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Li, Haiqing,Bahuleyan, Bijal K.,Johnson, Renjith P.,Shchipunov, Yury A.,Suh, Hongsuk,Ha, Chang-Sik,Kim, Il Royal Society of Chemistry 2011 Journal of materials chemistry Vol.21 No.44
<P>An α-diimine compound (DC) bearing multiple hydroxyl and amine groups presents excellent self-assembly behavior, yielding DC self-assemblies with tunable morphologies ranging from solid spheres, nanotubes and capsules <I>via</I> hydrogen bonds and π–π stacking interactions. These DC self-assemblies provide promising multifunctional hosts for varied metal species. As a typical example, Au nanoparticles are <I>in situ</I> generated and accommodated into both solid and hollow DC self-assemblies by one-pot and two-step fabrication processes, respectively, resulting in the formation of solid and hollow DC/Au hybrid nanostructures. Both solid and hollow DC self-assemblies also enable host Ni(<SMALL>II</SMALL>) ions to generate DC/Ni(<SMALL>II</SMALL>) catalysts for the efficient production of porous polyethylene (PE) beads consisting of numerous PE microspheres. Moreover, the yielded PE beads replicate the textural morphologies of the original DC/Ni(<SMALL>II</SMALL>) catalysts. These DC self-assemblies also might be further utilized to host varied metal species to fabricate versatile DC/metal nanoparticle (Ag, Pt, Pd, <I>etc.</I>) hybrids and porous polyolefin beads with desired morphologies.</P> <P>Graphic Abstract</P><P>Supramolecular self-assemblies of a α-diimine complex are presented together with their applications as multifunctional host systems. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1jm13081a'> </P>
Chao-Jen Wang,Wei-Fan Kuan,Hui-Ping Lin,Yury A. Shchipunov,Li-Jen Chen 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.96 No.-
In this study, an eco-friendly fabrication process for the hydrophilic polydimethylsiloxane (PDMS)-basedsponge was proposed with the assistance of sugar templates and poly(dimethylsiloxane-b-ethyleneoxide) (PDMS-b-PEO) block copolymer additives. The effects of sugar loadings and sugar particle sizes onsponge structure and separation performance were investigated. Manipulating sugar loadings exhibiteda unique control over the porosity of sponge, which further influenced the absorption capacity and oil–water separation speed. Additionally, the surface modification of PDMS sponge from hydrophobic/oleophilic to hydrophilic/underwater oleophobic was achieved by incorporating PDMS-b-PEO. Suchmodified sponge demonstrated an underwater oil contact angle of 154 and a stable separation efficiencygreater than 99.9% in the gravity-driven cycledfiltration tests. The hydrophilic PDMS-b-PEO modifiedsponges highlighted herein reveal a promising potential for novel separation materials with energyefficientand cost-effective features, which are ideal for oil spill clean-up events and wastewatertreatment application.
Shin, Nam Ho,Lee, Jin Kyu,Li, Haiqing,Ha, Chang-Sik,Shchipunov, Yury A,Kim, Il American Scientific Publishers 2010 Journal of Nanoscience and Nanotechnology Vol.10 No.10
<P>Poly[(methyl methacrylate)-block-poly(L-histidine)] (PMMA-b-PHIS) was synthesized by combining atom transfer radical polymerization and living ring-opening polymerization of alpha-amino acid-N-carboxyanhydride. The resulting hybrid block copolymer forms reverse micelles in the mixture solution of water and N,N-dimethylformamide (DMF) and self-assembles into PHIS/PMMA core/shell spheres with controllable size in the range of 80 to 250 nm depending on the micellization temperature. The self-assembly of PMMA-b-PHIS was carried out in H2O/DMF (3/7) mixture in the presence of AgNO3. Reduction of the resulting Ag ions encapsulated inside of the reverse micelles yielded an attractive Ag nanoparticle core/polymer shell conjugate system.</P>