@article{budhlall_marquez_velev_2008, title={Microwave, Photo- and Thermally Responsive PNIPAm-Gold Nanoparticle Microgels}, volume={24}, ISSN={["0743-7463"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-55549140819&partnerID=MN8TOARS}, DOI={10.1021/la8019556}, abstractNote={Microwave-, photo- and thermo-responsive polymer microgels that range in size from 500 to 800 microm and are swollen with water were prepared by a novel microarray technique. We used a liquid-liquid dispersion technique in a system of three immiscible liquids to prepare hybrid PNIPAm- co-AM core-shell capsules loaded with AuNPs. The spontaneous encapsulation is a result of the formation of double oil-in-water-in-oil (o/w/o) emulsion. It is facilitated by adjusting the balance of the interfacial tensions between the aqueous phase (in which a water-soluble drug may be dissolved), the monomer phase and the continuous phase. The water-in-oil (w/o) droplets containing 26 wt% NIPAm and Am monomers, 0.1 wt% Tween-80 surfactant, FITC fluorescent dye and colloidal gold nanoparticles spontaneously developed a core-shell morphology that was fixed by in situ photopolymerization. The results demonstrate new reversibly swelling and deswelling AuNP/PNIPAm hybrid core-shell microcapsules and microgels that can be actuated by visible light and/or microwave radiation (<or=1,250 nm) and/or temperature. This is the first study to demonstrate that incorporating AuNPs speeds up the response kinetics of PNIPAm, and hence enhances the sensitivity to external stimuli of PNIPAm. These microgels can have potential applications for microfluidic switches or microactuators, photosensors, and various nanomedicine applications in controlled delivery and release.}, number={20}, journal={LANGMUIR}, author={Budhlall, Bridgette M. and Marquez, Manuel and Velev, Orlin D.}, year={2008}, month={Oct}, pages={11959–11966} }
 @article{marquez_amend_carbonell_saez_roberts_1999, title={Hydrodynamics of gas-lift reactors with a fast, liquid-phase reaction}, volume={54}, ISSN={["0009-2509"]}, DOI={10.1016/S0009-2509(98)00351-0}, abstractNote={The reactive absorption of CO2 into concentrated KOH solutions was studied in an external-loop, gas-lift reactor. Three different inlet gas compositions were used: air, 50–50 vol% air–CO2, and pure CO2. The downcomer liquid velocity and the axial profile of the cross-sectionally averaged gas holdup in the riser were measured. The reaction is so fast that the CO2 is consumed appreciably along the riser, and this causes a significant reduction in the liquid circulation relative to a system with no reaction. A one-dimensional, pseudo-steady-state model has been developed to describe the interactions of hydrodynamics, mass transfer, and chemical reaction for the bubbly flow regime in the riser. The model considers mass transfer from the gas to the liquid phase and its enhancement due to the chemical reaction, and is based on the spatially averaged equations of continuity, momentum, and macroscopic mechanical energy. The rate of liquid circulation, and the axial variation of gas holdup, gas composition, pressure, and gas and liquid velocity, are predicted. The gas/liquid mass transfer coefficient and the bubble radius at the sparger, neither of which was known a priori, were used to minimize the error of the data with respect to the model.}, number={13-14}, journal={CHEMICAL ENGINEERING SCIENCE}, author={Marquez, MA and Amend, RJ and Carbonell, RG and Saez, AE and Roberts, GW}, year={1999}, month={Jul}, pages={2263–2271} }
 @article{roberts_marquez_haney_1999, title={Liquid catalyst interactions in slurry reactors: methanol synthesis over zinc chromite}, volume={183}, ISSN={["0926-860X"]}, DOI={10.1016/S0926-860X(99)00076-9}, abstractNote={The performance of a `zinc chromite' catalyst was studied in a continuous slurry reactor using three different liquids: decahydronaphthalene, tetrahydronaphthalene, and tetrahydroquinoline. The reactor feed was a mixture of hydrogen and carbon monoxide with a H2/CO ratio of either 0.5 or 2. The reactor was operated over a temperature range of 598–698 K and at a total pressure of about 14 MPa. The characteristics of the slurry liquid had a major influence on both the overall reaction rate and the product distribution. The rate of methanol synthesis was much higher when tetrahydroquinoline was used than with the other two liquids. The product distribution was shifted away from oxygenates and towards hydrocarbons when tetrahydronaphthalene was used. The slurry liquid was analyzed by GC/MS (gas chromatography/mass spectrometry) during and after the reaction. There was no evidence of significant cracking or hydrocracking of any of the liquids. However, tetrahydroquinoline was alkylated during the reaction, and tetrahydronaphthalene was dehydrogenated to some extent. Tetrahydroquinoline, and perhaps tetrahydronaphthalene, may have participated in the catalytic cycle.}, number={2}, journal={APPLIED CATALYSIS A-GENERAL}, author={Roberts, GW and Marquez, MA and Haney, CA}, year={1999}, month={Jul}, pages={395–410} }
 @article{saez_marquez_roberts_carbonell_1998, title={Hydrodynamic model for gas-lift reactors}, volume={44}, ISSN={["0001-1541"]}, DOI={10.1002/aic.690440619}, abstractNote={Abstract}, number={6}, journal={AICHE JOURNAL}, author={Saez, AE and Marquez, MA and Roberts, GW and Carbonell, RG}, year={1998}, month={Jun}, pages={1413–1423} }
 @article{roberts_marquez_mccutchen_1997, title={Alcohol synthesis in a high-temperature slurry reactor}, volume={36}, ISSN={["0920-5861"]}, DOI={10.1016/S0920-5861(96)00243-X}, abstractNote={Abstract A family of hydrocarbon liquids has been discovered that is stable at temperatures up to about 400°C in the presence of synthesis gas. The performance of a commercial, ‘zinc chromite’, ‘high pressure’ methanol synthesis catalyst was evaluated in a slurry reactor using two of these liquids, decahydronaphthalene and tetrahydronaphthalene, to suspend the catalyst. The evaluation covered a range of temperatures from 275° to 425°C, total pressures from 6.9 to 17.2 MPa, H2/CO ratios from 0.5 to 2.0 and space velocities from 1500 to 10 000 sl kg(catalyst)−1 h−1. Methanol was the only significant product at the lower end of this temperature range. The methanol synthesis reaction was close to equilibrium at the highest temperature, and there were significant quantities of dimethyl ether, olefins, methane and carbon dioxide in the product. Catalyst performance was sensitive to the composition of the slurry liquid, but was relatively stable in decahydronaphthalene over a long period of time.}, number={3}, journal={CATALYSIS TODAY}, author={Roberts, GW and Marquez, MA and McCutchen, MS}, year={1997}, month={Jun}, pages={255–263} }
 @article{roberts_marquez_mccutchen_haney_shin_1997, title={High-temperature slurry reactors for synthesis gas reactions .1. Liquid thermal stability}, volume={36}, ISSN={["0888-5885"]}, DOI={10.1021/ie970136e}, abstractNote={The use of slurry reactors has been limited to reactions that take place at temperatures below about 573 K because many of the liquids that have been used to suspend the solid catalyst are not stable above this temperature. The thermal stability of a number of organic liquids was evaluated at temperatures between 648 and 698 K and at H2 partial pressures of about 7 MPa. Certain saturated and partially-saturated, fused-ring compounds with no alkyl groups or bridges are quite stable at these conditions. Of the compounds tested, tetrahydronaphthalene, tetrahydroquinoline, and decahydronaphthalene were the most stable. Analysis of the liquids at the end of the thermal stability evaluation supports some speculation concerning possible degradation reactions.}, number={10}, journal={INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH}, author={Roberts, GW and Marquez, MA and McCutchen, MS and Haney, CA and Shin, ID}, year={1997}, month={Oct}, pages={4143–4154} }