Advanced Materials and Processes Research Institute
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`The Uptake Capacity of Zn(II) by Natural Vietnamese Basalt and their Application for Wastewater Treatment’\ud
No full textAn Assessment of the Compressive Strength of Glass Reinforced Plastic Waste Filled Concrete for Potential Applications in Construction
No full textIn the United Kingdom, most glass reinforced plastic (GRP) waste is currently sent to landfill \ud
due to its intrinsic thermoset composite nature, lack of information relating to its characteristics \ud
and insufficient knowledge of potential recycling options. Experimental attempts were made to \ud
recycle GRP waste in concrete composites and cement. As such, more than 190 concrete \ud
specimens were prepared in accordance with BS EN12390-2:2000 and BRE 1988 mix design for \ud
normal concrete and used GRP waste powder content varying from 5% to 50% as replacement \ud
for fine aggregates. Results showed that GRP waste can be used as a partial replacement for fine \ud
aggregate as well as an admixture in cement concrete. Additionally, the presence of polymer and \ud
short glass fibre content in GRP waste powder can significantly contribute to improve the quality \ud
of various concrete products and has ample scope for use in several applications in the \ud
construction sector
Determination of Biogenic Amines in Lake Water by Micellar\ud Electrokinetic Chromatography with Fluorescence Detection\ud after Derivatization with Fluorescamine1.
No full textA simple and rapid method has been developed for the determination of biogenic amines in lake water using micellar electrokinetic chromatography with fluorescence detection. Separation of fluorescam�ine derivatized biogenic amines was accomplished by using borate buffer of pH 9.5 containing 40 mM of sodium dodecyl sulphate. The method has been optimized with respect to fluorescamine concentration,\ud
reaction pH, reaction time, separation voltage and injection time. Detection was performed by using UG�11 excitation filter and 495 nm emission filter. The proposed method for histamine, tyramine and dopamine allowed their separation within 2 min with detection limits in nM range. The interday and intraday reproduc� ibility of peak areas were less than 6.5%. Recovery of spiked samples was 95.76–116.31%
`Sequestration of Green House Gases (CO2) by Industrial Hazardous Waste’
No full textRed mud, an aluminium industry hazardous waste, has been reported to be an inexpensive and effective adsorbent. In the present work applicability of red mud for the sequestration of green house gases with reference to carbon dioxide has been studied. Red mud sample was separated into three different size fractions (RM I, RM II, RM III) of varying densities (1.5-2.2 g cm―3). Carbonation of each fraction of red mud was carried out separately at room temperature usinga stainless steel reaction chamber at a fixed pressure of3.5 bar. Effects of reaction time (0.5-12 h) and liquid to solid ratio (0.2-0.6) were studied for carbonation of red mud. Different instrumental techniques such as X-ray diffraction, FTIR and scanning electron microscope (SEM) were used to ascertain the different mineral phases before and after carbonation of each fraction of red mud. Characterization studies revealed the presence of boehmite, cancrinite, chantalite, hematite, gibbsite, anatase, rutile and quartz. Calcium bearing mineral phases (cancrinite and chantalite) were found responsible for carbonation of red mud. Maximum carbonation was observed for the fraction RM II having higher concentration of cancrinite. The carbonation capacity is evaluated to be 5.3 g of CO2/100g of RM II
Synthesis and characterization of nano-sized zirconia powder synthesized by single emulsion-assisted direct precipitation.
No full textor the first time, single reverse microemulsion-assisted direct precipitation route has been successfully used to synthesize tetragonal zirconia nanoparticles in narrow size range. The synthesized powder was characterized using FT-IR, XRD and HRTEM techniques. The zirconia nanoparticles obtained were spherical in shape and has narrow particle size distribution in the range of 13-31nm and crystallite size in the range of 13-23nm
Correlation of mechanical and tribological properties of organosilane modified cenosphere filled high density polyethylene.
No full textFlyash cenosphere obtained as industrial waste from thermal power plants is an effective cost and weight reducing filler for developing lightweight polymer composites. Cenospheres as fillers also help in improving the mechanical properties of base polymer matrices. However, the desired enhancement depends on homogeneous dispersion of cenospheres and excellent compatibility between cenospheres and polymer matrix. In the present work, this was achieved by modifying the surface of cenospheres using silane treatment and incorporating them in a versatile thermoplastic high density polyethylene. The silane treatment resulted in considerable improvement in the impact strength and density of the composites which ultimately translated into better wear performance of composites even in severe abrasive conditions. Lancaster–Ratner correlation between mechanical properties and wear resistance was found to be almost linear for the silane treated cenospheres filled composites unlike the untreated cenospheres filled composites. Scanning electron microscopy was used to understand the wear modes and mechanisms and supported using X-ray diffractograms
Preparation of poly(acrylonitrile)-grafted silk fibers with antibacterial properties.
No full textThis study is focused on investigating the feasibility of using silver(I) ions loaded poly(acrylonitrile)-grafted silk fibers as antibacterial dressing material. The optimum grafting conditions for ceric ammonium nitrate induced graft-copolymerization of acrylonitrile onto silk fibers were found to include initiator concentration of 35 mM, catalyst HNO3 concentration of 0.40 M and initiation time of 10 min. The poly(acrylonitrile)-grafted silk fibers were loaded with silver(I) ions by equilibration method. The resulting fibers were investigated for their biocidal action against E. coli, by using zone inhibition and colonies counting method
Investigation of Water Vapour Permeability and Antimicrobial Property of Zinc Oxide Nanoparticle Loaded Chitosan Based Edible Film
No full textThe study describes water vapour permeation and antibacterial properties of silver nanoparticles \ud
(SN) loaded cellulose acetate films. The water vapour permeability of plain cellulose acetate film was found to \ud
increase with temperature and activation energy for permeation (Ep) was found to be 46.28 kJ mol-1. In addition, \ud
increase in relative humidity also enhanced the permeability parameters of the plain cellulose acetate film. \ud
Similarly, use of poly ethyleneglycol (PEG) as plasticizer enhanced the water vapour transmission properties \ud
of films but it also produces adverse effect on mechanical properties of the films. The silver nanoparticles \ud
loaded films have been characterized by surface plasma resonance (SPR), X-ray diffraction, transmission \ud
scanning electron microscopy (TEM) and differential scanning calorimetry (DSC). The average size of the \ud
silver nanoparticles, as determined using Scherre’s equation, was found to be nearly 84nm. The film showed fair \ud
antibacterial activities against model bacteria E. coli. The moisture barrier action of cellulose acetate film was \ud
also tested, using grapes pulp as model substract. The grape pulp when entrapped within the cellulose acetate \ud
film, exhibited a slower moisture loss as compared to the pulp exposed to open air
Modified Johnson–Cook material flow model for hot deformation\ud processing.
No full textThe need of a generalised flow curves considering\ud
strain (e), strain rate (_e) and temperature (T) is a\ud
primary requirement for material modelling related to\ud
several conventional and strategic mechanical processing\ud
to meet critical and non-critical engineering applications.\ud
The realistic coefficients of flow curves need to be obtained for such model. In the present study a modified Johnson– Cook (JC) material model has been proposed with physical significance. Six constants of this model can be obtained through the regression analysis. When compared to the JC model, proposed model is found to be more reliable for Al-2024 alloy
Improvement of the mechanical properties of glass fibre reinforced plastic waste powder filled concrete.
No full textA comprehensive laboratory experiments were conducted to improve the mechanical properties of glass fibre reinforced plastic (GRP) waste powder filled concrete using superplasticiser for widening the scope for GRP waste recycling for different applications. It is imperative to note that the 28 days mean compressive strength of concrete specimens developed with 5–15% GRP waste powder using 2% superplasticiser resulted 70.25 ± 1.43–65.21 ± 0.6 N/mm2 which is about 45% higher than that of without the addition of superplasticiser (with GRP waste) and about 11% higher than that of the control concrete (without GRP\ud
waste) with 2% superplasticiser. The tensile splitting strength of the concrete showed 4.12 ± 0.05– 4.22 ± 0.03 N/mm2 with 5–15% GRP waste powder which is also higher than that of the control concrete (3.85 ± 0.02 N/mm2). The drying shrinkage, initial surface absorption and density of GRP waste filled concrete were evaluated and found better than the desirable quality for use in structural and non-structural applications