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4 results on '"Zhong, C. J."'

1. Electrochemically actuated mercury pump for fluid flow and delivery

Author

Ni, J, Zhong, C. J, Coldiron, S. J, and Porter, M. D

Subjects
Life Sciences (General)
Abstract

This paper describes the development of a prototype pumping system with the potential for incorporation into miniaturized, fluid-based analytical instruments. The approach exploits the well-established electrocapillarity phenomena at a mercury/electrolyte interface as the mechanism for pump actuation. That is, electrochemically induced changes in the surface tension of mercury result in the pistonlike movement of a mercury column confined within a capillary. We present herein theoretical and experimental assessments of pump performance. The design and construction of the pump are detailed, and the potential attributes of this design, including the generated pumping pressure, flow rate, and power consumption, are discussed. The possible miniaturization of the pump for use as a field-deployable, fluid-delivery device is also briefly examined.

Published
2001
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2. From Ultrafine Thiolate-Capped Copper Nanoclusters toward Copper Sulfide Nanodiscs: A Thermally-Activated Evolution Route

Author

STATE UNIV OF NEW YORK AT BINGHAMTON, Mott, D., Yin, J., Engelhard, M., Loukrakpam, R., Chang, P., Miller, G., Bae, I., Das, N., Wang, C., Zhong, C. J., STATE UNIV OF NEW YORK AT BINGHAMTON, Mott, D., Yin, J., Engelhard, M., Loukrakpam, R., Chang, P., Miller, G., Bae, I., Das, N., Wang, C., and Zhong, C. J.

Abstract

The report shows the size, shape, and composition of pre-synthesized copper nanoparticles can be nanoengineered through exploiting concurrent interparticle coalescence and interfacial carbon-sulfur cleavage in a thermally-activated evolution route. This is demonstrated by thermally-activated processing ofultrafme copper nanoclusters encapsulated with thiolate monolayer toward semiconducting copper sulfide nanodiscs with controllable sizes and shapes. The nanodiscs exhibited controllable and monodispersed sizes depending on the thermal processing parameters, ranging from 5 to 35 nm in disc dimension and 3 to 6 nm in the thickness dimension. These nanodics are stable and display remarkable ordering upon self-assembly. The coupling of the thermally-activated coalescence and C-S bond cleavage to convert the ultrafme Cu nanoclusters toward the formation of copper sulfide nanodiscs is unprecedented for tuning nanoscale size, shape and composition, and could fmd applications in nanoengineering a variety of semiconducting nanocrystals for applications in nanostructured electronic, sensing, and photochemical devices., Pub. in Chemistry Materials, v22, p261-271, 2010.

Published
2009

3. Interfacial Mass Flux at 11-Mercaptoundecanoic Acid Linked Nanoparticle Assembly on Electrodes

Author

Luo, J., Kariuki, N. N., Han, L., Maye, M. M., Moussa, L. W., Kowaleski, S. R., Kirk, F. L., Hepel, M., and Zhong, C. J.

Abstract

Thin films derived from nanocrystal cores and functionalized linkers provide a large surface area-to-volume ratio and three-dimensional ligand framework. This paper describes the results of an investigation of the interfacial mass flux and binding properties of such thin films using an electrochemical quartz crystal nanobalance technique. The hydrogen-bonding assembly from gold nanocrystals and 11-mercaptoundecanoic acid was studied as a model system. The results reveal four distinctive mass response characteristics upon pH tuning or metal ion binding. First, the protonation−deprotonation characteristic of the carboxylic acid groups in the nanostructured framework is dependent on particle core size and film thickness. Second, the pH-tunable cationic redox reaction across the electrode|film|electrolyte interface is accompanied by a large cationic electrolyte mass flux. Third, the spontaneous complexation to copper ions by the nanostructured carboxylate framework is reflected by a mass increase of the film. Fourth, the redox reaction of copper loaded in the nanostructured film is accompanied by fluxes of electrolyte cations across the electrode|film|electrolyte interface which compensate electrostatically the fixed negative charges. On the basis of the mass change detected in the presence of a series of electrolyte cations, a linear relationship was determined between the mass increase and the atomic mass of the cation, and a concurrent flux of solvent molecules was also revealed. Implications of the findings to the delineation of the design parameters of the nanostructured ligand framework for controlled release and environmental monitoring or removal of metals are also discussed.

Published
2002
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4. [Application and effect observation of hybrid aortic stent grafts for endovascular repair in the treatment of complicated infrarenal abdominal aortic aneurysm].

Author

Yu XQ, Yue JN, Dong ZH, Liu Y, Lu CX, Zhong CJ, and Fu WG

Subjects
Aorta, Abdominal surgery, Endoleak, Humans, Iliac Artery pathology, Length of Stay, Retrospective Studies, Stents, Treatment Outcome, Aortic Aneurysm, Abdominal surgery, Blood Vessel Prosthesis, Blood Vessel Prosthesis Implantation, Endovascular Procedures
Abstract

Objective: To evaluate the effectiveness of the hybrid graft technique for complicated infrarenal abdominal aortic aneurysms (AAAs)., Methods: The clinical data of 183 patients who underwent endovascular aneurysm repair (EVAR) for AAA with challenging anatomy at Zhongshan Hospital Affiliated to Shanghai Fudan University from 2010 to 2015 were retrospectively analyzed. Endografts were divided into two groups: Hybrid Group (28 cases) used more than one type of stent graft, and Standard Group (110 cases) used only one stent graft type. Patients were recommended to undergo CT angiography at 1, 3, 6, 12 month after the procedure. Clinical data were analyzed with a focus on postoperative hospital stay, endoleak, limb occlusion, complications of approach, complications of system, converted to open operation and secondary intervention., Results: Technical success was achieved in all patients in both groups. Compared with hybrid group and standard group, there was no difference in postoperative hospital stay ((5.35±2.99) and (5.92±3.70) days, t=0.753, P>0.05). During the follow up, there was no difference in endoleak (10.7% and 18.2%), limb graft occlusion (3.6% and 10.9%), complications of approach (0 and 1.8%), complications of system (7.1% and 0.9%), converted to open operation (0 and 0.9%) between two groups (χ(2)=0.896, 1.408, 0.517, 4.078, 0.256, all P>0.05). However, there was statistically significant difference in secondary intervention between two groups (3.6% and 19.1%, 2=4.011, P<0.05)., Conclusion: The use of hybrid stent graft in patients with unfavorable neck and iliac artery anatomy AAA is feasible, and it could improve the postoperative outcomes such as secondary intervention rate.

Published
2016
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