2016 Spring Colloidal Engineering (ECH5116)

  • Instructor: Gi-Ra Yi (yigira@skku.edu, 031-290-7289)

  • Teaching Assistant: Inseong Jo (zoinseong@gmail.com)

  • Time: Thuresday 09:00-11:45

  • Class room: 25315

  • Textbook:

    • Colloid Science by Terence Cosgrove (2nd Edition, Wiley) Ebook

    • Soft Matter Physics by Masao Doi (Oxford) Link

  • Schedule:

1. What are Colloids?

2. Brownian Motion and Theraml Fluctuations (Chap 6 in SMP, Ref.: Presentation by Doi)

3. Stability of Charge-stabilized Colloids (vdW force)

4. Stability of Charge-stabilized Colloids (DLVO theory)

5. Polymers at Interfaces and Steric Stabilization

6. Polymers and Polymer Solutions (Depletion Interaction)

7. Ferrofluids and Inverse Ferrofluids

Midterm Exam

8. Synthesis of Monodisperse Colloids (Polymer Colloids)

9. Synthesis of Monodisperse Colloids (Inorganic Colloids)

10. Monodisperse Emulsion

11. Electroosmosis and Electrophoresis

12. Optical Microscopy and Electron Microscopy

13. Static and Dynamic Light Scattering

14. Optical Trapping

Final Exam

  • Grade: Midterm Exam: 40%, Final Exam: 50%, Attendance: 10%

2016  Fluid Mechanics (ECH2007)

  • Instructor: Gi-Ra Yi (yigira@skku.edu, 031-290-7289)
  • Time: Monday 09:00-10:15, Wednesday 10:15-11:45
  • Class room: 26507

2015 ECH203243 Heat and Mass Transfer

  • Instructor: Gi-Ra Yi (yigira@skku.edu, 031-290-7289)
  • Time: Tuesday 09:00-10:15, Thursday 09:00-10:15
  • Class room: 26505
  • Textbook: An Introduction to Mass and Heat Transfer by Stanley Middleman (1998)
  • Schedule
1 week: Fundamentals of Diffusive Mass Transfer (Ch.2) (9/1, 9/3)
               - Video clip on  Diffusion (https://www.youtube.com/watch?v=w4y12u5S0HE)
2 week: Steady, and Quasi-steady Mass Transfer: Mass Balance (Ch.3) (9/8, 9/10)
3 week: Unsteady Steady State (Transient) Mass Transfer  (Ch. 4) (9/15, 9/17)
4 week: Diffusion with Laminar Convection (Ch. 5) (9/22, 9/24)
5 week: Diffusion with Laminar Convection, Continued (Ch. 5) (9/29, 10/1)
6 week: Convective Mass Transfer Coefficients (Ch. 6) (10/6, 10/8)
7 week: Convective Mass Transfer Coefficients, Continued (Ch. 6) (10/13, 10/15)
8 week: Midterm Exam (10/20) (30%)
9 week: Heat Transfer by Conduction (Ch. 10) (10/27, 10/29)
10 week: Transient Heat Transfer by Conduction (Ch. 11) (11/3, 11/5)
11 week:  Transient Heat Transfer by Conduction, Continued (Ch. 11) (11/10, 11/12)
12 week: Convective Heat Transfer (Ch. 12) (11/17, 11/19)
13 week:  Convective Heat Transfer, Continued (Ch. 12) (11/24, 11/26)
14 week: Design of  Heat Exchangers (Ch. 13) (12/1, 12/3)
15 week: Design of  Heat Exchangers, Continued (Ch. 13) (12/8, 12/10)
16 week: Final Exam (12/15) (30%)

  • Term Projects: (report: 25%, presentation: 5%)

  • Attendence: 5%, Homework: 5%

(2014 Spring) Soft Matter Physics


Soft matter is a class of materials which include polymers, colloids, surfactants, and liquid crystals. They are indispensable in our everyday life and in modern technology. For example, gels and creams are soft matter used in our houses, cars, and many other industrial products. Liquid crystals are used in display devices, and IC chips are made with the use of photo-reactive polymers. Furthermore, our body is made of soft matter and a variety of soft matter is used in medical treatments.

Soft matter does not belong to the category of conventional fluids or solids in a simple sense. For example, bubble gum, a soft matter made of polymers, can be stretched indefinitely like a fluid, but it behaves like a rubber when it is stretched and released quickly. Gel is a soft solid which can contain very large amounts of fluids. A liquid crystal is a fluid which has optical anisotropy like a crystal. These properties are important in applications of soft matter. Plastic bottles are made by blowing a liquid of polymers (like a bubble gum), gels are used in many industrial processes, and liquid crystals are used in optical devices.

In this class,  this important class of materials will be introduced from the viewpoint of physics. The properties of soft matter are complex, but they can be understood in terms of physics. The aim of this class is to provide a base for such physical thinking for soft matter.


  • 'Soft Matter Physics' by Masao Doi (2013) [E-book]
  • ‘Intermolecular and Surface Forces’ by Jacob Israelachvili (Wiley, 2011) [E-book]

Course Contents and Schedule

  1. What is Soft Matter
    - What are these materials?
    - What are common characteristics of these materials
    - What is the physics that gives such characteristics to soft matter

  2. Soft Matter Solution 1
  3. Soft Matter Solution 2
  4. Elastic Soft Matter  
  5. Surfaces and Surfactants 1
  6. Surfaces and Surfactants 2
  7. Liquid Crystals
  8. Mid-term Exam 
  9. Brownian Motion and Thermal Fluctuations 
  10. Variational principle in soft matter dynamics 
  11. Diffusion and Permeation in Soft Matter 1
  12. Diffusion and Permeation in Soft Matter 2 
  13. Flow and Deformation in Soft Matter 1
  14. Flow and Deformation in Soft Matter 2 
  15. Ionic Soft Matter 
  16. Final Exam (6/17)