Browsing Waterloo Research by Author "Wen, John Z."
Now showing items 1-12 of 12
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Directed precipitation of anhydrous magnesite for improved performance of mineral carbonation of CO2
Atashin, Sanam; Varin, Robert A.; Wen, John Z. (Elsevier, 2017-08-01)This paper studies the indirect aqueous carbon sequestration via Mg(OH)2 using directed precipitation technique. This technique produces anhydrous MgCO3 (magnesite), the most desirable carbonated phase for sequestration. ... -
Dissimilar joining of carbon/carbon composites to Ti6Al4V using reactive resistance spot welding
Shokati, Ali Akbar; Zhou, Norman Y.; Wen, John Z. (Elsevier, 2019-01-25)A 2D C/C composite with a high porosity (low strength) and a 3D C/C composite with a low porosity (high strength) were investigated for dissimilar joining to Ti6Al4V via reactive spot welding. It was determined that ... -
Highly pressurized partially miscible liquid-liquid flow in a micro-T-junction. I. Experimental observations
Qin, Ning; Wen, John Z.; Ren, Carolyn L. (American Physical Society (APS), 2017-04-24)This is the first part of a two-part study on a partially miscible liquid-liquid flow (liquid carbon dioxide and deionized water) which is highly pressurized and confined in a microfluidic T-junction. Our main focuses are ... -
Highly pressurized partially miscible liquid-liquid flow in a micro-T-junction. II. Theoretical justifications and modeling
Qin, Ning; Wen, John Z.; Ren, Carolyn L. (American Physical Society (APS), 2017-04-24)This is the second part of a two-part study on a partially miscible liquid-liquid flow ( carbon dioxide and deionized water) that is highly pressurized and confined in a microfluidic T-junction. In the first part of this ... -
Hydrodynamic shrinkage of liquid CO2 Taylor drops in a straight microchannel
Qin, Ning; Wen, John Z.; Ren, Carolyn L. (IOP Publishing, 2018-02-12)Hydrodynamic shrinkage of liquid CO2 drops in water under a Taylor flow regime is studied using a straight microchannel (length/width similar to 100). A general form of a mathematical model of the solvent-side mass transfer ... -
Interfacial bonding mechanism in Al/coated steel dissimilar refill friction stir spot welds
Shen, Z.; Ding, Y.; Chen, J.; Amirkhiz, B. Shalchi; Wen, John Z.; Fu, L.; Gerlich, Adrian P. (Elsevier, 2019-06-01)Defect-free dissimilar Al/zinc coated steel and Al/AlSi coated steel welds were successfully fabricated by refill friction stir spot welding. However, Al alloy and uncoated steel could not be welded under the same weldin ... -
Numerical Study on Single Flowing Liquid and Supercritical CO2 Drop in Microchannel: Thin Film, Flow Fields, and Interfacial Profile
Qin, Ning; Feng, Yu; Wen, John Z.; Ren, Carolyn L. (MDPI, 2018-06-01)Taylor segments, as a common feature in two- or multi-phase microflows, are a strong flow pattern candidate for applications when enhanced heat or mass transfer is particularly considered. A thin film that separates these ... -
On nonequilibrium shrinkage of supercritical CO2 droplets in a water-carrier microflow
Qin, Ning; Wen, John Z.; Chen, Baixin; Ren, Carolyn L. (AIP Publishing, 2018-07-16)We report an experimental study on the hydrodynamic shrinkage of supercritical carbon dioxide (scCO(2)) microdroplets during a nonequilibrium process. After scCO(2 )microdroplets are generated by water shearing upon a ... -
Photocatalytic performances of ZnO nanoparticle film and vertically aligned nanorods in chamber-based microfluidic reactors: Reaction kinetics and flow effects
Zhao, Pei; Qin, Ning; Wen, John Z.; Ren, Carolyn L. (Elsevier BV, 2017-07-15)The nanoparticle seed layer (a film) and vertically aligned nanorods of zinc oxide (ZnO) with different lengths were fabricated within a novel chamber-based microfluidic (microchamber) reactor with a varying height of ... -
Polyamide 6.6 separates oil/water due to its dual underwater oleophobicity/underoil hydrophobicity: Role of 2D and 3D porous structures
Zhao, Pei; Qin, Ning; Ren, Carolyn L.; Wen, John Z. (Elsevier, 2019-02-01)Porous polyamide functionalized by plasma or various coatings has been investigated for oil/water separation. In literature, polyamide has rarely been studied for oil removal, and this work investigated the performance of ... -
Polyamide 6.6 separates oil/water due to its dual underwater oleophobicity/underoil hydrophobicity: Role of 2D and 3D porous structures
Zhao, Pei; Qin, Ning; Ren, Carolyn; Wen, John Z. (Elsevier BV, 2019-02-01)Porous polyamide functionalized by plasma or various coatings has been investigated for oil/water separation. In literature, polyamide has rarely been studied for oil removal, and this work investigated the performance of ... -
Synthesis of Vertically-Aligned Zinc Oxide Nanowires and Their Application as a Photocatalyst
Zhou, Qiong; Wen, John Z.; Zhao, Pei; Anderson, William A. (Multidisciplinary Digital Publishing Institute, 2017-01-11)Vertically aligned zinc oxide (ZnO) nanowires were hydrothermally synthesized on a glass substrate with the assistance of a pre-coated ZnO seeding layer. The crystalline structure, morphology and transmission spectrum of ...