By Youyong Xu, Felix Plamper, Matthias Ballauff (auth.), Axel H. E. Müller, Hans-Werner Schmidt (eds.)
-Polyelectrolyte Stars and Cylindrical Brushes via Y. Xu, F. Plamper, M. Ballauff, and A. H. E. Müller -Various points of the Interfacial Self-Assembly of Nanoparticles by way of N. Popp, S. Kutuzov, A. Böker -Holographic Gratings and information garage in Azobenzene-Containing Block Copolymers and Molecular Glasses via H. Audorff, okay. Kreger, R. Walker, D. Haarer, L. Kador, and H.-W. Schmidt -Donor–Acceptor Block Copolymers with Nanoscale Morphology for Photovoltaic purposes via M. Sommer, S. Huettner, and M. Thelakkat -Recent Advances within the development of Polymer Electret movies by way of D. P. Erhard, D. Lovera, C. von Salis-Soglio, R. Giesa, V. Altstädt, and H.-W. Schmidt
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Additional info for Complex Macromolecular Systems II
When the charge ratio Z−/+ was increased to unity, most of the brushes collapsed into globular structures. 75. AFM measurements reveal an intermediate helical state with a pitch of ca. 25 nm. The chains twist in order to relieve a part of the strain caused by the contraction along the long axis of the molecule. In some cases this leads to a helix with several turns. One explanation of the helix formation is given on the basis of entropic arguments . The helical structures can increase the overlapping volume of the brushes, and thus increase the entropy of the whole system.
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 41 43 44 48 50 54 54 Abbreviations DFT FLIP FRAP GISAXS LbL O PS PS-b-P2VP RhB SCFT SFM TEM TOPO W Density functional theory Fluorescence loss induced by photobleaching Fluorescence recovery after photobleaching Grazing-incidence small-angle X-ray scattering Layer-by-layer Oil Polystyrene Polystyrene-block-poly(2-vinyl-piridine) Rhodamine B Self-consistent field theory Scanning force microscopy Transmission electron microscopy Tri-n-octylphosphine oxide Water 1 Introduction This chapter is concerned with the increasing use of liquid interfaces as templates for the self-assembly of colloidal particles .
By using a complex trivalent counterion which can undergo a photoaquation reaction, “nanoblossoms” can be built under the UV radiation. The temperature responsiveness of the weak polyelectrolyte PDMAEMA stars was also investigated. Their normal LCST behavior strongly depends on pH. Adding trivalent counterions can even induce a UCST behavior. The stars can also form IPECs with oppositely charged polyelectrolytes. Polyelectrolyte cylindrical brushes behave in similar ways as the polyelectrolyte stars in many aspects.