Self assembly

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nanotechnology, lithography, self assembly, gravitational field assisted assembly

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Self assembly

  1. 1. SELF-ASSEMBLED STRUCTURES GRAVITATIONAL FIELD ASSISTED ASSEMBLY
  2. 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. 3. In Other Words….…. Self-assembly components is of a a phenomenon system assemble where the themselves spontaneously via an interaction to form a larger functional unit.
  4. 4. 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
  5. 5. Parameters  Order  Interaction  Building Blocks  Rate of Sedimentation
  6. 6. Gravitational Field Assisted Assembly
  7. 7. • 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
  8. 8. To Improve Results  Field can accelerate ordering by improving the kinetics of assembly  Fields can potentially transition boundaries  Generating spatial gradient shift order-disorder
  9. 9. 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
  10. 10. Advantages  It is a linear ordered structure  Occurred either directly or indirectly through environment interactions
  11. 11. Disadvantages  It is a slow process  It has very little control over the morphology of the top surface and the number of layers
  12. 12. Drawbacks  The control over morphology is very difficult to handle
  13. 13. Thank You……….!!!!

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