Research List

No.	Researcher	Title	Abstract	Year
1061	Kay Thi Tun	STRUCTURAL CHARACTERISTIC, OPTICAL PROPERTIES AND AC ELECTRICAL CONDUCTIVITIES OF PEROVSKITE LaCoO3 PREPARED BY DIFFERENT METHODS	Perovskite LaCoO3 material was prepared by two different methods; citrate sol-gel and co-precipitation methods. The simple low temperature synthesis has been presented of single phased LaCoO3 for cathode application in solid oxide fuel cell (SOFC). The X-ray diffraction (XRD) shows that the hexagonal LaCoO3 phase was well formed at sintering temperature 900 �C in the citrate sol-gel and co-precipitation methods. Scanning electron microscopy (SEM) analysis indicates that the particle size of LaCoO3 powder varies from 20 nm to 60 nm depending on the preparation method. The FT IR spectra confirm that the absorption band of La-O and Co-O bonding appeared at 665, 592 and 406 cm-1 . The optical properties of LaCoO3 studied by UVvisible spectrophotometer in the wavelength range of 300 nm to 700 nm. The band gap values of the LaCoO3 prepared by citrate sol-gel method and by co-precipitation are 2.15 eV and 2.42 eV respectively. The dielectric properties and ac electrical conductivity have been investigated by LCR meter in the frequency range of 100- 1000 kHz. The ac electrical conductivity value of LaCoO3 prepared by citrate sol-gel method is 8.74 ??cm-1 and by co-precipitation method is 4.38 ??cm-1 respectively. The perovskite LaCoO3 prepared by citrate sol-gel method show highly dense structure, lower band gap value and high electrical conductivity than the LaCoO3 obtained by co-precipitation method.	2020
1062	Ma Ohn Kyi	GREEN SYNTHESIS OF GOLD NANOPARTICLES AND CHITOSAN-GOLD NANOPARTICLES COMPOSITE BEADS AND THEIR APPLICATION	This research work concerns with the green synthesis and characterization of gold nanoparticles (GNP) and chitosan-gold nanoparticles (CS-GNP) composite beads. The gold nanoparticles (GNP) were prepared from chloroauric acid in the presence of the aqueous extract from fresh papaya leaf as well as dry papaya leaf used as reducing agents, respectively. The existence of prepared GNP in colloidal solutions was determined by using laser pointer, noted as GNP (G) and GNP (D), Tyndall effect and the synthesized gold nanoparticles (GNP) solutions were also characterized by UV-visible spectroscopy, TEM, SEM, EDXRF and XRD analyses. On the other hand, chitosan beads were produced from different concentrations of chitosan (1 % to 5 % w/v) in 1 % v/v acetic acid solution and in 2 % w/v sodium hydroxide solution. The chitosan-gold nanoparticles composites were then prepared from gold nanoparticles and 3 % w/v chitosan solutions. These composites solutions were forced through by syringe into 2 % w/v sodium hydroxide to form beads, were designed as CS-GNP (G) and CS-GNP (D).The physical properties of prepared chitosan beads and chitosan-gold nanoparticles composite beads were studied, such as water content, moisture content, pH and swelling percent in different pH of buffer solutions at different contact times, and these samples were also characterized by using FT IR, EDXRF, SEM and XRD analyses. Then these prepared composite beads were applied in drug delivery system. Aspirin (ASA) was used as a model drug. The absorption of aspirin by the composite beads was determined by using UV-visible spectrophotometer. The physical properties of drug loaded chitosan-gold nanoparticles composite beads such as ASA-CS-GNP (G) and ASA-CS-GNP (D) were studied and these drug loaded samples have been characterized by FT IR, EDXRF, SEM and XRD analyses. Then drug release behaviors of such drug loaded composite beads were investigated in simulated gastrointestinal fluid pH of buffer solutions and acute toxicity of the prepared chitosan-gold nanoparticles colloidal solutions was examined.	2020
1063	Ohn Mar Khin	PHOSPHATE ION REMOVAL FROM MODEL SOLUTION USING ACID TREATED COAL FLY ASH	This research was aimed to examine the adsorption behaviour of phosphate ion on modified coal fly ash under different operating conditions to determine the optimum condition to remove phosphate ion. The coal fly ash was treated with hydrochloric acid and optimal conditions were found to be 2 M HCl solution, the ratio of coal fly ash and acid solution is 1:2 (w/v) and for 2 h of acid treated time at ambient temperature. Batch adsorption experiments were performed to evaluate phosphate removal efficiency of acid treated coal fly ash. The effect of various adsorption parameters, i.e. pH, adsorption time, adsorbent dose and initial phosphate ion concentration using the acid treated coal fly ash was studied. The maximum removal percent of phosphate ion was achieved 94.03 % at an adsorbent acid treated coal fly ash loading weight of 0.1 g/100 mL, 1 mg L -1 of initial concentration of phosphate solution, pH of 3 and 90 min of contact time at ambient temperature. Coal fly ash (CFA), acid treated coal fly ash (ACFA) and phosphate ion sorpted acid treated coal fly ash (PACFA) were characterized by using modern techniques such as SEM, EDXRF and XRD. According to widen applicability of the proposed method, it can be used for the removal of phosphate from eutrophicated surface water.	2020
1064	Mi Mi Lay	REMOVAL OF ARSENIC AND LEAD TOXIC METALS BY KYAUK PATAUNG KAOLIN AND CHARACTERIZATION OF ARSENIC AND LEAD LOADED KAOLIN	This research work is focused on the determination of optimum conditions for the removal of arsenic and lead toxic elements in model solutions by using Kyauk Pataung (KPT) kaolin sample. In this research, removal of arsenic and lead ions from the model solutions using KPT kaolin was studied by the effect of contact time (0.5-24 h), effect of dosage (0.5- 3.5 g), effect of pH (4-9), metal concentration (50-800 ppm) at room temperature. The KPT kaolin sample was observed to remove 97.29 % of arsenic (100 ppm of initial concentration) using 2 g of KPT kaolin after 12 h contact time at pH 7, whereas 95.08 % of lead could be removed under the above conditions at pH 5. The amount of arsenic and lead remained in the solutions after treating with KPT kaolin were determined by using AAS technique. The arsenic and lead loaded kaolin sample were characterized by EDXRF, SEM and FT IR analyses.	2020
1065	Tin Moe Swe	SYNTHESIS OF GOLD-SILVER BIMETALLIC NANOPARTICLES (AU-AG NPs) AND STUDY ON ITS APPLICATION	In this study, gold-silver bimetallic nanoparticles (Au-Ag NPs) were synthesized by reduction of different volumes of silver nitrate (AgNO3) and chloroauric acid (HAuCl4) using 1 % w/v chitosan solution as reducing agent. The existence of nanoparticles in colloidal solution was confirmed by Tyndall effect. From the UV-vis spectra, the maximum absorptions of Au-Ag NPs were observed at the wavelengths of 479-562 nm which confirms the characteristic of nanoparticles. The antimicrobial activities of nanoparticles against the organisms were evaluated by agar well diffusion method. Based on the results of UV-vis spectroscopy and antimicrobial activities, sample (Au-Ag NPs 2) was chosen and characterized by XRD, FT IR and EDXRF analyses. XRD spectral data indicated that the selected sample was crystalline nature with nanosizes. The corresponding functional groups and the relative abundance of elements in nanoparticles were observed from FT IR and EDXRF analyses. The application of selected sample was also studied in biomedical field especially burn wound healing compared with standard sofratu drug. It was found that bimetallic nanoparticles (Au-Ag NPs 2) was better than sofratu for healing of burn wound with well-developed sebaceous glands, sweat glands and hair follicles in epidermis layer of skin. This research therefore contributes to academics as well as biomedical application.	2020
1066	Kyi Win Mon	PREPARATION AND CHARACTERIZATION OF JUTE FIBER REINFORCED COMPOSITE	This research work is mainly concerned with the preparation of composite from 5 % NaOH modified waste jute fiber with epoxy resin as binder and the study of their characteristics. Jute fiber (JF) and epoxy resin (E) were collected from Yangon Region and this research was done at Polymer Research Department, Department of Research & Innovation (DRI), Yangon. Composites were prepared by mixing 5 % NaOH modified waste jute fiber (120 g) with various amounts (5 %, 10 %, 15 %, 20 %, 25 % and 30 %) of epoxy resin (E) using cold compressing method at 2300 psi. The prepared composites were characterized by physicochemical and physicomechanical parameters such as modulus of rupture (MOR), thickness, density, water absorption, swelling thickness as well as hardness. From the results obtained, it was found that 5 % NaOH modified waste jute fiber (120 g) with 20 % epoxy resin (E), namely (JFE 4) composite was the best quality grade composite. It possesses 1248.20 psi modulus of rupture, 0.60 cm thickness, 1.2320 g cm-3 density, 14.18 % water absorption, 23.35 % swelling thickness, and 68 D hardness. JFE 4 composite based on physicomechanical properties, the composite showed to possess the highest modulus of rupture value indicating that this composite was the most significant and the best among all the composites. The FT IR study confirmed the presence of cellulose, hemicellulose and lignin. In addition, Simultaneous Thermal Analyzer (STA) confirmed that the sample was thermally stable till 200 ?C on account of the high complex structure of lignin. The melting point of composite was round about 400 ?C studied by Simultaneous Thermal Analyzer. The surface roughness value of JFE 4 composite was 900 nm studied by Atomic Force Microscopy. The present research on making composite from waste materials can contribute to the solution of the earth�s escalating environmental problems.	2020
1067	Yi Yi Myint	REMOVAL OF COLOURING MATERIALS AND IMPURITIES IN PALM OIL BY USING BENTONITE CLAY	Bleaching or purification is an important step in the refining of fats and vegetable / animal oils for industrial applications. Bleaching clay primarily removes colouring pigments such as chlorophylls and carotenes but peroxide and other impurities (e.g., soaps, trace metals and phosphatides) are also important target of the bleaching process. In the research, palm oil sample was collected to carry out the adsorption of colouring materials and impurities by using raw bentonite, 4 M and 8 M HCl activated bentonite and foreign bleaching clay. In this study, raw bentonite clay was treated with 4 M HCl and 8 M HCl solutions to get better adsorption properties. Characterizations of raw bentonite clay, 4 M HCl and 8 M HCl activated bentonite clay samples were carried out by using FT IR, XRD and chemical analyses. Before bleaching processes, some properties (moisture and impurities, iodine value, peroxide value, free fatty acid content, saponification value, unsaponifiable matters, refractive index and specific gravity) were determined by AOAC and AOCS methods. After treatment with raw and acid activated bentonite clay sample, iodine value and saponification value of palm oil increased, while free fatty acids content, peroxide values, unsaponifiable matters, moisture and impurities of palm oil sample decreased. In this research, bleaching efficiencies of the bentonite clay on plam oil were determined spectrophotometrically. In this research, bleaching efficiency of the raw bentonite clay, 4 M HCl activated and 8 M HCl activated bentonite clay samples were determined at 65, 80 and 90 �C for different contact times. The bleaching efficiencies of raw bentonite clay samples, 4 M HCl activated bentonite clay, 8 M HCl activated bentonite clay samples and foreign bleaching clay were 14.3, 42.8, 49.9 and 26.6 %, respectively, for 100 min contact time. Therefore, 8 M HCl activated bentonite clay sample give the highest bleaching efficiencies. This may concern with the structure of 8 M HCl activated bentonite clay sample. According to XRD data, 8 M HCl activated bentonite clay sample showed the amorphous nature due to the clay structure collapsing, whereas raw and 4 M HCl activated bentonite clay samples were crystalline nature. The amorphous nature of the 8 M HCl activated bentonite clay sample has more sorption ability to carotene in oil sample.	2020
1068	Kalya Cho	ISOLATION AND IDENTIFICATION OF CATECHIN FROM DIOSCOREA BULBIFERA L. TUBERS AND SCREENING ON HYPOGLYCEMIC ACTIVITY	The key process in the development of highly effective and safe herbal medicine is isolation and identification of pharmacologically active compounds from medicinal plants and evaluation of their biological activities. In the present work, catechin, a flavanol was isolated from the ethyl acetate soluble portion of the 70 % ethanol extract from D. bulbifera tubers. The isolated catechin was characterized by using UV, FT IR, 1H NMR, 13C NMR, HSQC, COSY and HMBC spectroscopic methods. The hypoglycemic effects of pet ether, ethyl acetate and water soluble portions of the hydroalcoholic extract and isolated catechin were evaluated on alloxan induced diabetic mice. The percent reduction of blood glucose level (% R) was significant after 4 h administration of tested sample. % R of pet ether, ethyl acetate and water soluble portions, isolated catechin and antidiabetic drug, metformin were found to be 28.83 %, 41.29 %, 31.52 %, 41.62 % and 41.87 %, respectively. % R of ethyl acetate portion and isolated catechin were nearly the same as % R of metformin. The histological examination of pancreatic islet on tested mice was performed by staining with Haematoxylin and Eosin and it was found that ethyl acetate and water soluble portions as well as isolated catechin enhanced the regeneration of the alloxan damaged islet cells.	2020
1069	Ei Ei Hpoo	PREPARATION AND CHARACTERIZATION OF Cu DOPED ZnO POWDER AND ITS ELECTRICAL AND OPTICAL PROPERTIES	The main aim of the research work is to study the preparation and characterization of Cu doped ZnO powder and its electrical and optical properties. Cu doped ZnO nanocrystalline powder was prepared by using a sol-gel method. Cu doped ZnO powder (Zn (1-x) Cu x O) was prepared by using different dopant concentration of Cu (x = 0.03, 0.05). Zn (1-x) Cu x O (x = 0.03, 0.05) was synthesized via the sol-gel technique using new organic precursors pectin and sucrose. The prepared Cu doped ZnO powder was characterized by TG - DTA , XRD, FT IR and SEM analyses.TG-DTA analysis of the synthesized Cu doped ZnO powder was carried out to determine the appropriate calcination temperature. From XRD analysis, it was observed that the crystallite size of the prepared Zn (1-x) Cu x O (x= 0.03, 0.05) are 74 and 72 nm. FT IR spectra of Cu doped ZnO powder, the prominent peak of OH stretching, C-H stretching, O-C-O sym stretching and M-O stretching vibrations was observed. Morphological studies were conducted using SEM to comfirm the grain size and texture. The ac conductivities and dielectric properties of the prepared Cu doped ZnO samples was investigated in the frequency range 10 kHz � 100 kHz by LCR meter. The experimental results indicated that the ac conductivity ( ?ac ) , dielectric loss factor (tan ?) and dielectric constant (?) depend on the frequency. It was observed that ac conductivity is inversely proportional to the dielectric loss factor and dielectric constant. UV-Visible spectrum showed absorbance peaks in the 200-800 nm region. It was found that the absorbance does not significantly change with doping. From UV-Visible spectral data, it was found that the band gap values of Zn (1-x) Cu x O (x = 0.03, 0.05) are 3.2 and 3.0 eV.	2020
1070	Nwe Nwe Win	OPTIMAL CONDITION FOR THE REMOVAL OF METHYLENE BLUE BY USING GRAPHENE OXIDE (LGO, CGO) AND THEIR PROPERTIES	Environmental pollution as a result of rapid development of technologies is one of the serious global concerns. Dyes are usually used in textile manufacturing and are one of the major contaminations in water. Thus, from an environmental point of view, the removal of dyes is of great concern, and recent applications using graphene oxides showed high adsorption ability. Graphene oxide (GO) is a highly effective absorbent of methylene blue (MB) and can be used to remove from aqueous solution. Two different graphene oxides (LGO and CGO) were synthesized from two different graphite sources by using modified Hummer method. Local graphite sample (LGP) was collected from Lin-yaung-chi mine and commercial graphite powder (CGP) was purchased from local chemical shop. The crystalline structures of different graphite varieties and prepared graphene oxides were also characterized by XRD. The optical properties of each graphite and prepared graphene oxides were characterized by UV-Vis spectrometer. The analysis of FT IR spectra was performed to investigate functional groups of graphite and the prepared GO. The surface morphologies of each graphite and prepared graphene oxides were characterized by scanning electron microscope (SEM). Graphene oxide is a material containing functional groups such as carboxyl, carbonyl, epoxy and hydroxyl, that can adsorb cationic dyes. Factors such as initial concentration of dye (MB), the dosage, temperature, contact time, rpm and pH were evaluated. The adsorption capacities of methylene blue on CGO and LGO were nearly 99% under the optimal conditions (dosage = 0.1 g, MB concentration 30 ppm, contact time = 60 min, temperature 35 �C, rpm = 150 and pH=8). Results show that the adsorption equilibrium, the removal efficiencies were higher than 99 % and the solution can be decolorized to nearly colourless. Results show that GO is an effective adsorbent being used to treat effluents contaminated with dyes.	2020

Research Publications

Myanmar Academy of Art & Science List of Research