子-Cu(Ⅱ)络合物溶液的催化活性和比浓粘度随着高分子配体季胺盐化度(Q)、溶液PH值、离子强度、温度、乙醇组成和Cu(Ⅱ)离子浓度的不同而变化。 相似文献
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