# Coursebooks

## Physical chemistry of interfaces

#### Lecturer(s) :

Hagfeldt Ulf Anders

English

#### Summary

Acquire an understanding of interfacial phenomena, micro-heterogeneous colloidal solution systems and dynamic electrochemistry.

#### Content

1. Thermodynamics of interfaces
Interfacial tension and surface thermodynamic functions, Laplace pressure, spreading and wetting, contact angle (Young-Dupré equation), capillary ascension, vapor pressure of curved interfaces (Kelvin equation).

2. Colloids/Micelles
Gibbs adsorption equation, solutions of amphiphile molecules (surfactants), hydrophobic effect, micelle formation, critical micellar concentration. Monomolecular Langmuir-Blodgett films.

Langmuir, Fowler-Guggenheim and BET isotherms. Adsorption of gases on porous solids, capillary condensation in mesoporous particles.

4. Electrokinetic phenomena
Zeta potential, electro-osmosis and electrophoresis, streaming and sedimentation potentials.

5. Interfaces
Stability of colloids according to the DLVO model. Membrane potential, Goldman's equation.

6. Dynamic electrochemistry
Redox potentials, Nernst equation, mass transport, chronoamperometry, voltammetry, Butler-Volmer equation, three-electrode measurements

#### Keywords

Surface tension.

Micelles.

Isotherms.

Electrokinetic phenomena

Colloidal stability

Membrane potential

Dynamic electrochemistry

Thermodynamique

#### Learning Outcomes

By the end of the course, the student must be able to:
• Formulate Formulate the thermodynamic definition of the surface tension
• Derive Derive the equations related to the surface tension (Young-Laplace, Kelvin, etc.)
• Establish Establish Gibb's adsorption equation
• Discuss Discuss the properties of surfactant solutions
• Derive Derive the expressions of the adsorption isotherms
• Derive Derive the equations relative to the electrokinetic phenomena
• Discuss Discuss the stability of colloids according to the DLVO model
• Formulate Formulate models and methods in dynamic electrochemistry

#### Transversal skills

• Use a work methodology appropriate to the task.
• Assess one's own level of skill acquisition, and plan their on-going learning goals.

#### Teaching methods

Lectures and exercies.

#### Expected student activities

Reading the lecture notes and solving the exercises

#### Assessment methods

Written examination

#### Supervision

 Office hours No Assistants Yes Forum No

#### Resources

##### Bibliography

Handouts and exercises.

### In the programs

• Semester
Spring
• Exam form
Written
• Credits
3
• Subject examined
Physical chemistry of interfaces
• Lecture
2 Hour(s) per week x 14 weeks
• Exercises
1 Hour(s) per week x 14 weeks
• Passerelle HES - CGC, 2019-2020, Spring semester
• Semester
Spring
• Exam form
Written
• Credits
3
• Subject examined
Physical chemistry of interfaces
• Lecture
2 Hour(s) per week x 14 weeks
• Exercises
1 Hour(s) per week x 14 weeks

### Reference week

MoTuWeThFr
8-9
9-10
10-11
11-12
12-13
13-14
14-15
15-16
16-17
17-18
18-19
19-20
20-21
21-22
Under construction

Lecture
Exercise, TP
Project, other

### legend

• Autumn semester
• Winter sessions
• Spring semester
• Summer sessions
• Lecture in French
• Lecture in English
• Lecture in German