准完全带隙胶体非晶光子晶体

三维面心立方结构的固有的高对称性使其只具备非完全光子带隙,而非晶结构可降低对称性导致准完全光子带隙的出现.实验结果表明非晶胶状晶体具有准完全光子带隙.非晶胶状光子晶体中的光子带隙的禁带宽度与波长均不随光入射到样品池的角度的变化而明显变化.其禁带宽度比SiO₂小球面心单晶的禁带宽度宽得多 关键词： 光子带隙 非晶 光谱     

Crystal thickness and sphere dispersion dependence of the photonic band gap of silica colloidal crystals

Experimental results demonstrate that the band gap of colloidal suspension crystal changes with both the thickness of crystal and the dispersity of micro-spheres.As the thickness decreases,a red shift of band gap is observed,and there is a maximum of red shift.The values of the maximum red shifts are dependent on the standard deviations of micro-spheres.The experimental results are consistent with theoretical calculation.As the colloidal suspension crystal is assembled from micro-spheres with a standard deviation of 8.4% in a thick cell,an incident angles independent broadband is observed,which is explained as an amorphous structure.Two amorphous models are discussed.     

Synthesis and Crystal Structure of 2-(2-Ethyl-1H-imidazol-1-yl)-1-hydroxy-ethane-1,1-diyldiphosphonic Acid (EIHDP)

The crystal structure of the title compound (C7H14N2O7P2, Mr = 300.14) was determined by single-crystal X-ray diffraction. The crystal belongs to triclinic, space group P1 with a = 8.258(3), b = 8.886(3), c = 9.275(3) , α = 96.669(3), β = 115.706(3), γ = 104.467(3)°, V = 573.8(3) 3, Z = 2, Dc = 1.737 g/cm3, λ(MoKα) = 0.71073, F(000) = 720, μ(MoKα) = 0.41 mm-1, R = 0.030 and wR = 0.078. A total of 1970 unique reflections were collected, of which 1742 with I > 2σ(I) were observed. EIDHP has a structure similar to zoledronic acid (ZL). ZL is a potent bone antiresorptive bisphosphonate drug having significant activity against several parasitic protozoa. EIHDP has inner-salt character, consisting of a negatively charged PO3 group and a positively char- ged N(1) atom. The crystal structure is stabilized by intermolecular hydrogen bonds of O–H···O and N–H···O.     

Crystal thickness and sphere dispersion dependence of the photonic band gap of silica colloidal crystals

Experimental results demonstrate that the band gap of colloidal suspension crystal changes with both the thickness of crystal and the dispersity of micro-spheres. As the thickness decreases, a red shift of band gap is observed, and there is a maximum of red shift. The values of the maximum red shifts are dependent on the standard deviations of micro-spheres. The experimental results are consistent with theoretical calculation. As the colloidal suspension crystal is assembled from micro-spheres with a standard deviation of 8.4% in a thick cell, an incident angles independent broadband is observed, which is explained as an amorphous structure. Two amorphous models are discussed.     

5-(N-2-羟乙基)羟乙酰氨基-N,N'-双(2,3-二羟丙基)-2,4,6-三碘-1,3-苯二甲酰胺的合成

5-氨基-N,N'-双(2,3-二羟丙基)-2,4,6-三碘-1,3-苯二甲酰胺(2)在N,N-二甲基乙酰胺中可直接与乙酰氧基乙酰氯反应, 产物再经碱性水解得5-羟乙酰氨基-N,N'-双(2,3-二羟丙基)-2,4,6-三碘-1,3-苯二甲酰胺(3), 后者再与氯乙醇反应生成5-(N-2-羟乙基)羟乙酰胺基-N,N'-双(2,3-二羟丙基)-2,4,6-三碘-1,3-苯二甲酰胺(1), 经乙二醇甲醚/正丁醇重结晶, 纯度高于99% (HPLC), 反应总收率由39.3% (文献值)提高到55.1%.     

纳米TiO2光生超亲水性研究进展

纳米TiO2作为光催化环境材料能有效地降解多种对环境有害的污染物,使有害物矿化为CO2、H2O及其他无机小分子物质,因此可用于废水处理,空气净化以及杀菌除臭。本文综述了纳米级TiO2的制备及其光生超亲水性的机理,扼要介绍了纳米级TiO2光生超亲水性在自清洁建材、杀菌消毒等方面的研究进展及应用前景。     

Mechanism of Low Threshold Lasing of Dye Solution Embedding in Nanoparticle Fractal Aggregates

We study the single-photon and two-photon induced emission properties of dye solution embedded with nanoparticle fractal aggreagates.The spectral and temporal experimental results show that the lasing threshold of single photon absorption of a neat dye solution;while that of two-photon absorption does not.These experimental results imply that this low threshold single-photon absorption lasing mainly results from the mechanism of random walking,instead of Anderson localization.unless somthing about two-photon induced emission is unknown.     

碘量法测定因卡膦酸二钠中的亚磷酸盐

因卡膦酸二钠(Incadronate,YM175,1),化学名环庚胺基甲撑二膦酸二钠一水合物,是第三代二膦酸盐,1997年于日本上市,适应症为恶性肿瘤并发的高钙血症[1]。国内应用于恶性肿瘤骨转移疼痛的治疗,疗效显著[2,3]。该药的生产中使用了亚磷酸二乙酯作为起始原料[1],其水解生成亚磷酸盐,原料药质量标准需要控制亚磷酸盐的含量,以确保用药安全。本文根据亚磷酸盐具有还原性,设计在中性条件下,冰浴中用过量碘与亚磷酸盐充分反应,再用硫代硫酸钠滴定液返滴定过量的碘,淀粉指示液确定滴定终点。该测定方法已列入因卡膦酸二钠新药质量试行标准。1试验部…     

甾醇、甾烷醇柱前衍生高效液相荧光分析

采用荧光衍生化试剂2-(9-咔唑)乙酰氯,对天然产物谷甾醇、豆甾醇、菜油甾醇及谷甾烷醇的柱前衍生化条件,包括催化剂的种类、反应温度、衍生化时间等进行了考察,结果表明催化剂选用三乙胺,反应温度80℃,时间20 min,衍生产物具有恒定的最大检测响应值.利用高效液相色谱对衍生产物进行分析,并对衍生物的分离进行了优化选择,达到了较好的基线分离,检出限为12.6～29.5 nmol/L.方法应用于血清样品的测定,谷甾醇、豆甾醇、菜油甾醇和谷甾烷醇的标准加入回收率分别为101.9%、102.4%、101.0%和103.2%.     

1-羟基-2-(1-甲基咪唑-2-基)乙烷-1,1-双膦酸的合成

自从Fleisch等入[1]发现双膦酸盐类化合物的亲骨作用以来,双膦酸盐化合物逐渐成为治疗骨骼方面疾病的药物,包括骨质疏松症,肿瘤病并发的高钙血症和骨痛,变形性骨炎(Paget’s病)和多发性骨髓瘤[2-3]。目前以唑来膦酸[化学名为2-(2-甲基-咪唑-1-基)-1-羟基乙烷-1,1-双膦酸]综合疗