Cover Page September-2019-Advanced Materials Letters

Advanced Materials Letters

Volume 10, Issue 9, Pages 637-642, September 2019
About Cover

Materials modelling has established itself as an essential analysis not only to study the insight of complex physical phenomena appearing in the soft or condensed matter but also to realize the emerging trend of 'reverse engineering' as a keystone for technological innovations. The cover photo of this September 2019 issue describes the bio interaction between graphene and enzyme protein for bioelectronics applicable in battery, fuel cell and biosensing applications and dedicated to celebrating the 6th anniversary of Nobel Prize in Chemistry on “Multiscale models for complex chemical systems”.


Functionalized Nano Carbon for excellent Microwave Absorption at GHz Frequency

Avanish Kumar Srivastava, Bhumika Samaria, Smita Soni, Anuj Shukla*, Umesh Kumar

Material Development Group, Defence Laboratory, Jodhpur 342011, India

Adv. Mater. Lett., 2019, 10 (9), pp 637-642

DOI: 10.5185/amlett.2019.0027

Publication Date (Web): May 20, 2019

Corresponding author: Tel: (+91) 2912511363; Fax: (+91) 2912510260; E-mail: anuj.shukla@dl.drdo.in; avanish@dl.drdo.in

Abstract

In the present study, nano carbon (NC) was chemically functionalized by refluxing in nitric acid for 6 h to form acid functionalized NC (FNC). TEM, XRD, FTIR, Raman, N2 BET surface area and dc electrical conductivity characterizations confirm the functionalization and formation of surface oxygen functional groups, which in turn increase the hydrophilicity of FNC, thus rendering them solution processable. The basic framework of NC did not get change as confirmed from different characterization techniques. FNC were dispersed in an epoxy matrix by a solution blending method with different FNC loading levels (5, 7.0, 10, 12& 15 wt %). The FNC/epoxy composites were studied for electromagnetic properties in 8-12 GHz. Electromagnetic properties such as real and imaginary part of dielectric permittivity found increasing with increase of FNC loading. Reflection loss result of 10wt % of FNC composite shows RL >10 dB from 9.5 to12.0 GHz (absorption bandwidth~ 2.5 GHz) and effective absorption bandwidth (RL> 5dB) ~ 7 GHz (8-15 GHz).  As a kind of potential microwave absorption material, the FNC composites are light weight and show excellent microwave absorbing ability. © VBRI Press.

Keywords

Nano carbon, composite, dielectric loss, microwave absorption, lightweight absorber.

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