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

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.

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 Creators:
Taubert, A.1, Author              
Glasser, G.1, Author              
Palms, D.1, Author              
Affiliations:
1MPI for Polymer Research, Max Planck Society, ou_1309545              

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 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.

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Language(s): eng - English
 Dates: 2002-05-28
 Publication Status: Published in print
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 Table of Contents: -
 Rev. Type: No review
 Identifiers: eDoc: 28485
ISI: 000175801600048
Other: P-02-158
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Title: Langmuir
  Alternative Title : Langmuir
Source Genre: Journal
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Pages: - Volume / Issue: 18 (11) Sequence Number: - Start / End Page: 4488 - 4494 Identifier: ISSN: 0743-7463