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<!doctype html>
<html>
<head>
<title>Mamunia</title>
<meta charset="utf-8" name="viewport" content="width=device-width, initial-scale=1">
<link href="css/frame.css" media="screen" rel="stylesheet" type="text/css" />
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<link href="https://fonts.googleapis.com/css?family=Source+Sans+Pro:400,700" rel="stylesheet">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="js/menu.js"></script>
<style>
.menu-index {
color: rgb(255, 255, 255) !important;
opacity: 1 !important;
font-weight: 700 !important;
}
</style>
</head>
<body>
<div class="menu-container">
<div class="menu">
<div class="menu-table flex-row-space-between">
<div class="logo flex-row-center">
<a href="index.html">Mohammad Abdullah Al Mamun</a>
</div>
<a class="menu-button" tabindex="0" href="javascript:void(0)">
<img src="img/menu.png">
</a>
<div class="menu-items flex-row-center flex-item">
<a href="index.html" class="menu-index">Hello!</a>
<a href="research.html" class="menu-index">Research</a>
<a href="publications.html" class="menu-index">Publications</a>
<a href="blog.html" class="menu-index">Blog</a>
<a href="files/CV_Mamun.pdf" class="menu-index" target="_blank">CV</a>
<!--
<a href="widgets.html" class="menu-widget">Widgets</a>
<a href="embedding.html" class="menu-embedding">Embedding</a>
<a href="https://github.com/yenchiah/project-website-template">GitHub</a>
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</div>
</div>
</div>
</div>
<div class="content-container">
<div class="content">
<div class="content-table flex-column">
<div class="flex-row">
<div class="flex-item flex-column">
<h2 class="add-top-margin">Role of Oxygen Vacancies in Oxide based Dilute Magnetic Semiconductor (CeO<sub>2</sub> and TiO<sub>2</sub>)</h2>
<hr>
<p class="text">
Ti<sub>(1-x)</sub>M<sub>(x)</sub>O<sub>2</sub> and Ce<sub>(1-x)</sub>M<sub>(x)</sub>O<sub>2</sub> nanoparticles (NPs) have been synthesized
using sol – gel and hydrothermal chemical routes. Effect of heat treatment and doping of Transition and Rare Earth Metal ions on oxygen vacancy
concentration in these nanomaterials have been investigated. Structural properties were investigated using XRD, Raman, HR – TEM and XPS analysis.
Optical and Magnetic properties were investigated using UV – Vis and VSM analysis respectively. Photocatalytic dye degradation and hydrogen
production by water splitting are currently under investigation.
</p>
</div>
</div>
<div class="gallery">
<a href="javascript:void(0)" class="flex-column"><img src="img/PT600C.png">
<div>Rietveld Refinement of Pristine TiO<sub>2</sub> Annealed at 600 <sup>o</sup>C</div>
</a>
<a href="javascript:void(0)" class="flex-column"><img src="img/5_SmT700C.png">
<div>Rietveld Refinement of Ti<sub>0.95</sub>Sm<sub>0.05</sub>O<sub>2</sub> Annealed at 700 <sup>o</sup>C</div>
</a>
<a href="javascript:void(0)" class="flex-column"><img src="img/TEM1.jpg">
<div>HRTEM and corresponding FFT image of Ti<sub>0.95</sub>Sm<sub>0.05</sub>O<sub>2</sub> Annealed at 700 <sup>o</sup>C. Viewing through [010] zone axis</div>
</a>
<a href="javascript:void(0)" class="flex-column"><img src="img/TEM2.jpg">
<div>HRTEM and corresponding FFT image of Ti<sub>0.95</sub>Sm<sub>0.05</sub>O<sub>2</sub> Annealed at 700 <sup>o</sup>C. Viewing through [010] zone axis</div>
</a>
</div>
<div class="flex-row">
<div class="flex-item flex-column">
<h2 class="add-top-margin">Structural & Property Correlation with Cytotoxicity & Antibacterial Activity of Green Synthesized Nanoscale Materials</h2>
<hr>
<p class="text">
This research focuses on green synthesis of CeO<sub>2</sub> nanoparticles (NPs) by using Ce(NO<sub>3</sub>)<sub>3</sub>.6H<sub>2</sub>O and
aqueous leaf extract of <i>Artocarpus heterophyllus</i> as a bioreducing agent. The antibacterial activities of the NPs have been investigated
against two gram positive (<i>S. aureus</i> and <i>B. cereus</i>) and two gram negative bacteria (<i>E. coli</i> and <i>S. typhimurium</i>)
following disc diffusion assay. The cytotoxicity effect has been observed on two mammalian cell lines (HeLa and Vero). The structural
characteristics of the NPs were revealed by X – Ray Diffraction, Raman, and FT – IR analysis while the morphology of the NPs was characterized
by FESEM analysis.
</p>
</div>
</div>
<div class="gallery">
<a href="javascript:void(0)" class="flex-column"><img src="img/R1_1.jpg">
<div>Formation of CePO<sub>4</sub></div>
</a>
<a href="javascript:void(0)" class="flex-column"><img src="img/R1_4.jpg">
<div>FESEM image of NPs (Inset: grain size distribution estimated by using ImageJ software)</div>
</a>
<a href="javascript:void(0)" class="flex-column"><img src="img/R1_3.jpg">
<div>M-H Plots taken at 80, 200 and 300 K.</div>
</a>
<a href="javascript:void(0)" class="flex-column"><img src="img/R1_2.jpg">
<div>Antibacterial activities of CeO<sub>2</sub>-CePO<sub>4</sub> NPs were investigated by studying Zone of Inhibition analysis.</div>
</a>
</div>
<div class="flex-row">
<div class="flex-item flex-column">
<h2 class="add-top-margin">Investigation of lattice distortion in BiVO<sub>4</sub></h2>
<hr>
<p class="text">
Pure monoclinic & doped BiVO<sub>4</sub> were successfully synthesized by hydrothermal technique. We reported that 10% Nd doping at dodecahedral
site has no effect on the lattice distortion but 10% Mn doping at tetrahedral site slightly distorted the lattice structure of BiVO<sub>4</sub>.
From previous reports, it's well proved that monoclinic BiVO<sub>4</sub> has lower bandgap due to the lattice distortion than tetragonal
BiVO<sub>4</sub>. We recommended that variation in Mn doping percentage can be carried out to investigate the lattice distortion as well as
lower bandgap of BiVO<sub>4</sub>.
</p>
</div>
</div>
<div class="gallery">
<a href="javascript:void(0)" class="flex-column"><img src="img/R3_1.jpg">
<div>Schematic Crystal Structure of BiVO<sub>4</sub></div>
</a>
<a href="javascript:void(0)" class="flex-column"><img src="img/R3_2.jpg">
<div>FESEM image of NPs</div>
</a>
<a href="javascript:void(0)" class="flex-column"><img src="img/R3_3.jpg">
<div>FESEM image of NPs</div>
</a>
<a href="javascript:void(0)" class="flex-column"><img src="img/R3_4.jpg">
<div>Estimated Bandgap</div>
</a>
<a href="javascript:void(0)" class="flex-column"><img src="img/R4_0.jpg">
<div>XRD Patterns of BiVO<sub>4</sub> synthesized at different pH conditions</div>
</a>
<a href="javascript:void(0)" class="flex-column"><img src="img/R4_5.jpg">
<div>Effect of pH variation on %Phase</div>
</a>
<a href="javascript:void(0)" class="flex-column"><img src="img/R4_6.jpg">
<div>FESEM image of NPs</div>
</a>
<a href="javascript:void(0)" class="flex-column"><img src="img/R4_1.jpg">
<div>Diffused Reflectance Spectra of NPs</div>
</a>
</div>
</div>
</div>
</div>
</body>
</html>