Advanced Materials and Processes Research Institute
Advanced Materials and Processes Research Institute, BhopalNot a member yet
809 research outputs found
Sort by
THERMOMECHANICAL BEHAVIOR OF SISAL FIBERS GRAFTED WITH POLY(ACRYLAMIDE-CO-N-VINYL-2-PYRROLIDONE) AND LOADED WITH SILVER IONS OR SILVER NANOPARTICLES
No full textThe graft copolymerization of acrylamide, N-vinyl-2-pyrralidone and N, N'-methylene-bis-acrylamide was carried out to modify the sisal fiber to improve its mechanical and thermal stability. The grafting of poly-(acrylamide-co-N-vinyl-2-pyrrolidone) on sisal fiber surfaces facilitated the loading of Ag(I) ions and Ag(0) nanoparticles. Surface microstructure of the surface modified sisal fiber confirmed the grafting of the copolymer. The XRD and FTIR graphs also showed changes on grafting and on Ag(I) ions and the loading of Ag(0) nanoparticles. It is evident from the DSC curves that the initial thermal stability was improved by delaying the hemicellulose decomposition on grafting and silver ion loading
Thermomechanical Behaviour of Sisal Fibres Grafted with Poly(Acrylamide-Co-N-Vinyl-2-Pyrrolidone) and Loaded with Silver Ions or Silver Nano Particles
No full textThe graft copolymerization of acrylamide, N-vinyl-2-pyrralidone and N, N’-methylene-bis-acrylamide was carried out to modify the sisal fiber to improve its mechanical and thermal stability. The grafting of poly-(acrylamide-co-N-vinyl-2-pyrrolidone) on sisal fiber surfaces facilitated the loading of Ag(I) ions and Ag(0) nanoparticles. Surface microstructure of the surface modified sisal fiber confirmed the grafting of the copolymer. The XRD and FTIR graphs also showed changes on grafting and on Ag(I) ions and the loading of Ag(0) nanoparticles. It is evident from the DSC curves that the initial thermal stability was improved by delaying the hemicellulose decomposition on grafting and silver ion loading
'Role of schorl's electrostatic field in discoloration of methyl orange wastewater using schorl as catalyst in the presence of H2O2’\ud
No full textDyeing wastewater containing methyl orange (MO) could be effectively discolored by schorl-catalyzed Fenton-like system. Experimental results indicated that the MO discoloration ratios could be increased by increasing schorl dosage, temperature, initial H2O2 concentration, and by decreasing solution pH. When the raw schorl and the schorl samples sintered at 750°C, 850°C, 950°C and 1050°C were used as catalyst in Fenton-like system, the MO discoloration ratios obtained were 82%, 31%, 30%, 31% and 7%, respectively. XRD results showed that samples sintered at 750°C, 850°C and 950°C had no change in structure and still held the crystal structure of schorl and quartz, but, the content of schorl crystal decreased. Whereas, schorl\ud
crystal completely disappeared in the sample sintered at 1050°C and two new crystal phases of hematite and spinel were formed, which resulted in disappearance of the spontaneous ‘electrostatic poles’. Hence, it was inferred that the electrostatic field of schorl crystal could enhance the MO discoloration by schorl-catalyzed Fenton-like reaction
Sliding wear resistance of Al-alloy particulate composites : Anassessment on its efficacy.
No full textOne of the advantages reported in Al-base alloy particulate composites is its improved sliding wear properties over its base alloy by several investigators. Much of the improvement depends on the experimental conditions, alloy composition as on the particulate size, shape and distribution in the matrix. The present paper will make an attempt to assess the improvement in sliding wear properties attained in a few Aluminium base alloys with different size, quantity and distribution of SiC-particulates and bring out the efficacy of making composites if any in the different alloy systems over other methods of property improvement like homogenisation, secondary processing, etc. In some cases remarkable improvements have been achieved, such as the composites have sustained much harsher conditions whereas the base alloy has seized at much milder conditions; whereas in other alloy systems the improvement is only comparable to that obtained by secondary processing. Properties attained on homogenisation, extrusion and making composites would be compared with the base alloys. In this paper an attempt will be made to draw a line as to the conditions under which composites can been used to make engineering products where improved sliding wear resistance is demanded and where more prevalent methods like ageing could serve the purpose
Sequestration of carbon dioxide (CO2) using red mud.
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,RMII,RMIII) of varying densities (1.5–2.2 g cm−3). Carbonation of each fraction of redmud wascarried out separately atroomtemperature using a stainless steel reaction chamber at a fixed pressure\ud
of 3.5 bar. Effects of reaction time (0.5–12 h) and liquid to solid ratio (0.2–0.6) were studied for carbonation\ud
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\ud
RM II having higher concentration of cancrinite. The carbonation capacity is evaluated to be 5.3 g of\ud
CO2/100 g of RM II
Gradientless shape optimization using artificial neural networks.
No full textIn this paper a new zero order method of structural shape optimization, in which material shrinks or grows perpendicular to the design boundary, has been proposed in order to satisfy fully stressed design criteria. To avoid\ud
mesh distortion that results in undesirable shape, design\ud
element concept and for nodal movement and convergence checking, fuzzy set theory have been used. To accelerate\ud
the convergence, artificial neural networks are employed.\ud
The proposed approach, named as GSN technique, has been incorporated in a FORTRAN software GSOANN. Using this software shape optimization of four structures are carried out. It is demonstrated that proposed technique overcomes most of the shortcomings of mundane zero order methods
Investigation of Water Vapor Permeability and Antimicrobial Property of Zinc Oxide Nanoparticles-Loaded Chitosan-Based Edible Film.
No full textThis study is focused on the investigation of moisture uptake properties of chitosan films. The GAB isotherm model is found to fit well to the experimental moisture uptake data obtained at 10, 25, and 37�C. The water vapor permeability is found to increase with temperature.\ud
The use of plasticizer enhances the water vapor\ud
permeability. Finally, the films have been loaded with ZnO nanoparticles and characterized by X-ray diffraction,\ud
differential scanning calorimetry, surface plasma resonance,\ud
and scanning electron microscopic analyses. The crystal size as determined using Scherrer’s equation is found to be around 15 nm. The films have shown excellent antibacterial action against the model bacterium Escherichia coli
Water Sorption Properties and Antimicrobial Action of Zinc Oxide Nanoparticles-Loaded Cellulose Acetate Films.
No full textIn this work, ZnO nanoparticles loaded cellulose acetate (ZOLCA) films have been prepared and characterized by XRD, SPR and SEM analysis. The moisture permeation properties of the films have been investigated. The GAB isotherm model has been found to fit well on the moisture uptake data obtained at different temperatures. The monolayer sorption capacity χm was found to decrease from 0.059 to 0.0079 g water/g dry film with increase in temperature from 20 to 37°C. The isosteric heat of sorption, when studied in the lower water activity range of 0.04 to 0.10, was evaluated to be 46.55 to 87.29 kJ/mol. The water vapor permeability across the ZOLCA films was found to increase with temperature and activation energy of moisture sorption process was found to be 48.57 kJ/mol. These films have shown excellent antibacterial action against model bacteria E-Coli when investigated by qualitative and quantitative methods. Films exhibit great potential to be used as edible films to protect food stuff against microbial infections
Application of Neural Networks in Preform Design of Upsetting Process Considering Varying Interfacial Frictional Conditions
No full textUsing large deformation FEM analyses in SA333Gr.6 carbon steel material, the present study demonstrated the assessment of SZWc value that leads to JSZWc and finally compares with the respective experimental results. It also includes numerical prediction of specimen J–R curve using Gurson–Tvergaard–Needleman parameters obtain from tensile specimen tests. Using numerically predicted results, the crack initiation and instability stages in circumferentially through-wall cracked elbows is finally predicted and compares with experimental results. The present study gives evidence that the non-linear FEM analysis supported with proper tensile test data can be helpful in assessing the safety of bend pipes with through-wall crack
