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Subhadip Mondal,나창운,Sarbaranjan Paria,한은정,안대준,김해란,김수현,강다원 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
Excellent electromagnetic interference (EMI) shielding ability, lightweight, and good electrical conductivity are highly required for practical applications of EMI shielding materials, such as in areas of aerospace, aircraft and automobiles. In this work, a polyvinyl alcohol (PVA) based EMI shielding materials containing ketjen carbon black (K-CB) was prepared via solution mixing method. The morphological investigation shows the good dispersion and compatibility of K-CB in PVA matrix which leads to enhanced the thermal durability, EMI shielding efficiency and electrical conductivity. The prepared composites show low percolation threshold and promising high EMI shielding value of 28.4 dB for 10 wt% K-CB in X-band frequency. Those properties suggest that PVA/K-CB composites can be suitable for EMI shielding material particularly when lightweight, mechanically robust, and electrically conductive shield materials are required.
Ghosh, Chinmay,Mondal, Sutapa,Khan, Subhadip The Kangwon-Kyungki Mathematical Society 2021 한국수학논문집 Vol.29 No.1
In this paper we introduce generalised logarithmic proximate order, generalised logarithmic proximate type of an entire function and prove the corresponding existence theorems. Also we investigate some theorems on the application of generalised logarithmic proximate order.
Sayan Ganguly,Subhadip Mondal,Poushali Das,Poushali Bhawal,Tushar Kanti Das,Sabyasachi Ghosh,Sanjay Remanan,Narayan Chandra Das 한국고분자학회 2019 Macromolecular Research Vol.27 No.3
Dispersion of graphene as nano-building block in polymer matrix is challenging for developing high strength polymer nanocomposites. Tuning of surface polarity can be an effective pathway to resolve this issue of dispersion. Besides this, the polymer matrix (Ethylene methyl acrylate or EMA) has been chosen here judicially due to its polar-nonpolar alternating copolymeric segments which indirectly facilitated dispersion of nanofillers. Herein, graphene oxide has been lyophilically modified by virtue of surface grafting phenomenon with the help of di-halo substituted silane. The most surprising outcome which has been nurtured is their superior dispersion, improvement in physico-mechanical features, and transparency without affecting the inherent compliance of pristine polymer. The transmission electron microscopic image of silane functionalized graphene oxide (GOF) is showing surface roughness which has immense effect of physisorption and mechanical anchoring of polymer chains over GOF nano-sheets. Such physical interaction has enough impact on mechanical properties which has been discussed here. Moreover, the deterioration of transparency was not so much affected after loading of GOF filler. The filler distribution also has been confirmed in the light of small angle X-ray scattering (SAXS) study. Thermal treatment has been conducted for composites which accounted high thermal stability comparatively to pristine polymer.
Sabyasachi Ghosh,Subhadip Mondal,Sayan Ganguly,Sanjay Remanan,Nikhil Singha,Narayan Ch. Das 한국섬유공학회 2018 Fibers and polymers Vol.19 No.5
Herein, an intelligent cotton fabric was fabricated using a non-ionic surfactant based macro structured carbonaceous coating through the ‘knife-over-roll’ technique. The developed novel fabric was tested as flexible, mechanically robust with prolonged chemical/moisture resistance. Various characterization techniques were thoroughly used to analyze the fabric. The as-prepared fabric shows an outstanding electromagnetic interference (EMI) shielding efficiency (SE) of about 21.5 dB even at the lowest possible coating thickness (0.20 mm) where the highest EMI SE of 30.8 dB is obtained at only 0.30 mm coating thickness over the X-band frequency range (8.2-12.4 GHz), possibly due to the threedimensionally interconnected network structure of conducting carbon particles. The micro-computed tomography disclosed the porous architecture and “void-filler” arrangement within the fabrics. For the betterment of serviceability and practicability of the coated fabric, the water tolerance and contact angle studies were conducted. The relatively high contact angle than pure cotton fabric, and excellent water resistance after coating ensure improved endurance for external or industrial uses. Therefore, this proof-of-construct manifests commercialization of the developed fabric for multipurpose applications in a facile, less-hazardous and economical way.