Wetting Transitions Within Soft Restricted Compartments

Nowadays,the nature of hard matter has been understood to a great extent.However,soft matter is also widespread in nature and daily life,affecting people’s daily life.As a very important and special interface in soft matter physics,soft interface,especially the formation of closed soft restricted compartments,has attracted a large number of scientists’ interest.In this thesis,the computational model which combines Helfrich elastic theory for the fluid membrane and the self-consistent field theory(SCFT)for polymers is extended to study the morphological change of a soft restricted compartment encapsulating two aqueous phase systems.Taking the permeability of polymer to membrane,the interaction between polymers and polymers,polymers and membrane into account,the new shape equation of the membrane is re-derived.The numerical solution of the composite model is used to study the wettability of soft restricted compartments.(1)A quasi-spherical membrane bubble with zero spontaneous curvature is selected.We focused on the effect of the penetration,the composition of polymer,the interaction between polymers and polymers,polymers and membrane on the phase morphology and of wettability of polymer and membrane.The results show that,in addition to the proportion of polymer composition,the changes in the properties of the other properties are all the changes in the distribution of the polymer and the intrinsic contact angle,even lead to wetting transitions.However,the change of polymer composition in the deep quench regime does not affect the value of intrinsic contact angle.In addition,it can be found that the intrinsic contact angle of the composite system is independent of the reduced volume.(2)Prolate,pear and discocyte membrane vesicles with same reduced volume from four different spontaneous curvature are selected.The effect of the penetration,the composition of polymer,the interaction between polymers and membrane on the phase morphology and of wettability of polymer and membrane were further investigated.The results show that all changes in parameters can lead to wetting transition in different shapes,but the order of wetting transformation is different.However,the shapes have no effect on the value of intrinsic contact angle before wetting transition.In addition,when the change of polymer composition or the interaction between polymers change the system to shallow quench regime,there may also be wetting transitions.Also,the intrinsic contact angle is independent of the reduced volume and the spontaneous curvature.The theoretical simulation results in this paper will help to understand the wetting transition mechanism of closed soft.restricted compartments composed of amphiphilic molecules.It can provide theoretical guidance for the wetting transitions in cells,vesicles and micelles with different shapes.Therefore,it has important theoretical significance.