Materials Literature
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Mn1.56Co0.96Ni0.48O4 films with spinel structure for infrared detection are prepared on Al2O3 substrate by chemical solution deposition method. The resistance vs temperature (R-T) characteristics at 130~304 K temperature range and infrared transmission spectrum (1-10 μm) are measured and temperature coefficients of re…
A simple wet-chemical route has been employed to synthesize β-ZnS nanoparticles with diameter of ca.15-20 nm. The far-infrared characteristics of β-ZnS nanoparticles are investigated by terahertz time-domain spectroscopy (THz-TDS) over the frequency range from 0.3 to 2.5 THz. The observed results show two obvious abso…
SiO2 and SiO2-TiO2 composite nanoporous coating was successfully prepared via sol-gel method in this paper. By the control of the different porosity of SiO2 coating and content of TiO2 in the mixture, the refractive index of the coatings can be adjusted from 1.17 up to 2.20 continuously, which can be well matched with…
Pyroelectric materials take the most important role in pyroelectric infrared detectors. A high temperature above 550°C is required to obtain the traditional pyroelectric films such as PZT, BST, etc., which would hold back the realization of integration of pyroelectric thin film monolithic uncooled focal plane array (U…
This work reported a preliminary study of doped ZnO nanoparticles by fine optical group-IB element Ag as the foundation to achieve p-type conduction of ZnO. Ag-doped ZnO nanoparticles were synthesized under lower temperature by annealing treatment in water-soluble silicone oil to the precursor [Zn(OH)4]2- with Ag+ pre…
The Debye characteristic temperature is a useful parameter of nanodiamond thin films. In this paper, the Debye characteristic temperature of diamond thin films is studied through X-ray diffraction intensity at a fixed temperature. From x-ray diffraction, we can get the average crystallite size of diamond thin film. By…
Purpose The purpose of this paper is to explore the previously unreported phenomenon in which changes occur to the particle size distributions of calcium carbonate fillers, used in papermaking, when exposed to high intensity ultrasound. Design/methodology/approach Commercial paper pulps sonicated at a frequency of 20…
以4,4′-(α,ω-亚烷基二酰氧)二联苯甲酰氯(M1)、顺式-4,4′-双(4-羟基苯基偶氮)二苯并-18-冠-6(M2)、反式4,4′-双(4-羟基苯基偶氮)二苯并-18-冠-6(M3)和1,10-癸二醇(M4)为单体,通过溶液共缩聚反应,合成了两个系列新的含联苯型液晶基元和偶氮型冠醚环的主链型液晶共聚酯.共聚酯的［η］在0.25～0.35和0.27～0.38之间.单体的化学结构通过IR、UV-Vis、1H-NMR、MS和元素分析等方法确证.共聚酯的性质采用［η］、DSC、TGA、WAXD和POM等方法进行了研究.发现所有的共聚酯加热到各自熔融温度以上都能形成向列相液晶态,可以观察到向列相的丝状织构或纹影织构或球粒织构.共聚…
使用挤出机对乙丙共聚物Versify2300（乙烯含量12 wt％）（V-2300）进行马来酸酐（MAH）和苯乙烯（St）多单体熔融接枝得到接枝物Versify-g-(MAH-co-St) (g-V-2300).通过SEM、FTIR和力学性能测试，研究了g-V-2300对PA6/(V-2300+g-V-2300)(70/30)共混物形态和性能的影响.研究结果表明，随着 g-V-2300含量的提高，V2300分散相粒径不断减小且分散均匀.当 g-V-2300比例为25 wt％时，分散相尺寸只有0.27 μm，此时共混物的izod冲击强度达到324.54 J/m，为PA6/(V-2300+g-V2300)(70/(30+0))共混…
4-乙烯基吡啶(4-VP)与1,3-丙烷磺内酯在80℃下反应20 h,合成了4-乙烯基-1-(3-磺丙基)吡啶内嗡盐(4-VPPS);并在水溶液中与丙烯酰胺(AM)单体进行自由基共聚合,获得了同时含正负离子基团的磺酸甜菜碱两性离子共聚物P((AM-co-)); 采用红外光谱和1H-NMR对共聚物结构和组成进行了表征；进而考察了单体组成、引发剂用量、单体总浓度及反应温度对两性离子共聚物特性黏数的影响.通过考察单体投料比与共聚物组成的关系，利用FinemannRoss和Kelen-Tudos方法，获得AM和4-VPPS单体对的竞聚率分别为2.01、8.71和1.99、8.44.共聚物溶液性质研究结果表明，P(AM-co-VPPS)在…
In comparison with a previous crystallographic study [Goh et al. (2002 ▶). J. Solid State Chem.168, 119-125] of the title compound, silver diniobium tris-(disulfide) tetra-thio-phosphate(V), that reports a full occupation of the silver position and isotropic displacement parameters for the atoms, the current redetermi…
The relationship between the dark conductivity (σd) and temperature (T) of amorphous HgCdTe films has been investigated at 80-300 K. The measurement of σd as a function of T indicates the presence of four distinct regions: (I) For 250K≤T<300 K(3.3<1000/T≤4.0), σd is strongly increase with T increasing, the transport m…
一种新的含烷基取代的苯并菲侧基的“毛-棒”状（hairy-rod）梯形聚倍半硅氧烷（LPSQ）可以在空气-水界面形成稳定的单分子层，研究了温度、铺展溶剂和浓度对 π-A 等温曲线的影响.在适当的表面压下，以甲苯为铺展溶剂该单分子层可以被成功地转移至疏水的硅片或石英片上形成均一稳定的Y-型LB膜，其紫外吸收强度在几个月内均保持不变，说明该LB膜具有良好的稳定性，AFM图像表明其形成了均一致密的膜.通过偏振紫外光谱和荧光光谱研究了其面内各向异性，发现LPSQ的分子链采取了平行于拉膜方向的优先取向，最优取向因子S为0.42.
用巯基乙胺为链转移剂,过硫酸铵为引发剂合成了氨基封端的聚2-丙烯酰胺基-2-甲基丙磺酸（H2N-PAMPS）.再用1-（3-二甲氨基丙基）-3-乙基碳二亚胺盐酸盐（EDC）和N-羟基琥珀酰亚胺（NHS）在室温下催化H2N-PAMPS的端氨基与大豆分离蛋白（SPI）的羧基反应形成酰胺键,得到接枝物SPI-g-NH-PAMPS.用^1H-NMR、傅利叶红外光谱、^13C-NMR对H2N-PAMPS和接枝物SPI-g-NH-PAMPS进行结构表征.用zeta电位仪、紫外可见光光谱,荧光光谱,动态激光光散射对SPI及其接枝物SPI-g-NH-PAMPS的水溶液性质进行了研究.结果表明,与SPI相比,SPI-g-NH-PAMPS的溶解性、表…
A polystyrene-grafted polypropylene sample was prepared by solid-state grafting polymerization in the presence of 2,2,6,6-tetramethyl-piperidinyloxy. Temperature rising elution fractionation of the grafted PP was performed and the fractions were characterized by 1H- and 13C-NMR, FT-IR, GPC, DSC, and WAXD. Results show…
Absence of localization is demonstrated analytically to leading order in weak disorder in a one-dimensional Anderson model of a ring threaded by an Aharonov-Bohm (AB) flux. The result follows from adapting an earlier perturbation treatment of disorder in a superconducting ring subjected to an imaginary vector potentia…
采用无皂沉淀聚合法，在水溶液中通过 N-乙烯基己内酰胺(VCL)与一种单取代乙烯基 β-环糊精单体(GMA-EDA-β-CD)的共聚反应，合成出了含有 β-CD结构单元的温敏性VCL/GMA-EDA-β-CD共聚物微凝胶.用红外光谱仪(FTIR)、1H核磁共振仪(1H-NMR)、透射电镜(TEM)及激光粒度仪(DLS)对其结构、形态和性能进行了表征.研究结果表明， β-CD结构单元的加入使共聚物微凝胶的粒径减小，粒径分布变窄，但其温敏性降低.
通过紫外引发聚合方法制备了无机交联的聚(N-异丙基丙烯酰胺)(PNIPAAm)/有机交联的聚丙烯酰胺(PAAm)互穿网络(IPN)水凝胶.利用FTIR和SEM分别表征了凝胶的化学结构和内部形态；测定了凝胶在高温(50℃)时的退溶胀性能；利用DMA和DSC分别研究了凝胶的储能模量随温度的变化及热相转变行为.研究表明，该IPN凝胶具有温度敏感性；与未互穿的无机交联PNIPAAm凝胶相比，IPN凝胶具有多孔的网络结构和超快的响应速率，如10 min内失去90%的水；其储能模量增加了3～4倍，相转变行为变弱，而最低临界溶解温度(LCST)提高了1.4℃.
All clinically-approved and many novel gadolinium (Gd)-based contrast agents used to enhance signal intensity in magnetic resonance imaging (MRI) are optically silent. To verify MRI results, a "gold standard" that can map and quantify Gd down to the parts per million (ppm) levels is required. Nuclear microscopy is a r…
As one of widely used microlens fabrication techniques, thermal reflow method has many advantages such as simple fabrication process, low price, and good smoothness of the microlens. However, it is difficult to predict and control the final microlens contour after melting process. In this paper, we pay our attention o…