Phyu Win | Technological University(Lashio),Myanmar (original) (raw)

Papers by Phyu Win

The aim of this study is to increase the efficiency of a low cost, low energy and low environment... more The aim of this study is to increase the efficiency of a low cost, low energy and low environmental impact
drinking water purification system by using synthesized silver-titanium dioxide(Ag-TiO2) nanocomposite materials that exhibits strong antibacterial activity. Composite Ag-TiO2 was synthesized by one-pot sol-gel method using silver nitrate (AgNO3) as silver (Ag) source and titanium isopropoxide as titania (TiO2) source. Ag-TiO2 nanocomposites were characterized by x-ray diffraction (XRD), scanning electron microscopy (SEM) and size distribution analysis (Zeta sizer).
Prescreening anti-E.coli bacterial activity of the obtained nanocomposites was tested using agar-well diffusion method and plate count method.AgTiO2 nanocomposite that has strongest antibacterial activity was selected and applied to ceramic water filter pot(CWP) and then compared with the activity of current antibacterial substance colloidal silver. Atomic absorbance spectroscopy (AAS) was used to detect silver ion leakage from this nanocomposite coated pots. Negligible Ag ion leakage was observed in filtered water from nanocomposite coated filter pot. Contaminated water samples were collected from Hlaingriver, Ngamoeyeik creek and Hlaw- gar water distribution pipe-line, and flowed through the nanocomposite coating ceramic water filter pots to be tested for bacteria removal effectiveness. E.coli/coliform petrifilms
were used to determine the bacterial removal efficiency by comparing the concentrations of target organisms before and after treatment. The result showed that higher removal of contaminated E.coli/coliform was obtained by synthesized Ag-TiO2 nanocomposite than colloidal silver. It is seen that TiO2 served as solid support to maintain the dispersion of Agclusters that could contribute to the better antibacterial performance in CWF.

Effect of heat treatment on different properties of Titanium dioxide(TiO2) nanocrystal is being r... more Effect of heat treatment on different properties of Titanium dioxide(TiO2) nanocrystal is being reported. Nanocrystalline TiO2 was synthesized via chemical precipitation methods using TiCl3 as starting material with two types of precipitants: NaOH and NH4OH. The effect of calcination temperatures (300,500 and 900˚C) on the crystalline structure, phase formation and morphology of synthesized TiO2 were investigated by Xray diffraction (XRD) and Scanning electron microscope (SEM). For precipitation method using TiCl3 + NaOH, the structure and phase determination using XRD analysis were confirmed the small crystallite size in the range of 11nm to 31nm with rutile phase. In the case of TiCl3 + NH4OH, phase transformation from anatase to rutile was clearly observed at annealing temperature of 900˚C. The SEM range revealed that almost of the nanocrystals are in spherical shape and effect of heat treatment on particle size was observed. According to the results, pH does not influence the TiO2 morphology but the agglomeration becomes higher when the temperature calcination is increased.

A simple and efficient synthesis of copper II oxide nanoparticles was carried out by precipitatio... more A simple and efficient synthesis of copper II oxide nanoparticles was carried out by precipitation method using copper metal chips as precursor and sodium hydroxide as a stabilizing agent at different calcination temperatures. The products were characterized by powder X-ray diffraction (XRD) and scanning electron microscope (SEM). X-ray diffraction indicated that the products were CuO. SEM showed various nanostructures for various heating temperatures. The heating temperatures were varied at 150°C, 200°C, 300°C and 600°C. The CuO nanostructures with the particle size of about 80 nm were prepared at 150°C for 3 hr. When we increased the temperature to 200°C, 300°C and 600°C for 3 hr, CuO nanostructures with the particle size of about 100 nm, 150 nm and 190 nm were obtained respectively. This aqueous precipitation method gives a large scale production of CuO nanoparticles easily.

A simple and efficient synthesis of copper II oxide nanoparticles was carried out by precipitatio... more A simple and efficient synthesis of copper II oxide nanoparticles was carried out by precipitation method using copper metal chips as precursor and sodium hydroxide as a stabilizing agent at different calcination temperatures. The products were characterized by powder X-ray diffraction (XRD) and scanning electron microscope (SEM). X-ray diffraction indicated that the products were CuO. SEM showed various nanostructures for various heating temperatures. The heating temperatures were varied at 150°C, 200°C, 300°C and 600°C. The CuO nanostructures with the particle size of about 80 nm were prepared at 150°C for 3 hr. When we increased the temperature to 200°C, 300°C and 600°C for 3 hr, CuO nanostructures with the particle size of about 100 nm, 150 nm and 190 nm were obtained respectively. This aqueous precipitation method gives a large scale production of CuO nanoparticles easily.

The spherical zinc oxide nanoparticles were successfully synthesized by alkaline precipitation te... more The spherical zinc oxide nanoparticles were successfully synthesized by alkaline precipitation technique from zinc acetate dihydrate and sodium hydroxide using triethanolamine (TEA) as surface active agent in order to obtain the particles more spherical. The spherical ZnO nanoparticles with the range from 150 nm to 300 nm were observed from this method. For comparison, a simple heating of zinc acetate dehydrate precursor by adding various contents of poly ethylene glycol (PEG) was carried out to prepare the uniform, hexagonal shape and dispersed zinc oxide nanoparticles with narrow size distribution. The morphologies of prepared zinc oxide nanoparticles were determined by scanning electron microscope (SEM). The elemental composition of zinc oxide nanoparticles was carried out by SEM attached Energy Dispersive X-ray Diffractometer (EDX) and the crystallization phase structures were studied by X-ray diffraction (XRD).

Carbohydrate Polymers, 2003

... In this study, partially phosphorylated chitosan was used for the preparation of PCS gel bead... more ... In this study, partially phosphorylated chitosan was used for the preparation of PCS gel beads using TPP to improve the controlled release system in a GI fluid. ... This behavior shows that drug release profiles of PCS gel beads are pH-sensitive. ...

Advances in Natural Sciences: Nanoscience and Nanotechnology, 2012

Clear and uniform one-dimensional (1D) α-MnO 2 nanorods with diameters of 30-50 nm were prepared ... more Clear and uniform one-dimensional (1D) α-MnO 2 nanorods with diameters of 30-50 nm were prepared by hydrothermal treatment of homogeneous solution of hydrated MnSO 4 and KMnO 4 with a little H 2 O 2 . Upon control of hydrothermal conditions (reaction temperature and duration time), an excellent crystalline phase of MnO 2 was obtained and its morphology was investigated. The crystal structures of as-synthesized MnO 2 products have been characterized by x-ray diffraction (XRD). The morphology of the product was examined by scanning electron microscopy (SEM) and the chemical composition was analyzed using energy dispersive spectroscopy (EDS) along with SEM. The Mn concentration was determined by the chemical titration method.

Polymer International, 2005

This study investigated the effect of proteolytic enzymes on in vitro release of ibuprofen from p... more This study investigated the effect of proteolytic enzymes on in vitro release of ibuprofen from phosphorylated chitosan (PCS) microspheres in simulated gastric fluid (SGF) (pH 1.4) and simulated intestinal fluid (SIF) (pH 7.4). To reduce the enzymatic degradability and to enhance the sustained release property, polyelectrolyte complex microspheres based on PCS were developed and characterized. The ibuprofen release from PCS microspheres was found to be sustained more effectively than that from CS microspheres in the medium containing proteolytic enzymes. It was concluded that the PCS microspheres can be used more successfully as sustained oral drug-delivery vehicles than CS microspheres due to their lesser enzymatic degradability. Copyright © 2004 Society of Chemical Industry

The aim of this study is to increase the efficiency of a low cost, low energy and low environment... more The aim of this study is to increase the efficiency of a low cost, low energy and low environmental impact
drinking water purification system by using synthesized silver-titanium dioxide(Ag-TiO2) nanocomposite materials that exhibits strong antibacterial activity. Composite Ag-TiO2 was synthesized by one-pot sol-gel method using silver nitrate (AgNO3) as silver (Ag) source and titanium isopropoxide as titania (TiO2) source. Ag-TiO2 nanocomposites were characterized by x-ray diffraction (XRD), scanning electron microscopy (SEM) and size distribution analysis (Zeta sizer).
Prescreening anti-E.coli bacterial activity of the obtained nanocomposites was tested using agar-well diffusion method and plate count method.AgTiO2 nanocomposite that has strongest antibacterial activity was selected and applied to ceramic water filter pot(CWP) and then compared with the activity of current antibacterial substance colloidal silver. Atomic absorbance spectroscopy (AAS) was used to detect silver ion leakage from this nanocomposite coated pots. Negligible Ag ion leakage was observed in filtered water from nanocomposite coated filter pot. Contaminated water samples were collected from Hlaingriver, Ngamoeyeik creek and Hlaw- gar water distribution pipe-line, and flowed through the nanocomposite coating ceramic water filter pots to be tested for bacteria removal effectiveness. E.coli/coliform petrifilms
were used to determine the bacterial removal efficiency by comparing the concentrations of target organisms before and after treatment. The result showed that higher removal of contaminated E.coli/coliform was obtained by synthesized Ag-TiO2 nanocomposite than colloidal silver. It is seen that TiO2 served as solid support to maintain the dispersion of Agclusters that could contribute to the better antibacterial performance in CWF.

Effect of heat treatment on different properties of Titanium dioxide(TiO2) nanocrystal is being r... more Effect of heat treatment on different properties of Titanium dioxide(TiO2) nanocrystal is being reported. Nanocrystalline TiO2 was synthesized via chemical precipitation methods using TiCl3 as starting material with two types of precipitants: NaOH and NH4OH. The effect of calcination temperatures (300,500 and 900˚C) on the crystalline structure, phase formation and morphology of synthesized TiO2 were investigated by Xray diffraction (XRD) and Scanning electron microscope (SEM). For precipitation method using TiCl3 + NaOH, the structure and phase determination using XRD analysis were confirmed the small crystallite size in the range of 11nm to 31nm with rutile phase. In the case of TiCl3 + NH4OH, phase transformation from anatase to rutile was clearly observed at annealing temperature of 900˚C. The SEM range revealed that almost of the nanocrystals are in spherical shape and effect of heat treatment on particle size was observed. According to the results, pH does not influence the TiO2 morphology but the agglomeration becomes higher when the temperature calcination is increased.

A simple and efficient synthesis of copper II oxide nanoparticles was carried out by precipitatio... more A simple and efficient synthesis of copper II oxide nanoparticles was carried out by precipitation method using copper metal chips as precursor and sodium hydroxide as a stabilizing agent at different calcination temperatures. The products were characterized by powder X-ray diffraction (XRD) and scanning electron microscope (SEM). X-ray diffraction indicated that the products were CuO. SEM showed various nanostructures for various heating temperatures. The heating temperatures were varied at 150°C, 200°C, 300°C and 600°C. The CuO nanostructures with the particle size of about 80 nm were prepared at 150°C for 3 hr. When we increased the temperature to 200°C, 300°C and 600°C for 3 hr, CuO nanostructures with the particle size of about 100 nm, 150 nm and 190 nm were obtained respectively. This aqueous precipitation method gives a large scale production of CuO nanoparticles easily.

A simple and efficient synthesis of copper II oxide nanoparticles was carried out by precipitatio... more A simple and efficient synthesis of copper II oxide nanoparticles was carried out by precipitation method using copper metal chips as precursor and sodium hydroxide as a stabilizing agent at different calcination temperatures. The products were characterized by powder X-ray diffraction (XRD) and scanning electron microscope (SEM). X-ray diffraction indicated that the products were CuO. SEM showed various nanostructures for various heating temperatures. The heating temperatures were varied at 150°C, 200°C, 300°C and 600°C. The CuO nanostructures with the particle size of about 80 nm were prepared at 150°C for 3 hr. When we increased the temperature to 200°C, 300°C and 600°C for 3 hr, CuO nanostructures with the particle size of about 100 nm, 150 nm and 190 nm were obtained respectively. This aqueous precipitation method gives a large scale production of CuO nanoparticles easily.

The spherical zinc oxide nanoparticles were successfully synthesized by alkaline precipitation te... more The spherical zinc oxide nanoparticles were successfully synthesized by alkaline precipitation technique from zinc acetate dihydrate and sodium hydroxide using triethanolamine (TEA) as surface active agent in order to obtain the particles more spherical. The spherical ZnO nanoparticles with the range from 150 nm to 300 nm were observed from this method. For comparison, a simple heating of zinc acetate dehydrate precursor by adding various contents of poly ethylene glycol (PEG) was carried out to prepare the uniform, hexagonal shape and dispersed zinc oxide nanoparticles with narrow size distribution. The morphologies of prepared zinc oxide nanoparticles were determined by scanning electron microscope (SEM). The elemental composition of zinc oxide nanoparticles was carried out by SEM attached Energy Dispersive X-ray Diffractometer (EDX) and the crystallization phase structures were studied by X-ray diffraction (XRD).

Carbohydrate Polymers, 2003

... In this study, partially phosphorylated chitosan was used for the preparation of PCS gel bead... more ... In this study, partially phosphorylated chitosan was used for the preparation of PCS gel beads using TPP to improve the controlled release system in a GI fluid. ... This behavior shows that drug release profiles of PCS gel beads are pH-sensitive. ...

Advances in Natural Sciences: Nanoscience and Nanotechnology, 2012

Clear and uniform one-dimensional (1D) α-MnO 2 nanorods with diameters of 30-50 nm were prepared ... more Clear and uniform one-dimensional (1D) α-MnO 2 nanorods with diameters of 30-50 nm were prepared by hydrothermal treatment of homogeneous solution of hydrated MnSO 4 and KMnO 4 with a little H 2 O 2 . Upon control of hydrothermal conditions (reaction temperature and duration time), an excellent crystalline phase of MnO 2 was obtained and its morphology was investigated. The crystal structures of as-synthesized MnO 2 products have been characterized by x-ray diffraction (XRD). The morphology of the product was examined by scanning electron microscopy (SEM) and the chemical composition was analyzed using energy dispersive spectroscopy (EDS) along with SEM. The Mn concentration was determined by the chemical titration method.

Polymer International, 2005

This study investigated the effect of proteolytic enzymes on in vitro release of ibuprofen from p... more This study investigated the effect of proteolytic enzymes on in vitro release of ibuprofen from phosphorylated chitosan (PCS) microspheres in simulated gastric fluid (SGF) (pH 1.4) and simulated intestinal fluid (SIF) (pH 7.4). To reduce the enzymatic degradability and to enhance the sustained release property, polyelectrolyte complex microspheres based on PCS were developed and characterized. The ibuprofen release from PCS microspheres was found to be sustained more effectively than that from CS microspheres in the medium containing proteolytic enzymes. It was concluded that the PCS microspheres can be used more successfully as sustained oral drug-delivery vehicles than CS microspheres due to their lesser enzymatic degradability. Copyright © 2004 Society of Chemical Industry