Synthesis and photocatalytic properties of BiOCl nanowire arrays

Bismuth oxychloride (BiOCl) nanowire arrays have been successfully prepared employing the Anodic Aluminum Oxide (AAO) template assisted sol-gel method. Nanowires of 100 nm diameter and length 2-6 μm, assembled in the porous of AAO templates, were formed. XRD and HRTEM results show that the nanowires are pure BiOCl polycrystal phase without Bi₂O₃ or BiCl₃. The photocatalytic activity of BiOCl nanowire arrays was investigated by the degradation of Rhodamine B dye solution under UV irradiation.     

Nanowires: properties,applications and synthesis via porous anodic aluminium oxide template

Quasi one-dimensional nanowires possess unique electrical, electronic, thermoelectrical, optical, magnetic and chemical properties, which are different from that of their parent counterpart. The physical properties of nanowires are influenced by the morphology of the nanowires, diameter dependent band gap, carrier density of states etc. Nanowires hold lot of promises for different applications. Basic electronic devices like junction diodes, transistors, FETs and logic gates can be fabricated by using semiconductor and superlattice nanowires. Thermoelectric cooling system can be fabricated by using metallic nanowires. Semiconductor nanowire junctions can be used for different opto-electronic applications. Moreover, periodic arrays of magnetic nanowires hold high potential for recording media application. Nanowires are also potential candidates for sensor and bio-medical applications. In the present article, the physical and chemical properties of nanowires along with their probable applications in different fields have been reviewed in detail. The review also includes highlights of the synthesis of nanowires via porous anodic aluminium oxide template since the technique is simple, cost-effective and a low temperature technique.     

Friction Study of a Ni Nanodot-patterned Surface

Nanoscale frictional behavior of a Ni nanodot-patterned surface (NDPS) was studied using a TriboIndenter by employing a diamond tip with a 1 μm nominal radius of curvature. The Ni NDPS was fabricated by thermal evaporation of Ni through a porous anodized aluminum oxide (AAO) template onto a Si substrate. Surface morphology and the deformation of the NDPS were characterized by scanning electron microscopy (SEM) and atomic force microscopy (AFM), before and after friction/scratch testing. SEM images after scratching clearly showed that, similar to what was assumed at the macroscale, the frictional force is proportional to the real area of contact at the nanoscale. It was found that adhesion played a major role in the frictional performance, when the normal load was less than 20 μN and plastic deformation was the dominant contributor to the frictional force, when the normal load was between 60 μN and 125 μN. Surprisingly, a continuum contact mechanics model was found to be applicable to the nanoscale contact between the tip and the inhomogeneous Ni NDPS at low loads. The coefficient of friction (COF) was also found to depend on the size of the tip and was four times the COF between a 100 μm tip and the Ni NDPS. Finally, the critical shear strength of the Ni nanodots/Si substrate interface was estimated to be about 1.24 GPa.     

多孔氧化铝模板的制备研究

以草酸为电解液,采用二次阳极氧化法制备多孔有序氧化铝模板,研究了氧化电压、电解液浓度、去一次氧化膜时间和二次阳极氧化时间对多孔氧化铝膜结构的影响。结果表明,退火后在60V电压、0.6mol/L的草酸溶液中、去一次阳极氧化膜5h、二次阳极氧化15h制备的膜结构孔洞均匀有序、孔径达80nm、孔密度达8.2×109个/cm2。     

多孔氧化铝薄膜中罗丹明6G光学特性随光照时问的变化

实现了有机染料-无机载体复合材料中J聚合物向H聚合物的转变,并且证明了泵浦激光能够导致复合材料的荧光淬灭效应.研究了多孔氧化铝(AAO)薄膜中的罗丹明6G(Rh6G)分子在激光泵浦下的吸收谱和荧光谱随照射时间不同而产生的变化.结果显示,随着照射时间的增加,吸收谱和荧光谱的峰位均发生了不可逆的蓝移,并且发生了荧光淬灭现象...     

嘉兴联合污水处理厂提标改造工程设计及经验总结

嘉兴联合污水处理厂总规模为60×10^4 m^3/d,进水中工业废水比例约50%以上,污水厂分两期,一期工程(30×10^4 m^3/d)原采用初沉+氧化沟+二沉池的处理工艺,二期工程(30×10^4 m^3/d)原采用预曝气及初沉+水解酸化+AAO生反池+二沉池的处理工艺。本次提标将出水水质从《污水综合排放标准》(GB 8978-1996)的二级标准提高到《城镇污水处理厂污染物排放标准》(GB 18918-2002)的一级A标准。其中一期工程采用二级处理减量提标(新增二级处理部分采用了AAO和MBR两种工艺)并增加加砂高效沉淀池+滤布滤池+臭氧氧化的方案;二期工程采用在现有流程基础上增加加砂高效沉淀池+反硝化深床滤池+臭氧氧化的方案。本工程总投资为71915.67万元,提标后污水厂新增单位经营成本0.53元/m^3。本工程主体部分于2018年建成通水,一、二期出水水质均能稳定达到一级A标准的要求。     

交流电沉积制备SnO2纳米线及其电沉积条件研究

采用阳极氧化的方法制备了孔径为30～50nm多孔阳极氧化铝(AAO)模板,用交流(AC)电沉积法在氧化铝模板孔洞内沉积金属锡,然后在空气中750℃加热含锡的模板10h,热氧化制备了直径在30～50nm SnO2纳米线．用扫描电子显微镜,透射电子显微镜,X射线衍射仪对所制备的SnO2纳米线进行了表征,表明所制备的纳米线为多晶结构．并通过改变交流电沉积过程中的电压,频率和热氧化时间来考察不同沉积条件对沉积结果的影响,发现采用交流沉积制备金属纳米线的过程中,频率和电压是影响沉积结果的关键因素．     

Co88Ni12合金纳米线阵列的制备与磁性能表征

采用直流电化学沉积方法，在多孔阳极氧化铝模板的纳米级微孔内电沉积钴镍合金，制备出直径为30nm，长度为几个微米的准一维合金纳米线（阵列）材料；随后采用场发射扫描电子显微镜（FE-SEM），透射电子显微镜（TEM），X射线衍射仪（XRD），振动样品磁强计（VSM）对纳米线的形貌、结构及其磁性能进行了相关表征与测试．发现所制备的Co88Ni12合金纳米线表面光滑，粗细均一，具有较高的长径比；呈现密排六方结构（hcp），沿[100]择优取向生长，易磁化方向沿纳米线轴向方向．     

电化学模板法制备金属Ni纳米线阵列的研究

采用电化学模板法在恒电位（-0.8V）下沉积10h成功制备了磁性金属Ni纳米线及其阵列结构。利用SEM、TEM、XRD对其微观形貌和晶体结构进行了表征,结果表明,纳米线阵列规整,排列紧密,纳米线长48μm,直径300nm,长径比160,阵列刚性较大,没有发生倒伏;制得的Ni纳米线具有多晶的面心立方结构,晶面指数为（111）,（220）,（200）。通过控制电沉积的时间,制备出不同长度的Ni纳米线,分析了电沉积时间对纳米线长度的影响。