Ti含量对溶胶-凝胶法制备Ti、Ga共掺ZnO薄膜性能的影响

采用溶胶-凝胶旋涂法在玻璃衬底上沉积纳米结构Ti、Ga共掺ZnO薄膜(TGZO,Ga掺杂量为1.0;(原子分数,下同)),用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、分光光度计(UV-Vis)、四探针测试仪、霍尔效应测试仪研究了Ti含量对TGZO薄膜的物相组成、表面形貌、电学和光学性能的影响.结果表明:所有TGZO薄膜均表现出六方纤锌矿的多晶结构,并具有(002)择优取向生长,在380～780 nm波长范围内具有良好的透射率(>86;);随着Ti含量的增加,TGZO薄膜的晶粒尺寸和可见光平均透射率均先增加后减小,而光学带隙和电阻率先减小后增加;Ti掺杂量为1.0;时,具有最高的可见光透射率92.82;,最窄的光学带隙3.249 eV,以及最低电阻率2.544×10-3Ω·cm.     

基于物理中面FGM板屈曲的有限元分析

基于物理中面的概念,根据最小势能原理推导了功能梯度材料FGM薄板屈曲的有限元控制方程,求得临界荷载的有限元解。利用FGM板的屈曲方程与参考均匀板的屈曲方程之间的相似性,建立了FGM板的临界荷载与参考均匀板的临界荷载之间的相似转换关系式,从而将FGM板临界荷载的计算转变为参考均匀板的临界荷载和材料不均匀系数的计算,极大地提高了计算效率,为FGM的推广起积极的推动作用。通过数值算例,将由有限元法和转换关系式得到的临界荷载进行了比较,并讨论了边界条件、荷载工况、材料组成和几何尺寸等对FGM板临界荷载的影响。     

计算滴定分析法的分类及其进展

提出了将计算滴定分析法分为控制体积滴定法和控制电位滴定法两个大类的观点。控制体积滴定法包括线性滴定法、单点滴定法及双点滴定法;控制电位滴定法包括控制单电位滴定法和控制多电位滴定法。本文介绍了两类计算滴定分析法的基本原理、方法特点、相互联系、引起误差的原因及其最新进展。     

RP-HPLC测定野葛花中3种异黄酮

采用反相高效液相色谱法测定野葛花中3种异黄酮化合物葛花苷、次葛花苷及尼泊尔鸢尾异黄酮.色谱柱为ODS柱,以甲醇-1.0g/L柠檬酸水溶液为流动相,紫外检测波长为265 nm.3种异黄酮化合物线性范围均在0.02～0.2mg/mL,它们的平均回收率分别为99.90%,100.57%和99.80%（n=5）,RSD分别为0.79%,0.60%和0.70%（n=5）.     

Rational design of iridium–porphyrin conjugates for novel synergistic photodynamic and photothermal therapy anticancer agents

Near-infrared (NIR) emitters are important probes for biomedical applications. Nanoparticles (NPs) incorporating mono- and tetranuclear iridium(iii) complexes attached to a porphyrin core have been synthesized. They possess deep-red absorbance, long-wavelength excitation (635 nm) and NIR emission (720 nm). TD-DFT calculations demonstrate that the iridium–porphyrin conjugates herein combine the respective advantages of small organic molecules and transition metal complexes as photosensitizers (PSs): (i) the conjugates retain the long-wavelength excitation and NIR emission of porphyrin itself; (ii) the conjugates possess highly effective intersystem crossing (ISC) to obtain a considerably more long-lived triplet photoexcited state. These photoexcited states do not have the usual radiative behavior of phosphorescent Ir(iii) complexes, and they play a very important role in promoting the singlet oxygen (¹O₂) and heat generation required for photodynamic therapy (PDT) and photothermal therapy (PTT). The tetranuclear 4-Ir NPs exhibit high ¹O₂ generation ability, outstanding photothermal conversion efficiency (49.5%), good biocompatibility, low half-maximal inhibitory concentration (IC₅₀) (0.057 μM), excellent photothermal imaging and synergistic PDT and PTT under 635 nm laser irradiation. To our knowledge this is the first example of iridium–porphyrin conjugates as PSs for photothermal imaging-guided synergistic PDT and PTT treatment in vivo.

Iridium–porphyrin conjugates assembled in nanoparticles are photosensitizers that exhibit excellent photothermal imaging and synergistic PDT and PTT in vivo.     

Synthesis and characterization of new aromatic liquid crystalline polyesters having phenyl substituents

Two different series of new aromatic liquid crystalline (LC) polyesters were prepared from 3-phenyl-4, 4'-biphenyldicarboxylic acid (PBDA) and 1-phenyl-2, 6-naphthalenedicarboxylic acid (PNDA). PBDA and PNDA were polymerized with various aromatic diols such as hydroquinone, substituted hydroquinones, isomeric naphthalenediols and 4, 4'-biphenol, and the resulting polyesters were characterized by DSC, WAXD, and on a cross-polarizing microscope for the study of their thermal transition and crystallization properties, and mesophases formed therefrom.     

近红外荧光探针检测金属离子、小分子和生物大分子

荧光探针技术是近年来发展迅速的一种荧光分析方法,具有灵敏度高、选择性好、操作简便和响应迅速等特点,受到环境及生命科学领域的青睐.随着荧光探针技术的发展,近红外一区荧光探针由于具有发射波长长(600～ 900 nm)、对细胞损伤小、组织穿透性强和自发荧光背景低等优点,被广泛应用于细胞、组织等复杂生物体系中生物分子的检测、...     

不同生境半夏及炮制半夏中鸟嘌呤核苷的含量测定

采用反相高效液相色谱法测定不同生境半夏和炮制半夏中鸟嘌呤核苷的含量.不同生境的半夏中鸟嘌呤核苷的含量并无差异,但炮制半夏中鸟嘌呤核苷含量较生品均有不同幅度下降.从水溶性成分鸟嘌呤核苷的含量看,种植半夏质量并不比野生半夏质量差;半夏在炮制过程中水溶性成分有所损失.     

A periodic DFT study on adsorption of small molecules(CH_4,CO,H_2O,H_2S,NH_3)on the WO_3(001) surface-supported Au

Gas molecules(such as CH4,CO,H2O,H2S,NH_3)adsorption on the pure and Au-doped WO3(001)surface have been studied by Density functional theory calculations with generalized gradient approximation.Based on the the calculation of adsorption energy,we found the most stable adsorption site for gas molecules by comparing the adsorption energies of different gas molecules on the WO3(001)surface.We have also compared the adsorption energy of five different gas molecules on the WO3(001)surface,our calculation results show that when the five kinds of gases are adsorbed on the pure WO3(001)surface,the order of the surface adsorption energy is CO>H2S>CH4>H2O>NH3.And the results show that NH3 is the most easily adsorbed gas among the other four gases adsorbed on the surface of pure WO3(001)surface.We also calculated the five different gases on the Au-doped WO3(001)surface.The order of adsorption energy was found to be different from the previous calculation:CO>CH4>H2S>H2O>NH3.These results provide a new route for the potential applications of Au-doped WO3 in gas molecules adsorption.     

CaLuBO4∶Tb^3+荧光粉的制备及发光性质

采用高温固相反应法合成了不同Tb^3+掺杂浓度的CaLuBO4∶xTb^3+荧光粉,研究了样品的晶体结构和发光性质。在紫外光激发下,样品的发射光谱由Tb3+离子的5D3→7FJ(J=6,5,4)和5D4→7FJ′(J′=6,5,4,3)特征发射组成,其中位于545 nm和554 nm附近的5D4→7F5跃迁发射强度最大。荧光粉的激发光谱是由位于紫外区的Tb3+的4f-5d和f-f跃迁构成的。研究了Tb3+浓度对样品发光性质的影响。测量并分析了CaLuBO4∶xTb^3+荧光粉的5D3能级和5D4能级荧光寿命。结果表明,CaLuBO4∶xTb^3+是一种适于紫外激发的新型黄绿光荧光粉。