Experimental Investigation of Static Mechanical Properties of Epoxy Based Glass, Carbon & Sisal Woven Fabric Hybrid Composites

International audienceIn recent years, composite materials widely involved replacing the metals to increase the strength at minimal weight. Synthetic fiber reinforced polymer composites are widely used many application like aircraft, automobile etc. Due to increasing demand for the synthetic fiber, because of its light weight and easily biodegradable, Natural fiber are involved in achieving good strength to weight ratio. In present work sisal fiber reinforced polymer composite SFRP was used to replacing the two synthetic composite such as carbon fiber reinforced polymer composite CFRP and glass reinforced polymer composite GFRP. All laminates are fabricated by using hand layup method. The static mechanical properties of epoxy based SFRP, GFRP, CFRP and their hybrids laminates are experimentally evaluated as per ASTM standards and reported. Introduction. Investigated the mechanical properties of sisal, jute and glass fiber reinforced polyester composites observed that the addition of glass fiber into jute fiber composite resulted in maximum tensile strength and that jute and sisal mixture composites sample is capable having maximum flexural strength and maximum impact strength was obtained. [4]. The variation of tensile strength, flexural strength and compressive strength of epoxy based sisal-glass hybrid composites have observed that 2 cm fiber length hybrid composites showed maximum optimal tensile, flexural and compressive strength than 1 and 3 cm. The effect of alkali treated hybrid composites showed higher strength than untreated composites [2]. Increase in NaOH concentration worsens the tensile properties of the natural fiber and also higher concentration enhances the surface characteristics of the fiber by removing the waxy layer from the surface and the fiber matrix interfacial adhesion. So 6% NaOH is the optimum concentration which provides acceptable fiber strength and surface characteristics [8]. The application of composites in structural facilities is mostly concentrated on increasing the strength of the structure with the help of artificial fibers and does not address the issue of sustainability of these raw materials used for strengthening purposes [6]

Modified phyto-waste Terminalia catappa fruit shells: a reusable adsorbent for the removal of micropollutant diclofenac

This study investigated the preparation of a reusable adsorbent from the phyto-waste Terminalia catappa fruit shells by acid-thermal modification and utilization for the removal of diclofenac from aqueous systems. The structural characteristic features of the modified T. catappa fruit shells (MTCFS) were analysed using Scanning Electron Microscopy, Fourier Transform Infrared Spectroscopy and Brunauer-Emmett-Teller analysis. Batch experiments proved that temperature and pH mainly influenced the adsorption process. The Langmuir and Freundlich isotherms were obeyed for the diclofenac adsorption. The Temkin isotherm model revealed that increasing temperature affected the adsorption of diclofenac. The Dubinin-Radushkevich isotherm indicated that the present adsorption system was achieved through physical interactions. A pseudo-second-order kinetic model was well fitted for the diclofenac adsorption. Intraparticle diffusion results indicated increases in the rate of adsorption and in the boundary layer thickness. The thermodynamic results revealed that increasing the temperature inversely affected the diclofenac adsorption. Recycling experiments confirmed that the MTCFS were found to be quite stable and retained their adsorption efficiency for up to eight cycles of diclofenac removal

A Modified Three Leg Watkins Johnson Bridge Type DC to DC Converter Simulation and Experimental Verification

In this work, a novel, high boost, DC-to-DC converter topology is proposed and validated. The proposed topology is an extension of the existing two leg bridge type Watkins Johnson DC to DC converter. In the proposed system, an additional leg is included along with an additional inductor and an additional capacitor. The inclusion of the third leg to the existing, two-leg version of Watkins Johnson DC–to-DC bridge type converter helps to boost further the voltage gain. This paper presents the proposed topology and a detailed analysis of the topology using the circuit model in the MATLAB SIMULINK simulation environment. An experimental prototype was also developed to validate the proposed idea. The results obtained from the simulations and the experimental prototype are also presented herein. The studies were carried out with open loop configuration

Electrospun nylon 6,6 membrane as a reusable nano-adsorbent for bisphenol A removal: Adsorption performance and mechanism

Bisphenol A (BPA) is highly considered as an emerging contaminants (ECs) due to their endocrine disrupting and reproductive toxicant nature. It has been detected in drinking water sources in many countries. This study deals with the adsorptive removal of BPA using nylon 6,6 nanofibrous membrane (NNM) fabricated by electrospinning technique. Langmuir and Freundlich isotherm models (R2 = 0.99) were obeyed for BPA adsorption, which indicates the monolayer adsorption of BPA and also surface heterogeneity of NNM. The adsorption kinetics of BPA was followed pseudo second order rate (R2 = 0.89–0.99), which suggests the occurrence of rapid adsorption rate through interaction of surface functional groups present in NNM. The maximum adsorption of BPA (91.3 mg g−1) was attained at 30 °C. The hydroxyl groups of BPA form hydrogen bonding with carbonyl groups of NNM during the adsorptive removal process. Reusability study confirmed a much better stability of NNM in the recyclic application. Finally, this study suggests that NNM might be an outstanding nano-adsorbent for the emerging contaminants removal, including BPA from drinking water sources