从铝酸钠溶液中析出一水软铝石的实验研究

通过热力学分析确定了铝酸钠溶液体系中三水铝石、一水软铝石平衡固相与温度和苛性比之间的关系。以三水铝石为前驱体，通过水热法处理，制得蛄晶良好、纯度较高的一水软铝石；升高温度，延长反应时间，减小前驱体粒度以及加入适量苛性碱都有利于三水铝石向一水软铝石的转变。以一水软铝石为晶种分解铝酸钠溶液的实验结果表明：分解原液浓度升高，分解率降低；晶种粒度减小，分解时间延长，分解率升高；在95℃，铝酸钠溶液只析出一水软铝石，且最大分解率可迭43．19％；而在85℃以下，分解产物为三水铝石。实验蛄果与理论分析结果相吻合。     

PET/AlOOH纳米复合材料的制备及性能研究

为了提高PET的阻燃性能.用原位聚合的方法制备出PET/AlOOH纳米复合材料.对纳米复合材料做了TEM,TGCONE和SEM的测试.结果显示:PET/AlOOH是纳米复合材料;其活化能比纯PET要高;纳米复合材料的热释放速率和生烟速率都明显的比纯PET低很多.因此,PET/AlOOH纳米复合材料具有很好的热稳定性和阻燃性能.     

Discovery of the superlarge gallium ore deposit in Jungar, Inner Mongolia, North China

Gallium, Ge, V, and U are the associated valuable elements in coal. From the 1950s to the 1970s, some researchers in the departments of coal industry and mineral resources of China investigated these elements in coal during geological explorations. The enrichment mechanism and the environmental influence of trace elements in coal have been deeply studied in recent twenty years. With respect to the ore-forming theories and practical utilizations of metals in coal, germanium was furthest studi…     

基于多孔氧化铝模板的勃姆石纳米线的形成

使用高纯铝箔作为初始原料,以多孔阳极氧化铝模板为中间产物,通过对多孔阳极氧化铝模板进行水热反应的方法制备出勃姆石（γ-AlOOH）纳米线,产物的特征长度为60 nm,直径在2～5 nm之间。整个实验方法简单,且没有引入其他杂质元素。分析了反应过程及水热反应温度和时间对勃姆石纳米线形貌的影响,并通过对比实验表明AAO模板的纳米多孔结构是水热反应生成勃姆石纳米结构的必要条件和主要原因。     

GPTMS/AlOOH透明复合涂膜热固化

为获得高性能透明涂膜,针对硬度和附着力,结合傅利叶红外表征,从温度和时间两个方面对γ-(2,3-环氧丙氧)丙基三甲氧基硅烷/一水软铝石(GPTMS/AlOOH)复合涂膜的热固化工艺进行研究.结果表明:随固化温度的提高和固化时间的延长,涂膜的硬度提高,附着力先提高后降低;涂膜的硬度由Si-O-Si和Al-O-Si的质量分...     

Preparation and Properties of Poly（Ethylene Terephthalate）/Boehmite Nanocomposite

Colloidal boehmite particles have been included into a polyethylene terephthalate matrix by in situ polymerization. Boehmite nanoparticles were produced by the controlled hydrolysis of aluminium isopropylate. The nanoparticles were characterized using Transmitted Electronic Microscopy （TEM） and X-ray Diffraction （XRD）, which revealed the particles of magnitude about 10 nm. The particles have been used without any surface modification. Characterization of the nanocomposite has been carried out using TEM and differential scanning calorimetry （DSC）. TEM images indicate that the particles have been homogeneously dispersed in the polymer. DSC results show that the presence of boehmite affects the process of crystallization of polyethylene terephthalate.     

水热条件下水合氧化铝(γ-AlOOH)的可控生长研究

以Al片为原料,采用水热法快速制备纳米水合氧化铝(γ-AlOOH).主要讨论了不同溶剂、不同表面活性剂和不同pH值对Al片的作用,制备出不同形貌的纳米水合氧化铝(γ-AlOOH),有纳米砖块(S1),纳米颗粒(S8),纳米线(S11),纳米片(S4、S6、S12),纳米盘(S7、S13),纳米花,S4、S14产物可以观察到是多层的结构,S2、S3、S5、S6、S9、S10、S12、S14产物可以观察到分层次的纳米建筑,初步实现了水合氧化铝的可控生长,并探讨了各种不同形貌γ-AlOOH的形成机理.     

Precipitation of spherical boehmite from concentrated sodium aluminate solution by adding gibbsite as seed

The precipitation of spherical boehmite was studied by surface energy calculations, measurements of precipitation ratios, Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The surface energy calculation results show that the (001) and (112) planes of gibbsite surfaces are remarkably stable because of their low surface energies. In addition, the (010) plane of boehmite grows preferentially during precipitation because of its low surface energy. Thus, we propose a method to precipitate spherical boehmite from a supersaturated sodium aluminate solution by adding gibbsite as seed in a heterogeneous system. In this method, gibbsite acts as the preliminary seed and saturation modifier. The results show that the fine boehmite first nucleates on the (001) and (112) planes of gibbsite and then grows vertically on the (001) and (112) basal planes of gibbsite via self-assembly, thereby forming spherical boehmite. Simultaneously, gibbsite is dissolved into the aluminate solution to maintain the saturation for the precipitation of boehmite. The precipitation ratio fluctuates (forming an M-shaped curve) because of gibbsite dissolution and boehmite precipitation. The mechanism of boehmite precipitation was further discussed on the basis of the differences in surface energy and solubility between gibbsite and boehmite. This study provides an environmentally friendly and economical method to prepare specific boehmite in a heterogeneous system.     

平果铝土矿最佳溶出条件研究

采用正交分析方法对平果铝土矿的溶出率进行最优分析，得到了氧化铝的溶出率与溶出温度、溶出时间、苛性碱浓度及石灰添加量的数学模型，利用该数学模型可以看出各个因素对溶出率影响的趋势，获得最佳的溶出条件，可以根据该模型制定更为合理的溶出工艺参数。     

常压制备针状勃姆石(γ-AlOOH)超微粒子

介绍了一种在常压和较低温度下制备针状勃姆石（γ－AlOOH）和Al2O3超微粒子的方法．以Al（OH）3胶体为前驱物,加入微量酒石酸钠和十二烷基磺酸钠作为形状和粒度的控制剂,经常压下回流加热,制备出针状超细勃姆石微粒,其长宽比约30nm：4nm．再经55℃2h锻烧后得γ－Al2O3超细粒子．用χ射线衍射、透射电子显微镜以及热重、差热等方法对产物进行了表征．