Hasniah Aliah

Effect of synthesis temperature on the morphology and electrical properties of solution-grown copper nanowires (CuNWs)

Copper nanowires (CuNWs) for different synthesis temperatures were prepared by solution-grown method. The surface morphology and electrical resistance of CuNWs were investigated. The surface morphology analysis describes the synthesis of long (> 20 µm), thin (< 60 nm), and mono-dispersed CuNWs. Thus, in the case of temperature treatment from 4 °C to 80 °C in water based solution, the CuNWs has diameter of about 71 nm, length up to 37 µm and electrical resistance (R) at 0.1 Ω. This study suggests that the as-prepared copper nanowires (CuNWs) with diameter and electrical resistance tunability might be utilized as flexible transparent conducting electrode.

NONLINEAR OSCILLATION MODEL FOR EXPLAINING THE DISTRIBUTION OF POSITION DEVIATION IN SELF-ORGANIZED NANOPARTICLES

A model for explaining deviations of positions in self-organized nanoparticles on a substrate from their corresponding positions in perfect organization is proposed. The model predictions were compared with SEM/TEM images and reported by some authors. We found a consistence between the model predictions with the data of Ag, Fe3O4 and SiO2 nanoparticles organization on various substrates.

Optimization of Coating Temperature of TiO2 Nanoparticles on the Polypropylene Copolymer Surface for Photodegradation of Methylene Blue

TiO2 nanoparticles have been coated on the polypropylene (PP) copolymers using a milling method with temperature controller modification. These experiments were carried out at different milling temperature: 100 °C, 110 °C, 120 °C and 130 °C for 90 minute milling time for each experiment. Photocatalytic degradation of methylene blue (MB) was investigated using TiO2 coated PP copolymer which floats on the MB solution and illuminated under sunlight for 36 hours. It was found that TiO2 coated PP polymer at temperature of 100 °C resulted in optimum decomposition of MB solution. The concentration of MB in a test solution after 18 hours of exposure to the sun was 15.42%. The reaction rate constants (k) and the half‐reaction (t1/2) in the MB photodegradation using the catalysts with a coating temperature of 100 °C, are 0.106 hours−1 and 6.53 hours, respectively. This coated material is very potential for repeated use to purify bulk water in high sunlight intensity region.

Effect of Silica Nanoparticles on Compressive Strength of Leaves-Waste Composite

The utilization of solid‐waste, especially leaves‐waste is one of interesting research of environmental field. One of them is making a composite using polyvinyl acetate (PVAc) polymer as binder (matrix) and silica nanoparticles as reinforcement (filler) to improve the strength of composite‐produced. Those raw materials preliminary were mixed by simple mixing with varied compositions and then hot‐pressed at 36 MPa and 100 °C for 20 minutes. From compressive strength test, it was found that composite with composition 7:8 of PVAc and leaves‐waste had maximum compressive strength, i.e. 57.60 MPa. It was also that the enhancement of strength due to PVAc fraction (w/w) increasing is a percolation behavior, even though its mathematical explanation has not been performed. Into composition of maximum strength above, silica with average size is 74 nm then was added to improve the strength and found that at silica weight fraction of 0.79 (%w/w), the composite had optimum compressive strength, i.e. 70.5 MPa, or incre...

A Novel Method for Synthesis of TiO2 Nanoparticles‐coated Plastic Fibers Using a Vibration Method and the Use of Coated Fibers as Photocatalitic Materials for Decomposing of Organic Pollutant in Water under Sunlight Illumination

Photocatalytic is a catalyst process that requires light energy in process of converting material in a chemical reaction. TiO2 is one of the most suitable materials in photocatalytic process. In this study, TiO2 nanoparticles‐coated plastic fibers made by using vibrating method. TiO2 nanoparticles‐coated plastic fibers products used for wastewater purification using photocatalytic process. Speed of water purification is influenced by TiO2 nanoparticles‐coated plastic fibers position on container. TiO2 nanoparticles‐coated plastic fibers with horizontal position on container has a faster photocatalytic process compared to TiO2 nanoparticles‐coated plastic fibers with vertical position on container.