Self-Assembly of Colloidal Systems and Its Application Keng-hui Lin 林耿慧 Institute of Physics Academia Sinica.

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Presentation transcript:

Self-Assembly of Colloidal Systems and Its Application Keng-hui Lin 林耿慧 Institute of Physics Academia Sinica

Outline  Overview of Soft Condensed Matter Physics  Colloidal Systems  Entropy Driven Phenomena  Packing in Confined Space  Application in Tissue Engineering

Overview of Soft Condensed Matter Definition: Physics of the system with the energy scale of k B T. The systems of interests include colloids, polymers, liquid crystals, emulsions, membranes, proteins, cells, etc.. Self-Assembly

Examples of Colloidal Systems Examples – paint, proteins, ink, nanoparticles, e-paper etc. Narrow Definition: Solid particles dispersed in liquid Broad Definition: Two immiscible phases uniformly dispersed to each other

Scientific Importance – Jean Perrin, 1911 Nobel Laureate, the first hard sphere system, model system Interparticle Interactions – electrostatic, van der Waal Interaction, hydrodynamic, entropic…etc. Shapes – spheres, rod, blobs... 2a Physical Properties of Colloidal Systems Phase behavior: F=U-TS

Self-Assembly of Collodial Crystals Optimal packing to maximize entropy Is fcc/hexagonal closed pack volume fraction

Depletion Interactions

180 Hz Line-Scanned Optical Tweezers

Find the centroids of colloids Measure the separation of two beads 30 minutes video tape -> 10 5 measurements The probability of separation Spatial resolution ~ 30 nm, Energy resolution ~0.05 k B T Video Microscopy

buffer fd Buffer potential -- optical potential U fd =U optical +U dep Differential Measurement

1.0  m particles YJM model L=0.88  m fd Depletion Interactions

A.D. Dinsmore, A.G. Yodh, and D.J. Pine, Nature, 383, 239 (1996), Langmuir 15, 314 (1999). Control the positions of colloids by surface topology Depletion Interactions with Structures

J. Vac. Soc. Tech. B. 15, 2897 (1997), Steve Chou et al. AFM pictures of imprint templates p=0.46 micron p=0.83 micron thermal imprint Imprint with Gratings

2D Structures on Line Gratings

2D structures on Crossed Gratings

FCC Crystals Confocal picture of FCC crystals

Colloids Entrapped In Emulsions V.N. Manoharan, M.T.Elsesser, D.J. Pine Science (2003)

Colloids in Small Confines with Depletion Interactions Different packing from the one without depletion interactions

Paradigm of Tissue Engineering Scaffold Scaffold Drug, nutrition, … Cells

Making of Bubbles with Flow-focusing Microfluidic Device

Making of 3D ordered porous foam

Cell Encapsulation

Conclusions  Advanced optical microscopy  The role of entropy  Assembly of different micro- structures  The interplay between cells and the microstructure environment

Group