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Size control and registration of nano-structured thin films by cross-linkable units
Kim, Eunhye,Shin, Changhak,Ahn, Hyungju,Ryu, Du Yeol,Bang, Joona,Hawker, Craig J.,Russell, Thomas P. Royal Society of Chemistry 2008 Soft matter Vol.4 No.3
<P>Thermoset thin films <I>via</I> directed self-assembly, where benzocyclobutene (BCB) groups are incorporated selectively into the one block, have been prepared from cross-linkable block copolymers in a simple process, which allows size controllability and the registration of oriented microdomains in multi-layer applications.</P> <P>Graphic Abstract</P><P>Thermoset thin films <I>via</I> directed self-assembly, prepared from cross-linkable block copolymers, allow size controllability and the registration of oriented microdomains in multi-layer applications. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b717903k'> </P>
Cha, Min-Ah,Shin, Changhak,Kannaiyan, Dinakaran,Jang, Yoon Hee,Kochuveedu, Saji Thomas,Ryu, Du Yeol,Kim, Dong Ha Royal Society of Chemistry 2009 Journal of materials chemistry Vol.19 No.39
<P>Hybrid titanium dioxide (TiO<SUB>2</SUB>) nanostructures with engineered morphologies were produced by a simple synthetic approach based on cooperative sol-gel chemistry and self-assembly of amphiphilic poly(styrene-<I>block</I>-ethylene oxide) (PS-<I>b</I>-PEO) block copolymer (BCP) <I>via</I> spin-coating common solutions of BCP and inorganic precursors. TiO<SUB>2</SUB> nanostructures with two extreme reverse morphologies, <I>i.e.</I>, TiO<SUB>2</SUB> dot-in-PS matrix and PS dot-in-TiO<SUB>2</SUB> matrix, were obtained by increasing the volumetric ratio of the TiO<SUB>2</SUB> sol-gel precursor from 10 to 50 vol%. Incorporation of silver nitrate into the TiO<SUB>2</SUB> matrix afforded a hybrid Ag/TiO<SUB>2</SUB> thin film with hexagonally packed arrays of PS nanodots. Upon removal of the PS-<I>b</I>-PEO template from the initial hybrid films by UV treatment, inorganic nanostructures having the same lateral morphologies as the initial films were derived. Among the structures investigated, the Ag/TiO<SUB>2</SUB> mesoporous film exhibited the best photocatalytic performance. The surface/internal morphology and the mechanism of structural evolution were investigated by atomic force microscopy (AFM), transmission electron microscopy (TEM), and grazing-incidence small-angle X-ray scattering (GISAXS).</P> <P>Graphic Abstract</P><P>TiO<SUB>2</SUB> and Ag/TiO<SUB>2</SUB> nanostructures with engineered morphologies and enhanced photocatalytic properties were produced by a cooperative sol-gel chemistry and block copolymer self-assembly. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b907922j'> </P>
Lee, Sang Jin,Won, Jong-Eun,Han, Changhak,Yin, Xiang Yun,Kim, Hyung Keun,Nah, Haram,Kwon, Il Keun,Min, Byoung-Hyun,Kim, Chul-Ho,Shin, Yoo Seob,Park, Su A Elsevier 2019 JOURNAL OF COLLOID AND INTERFACE SCIENCE - Vol.539 No.-
<P><B>Abstract</B></P> <P>Defects in bone are some of the most difficult injuries to treat. Biomimetic scaffolds represent a promising approach for successful bone tissue regeneration. In this study, a three-dimensional (3D) scaffold with osteo-inductive functionality was designed and assayed both in-vitro and in-vivo. Bone formation peptide-1 (BFP1), an osteo-promoting specific peptide, was covalently bound to a 3D printed polycaprolactone (PCL) scaffold using polydopamine (DOPA). The amount of BFP1 immobilized on the surface was found to increase depending on the BFP1 concentration of the loading solution. To observe the biological effects of the 3D scaffolds, human tonsil-derived mesenchymal stem cells (hTMSCs) were isolated. The cells were cultured on the scaffolds and observed to rapidly differentiate into osteoblast-like cells with osteo-promoting capabilities. The scaffolds were implanted in a rabbit calvarial defect model for 8 weeks and successfully stimulated both vessel and bone regeneration. Osteo-promoting 3D scaffolds may provide a safer and more efficient approach for bone repair and remodelling in regenerative medicine.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>