jrups
Abstract : Direct Impedimetric Detection and Isolation of Bacillus Cereus using Modified Platinum Electrode
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Abstract: This work proposes a technique for isolation of bacteria using magnetic nanoparticles. The magnetic nanoparticles that are prepared by a sol-gel method using citric acid and nano-ferrites are characterized for structural and morphology by X-ray diffraction (XRD) and Transmission electron microscope (TEM), respectively. The prepared nano-ferrites coated with poly vinyl alcohol (PVA) over platinum electrode are used for detection of Bacillus Cereus. The isolated bacterial cells from colloidal solution are treated with zinc ferrite for 12 h, and it is observed that the cells are coagulated with the nanoparticle when allowed to settle down. This is further filtered by different size of filter paper to get less than 0.1% of cells in water. Various electrochemical parameters like cyclovoltammetry (CV), sweep step function, Tafel plot, AC impedance are studied employing the modified platinum electrode. It is observed through CV graph that the peaks are formed at -0.25 V due to the oxidation of bacterial cells, which is further supported by sweep step function graph. Therefore, this is one of the economically efficient techniques to detect and isolate the Bacillus cereus from a colloidal solution. Keywords: Bacillus cereus, Magnetic nanoparticle, Cyclovoltammetry, Sweep step function. |
Abstract : Fabrication and Characterization of Antibacterial and Biodegradable Facial Tissue Papers Using Bio-Based Raw Materials: Effect of Glycerin
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Abstract: Antibacterial facial tissue papers were prepared by solution casting method with chitosan loaded bleached cellulosic pulp. Chitosan, in the film act as an antibacterial agent. Tissue paper films were fabricated by 50% cellulose and 50% chitosan (by weight, dry basis). Mechanical properties of the films were evaluated. It was found that tensile strength (TS) and elongation at break (EB) of the 50% chitosan contain films were 24 MPa and 10.8% respectively. To increase the plasticity of the tissue paper films glycerin was added 0.4 to 2% (by weight). It was found that with the incorporation of 1% glycerin in the tissue paper films the flexibility increased to 50%. Molecular interaction due to the chitosan addition was investigated by Fourier Transform Infra-Red (FTIR) spectroscopy. Water uptake property of glycerin contains films were also evaluated. In the soil medium, the degradation properties of the tissue paper films were carried out. The antibacterial property of the tissue paper was evaluated by disk diffusion method. Keywords: Bleached cellulosic pulp, Chitosan, Glycerin, Facial tissue, Antibacterial, Biopolymer, Biodegradable. |
Abstract : Using Riboflavin as Low Molecular Mass Gelator for the Preparation of a New Network Structure Having Spiroacetal Moieties
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Abstract: The present investigation presents the synthesis and properties of a new nanogel structure based on poly(itaconic anhydride-co-3,9-divinyl-2,4,8,10-tetraoxaspiro[5.5] undecane) and a low molecular mass gelator, namely riboflavin. The chemical structure of the new network system was confirmed by FTIR and 1H-NMR. The sensitivity of the new structures was evaluated by determining the hydrodynamic radius in interdependence with environmental conditions. The investigation was realized as nanogels are considered very attractive carrier systems owing to their nanometer-sized dimensions, which allow for holding large amounts of solvent and incorporating specific compounds in their nanoscale three-dimensional polymer networks. Keywords: Itaconic anhydride, spiroacetal moiety, riboflavin, low molecular mass gelator, polymer network. |
Abstract : A Review Study on the Traditional Machining of Composite Materials
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Abstract: Composite materials are widely used materials in many industrial applications due to their superior properties. Machining of composite materials is difficult to carry out due to the anisotropic and non-homogeneous structures of composites and are mostly prepared in laminate form before undergoing the machining process. Machining of these materials is inevitable although they are manufactured to near net shape. This becomes more important when new product designs and shapes poses tougher dimensional and performance constraints like surface finish, dimensional tolerances & material removal rate etc. Thus many researchers in the past have attempted to study the machining of composite materials to know the effect of various process parameters upon the quality of machining characteristics. In this paper an overview of the various issues involved in the machining of the main types of composite materials is presented. Literature review reveals that current research focuses on the traditional machining of glass and carbon fiber reinforced plastics to reduce or eliminate the problem of delamination and dimensional accuracy. Keywords: Machining, Turning, Grinding, Drilling, Composite Material. |
