Philip K. Chan

Philip K. Chan
Ryerson University · Department of Chemical Engineering

About

27
Publications
3,397
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614
Citations
Citations since 2017
0 Research Items
255 Citations
201720182019202020212022202301020304050
201720182019202020212022202301020304050
201720182019202020212022202301020304050
201720182019202020212022202301020304050

Publications

Publications (27)
Article
The nonlinear Cahn-Hilliard theory and the Flory-Huggins-de-Gennes theory were used to study numerically the surface-directed phase separation phenomena of a model binary polymer blend quenched into the unstable region of its binary symmetric upper critical solution temperature phase diagram. Short-range surface potential within a square geometry,...
Article
The merits of the sonophotolysis as a combination of sonolysis (US) and photolysis (UV/H2O2) are investigated in a pilot-scale external loop airlift sonophotoreactor for the treatment of a synthetic pharmaceutical wastewater (SPWW). In the first part of this study, the multivariate experimental design is carried out using BoxeBehnken design (BBD)....
Article
The treatment of a synthetic pharmaceutical wastewater was studied using granular activated carbon (GAC) adsorption, UV/H2O2 process, and their combination. Experimental results reveal that GAC adsorption alone has 79% efficiency in total organic carbon (TOC) removal in 10 min breakthrough time with the dosage of 333.33 mg activated carbon/L. The a...
Article
A mechanistic kinetic model for the photo-Fenton-like degradation of polyacrylic acid (PAA) is developed and validated using experimental data collected by a batch recirculation photoreactor. The developed mathematical model incorporates all detailed photochemical reactions including Fe2+ and Fe3+ chlorocomplexes, inorganic anion radicals (Cl-2(cen...
Article
Full-text available
The kinetic models of the photo-oxidative degradation of water-soluble polymers, as the main component of water-soluble composite films in aqueous solutions, by ultraviolet radiation and hydrogen peroxide (UV/H2O2) are developed. The rate expressions of the photochemical degradation of soluble polymers are developed based on the mass balance of the...
Article
The advanced oxidation of aqueous polyethylene oxide (PEO) is studied using the UV/H2O2 process in a batch recirculation photoreactor. The response surface methodology (RSM), combined with quadratic programming, is used for the experimental design, statistical analysis, and optimization of the process. In the second part, a detailed mathematical mo...
Article
The effect of nematic droplet shape, elastic constant ratio of liquid crystals, and external field strength on the performance of PDLC films is examined. The finite-difference method is used to model a single droplet with external field applied parallel to the droplet axis of symmetry. Genetic algorithm is employed to determine the optimal (i) aspe...
Article
Temperature and initial concentration gradients have been used independently during thermal-induced phase separation to create anisotropic functional porous polymeric materials.In this paper, we developed and implemented a mathematical model that combines both linear temperature and initial linear concentration gradients during the thermal-induced...
Article
The Ludwig-Soret effect was investigated in the thermally induced phase separation process via SD in polymer solutions under an externally imposed spatial linear temperature gradient using mathematical modeling and computer simulation. The mathematical model incorporated non-linear Cahn-Hilliard theory for SD, Flory-Huggins theory for thermodynamic...
Article
Anisotropic porous polymeric materials fabricated from the phase separation method via spinodal decomposition are used in various practical engineering applications. We studied the formation of anisotropic porous polymeric materials numerically, by imposing an initial linear concentration gradient across a model polymer solution. The initial concen...
Article
This paper studied through modeling and computer simulation the two-step thermal-induced phase separation phenomenon in a symmetric polymer blend via spinodal decomposition. The two-step phase separation phenomenon involves the two-step process where the initial quench is allowed to phase separate for a certain period of time before the second quen...
Article
This paper studied the thermal relaxation phenomena after melt-extrusion of a rigid discotic uniaxial nematic mesophase pitch using mathematical modeling and computer simulation. The Ericksen and Landau–de Gennes continuum theories were used to investigate the structure development and texture formation across mesophase pitch based carbon fibers. I...
Article
This paper studies the thermal relaxation phenomena after melt‐extrusion of a rigid discotic uniaxial nematic mesophase pitch using mathematical modelling and computer simulation. The Ericksen and Landau–de Gennes continuum theories are used to investigate the structure development and texture formation across mesophase pitch‐based carbon fibres. T...
Article
This paper studied the thermal-induced phase separation (TIPS) phenomenon via spinodal decomposition (SD) in a polymer solution under a linear concentration gradient. The one-dimensional model consists of the Cahn–Hilliard theory for SD and incorporates the Flory–Huggins free energy equation, the slow mode mobility theory and Rouse model for polyme...
Article
The effects that the elongated nematic bipolar droplet orientation has on the performance of polymer-dispersed liquid crystal (PDLC) films are elucidated in this paper using modeling and simulation. Important performance criteria are low switching field strength in the on-state, good light contrast between the on- and off-states, and fast relaxatio...
Article
Numerical results from the modelling and computer simulation of the magnetic-induced director reorientation dynamics in elongated bipolar nematic droplets are presented in this paper. The magnetic field is applied normally to the droplet axis-of-symmetry direction, which is one possible scenario found in applications of polymer dispersed liquid cry...
Article
The thermal-induced phase separation method is used to fabricate polymer membranes and polymer-dispersed liquid crystal films from polymer solutions. The resultant morphology consists of solvent droplets dispersed uniformly in a solid polymer matrix. Up till now, the modeling and computer simulation of the thermal-induced phase separation phenomeno...
Article
A model composed of the nonlinear Cahn−Hilliard and Flory−Huggins theories for spinodal decomposition (SD) and a second-order rate equation for polymerization for the self-condensation of a trifunctional monomer is used to study the polymerization-induced phase separation (PIPS) phenomena. The numerical results are consistent with experimental obse...
Article
A model composed of a synthesis of the nonlinear Cahn−Hilliard and Flory−Huggins theories for spinodal decomposition (SD) and a second-order rate equation for the self-condensation of a trifunctional monomer is presented and used to analyze polymerization-induced phase separation (PIPS). The numerical results replicate frequently reported experimen...
Article
In this work a model, composed of the nonlinear Cahn-Hilliard and Flory-Huggins theories, is used to numerically simulate the phase separation and pattern formation phenomena of oligomer and polymer solutions when quenched into the unstable region of their binary phase diagrams. This model takes into account the initial thermal concentration fluctu...
Article
A model, composed of the nonlinear Cahn-Hilliard and Flory-Huggins theories, is used to numerically simulate the phase separation and pattern formation phenomena of a representative oligomer solution when it is quenched into the unstable region of its binary phase diagram. This model incorporates initial thermal concentration fluctuations, which ar...
Article
The magnetically-induced transient nematic director reorientation dynamics, confined in elongated bipolar droplets, is studied in this paper. Numerical results are obtained by solving the Leslie-Ericksen continuum theory in ellipses. The aspect ratio is varied to determine the effect of droplet shape on director reorientation dynamics. The magnetic...

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