Sami Ullah

Thermal performance of glass fiber reinforced intumescent fire retardant coating for structural applications

The results of influence of glass fiber addition into the basic intumescent coating formulation towards the enhancement of its thermal insulation properties are presented. The intumescent coatings were formulated from expandable graphite, ammonium polyphosphate, melamine, boric acid, bisphenol A epoxy resin BE-188, polyamide amine H-2310 hardener and fiberglass (FG) of length 3.0 mm. Eight intumescent formulations were developed and the samples were tested for their fire performance by burning them at 450°C, 650°C and 850°C in the furnace for two hours. The effects of each fire test at different temperatures; low and high temperature were evaluated. Scanning Electron Microscope, X-Ray Diffraction technique and Thermo Gravimetric Analysis were conducted on the samples to study the morphology, the chemical components of char and the residual weight of the coatings. The formulation, FG08 containing 7.0 wt% glass fiber provided better results with enhanced thermal insulation properties of the coatings.

CO2 Capture, Storage, and Enhanced Oil Recovery Applications

Abstract CO 2 -EOR gained the attention of industry as one of the most practical choices of oil recovery approaches. In addition to the oil production boost, enhanced oil recovery by means of CO 2 offers a channel to store the enormous volumes of CO 2 permanently under the subsurface in depleted crude oil reservoirs. Here we discussed the potential and operational mechanisms of CO 2 -EOR applications for trapped oil recovery as well as CO 2 sequestration.

Effects of Halloysite Nanotube Reinforcement in Expandable Graphite Based Intumescent Fire Retardant Coatings Developed Using Hybrid Epoxy Binder System

In this study, the effects of halloysite nanotubes (HNTs) reinforcement in expandable graphite based intumescent fire retardant coatings (IFRCs) developed using a polydimethylsiloxane (PDMS)/phenol BA epoxy system were investigated. Intumescent coating formulations were developed by incorporating different weight percentages of HNTs and PDMS in basic intumescent ingredients (ammonium polyphosphate/melamine/boric acid/expandable graphite, APP/MEL/BA/EG). The performance of intumescent formulations was investigated by furnace fire test, Bunsen burner fire test, field emission electron microscopy (FESEM), thermogravimetric analysis (TGA), transmission electron microscopy (TEM), and Fourier transform infrared analysis (FTIR). The Bunsen burner fire test results indicated that the fire performance of HNTs and PDMS reinforced intumescent formulation has improved due to the development of silicate network over the char residue. Improved expansion in char residue was also noticed in the formulation, SH(3), due to the minimum decomposition of char carbon. FESEM and TEM results validated the development of silicate network over char layer of coating formulations. A considerable mass loss difference was noticed during thermal gravimetric analysis (TGA) of intumescent coating formulations. Reference formulation, SH(0) with no filler, degraded at 300 °C and lost 50% of its total mass but SH(3), due to synergistic effects between PDMS and HNTs, degraded above 400 °C and showed the maximum thermal stability. XRD analysis showed the development of thermally stable compound mulltie, due to the synergism of HNTs and siloxane during intumescent reactions, which enhanced fire performance. FTIR analysis showed the presence of incorporated siloxane and silicates bonds in char residue, which endorsed the toughness of intumescent char layer produced. Moreover, the synergistic effect of HNTs, PDMS, and other basic intumescent ingredients enhanced the polymer cross-linking in binder system and improved fire resistive performance of coatings.

Impact of International Migration on Human Development: A South Asian Perspective

This study is going to empirically investigate the impact of international migration on human development in South Asian perspective because human development is the essential part for sustainable development by enhancing capabilities. For empirical investigation of the impact of international migration on human development in South Asian region, human development index of UNDP is taken as dependent variable and international remittances as independent variable and also used as proxy for international migration. To check robustness of the findings, different control variables are used for comprehensive model and policy recommendations. Control variables are selected on the basis of their theoretical justification and cover almost all sectors. Findings of this study guide us that if we want to use our remittances for the development and expansion of capabilities, then we should focus on political stability and institutional strength of this region. Empirics of this study are relevant for administrators, policy makers, social partners, media, and the researchers because they mainly focus on how best to address capability- based human development. At the end, policy makers should move away from a narrow perspective toward a wider perspective by understanding the valid reasons that can help in policy design that is supportive and effective for the well-being of the people of South Asia, which holds half of the world’s poor.

The effect of 150μm expandable graphite on char expansion of intumescent fire retardant coating

Intumescent is defined as the swelling of certain substances to insulate the underlying substrate when they are heated. In this research work the effect of 150μm expandable graphite (EG) was studied on char expansion, char morphology and char composition of intumescent coating formulations (ICFs). To study the expansion and thermal properties of the coating, nine different formulations were prepared. The coatings were tested at 500 °C for one hour and physically were found very stable and well bound with the steel substrate. The morphology was studied by Scanning Electron Microscopy (SEM). The char composition was analysed by X-ray Diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) techniques. EG above than 10.8wt% expands the char abruptly with uniform network structure and affect the outer surface of the char.