NDLI: Polymer-assisted formation of hydrophobized, shape-anisotropic zinc oxide nanoparticles via an inverse emulsion technique

Content Provider	Springer Nature Link
Author	Geidel, Christian Schmidtke, Kathy Klapper, Markus Müllen, Klaus
Copyright Year	2011
Abstract	A one-step inverse emulsion process using amphiphilic surface-active copolymers for the synthesis of hydrophobized, shape-anisotropic inorganic nanoparticles is presented. While such structures are normally prepared sequentially by particle formation and hydrophobization, we have combined both reactions. This approach is demonstrated exemplarily with zinc oxide (ZnO) nanoparticles. A key issue is the design of amphiphilic copolymers that act as emulsifiers to enable an aggregate-free redispersion of the particles and to stabilize the inverse emulsion for the precipitation in the droplets. In a first approach, the stabilizing as well as the hydrophobizing property of the copolymers are combined with the ability to control the crystallization in one polymer (structure-directing emulsifier—SDE). In a second approach, a mixture of two polymers is applied: an amphiphilic copolymer for hydrophobizing/stabilizing the inorganic nanoparticles and a polar or double hydrophilic polymer that induces the anisotropic growth of the ZnO nanocrystals (structure-directing agents—SDA). Homopolymers and block copolymers, consisting of phosphonic acid groups or propylene oxide groups, were used as SDAs. Typically, hydrophobized shape-anisotropic particles of up to 600 nm in length and with an aspect ratio of 1:4 were obtained.
Starting Page	1443
Ending Page	1454
Page Count	12
File Format	PDF
ISSN	01700839
Journal	Polymer Bulletin
Volume Number	67
Issue Number	8
e-ISSN	14362449
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-02-23
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Zinc oxide Anisotropic shape Nanoparticle Inverse emulsion In situ hydrophobization Characterization and Evaluation of Materials Physical Chemistry Polymer Sciences Soft and Granular Matter, Complex Fluids and Microfluidics
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry Condensed Matter Physics Polymers and Plastics

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