Won Ju Phang
Korea University
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Publication
Featured researches published by Won Ju Phang.
Angewandte Chemie | 2015
Won Ju Phang; Hyuna Jo; Woo Ram Lee; Jeong Hwa Song; Kicheon Yoo; BongSoo Kim; Chang Seop Hong
Facile postsynthetic oxidation of the thiol-laced UiO-66-type framework UiO-66(SH)2 enabled the generation of UiO-66(SO3 H)2 with sulfonic acid groups covalently linked to the backbone of the system. The oxidized material exhibited a superprotonic conductivity of 8.4×10(-2) S cm(-1) at 80 °C and 90 % relative humidity, and long-term stability of the conductivity was observed. This level of conductivity exceeds that of any proton-conducting MOF reported to date and is equivalent to the conductivity of the most effective known electrolyte, Nafion.
Angewandte Chemie | 2014
Won Ju Phang; Woo Ram Lee; Kicheon Yoo; Dae Won Ryu; BongSoo Kim; Chang Seop Hong
A porous metal-organic framework (MOF), [Ni2(dobdc)(H2O)2]⋅6 H2O (Ni2(dobdc) or Ni-MOF-74; dobdc(4-)=2,5-dioxido-1,4-benzenedicarboxylate) with hexagonal channels was synthesized using a microwave-assisted solvothermal reaction. Soaking Ni2(dobdc) in sulfuric acid solutions at different pH values afforded new proton-conducting frameworks, H(+)@Ni2(dobdc). At pH 1.8, the acidified MOF shows proton conductivity of 2.2×10(-2) S cm(-1) at 80 °C and 95% relative humidity (RH), approaching the highest values reported for MOFs. Proton conduction occurs via the Grotthuss mechanism with a significantly low activation energy as compared to other proton-conducting MOFs. Protonated water clusters within the pores of H(+)@Ni2(dobdc) play an important role in the conduction process.
Chemical Communications | 2013
Euna Jeong; Woo Ram Lee; Dae Won Ryu; Yeonga Kim; Won Ju Phang; Eui Kwan Koh; Chang Seop Hong
An aqua-bridged Mn metal-organic framework was prepared, and a dramatic structural transformation occurs upon solvent exchange-resolvation and desolvation-resolvation processes. The desolvated phase, formed by removing the aqua bridges, exhibits selective CO(2) uptake over N(2), H(2), and CH(4). Further, antiferromagnetic couplings are also found between Mn spins in the secondary building units.
Chemical Communications | 2012
Woo Ram Lee; Dae Won Ryu; Won Ju Phang; Ji Hye Park; Chang Seop Hong
A paddle-wheel-type Cu metal-organic framework CuHTPO involving hydrogen bonds in the network is utilized to obtain composite systems with different metal ions of Zn(2+) and Tb(3+). The framework stability and crystal transformation are affected by the charges of foreign cations.
Dalton Transactions | 2013
Won Ju Phang; Woo Ram Lee; Kicheon Yoo; BongSoo Kim; Chang Seop Hong
A two-dimensional (2D) Zn(II) metal-organic framework with flexible aryl ether linkers and water molecules exposed to the pores was prepared. The supramolecular three-dimensional (3D) network is generated by the presence of extensive π-π contacts, which could be responsible for gas uptake. The water molecules and oxygen atoms from the flexible linkers create a polar environment within the integrated framework, leading to simultaneous selective CO2 adsorption and proton conductivity in the two-dimensional Zn(II) framework.
Dalton Transactions | 2014
Dae Won Ryu; Jin Ho Shin; Kwang Soo Lim; Woo Ram Lee; Won Ju Phang; Sung Won Yoon; Byoung Jin Suh; Eui Kwan Koh; Chang Seop Hong
Dehydration of the three-dimensional Cu(II)-Mn(III) coordination network undergoes a dramatic magnetic phase transformation from a paramagnetic state to a long-range magnetic ordered phase with glassy behavior. The gas adsorption behavior and re-entrant spin glass character are uniquely apparent in the dehydrated sample.
Crystal Growth & Design | 2014
Yeonga Kim; Jeong Hwa Song; Woo Ram Lee; Won Ju Phang; Kwang Soo Lim; Chang Seop Hong
Crystal Growth & Design | 2014
Ji Hye Park; Woo Ram Lee; Yeonga Kim; Hye Jin Lee; Dae Won Ryu; Won Ju Phang; Chang Seop Hong
Crystal Growth & Design | 2014
Dae Won Ryu; Woo Ram Lee; Kwang Soo Lim; Won Ju Phang; Chang Seop Hong
Crystal Growth & Design | 2012
Ji Hye Park; Woo Ram Lee; Dae Won Ryu; Kwang Soo Lim; Eun A Jeong; Won Ju Phang; Eui Kwan Koh; Chang Seop Hong