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Chung, Hyun Jung,Lee, Haeshin,Bae, Ki Hyun,Lee, Yuhan,Park, Jongnam,Cho, Seung-Woo,Hwang, Jin Young,Park, Hyunwook,Langer, Robert,Anderson, Daniel,Park, Tae Gwan American Chemical Society 2011 ACS NANO Vol.5 No.6
<P>Currently available methods to stably disperse iron oxide nanoparticles (IONPs) in aqueous solution need to be improved due to potential aggregation, reduction of superparamagnetism, and the use of toxic reagents. Herein, we present a facile strategy for aqueous transfer and dispersion of organic-synthesized IONPs using only polyethylene glycol (PEG), a biocompatible polymer. A library of PEG derivatives was screened, and it was determined that amine-functionalized six-armed PEG, 6(PEG-NH<SUB>2</SUB>), was the most effective dispersion agent. The 6(PEG-NH<SUB>2</SUB>)-modified IONPs (IONP-6PEG) were stable after extensive washing, exhibited high superparamagnetism, and could be used as a platform material for secondary surface functionalization with bioactive polymers. IONP-6PEG biofunctionalized with hyaluronic acid (IONP-6PEG-HA) was shown to specifically label mesenchymal stem cells and demonstrate MR contrast potential with high <I>r</I><SUB>2</SUB> relaxivity (442.7 s<SUP>–1</SUP>mM<SUP>–1</SUP>) compared to the commercially available Feridex (182.1 s<SUP>–1</SUP>mM<SUP>–1</SUP>).</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2011/ancac3.2011.5.issue-6/nn201198f/production/images/medium/nn-2011-01198f_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn201198f'>ACS Electronic Supporting Info</A></P>
Ryu, Seongwoo,Lee, Yuhan,Hwang, Jae‐,Won,Hong, Seonki,Kim, Chunsoo,Park, Tae Gwan,Lee, Haeshin,Hong, Soon Hyung WILEY‐VCH Verlag 2011 Advanced Materials Vol.23 No.17
<P>Super‐strong carbon nanotube fibers can be fabricated by infiltration of poly(ethylenimine)‐catechols (PEI‐Cs), report Tae Gwan Park, Haeshin Lee, Soon Hyung Hong, and co‐workers on p. 1971. PEI‐C mimics the amino acid sequence of mussel adhesive proteins in which catechols from 3,4‐dihydroxyl‐l‐phenylalanine and amines from lysine are found. Weak interactions between CNTs are overcome by heat‐induced, metal‐catalyzed chemical crosslinking of catechol, resulting in high‐strength CNT fibers. </P>
One‐Step Multipurpose Surface Functionalization by Adhesive Catecholamine
Kang, Sung Min,Hwang, Nathaniel S.,Yeom, Jihyeon,Park, Sung Young,Messersmith, Phillip B.,Choi, Insung S.,Langer, Robert,Anderson, Daniel G.,Lee, Haeshin WILEY‐VCH Verlag 2012 Advanced functional materials Vol.22 No.14
<P><B>Abstract</B></P><P>Surface modification is one of the most important techniques in modern science and engineering. The facile introduction of a wide variety of desired properties onto virtually any material surface is an ultimate goal in surface chemistry. To achieve this goal, the incorporation of structurally diverse molecules onto any material surface is an essential capability for ideal surface modification. Here, a general strategy for surface modification is presented in which many diverse surfaces can be functionalized by immobilizing a wide variety of molecules. This strategy functionalizes surfaces by a one‐step immersion of substrates in a one‐pot mixture of a molecule and a catecholamine surface modification agent. This one‐step procedure for surface modification represents a standard protocol to control interfacial properties.</P>