高分辨热敏微胶囊信息材料及其影像特性

利用界面聚合法制备了亚微米级染料前体微胶囊和显色剂微胶囊,探讨了显影条件、囊壁材料用量与影像密度之间的关系．分析表明显影温度、显影时间、囊壁材料用量共同影响影像密度,显影温度决定了囊壁的渗透能力,显影时间决定了显色反应程度,而囊壁材料用量决定了囊壁厚度进而影响影像密度．得到最佳显影温度区间为130℃-140℃,最佳显影时间为5s．     

交联聚乳酸中空微球的制备与表征

由于聚乳酸具有良好生物相容性与降解性,故可用作控释给药系统的载体材料．有关聚乳酸及其共聚物微球药物载体、释放行为及微球表面引入基团使之功能化的方法研究已有报道．以其它生物大分子材料作为囊壁材料的缓释微胶囊也有报道,但以聚乳酸制备中空微囊型的药物释放载体却鲜有研究．通过控制分子量、微囊大小、囊壁厚度等参数,     

三聚氰胺-甲醛树脂包裹环氧树脂微胶囊的制备及表征

针对环氧树脂基材料的自修复,选取四氢邻苯二甲酸二缩水甘油酯作为芯材,采用三聚氰胺-甲醛树脂为壁材,对其进行微胶囊化包裹.结果表明,制得的具有单囊结构的环氧树脂微胶囊,胶囊粒径较小(约6.7μm)、囊壁较薄(约0.2μm)、芯含量较高(83.2 wt%),囊壁内、外表面光滑致密,胶囊具有良好的密闭性和耐热性;在微胶囊化过程中,三聚氰胺-甲醛树脂的缩聚反应动力学起关键作用,芯材没有参与囊壁形成的交联反应;包裹后的芯材活性保持不变,胶囊被复合到材料过程中囊芯活性也保持不变;胶囊的强度较高,能承受与基体材料复合过程中的外力作用,且与基体材料间粘结良好,在裂纹形成过程中能够随基体同时开裂.     

界面聚合法制备正二十烷微胶囊化相变储热材料

采用界面聚合的方法, 以甲苯鄄2,4-二异氰酸酯(TDI)和乙二胺(EDA)为反应单体, 非离子表面活性剂聚乙二醇壬基苯基醚(OP)为乳化剂, 合成了正二十烷为相变材料的聚脲包覆微胶囊. 结果表明, 二异氰酸酯和乙二胺按质量比1.9:1 进行反应. 以透射电镜和激光粒度分析仪分析微胶囊, 测得空心微胶囊直径约为0.2 μm, 含正二十烷微胶囊约为2-6 μm. 红外光谱分析证明, 壁材料聚脲是由TDI 及EDA 两种单体形成的. 正二十烷的包裹效率约为75%. 微胶囊的熔点接近囊芯二十烷的熔点, 而其储热量在壁材固定时随囊芯的量而变. 热重分析表明, 囊芯正二十烷、含正二十烷的微胶囊以及壁材料聚脲, 能够耐受的温度分别约为130 ℃、170 ℃及270 ℃.     

界面聚合法制备正二十烷微胶囊化相变储热材料

用界面聚合的方法,以甲苯-2,4-二异氰酸酯(TDI)和己二胺(HDA)为反应单体,非离子表面活性剂聚乙二醇壬基苯基醚(OP)为乳化剂,合成了正二十烷为相变材料的聚脲包覆微胶囊. 结果表明,二异氰酸酯和己二胺按质量比为1.5∶ 0.8进行反应. 空心微胶囊的直径约为0.2 μm,含正二十烷微胶囊直径为2~6 μm. 红外光谱分析证明, 囊壁聚脲是由TDI及HDA 2种单体形成. 正二十烷包裹效率为65%~80%. 微胶囊的熔点接近囊芯正二十烷的熔点,而其储热量在壁材固定时随囊芯的量而变. 热重分析结果表明,囊芯正二十烷、含正二十烷的微胶囊以及壁材聚脲,能够耐受的温度分别约为130、165及250 ℃.     

生物农药微胶囊壁材料研究

用原位聚合法对生物农药阿维菌素进行包囊,然后制备微胶囊制剂,并对用于该制剂的两种高分子囊壁材料-三聚氰胺甲醛树脂和脲醛树脂的性能进行了研究。结果表明,两种树脂皆为较好的生物农药用微胶囊缓释剂型的囊壁材料,其制备工艺简单,具有良好的稳定性、粒径大小与分布、悬浮性、缓释性等,包封率均达80％以上。其中三聚氰胺甲醛树脂悬浮性较脲醛树脂更好,缓释性更持久。     

丙烯酸共聚物囊壁的正十八烷微胶囊的制备和性能表征

以二丙烯酸1,4-丁二醇酯为交联剂, 成功制备了甲基丙烯酸甲酯-甲基丙烯酸共聚物为壁材, 正十八烷为囊芯的相变材料微胶囊. 采用扫描电子显微镜(SEM)、差示扫描量热仪(DSC)和热重分析仪(TG)分别考察了单体与芯材投料比、单体浓度和交联剂的含量对微胶囊形貌、相变热性能、热稳定性能的影响. 实验结果表明: 随着单体与芯材投料比或单体浓度的增加, 微胶囊表面均变得致密, 壁厚增加; 随着交联剂含量的增加, 微胶囊的表面变得更加致密光滑, 热稳定性显著增强; 随着单体与芯材投料比的增大, 微胶囊热焓值减小, 被包裹的囊芯含量减少.     

Nb-MCM-41硅基中孔分子筛的合成与表征

ＭＣＭ４１中孔分子筛在催化、吸附分离、离子交换以及无机材料等领域具有较高的工程应用与研究价值．近年来,在催化应用方面,将具有一定催化活性的过渡金属元素如Ｔｉ［１］、Ｚｒ［２］、Ｍｏ［３］、Ｖ［４］、Ｆｅ［５］、Ｍｎ［６］、Ｗ［７］等以高分散的形态嵌入分子筛骨架结构中,得到了许多具有催化氧化性能的新型催化剂．这些新型催化剂已在石油加工、精细化学品和有机中间体的制备等方面显示出良好的应用前景［８］．铌的化合物是目前引人注目的一种新型催化材料,因为具有酸活性中心及氧化还原功能,已应用于烯烃齐聚［９］…     

微胶囊化颜料粒子表面形貌的模式识别及量化表征

材料粒子的微胶囊化可提高材料的某些耐性［'j．群青颜料色泽鲜艳，但不耐酸，对群g粒子进行微胶囊化可改善其耐酸性．但由于相应粒子表面形貌不同，难以辩别与描述．本方使民计算机图像处理［'屿模式识别技术［'j，并用表面分形维数量化表征粒子的表面形貌［'j．1实验部分以群青粒子为芯材、以Na。SIO。与NH。CI水解产物硅胶为膜材，进行粒子的微胶囊化．将改变乳化剂浓度、搅拌速率两系列微胶囊化样品及原样采用JFY－ABI型测色计进行耐酸性色差（凸E）测试．粒子的表面形貌在X－650型扫描电子显微镜（配图像分析仪）下，经过数S化…     

纳米SnO2的制备

ＳｎＯ２在陶瓷、气敏半导体材料及催化剂等方面被广泛应用［１］．纳米级的ＳｎＯ２因具有明显的表面效应而受到关注，其制备方法也受到重视［２］．纳米ＳｎＯ２的制备方法较多，有沉淀法［２］、水热法［３，４］、溶胶－凝胶法［５］、火焰合成法［６］等．然而要制备...     

八羧基铜酞菁修饰海藻酸钠阳膜层制备CuPc(COOH)8-SA/mCS双极膜及其表征

在海藻酸钠(SA)中添加八羧基铜酞菁(CuPc(COOH)₈),并分别用Fe³⁺离子和戊二醛作为交联剂对海藻酸钠-八羧基铜酞菁阳膜层和壳聚糖(CS)阴膜层进行改性,制备了八羧基铜酞菁-海藻酸钠/改性壳聚糖双极膜(CuPc(COOH)₈-SA/mCS BPM)。在海藻酸钠中添加八羧基铜酞菁以促进中间层中水的解离。用FTIR、SEM等对制备的CuPc(COOH)₈-SA/mCS双极膜进行了表征。作为比对,制备了Fe³⁺离子改性的Fe-SA/mCS双极膜和二茂铁(Fc)离子改性的Fc-SA/mCS双极膜。实验结果表明,CuPc(COOH)₈-SA阳离子交换膜的离子交换容量、H⁺离子透过率均获得提高。与Fe³⁺离子改性或二茂铁离子改性的mSA/mCS双极膜相比,CuPc(COOH)₈-SA/mCS双极膜的阻抗、电阻压降(IR降)和溶胀度降低,在H+离子浓度低于8 mol·L^-1的酸溶液中具有稳定的工作性能。     

酞菁铜溶解性研究及其电沉积薄膜的制备

通过测定α-酞菁铜(α-CuPc)在4种不同的有机溶剂中的紫外可见光吸收光谱,研究了不同溶剂以及加入不同量的三氟乙酸(TFAA)对酞菁铜溶解性和质子化的影响.以溶解性研究为基础,探讨了在电化学沉积法制备酞菁铜薄膜时不同工艺条件对其形貌的影响.实验结果表明:加入TFAA后,酞菁铜在硝基甲烷和氯仿中溶解良好,而且在氯仿中更容易质子化;使用扫描电镜(SEM)表征,结果表明TFAA及酞菁铜摩尔含量对薄膜制备的影响最为明显.     

Adsorption and assembly of copper phthalocyanine on cross-linked TiO2(110)-(1 x 2) and TiO2(210)

Copper phthalocyanine (CuPc) on reconstructed rutile TiO(2) was studied with ultrahigh vacuum variable temperature scanning tunneling microscopy. On cross-linked TiO(2)(110)-(1 x 2), the CuPc molecules at low coverages sparsely lay flat at the link sites and tilted in troughs between [001] rows. Increase of the CuPc coverage led to the trapping of the CuPc molecules by the rectangular surface cells fenced by the oxygen columns along the [001] direction and the cross-link rows. Each cell could trap one CuPc molecule at intermediate coverages and two CuPc molecules at higher coverages. On TiO(2)(210), the CuPc molecules tilted in defect-free areas and lay at defect sites with their molecular planes parallel to the substrate surface. Further increase of the CuPc coverage induced the formation of one- and two-dimensional assemblies on TiO(2)(210).     

Dissolution of copper phthalocyanine and fabrication of its nano-structure film

The mono-protonated and di-protonated forms of copper phthalocyanine (CuPc) were obtained by increasing concentrations of trifluoroacetic acid (TFA) solution to a fixed concentration of CuPc solutions. UV-Vis spectrum shows that the Q bands of these two derivatives split and shift to the red, which means successive protonation happened and caused the two derivatives to lose their symmetry. After the protonation step, the solubility of protonated CuPc in organic solvent increased 60 times. The CuPc film was fabricated by the electrophoretic deposition (EPD) method from the protonated CuPc dissolved in nitromethane containing TFA. Scanning electron microscopy (SEM) showed that the deposited CuPc film on the indium tin oxide (ITO) substrate is composed of thread-like nanobelts with diameters between 100 nm and 200 nm. Furthermore, the CuPc film is in α phase with stacking direction (b-axis) parallel to the substrate, which was detected by X-ray diffraction.     

非手性的酞菁铜分子在Bi(111)表面上的手性特征

利用低温扫描隧道显微镜（LT-STM）研究了酞菁铜（CuPc）分子在Bi（111）表面上的吸附和手性自组装结构。由于较弱的分子-衬底相互作用,我们发现在液氮温度（78 K）下吸附在Bi（111）表面上的单个CuPc分子围绕着分子中心发生旋转,直到遇到其他分子形成团簇为止。随着分子覆盖度的增加,CuPc分子形成了自组装分子单层。高分辨STM图表明,非手性的CuPc分子出现了手性特征：两个相对的酞菁基团发生了弯曲。当覆盖度超过一个分子层,酞菁铜分子的吸附取向由“平躺”转变到“站立”姿态。我们认为,酞菁铜分子的手性起源是由两种因素共同导致的结果：一种是分子-衬底之间的非对称电荷转移,另一种是相邻分子间的非对称性的范德华力作用。     

Properties of copper (fluoro-)phthalocyanine layers deposited on epitaxial graphene

We investigate the atomic structure and electronic properties of monolayers of copper phthalocyanines (CuPc) deposited on epitaxial graphene substrate. We focus in particular on hexadecafluorophthalocyanine (F(16)CuPc), using both theoretical and experimental (scanning tunneling microscopy - STM) studies. For the individual CuPc and F(16)CuPc molecules, we calculated the electronic and optical properties using density functional theory (DFT) and time-dependent DFT and found a red-shift in the absorption peaks of F(16)CuPc relative to those of CuPc. In F(16)CuPc, the electronic wavefunctions are more polarized toward the electronegative fluorine atoms and away from the Cu atom at the center of the molecule. When adsorbed on graphene, the molecules lie flat and form closely packed patterns: F(16)CuPc forms a hexagonal pattern with two well-ordered alternating α and β stripes while CuPc arranges into a square lattice. The competition between molecule-substrate and intermolecular van der Waals interactions plays a crucial role in establishing the molecular patterns leading to tunable electron transfer from graphene to the molecules. This transfer is controlled by the layer thickness of, or the applied voltage on, epitaxial graphene resulting in selective F(16)CuPc adsorption, as observed in STM experiments. In addition, phthalocyanine adsorption modifies the electronic structure of the underlying graphene substrate introducing intensity smoothing in the range of 2-3 eV below the Dirac point (E(D)) and a small peak in the density of states at ～0.4 eV above E(D).     

高比表面积CuPc/TiO2纳米管复合材料的制备及其可见光光催化活性

以P25为前驱体,在碱性条件下采用水热法制备了TiO2纳米管(NT),然后通过浸渍法将敏化剂酞菁铜(CuPc)附着于TiO2NT表面,制得可见光响应的CuPc/TiO2NT复合光催化材料,并对其进行了表征,考察了它在可见光下降解罗丹明B的光催化活性.结果表明,在NaOH碱性条件下水热法制备的TiO2NT具有较大的比表面...     

Vibronic spectra of solutions and sols of copper phthalocyanine

Optical spectra of solutions and sols prepared from finely dispersed crystalline copper phthalocyanine (CuPc) were studied. The CuPc preparation was demonstrated to contain an admixture of an amorphous phase. The amorphous phase proved to be soluble in dioxane and heptane with the formation of a true molecular solution of CuPc. It was found that CuPc molecules are absorbed by polyethylene, polypropylene, polycaproamide, and cellulose triacetate films. The optical spectrum of individual CuPc molecules was demonstrated to differ substantially from those of particles of the pigment. It featured intense vibronic bands belonging to three π → π* transitions typical of aromatic structures and a series of bands characteristics of n → π* transitions involving nitrogen atoms (<29000 cm^?1) but showed no absorption bands characteristic of dispersions of the pigment in the visible spectrum (400–800 cm^?1). It was revealed that the Q-band (λ = 670 nm), assigned in the literature to individual CuPc molecule, in reality belongs to CuPc associates.     

Facile electrochemical growth of nanostructured copper phthalocyanine thin film via simultaneous anodic oxidation of copper and dilithium phthalocyanine for photoelectrochemical hydrogen evolution

We present a novel electrochemical approach to grow copper phthalocyanine (CuPc) thin-film photoelectrodes through anodic oxidation of copper and dilithium phthalocyanine (Li₂Pc). This circumvents the challenges associated with the electrochemical processing of unsubstituted CuPc from solution. The potentiostatic co-electrooxidation reaction at the heterogeneous interface favors the growth of CuPc thin film. The surface morphology of thin film exhibits nanorod-like features. UV-Vis, grazing angle Fourier transform infrared (FTIR), and grazing angle X-ray diffraction patterns reveal that the nanocrystalline phase corresponds only to α-CuPc and no admixture of other polymorphs. Photocurrent measurement shows a stable photoresponse in neutral medium. The photoelectrochemical hydrogen evolution on p-type CuPc coated copper photocathode shows an enhanced activity over bare copper and indium tin oxide (ITO) electrodeposited with CuPc and monolithium phthalocyanine radical (LiPc) thin films.     

TiO_2/CuPc/NiFe-LDH photoanode for efficient photoelectrochemical water splitting

Photoelectrochemical(PEC) water splitting is a promising approach for renewable hydrogen production.However,the practical PEC solar-to-fuel conversion efficiency is still low owing to poor light absorption and rapid recombination of charge carriers in photoelectrode.In this work,we report a ternary photoanode with simultaneously enhancement of light absorption and water oxidation efficiency by introducing copper phthalocyanine(CuPc) and nickel iron-laye red double hydroxide(NiFe-LDH) on TiO_2(denoted as TiO_2/CuPc/NiFe-LDH).An experimental study reveals that CuPc loading on TiO_2 bring strong visible light absorption;NiFe-LDH as an oxygen evolution reaction catalyst efficiently accelerates the surface water oxidation reaction.This synergistic effect of CuPc and NiFe-LDH gives enhanced photocurrent density(2.10 mA/cm2 at 0.6 V vs.SCE) and excellent stability in the ternary TiO_2/CuPc/NiFeLDH photoanode.