Self-assembly is a process where components of a system spontaneously assemble via interactions to form organized structures, without external direction. Gravitational field assisted assembly uses sedimentation in a gravitational field to produce ordered aggregates of molecules and colloidal particles through a bottom-up approach. The sedimentation process must be slow enough for particles to concentrate at the bottom of the container and undergo a disorder-to-order transition to form a 3D structure. While this method allows for linear ordered structures, it is a slow process with little control over surface morphology or number of layers formed.

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
components
is
of
a
a
phenomenon
system
assemble
where
the
themselves
spontaneously via an interaction to form a larger
functional unit.

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

8. • 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
transition boundaries
 Generating spatial gradient
shift
order-disorder

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……….!!!!