在“草酸-碳纳米点物质”电解液中制备阳极氧化铝膜

K. Kudelko, L. Rozhdestvenska, L. Ponomarova, V. M. Оgenko
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引用次数: 0

摘要

阳极多孔氧化铝在纳米结构、涂层、模板等方面得到了广泛的应用。多孔阳极氧化氧化铝可以被描述为许多六边形的细胞,看起来像细胞结构。本文报道了用“草酸电解质-碳纳米点物质”电解铝的研究结果。采用铝支撑阳极氧化铝膜;后处理采用煅烧法。铝基板允许人们将膜固定在细胞中。方法:在0.3M草酸中加入碳纳米点胶体体系进行阳极氧化,工艺温度控制在10℃范围内,采用铝箔(阳极)和铂板(阴极);铝箔厚度为0.1µm;用电子扫描显微镜观察了阳极氧化铝膜的形貌和结构;用“滴法”测量了阳极氧化铝膜表面与去离子水的接触角。用电导仪监测钙含量。用光度法(显微洛瑞法)测定蛋白质含量。结果表明,在“草酸-碳纳米点物质”电解液中制备的阳极氧化铝膜表面与去离子水的接触角为38度。在酸性电解液中加入碳纳米点胶体体系,起到亲水剂的作用,改变了多孔表面的大小,从而可以控制薄膜的孔隙率。在500摄氏度下煅烧阳极氧化铝膜会导致孔壁膨胀和变薄。对阳极氧化铝膜透析分离乳清进行了试验研究。与在草酸电解质中获得的类似膜相比,在“草酸-碳纳米点物质”电解质中获得的膜对蛋白质颗粒的排斥程度更高。在酸性电解液中使用碳纳米点具有合成简单、环境友好的优点。这种方法,包括添加碳纳米材料的胶体系统,允许人们避免使用强酸性电解质来获得具有较小孔隙的膜。阳极氧化铝膜的一种应用方法是对乳清等生物液体进行透析。
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Anodic aluminum oxide-membrane prepared in electrolyte “oxalic acid – matter with carbon nanodots”
Anodic porous alumina has been studied and used as nanoscale structure, coating, template in different applications. The porous anodic alumina oxide could be described as numerous hexagonal cells and looks like cellular structure. In this work we report about results of study anodizing of aluminum with usage of electrolyte: “oxalic acid electrolyte-matter with carbon nanodots”. It was received anodic aluminum oxide-membrane with aluminum supporting; calcination was used as post treatment. The aluminum substrate allows one to fix the membrane in the cells. Methods: processes of anodizing was provided in 0.3M oxalic acid with addition of colloid system of carbon nanodots, temperature of process was controlled at range of 10 degree Celsius, aluminum foil (anode) and platinum plate (cathode) were used; thickness of aluminum foil was 0.1 µm; morphology and structure of anodic aluminum oxide-membrane were determined with usage of electron scanning microscope; the contact angle between the surface of anodic aluminum oxide-membrane and deionized water was measured with “drop” methodology. Calcium content was monitored with a conductometer. The content of proteins was determined with photometry (micro Lowry’s method). It was found that contact angle of the surface of anodic aluminum oxide-membrane obtained in electrolyte “oxalic acid-matter with carbon nanodots” and deionized water is 38 degrees. Adding colloidal system of carbon nanodots to the acid electrolyte acts as a hydrophilizer, changes the size of the porous surface: as a result, it is possible to control the porosity of the films. Calcination of anodic aluminum oxide-membrane at 500 degree Celsius lead to expansion and thinning of pore walls. Anodic aluminum oxide-membrane was tested for dialysis process for milk whey separation. The membrane obtained in electrolyte: “oxalic acid-matter with carbon nanodots” showed a greater degree of rejection of protein particles in comparison with a similar membrane obtained in electrolyte of oxalic acid. The advantage of using carbon nanodots in acid electrolyte is the simplicity and environmental friendliness of the synthesis. The approach, which involves the addition of a colloidal system with carbon nanomaterial, allows one to avoid using a strongly acidic electrolyte for obtaining membranes with smaller pores. One of the ways for using of anodic oxide aluminum-membrane is the dialysis of biological fluids, for example, milk whey.
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