Electric Double Layer and Triple Layer Model.pptx

EDL and TLM.

1. Ivyleen C. Bernardo - Arugay, PhD Faculty of the Department of Materials and Resources Engineering & Technology Project Leader of DOST PCIEERD funded project on CAPPS: DEVELOPMENT OF ALTERNATIVE CERAMIC ….” in collaboration with Philippine National Agencies, ICPO, WHK and ABGM Project Leader of DOST YIP 2021-2022 research grant on GCAP in collaboration with BS CERAMIC ENGINEERING STUDENTS Roben Victor Dispo, Sherlyn Keh Dionio and Christian Julle Saladaga Research Collaborator of UKRI-NERC DOST PPD Grant for SAGES: Systems Approach for Greener, Eco-efficient and Sustainable Mineral Resource Management in collaboration with Imperial College London, The Natural History Museum UK, University of New South Wales, Curtin University, University of Edinburgh, DLSU, CMU, CCC, AMVI Project Leader of DOST PCIEERD funded Project 3 on RECOVERY OF NANOMINERALS AND MINERALS FROM SILT FOR VARIOUS CERAMIC APPLICATIONS under the Research Program on 3R APPROACH on SUSTAINABLE MANAGEMENT of NICKEL LATERITE ORE MINING WASTE: REUSE, RECYCLE, REPROCESSING for ENVIRONMENTAL REMEDIATION and MATERIAL VALORIZATION in collaboration with De La Salle University, Central Mindanao University and Agata Mining Ventures Incorporation Commission on Higher Education CHED, MEMBER, Technical Panel for Engineering and Technology TPET CER158: ELECTROCERAMICS PROCESSING & CHARACTERISATION Module 2-A HONOR SERVICE EXCELLENCE COMPASSION RESILIENCE INNOVATION

2. GUIDELINES Filename: CER158_familyname1_familyname2_familyname3 M2-A Due BEFORE FEBRUARY 25 2025 Observe proper citation. Use “ANSWER SLIDE” provided for your answers. Upload peer evaluation on your respective google folder (NA) SUBMITTED TO: Prof. Ivyleen B. Arugay SUBMITTED BY: Rodric Luceño CER158: ELECTROCERAMICS PROCESSING & CHARACTERISATION Module 2-A HONOR SERVICE EXCELLENCE COMPASSION RESILIENCE INNOVATION

3. Reconstruct the simplest model for the Electric Double Layer EDL. Use and enhance the available figure for your reference. Image of Product 1 Use this box for your answers of the following tasks: a. Label and Identify the essential parts of EDL. 20pts. b. Describe the EDL. 30 pts. CER158: ELECTROCERAMICS PROCESSING & CHARACTERISATION Module 2-A HONOR SERVICE EXCELLENCE COMPASSION RESILIENCE INNOVATION

4. ANSWER SLIDE (Observe proper citation) Put here Reconstructed EDL model CER158: ELECTROCERAMICS PROCESSING & CHARACTERISATION Module 2-A HONOR SERVICE EXCELLENCE COMPASSION RESILIENCE INNOVATION Filename: CER158_Luceño M2-A Use this box for your answers of the following tasks: 1. Stern Layer (Inner Layer) Components: Specifically adsorbed ions (counter-ions) that are tightly bound to the electrode surface. 2. Diffuse Layer (Outer Layer) Components: Loosely bound counter- ions and co-ions distributed according to a Boltzmann distribution. b. The Electric Double Layer (EDL) refers to the structure that forms at the interface between a solid surface and a liquid containing ions, commonly observed in electrochemical systems such as batteries, supercapacitors , and colloidal dispersions. Reconstruct the simplest model for the Electric Double Layer EDL. Use and enhance the available figure for your reference.

5. Reconstruct the Triple layer model TLM. Use the available image as your reference. Use surface of a quartz particle. Image of Product 1 CER158: ELECTROCERAMICS PROCESSING & CHARACTERISATION Module 2-A HONOR SERVICE EXCELLENCE COMPASSION RESILIENCE INNOVATION Use this box for your answers of the following tasks: a. Label and Identify the essential parts of EDL. 20 pts. b. Describe the EDL. 30 pts.

6. Reconstruct the Triple layer model TLM. Use the available image as your reference. Use surface of a quartz particle. CER158: ELECTROCERAMICS PROCESSING & CHARACTERISATION Module 2-A HONOR SERVICE EXCELLENCE COMPASSION RESILIENCE INNOVATION Use this box for your answers of the following tasks: 1. I nner Helmholtz Plane (IHP)Components: Specifically adsorbed ions (without their hydration shells), including potential-determining ions like H⁺ and OH⁻. 2. Outer Helmholtz Plane (OHP)Components: Non-specifically adsorbed counter-ions that retain their hydration shells. 3. Diffuse Layer ( Gouy -Chapman Layer)Components: A mix of mobile counter-ions and co-ions distributed according to electrostatic forces. b. The Triple Layer Model (TLM) is an advanced electrochemical model that describes the electric double layer (EDL) at the solid-liquid interface. It is an extension of the Stern model , incorporating three distinct layers to better account for specific ion adsorption and surface charge interactions . Put here Reconstructed TLM ANSWER SLIDE (Observe proper citation) Filename: CER158_Luceño M2-A

7. ANSWER SLIDE (Observe proper citation) Compare and Contrast simple EDL model and TLM. HONOR SERVICE EXCELLENCE COMPASSION RESILIENCE INNOVATION INSERT FILENAME: CER158_Luceño M2-A (identify at least 5 similarities) 1. Describe s Surface Charge Separation: Both models explain how charge separation occurs at the interface between a solid surface and an electrolyte solution. 2. Consider s the Helmholtz Plane: The EDL has a Stern layer, which includes the Helmholtz plane, while the TLM refines this concept by introducing Inner Helmholtz Plane (IHP) and Outer Helmholtz Plane (OHP). 3. Explain s Ion Distribution in Electrolyte Solutions: Both models describe how counter-ions and co-ions arrange themselves near a charged surface to maintain electrostatic balance. 4. Affect s Electrokinetic Phenomena: The zeta potential, electrophoretic mobility, and adsorption behaviors predicted by the EDL and TLM influence processes such as colloidal stability and mineral flotation. 5. Used in Electrochemistry and Surface Science: Both models help in studying electrode-electrolyte interfaces, adsorption of ions, and surface reactions, which are important in batteries, sensors, and environmental chemistry . (identify at least 5 differences) 1. The EDL consists of two layers (Stern layer and diffuse layer) while the TLM consists of three layers (Inner Helmholtz Plane (IHP), Outer Helmholtz Plane (OHP), and diffuse layer). 2. The EDL does not differentiate between specifically and non-specifically adsorbed ions while the TLM differentiates between ions that are strongly adsorbed (IHP) and loosely associated (OHP). 3. The EDL uses two capacitances (Stern layer and diffuse layer) while TLM uses three capacitances, accounting for both Helmholtz planes separately. 4. EDL provides a simpler model, often sufficient for basic electrochemical analysis while TLM provides a more detailed and accurate, especially for modeling adsorption and surface reactions. 5. EDL is commonly used in electrochemistry, supercapacitors , and zeta potential calculations while TLM is used in surface science, mineral processing, and adsorption studies to describe ion-surface interactions more precisely . CER158: ELECTROCERAMICS PROCESSING & CHARACTERISATION Module 2-A

8. ANSWER SLIDE (Observe proper citation) Define electrophoretic mobility and zeta potential HONOR SERVICE EXCELLENCE COMPASSION RESILIENCE INNOVATION INSERT FILENAME: CER158_Luceño M2-A CER158: ELECTROCERAMICS PROCESSING & CHARACTERISATION Module 2-A term definition References [specify #] Electrophoretic mobility (1 st ) Electrophoretic mobility is the velocity of a charged particle per unit electric field strength, determined by the balance of electrostatic and hydrodynamic forces acting on the particle. Hunter, R. J. (2001). Foundations of colloid science (2nd ed.). Oxford University Press . (2 nd ) Electrophoretic mobility ( μ) is the ratio of the velocity of a particle in an electric field to the applied field strength, influenced by particle charge, size, and medium viscosity. Delgado, Á. V., González-Caballero, F., Hunter, R. J., Koopal , L. K., & Lyklema , J. (2007). Measurement and interpretation of electrokinetic phenomena. Journal of Colloid and Interface Science, 309 (2), 194–224 . (3 rd ) Electrophoretic mobility is the observable motion of dispersed charged particles in response to an applied electric field, fundamental in colloid science and electrokinetics . Lyklema , J. (1995). Fundamentals of interface and colloid science: Volume 2 - Solid-liquid interfaces . Academic Press . Zeta potential (1 st ) (2 nd ) (3 rd )

9. ANSWER SLIDE (Observe proper citation) Define electrophoretic mobility and zeta potential HONOR SERVICE EXCELLENCE COMPASSION RESILIENCE INNOVATION INSERT FILENAME: CER158_Luceño M2-A CER158: ELECTROCERAMICS PROCESSING & CHARACTERISATION Module 2-A term definition References [specify #] Zeta Potential (1 st ) Zeta potential is the electrostatic potential at the slipping plane of a colloidal particle, influencing stability and aggregation in dispersions. Hunter, R. J. (1981). Zeta potential in colloid science: Principles and applications . Academic Press. (2 nd ) Zeta potential is the electrical potential difference between the dispersion medium and the stationary layer of fluid attached to the particle surface, affecting electrophoresis and electrokinetics . Dukhin , S. S., & Derjaguin , B. V. (1974). Electrophoresis: Surface conductivity of colloid particles . Springer. (3 rd ) Zeta potential is a key parameter in electrokinetic phenomena, defined as the potential at the plane where the Stern layer transitions into the diffuse double layer. Ohshima, H. (2006). Theory of colloid and interfacial electric phenomena . Elsevier . Zeta potential (1 st ) (2 nd ) (3 rd )

10. ANSWER SLIDE (Observe proper citation) References: Specify the references of each output. Hunter, R. J. (2001). Foundations of colloid science (2nd ed.). Oxford University Press. Lyklema , J. (1995). Fundamentals of interface and colloid science: Volume 2 - Solid-liquid interfaces . Academic Press. Delgado, Á. V., González-Caballero, F., Hunter, R. J., Koopal , L. K., & Lyklema , J. (2007). Measurement and interpretation of electrokinetic phenomena. Journal of Colloid and Interface Science, 309 (2), 194–224 Stumm , W., & Morgan, J. J. (1996). Aquatic chemistry: Chemical equilibria and rates in natural waters (3rd ed.). Wiley. Hiemstra , T., & Van Riemsdijk , W. H. (1996). A surface structural approach to ion adsorption: The charge distribution (CD) model. Journal of Colloid and Interface Science, 179 (2), 488-508. CER158: ELECTROCERAMICS PROCESSING & CHARACTERISATION Module 2-A HONOR SERVICE EXCELLENCE COMPASSION RESILIENCE INNOVATION Filename: CER158_Luceño M2-A