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Title: self assembly process


1
SELF-ASSEMBLED STRUCTURES
GRAVITATIONAL FIELD ASSISTED ASSEMBLY
2
What is Self-Assembly.???
Self-assembly is a type of process in which a
disordered system of pre-existing components
forms an organized structure or pattern as a
consequence of specific, local interactions among
the components themselves, without external
direction. 
3
In Other Words..
Self-assembly is a phenomenon where the
components of a system assemble themselves
spontaneously via an interaction to form a larger
functional unit.
4
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5
Types Of Self-Assembled Structure
  • Capillary Forces
  • Dispersion Interactions
  • Shear Forced Assisted Assembly
  • Electric-field Assisted Assembly
  • Covalently Linked Assembly
  • Gravitational Field Assisted Assembly
  • Template Assisted Assembly

6
Parameters
  • Order
  • Interaction
  • Building Blocks
  • Rate of Sedimentation

7
Gravitational Field Assisted Assembly
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  • It is also called as Field Assisted Assembly
  • To produce ordered aggregates of molecules and
    colloidal particles
  • It is an Bottom-up approach
  • The sedimentation process should be slow enough
    so that the colloids concentrated at the bottom
    of the container
  • It will undergo a hard-sphere disorder-to-order
    phase transition to form a 3-D ordered structure

9
To Improve Results
  • Field can accelerate ordering by improving the
    kinetics of assembly
  • Fields can potentially shift order-disorder
    transition boundaries
  • Generating spatial gradient

10
Factors To Be Considered
  • Sedimentation in a gravitational field involves
    a coupling between Brownian motion, which is a
    function of temperature, and gravitational
    settling
  • Sedimentation velocity is influenced by
    particle size and density
  • To achieve minimum energy lattice position

11
Advantages
  • It is a linear ordered structure
  • Occurred either directly or indirectly through
    environment interactions

12
Disadvantages
  • It is a slow process
  • It has very little control over the morphology
    of the top surface and the number of layers

13
Drawbacks
  • The control over morphology is very difficult
    to handle

14
Thank You.!!!!
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