原位聚合沉积聚苯胺薄膜及其电致变色性能

采用原位聚合的方法,以水溶性高分子聚乙烯吡咯烷酮(PVP)为空间稳定剂,直接在玻璃基体表面聚合沉积导电聚苯胺(PANI)薄膜。用扫描电镜(SEM)、紫外可见光谱(UV-Vis)、四探针电导率测试仪和热重分析仪(TG)对聚苯胺膜结构及性能进行了表征。采用循环伏安法测试了薄膜的电致变色性。结果表明:盐酸掺杂聚苯胺薄膜呈翠绿色,薄膜厚115 nm,表面电导率为4.6×10-3S/cm。电致变色实验中聚苯胺电极电位在-6~ 6 V循环变化时,薄膜颜色在黄绿和蓝绿间可逆变化。电致变色前后聚苯胺薄膜的紫外可见吸收光谱表明,随着电极电位的降低,极化子峰发生红移,说明聚苯胺分子链中醌式结构单元被还原,聚苯胺薄膜质子化程度提高。     

丙炔醇类和丙二烯醇类化合物对映体的气相色谱拆分

使用全甲基-β-环糊精柱(Rt-βDex^TM~cst柱),对5种丙炔醇类和4种丙二烯醇类化合物对映体的气相色谱分离方法进行了研究,结果4种丙炔醇类和4种丙二烯醇类对映体得到分离,分离因子α为1.01～1.04,分离度R一般大于1.5。方法已用于实际不对称合成样品ee值的测定。探讨了对映体在该柱上的拆分机理,认为烷基取代基适当的疏水性和大小是降低非特异性相互作用、形成相对稳定的不对称环糊精包合物,从而成功拆分光学活性异构体的关键。     

2-碘-3-苯亚磺酰基-2-丙烯基-1-醇类化合物自身化学电离质谱研究

四级质谱仪上采用自身化学电离的方法测定2-碘-3-苯亚磺酰基-2-丙烯基-1-醇及其6个衍生物.通过分子离子峰(MH+)和特征碎片离子峰提供的分子结构信息,确证上述化合物的结构.方法简便,迅速,准确.     

Dielectric loaded surface plasmon polariton properties of the Al_2O_3–Al nanostructure

Surface plasmons(SPs) in ultraviolet(UV) have attracted a great deal of attention because of their emerging applications in energy resources, environmental protection, and biotechnology. In this article, the dielectric loaded surface plasmon polariton(DLSPP) properties of the Al_2O_3–Al nanostructure are investigated theoretically. Sharp SP responses can be obtained in deep UV by setting an insulator grating on the aluminum film. It is found that the height of the grating element,the lattice parameter, and the filling factor can all modulate the DLSPPs of the Al_2O_3–Al nanostructure. We further find that this structure is sensitive to the embedding medium and can serve as a refractive index sensor in the UV region. The corresponding sensitivity increases with the decrease of the filling factor. The Al_2O_3–Al nanostructure may be useful for medical diagnostics and biotechnology in deep UV.     

基体表面性质对原位聚合沉积导电聚苯胺薄膜性能的影响

以水溶性高分子聚乙烯吡咯烷酮(PVP)为空间稳定剂,在经十八烷基三氯硅烷(OTS)改性的玻璃表面进行原位聚合,沉积得到导电聚苯胺(PANI)薄膜。采用表面界面张力仪、扫描电镜(SEM)、紫外可见光谱(UV-Vis)、红外光谱(FT-IR)、四探针电导率测试仪及光学显微镜对不同基体表面的接触角、PANI膜的形貌、厚度、结构、导电性及其在亲/憎水表面选择性沉积性能进行测定。结果表明:OTS对玻璃表面的改性促进了聚苯胺的沉积且提高了薄膜厚度,薄膜饱和厚度达到200 nm;缩短了溶液中苯胺分散聚合的诱导期,反应速率增大;与未改性玻璃表面沉积的薄膜相比,改性的玻璃表面得到的聚苯胺薄膜更加细密均匀,聚苯胺颗粒尺寸小,堆积紧密;薄膜的电导率达到7.5×10-3S/cm;OTS改性对基体表面的薄膜生长和溶液中的苯胺聚合具有催化作用。     

1，2－联烯亚砚和1，2－联烯砜的反应

1，2－联烯亚砜和1，2－联烯砜是重要的含硫联烯化合物，综述了1，2－联烯 亚砜和1，2－联烯砜的亲核加成、亲电加成、Diels-Alder反应、1，3－偶极加成 、[2+2]环加成等反应以及在天然产物中的应用。     

Broadband low-frequency acoustic absorber based on metaporous composite

Broadband absorption of low-frequency sound waves via a deep subwavelength structure is of great and ongoing interest in research and engineering. Here, we numerically and experimentally present a design of a broadband low-frequency absorber based on an acoustic metaporous composite (AMC). The AMC absorber is constructed by embedding a single metamaterial resonator into a porous layer. The finite element simulations show that a high absorption (absorptance A>0.8) can be achieved within a broad frequency range (from 290 Hz to 1074 Hz), while the thickness of AMC is 1/13 of the corresponding wavelength at 290 Hz. The broadband and high-efficiency performances of the absorber are attributed to the coupling between the two resonant absorptions and the trapped mode. The numerical simulations and experimental results are obtained to be in good agreement with each other. Moreover, the high broadband absorption can be maintained under random incident acoustic waves. The proposed absorber provides potential applications in low-frequency noise reduction especially when limited space is demanded.     

手性3-氧杂双环[3.1.0]-己-2-酮类化合物的不对称合成

采用手性铜催化剂(S)-7644, 利用重氮醋酸不饱和酯的分子内不对称卡宾加成环化, 合成了七个光学活性3-氧杂双环[3.1.0]-己-2-酮类化合物。产品经元素分析、红外、核磁确证了结构, 并测定了比旋光度和光学收率。     

点缺陷阵列对声子晶体波导定向辐射性能的影响

将点缺陷阵列应用于声子晶体波导,提出一种具有高定向辐射性能的复合声子晶体波导. 基于有限元法的数值分析表明,附加到声子晶体波导表面的点缺陷阵列可激发出作为次级声源的谐振模. 谐振模辐射的声波与波导出射端口直接辐射的声波相互干涉,可以使声子晶体波导的法向辐射声压提高161.21%、发散角减小85.35%. 当点缺陷的数目增大到一定程度后,波导的定向辐射性能不再有明显的改善. 该研究为改善波导的定向辐射性能提供了一种新方法. 关键词： 声子晶体波导 点缺陷 谐振模 定向辐射     

玻璃表面原位聚合沉积pani薄膜机理的探讨

分散聚合;原位沉积;聚苯胺薄膜;纳米sio2;生长机理