Research List

No.	Researcher	Title	Abstract	Year
1541	Zar Chi Myat Mon	ELECTRICAL AND OPTICAL PROPERTIES OF LaCo0.6Fe0.4O3 NANOCRYSTALLINE POWDER BY SOL-GEL METHOD	A facile transition metal Fe doping has been employed as an effective approach to alter the electrical and optical properties of LaCoO3. The aim of the research work is to study the effect of sintering temperature on structure, electrical and optical properties of the nanocrystalline ceramics. LaCo0.6Fe0.4O3 nanocrystalline ceramics was prepared from constituent metal nitrates, citric acid and ethylene glycol by sol-gel method and sintered at different temperatures. The LaCo0.6Fe0.4O3 powder calcined at 600 �C were made circular pellets. The pellets were sintered at 800 �C, 900 �C and 1000 �C. The obtained ceramic pellet samples were characterized by X-Ray Diffractometer (XRD), Fourier Transform Infra-Red (FT IR) spectrometer and Scanning Electron Microscopy (SEM). The XRD results show all LaCo0.6Fe0.4O3 samples have hexagonal crystalline structure with R-3c space group and show single phase. The average crystallite size of the pellet samples varied from 20 to 40 nm due to the growth of nanocrystals at higher temperatures. The respective metaloxygen stretching vibrations of the prepared samples were observed in FT IR spectra. Surface morphology of the prepared ceramics were studied by SEM. The optical properties of LaCo0.6Fe0.4O3 ceramic samples were studied from UV-visible spectrophotometer and the optical band gaps were also estimated by using Tauc�s relation. The band gap values of the pellet samples were 2.2 eV, 2.1 eV and 2.0 eV, respectively and these values were within semiconductor band-gap range. The ac conductivities and dielectric properties were studied by LCR meter in the frequency range of 1MHz - 2MHz. The experimental results indicated that the dielectric loss factor (tan ?), dielectric constant (??), ac conductivity (?ac), resistivity (?) and dc conductivity (?dc) were found to depend on the frequency.	2021
1542	Aung Than Htwe	SYNTHESIS AND CHARACTERIZATION OF CHITOSAN BASED GRAPHENE OXIDE BIONANOCOMPOSITE	Nowadays, several biomaterials, including natural polymers, are used to solve and reduce the global problem of water pollution and biomedical as cellular interactions. Chitosan (CS) is one of the most studied biocompatible natural polymers. Graphene oxide (GO) is carbon-based nanomaterial capable of imparting desired properties to the scaffolds. In the present study an ecofriendly approach led to the development of biodegradable chitosan based graphene oxide bionanocomposites which have been prepared by the mixing aqueous solution of chitosan and graphene oxide. The synthesized GO and CSGO were characterized by using fourier transform infrared spectroscopy (FT IR), thermogravimetric/differential thermal analysis (TG-DTA), X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), UV-Vis spectroscopy. Finally, the synthesized nanoparticles size and surface charge were measured by dynamic light scattering (DLS) and zeta potential analyzer, respectively. The results obtained from those different studies revealed that chitosan and graphene oxide could mix with each other homogeneously. Hence, chitosan based graphene oxide bionanocomposite were successfully synthesized and characterized.	2021
1543	Daisy	TAMARINDUS INDICA MEDIATED SYNTHESIS OF COPPER (II) OXIDE NANOPARTICLES AND STUDY ON ITS PHOTOCATALYTIC DEGRADATION OF ALIZARIN AND MALACHITE GREEN DYES	The present study deals with the synthesis of copper(II) oxide nanoparticles (CuO NPs) by using aqueous solution of copper(II) nitrate and leaves extracts of Tamarindus indica L. (Ma-Gyi). Characterizations of the CuO NPs were made by Thermogravimetric-Differential Thermal Analysis (TG-DTA), X-ray diffraction (XRD), Fourier Transform Infrared spectroscopy (FT IR), Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM). CuO nanoparticles were indexed as monoclinic with average crystallite size of 19.9 nm. The presence of characteristic vibration of Cu-O in the range of 430-606 cm-1 was confirmed by FT IR analysis. Photocatalytic degradation of alizarin and malachite green dyes by CuO NPs under sunlight was conducted. Highest degradation percentages of alizarin and malachite green were attained at 0?3 g dosage of CuO NPs for 120 min? Treatment of wastewater from textile dye factory with the CuO NPs was performed and 99.13 % of the colour was removed after 8 days.	2021
1544	Khin Sandar Linn	EXTRACTION AND KINETIC PROPERTIES OF PEROXIDASE FROM BITTER GOURD	Peroxidase (PODs, E.C.1.11.1.7) catalyzes the oxidation of H2O2 and guaiacol forming the product tetraguaiacol and water. In this study partially purified peroxidase enzyme was extracted from fresh bitter gourd by ammonium sulphate precipitation method. Guaiacol was used as a substrate for peroxidase activity determination by using UV-visible spectrophotometer. Protein content of enzyme solution was determined by Biuret method. The specific activity of peroxidase was 0.6361 U mL-1 and the enzyme was purified 1.99 fold over its crude extract. The optimum pH of peroxidase was 6.0 in phosphate buffer and optimum temperature was 40 ?C. The values of Km and Vmax treated statistically using the linear regression method were compared with various graphical methods (Michaelis-Menten, Lineweaver-Burk, Eadie-Hofstee and Hanes-Wilkinson). The Km and Vmax values of peroxidase were found to be 0.514 x10-2 M and 26.853 M min-1 , respectively, from Lineweaver-Burk plot. The reaction order for peroxidase-catalyzed reaction of conversion of guaiacol to tetraguaiacol was found to be first order. The activation energy (Ea) of peroxidasecatalyzed reaction was calculated to be 3.592 kcal mol-1 . The decolourisation of methyl orange (MO) by crude peroxidase from bitter gourd was studied by using spectrophotometric method.	2021
1545	Khine Yee Htoo	GREEN SYNTHESIS AND CHARACTERIZATION OF TIN(IV) OXIDE NANOPARTICLES AND STUDY ON ITS ANTIMICROBIAL ACTIVITY	The tin oxide nanoparticles (SnO2 NPs) were fabricated via eco-friendly process using lime (Citrus aurantifolia) peels extract as reducing agent. The main phytochemicals present in aqueous peels of lime are ?�amino acid, carbohydrates, organic acids, glycosides, phenolic compound, reducing sugar, saponins, steroids and starch are responsible for bio-reduction of nanoparticles. The crystalline nature and lattice parameter was studied by x-ray diffraction (XRD) which confirmed the formation of tetragonal rutile SnO2 NPs with average crystallite size of 40.8 nm. The functional groups present in prepared SnO2 NPs were identified by using fourier transform infrared (FTIR) spectroscopy. Surface morphology of prepared nanoparticles was studied with the help of scanning electron microscopy (SEM). The percentage composition and purity of the SnO2 NPs was determined by energy dispersive x-ray (EDS). SnO2 NPs was screened against the selected microorganisms and the order of antimicrobial activities given as; Candida albicans > Bacillus subtilis > Escherichia coli.	2021
1546	Saw Win	INFLUENCE OF THERMOPLASTIC WASTES ON THE PROPERTIES OF BETEL NUT SHELL FIBER (ARECA CATECHU L.) PARTICLEBOARDS	This study aimed to prepared particleboards using bio-waste Betel Nut Shell Fiber (BNF) and resinous materials recycled thermoplastics polyethylene (RPE), polypropylene (RPP) and reused polystyrene (RPS) obtained from plastic wastes. The particleboards were prepared by mixing the fibers and plastics followed by hydraulic hot press molding method. The fibers and plastics (1:1) by weight ratio were pressed under 2200 psi with pressing temperature 170 �C for 15 min. The properties of prepared particleboards were measured according to BS -1811, IS-3087 and ASTM D � 412 and ASTM D- 256 standard methods. The results obtained were compared with FAO (2013) and JSA (2003) standard values. The surface morphological characters of prepared particleboards were recorded by Digital Microscope. It was found that the properties of particleboards were in agreement with the standard values. The obtained properties convincingly indicate high bonding ability of the recycled and reused plastics. The reused polystyrene was the most suitable for particleboard production among two recycled and one reused plastics due to the particleboard made with reused polystyrene possess the highest bending strength 232.70 kg/cm2 , the lowest water absorption (9.31%) and swelling thickness (11.47%) even though it had the lowest thickness value of 0.35 cm.	2021
1547	Aung Khaing	SYNTHESIS OF 2D g-C3N4/BiOCl HETEROJUNCTION WITH MIXED SOLVENTS TO ENHANCE VISIBLE-LIGHT PHOTOCATALYTIC PERFORMANCE	Visible-light response and highly effective charge separation are the vital factors to improve the photocatalytic performance of photocatalysts. In this study, two-dimensional (2D) graphitic carbon nitride/bismuth oxychloride (g-C3N4/BiOCl) heterojunctions were synthesized by one-pot ethanolassisted solvothermal process in the presence of ionic liquid 1-butyl-3-methyl imidazolium chloride ([Bmim]Cl). The ionic liquid acts as solvent, and electrically conducting fluids in the synthesis process, contributing to the uniform dispersion of g-C3N4 on the BiOCl surface. The nanostructured heterojunction was formed with g-C3N4 covering the surface of BiOCl nanosheets uniformly. 2D gC3N4/BiOCl heterojunctions showed higher photocatalytic performance for Rhodamine B (RhB) under visible-light irradiation compared with pure g-C3N4 and BiOCl. The mechanism of synthesized sample g-C3N4/BiOCl-4 showed that ?O2- and h+ plays an active role in the degradation process and the separation of photo induced charges transversely the heterostructure boundary reversed electron-hole recombination. This study provides a new insight into the development of high efficient and stable catalyst with tunable catalytic activity.	2021
1548	Khin Mar Cho	PREPARATION OF BIOPLASTICS FROM POTATO STARCH	This research concerns with preparation of bioplastics from starch (Solanum tuberosum L.). The aim of this work is to prepare biodegradable plastics from potato starch and to study the swelling and water uptake properties, physicomehanical properties, antimicrobial activity and biodegradability of the prepared bioplastics. The potato samples were purchased from Maydawee Market in North Okkalapa Township, Yangon Region, Myanmar. Starch was extracted from potato by cold extraction method. The extracted potato starch was characterized by FT IR technique. FT IR spectrum of extracted potato starch was compared with that of commercial starch. Bioplastic films SG-a, SG-b, SG-c, SGV-a, SGV-b and SGV-c were prepared from extracted potato starch using plasticizer as glycerol (4 %, 6 % and 10 %) with and without vinegar. All bioplastic films are clear and flexible. The degree of swelling and water uptake of prepared bioplastic films were determined. The physicomechanical properties (thickness, tensile strength, percent elongation at break and tear strength) of prepared bioplastic films were measured. The morphology of prepared bioplastic films was studied by SEM technique. In addition, the antimicrobial activities of all sample films were tested by agar well diffusion method against six microorganisms. Moreover, the biodegradability of prepared bioplastic films was evaluated by soil burial method. The prepared bioplastic samples were applied for food packaging.	2021
1549	Aung Paing	PREPARATION AND CHARACTERIZATION OF CHITOSANPOLYVINYL ALCOHOL-GRAPHENE OXIDE COMPOSITE MEMBRANE AND THEIR MECHANICAL PROPERTIES	In this study, the composite membrane forming ability of chitosan (CS), polyvinyl alcohol (PVA) and graphene oxide were prepared. The graphene oxide was prepared from graphite powder. The graphite powder (GP) and prepared graphene oxide (GO) samples were characterized by the X-ray diffraction (XRD), Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT IR) and Thermogravimetric- Differential thermal analysis (TG-DTA). The XRD pattern of graphite powder and exhibited a strong peak at 2? of 26.4� corresponding to a basal spacing of d002 0.336 nm and that of graphene oxide at 2? of 9.79� corresponding to a basal spacing of d002 0.901 nm. The composite membranes were prepared by 1.5 % (w/v) chitosan, 4 % (w/v) PVA and modified with variable loadings of graphene oxide (GO) ranging between 0.2 g to 0.5 g wt. percent. The criteria ratio was investigated using mechanical properties such as tensile strength, elongation at break and tear strength. According to the mechanical properties of composite membranes, CSPVA-GO2, results revealed that the incorporation of graphene oxide into the CS-PVA polymer matrix lead to the improvement of tensile strength and percent of elongation of break. FT IR analysis, indicated that the characteristic absorption peak of CS-PVA-GO2 composite membrane confirmed the polymer blended with GO. SEM micrograph of CS-PVA-GO2 composite membrane exhibited homogeneous and smooth texture. TG-DTA analysis showed that CS-PVA-GO2 composite membrane exhibited the major thermal stability reflected in lower loss of weight with increasing temperature that led to the delay of decomposition.	2021
1550	Myint Myint Than	STUDY ON THE ADSORPTION OF SURFACTANT WITH AND WITHOUT ELECTROLYTES ON ACTIVATED SEASHELL SORBENT	In this study, waste seashell was used as biosorbent for the adsorption of surfactant with and without electrolytes from model aqueous solution at pH 6. Surfactant, Sodium Dodecyl Sulphate (SDS) was used as modifier. The Critical Micelle Concentration (CMC) value of SDS decreased with mixing electrolytes (Na2SO4 and Na3PO4). Therefore, upon addition of Na2SO4 and Na3PO4 in SDS, Na3PO4 decreased the CMC value of SDS more than Na2SO4. Adsorption of SDS on Heat Activated Sea Shell Powder (HASSP-7) sample by batch operations were conducted with different operation parameters such as initial concentration of adsorbate and dosage of adsorbent. The optimum dosage was 0.1 g and initial concentration was 100 ppm. Sorption of SDS on HASSP-7 was conducted with and without electrolytes. The adsorbed amount of SDS was found more with electrolytes than without electrolytes. Moreover, the amount of SDS adsorption with Na2SO4 was high in comparison with Na3PO4. The outcome of the present research is the surfactant consumption can be reduced by adding small amount of electrolytes to the surfactant solutions. It is expected that they can be used in the treatment of paper industrial wastewater containing surfactant (SDS).	2021

Research Publications

Myanmar Academy of Art & Science List of Research