A facile route for preparation of gradient wettability surface on copper substrate with contact angle changing from 90.3°to4.2°was developed.The Cu（OH）2 nanoribbon arrays were electrochemically deposited o...A facile route for preparation of gradient wettability surface on copper substrate with contact angle changing from 90.3°to4.2°was developed.The Cu（OH）2 nanoribbon arrays were electrochemically deposited on copper foil via a modified anodization technology,and the growth degree and density of the Cu（OH）2 arrays may be controlled varying with position along the substrate by slowly adding aqueous solution of KOH into the two-electrode cell of an anodization system to form the gradient surface.The prepared surface was water resistant and thermal stable,which could keep its gradient wetting property after being immersed in water bath at 100℃ for 10 h.The results of scanning electron microscopy（SEM）,X-ray diffraction（XRD） and X-ray photoelectron spectroscopy（XPS） demonstrate that the distribution of Cu（OH）2 nanoribbon arrays on copper surface are responsible for the gradient wettability.展开更多
通过对多年连作后发香蕉枯萎病土壤进行熏蒸处理,应用传统涂布计数法,结合变性凝胶电泳(Denaturing gradient gel electrophoresis,DGGE)技术,较为全面地研究了不同熏蒸剂对病原菌的杀灭效果以及对土壤微生物区系的影响,为连作蕉园的可...通过对多年连作后发香蕉枯萎病土壤进行熏蒸处理,应用传统涂布计数法,结合变性凝胶电泳(Denaturing gradient gel electrophoresis,DGGE)技术,较为全面地研究了不同熏蒸剂对病原菌的杀灭效果以及对土壤微生物区系的影响,为连作蕉园的可持续栽培提供了理论依据。试验通过研究石灰、碳铵、石灰碳铵联用、二氧化氯、次氯酸钠、过氧化氢和氨水处理对水体病原菌孢子、土壤中尖孢镰刀菌的杀灭作用,逐步筛选出适合连作蕉园灌溉水和土壤的熏蒸剂种类。结果表明:上述熏蒸剂对水体或土壤中尖孢镰刀菌均具有杀灭作用,土壤中氨水、石灰碳铵联用处理效果更加显著,被选择为发病蕉园土壤熏蒸剂。不同用量氨水、石灰碳铵联用处理熏蒸土壤,随着熏蒸剂施用量的增加,土壤中尖孢镰刀菌数量下降幅度逐渐增大;两种熏蒸剂对土壤中可培养总细菌和总真菌均有杀灭效果,随着用量的增加,总真菌数量下降幅度显著高于总细菌。DGGE结果显示,氨水、石灰碳铵联用处理对土壤中总真菌种类的影响也显著高于总细菌,随着熏蒸剂用量的增加,总细菌有少许条带的增加或减少,总真菌条带丰富度急剧减少。与对照相比,各熏蒸剂处理后总细菌物种多样性指数均有所降低,随着用量的增加,总体呈下降趋势,在氨水、石灰碳铵联用用量分别为2.67 ml/kg和(3.33+1.67)g/kg时各项指数最高。综上,所有熏蒸剂均能作为水体病原菌杀灭剂,其中氨水、石灰碳铵联用是良好的连作蕉园土壤熏蒸剂,最适用量分别为2.67 ml/kg、(3.33+1.67)g/kg。展开更多
基金Project(S2012010010417)supported by the Guangdong Natural Science Foundation,ChinaProject(20130172110008)supported by the Specialized Research Fund for the Doctoral Program of Higher Education of China
文摘A facile route for preparation of gradient wettability surface on copper substrate with contact angle changing from 90.3°to4.2°was developed.The Cu（OH）2 nanoribbon arrays were electrochemically deposited on copper foil via a modified anodization technology,and the growth degree and density of the Cu（OH）2 arrays may be controlled varying with position along the substrate by slowly adding aqueous solution of KOH into the two-electrode cell of an anodization system to form the gradient surface.The prepared surface was water resistant and thermal stable,which could keep its gradient wetting property after being immersed in water bath at 100℃ for 10 h.The results of scanning electron microscopy（SEM）,X-ray diffraction（XRD） and X-ray photoelectron spectroscopy（XPS） demonstrate that the distribution of Cu（OH）2 nanoribbon arrays on copper surface are responsible for the gradient wettability.
