PdCl2对TiO2氧传感器响应特性的影响

把用厚陶瓷工艺制成的ＴiO2氧传感器用于汽车的空燃比控制,即可以节省燃油,又可以大大减轻汽车尾气对大气的污染,但未加催化剂的ＴiO2氧传感器响应速度慢,而在ＴiO2材料中加入ＰdCl2催化剂可以有效地提高氧敏传感器的化学反应速度,从而使ＴiO2氧传感器响应时间由７s减少到１．５s。     

LiZnVO4感湿玻璃的制备及应用

讲座了ＬiZnVＯ4感湿玻璃的制备、结构、湿度性能、敏感机理、稳定性以及在湿敏材料中的应用。结果表明：ＬiZnVＯ４材料是一种高性能的敏感材料,由ＬiZnVＯ4制备的湿敏玻璃陶瓷材料,例如ＺnCrO4-LiZnVO4,Zn2sNo4-LiZnVo4和ＴiO2-LiZnVO4材料,具有较高的湿度灵敏度及长稳定性,是一种较理想的湿度材料体系。     

纳米WO3材料的氨敏特性研究

通过热分解法,可制备出平均晶粒尺寸＜１００nm的ＷＯ３材料,在此材料中掺入适量的用溶胶－凝胶法制备的ＳiO2可制得对ＮＨ３有较好灵敏度的气敏元件,该元件选择性好,响应时间短,可作为理想的氨敏元件。     

碳纤维高温石墨化炉及材料选用

介绍了生产碳纤维的高温石墨化炉体材料的选用要求。说明了采用合适的炉体材料可节约能源，提高效率。     

纳米SiO_2改性金刚石柔性磨轮磨削性能的研究

文章通过依次研究超声分散时间、纳米添加量对丙烯酸树脂力学性能的影响规律,确定当纳米S iO2含量为3%,超声分散时间为15m in时树脂胶粘剂具有最佳抗拉伸强度和较高拉伸剪切强度,都较未超声分散时提高近21%;当超声分散15m in,纳米S iO2添加量为3%时,具有最佳抗拉强度和拉伸剪切强度,较未添加纳米S iO2时分别提高4%和7%;以胶料比为2∶1加入w 40金刚石后,经3%纳米S iO2改性胶粘剂抗拉伸强度提高40%,拉伸剪切强度提高36%;采用3%纳米S iO2改性后的丙烯酸树脂胶粘剂配制的金刚石柔性磨轮较未改性金刚石柔性磨轮磨削性能有大大提高,同时证明了胶粘剂力学性能与金刚石柔性磨轮磨削性能的相对应性。     

高温环保过滤材料的现状及发展趋势

文章简述了高温环保过滤材料的发展概况与机理,介绍了传统与新型高温滤料用纤维的性能特点,梳理了针刺、水刺、静电纺等加工成型工艺及涂层、覆膜、除尘脱硝等后整理技术的研发状况,并剖析了当前高温滤料存在的问题,最后指出环保化、复合化、功能化、差别化、产业化将是我国高温过滤材料的重点研发方向。     

一种新型传压介质制作工艺及其金刚石合成实验

传统的传压介质有两种,一种是普通叶腊石,一种是复合叶腊石,复合叶腊石块有多种配比及制作工艺,但无论哪种形式,均因S iO2与A l2O3匹配的不合理性、粘结剂使用的不当、粘结剂水份的带入及其高温收缩性而造成金刚石内部缺陷偏高、顶锤消耗偏高。通过多年实践,研发出了一种新型的多元素复合块制作工艺,可以大幅度提高金刚石的品质,降低顶锤消耗。     

i1iO和i1iSis2 XL两种测色仪器的对比

正随着社会物质文化水平的不断提升,人们对印刷质量的要求也在逐步提高,为了获得精美的印刷品,就需要对印刷色彩进行精确的测量与控制。目前,在印刷行业中,i1iO和i1iSis2以其准确的测色性能,高度的稳定性,丰富的色度数值以及自动化等特点,得到了普遍的应用,尤其是在G7、PMA等认证中,已经成为了标配的仪器。同属于i1系列的i1iO与i1iSis2这两种仪器的工作原理相同,都是在     

高止滑耐磨橡胶鞋底材料的制备及性能研究

溴化丁基橡胶(BIIR)和顺丁橡胶(BR)中添加不同用量的C5石油树脂后,通过模压硫化制备BIIR/BR/C5复合橡胶鞋底材料。采用无转子硫化仪、门尼粘度仪、动态热力学分析仪(DMA)等测试研究C5用量对BIIR/BR复合橡胶鞋底材料结构与性能的影响。结果表明,C5的加入延迟了BIIR/BR/C5复合材料的硫化时间,降低了交联密度和门尼粘度,提高了鞋底材料的加工性;随着C5用量的增加,复合材料的损耗峰向高温方向偏移且tanδmax和tanδ(0℃)增大,同时鞋底的湿滑性能得到明显改善,但C5对鞋底干滑性能的影响较弱;鞋底材料的机械性能如拉伸、耐磨、硬度等性能也受到C5的影响。     

纳米SiO2对不同淀粉品种的适用性分析

为研究纳米S iO2助剂对淀粉品种的适用性。选择木薯淀粉、玉米淀粉、小麦淀粉及马铃薯淀粉4种淀粉,采用小型浆纱机对纯棉经纱进行了上浆试验。试验结果表明,在淀粉浆料中添加适量纳米S iO2助剂之后,对提高淀粉的浆纱性能具有显著效果,各淀粉品种对浆纱耐磨性和毛羽降低率的影响按照小麦淀粉、木薯淀粉、玉米淀粉、马铃薯淀粉的顺序逐渐提高。     

屏蔽型纳米TiO2的结构及其整理棉织物的性能

在纳米TiO2颗粒外层包裹有机物和SiO2，经高温烧灼处理，制备了具有独特中空结构的屏蔽型纳米TiO2，其粒径20nm左右，锐钛矿相的含量80％以上。屏蔽型纳米TiO2具有明显的分解甲醛作用；其中空屏蔽结构阻隔了与被整理物之间的直接接触，光催化活性比未改性纳米TiO2有一定程度的降低，经其整理的棉织物的光催化降强也小得多。     

Uranium sorption on various forms of titanium dioxide--influence of surface area, surface charge, and impurities

Titanium dioxide (TiO(2)) has often served as a model substrate for experimental sorption studies of environmental contaminants. However, various forms of Ti-oxide have been used, and the different sorption properties of these materials have not been thoroughly studied. We investigated uranium sorption on some thoroughly characterized TiO(2) surfaces with particular attention to the influence of surface area, surface charge, and impurities. The sorption of U(VI) differed significantly between samples. Aggressive pretreatment of one material to remove impurities significantly altered the isoelectric point, determined by an electroacoustic method, but did not significantly impact U sorption. Differences in sorption properties between the various TiO(2) materials were related to the crystallographic form, morphology, surface area, and grain size, rather than to surface impurities or surface charge. In-situ attenuated total reflection Fourier-transform infrared (ATR FT-IR) spectroscopic studies showed that the spectra of the surface species of the TiO(2) samples are not significantly different, suggesting the formation of similar surface complexes. The data provide insights into the effect of different source materials and surface properties on radionuclide sorption.     

Enhanced photocatalytic degradation of dye pollutants under visible irradiation on Al(III)-modified TiO2: structure, interaction, and interfacial electron transfer

Aluminum(III)-modified TiO2 was prepared by sol-gel process via a sudden gelating method. The structure of the modified material and the local environment of aluminum were investigated using X-ray diffraction, HRTEM, XPS, 27Al MAS NMR, and xi-potential measurements. The effect of the aluminum modification on interaction between the dye and photocatalyst, the interfacial electron transfer process, and thereby the degradation of dye pollutants under visible irradiation were also examined by FTIR spectra and UV-vis diffuse reflectance spectra. It was found that, rather than incorporating into the crystal lattice of TiO2, the aluminum forms an overlayer of Al2O3 on the surface of TiO2, interfaced with Ti-O-Al bonds. It is interesting that the carboxylate-containing dyes such as Rhodamine B (RhB) adsorb preferentially on the Al2O3, rather than the Ti(IV) sites on the surface of TiO2. The photodegradation rate observed for RhB is nearly 5-fold faster than that obtained in the pristine TiO2 system. The photodegradation of dyes on the aluminum(III)-modified photocatalyst is of great dependence on the structure and anchoring group of the dyes. Structure with carboxylate as anchoring group and amino group as electron donor is favorable for degradation. The mechanistic details are discussed on the basis of experimental results.     

TiO2/ACF光催化材料的制备与特性

 本文采用溶胶-凝胶法制得TiO_2溶胶,并将TiO_2溶胶和粘胶基非织造布通过浸渍-干燥、磷酸活化和煅烧工艺一步法制备得到TiO_2/ACF光催化材料。采用EDAX、XRD、SEM对样品进行表征,同时测试了样品对亚甲基蓝溶液的催化降解性能。结果表明：样品负载上了锐钛矿型和金红石型的混晶的TiO_2;而且在样品的纤维上出现了孔洞,形成活性碳纤维;同时在20w紫外灯照射下,TiO_2/ACF光催化材料表现出了优异的光催化降解性能,500℃碳化条件得到的TiO_2/ACF光催化材料光催化降解亚甲基蓝溶液的脱色率达到98.83%。     

高温环保复合过滤材料研发及应用

以研发高温环保复合过滤材料为目标,选用耐高温、耐腐蚀、抗氧化的纤维为原料,采用针刺-水刺复合工艺,提高了高温环保复合过滤材料的微细粒子(PM2.5)的捕集效果,同时防止了细微粉尘进入过滤材料深层。迎尘面采用水刺层,具有表面过滤和利于清灰的作用,使表面对细微粉尘的过滤更加高效、可靠,并降低了过滤阻力。复合技术的应用还显著改善了过滤材料的耐温性能,并使其耐腐蚀性、抗氧化性和拉伸强力等显著提高,同时降低了生产成本。     

钨杂二氧化钛负载棉织物的微波法制备及光催化性能

采用(NH4)2TiF6为原料,钨酸钠和钨酸铵作为钨源在微波加热的条件下反应生成钨掺杂的锐钛矿W-TiO2,并采用微波辅助法原位处理到棉织物上从而赋予棉织物光催化性能。讨论了(NH4)2TiF6和H3BO3的摩尔比、微波加热温度、钨掺杂比等因素对TiO2晶型的影响,结果表明：(NH4)2TiF6和H3BO3以不同比例混合、微波加热温度、钨掺杂对TiO2晶型没有影响。研究了前驱体浓度、钨掺杂量、微波反应时间及温度对织物光催化性能的影响。制备具有光催化性能的W-TiO2/棉织物的最优工艺是：前驱体浓度为0.05mol/L,95℃微波加热45min,钨的最佳掺杂比例是5%。     

The state of nano-sized titanium dioxide (TiO2) may affect sunscreen performance

In the past several years, there has been a trend in the sunscreen/cosmetics industry to replace micron-sized titanium dioxide (TiO(2)) particles with nanoscale materials. The increased use of nanoscale TiO(2) has resulted in questions about these and other nanoproducts. This study examines the effects of using nanoscale TiO(2) on ultraviolet (UV) attenuation in simple to complex sunscreen formulations. UV light attenuation, product stability, and potential damage to the skin barrier were examined with both nanoscale and microscale TiO(2) particles. Results indicate that none of the formulations decreased the barrier function of the skin and the best UV attenuation occurs when the TiO(2) particles are stabilized with a coating and evenly distributed such as with non-agglomerated coated nanoscale materials. This indicates that nanoscale TiO(2) may have better efficacy while lacking toxicity.     

On the preparation of TiO2-sepiolite hybrid materials for the photocatalytic degradation of TCE: influence of TiO2 distribution in the mineralization

Hybrid structured photocatalysts based on sepiolite, an adsorbent, and TiO2 were prepared by extrusion of ceramic dough and conformed as plates. The influence of the photocatalyst configuration was studied either by including TiO2 in the extrusion process (incorporated materials) or by coating the sepiolite plates with a TiO2 film (coated materials). The influence of the OH- surface concentration in the photocatalytic performance was studied by treating the ceramic plates at different temperatures. The samples were characterized by N2 adsorption-desorption, MIP, SEM, XRD, and UV-vis-NIR spectroscopy and tested in the photocatalytic degradation of trichloroethylene (TCE) as a target VOC molecule. Most of the catalysts presented high photoactivity, but considerable differences were observed when the CO2 selectivity was analyzed. The results demonstrate that there is a significant effect of the catalyst configuration on the selectivity of the process. An intimate contact between the sepiolite fibers and TiO2 particles for incorporated materials with a corncob-like structure favored the migration of nondesirable reaction products such as COCl2 and dichloroacetyl chloride (DCAC) to the adsorbent, reacting with OH- groups of the adsorbent and favoring the TCE mimeralization.     

TiO2/MIL-88B(Fe)/聚丙烯复合熔喷非织造材料的制备及其性能

为使聚丙烯(PP)熔喷非织造材料功能化,扩大其在水处理方面的应用,以2,4-对苯二甲酸、六水合三氯化铁、纳米氧化钛为原料,PP熔喷非织造材料为基材,首先通过浸渍工艺预处理基底材料,再通过溶剂热法在PP熔喷非织造材料基材上负载金属有机框架材料TiO₂/MIL-88B(Fe),制备了TiO₂/MIL-88B(Fe)/PP复合熔喷非织造材料。借助红外光谱、X射线衍射及孔径分析对TiO₂/MIL-88B(Fe)/PP复合熔喷非织造材料的结构与性能进行了表征。结果表明TiO₂/MIL-88B(Fe)成功负载在PP熔喷非织造材料表面。在可见光照射条件下,TiO₂/MIL-88B(Fe)/PP复合熔喷非织造材料对甲基蓝、酸性橙7及酸性红73这3种染料的降解率均达到80%以上,其中对甲基蓝的降解率可达86%,对较难降解的罗丹明B的降解率也达到了59%。在重复使用5次后,复合熔喷非织造材料对甲基蓝降解率均在70%以上,性能较稳定。     

玻璃纤维/PTFE高温热压覆膜滤料的发展现状

叙述了高温烟气过滤材料的研究现状,分析了玻璃纤维/聚四氟乙烯(PTFE)覆膜滤料的表面过滤机理和与传统滤料相比其所具有的诸多优点。介绍了玻璃纤维/PTFE高温热压覆膜滤料的生产工艺,指出高温热压复合工艺是玻璃纤维/PTFE覆膜滤料品质的保证。