Chemical microreactors offer opportunities for portable power generation, on-site
waste remediation and point-of-use chemical synthesis. Much of the existing
development of microreactor devices involves silicon-based microfabrication techniques.
It is recognized that new refractory materials are important to realizing high-temperature
microreactors. Requirements of these materials include high-temperature resistance,
chemical inertness and...
Sulfur content of fuels and desulfurization of fuels is becoming an
important environmental restriction and regulatory issue. In this study new
technology for the desulfurization of fuels is considered. Micro scale reactors are
introduced for desulfurization of thiophene and dibenzothiophene.
Thiophene and dibenzothiophene are mixed with hexane at concentration, C₀...
An experimental investigation into the behavior of micro-bubbles flowing
through a micro-channel has been conducted. Experiments were performed within a
rectangular micro-channel with dimensions of 5 cm x 13.2 mm x l30 jim. Bubbles
were generated in an electrolyte solution by electrolysis at the lower channel wall near
the inlet....
The parallel implementation of a large number of functional units is necessary for
any industrial scale microfluidic process. The concept of a 'numbering up'
strategy where a single highly optimized functional unit that has a low individual
production is replicated a large number of times to create a device that...
Micro Powder injection molding (μPIM) is a cost-effective technique for
producing small, complex, precision parts in high volumes from ceramic and
metal nanoparticles. This study focuses on research conducted on fabrication of
Micro Ceramic Arrays (MCAs) parts using μPIM. MCAs are widely used as the
major components and design features...
Recent efforts show that microchannel technologies have much to offer the field of nanomanufacturing: the structuring of matter on the order of one billionth of a meter. During the synthesis of nanomaterials, microchannel reactors take advantage of large surface-to-volume ratios to accelerate heat and mass transport. This accelerated transport allows...
Concentrically arranged multiple-tube reactors with different dimensions were
built for synthesizing nano-sized silicon nitride powder via the ammonolysis of SiO
vapor. The reaction was operated at temperatures ranging from 1350 to 1400°C and
pressure slightly above atmospheric pressure. Silicon monoxide (SiO) vapor was
generated by charging argon gas through a...
A non-intrusive measurement technique for direct quantitative thermal visualization of channel wall temperatures in two phase microchannel flows using infrared thermography (IRT) is presented. Specifically, the measurement of top channel wall temperatures in a fractal-like branching microchannel silicon heat sink during flow boiling is demonstrated and thoroughly documented. Obtaining quantitative...
Sulfur content in fuels is an increasingly critical environmental issue. Hydrodesulfurization removes sulfur from hydrocarbons; however, further desulfurization is necessary in fuels. New methods are required. In this study, micro-scaled single phase oxidative desulfurization is explored. An ultraviolet light-assisted micro-reactor is introduced for desulfurization of dibenzothiophene.
Dibenzothiophene is mixed with...
The critical contribution of this dissertation is to provide a better
understanding of the fundamental Chemical Bath Deposition (CBD) growth
kinetic and mechanism for the well known II-VI semiconductor CdS using the
newly developed continuous flow microreactor. This continuous flow microreactor
provides the temporal resolution to control the homogeneous reaction...
Four types of microchannel reactors were built, using a combination of smallest alumina-tubes commercially available, for testing the feasibility of applying high-temperature microchannel reactors to the ammonolysis of SiO for producing nano-sized silicon nitride powder. The innermost tube used for feeding SiO vapor had an inner diameter (ID) of about...