Huajie Liu

Preparation and characterization of core-shell oil absorption materials stabilized by modified fumed silica

Abstract The core-shell oil absorption material (OAM) with fumed silica shell was achieved from Pickering polymerization. The modified fumed silica wall could well stabilize both Pickering emulsion and Pickering polymerization. The particle size of encapsulated OAMs decreased with the increasing concentration of fumed silica and remained unchanged when the concentration was more than 1 wt.%. This fumed silica shell had little effect on the oil absorption rate of OAM. The importance was that the shell reversed the surface property and improved the alkali resistance of OAM. We believe that our core-shell OAMs could reach the self-healing ability of the oil well cement.

The application of natural sedimentation for the dispersion of polyacrylamide microspheres

ABSTRACT The research objectives of this article consist of development of appropriate apparatus and process to apply natural sedimentation for preparing polyacrylamide microspheres industrially. The kettle height of the apparatus should be more than 2 m to provide adequate sedimentation distance for microspheres, and the inner wall of kettle was made of non-polar materials to prevent microspheres from adhering to the wall. The natural sedimentation was used to replace dispersant to maintain the dispersion. Affordable, non-toxic, and non-pollutant corn oil was used as the dispersion medium. Furthermore, single factor synthesis and multi-factor analysis of variance were used to optimize the process. GRAPHICAL ABSTRACT