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Your search keyword '"Wardana, I. N. G."' showing total 139 results
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139 results on '"Wardana, I. N. G."'

16. IDENTIFYING THE FEATURES OF SURFACE ROUGHNESS AND H2 BUBBLE PRODUCTION ON THE SUPER-HYDROPHOBIC PROPERTIES OF AL2O3 AND MG MEMBRANES.

Author

Subagyo, Rachmat, Wardana, I. N. G., Widodo, Agung Sugeng, Siswanto, Eko, Nugraha, Andy, Fadilah, M. Munawar, Agusnaedi, and Ramadhani, Ahmad Fadhila

Subjects
MEMBRANE filtration in water purification, SURFACE roughness, ALUMINUM oxide, GAS absorption & adsorption, MEMBRANE distillation, SURFACE tension
Abstract

This research investigates Alumina (Al2O3) and Magnesium nano membrane layers using hybrid technology. Hybrid is a concept of combining two or more materials/elements to achieve something better. Hybrid technology was developed because of the possibility of combining materials/elements which, if used simultaneously, has more advantages than if used independently. The problem to be solved is to find the best composition of Alumina and Magnesium hybrid membranes. Superhydrophobic properties of the membrane are achieved at a percentage of Mg:50 %, Al2O3:50 %. At a composition below 50 % Mg, the small surface roughness has a low surface tension, while the H2 production reaction by Mg is also low, so the surface tension carrying capacity of the gas and the roughness of the droplets is not strong, which causes the hydrophobicity to be low. In compositions above 50 % Mg, H2 production by high Mg makes bubbles cover the roughness peaks so that the surface tension is lower and changes the superhydrophobic to hydrophobic properties. At a high Mg percentage, H2 production is very large, while surface roughness decreases due to minimal Al2O3. As a result, the roughness grooves are unable to accommodate H2 gas bubbles, the bubbles completely cover the roughness peaks which are the source of surface tension so that the hydrophobic properties become hydrophilic. The results of this best hybrid composition can be used as a guide in making superhydrophobic membranes on Alumina (Al2O3) and Magnesium alloys. This membrane application is used as a filtration membrane in the water purification process. Superhydrophobic membranes are widely applied in membrane distillation, membrane gas absorption and pervaporation. [ABSTRACT FROM AUTHOR]

Published
2023
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24. Effect of papaya latex bio-activators on the morphological changes of recycled pulp fiber and paper properties: A progress towards green technology.

Author

Anisa, Nurfa, Darmadi, Djarot B., Sugiono, Ngafwan, Waluyo, Budi, and Wardana, I. N. G.

Subjects
PAPER pulp, GREEN technology, PAPAYA, NANOFIBERS, LATEX, LIQUID waste, WATER storage
Abstract

It is essential to use enzymes as a substituting chemical to enhance the properties of pulp and paper. However, there is a limited match between the material and the enzymes applied. Therefore, this research aims to increase pulp and paper properties enzymatically by adding papaya latex bio-activator in the recycled pulp process using the hydrolyzing method. The results showed that this bio-activator made the fiber bulky due to the storage of more water in the pulp, thereby expanding the fiber surface, which facilitated tearing and increasing fibrillation in the refining process. This process led to changes in the surface morphology of fiber and structure of pulp fibers, which were determined from the Scanning Electron Microscopy (SEM) test. It also increased fiber fibrillation, which led to a rise in bond strength between fibers capable of raising paper properties. In conclusion, papaya latex bio-activator reduces the use of chemical hydrogen peroxide (H2O2), increases fibrillation in the refining process and reduces environmental liquid waste pollution. [ABSTRACT FROM AUTHOR]

Published
2023
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