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Facile Routes to Patterned Surface Neutralization Layers for Block Copolymer Lithography
Bang, J.,Bae, J.,Lö,wenhielm, P.,Spiessberger, C.,Given-Beck, S. A.,Russell, T. P.,Hawker, C. J. WILEY-VCH Verlag 2007 Advanced Materials Vol.19 No.24
<B>Graphic Abstract</B> <P>A new crosslinking system based on azide-functionalized random copolymers has been defined for the preparation of substrates with controllable surface interactions. The azido group is used for both thermal- and photo-crosslinking, which is found to be very efficient. Furthermore, the use of UV irradiation for crosslinking enables the preparation of patterned surfaces by conventional photolithographic techniques, combining the “bottom-up” self-assembly of block copolymer strategies with traditional “top-down” photolithographic methods. <img src='wiley_img/09359648-2007-19-24-ADMA200701866-content.gif' alt='wiley_img/09359648-2007-19-24-ADMA200701866-content'> </P>
Thin Films of Block Copolymers as Planar Optical Waveguides
Kim, D. H.,Lau, K. H. A.,Robertson, J. W. F.,Lee, O.-J.,Jeong, U.,Lee, J. I.,Hawker, C. J.,Russell, T. P.,Kim, J. K.,Knoll, W. WILEY-VCH Verlag 2005 Advanced Materials Vol.17 No.20
<B>Graphic Abstract</B> <P>Thin films of diblock copolymers with cylindrical microdomains oriented normal to the film plane are employed as planar optical waveguides in the Kretschmann configuration (see Figure). Their waveguiding properties were investigated by optical waveguide spectroscopy. The dielectric constants and the film thickness of the block copolymer layer can be independently obtained from fitting between the waveguide patterns for s- and p-polarization and Fresnel calculations. <img src='wiley_img/09359648-2005-17-20-ADMA200500170-content.gif' alt='wiley_img/09359648-2005-17-20-ADMA200500170-content'> </P>
Ku, Kang Hee,Shin, Jae Man,Klinger, Daniel,Jang, Se Gyu,Hayward, Ryan C.,Hawker, Craig J.,Kim, Bumjoon J. American Chemical Society 2016 ACS NANO Vol.10 No.5
<P>A series of porous block copolymer (BCP) particles with controllable morphology and pore sizes was fabricated by tuning the interfacial behavior of BCP droplets in oil-in-water emulsions. A synergistic adsorption of polystyrene-b-poly(4-vinylpyridine) (PS-b-P4VP) BCPs and sodium dodecyl sulfate (SDS) to the surface of the emulsion droplet induced a dramatic decrease in the interfacial tension and generated interfacial instability at the particle surface. In particular, the SDS concentration and the P4VP volume fraction of PS-b-P4VP were key parameters in determining the degree of interfacial instability, leading to different types of particles including micelles, capsules, closed-porosity particles, and open-porosity particles with tunable pore sizes ranging from 10 to 500 nm. The particles with open-porosity could be used as pH responsive, high capacity delivery systems where the uptake and release of multiple dyes could be achieved.</P>