Ratna Surya Alwi

ORCID: 0000-0002-2930-8223
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About
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Research Areas
  • Phase Equilibria and Thermodynamics
  • Chemical Thermodynamics and Molecular Structure
  • Analytical Chemistry and Chromatography
  • Adsorption, diffusion, and thermodynamic properties of materials
  • Crystallization and Solubility Studies
  • Adsorption and biosorption for pollutant removal
  • Ionic liquids properties and applications
  • Thermochemical Biomass Conversion Processes
  • Essential Oils and Antimicrobial Activity
  • Computational Drug Discovery Methods
  • Subcritical and Supercritical Water Processes
  • Plant biochemistry and biosynthesis
  • Nanomaterials for catalytic reactions
  • Combustion and flame dynamics
  • Magnesium Oxide Properties and Applications
  • Nanoparticles: synthesis and applications
  • Recycling and Waste Management Techniques
  • Nanoparticle-Based Drug Delivery
  • Catalysis for Biomass Conversion
  • Nuclear and radioactivity studies
  • Plant-Derived Bioactive Compounds
  • Lignin and Wood Chemistry
  • Recycling and utilization of industrial and municipal waste in materials production
  • TiO2 Photocatalysis and Solar Cells
  • Biodiesel Production and Applications

Indonesian Institute of Sciences
2025

National Research and Innovation Agency
2022-2024

National Nuclear Energy Agency of Indonesia
2022-2023

Tenaga Nasional Berhad (Malaysia)
2023

Universitas Fajar
2017-2022

Kanazawa University
2014-2017

University of Technology Malaysia
2011

A static method is employed to determine the solubilities of verapamil in supercritical carbon dioxide (SC-CO2) at temperatures between 308 and 338 K pressures 12 30 MPa. The solubility SC-CO2 expressed as mole fraction are range 3.6 × 10-6 7.14 10-5. Using four semi-empirical density-based models, data correlated: Chrastil, Bartle, Kumar-Johnston (K-J), Mendez-Santiago Teja (MST), two equations state (SRK PC-SAFT EoS), expanded liquid models (modified Wilson's models), regular solution...

10.1038/s41598-023-44280-7 article EN cc-by Scientific Reports 2023-10-10

In order to provide the facilities design supercritical fluid (SCF) processes for micro or nanosizing of solid solute compounds such as drugs, it is essential obtain their solubility in green solvents like pressurized CO2. This important role first stage assessing each SCF technology. A statistical method was developed time and employed determine 5-fluorouracil (5-Fu) solubility. The measurements were performed at different pressures (120-270 bar) temperatures (308-338 K) through UV-vis...

10.1038/s41598-025-87383-z article EN cc-by-nc-nd Scientific Reports 2025-02-07

Solubility of several anthraquinone derivatives in supercritical carbon dioxide was readily available the literature, but correcting ability existing models poor. Therefore, this work, two new have been developed for better correlation based on solid–liquid phase equilibria. The model has five adjustable parameters correlating solubility isotherms as a function temperature. accuracy proposed evaluated by 25 binary systems. observed provide best overall correlations. deviation between...

10.3390/molecules26020460 article EN cc-by Molecules 2021-01-17

Solubilites of 1,4-diamino-2,3-dichloroanthraquinone (C.I. Disperse Violet 28) and 1,8-dihydroxy-4,5-dinitroanthraquinone in supercritical carbon dioxide (sc-CO2) were measured at the temperature (323.15, 353.15 383.15) K over pressure ranges (12.5 to 25.0) MPa by a flow-type apparatus. Mole fraction solubility is found significantly higher than that 1,8-dihydroxy-4,5-dinitroanthraquinone. It was 2,3-dichloro group addition onto 1,4-diaminoanthraquione leads 1,4-diaminoanthraquinone...

10.1021/acs.jced.5b00480 article EN Journal of Chemical & Engineering Data 2015-09-18

This review paper explores the utilization of supercritical carbon dioxide (SC-CO2) extraction to isolate citronella oil, delving into its multifaceted dimensions, including process optimization, product quality enhancement, and diverse potential applications. Citronella renowned for myriad bioactive compounds with demonstrated health benefits, is a coveted essential oil in pharmaceutical, cosmetics, food industries. The transition from traditional techniques SC-CO2 presents paradigm shift...

10.47836/pjst.32.3.04 article EN cc-by-nc-nd Pertanika journal of science & technology 2024-03-29

The residues from the wood industry are main contributors to biomass waste in Indonesia. conventional pyrolysis process, which needs a large energy as well produce various toxic chemical environment. Therefore, unit on laboratory scale was designed that can be good alternative achieve zero-waste and low cost. In this paper attempts discuss design system of reactor bio-oil bio-char simultaneously.

10.1063/1.4982340 article EN AIP conference proceedings 2017-01-01

Valorizing natural resources through sustainable and eco-friendly processes is a cornerstone in pursuing greener more future. This study focuses on the green extraction of valuable compounds from rubber seed trees (Hevea brasiliensis). underutilized resource has potential to yield bioactive economic ecological significance. We explore application environmentally friendly techniques, including supercritical fluid (SFE), microwave-assisted (MAE) ultrasound-assisted (UAE), harness seeds. Our...

10.3390/app132413102 article EN cc-by Applied Sciences 2023-12-08
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