合成条件对硅基介孔分子筛结构的影响

采用水热法制备硅基介孔分子筛材料,较系统地考察了合成条件对其结构的影响,并利用N2吸附、透射电镜(TEM)等手段进行了表征.研究发现,随着晶化温度的升高,硅基介孔分子筛材料的平均孔径在逐渐增大,而比表面先增大后减小,100℃晶化时比表面最大(905.60 m2/g);随着晶化时间的延长,样品的平均孔径先增大后减小,比表面却正好相反,晶化1 d时比表面是905.60 m2/g,晶化3 d时比表面降为788.91m2/g;随着焙烧温度的升高比表面和孔径均减小,表明高温下焙烧易导致介孔结构的塌陷.     

配位聚合物[Nd2(C2O4)3·4H2O]n的水热合成和晶体结构

NdCl3·6H2O与4-羧基尿嘧啶于170℃水热反应96h，得到配位聚合物[Nd2（C2O4）3·4H2O]n，用X-射线单晶衍射分析确定了其晶体结构．配合物属于正交晶系，P2（1）2（1）2（1）空间群．晶胞参数：a=0．85927（9）nm,b=0．94648（11）nm，c=1．68373（19）nm，M=624．60，V=1．3693（3）nm^3，Z=4，Dcale=3．030Mg／m^3，F（000）=1168,乙二酸根以双齿桥联／双齿桥联和双齿桥联，三齿桥联两种配位方式与Nd（Ⅲ）离子键合，形成网状结构。     

绣球形纳米氧化锌的制备及表征

采用水热法以硝酸锌为原料,尿素为沉淀剂,同时加入表面活性剂,来制备绣球形纳米氧化锌。用SEM对制备的绣球形纳米氧化锌进行表征,发现得到绣球形氧化锌是由片状氧化锌自组装而成。通过改变锌盐的浓度、尿素的含量、反应时间、反应温度等条件,研究了这些条件对所得产物形貌的影响,并探讨了绣球形氧化锌的形成机理。在温度为120℃、时间为3～5h、锌盐的浓度为1.2mol/L条件下得到片状纳米氧化锌。随着锌盐浓度的增加,这些纳米片自组装成了绣球形氧化锌。     

CaSnO_3/膨润土复合光催化剂的制备及对亚甲基蓝的光催化降解性能

采用水热合成法制备出CaSnO3/膨润土复合光催化剂,采用XRD、SEM和IR等分析手段对该样品的形貌和结构进行表征,并研究了其对亚甲基蓝水溶液的光催化降解性能.结果表明:负载比例为3%的CaSnO3/膨润土复合光催化剂对亚甲基蓝水溶液的降解效果最好,当催化剂用量为60 mg,反应时间为14 min时,降解率可达98%.     

含Mo—O的无机／有机杂化晶体的水热合成与表征

用水热方法合成了Mo-O/EN的无机/有机杂化晶体,并用X-射线衍射对其结构进行了表征.该晶体属于单斜晶系,P2(1)/n空间群,a＝8.086(2),b＝14.467(1),c＝8.920(1),β＝98.152(14)°,V＝1032.9(2)3,z＝8.     

Revisit the K-segment of the Southeast Indian Ridge for new evidence of hydrothermal plumes

During the first leg of a Chinese research cruise to the Southeast Indian Ridge (SEIR) in 2007, we revisited the K-segment of the SEIR and observed a water column turbidity anomaly at a CTD cast station. This station was located ~400 m from a dredge site on a plume anomaly detected in 1996 by US scientists. The characteristics of the turbidity anomaly detected in our survey are different from those observed 11 years previously, implying that either the detected anomalies have distinct and different plume sources or the robustness of the plume has changed in the intervening time. In addition, turbidity anomalies were observed at two localities on the K-segment in a deep tow-yo profile. If these two anomalies are not connected, the plume incidence calculated would be about 0.28, larger than the predicted value of 0.25 for a 65 mm/a spreading rate. This increase in plume incidence on the K-segment seems to be related to the influence of the St. Paul-Amsterdam hotspot, located about 300 km to the northwest.     

超大型矿床研究中某些问题的讨论及找矿

超大型矿床，一般指单个矿床中规模达超大型者。若将矿田内多个矿床，合称超大型矿床，则与矿床和矿田定义不符，应研究统一术语。超大型矿床划分标准，应便于全球对比和简单易行。提出一个以Ｐ．Ｌａｚｎｉｃｋａ和涂光炽的划分标准为基础的综合方案，在统一标准以前供同行研究时参考。超大型矿床分布形式，分点式、带式及首领式。后者为找矿重点。关于超大型矿床成矿流体特征、控矿因素和找矿问题，以某些金矿为例作了初步研究。未发现任何独特的成矿流体。这类矿床的形成受多因素控制，具多因复成矿床特点。综合运用多种找矿方法与手段，但有侧重，是适宜的。     

Morphological characteristics of α-Al2O3 crystallites obtained direct1y from hydro /solvothermal solvents

The morphological characteristics of α-Al₂O₃ crystallites obtained directly from hydro/solv othermal solvents are reported and the formation mechanisms of corundum morphology are discussed from crystal growth and crystal chemistry principles. The crystal growth process is considered as a process of incorporation of growth units on the growth interfaces, and the crystal morphology is determined by the linkage of the coordinated polyhedra.