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Ryu, Ja-Hyoung,Kim, Ho-Joong,Huang, Zhegang,Lee, Eunji,Lee, Myongsoo WILEY-VCH Verlag 2006 Angewandte Chemie. international edition Vol.45 No.32
<B>Graphic Abstract</B> <P>Dumbbells that are not dumb: Dumbbell-shaped molecules based on a hexa-p-phenylene derivative self-assemble into well-defined left-handed helical fibers in aqueous solution. These helical nanofibers convert reversibly into hollow nanocapsules by intercalation of aromatic guest molecules (red spheres). <img src='wiley_img/14337851-2006-45-32-ANIE200600971-content.gif' alt='wiley_img/14337851-2006-45-32-ANIE200600971-content'> </P>
Highly Ordered Gold Nanotubes Using Thiols at a Cleavable Block Copolymer Interface
Ryu, Ja-Hyoung,Park, Soojin,Kim, Bokyung,Klaikherd, Akamol,Russell, Thomas P.,Thayumanavan, S. American Chemical Society 2009 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.131 No.29
<P>We have prepared functionalized nanoporous thin films from a polystyrene-block-polyethylene oxide block copolymer, which was made cleavable due to the intervening disulfide bond. The cleavage reaction of the disulfide bond leaves behind free thiol groups inside the nanopores of polystyrene thin film. This nanoporous thin film can be used as a template for generating gold nanoring structures. This strategy can provide a facile method to form a highly ordered array of biopolymer or metal-polymer composite structures.</P>
Intracellular Polymerization and Self-Assembly for Supramolecular Approach to Control Cellular Fate
Ja-Hyoung Ryu(유자형) 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
The polymerization-induced artificial assembly of synthetic building units inside a living cell and the interaction of these assembly with the cellular components have rarely been studied, but are emerging as an intriguing strategy to control cellular fate. We developed intra-mitochondrial polymerization induced self-assembly (Mito-PISA) strategy for constructing polymeric structures by ROS-dissipative system. We report that the in situ disulfide polymerization inside mitochondria is based on both large accumulation of monomers (increased local concentration for polymerization) and high ROS environment (chemical fuel for disulfide reaction). During the polymerization in a mitochondrial reducing environment, the autocatalytic process enables the continuous generation of ROS and the construction of bulky structures for mitochondrial dysfunction, showing great potential for anticancer treatment.
Supramolecular Helical Columns from the Self-Assembly of Chiral Rods
Ryu, Ja-Hyoung,Tang, Lijun,Lee, Eunji,Kim, Ho-Joong,Lee, Myongsoo WILEY-VCH Verlag 2008 Chemistry Vol.14 No.3
<P>Chiral-bridged rod molecules (CBRs) that consisted of bis(penta-p-phenylene) conjugated to an opened or closed chiral bridging group as a rigid segment and oligoether dendrons as flexible segments were synthesized and characterized. In the bulk state, both molecules self-assemble into a hexagonal columnar structure, as confirmed by X-ray scatterings and transmission electron microscopy (TEM) observations. Interestingly, these structures display opposite Cotton effects in the chromophore of the aromatic unit in spite of the same chirality (R,R) of the chiral bridging groups. The molecules were observed to self-assemble into cylindrical micellar aggregates in aqueous solution, as confirmed by light scattering and TEM investigations, and exhibit intense signals in the circular dichroism (CD) spectra, which are indicative of one-handed helical conformations. The CD spectra of each molecule showed opposite signals to each other, which were similar to those in the bulk. Notably, when the opened CBR was added to a solution of closed CBRs up to a certain concentration, the CD signal of the closed CBR was amplified. This implies that both molecules co-assemble into a one-handed helical structure because the opened chiral bridge is conformationally flexible, which is inverted to co-assemble with the closed CBR. These results demonstrate that small structural modifications of the chiral moiety can transfer the chiral information to a supramolecular assembly in the opposite way.</P> <B>Graphic Abstract</B> <P>Chiral template: When an opened chiral-bridged rod molecule was added to a solution of closed chiral-bridged rod molecules, both molecules co-assemble into a one-handed helical structure owing to conformational flexibility of the opened chiral-bridged rod molecule (see picture). <img src='wiley_img/09476539-2008-14-3-CHEM200701080-content.gif' alt='wiley_img/09476539-2008-14-3-CHEM200701080-content'> </P>
Effect of Hofmeister Ions on the Size and Encapsulation Stability of Polymer Nanogels
Li, Longyu,Ryu, Ja-Hyoung,Thayumanavan, S. American Chemical Society 2013 Langmuir Vol.29 No.1
<P>Influence of Hofmeister ions has been investigated on the size and guest encapsulation stability of a polymeric nanogel. While variations in macroscopic phase transitions have been observed in response to the presence of salts, changes in the size and host–guest behavior of polymeric aggregates in the presence of salts have not been explored in any detail. We find that the size and core density of nanogel, which was prepared by self-crosslinking from a random copolymer that contains oligo(ethylene glycol) (OEG) and pyridyl disulfide (PDS) units as side-chain functionalities, can be fine-tuned through the addition of both chaotropes and kosmotropes during nanogel formation. We also demonstrate that the change in core density affects the guest encapsulation stability and stimuli-responsive character of the nanogel.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/langd5/2013/langd5.2013.29.issue-1/la3033463/production/images/medium/la-2012-033463_0009.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/la3033463'>ACS Electronic Supporting Info</A></P>