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Kinetics and particle formation mechanism of zinc oxide particles in polymer-controlled precipitation from aqueous solution

MPS-Authors
http://pubman.mpdl.mpg.de/cone/persons/resource/persons48846

Taubert,  A.
MPI for Polymer Research, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons47939

Glasser,  G.
MPI for Polymer Research, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons48544

Palms,  D.
MPI for Polymer Research, Max Planck Society;

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Citation

Taubert, A., Glasser, G., & Palms, D. (2002). Kinetics and particle formation mechanism of zinc oxide particles in polymer-controlled precipitation from aqueous solution. Langmuir, 18(11), 4488-4494.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000F-65EC-E
Abstract
The morphogenesis, particle size, size distribution, and phase evolution of zinc oxide precipitated in the presence of water- soluble poly(ethylene oxide-block-methacrylic acid) (P(EO-b- MAA)) and poly(ethylene oxide-block-styrene sulfonic acid) (P(EO-b-SSH)) diblock copolymers is reported. Without a polymeric additive, spindlelike particles with a central grain boundary form along with multiply twinned particles. After similar to30 min, the multiple twins are gone, small, needlelike crystals appear, and the sample becomes more polydisperse. With P(EO-b-MAA) copolymers, initially more rounded particles with the same central grain boundary and a narrow size distribution form. They preferentially grow along the crystallographic c-axis and eventually adopt a hexagonal prismatic shape. With P(EO-b-SSH) copolymers, a lamellar intermediate precipitates first. It eventually dissolves and hexagonal prismatic crystals form; in a subsequent growth process unique to these polymeric additives, the crystals grow along the crystallographic a-axis and transform to another morphology termed the "stack of pancakes" shape. Both in the absence of polymer and with P(EO-b-MAA) copolymers, multiple particle generations precipitate. With P(EO-b-SSH) copolymers, no second generation is observed. Nucleation is delayed by the P(EO-b-MAA) copolymers, while P(EOb-SSH) copolymers favor the rapid nucleation of the highly ordered lamellar intermediate.