Citation
Viscous Effects Of Ethylene Glycol In The Electrodeposition Of Copper In A Cu-Cu Electrochemical System

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Title:
Viscous Effects Of Ethylene Glycol In The Electrodeposition Of Copper In A Cu-Cu Electrochemical System
Series Title:
19th Annual Undergraduate Research Symposium
Creator:
Juarez, Juan
Language:
English
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Undetermined

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Center for Undergraduate Research
Center for Undergraduate Research
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Conference papers and proceedings
Poster

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Abstract:
Electrodeposition is the process by which metal ions are deposited by reduction onto a cathode surface. Different instability phenomena affect how these patterns form and which morphologies are observed. Surface tension plays an important role in the formation of patterns. As such, this paper seeks to understand the changes in pattern morphology that should be observed in an electrochemical cell when changing the surface tension of the electrolyte solution by changing its viscosity. Surface tension and viscosity are known to be related, and as one changes the other should change as well. Ethylene glycol has been chosen for the purposes of this experiment. When added in a weight percent basis to the electrolyte solution, changes in morphology were indeed observed. Reduction in dendrite formation, and more defined patterns were found. Overall, it was observed that as ethylene glycol increased in weight concentration, viscosity increased, ion conductivity decreased, lower current outputs were observed, and dendrite formation reduced due to a decrease in mass convection. ( en )
General Note:
Research authors: Juan J. Juarez, Dr. Kirk Ziegler, Chun-Chieh Wang, Dr. Ranga Narayanan - University of Florida
General Note:
FGLSAMP
General Note:
Faculty Mentor: Electrodeposition is the process by which metal ions are deposited by reduction onto a cathode surface. Different instability phenomena affect how these patterns form and which morphologies are observed. Surface tension plays an important role in the formation of patterns. As such, this paper seeks to understand the changes in pattern morphology that should be observed in an electrochemical cell when changing the surface tension of the electrolyte solution by changing its viscosity. Surface tension and viscosity are known to be related, and as one changes the other should change as well. Ethylene glycol has been chosen for the purposes of this experiment. When added in a weight percent basis to the electrolyte solution, changes in morphology were indeed observed. Reduction in dendrite formation, and more defined patterns were found. Overall, it was observed that as ethylene glycol increased in weight concentration, viscosity increased, ion conductivity decreased, lower current outputs were observed, and dendrite formation reduced due to a decrease in mass convection. - Center for Undergraduate Research, FGLSAMP

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University of Florida
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Copyright Juan Juarez. Permission granted to University of Florida to digitize and display this item for non-profit research and educational purposes. Any reuse of this item in excess of fair use or other copyright exemptions requires permission of the copyright holder.

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Viscous Effects of Ethylene Glycol in the Electrodeposition of Copper in an Electrochemical System e Juan J. Juarez, Dr. Kirk Ziegler, Chun Chieh Wang, Dr. Ranga Narayanan, Matthew Mango University of Florida Department of Chemical Engineering Electrodeposition is the process by which metal ions are deposited by reduction onto a cathode surface. !" # $ % !" & ( )* + -. / % (01234+ The research at hand seeks to investigate the effect of changing the surface tension of the electrolyte by changing its viscosity and observing changes in electrodeposition patterns. 56 7 8 56 9 : ; Through literature review, ethylene glycol confirmed to be a good solute to change the viscosity of the electrolyte solution. Introduction 0 3 < = >0 >>3 >< >= -0 0 01013 01< 01= > Viscosity [ cp ] Mole Fraction of Glycols Ethylene Glycol Triethylene Glycol Polyethylene Glycol I would like to thank my research team and mentors, my friend Dr. Soofi for her unconditional support, and the Center of Undergraduate Research at UF for their patronage. Acknowledgements Figure 1. Viscosity vs. concentration for glycol water systems at 25 C An analysis of changes in surface tension, ion conductivity, and current behavior with the addition of ethylene glycol will be the purpose of these experiments to better understand observed changes in electrodeposition morphology. Objective I. The electrochemical cell has two pairs of nails spaced at 1 cm each. II. One piece of glass is placed on the substrate, held in place by polyimide tape. III. Two strips of copper wire were wrapped around the nails tightly, parallel to each other. IV. An additional glass was placed on top of the wires and held in place with polyimide tape. V. An electrolyte solution of 0.1M CuSO 4 was injected with the corresponding weight fraction of ethylene glycol. VI. The cell was sealed with epoxy, and allowed to dry for 10 minutes. Electrochemical Cell Design Figure 2. Schematic of the electrochemical cell Data Collection Procedure I. A potential difference of 1V was applied using DC voltage. II. The cell was placed under a camera based microscope. III. A level was used to ensure that the cell was perpendicular to the microscope. IV. The camera was programmed to take pictures for different time intervals depending on the length of the experiment. V. Current measurements were collected over the course of the experiment, using total charge as markers of interest. To set up a model for analysis, a control experiment with 0.1M CuSO 4 and no ethylene glycol can be used. Figures 4a 4c attempt to demonstrate a qualitative model to determine when dendrite formation has occurred. Figure 4a and 4c are the extremes, and Figure 4b is the target model to look for in the experiments. d Figure 4 (a c). Control experiment using 0.1M CuSO 4 and no ethylene glycol. a b c The resulting dendritic patterns were obtained at a total charge marker of Q=0.53C. Figure 5a represents the 0wt% ethylene glycol electrolyte and Figure 5f represents the 50 wt% ethylene glycol electrolyte. Figure 5 (a f). Patterns formed at a total charge of Q=.053 C. Pictures a f show the different weight concentrations of ethylene glycol, with picture a being the control experiment of 0 wt% and picture f being 50 wt%. Results a b c d e f [1] Chun Chieh Wang, Verification of Electrodeposition Patterns Caused by Interfacial Instability ," Ph.D. dissertation, Dept. of Chemical Eng., University of Florida, Gainesville, Fl. [2] A.H. Pelofsky, Surface Tension Viscosity Relation for Liquids ," J. Chem. Eng. Data, vol.11, no.3, pp.394 397, July 1966. [3] F.S. Jerome, J.T. Tseng, L.T. Fan, Viscosities of aqueous glycol solutions ," J. Chem. Eng. Data, vol.13, no.4, pp.496, Oct. 1968. References Figure 6 displays the relationship between current and elapsed time. This graph provides meaningful information about the initial current and the current progression throughout the experiment. Figure 6. Current versus elapsed time. Figure 7 demonstrates the relationship between charge and elapsed time. The graph is useful to understand how the kinetics and mass transfer are affected by addition of ethylene glycol. d Figure 9. Elapsed time versus total charge. Discussion 010?,00 -10?@0A 310?@0A <10?@0A =10?@0A >10?@03 >1-?@03 0 -00 300 <00 =00 >000 Current [A] Elapsed Time [s] 0%BCD >0%BCD -0%BCD 30%BCD A0%BCD <0%BCD 01?,00 -1?,02 31?,02 <1?,02 =1?,02 >1?,03 !"!# !"!$ !"!% Elapsed Time [s] Charge [C] 0%BCD >0%BCD -0%BCD 20%BCD 30%BCD A0%BCD <0%BCD Viscosity increased Ion conductivity decreased due to the increased resistance from the electrolyte solution Dendrite formation reduced due to a decrease in mass convection (Figure 5a f) Lower current outputs were observed (Figure 6) Longer time intervals were required to reach the same charge marker (Figure 7) As ethylene glycol increased in weight concentration