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Articles by T.S.Y. Choong
Total Records ( 2 ) for T.S.Y. Choong
  G.H. Chong , R. Yunus , N. Abdullah , T.S.Y. Choong and S. Spotar
  Problem statement: Literature on the production of nanoparticles using supercritical fluids is substantial, but comparatively much less for nanoencapsulation.
Approach:In this study, a modified Supercritical Anti Solvent (SAS) apparatus was fabricated for use in the production of nanoparticles using carbon dioxide as the supercritical fluid (SCF). SAS technique involves precipitation of solids from liquid solution under supercritical antisolvent-induced condition. Production of nanoparticles using SAS was investigated using 2 types of model solutes: Fume silica and acetaminophen which represent a model of water insoluble (inorganic) material and water soluble material respectively. The morphology and characteristics of nanoparticles produced were assessed.
Results:The fume silica had been coated and 50 nm diameter of nanoencapsulated acetaminophen had been produced.
The results had revealed that both water insoluble and soluble substrates can be coated and encapsulated successfully in polymer by the SAS coating process.
  Y.L. Lai , T.S.Y. Choong , T.G. Chuah , I.S. Ahamad and L.F. Razon
  Cyclic process is inherently dynamic, thus it has no steady state. However, the process, after a sufficient number of cycles, will reach a state called Cyclic Steady State (CSS) where the process state variables at some instant within a cycle have the same value at the corresponding instant within each subsequent cycle. Depending on the nature of the cyclic process, the number of cycles needed before the process reaches CSS may vary from tens to thousands. In this study, a hybrid algorithm that aims to predict and accelerate the convergence of the CSS is developed and tested on a cyclic operation of controlled-cycled stirred tank reactor.
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