高分子添加劑對耐米粒子懸浮液相行為影響之研究
Other Title
The effect of polymeric additives on the phase behavior of the
nanosized particle suspension
nanosized particle suspension
Date Issued
1999
Date
1999
Author(s)
DOI
882218E002046
Abstract
The addition of polymers to a col-loidal
dispersion creates a change in the
phase behavior and the local structure of
the colloidal component. This effect is of
great importance in dealing with treatment
of colloidal suspensions. For example, it
has been known that upon adding enough
nonadsorbing polymer to the system, the
colloidal particles tend to cluster. The
presence of the polymers induces an en-tropic-
originated attraction between the
colloidal particles. On the other hand, the
entropic effect can also cause steric hin-drance
to prevent coagulation of the colloi-dal
particles if the appropriate dopant, such
as diblock copolymer, is added.
To achieve the purpose of steric
stabilization of a suspension, for a diblock
copolymer, block A should have a prefer-ential
affinity for the colloidal particle and
block B for the continuum fluid. With
block A adsorbed on the particle surface
and block B extending out to the continu-ous
phase, these diblock copolymers form
protective layers to prevent colloidal parti-cles
to come in contact with each other.
As a consequence, the suspension is more
stabilized.
We intend to perform Monte Carlo simulation to investigate this phenomenon
on the microscopic level. The system is
studied in continuous space with the parti-cle
interacting through the square-well po-tential.
Important factors such the ratio of
chain bead diameter to colloidal particle
diameter, the chain lengths of block A and
B, and the concentration of the added di-block
copolymers will be carefully exam-ined
and the effect of each factor on the
thermodynamic properties such as the ra-dial
distribution function, of the system
will be determined.
Subjects
Nanosized particles
Diblock copolymer
Radial distribution func-tion
Computer molecular simulations
Publisher
臺北市：國立臺灣大學化學工程學系暨研究所
Type
report
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