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1.
纳米铁氧体复合涂料的制备及性能研究 总被引：1，自引：0，他引：1
运用原位乳液聚合法和机械共混法两种方法制备了纳米Fe3O4和BaFe12O19改性丙烯酸树脂涂料,并对复合涂料的性能进行了研究,发现原位乳液聚合法制备的纳米Fe3O4和BaFe12O19改性丙烯酸树脂涂料的吸波性能明显优于机械共混法制备的纳米复合涂料． 相似文献
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王梦瑜 《安徽教育学院学报》2011,29(3):26-31
本文采用溶胶凝胶自燃烧法制备了粒径在200~300nm的单相六角铁酸钡粉体,并对其进行球磨,外加PEG-20000为分散剂,调节料浆的pH值等手段对六角铁酸钡磁性颗粒进行分散,研究表明球磨过程中磁性颗粒经历了团聚后打开,然后有形成诸如磁链、磁环等磁结构的过程。对六角铁酸钡进行干压（未加磁场和加磁场）以及磁场下悬浮-沉降等工艺成型,经过压力和磁场的作用得到的块材沿易磁化方向具有一定的取向。磁性测试结果表明：球磨前后的粉体比磁化强度（1.5T）从40.3emu/g上升到了51.5emu/g,这个数值接近铁酸钡单晶磁化强度,矫顽力从4.1kOe小幅度提高到4.3kOe。悬浮-沉降成型比磁化强度（1.0T）就达到了48.4emu/g,而矫顽力有明显下降。 相似文献
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The TiO2thin films have attracted attention be-cause of their remarkable optical and electronic prop-erties[1,2]. They are used in a wide variety of applica-tions such as photocatalysts[3,4], gas sensors[5,6]andsolar cells. Titania exists mainly in three … 相似文献
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TiO2 fibers were prepared via alternatively introducing water vapor and Ti precursor carried by Ne to an APCVD (chemical vapor deposition under atmospheric pressure) reactor at <200 ℃. Activated carbon fibers (ACFs) were used as templates for deposition and later removed by calcinations. The obtained catalysts were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brtmauer, Emmett and Teller (BET) and X-ray diffraction (XRD) analysisThe pores within TiO2 fibers included micro-range and meso-range, e.g., 7 nm, and the specific surface areas for TiO2 fibers were 141 m2/g and 148 m2/g for samples deposited at 100 ℃ and 200 ℃ (using ACF1700 as template), respectively. The deposition temperature significantly influenced TiO2 morphology. The special advantages of this technique for preparing porous nano-material include no consumption of organic solvent in the process and easy control of deposition conditions and speeds. 相似文献
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猪油制备烷醇酰胺表面活性剂 总被引：2，自引：0，他引：2
以猪油与甲醇酯交换反应得到的脂肪酸甲酯为原料,在催化剂作用下与二乙醇胺合成烷醇酰胺．考察了反应温度、反应时间、催化剂用量、真空度等因素对反应的影响,通过单因素实验和正交实验确定出最佳配方和反应条件：n（甲酯）：n（二乙醇胺）=1：1．6,反应温度100℃,反应时间2．0h,真空度0．07MPa,催化剂用量0．6％（基于脂肪酸甲酯的质量）,烷醇酰胺的收率达95．45％．通过红外光谱仪对产物进行了结构表征,并对界面张力进行了测定．结果表明,产物具有较好的界面活性,为猪油的综合利用探索了一条新的途经． 相似文献
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Interaction of nonionic surfactant AEO9 with ionic surfactants 总被引：2，自引：0，他引：2
INTRODUCTION Long chain nonionic surfactants such as poly-oxyethylenated alcohols C12H25O(CH2CH2O)9H (AEO9), are widely used in the chemical industry in fabric detergency and tertiary oil recovery due to their excellent surface-active properties. In many practical applications, surfactants are used in formulations containing mixtures of different compounds, and synergism can often be observed. Synergism is de-fined here as the condition in which the properties of a mixture are better… 相似文献
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以钛酸丁酯为前驱物,无水乙醇为溶剂,冰醋酸为抑制剂,硝酸为催化剂在低温条件下制备纳米二氧化钛凝胶.通过定量分析得出优化工艺条件：V乙醇/V钛酸丁酯为6,V水/V钛酸丁酯为1,V冰醋酸/V钛酸丁酯为1,体系pH为3~4,凝胶时间为2~4h,煅烧温度为500°C,煅烧时间为2h.用激光粒度仪表征纳米TiO2颗粒平均粒径为800nm,用XRD表征计算晶粒粒径为25nm. 相似文献
8.
分别以表面活性剂PEG-400和PEG-600为分散剂,FeSO4.7H2O和Na2CO3室温下发生固相反应,得到纳米氧化铁前驱体FeCO3,热解后即可得到产品.经TG/DTA、IR、XRD对前驱体及其热解产物进行表征,表明前驱体FeCO3极易分解成纳米Fe2O3,550℃热解得到了纯晶相的三方Fe2O3,粒度分别约为48.2 nm,50.7 nm. 相似文献
9.
溶胶-凝胶法制备四钛酸钾晶须 总被引：1，自引：0，他引：1
以Ti（n-OC4H9）4和CH3 COOK为前驱体，采用溶胶-凝胶法制备了高质量的K2Ti4O9晶须。以FT-IR表征溶胶-凝胶过程中的反应，运用TC-DSC和XRD研究了K2Ti4RO9的晶体生长过程。结果表明：溶胶很稳定，可长期保存；稀释剂和少量水对溶胶的稳定性无影响；溶胶-凝胶法制备K2Ti4O9晶须反应温度比固态烧结法低，276℃开始反应形成晶核，481℃开始生成K2Ti4O9纳米晶，597。C时形成K2Ti4O9晶粒，940℃制得的K2Ti4O9晶须长约50μm，K2Ti4O9晶须均匀、具有较大的长径比。 相似文献
10.
TiO2 fibers were prepared via alternatively introducing water vapor and Ti precursor carried by N2 to an APCVD （chemical vapor deposition under atmospheric pressure） reactor at ≤200 ℃. Activated carbon fibers （ACFs） were used as templates for deposition and later removed by calcinations. The obtained catalysts were characterized by scanning electron micros- copy （SEM）, transmission electron microscopy （TEM）, Brunauer, Emmett and Teller （BET） and X-ray diffraction （XRD） analysis The pores within TiO2 fibers included micro-range and meso-range, e.g., 7 nm, and the specific surface areas for TiO2 fibers were 141 m^2/g and 148 m^2/g for samples deposited at 100 ℃ and 200℃ （using ACFI700 as template）, respectively. The deposition temperature significantly influenced TiO2 morphology. The special advantages of this technique for preparing porous nano-material include no consumption of organic solvent in the process and easy control of deposition conditions and speeds. 相似文献
11.
硫酸铝催化合成乙酸乙酯实验研究 总被引：3，自引：0，他引：3
酯化法合成乙酸乙酯成本较高的原因,一是设备投资大,二是产率较低.而采用Al2(SO4)3·18H2O作为催化剂,并对设备进行一些改进,产率可达97.8%.产品无色透明, 其折光率与文献值一致.,由于Al2(SO4)3·18H2O无毒无害、便宜易得、与环境友好,催化剂活性高、可反复使用,所得乙酸乙酯用于食用香料更安全,所以该方法不仅很适合学生实验,而且也具有一定的工业开发价值. 相似文献
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HMS mesoporous molecular sieve was synthesized hydrothermally by using dodecylamine (DDA) as template and tetethylorthosilicalite (TEOS) as silicon source. The influence of the hydrothermal synthesis conditions on HMS particle size was studied systematically. The results showed that the smaller particle was obtained under the condition of DDA/SiO2=0.27, H2O/SiO2=66.7, EtOH/SiO2=6.5 mol and synthesis time of 18 h. The presences of additives (TW20, TW60, SP60 and Neopelex) also helped to the reduction of particle size. The HMS mesoporous molecular sieve with particle size around 60～100 nm was obtained by using TW20 or TW60 as an additive. In addition, TEM image showed that HMS mesoporous molecular sieve with pariticle size about 20～100 nm was synthesized in microemulsion. 相似文献
14.
以钛酸正丁酯为先驱体,乙醇为溶剂,盐酸为催化剂,以溶胶凝胶法制备TiO2溶胶,并将其负载于经纯化处理的碳纳米管上,再经不同温度煅烧获得TiO2复合光催化剂。用红外光谱对TiO2煅烧及负载前后进行结构表征,考察了光照条件下溴酚蓝的降解率。采用溶胶-凝胶及负载方法获得CNT-TiO2光催化剂并且明显提高了TiO2光催化效果。加入光催化剂的溴酚蓝容易在20min时降解率达到89%,远高于未负载前的46%的降解率。经比较,400℃煅烧的CNT-TiO2光催化剂的光降解效果相对较好。 相似文献
15.
以硝酸铝[Al（NO3）3.9H2O]和硝酸钇[Y（NO3）3.6H2O]为原料,碳酸氢铵[NH4HCO3]为沉淀剂,PET400为分散剂。采用共沉淀法制备了YAG前驱体粉末,分别用直接干燥和共沸蒸馏对YAG前驱体粉末进行脱水处理。用X射线仪、扫描电子显微镜、粒度分析仪等测试手段对产品进行表征。结果表明：采用共沉淀法,在1200℃煅烧1h,相对于直接烘干,共沸蒸馏制得的YAG粉末纯度更高,粒度更细,分布更均匀,团聚较少。 相似文献
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Li-hua Teng 《浙江大学学报(A卷英文版)》2008,9(9):1288-1295
Fluidized-bed reactor is a candidate for dimethyl ether （DME） synthesis from syngas because of its excellent heat removal capability. In order to improve the attrition resistance of catalyst, an amount of silica sol as binder was added to the catalyst composed of methanol synthesis component CuO/ZnO/Al2O3 and methanol dehydration component HZSM-5, which was prepared by coprecipitation and shaped by spray drying to get spherical particles. The effect of silica sol on the catalytic activity was investigated in a fixed-bed flow microreactor. Based on the experiment results, silica sol in the range of 0-20wt% had small effect on the catalytic activity. Generally, the CO conversion and DME yield decreased with the increase in concentration of silica sol, while the attrition resistance of catalysts increased with increasing silica sol, indicating that it was feasible to improve the attrition resistance without greatly sacrificing the activity of catalyst. In addition, the characterizations of catalysts were carried out using Brunauer-Emmett-Teller （BET）, X-ray powder diffraction （XRD） and temperature programmed reduction （TPR）. 相似文献
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董铸荣 《深圳职业技术学院学报》2006,5(2):31-33
介绍了加入1#、2#和3#柴油添加剂的油品1#、2#和3#和未加添加剂的油品0#,分别进行十六皖值等物理性质的机理实验,以及3种柴油添加剂的除碳能力实验。实验结果显示,加入不同柴油添加剂,油品的各项物理性质均有变化。经分析,十六烷值的提高和表面张力的降低对油品有积极的影响。胶质实验和柴油添加剂除碳能力实验的结果显示,柴油添加剂在一定程度上具有减少胶质生成和去除积碳的功效。 相似文献
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李冬梅 《广东教育学院学报》2007,27(3):56-58
为了揭示多个表面割口单向纤维增强复合材料叠层板的拉伸破坏机理,预估其破坏规律,基于剪滞理论,建立一种对各单层分划为有限子单元的剪滞分析模型,分析含三个平行的表面割口单向叠层板在拉伸载荷作用下的应力重新分布及各割口之间的相互影响问题,获得了表面割口附近完整纤维的应力集中因子、应力及位移分布规律. 相似文献
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该文利用静电纺丝技术和溶胶—凝胶法成功制备了PVP/Ti（OiPr）4复合纤维,并对其进行热处理,制备了尺度均一、形貌较好且具有较高比表面积的TiO2纳米纤维.并通过对PVP/Ti（OiPr）4复合纤维进行各种表征,确定了不同温度下TiO2先催化剂的晶型. 相似文献