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From Heterocoagulated Colloids to Core–Shell Particles

✍ Scribed by Hong Li; Jeannie Han; Alexei Panioukhine; Eugenia Kumacheva

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
301 KB
Volume
255
Category
Article
ISSN
0021-9797

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✦ Synopsis

Heterocoagulation of large and small oppositely charged colloid particles, accompanied by spreading of small beads over the surface of large spheres, offers a promising alternative to synthesis of core-shell particles via interfacial polymerization. In this paper, conditions required for complete spreading of the shell-forming polymer over the surface of the core-forming material (CFM) are predicted in terms of a critical distance, x(cr), between the small particles on the surface of the CFM. The theoretical value of x(cr) is tested in experiments conducted for polypyrrole/polyacrylic and silica-titanyl sulfate/polyacrylic heterocoagulate units.

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