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Title: Computational Study of Transport Phenomena and Deformation Behavior of Stimuli Sensitive Hydrogels
Keywords: deformation, hydrogels, model, microvalve, response, stimuli
Issue Date: 5-Aug-2011
Source: JUNDIKA CANDRA KURNIA (2011-08-05). Computational Study of Transport Phenomena and Deformation Behavior of Stimuli Sensitive Hydrogels. ScholarBank@NUS Repository.
Abstract: An understanding of the deformation kinetics and swelling equilibrium behavior is important when designing a system utilizing stimuli-sensitive hydrogels. This research addresses the transport phenomena and deformation behavior of stimuli-sensitive hydrogels with two main objectives: the first involves the study the fundamental physics and chemistry of stimuli-sensitive hydrogels and the associated transport process during swelling and shrinking; the second objective concerns the application of hydrogel in microfluidics field as autonomous microvalve. A mathematical framework model for deformation of hydrogel, which takes into account conservation of mass, momentum, species and energy has been derived and analyzed and validated against experimental equilibrium swelling and deformation kinetics. It is found that deformation behavior of hydrogel is significantly influenced by the bathing environment and physical and chemical nature of the hydrogel. The model is then extended to study the application of hydrogels as autonomous microvalve. The result indicates that the response rate of the hydrogel is slow, which could defeat the flow control purposes. By utilizing scaling analysis, several important factors which determine response rate of hydrogels are identified. Based on this finding, several strategies to improve the response rate of the hydrogels are demonstrated. It is found that the response rate is improved in line with the scaling analysis prediction. Finally, it is noted that the thesis provides basic guidelines for engineers to design systems utilizing stimuli-sensitive hydrogels.
Appears in Collections:Ph.D Theses (Open)

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