四氯化钛低温水解直接制备金红石型纳米二氧化钛

以四氯化钛为原料, 在低温条件下水解, 直接得到金红石型纳米二氧化钛粉体. 通过对粉体进行XRD, TEM和BET等的表征表明, 四氯化钛的盐酸溶液在低温水解中直接生成金红石相质量分数高达99.24%的沉淀产物, 经干燥或进一步在较低温度（200, 300, 400 ℃）下煅烧即可得到金红石型二氧化钛粉体, 制得的粉体粒子呈椭圆形, 粒径为10～30 nm, 且分散性好, 比表面积大.     

屏蔽紫外用金红石型纳米TiO2的制备

以偏钛酸为原料，采用溶胶—凝胶法制备抗紫外金红石纳米二氧化钛，着重研究了金红石促进剂添加量反应温度、煅烧温度、煅烧时间对二氧化钛的晶型转化率、粒径的影响，并讨论了晶粒尺寸对紫外屏蔽的影响。     

一种金红石型二氧化钛微球的制备方法

本发明公开了一种金红石型二氧化钛微球的制备方法。该方法将钛酸四丁酯溶于浓度为1．5～2．5mol／L的HCl溶液中,钛酸四丁酯在混合后溶液中的浓度为0．1～1．0mol／L,将混合液放人带有聚四氟乙烯内衬的高压釜中,在100～180℃下水热反应6～24h,自然冷却后,产物洗涤、过滤、干燥即可得直径为300～500nm的二氧化钛微球。     

金红石纳米TiO2在涂料中的应用研究

对比了紫外线吸收剂CIBA5151和经过无机、有机处理后的金红石纳米二氧化钛对涂料综合性能的影响，着重讨论了金红石纳米TiO2添加量对涂料附着力、柔韧性、抗冲击能力、抗老化等性能的影响。结果表明，在涂料中添加适量的金红石纳米TiO2可以提高其抗老化、力学性能指标。     

湖南大学研发纳米二氧化钛改性氟碳涂料

湖南大学余刚、胡波年和杨景花等人日前研究成功一种纳米二氧化钛改性氟碳涂料及其制备工艺与应用，该涂料是将锐钛矿型纳米TiO2和金红石型纳米TiO2混合物添加到现有氟碳涂料中，添加比例为：锐钛矿型纳米TiO2和金红石型纳米TiO2混合物，氟碳涂料的质量比为1～4：100；所述锐钛矿型纳米TiO2和金红石型纳米TiO2混合物中，锐钛矿型纳米TiO2和金红石型纳米TiO2二者质量配比为4：1。本发明还包括所述改性氟碳涂料的制备工艺及用于涂敷铝合金板材的前处理工艺。使用本发明之氟碳涂料涂装后的铝合金型材和板材具有良好的白清洁性能，耐沾污和耐洗刷性能，良好的耐候性、耐化学腐蚀性，防水防潮，质量轻、防震、隔声、隔热、色泽均匀、不开裂、不变形、不剥落、不褪色等特点。     

金红石型纳米TiO2用于重防腐涂料耐候性的研究

对金红石型纳米TiO2用于防腐涂料耐候抗老化性能进行了研究。用不同配比的纳米TiO2制备的纳米复合涂料,能有效阻止基体树脂的氧化,延长涂料使用寿命,提高涂料防腐性能,而且改性能力与纳米粉体的加入量呈一定比例关系。纳米TiO2吸收光谱表明,TiO2在200—400nm紫外光区能吸收95％以上的紫外光。     

金红石二氧化钛粒径与蓝相指标的相关性研究

采用不同的K₂O、P₂O₅、ZnO盐处理配方处理偏钛酸,煅烧后得到金红石含量合格的硫酸法钛白初品,检测蓝相指标SCX、ZS90平均粒径Z-Ave和SEM平均粒径,并通过线性拟合和回归等手段分析三者之间的线性相关性。结果表明,钛白初品的ZS90平均粒径Z-Ave和SEM平均粒径与SCX的线性相关性指标Pearson相关系数分别达到了-0.957和-0.935,说明该两项粒径指标大小均与SCX值成负线性相关性。SCX与Z-Ave线性回归方程的R-Sq达到了91.6%,SCX与SEM平均粒径线性回归方程的R-Sq达到了87.5%,线性回归结果表明,采用SCX值对Z-Ave的预测有效性要稍高于对SEM平均粒径的预测有效性。钛白粉厂家可将常规监测指标SCX值带入相应的拟合方程式来对产品粒径进行统计分析和跟踪,并据此对工艺技术进行调整。     

金红石和锐钛型TiO2的X射线衍射定量分析

就Ｄ／ｍａｘ－ＲＣ转靶Ｘ射线衍射仪对金红石和锐钛型ＴｉＯ_２定量分析精度和主要误差因素进行了探讨。指出金红石和锐钛型ＴｉＯ_２定量分析用纯标样法和Ｋ值法配合使用为宜；在Ｃｕ－Ｋα辐射条件下（衍射峰背底扣除△２θ在０．７～１．２°之间），扫描速度≤５°／ｍｉｎ，试样中金红石或锐钛型ＴｉＯ_２含量在１５％以上，定量误差＜５％。     

用金红石型纳米TiO2改善粉末涂料耐光老化性能

以金红石型纳米TiO2为抗紫外光老化添加剂改性聚酯粉末涂料,采用TEM、XRD等测试手段表征纳米TiO2的性能特征,并用UV-Vis分析金红石型纳米TiO2、锐钛型纳米TiO2以及普通金红石型钛白粉的紫外-可见光特征谱。探讨了纳米TiO2屏蔽紫外线的机理,并用高压紫外汞灯人工加速聚酯粉末涂料的光老化降解,对比分析了未改性聚酯粉末涂料、金红石型纳米TiO2改性聚酯粉末涂料以及有机紫外吸收剂改性聚酯粉末涂料的光泽度变化和色差变化。研究结果表明,纳米TiO2能够使聚酯粉末涂料的抗紫外光老化性能得到较大幅度改善,并能赋予聚酯粉末涂料优异的耐候性能和延长产品的户外使用寿命。     

金红石纳米二氧化钛在涂料中的应用

利用透射电镜(TEM)对纳米二氧化钛的形貌和粒度进行分析后,将纳米二氧化钛制成乳胶漆、汽车漆、家具漆和防腐漆,对其进行耐候性、随角异色等性能分析。结果表明,金红石纳米二氧化钛可大幅度提高乳胶漆的耐候性、耐水性、耐碱性和耐洗刷性能,可提高家具漆和防腐漆的耐候性;纳米二氧化钛和铝粉配合制成的汽车漆具有随角异色效果,二氧化钛的粒度对其随角异色性能有很大影响,平均粒径为280 nm的普通颜料钛白改性铝粉漆无随角异色效果,平均粒径为35 nm的纳米二氧化钛改性铝粉漆有显著的随角异色效果,并且随纳米二氧化钛加量的增加,其不同角度的颜色差异增大。     

Titanium-Supported Titania Photoelectrodes Made by Sol-Gel Processes

Titanium-supported titania-based photoelectrodes were prepared either by sol-gel processes or by thermal oxidation. Catalytic activities and stabilities of these photoelectrodes were monitored by photooxidizing formic acid in aqueous NaCl during three successive experiments under identical conditions. Although electrodes coated with either titania (higher activity) or zirconia-titania (lower activity) and heated at 300°C were less active initially than similar electrodes heated to higher temperatures, electrodes heated at 300°C were more stable. Activities of titania electrodes were increased by depositing the titania at a higher withdrawal speed (21.5 versus 1.5 cm min?1) and by depositing more layers of titania. Stabilities of multilayer electrodes were improved by depositing the sol faster. Applying positive electrical potentials across electrodes also increased their activities. In particular, while activities diminished considerably in relatively high concentrations of NaCl if no potential was present, activities decreased only slightly under an electrical field. Activities of photoelectrodes prepared by heating metallic titanium plates at 300°C were low. Activities of photoelectrodes prepared by heating titanium at 500°C (giving a rutile coating) were similar to activities of photoelectrodes prepared by sol-gel techniques, but only when potentials were applied.     

溶胶-凝胶燃烧合成法制备SmBO3粉体及其性能研究

利用溶胶-凝胶燃烧合成法,在750℃热处理2 h的条件下制备了SmBO3粉体,颗粒大小在100 nm左右.红外吸收光谱显示材料在500～1400 cm-1波数范围内,存在较为集中的吸收峰.此外,由于Sm3+的6H5/2→6F9/2跃迁,使得SmBO3粉体在1.05～1.15μm的范围内反射率降低.因此,SmBO3粉体可能是一种性能较好的针对1.06和10.6μm激光的激光光防护材料和滤光功能材料.     

Synthesis and Luminescence Properties of Ternary Europium Complexes inTitania Matrix in the Presence of Dimethylformamide by a Sol-Gel Process

Thesol-gelmethodoffersanewapproachtothesynthesisofglasses,ceramics,fibersand.compositesrelatedtotheopticalproperties['j.Sincesomelanthanideionspossessgoodlumi-nescencecharacteristicsbasedontheelectronictransiti0nsamongthe4fenergylevels,aseriesofrareearthcompoundshavebeenstudiedforprac-ticalapplicationsasphosphors.SomestudiesonluminescencebehaviorofEuCl3andEu(NO3)3.alt.[z's]adsorbedonporousglasses,dopedintosol-gelderivedhostsandusedasaprobetostudytheenvironmentofEu3 duringthedifferentstages0f…     

Synthesis of Nanocrystalline La1-xSrxCrO3 by Sol-Gel Method

The nanocrystalline La1-xSrxCrO3 was prepared by sol-gel method using La( NO3 )3 · 6H2O, Sr( NO3 )2 and respectively. The phase transformation from dry-gel to crystal was investigated by means of TG, DSC and XRD. Influences of temperature and Sr quantity on particle-diameters were observed by HREM. The experimental results show that the best calcined temperature is near 800 ℃. The particle-diameters decrease with the increase of Sr quantity. The chromite phase formed continuously during crystallization process, which is mainly composed of four steps: ( 1 ) Carbonates first formed by decomposing metal citrates. (2) The decomposition of carbonates occurred metal oxides. (3) La0. 9Sr0.1 CrO4 were synthesized by the reaction of metal oxides. (4) Chromite phase formed lastly due to the decomposition of chromate phase.     

VO2 纳米粉末的无机溶胶-凝胶法合成及表征

采用V2 O5粉末为原料 ,应用无机溶胶 凝胶法制备VO2 纳米粉末 ,通过对制备过程及相关产物的DSC ,TGA ,XRD和TEM的测试分析 ,揭示出本方法中V2 O5向VO2 的物相转变过程 ,发现V2 O5凝胶粉末在真空条件下于35 0℃开始分解 ,达 110 0℃时还原成VO2 ,其颗粒粒径介于 5 0～ 70nm。     

Synthesis and Luminescent Properties of Superfine Sr2CeO4 Phosphors by Sol-Gel Auto- Combustion Method

Citric acid complexing sol-gel auto-combustion method was explored to synthesize superfine Sr2CeO4 phosphors using the inorganic salts Sr（NO3）2 and Ce（NO3）3 as raw materials together with citric acid （CA） as a chelating agent. TGDTA, XRD, SEM and photoluminescence spectra were used to investigate the formation process, microstructure and luminescent properties of the synthesized Sr2CeO4. The results show that the crystallization of Sr2CeO4 begins at about 800 ℃ and completes around 900 ℃ with an orthorhombic structure. When the calcination temperature is above 1000 ℃, Sr2CeO4 partly decomposes into SrCeO3. SEM studies show that the particles of Sr2CeO4 obtained at 900 ℃ are sphericallike shape and superfine with diameter below 100 nm. The excitation spectrum of the superfine Sr2CeO4 phosphors displays a broad band with two peaks around 290 and 350 nm respectively. The former peak is stronger than the latter one. This broad band is due to the charge transfer （CT） band of the Ce^4＋ ion. Excited by a radiation of 290 nm, the superfine phosphors emit a strong blue-white fluorescence, and the emission spectrum shows a broad band with a peak around 470 nm, which can be assigned to the f→t1g transition of Ce^4＋ . It is found that the emission intensity is affected by the calcination temperature.     

ICP-AES法测定金红石及钛铁矿中锆

建立ICP-AES法测定金红石及钛铁矿中锆含量的方法.样品碱熔,水浸出,碱分离除去大量盐类,在盐酸介质中采用ICP-AES法测定.对样品的溶解方式和影响测定结果的各种因素进行了研究,Zr的检出限为0.0009～0.0039μg/mL,相对标准偏差（RSD,n=12）为0.59％ ～6.16％,回收率为：97％～116％,测定范围：0.005％～5％.本方法简单准确,应用于生产两年,选矿实验金属平衡良好.     

正交实验法研究Sol-Gel纳米二氧化钛微粒制备工艺

以钛酸丁酯为前驱物、无水乙醇作溶剂、盐酸作负催化剂、冰醋酸作为抑止剂，采用溶胶-凝胶法制备了纳米TiO2微粒。通过正交实验分析研究了溶剂量、加水量、凝胶温度、搅拌速度、抑止剂含量等条件对二氧化钛溶胶-凝胶形成过程、凝胶时间的影响，得出了制备稳定溶胶、良好凝胶的凝胶时间。以及适宜的工艺条件。     

SO2-4,NO-3,Cl-对ZnS,CdS纳米粉末晶型的影响

考察了采用均相沉淀法制备单分散ZnS和CdS纳米微粒时，溶液中SO4^2-、NO3^-和Cl^-对粉末晶型的影响。结果表明，SO4^2-、NO3^-和Cl^-对ZnS粉末晶型基本上没有影响；而在NO3^-、SO4^2-体系中得到闪锌矿型CdS粉末，在Cl^-体系中，得到纤维锌矿结构CdS粉末。这是因为在Cl^-体系中，Cl^-和Cd^2 的络合作用不仅改变了溶液中沉淀离子的过饱和度，更重要的是改变了溶液中生长基元的存在形式及其连接方式，从而生成了结构更稳定的纤维锌矿型CdS晶体。     

含稀土Li3VO4基材料的非醇盐溶胶-凝胶法合成及其离子导电性

用非醇盐溶胶－凝胶法制备了含稀土Ｌｉ３ＶＯ４基锂离子导体材料,应用交流阻抗谱技术测定了样品的离子电导。实验表明：稀土氧化物的加入在一定程度上改变了Ｌｉ３ＶＯ４的电导率,讨论了这种影响的机理。