http://210.212.227.212:8080/xmlui/handle/123456789/57 2026-05-17T00:01:38Z 2026-05-17T00:01:38Z Mubarak, Ali Aju Kumar, V N http://210.212.227.212:8080/xmlui/handle/123456789/132 2022-03-23T09:57:55Z 2021-01-01T00:00:00Z

Influence of cryogenic and chemical treatment on thermal and physical properties of hemp fabric Mubarak, Ali; Aju Kumar, V N Conventional synthetic materials in engineering applications are imprinting our ecosystem with non-biodegradable wastes. Environmental awareness throughout the world has influenced materials design and selection, which is leading to orientation from synthetic to bio- degradable materials. Efforts are put to improve the properties of existing natural materials for engineering applications. In this study hemp fabric was subjected to alkalization, maleic anhydride treatment and cryogenic treatment, to improve the fabric’s physiochemical properties. Differential scanning calorimetry (DSC), Thermo gravimetric analysis (TGA), and Differential Thermo gravimetric Analysis (DTG) were used to investigate the changes in thermal behaviour of untreated and treated fabric. Physical properties such as functional groups of fabrics were studied and compared with Fourier Transform Infrared Spectroscopy (FTIR).Alkalization and maleic anhydride treatment on fabric have substantially increased the number of hydrogen bonding in cellulose, which lead to increase in stiffness of the fabric. Thermal stability of hemp fabric has increased significantly with cryogenic treatment. An increase in the cellulose composition after the cryogenic treatment shows better physical properties. These observations give hemp fibbers wide range of opportunity to be part of engineering applications with thermal stability, stiffness, and eco-friendly requirements.

2021-01-01T00:00:00Z Mubarak, Ali http://210.212.227.212:8080/xmlui/handle/123456789/131 2022-03-23T08:45:25Z 2020-01-01T00:00:00Z

Composite scaffolds in tissue engineering Mubarak, Ali Along with growth and development, the technology has also brought us accidents, ailments and diseases. Tissue loss is one of the problems resulting from these. The existing treatments like transplants, surgical repair etc. do not hold well as a permanent cure and they often require painful surgical procedures. Considering other alternatives like tissue engineering and regenerative medicine practices, they focus primarily on permanent cure. Current strategies of regenerative medicine are focused on the restoration of pathologically altered tissue architectures by transplantation of cells in combination with supportive scaffolds and biomolecules. In recent years, considerable interest has been given to biologically active scaffolds which are based on similar analogs of the extracellular matrix that have induced synthesis of tissues and organs. The application of different composites in the field of tissue engineering increased the scope and efficiency of tissue engineering field

2020-01-01T00:00:00Z Mubarak, Ali http://210.212.227.212:8080/xmlui/handle/123456789/130 2022-03-22T11:15:12Z 2021-10-20T00:00:00Z

Chitosan-reinforced nitrile rubber – a step towards sustainable development Mubarak, Ali This work aims to investigate the effect of chitosan powders on the mechanical, morphological and thermal behaviour of nitrile rubber (NBR). The chitosan content has been varied between 0 and 15 phr. NBR was initially loaded with chitosan using a two-roll mixing mill along with compounding agents and then cured by compression moulding using accelerated sulphur vulcanisation strategy. The results indicate that the mechanical properties of NBR increase at a critical loading of chitosan (12 phr). A new Chitosan Efficacy Index has been proposed to understand the effect of chitosan loading on overall mechanical properties. Morphological examinations by using scanning electron microscopy pointed towards the presence of voids and discontinuities within the fractured surfaces of the composites. Thermogravimetric analysis and water absorption studies have also been carried out to complement the results from the investigation of mechanical properties.

2021-10-20T00:00:00Z Baiju, V Faras, Junaid P http://210.212.227.212:8080/xmlui/handle/123456789/122 2022-03-07T06:32:23Z 2021-12-06T00:00:00Z

Numerical investigations of thermal performance enhancement in phase change energy storage system effective for solar adsorption cooling systems Baiju, V; Faras, Junaid P Solar cooling systems requires an uninterrupted heat input for their continued operation. Thermal energy storage systems using phase change material (PCM) has the ability to deliver heat near isothermally and are effective for solar cooling applications. But these high energy dense storage systems exhibits poor thermal performance due to the low thermal conductivity of PCMs and are bulky. The main objective of this study is to design a phase change energy storage system (PCES) unit with different fin configurations, and to select a proper PCM for solar adsorption cooling systems (SAC). It projects the Preference Selection Index (PSI) method as the effective way to select the PCMs, and the result suggests the commercial PCM SavE-HS89 as a potential candidate among the different materials considered. This study also numerically investigates the thermal performance of different fins shapes, namely, positively tapered, negatively tapered and straight fins; among these the negatively tapered fins are found to be capable of compensating the slow melting process at the bottom region of the storage unit. It has been found that the negatively tapered fin improves the thermal performance of the PCES unit by reducing the melting time by up to 13% and 36% in comparison with the conventional straight fin and positively tapered fin, respectively. A case study of actual plant data of a SAC with different fin shapes shows that the storage system with the desirable configuration can save up to 46% of heat storage cost as compared to PCES without fin.

2021-12-06T00:00:00Z