The Preparation and Crystal Structure of TlMnCl3, TlFeCl3, TlCoCl3 and TlNiCl3

The compounds TlMnCl₃, TlFeCl₃, TlCoCl₃ and TlNiCl₃ were prepared by heating T1C1 with the corresponding transition metal dichloride in an evacuated ampoule. Atomic positions were determined from powder photographs. All four compounds were found to be related to the perovskite type structure. TlMnCl₃ has a cubic structure, space group Pm3m, with a_o = 5.025 Å. The other three compounds are hexagonal, probable space group P6₃mc, with cell dimensions (in Å) a₀ = 6.976 and c₀ = 6.008 for the Fe compound, a₀ = 6.907 and c₀ = 5.981 for the Co compound and a₀ = 6.863 and c₀ = 5.881 for the Ni compound. The three hexagonal compounds are isomorphous. A measureable concentration of basal plane stacking faults was found to occur in TlFeCl₃ and also, to a lesser degree, in TlCoCl_3.     

3-硝酸酯甲基-3-乙基氧杂环丁烷的合成及表征

以三羟甲基丙烷和碳酸二乙酯为原料,经环化、硝化两步反应合成出了3-硝酸酯甲基-3-乙基氧杂环丁烷(NIMEO),硝化反应的收率为75.1％,产品质量分数为98.8％.通过红外光谱、核磁共振氢谱及元素分析对产品的结构进行了表征,表明为目标化合物.考察了反应条件对产品收率的影响,确定了最佳的硝化条件:硝酸/醋酐为硝化剂,硝...     

Preparation and Crystal Structure of KFeCl3 and KFeBr3

The preparation and crystal structures of anhydrous KFeCl₃ and KFeBr₃ are described. X-ray diffraction data obtained at room temperature indicate that the two compounds belong to the orthorhombic system, space group Pnma and z = 4. Unit cell parameters are a = 8.712 Å, b = 3.845 Å, c = 14.15 Å for KFeCl₃ and a = 9.220 Å, b = 4.026 Å, c = 14.899 Å for KFeBr₃. Atomic positions were determined.     

3-芳基丙烯酸及其酯的合成

研究了以无水碳酸钾作催化剂 ,芳香醛与酸酐反应合成 3 芳基丙烯酸 ,用对甲苯磺酸催化酯化反应合成 3 芳基丙烯酸酯。产品结构经1HNMR、IR和元素分析证明与预期结构相符。     

3-叠氮甲基-3-乙基氧杂环丁烷及其均聚物的合成与性能

为开发新型含能黏合剂，以三羟甲基丙烷、碳酸二乙酯、对甲苯磺酰氯、叠氮化钠为原料，合成出一种新型叠氮类氧杂环单体3-叠氮甲基-3-乙基氧杂环丁烷（AMEO）。用核磁、红外、元素分析和DSC表征了AMEO的结构与性能。以1，4-丁二醇为起始剂，三氟化硼乙醚络合物为催化剂，二氯甲烷为溶剂，AMMO为单体，借助于阳离子开环聚合，合成出聚3-叠氮甲基-3-乙基氧杂环丁烷（PAMEO）。用红外光谱、核磁共振、元素分析、羟值、数均分子质量表征和测定了聚合物的结构和性能。     

Fluorescence spectra of Eu3 , Tb3 , Dy3 and Ho3 doped certain powder phosphors

This paper reports the photoluminescence spectral properties of Eu³⁺, Tb³⁺, Dy³⁺ and Ho³⁺ doped LaOX, YOX, (La, Gd)OX, and (La, Y)OX (X=F, Cl) powder phosphors. Under the UV-light these phosphors have exhibited bright reddish-orange, green, yellowish-blue and bluish-green colours. This papers also describes the effects of the halides change in the host material chosen specifically.     

Differences in the phospholipid,cholesterol, and fatty acyl composition of 3T3 and SV3T3 plasma membranes

An analysis of the phospholipid, cholesterol, and phospholipid fatty acyl composition of isolated plasma membranes of 3T3 and SV3T3 mouse embryo cells has been performed. The results show that the plasma membrane of SV3T3 cells contain relatively less phosphatidylethanolamine and sphingomyelin and more cholesterol than 3T3 plasma membranes. The fatty acyl composition of individual phospholipid classes as determined by gas liquid chromatography also showed differences between 3T3 and SV3T3 plasma membranes. The plasma membranes of SV40 transformed 3T3 cells contain: (a) a higher percentage of 18∶1 and less 20∶3 and 20∶4 in phosphatidylethanolamine; (b) a higher percentage of 18∶1 in phosphatidylserine; and (c) a higher percentage of 18∶2 and 20∶4 in phosphatidylinositol.     

钙钛矿型LaFeO3和SrFeO3的光催化性能

采用柠檬酸法合成钙钛矿型复合氧化物LaFeO3和SrFeO3,并以其为光催化剂对不同水溶性染料进行光催化降解实验.结果表明:SrFeO3的光催化活性明显高于LaFeO3,这与A位离子(La3+,Sr2+)的电子构型的不同有关.     

甲胺铅碘钙钛矿物性及制备过程的分子模拟

应用分子动力学方法分析了甲胺铅碘晶体的结构特征与机械性质等相关物性,模拟了用蒸气沉积法在TiO₂基底上制备甲胺铅碘晶体的过程,探讨了生成的PbI₄^2-、PbI₅^3-和PbI₄^6-多面体的排布方式,结合周围CH₃NH₃⁺的分布筛选出满足结构要求的初生晶核,分析了前驱盐配比对甲胺铅碘初生晶核产量的影响。结果表明,在拉伸过程中,甲胺铅碘晶体经历弹性形变、塑性形变以及断裂三个阶段,拟合计算得到的弹性模量与实验值符合较好;大部分初生晶核以PbI₅^3-金字塔的结构存在。前驱盐配比对各系统中PbI_x多面体的总含量影响较小,但对其中排布有效的PbI_x结构以及初生晶核的产量影响较大,二者产量随着配比PbI₂∶CH₃NH₃I的增加而迅速减小,这一关系与研究者发现的实验现象相符。     

Nucleophilic substitution reactions on 3-bromo- and 3-nitrobenzanthrones

Nucleophilic substitution reactions of 3-bromobenzanthrone and 3-nitrobenzanthrone have been studied. Reaction of 3-bromobenzanthrone with different arylamines gave rise to 6-arylamino-3-bromobenzanthrones. Anomalous behaviour was observed with 2-aminobenzothiazole, when the bromine atom underwent displacement, and with thiourea, when 3-mercaptobenzanthrone was obtained. Reactions of 3-nitrobenzanthrone, on the other hand, gave rise to 4-substituted amino derivatives.     

Thermal analyses of poly(3-hydroxybutyrate), poly(3-hydroxybutyrate-co-3-hydroxyvalerate), and poly(3-hydroxybutyrate-co-3-hydroxyhexanoate)

Thermal analyses of poly(3-hydroxybutyrate) (PHB), poly(3-hydroxybutyrate-co-3-hydroxyvalerate) [P(HB–HV)], and poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) [P(HB–HHx)] were made with thermogravimetry and differential scanning calorimetry (DSC). In the thermal degradation of PHB, the onset of weight loss occurred at the temperature (°C) given by T_o = 0.75B + 311, where B represents the heating rate (°C/min). The temperature at which the weight-loss rate was at a maximum was T_p = 0.91B + 320, and the temperature at which degradation was completed was T_f = 1.00B + 325. In the thermal degradation of P(HB–HV) (70:30), T_o = 0.96B + 308, T_p = 0.99B + 320, and T_f = 1.09B + 325. In the thermal degradation of P(HB–HHx) (85:15), T_o = 1.11B + 305, T_p = 1.10B + 319, and T_f = 1.16B + 325. The derivative thermogravimetry curves of PHB, P(HB–HV), and P(HB–HHx) confirmed only one weight-loss step change. The incorporation of 30 mol % 3-hydroxyvalerate (HV) and 15 mol % 3-hydroxyhexanoate (HHx) components into the polyester increased the various thermal temperatures T_o, T_p, and T_f relative to those of PHB by 3–12°C (measured at B = 40°C/min). DSC measurements showed that the incorporation of HV and HHx decreased the melting temperature relative to that of PHB by 70°C. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 82: 90–98, 2001     

D-氨基葡萄糖与硝酸铕、铽配合物的合成及光谱分析

用D-氨基葡萄糖盐酸盐分别与硝酸铕和硝酸铽反应,制备了氨基葡萄糖-铕、氨基葡萄糖-铽两种配合物,并研究了配合物的红外光谱、紫外光谱和X射线光电子能谱(XPS)。配合物紫外的λmax发生了明显紫移,在远IR区Glu-Eu配合物中出现的新的吸收峰206 cm-1和254 cm-1可分别归属于νEu-O和νEu-N,在Glu-Tb配合物中出现的新的吸收峰203 cm-1和252 cm-1可分别归属于νTb-O和νTb-N,XPS表明氨基葡萄糖-Ln中氨基葡萄糖的N和O原子上的电子云密度减少,孤对电子转移,稀土离子得到电子。     

Synthesis of some cobalt phthalocyanine-3 3 3 3-tetrasulphonamides and spectroscopic studies of their application to cellulosic fibres

The treatment of cobalt phthalocyanine-3, 3′, 3″, 3′″-tetrasulphonylchloride with different primary amines with different substituents has given eight novel cobalt phthalocyanine-3, 3′, 3″, 3′″-tetrasulphonamide compounds. The structure determination have been carried out using elemental analysis, molecular weight measurements and infra-red spectroscopy. Direct application of the new synthesised dyes to cotton and viscose fabrics at two different bath concentrations gave a range of percentage reflectances values in the visible region. The absorption maxima appeared in both cases in the range 670–680 nm.     

Luminescent Dy3+ and Dy3+/Cr3+ doped transparent Al2O3 ceramics: Microstructure and optical properties

Highly transparent Dy³⁺ and Dy³⁺/Cr³⁺ polycrystalline alumina ceramics were prepared with the real in-line transmittance (RIT) up to 55% (at λ = 632 nm), one of the highest values reported for luminescent rare-earth elements doped alumina. The RIT of doped alumina decreased more sharply with increasing mean grain size than predicted by the models for pure alumina. Co-doping with Dy³⁺ and Cr³⁺ resulted in a moderate increase of the RIT, which was independent on grain size. EDX analysis revealed that dysprosium segregated at grain boundaries and chromium was dispersed throughout the alumina matrix. A thermodynamic model for diffusion of multiple species in systems with multiple sorts of traps was proposed. The photoluminescence excitation and emission spectra of Dy³⁺-doped alumina showed peaks characteristic for Dy³⁺-doped materials. In co-doped Dy³⁺/Cr³⁺ alumina, Dy³⁺ emitted in the blue and yellow regions and Cr³⁺ in the red region, creating a suitable combination for obtaining white light.     

Low thermal conductivity of SrTiO3−LaTiO3 and SrTiO3−SrNbO3 thermoelectric oxide solid solutions

Electron-doped SrTiO₃ has been attracting attention as oxide thermoelectric materials, which can convert wasted heat into electricity. The power factor of the electron-doped SrTiO₃, including SrTiO₃-LaTiO₃ and SrTiO₃-SrNbO₃ solid solutions, has been clarified. However, their thermal conductivity (κ) has not been clearly identified thus far. Only a high κ (>12 W m⁻¹ K⁻¹) has been assumed from the electron contribution based on Wiedemann–Franz law. Here, we show that the κ of the electron-doped SrTiO₃ is lower than the assumed κ, and its highest ZT exceeded 0.1 at room temperature. The κ slightly decreased with the carrier concentration (n) when n is below 4 × 10²¹ cm⁻³. In the case of SrTiO₃-SrNbO₃ solid solutions, an upturn in κ was observed when n exceeds 4 × 10²¹ cm⁻³ due to the contribution of conduction electron to the κ. On the other hand, κ decreased in the case of SrTiO₃-LaTiO₃ solid solutions probably due to the lattice distortion, which scatters both electrons and phonons. The highest ZT was 0.11 around n = 1 × 10²¹ cm⁻³. These findings would be useful for the future design of electron-doped SrTiO₃-based thermoelectric materials.     

3D打印多通道微反应器用于萃取分离In3+和Fe3+

将微流体萃取技术与新兴的3D打印技术相结合，设计并制造了一种结构较为复杂的多通道微流体萃取反应器，通过在微反应器内增加混合反应通道的数目来放大其处理量，以期使3D打印多通道微反应器在能够继承微流体单级萃取效率高优点的同时，也能够极大地扩大其处理量。反应器的结构特征主要包括两相入口、液滴筛板、混合萃取通道、混合液汇集腔及混合液出口等。将此种反应器用于不同初始条件下从硫酸溶液中萃取和分离In³⁺和Fe³⁺的实验，结果表明：随着两相接触时间的增长，萃取剂P204对于金属离子的萃取率呈现出先减小，再增大的趋势；溶液中In³⁺和Fe³⁺的分离系数在pH为0.7、接触时间为90s、萃取剂体积分数为30%时，达到最高值381.9。对初始溶液pH、萃取剂在油相中的体积分数、两相的接触时间等单因素对In³⁺和Fe³⁺的萃取率和分离系数的影响作了详细调查。     

Luminescence from γ- and β-irradiated HDPE and LLDPE

The luminescence of polyethylene (high density polyethylene (HDPE) and linear low density polyethylene (LLDPE)) induced by ionising irradiation has been studied. The effects of filling materials, irradiation dose and dose rate on the luminescence have been investigated. For freshly irradiated samples, both unfilled and filled, the luminescence was concluded to consist predominantly of thermoluminescence (TL). Upon subsequent ageing, the contribution of TL was found to decrease due to its decay with time after irradiation. Light emission was found to increase in the later stages of ageing, for irradiated and also for un-irradiated samples. This light was interpreted as chemiluminescence (CL), emitted as a result of polymer oxidation. The maximum of the CL was higher for irradiated than for unirradiated polyethylene, indicating that the ionising radiation gave rise to an increased amount of oxidation products. Thus, CL has been shown to be a feasible technique in studies of radiation-induced oxidation. © of SCI.     

3-叠氮甲基-3-硝酸酯甲基氧丁环及其聚合物的合成及其性能

以2，2-二溴甲基-1，3-丙二醇为基础原料，经关环、取代、硝化三步反应合成3-叠氮甲基-3-硝酸酯甲基氧丁环(AMNMO),后者经阳离子开环聚合，制备出液态高能粘合剂PolyAMNMO，探讨了用作推进剂增塑剂、粘合剂的可能性。     

Enhanced luminescence properties and energy transfer in Ce3+ and Tb3+ co-doped NaCaBO3 phosphor

A series of color-tunable NaCaBO₃: Ce³⁺, Tb³⁺ phosphors have been synthesized on the basis of efficient Ce³⁺→Tb³⁺ energy transfer. The photoluminescence emission and excitation spectra, the lifetime, and the effect of Tb³⁺ concentration are investigated in detail. The enhanced photoluminescence of Tb³⁺ with sharp emission lines could be obtained by the broad excitation band from the allowed 4f–5d absorption of Ce³⁺ ions. The intensity ratio of blue emission from Ce³⁺ and green emission from Tb³⁺ can be tuned by adjusting their concentrations. The energy transfer from Ce³⁺ to Tb³⁺ in NaCaBO₃ was found to be an electric dipole–quadrupole interaction.