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RISS 인기검색어
- 검색키워드
- 저자 : Juran Noh (검색결과 4 건)
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Noh, Juran,Jung, Sungwoo,Kim, Gyoungsik,Koo, Dong Geon,Choi, Kyoung Soon,Shin, Tae Joo,Yang, Changduk,Park, Juhyun Elsevier 2019 Journal of molecular liquids Vol.288 No.-
<P><B>Abstract</B></P> <P>Nanoassemblies of an organic semiconductor based on thienoisoindigo were prepared by forming nanomorphologies in phase-separated films of a thienoisoindigo-based molecule (TIIG-Bz), bromobenzaldehydes (BBAs), and a phospholipid, 1,2-dioctanoyl-<I>sn</I>-glycero-3-phosphocholine (D8PC), and then shattering the films via penetration of water into polar domains. It was suggested that 2-BBA associated with TIIG-Bz via intermolecular halogen and chalcogen bonding between the electron-deficient δ-holes of bromine in 2-BBA and sulfur in TIIG-Bz, and their electron-rich counterparts, carbonyl oxygen, in TIIG-Bz and 2-BBA, filling empty space in the conjugated planes. This resulted in the π-π stacking of conjugated planes overwhelming the lateral packing of alkyl chains as the ratios of 2-BBA and the lipid to TIIG-Bz increased and decreased, respectively, as proven by bathochromic shifts in the absorption spectra and grazing incidence X-ray diffraction patterns. It was concluded that, by varying the 2-BBA and D8PC compositions, the water-dispersed nanomorphologies of the organic semiconductor can be controlled via the competition of hydrophobic interactions between alkyl chains for lateral association for zero-dimensional growth and intermolecular π-π interactions for one-dimensional growth.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A thioisoindigo-based semiconductor (TIIG) was assembled with a phospholipid. </LI> <LI> 2-Bromobenzaldehyde was associated with TIIG via halogen and chalcogen bondings. </LI> <LI> Enlarged conjugated planes contributed to enhancement of intermolecular π-π interactions. </LI> <LI> 1D growth of TIIG resulted in flat, needle-like assemblies. </LI> </UL> </P>
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Noh, Juran,Kim, Jin,Kim, Jin Sic,Chung, Young Soo,Chang, Suk Tai,Park, Juhyun Elsevier 2018 Carbohydrate Polymers Vol.182 No.-
<P><B>Abstract</B></P> <P>Oil/water microencapsulation by microfluidic systems has been a prominent delivery method to prepare functional microcapsules in the food, cosmetic, and pharmaceutical industries because it is an easy way to control the shape and size of structures and functionalities. We prepared biocompatible and multi-component microcapsules using the precipitation and ionic crosslinking of pectin in a poor solubility environment and with multivalent cations, respectively. When the aqueous solution (including calcium ions and ethanol) in a sheath flow met the flow of a pectin aqueous solution containing oil droplets, ethanol-gelation and ionic cross-linking occurred, enclosing the inner oil phase droplets by solidified pectin shells. Furthermore, the resulting microcapsules stabilized by pectin shells exhibited functionalities using a hydrophobic agent and nanoparticles of a hydrophilic species that were dissolved and dispersed, respectively, in the oil phase.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Pectin microcapsules were fabricated using a microfluidic system. </LI> <LI> Pectin shells enclosing oil droplets were solidified by precipitation and ionic cross-linking. </LI> <LI> Nanoparticles of a hydrophilic agent were prepared and dispersed in inner oil droplets. </LI> <LI> A hydrophobic agent was dissolved in the oil droplets. </LI> <LI> Pectin microcapsules carried both hydrophilic and hydrophobic agents. </LI> </UL> </P>
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Pham, Thi-Thuy Duong,Seo, Young Hun,Lee, Dabin,Noh, Juran,Chae, Jeongwan,Kang, Eunah,Park, JaeHong,Shin, Tae Joo,Kim, Sehoon,Park, Juhyun Elsevier 2019 Polymer Vol.161 No.-
<P><B>Abstract</B></P> <P>We report that the ordered structure in the assemblies of iron oxide nanoparticles in conjugated polymer nanoparticles is the key to achieve better properties to realize multimodal theranostic agents for magnetic resonance and photoacoustic imaging. Hybrid nanoparticles of a conjugated polymer (PCPDTBT), a phospholipid (D8PE) with a primary amine polar head, and iron oxide (Fe<SUB>3</SUB>O<SUB>4</SUB>) nanoparticles were prepared by a phase-separated film shattering process by varying the iron oxide concentration while maintaining a fixed mixing ratio of PCPDTBT and D8PE. Notably, the hybrid nanoparticles assembled at a molar mixing ratio of 1:1:0.8 (PCPDTBT/D8PE/Fe<SUB>3</SUB>O<SUB>4</SUB>) exhibited the shortest transversal relaxation time, <I>T</I> <SUB>2</SUB>, and a photoacoustic signal 22 times higher than that obtained at the 1:1:0 mixing ratio. Structural analysis by X-ray diffraction together with the measurements of energy transfer by transient absorption spectroscopy confirmed that the structural ordering of these hybrid nanoparticles was responsible for their enhanced photoacoustic and magnetic properties.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Hybrid nanoparticles of a donor-acceptor-type conjugated polymer, iron oxides and a phospholipid. </LI> <LI> Shattering of phase-separated films produced hybrid nanoparticles. </LI> <LI> Strongly ordered assembly structures were confirmed by grazing incidence X-ray scattering. </LI> <LI> Contrast in both photoacoustic and magnetic resonance imaging were significantly enhanced. </LI> <LI> Ordering and clustering of conjugated polymers and magnetites were responsible for the property enhancement. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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