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Total Citation: 15255; h-index: 42

Nature Poster

NatureMater_Cover

JMC Cover

CC backCover

    [2017]

    • [123]

      Jongsik Park†, Young Jin Sa†, Hionsuck Baik, Taehyun Kwon, Sang Hoon Joo*, and Kwangyeol Lee*

      Iridium-Based Multimetallic Nanoframe@Nanoframe Structure: An Efficient and Robust Electrocatalyst toward Oxygen Evolution Reaction
    • ACS Nano
    • Published on the Web (2017). PDF Link
    • 122. ACSN
    • [122]

      Yeonjun Shim, Young Jin Sa, Yunseok Shin, Junghoon Oh, Hyunchul Ju, Sang Hoon Joo, and Sungjin Park*

      Electrocatalysts Composed of Co(acetylacetonate)2 Molecule and Refluxed Graphene Oxide for Oxygen Reduction Reaction
    • New J. Chem.
    • Accepted for Publication (2017).
    • [121]

      Young Jin Sa, Jae Hyung Kim, and Sang Hoon Joo*

      Recent Progress in the Identification of Active Sites in Pyrolyzed Fe‒N/C Catalysts and Insights into Their Role in Oxygen Reduction Reaction
    • J. Electrochem. Sci. Technol.
    • Accepted for Publication (2017).
    • [120]

      Donghwan Yoon†, Jaeyoung Lee†, Bora Seo†, Byeongyoon Kim, Hionsuck Baik, Sang Hoon Joo*, and Kwangyeol Lee*

      Cactus-Like Hollow Cu2-xS@Ru Nanoplates as Excellent and Robust Electrocatalysts for the Alkaline Hydrogen Evolution Reaction
    • Small
    • Published on the Web (2017). PDF Link
    • 119. Small
    • [119]

      Young Jin Sa and Sang Hoon Joo*

      Recent Advances in M−N/C Electrocatalysts for Polymer Electrolyte Membrane Fuel Cells
    • NICE (News & Information for Chemical Engineers)
    • 35, 264-271 (2017).
    • [118]

      Shin Wook Kang, Kyeounghak Kim, Dong Hyun Chun, Jung-Il Yang, Ho-Tae Lee, Heon Jung, Jung Tae  Lim, Sanha Jang, Chul Sung Kim, Chan-Woo Lee, Sang Hoon Joo*, Jeong Woo Han*, and Ji Chan Park*

      High-Performance Fe5C2@CMK-3 Nanocatalyst for Selective and High-Yield Production of Gasoline-Range Hydrocarbons
    • J. Catal.
    • 349, 66-74 (2017). PDF Link
    • [117]

      Sungeun Jeoung, Bora Seo, Jeong Min Hwang, Sang Hoon Joo, and Hoi Ri Moon*

      Direct Conversion of Coordination Compounds into Ni2P Nanoparticles Entrapped in 3D Mesoporous Graphene for Efficient Hydrogen Evolution Reaction
    • Mater. Chem. Front.
    • 1, 973-978 (2017). PDF Link
    • [116]

      Nitin Kadulba Chaudhari*, Aram Oh, Young Jin Sa, Haneul Jin, Hionsuck Baik, Sang Gu Kim, Suk Joong Lee, Sang Hoon Joo, and Kwangyeol Lee*

      Morphology Controlled Synthesis of 2-D Ni–Ni3S2 and Ni3S2 Nanostructures on Ni Foam Towards Oxygen Evolution Reaction
    • Nano Convergence
    • 4, 7 (2017).
    • [115]

      Jae Hyung Kim, Young Jin Sa, Hu Young Jeong, and Sang Hoon Joo*

      Roles of Fe–Nx and Fe–Fe3C@C Species in Fe–N/C Electrocatalysts for Oxygen Reduction Reaction
    • ACS Appl. Mater. Interfaces
    • 9, 9567-9575 (2017). PDF Link
    • 115. ACSAMI
    • [114]

      Taehyun Kwon†, Hyeyoun Hwang†, Young Jin Sa†, Jongsik Park, Hionsuck Baik, Sang Hoon Joo*, and Kwangyeol Lee*

      Cobalt Assisted Synthesis of IrCu Hollow Octahedral Nanocages as Highly Active Electrocatalysts toward Oxygen Evolution Reaction
    • Adv. Funct. Mater.
    • 27, 1604688 (2017). PDF Link
    • 114. AFM

    [2016]

    • [113]

      Young Jin Sa, Dong-Jun Seo, Jinwoo Woo, Jung Tae Lim, Jae Yeong Cheon, Seung Yong Yang, Jae Myeong Lee, Dongwoo Kang, Tae Joo Shin, Hyeon Suk Shin, Hu Young Jeong, Chul Sung Kim*, Min Gyu Kim*, Tae-Young Kim*, and Sang Hoon Joo*

      A General Approach to Preferential Formation of Active Fe-Nx Sites in Fe-N/C Electrocatalysts for Efficient Oxygen Reduction Reaction
    • J. Am. Chem. Soc.
    • 138, 15046-15056 (2016). PDF Link
    • 113. JACS
    • [112]

      Yeonjun Shim, Jongwoo Han, Young Jin Sa, Seungjun Lee, Kwangrok Choi, Junghoon Oh, Sujin Kim, Sang Hoon Joo, and Sungjin Park*

      Electrocatalytic Performances of Heteroatom-Containing Functionalities in N-doped Reduced Graphene Oxides
    • J. Ind. Eng. Chem.
    • 42, 149-156 (2016).
    • [111]

      Ho Young Kim†, Seonghun Cho†, Young Jin Sa, Sun-Mi Hwang, Gu-Gon Park, Tae Joo Shin, Hu Young Jeong, Sung-Dae Yim*, and Sang Hoon Joo*

      Self-Supported Mesostructured Pt-Based Bimetallic Nanospheres Containing an Intermetallic Phase as Ultrastable Oxygen Reduction Electrocatalysts
    • Small
    • 12, 5347-5353 (2016). PDF Link
    • 109. Small 3
    • [110]

      Aram Oh†, Young Jin Sa†, Hyeyoun Hwang†, Hionsuck Baik, Jun Kim, Byeongyoon Kim, Sang Hoon Joo*, and Kwangyeol Lee*

      Rational Design of Pt-Ni-Co Ternary Alloy Nanoframe Crystals as Highly Efficient Catalysts toward Alkaline Hydrogen Evolution Reaction
    • Nanoscale
    • 8, 16379-16386 (2016). PDF Link
    • 112. Nanoscale 3
    • [109]

      Yoojin Yang†, Haneul Jin†, Ho Young Kim†, Jisun Yoon, Jongsik Park, Hionsuck Baik*, Sang Hoon Joo*, and Kwangyeol Lee*

      Ternary Dendritic Nanowires as Highly Active and Stable Multifunctional Electrocatalysts
    • Nanoscale
    • 8, 15167-15172 (2016). PDF Link
    • 110. Nanoscale 3
    • [108]

      Bora Seo†, Du San Baek†, Young Jin Sa, and Sang Hoon Joo*

      Shape Effects of Nickel Phosphide Nanocrystals on the Hydrogen Evolution Reaction
    • CrystEngComm.
    • 18, 6083-6089 (2016). PDF Link
    • – Invited contribution to the themed issue “Crystal engineering of composite materials.”

    • 그림1
    • [107]

      Jisun Yoon†, Jongsik Park†, Young Jin Sa†, Yoojin Yang, Hionsuck Baik, Sang Hoon Joo*, and Kwangyeol Lee*

      Synthesis of Bare Pt3Ni Nanorod from PtNi@Ni Core-Shell Nanorod by Acid Etching: One Step Surfactant Removal and Phase Conversion for Optimal Electrochemical Performance toward Oxygen Reduction Reaction
    • CrystEngComm
    • 18, 6002-6007 (2016). PDF Link
    • [106]

      Yeongjin Lim, Jinwoo Woo, Sang Hoon Joo, and Heungjoo Shin*

      Patternable Nanoporous Carbon Electrodes for Use as Supercapacitors
    • J. Electrochem. Soc.
    • 163, A1886-A1892 (2016).
    • [105]

      Bora Seo†, Young Jin Sa†, Jinwoo Woo, Kyungjung Kwon, Jongnam Park, Tae Joo Shin, Hu Young Jeong*, and Sang Hoon Joo*

      Size-Dependent Activity Trends Combined with In Situ X-Ray Absorption Spectroscopy Reveal Insights into Cobalt Oxide/Carbon Nanotube Catalyzed Bifunctional Oxygen Electrocatalysis
    • ACS Catal.
    • 6, 4347-4355 (2016). PDF Link
    • – Selected in ACS Select Virtual Issue “The Way Forward in Molecular Electrocatalysis​”

    • 105. ACS Catal_TOC
    • [104]

      Nam-In Kim†, Young Jin Sa†, Sung-Hwa Cho, Insub So, Kyungjung Kwon, Sang Hoon Joo*, and Jun-Young Park*

      Enhancing Activity and Stability of Cobalt Oxide Electrocatalysts for the Oxygen Evolution Reaction via Transition Metal Doping
    • J. Electrochem. Soc.
    • 163, F3020-F3028 (2016). PDF Link
    • [103]

      Seongwan Jang†, Young Jin Sa†, Sang Hoon Joo*, and Kang Hyun Park*

      Ordered Mesoporous Copper Oxide Nanostructures as Highly Active and Stable Catalysts for Aqueous Click Reactions
    • Catal. Commun.
    • 81, 24-28 (2016). PDF Link
    • [102]

      Jae Hyung Kim, Jae Yeong Cheon, Tae Joo Shin, Jeong Young Park, and Sang Hoon Joo*

      Effect of Surface Oxygen Functionalization of Carbon Support on the Activity and Durability of Pt/C Catalysts for the Oxygen Reduction Reaction
    • Carbon
    • 101, 449-457 (2016). PDF Link
    • 101 carbon
    • [101]

      Sun-Mi Hwang, YongMan Choi, Min Gyu Kim, Young-Jun Sohn, Jae Yeong Cheon, Sang Hoon Joo, Sung-Dae Yim, Kurian A. Kuttiyiel, Kotaro Sasaki, Radoslav R. Adzic, and Gu-Gon Park*

      Enhancement of Oxygen Reduction Activities by Pt Nanoclusters Decorated on Ordered Mesoporous Porphyrinic Carbons
    • J. Mater. Chem. A
    • 4, 5869-5879 (2016).
    • – Highlighted as an InsideCover paper

    • [100]

      Jae Yeong Cheon, Kyoungho Kim, Young Jin Sa, Sun Hye Sahgong, Yugyeong Hong, Jinwoo Woo, Sung-Dae Yim, Hu Young Jeong, Youngsik Kim*, and Sang Hoon Joo*

      Graphitic Nanoshell/Mesoporous Carbon Nanohybrids as Highly Efficient and Stable Bifunctional Oxygen Electrocatalysts for Rechargeable Aqueous Na-Air Batteries
    • Adv. Energy Mater.
    • 6, 1501794 (2016). PDF Link
    • 99. AEM
    • [99]

      Donghwan Yoon†, Bora Seo†, Jaeyoung Lee†, Kyoung Sik Nam, Byeongyoon Kim, Suhyun Park, Hionsuck Baik, Sang Hoon Joo*, and Kwangyeol Lee*

      Facet-Controlled Hollow Rh2S3 Hexagonal Nanoprisms as Highly Active and Structurally Robust Catalysts toward Hydrogen Evolution Reaction
    • Energy Environ. Sci.
    • 9, 850-856 (2016). PDF Link
    • – Highlighted as a BackCover paper

    • EES
    • [98]

      Fabiano Bernardi*, Michael E. Grass, Young P. Hong, Rui Chang, Naila Jabeen, Chunjuan Zhang, Bryan W. Eichhorn, Bora Seo, Selim Alayoglu , Zahid Hussain, Sang Hoon Joo, and Zhi Liu*

      Control of the Surface Atomic Population of Rh0.5Pd0.5 Bimetallic Nanoparticles Supported on CeO2
    • Catal Today
    • 260, 95-99 (2016).

    [2015]

    • [97]

      Jiha Choi, D. Amarathana Reddy, M. Jahurul Islam, Bora Seo, Sang Hoon Joo, and Tae Kyu Kim*

      Green Synthesis of the Reduced Graphene Oxide-CuI Quasi-Shell-Core Nanocomposite: A Highly Efficient and Stable Solar-Light-Induced Catalyst for Organic Dye Degradation in Water
    • Appl. Surf. Sci.
    • 358, 159-167 (2015).
    • [96]

      Bora Seo and Sang Hoon Joo*

      Noble-Metal Free Electrocatalysts for the Hydrogen Evolution Reaction
    • Catalysis
    • 31, 25-42 (2015).
    • [95]

      Jongwoo Han, Young Jin Sa, Yeonjun Shim, Min Choi, Noejung Park, Sang Hoon Joo*, and Sungjin Park*

      Coordination Chemistry of [Co(acac)2] with N-Doped Graphene: Implications for Oxygen Reduction Reaction Reactivity of Organometallic Co-O4-N Species
    • Angew. Chem. Int. Ed.
    • 54, 12622-12626 (2015). PDF Link
    • 95. ACIE
    • [94]

      L. Palanikumar, Ho Young Kim, Joon Yong Oh, Ajesh P Thomas, Eun Seong Choi, M. T. Jeena, Sang Hoon Joo, and Ja-Hyoung Ryu*

      Noncovalent Surface Locking of Mesoporous Silica Nanoparticles for Exceptionally High Hydrophobic Drug Loading and Enhanced Colloidal Stability
    • Biomacromolecules
    • 16, 2701-2714 (2015).
    • [93]

      Jong Hun Kim, Youngji Yuk, Hye Sook Joo, Jae Yeong Cheon, Han Shin Choi, Sang Hoon Joo, and Jeong Young Park*

      Nanoscale Adhesion between Pt Nanoparticles and Carbon Support and Its Influence on the Durability of Fuel Cells
    • Curr. Appl. Phys.
    • 15, S108-S114 (2015).
    • [92]

      Joonmo Park, Jae Won Lee, Byeong Uk Ye, Sung He Chun, Sang Hoon Joo, Hyunwoong Park, Heon Lee, Hu Young Jeong, Myung Hwa Kim, and Jeong Min Baik*

      Structural Evolution of Chemically-Driven RuO2 Nanowires and 3-Dimensional Design for PhotoCatalytic Application
    • Scientific Reports
    • 5, 11933 (2015).
    • [91]

      Bora Seo, Hu Young Jeong, Sung You Hong, Alla Zak, and Sang Hoon Joo*

      Impact of a Conductive Oxide Core in Tungsten Sulfide-Based Nanostructures on the Hydrogen Evolution Reaction
    • Chem. Commun.
    • 51, 8334-8337 (2015). PDF Link
    • 91. ChemComm
    • [90]

      Bora Seo†, Gwan Yeong Jung†, Young Jin Sa, Hu Young Jeong, Jae Yeong Cheon, Jeong Hyeon Lee, Ho Young Kim, Jin Chul Kim, Hyeon Suk Shin, Sang Kyu Kwak*, and Sang Hoon Joo*

      Monolayer-Precision Synthesis of Molybdenum Sulfide Nanoparticles and Their Nanoscale Size Effects in the Hydrogen Evolution Reaction
    • ACS Nano
    • 9, 3728-3739 (2015). PDF Link
    • 90. ACS Nano
    • [89]

      Kyung Joo Lee, Young Jin Sa, Hu Young Jeong, Christopher W. Bielawski, Sang Hoon Joo, and Hoi Ri Moon*

      Simple Coordination Complex-Derived Three Dimensional Mesoporous Graphene as an Efficient Bifunctional Oxygen Electrocatalyst
    • Chem. Commun.
    • 51, 6773-6776 (2015). PDF Link
    • 89._CC
    • [88]

      Aram Oh, Hionsuck Baik, Dong Shin Choi, Jae Yeong Cheon, Byeongyoon Kim, Heejin Kim, Seong Jung Kwon, Sang Hoon Joo*, Yousung Jung*, and Kwangyeol Lee*

      Skeletal Octahedral Nanoframe with Cartesian Coordinates via Geometrically Precise Nanoscale Phase Segregation in a Pt@Ni Core-Shell Nanocrystal
    • ACS Nano
    • 9, 2856-2867 (2015). PDF Link
    • 88. ACS Nano
    • [87]

      Chiyoung Park, Yunju La, Tae Hyun An, Hu Young Jeong, Sebyung Kang, Sang Hoon Joo, Hyungju Ahn, Tae Joo Shin, and Kyoung Taek Kim*

      Mesoporous Monoliths of Inverse Bicontinuous Cubic Phases of Block Copolymer Bilayers
    • Nature Commun.
    • 6, 6392 (2015).
    • [86]

      L. Palanikumar, Eunsung Choi, Jae Yeong Cheon, Sang Hoon Joo*, and Ja-Hyoung Ryu*

      Noncovalent Polymer-Gatekeeper in Mesoporous Silica Nanoparticles as a Targeted Drug Delivery Platform
    • Adv. Funct. Mater.
    • 25, 957-965 (2015). PDF Link

    [2014]

    • [85]

      Mi-Sook Kwon, Aram Choi, Yuwon Park, Jae Yeong Cheon, Hyojin Kang, Yongnam Jo, Youngjun Kim, Sung You Hong, Sang Hoon Joo, Changduk Yang*, and Kyu Tae Lee*

      Synthesis of Ordered Mesoporous Phenanthrenequinone-Carbon via π-π Interaction-Dependent Vapor Pressure for Rechargeable Batteries
    • Scientific Reports
    • 4, 7404 (2014).
    • [84]

      Seungjun Lee, Jae Yeong Cheon, Won Jun Lee, Sang Ouk Kim, Sang Hoon Joo, and Sungjin Park*

      Production of Novel FeOOH/Reduced Graphene Oxide Hybrids and Their Performances as Oxygen Reduction Reaction Catalyst
    • Carbon
    • 80, 127-134 (2014).
    • [83]

      Young-Eun Shin, Young Jin Sa, Seungyoung Park, Jiwon Lee, Kyung-Hee Shin, Sang Hoon Joo*, and Hyunhyub Ko*

      An Ice-Templated, pH-Tunable Self-assembly Route to Hierarchically Porous Graphene Nanoscroll Networks
    • Nanoscale
    • 6, 9734-9741 (2014). PDF Link
    • [82]

      Jae Hwa Lee†, Young Jin Sa†, Tae Kyung Kim, Hoi Ri Moon*, and Sang Hoon Joo*

      A Transformative Route to Nanoporous Manganese Oxides of Controlled Oxidation States with Identical Textural Properties
    • J. Mater. Chem. A
    • 2, 10435-10443 (2014). PDF Link
    • 82. JMCA
    • [81]

      Jongwoo Han, Jae Yeong Cheon, Sang Hoon Joo, and Sungjin Park*

      Synthesis of Boron and Nitrogen Co-Doped Graphene Nano-Platelets Using a Two-Step Solution Process and Catalytic Properties for Oxygen Reduction Reaction
    • Solid State Sci.
    • 33, 1-5 (2014).
    • [80]

      Jae Yeong Cheon, Jong Hun Kim, Jae Hyung Kim, Kalyan C. Goddeti, Jeong Young Park*, and Sang Hoon Joo*

      Intrinsic Relationship between Enhanced Oxygen Reduction Reaction Activity and Nanoscale Work Function of Doped Carbons
    • J. Am. Chem. Soc.
    • 136, 8875-8878 (2014). PDF Link
    • 80. JACS
    • [79]

      Yunju La, Chiyoung Park, Tae Joo Shin, Sang Hoon Joo, Sebyung Kang, and Kyoung Taek Kim*

      Colloidal Inverse Bicontinuous Cubic Membranes of Block Copolymers with Tunable Surface Functional Groups
    • Nature Chem.
    • 6, 534-541 (2014).
    • [78]

      Nam-In Kim†, Jae Yeong Cheon†, Jae Hyung Kim, Jinhae Seong, Jun-Young Park, Sang Hoon Joo*, and Kyungjung Kwon*

      Impact of Framework Structure of Ordered Mesoporous Carbons on the Performance of Supported Pt Catalysts for Oxygen Reduction Reaction
    • Carbon
    • 72, 354-364 (2014). PDF Link
    • 78. Carbon
    • [77]

      Young Jin Sa and Sang Hoon Joo*

      Recent Trends and Perspectives in Non-Platinum Oxygen Reduction Reaction Catalysts
    • E.Chem.
    • 5, 28-39 (2014).
    • [76]

      Young Jin Sa†, Chiyoung Park†, Hu Young Jeong, Seok-Hee Park, Zonghoon Lee, Kyoung Taek Kim, Gu-Gon Park, and Sang Hoon Joo*

      Carbon Nanotubes/Heteroatom-Doped Carbon Core-Sheath Nanostructures as Highly Active, Metal-Free Oxygen Reduction Electrocatalysts for Alkaline Fuel Cells
    • Angew. Chem. Int. Ed.
    • 53, 4102-4106 (2014). PDF Link
    • – Selected as “Hot Paper” by Angew. Chem. Int. Ed.

    • 76. ACIE
    • [75]

      Eun Hwa Lee, Mi-Jin Jeon, Jong-Ki Jeon, Dong Jin Suh, Sung Hoon Park, Bora Seo, Sang Hoon Joo, and Young-Kwon Park*

      In situ Catalytic Pyrolysis of Miscanthus over Modified SBA-15 Catalysts Using Py-GC/MS
    • J. Nanosci. Nanotechnol.
    • 14, 2343-2351 (2014).
    • [74]

      Hyung Won Lee, Suek Joo Choi, Sung Hoon Park, Jong-Ki Jeon, Sang-Chul Jung, Sang Hoon Joo, and Young-Kwon Park*

      Catalytic Conversion of Laminaria Japonica over Microporous Zeolites
    • Energy
    • 66, 2-6 (2014).

    [2013]

    • [73]

      Sang Hoon Joo*, Jae Yeong Cheon, and Joon Yong Oh

      Core-Shell Nanoarchitectures as Stable Nanocatalysts
    • Chapter 5 in “Current Trends of Surface Science and Catalysis”
    • pp 93-119 (2013).
    • – Jeong Young Park Ed., Springer, Berlin, Germany.

    • [72]

      Boram Jun, Kwang-Eun Jeong, Sang Hoon Joo, Young Jin Sa, Sung Hoon Park, Jong-Ki Jeon, and Young-Kwon Park*

      Catalytic Conversion of Undaria Pinnatifida over Nanoporous Materials Using Py-GC/MS
    • J. Nanosci. Nanotech.
    • 13, 7794-7800 (2013).
    • [71]

      Sun Mi Kim, Kamran Qadir, Bora Seo, Hu Young Jeong, Sang Hoon Joo, Osamu Terasaki, and Jeong Young Park*

      Nature of Rh Oxide on Rh Nanoparticles and Its Effect on Catalytic Activity of CO Oxidation
    • Catal. Lett.
    • 143, 1153-1161 (2013).
    • [70]

      Jae Yeong Cheon, Taeyoung Kim, YongMan Choi, Hu Young Jeong, Min Gyu Kim, Young Jin Sa, Jaesik Kim, Zonghoon Lee, Tae-Hyun Yang, Kyungjung Kwon, Osamu Terasaki, Gu-Gon Park*, Radoslav R. Adzic*, and Sang Hoon Joo*

      Ordered Mesoporous Porphyrinic Carbons with Very High Electrocatalytic Activity for the Oxygen Reduction Reaction
    • Scientific Reports
    • 3, 2715 (2013). PDF Link
    • 70. SciRep
    • [69]

      Young Jin Sa, Kyungjung Kwon, Jae Yeong Cheon, Freddy Kleitz, and Sang Hoon Joo*

      Ordered Mesoporous Co3O4 Spinels as Stable, Bifunctional, Noble Metal-Free Oxygen Electrocatalysts
    • J. Mater. Chem. A
    • 1, 9992-10001 (2013). PDF Link
    • 69. JMCA
    • [68]

      Hyung Won Lee, Jong-Ki Jeon, Kwang-Eun Jeong, Soon-Yong Jeong, Jeongsik Han, Bora Seo, Sang Hoon Joo, and Young-Kwon Park*

      Effect of Pt Particle Size on the Hydroisomerization of n-Dodecane Over Pt/Al-SBA-15 Catalysts
    • J. Nanosci. Nanotechnol.
    • 13, 6074-6078 (2013).
    • [67]

      Tae Kyung Kim, Jae Yeong Cheon, Kyung Yoo, Jung Woo Kim, Sung-min Hyun, Hyeon Suk Shin,* Sang Hoon Joo*, and Hoi Ri Moon*

      Three-Dimensional Pillared Metallomacrocycle-Graphene Frameworks with Tunable Micro- and Mesoporosity
    • J. Mater. Chem. A
    • 1, 8432-8437 (2013). PDF Link
    • JMC
    • [66]

      Tae Kyung Kim, Kyung Joo Lee, Jae Yeong Cheon, Jae Hwa Lee, Sang Hoon Joo*, and Hoi Ri Moon*

      Nanoporous Metal Oxides with Tunable and Nanocrystalline Frameworks via Conversion of Metal-Organic Frameworks
    • J. Am. Chem. Soc.
    • 135, 8940-8946 (2013). PDF Link
    • – Highlighted in “Editors’ Choice” in Science 340, 1377 (2013): “From MOFs to Mesoporous Oxides”.

    • 66. JACS
    • [65]

      Sang Hun Han, Jae Yeong Cheon, Sang Hoon Joo*, and Jae-Seung Lee*

      Seed-Mediated Synthesis and Structural Analysis of Hierarchical Silver Microparticles (HiAgMPs) with Highly Nanotextured Surfaces
    • Mater. Res. Bull.
    • 48, 2333-2339 (2013).
    • [64]

      Mi-Jin Jeon, Jong-Ki Jeon, Dong Jin Suh, Sung Hoon Park, Young Jin Sa, Sang Hoon Joo, and Young-Kwon Park*

      Catalytic Pyrolysis of Biomass Component over Mesoporous Catalysts Using Py-GC/MS
    • Catal. Today
    • 204, 170-178 (2013).
    • [63]

      Jeong Wook Kim, Sang Hoon Joo, Bora Seo, Seong-Soo Kim, Dae-Hyun Shin, Sung Hoon Park, Jong-Ki Jeon, and Young-Kwon Park*

      Bio-Oil Upgrading via Catalytic Pyrolysis of Waste Mandarin Residue over SBA-15 Catalysts
    • J. Nanosci. Nanotechnol.
    • 13, 2566-2572 (2013).
    • [62]

      Ju Hae Jung, Se Hoon Kim, Seung Hyun Hur, Sang Hoon Joo, Won Mook Choi, and Junbom Kim*

      Polymer Electrolyte Membrane Fuel Cell Performance Degradation by Coolant Leakage and Recovery
    • J. Power Sources
    • 226, 320-328 (2013).
    • [61]

      Jae Yeong Cheon, Chi Yeong Ahn, Dae Jong You, Chanho Pak, Seung Hyun Hur, Junbom Kim*, and Sang Hoon Joo*

      Ordered Mesoporous Carbon-Carbon Nanotube Nanocomposites as Highly Conductive and Durable Cathode Catalyst Supports for Polymer Electrolyte Fuel Cells
    • J. Mater. Chem. A
    • 1, 1270-1283 (2013). PDF Link
    • 61. JMCA
    • [60]

      Chi-Yeong Ahn, Jae Yeong Cheon, Sang Hoon Joo, and Junbom Kim*

      Effects of Ionomer Content on Pt Catalyst/Ordered Mesoporous Carbon Support in Polymer Electrolyte Membrane Fuel Cells
    • J. Power Sources
    • 222, 477-482 (2013).

    [2012]

    • [59]

      Kamran Qadir, Sang Hoon Joo, Bongjin S. Mun, Derek R. Butcher, J. Russell Renzas, Funda Aksoy, Zhi Liu, Gabor A. Somorjai*, and Jeong Young Park*

      Intrinsic Relation between Catalytic Activity of CO Oxidation on Ru Nanoparticles and Ru Oxides Uncovered with Ambient Pressure XPS
    • Nano Lett.
    • 12, 5761-5768 (2012). PDF Link
    • [58]

      Ha Rim Choi, Hyunje Woo, Seongwan Jang, Jae Young Cheon, Chungho Kim, Jongnam Park, Kang Hyun Park*, and Sang Hoon Joo*

      Ordered Mesoporous Carbon Supported Colloidal Pd Nanoparticle Model Catalysts for Suzuki Coupling Reaction: Influence of Organic Capping Agents
    • ChemCatChem.
    • 4, 1587-1594 (2012). PDF Link
    • 58. ChemCatChem
    • [57]

      Yimhyun Jo†, Jae Yeong Cheon†, Jeonghun Yu, Hu Young Jeong, Chi-Hwan Han, Yongseok Jun*, and Sang Hoon Joo*

      Highly Interconnected Ordered Mesoporous Carbon – Carbon Nanotube Nanocomposites: Pt-free, Highly efficient, and Durable Counter Electrode for Dye-Sensitized Solar Cells
    • Chem. Commun.
    • 48, 8057-8059 (2012). PDF Link
    • – Highlighted as a BackCover paper

    • 57. ChemComm
    • [56]

      Jin Yeong Kim, Kyung Ju Lee, Mingshi Jin, Jae Yeong Cheon, Sang Hoon Joo*, Ji Man Kim*, and Hoi Ri Moon*

      In Situ-Generated Metal Oxide Catalyst during CO Oxidation Reaction Transformed from Redox-Active Metal-Organic Framework Supported Palladium Nanoparticles
    • Nanoscale Res. Lett.
    • 7, 461 (2012). PDF Link
    • NRL
    • [55]

      Ju-Hwan Oh, Young Jin Sa, Sang Hoon Joo*, and Jae-Seung Lee*

      Assembling Gold Nanocubes Into a Nanoporous Gold Material
    • Bull. Kor. Chem. Soc.
    • 33, 1777-1780 (2012).
    • [54]

      Sunmi Kim, Kamran Qadir, Sookyoung Jin, A. Satyanarayana Reddy, Bora Seo, B. S. Mun, Sang Hoon Joo, and Jeong Young Park*

      Trend of Catalytic Activity of CO Oxidation on Rh and Ru Nanoparticles: Role of Surface Oxide
    • Catal. Today
    • 185, 131-137 (2012).
    • [53]

      Dae Jong You, Kyungjung Kwon*, Sang Hoon Joo, Jin Hoe Kim, Ji Man Kim, Chanho Pak*, and Hyuk Chang

      Carbon-Supported Ultra-High Loading Pt Nanoparticle Catalyst by Controlled Overgrowth of Pt: Improvement of Pt Utilization Leads to Enhanced Direct Methanol Fuel Cell Performance
    • Int. J. Hydrogen Energy
    • 37, 6880-688 (2012).
    • [52]

      Jeong Y. Park, Yawen Zhang, Sang Hoon Joo, Yousung Jung, and Gabor A. Somorjai*

      Size Effect of RhPt Bimetallic Nanoparticles in Catalytic Activity of CO Oxidation: Role of Surface Segregation
    • Catal. Today
    • 181, 133-137 (2012).
    • [51]

      Kyungjung Kwon, Young Jin Sa, Jae Yeong Cheon, and Sang Hoon Joo*

      Ordered Mesoporous Carbon Nitrides with Graphitic Frameworks as Metal-Free, Highly Durable, Methanol-Tolerant Oxygen Reduction Catalysts in an Acidic Medium
    • Langmuir
    • 28, 991-996 (2012). PDF Link
    • 51. Langmuir

    [2011]

    • [50]

      A. S. Reddy, Sunmi Kim, Hu Young Jeong, Sookyoung Jin, Kamran Qadir, Kyoungmin Jung, Chan Ho Jung, Jung Yeul Yun, Jae Yeong Cheon, Jun-Mo Yang, Sang Hoon Joo, Osamu Terasaki, and Jeong Young Park*

      Ultrathin Titania Coating for High-Temperature Stable SiO2/Pt Nanocatalysts
    • Chem. Commun.
    • 47, 8142-8144 (2011).
    • [49]

      Funda Aksoy, Michael E. Grass, Sang Hoon Joo, Naila Jabeen, Young Pyo Hong, Zahid Hussain, Bongjin S. Mun, and Zhi Liu*

      Study of Electro-Chemical Properties of Metal-Oxide Interfaces Using a Newly Constructed Ambient Pressure X-ray Photoelectron Spectroscopy Endstation
    • Nucl. Inst. Meth.
    • A 645, 260-265 (2011).
    • [48]

      Sang Hoon Joo*

      Model Catalysts based on Colloid Nanoparticles (콜로이드 나노입자 기반 모델 촉매 연구)
    • Catalysis
    • 27, 52-69 (2011).
    • [47]

      Kyungjung Kwon, Seon-ah Jin, Chanho Pak*, Hyuk Chang, Sang Hoon Joo, Hyung Ik Lee, Jin Hoe Kim, and Ji Man Kim*

      Enhancement of Electrochemical Stability and Catalytic Activity of Pt Nanoparticles via Strong Metal-Support Interaction with Sulfur-Containing Ordered Mesoporous Carbon
    • Catal. Today
    • 164, 186-189 (2011).

    [2010]

    • [46]

      Sang Hoon Joo, Jeong Y. Park, J. Russell Renzas, Derek R. Butcher, Wenyu Huang, and Gabor A. Somorjai*

      Size Effect of Ruthenium Nanoparticles in Catalytic Carbon Monoxide Oxidation
    • Nano Lett.
    • 10, 2709-2713 (2010). PDF Link
    • [45]

      Gabor A. Somorjai* and Sang Hoon Joo

      Monodisperse Metal Nanoparticle Catalysts on Silica Mesoporous Supports: Synthesis, Characterizations, and Catalytic Reactions
    • Chapter 12 in “Silica and Silicates in Modern Catalysis”, pp 277-311 (2010).
    • Istvan Halasz Ed., Transworld Research Network, Kerala, India

    • [44]

      Yuri Borodko, Hyun-Sook Lee, Sang Hoon Joo, Yawen Zhang, and Gabor A. Somorjai*

      Spectroscopic Study of the Thermal Degradation of PVP-Capped Rh and Pt Nanoparticles in H2 an O2 Environments
    • J. Phys. Chem. C
    • 114, 1117-1126 (2010).

    [2009 ~]

    • [43]

      Sang Hoon Joo, Kyungjung Kwon, Dae Jong Yoo, Chanho Pak*, Hyuk Chang, and Ji Man Kim

      Preparation of High Loading Pt Nanoparticles on Ordered Mesoporous Carbon with a Controlled Pt Particle Size and Its Effects on Oxygen Reduction and Methanol Oxidation Reactions
    • Electrochim. Acta
    • 54, 5746-5753 (2009).
    • [42]

      Hyung Ik Lee†, Sang Hoon Joo†, Jin Hoe Kim, Dae Jong You, Ji Man Kim*, Jung-Nam Park, Hyuk Chang, and Chanho Pak*

      Ultrastable Pt Nanoparticles Supported on Sulfur-Containing Ordered Mesoporous Carbon via Strong Metal-Support Interaction
    • J. Mater. Chem.
    • 19, 5934-5939 (2009).
    • – Highlighted as an InsideCover Paper

    • [41]

      Michael E. Grass, Sang Hoon Joo, Yawen Zhang, and Gabor A. Somorjai*

      Colloidally Synthesized Monodisperse Rh Nanoparticles Supported on SBA-15 for Size- and Pretreatment-Dependent Studies of CO Oxidation
    • J. Phys. Chem. C
    • 113, 8616-8623 (2009).
    • [40]

      Sang Hoon Joo, Jeong Y. Park, Chia-Kuang Tsung, Yusuke Yamada, Peidong Yang, and Gabor A. Somorjai*

      Thermally Stable Pt/Mesoporous Silica Core–Shell Nanocatalysts for High-Temperature Reactions
    • Nature Mater.
    • 8, 126-131 (2009).
    • – Highlighted as a Cover Paper
      News and Views in Nature Materials: “Nanocatalysis: More than Speed”

    • [39]

      Sang Hoon Joo, Hyung Ik Lee, Dae Jong Yoo, Kyungjung Kwon, Jin Hoe Kim, Yeong Suk Choi, Min Kang, Ji Man Kim*, Chanho Pak*, Hyuk Chang, and Doyoung Seung

      Ordered Mesoporous Carbons with Controlled Particle Sizes as Catalyst Supports for Direct Methanol Fuel Cell Cathodes
    • Carbon
    • 46, 2034-2045 (2008).
    • [38]

      Yeong Suk Choi*, Tae Kyoung Kim, Eun Ah Kim, Sang Hoon Joo, Chanho Pak, Yoon Hoi Lee, Hyuk Chang, and Doyoung Seung

      Exfoliated Sulfonated Poly(arylene ether sulfone)–Clay Nanocomposites
    • Adv. Mater.
    • 20, 2341-2344 (2008).
    • [37]

      Hee Tak Kim*, Dae Jong You, Hae-Kwon Yoon, Sang Hoon Joo, Chanho Pak, Hyuk Chang, and Inseob Song

      Cathode Catalyst Layer Using Supported Pt Catalyst on Ordered Mesoporous Carbon for Direct Methanol Fuel Cell
    • J. Power Sources
    • 180, 724-732 (2008).
    • [36]

      Sang Hoon Joo, Chanho Pak, Eun Ah Kim, Yoon Hoi Lee, Hyuk Chang, Doyoung Seung, Yeung Suk Choi*, and Tae Kyoung Kim

      Functionalized Carbon Nanotube-Poly(arylene sulfone) Composites for Direct Methanol Fuel Cells with Enhanced Performances
    • J. Power Sources
    • 180, 63-70 (2008).
    • [35]

      Hyung Ik Lee, Jin Hoe Kim, Dae Jong You, Ji Eun Lee, Ji Man Kim*, Wha-Seung Ahn, Chanho Pak*, Sang Hoon Joo, Hyuk Chang, and Doyoung Seung

      Rational Synthesis Pathway for Ordered Mesoporous Carbon with Controllable 30 to 100 Angstrom Pores
    • Adv. Mater.
    • 20, 757-762 (2008).
    • [34]

      Hyung Ik Lee, Jin Hoe Kim, Sang Hoon Joo, Hyuk Chang, Doyoung Seung, Oh-Shim Joo, Dong Jin Suh, Wha-Seung Ahn, Chanho Pak*, and Ji Man Kim*

      Ultrafast Production of Ordered Mesoporous Carbons via Microwave Irradiation
    • Carbon
    • 45, 2851-2854 (2007).
    • [33]

      Hyuk Chang*, Sang Hoon Joo, and Chanho Pak

      Synthesis and Characterizations of Mesoporous Carbon for Fuel Cell Applications
    • J. Mater. Chem.
    • 17, 3078-3088 (2007).
    • [32]

      Chanho Pak*, Sang Hoon Joo, Dae Jong You, Ji Man Kim, Hyuk Chang, and Doyoung Seung

      Direct Sulfonation of Ordered Mesoporous Carbon for Catalyst Support of Direct Methanol Fuel Cell
    • Stud. Surf. Sci. Catal.
    • 165, 401-404 (2007).
    • [31]

      Chanho Pak*, Sang Hoon Joo, Dae Jong You, Hyung Ik Lee, Ji Man Kim, Hyuk Chang, and Doyoung Seung

      Ordered Mesoporous Carbon as New Support for Direct Methanol Fuel Cell: Controlling Microporosity and Graphitic Character
    • Stud. Surf. Sci. Catal.
    • 165, 397-400 (2007).
    • [30]

      Sang Hoon Joo, Chanho Pak*, Dae Jong Yoo, Seol-Ah Lee, Hyung Ik Lee, Ji Man Kim, Hyuk Chang, and Doyoung Seung

      Ordered Mesoporous Carbons (OMC) as Supports of Electrocatalysts for Direct Methanol Fuel Cells (DMFC): Effect of Carbon Precursors of OMC on DMFC Performances
    • Electrochim. Acta
    • 52, 1618-1626 (2006).
    • [29]

      Dae Jong You, Seol-Ah Lee, Sang Hoon Joo, Chanho Pak*, Hyuk Chang, Doyoung Seung

      Preparation of Ultra High Loading Supported Pt Catalyst for Direct Methanol Fuel Cell
    • Stud. Surf. Sci. Catal.
    • 162, 537-544 (2006).
    • [28]

      Yeong Suk Choi, Sang Hoon Joo, Seol-Ah Lee, Chanho Pak*, Hansu Kim, Hyuk Chang, and Doyoung Seung

      Surface Selective Polymerization of Polypyrrole on Ordered Mesoporous Carbon: Enhancing Interfacial Conductivity for Direct Methanol Fuel Cell Application
    • Macromolecules
    • 39, 3275-3282 (2006).
    • [27]

      Chanho Pak*, Sang Hoon Joo, and Gary Haller

      Nitrogen-Adsorption of Cobalt-Incorporated MCM-41 Materials after Compression at High Pressure
    • J. Ind. Eng. Chem.
    • 11, 756-761 (2005).
    • [26]

      Ryong Ryoo* and Sang Hoon Joo

      Nanostructured Carbon Materials Synthesized from Mesoporous Silica Crystals by Replication
    • Stud. Surf. Sci. Catal.
    • 148, 241-260 (2004).
    • [25]

      Young-Soo Ahn*, Hong Soo Kim, Moon Hee Han, Shinae Jun, Sang Hoon Joo, Ryong Ryoo, and Sung June Cho

      Friedel–Crafts Alkylation over Al-Incorporated Mesoporous Honeycomb
    • Stud. Surf. Sci. Catal.
    • 146, 669-672 (2003).
    • [24]

      L. A. Solovyov*, O. V. Belousov, A. N. Shmakov, V. I. Zhakovskii, Sang Hoon Joo, R. Ryoo, E. Haddad, A. Gedeon, and S. D. Kirik

      X-Ray Diffraction Analysis of Mesostructured Materials by Continuous Density Function Technique
    • Stud. Surf. Sci. Catal.
    • 146, 299-302 (2003).
    • [23]

      Osamu Terasaki*, Zheng Liu, Tetsu Ohsuna, T. Kamiyama, D. Shindo, Kenji Hiraga, Sang Hoon Joo, Tae-Wan Kim, and Ryong Ryoo

      Structures of Silica–Mesoporous Crystals and Novel Mesoporous Carbon-Networks Synthesized within the Pores
    • Stud. Surf. Sci. Catal.
    • 146, 275-278 (2003).
    • [22]

      Ji Man Kim*, Min Kang, Seung Hwan Yi, Jai Eui Yie, Sang Hoon Joo, and Ryong Ryoo

      Regeneration of Mesoporous Inorganic Materials Using Ordered Mesoporous Carbon as the Template
    • Stud. Surf. Sci. Catal.
    • 146, 53-56 (2003).
    • [21]

      Sang Hoon Joo, Ryong Ryoo*, Michal Kruk, and Mietek Jaroniec*

      Thermally Induced Structural Changes in SBA-15 and MSU-H Silicas and their Implications for Synthesis of Ordered Mesoporous Carbons
    • Stud. Surf. Sci. Catal.
    • 146, 49-52 (2003).
    • [20]

      Jae-Seung Lee, Sang Hoon Joo, and Ryong Ryoo*

      Synthesis of Mesoporous Carbons with Various Pore Diameters via Control of Pore Wall Thickness of Mesoporous Silicas
    • Stud. Surf. Sci. Catal.
    • 146, 33-36 (2003).
    • [19]

      Hans Darmstadt*, Christian Roy, Serge Kaliaguine, Sang Hoon Joo, and Ryong Ryoo

      Pore Structure and Graphitic Surface Nature of Ordered Mesoporous Carbons Probed by Low-Pressure Nitrogen Adsorption
    • Microporous Mesoporous Mater.
    • 60, 139-149 (2003).
    • [18]

      Shunai Che, Kristina Lund, Takashi Tatsumi, Sumio Iijima, Sang Hoon Joo, Ryong Ryoo, and Osamu Terasaki*

      Direct Observation of 3D Mesoporous Structure by Scanning Electron Microscopy (SEM): SBA-15 Silica and CMK-5 Carbon
    • Angew. Chem. Int. Ed.
    • 42, 2182-2185 (2003).
    • [17]

      Michal Kruk, Mietek Jaroniec*, Sang Hoon Joo, and Ryong Ryoo*

      Characterization of Regular and Plugged SBA-15 Silicas by Using Adsorption and Inverse Carbon Replication, and Explanation of the Plug Formation Mechanism
    • J. Phys. Chem. B
    • 107, 2205-2213 (2003).
    • [16]

      L. A. Solovyov*, A. N. Shmakov, V. I. Zaikovskii, Sang Hoon Joo, and Ryong Ryoo

      Detailed Structure of the Hexagonally Packed Mesostructured Carbon Material CMK-3
    • Carbon
    • 40, 2477-2481 (2002).
    • [15]

      Valentyn Antochshuk, Mietek Jaroniec*, Sang Hoon Joo, and Ryong Ryoo

      Mesoporous Materials for Heavy Metal Ion Adsorption Synthesized by Displacement of Polymeric Template
    • Stud. Surf. Sci. Catal.
    • 141, 607 (2002).
    • [14]

      Sang Hoon Joo, Ryong Ryoo, Michal Kruk, and Mietek Jaroniec

      Evidence for General Nature of Pore Interconnectivity in 2-Dimensional Hexagonal Mesoporous Silicas Prepared Using Block Copolymer Templates
    • J. Phys. Chem. B
    • 106, 4640-4646 (2002).
    • [13]

      Jae-Seung Lee, Sang Hoon Joo, and Ryong Ryoo*

      Synthesis of Mesoporous Silicas of Controlled Pore Wall Thickness and Their Replication to Ordered Nanoporous Carbons with Various Pore Diameters
    • J. Am. Chem. Soc.
    • 124, 1156-1157

      (2002).
    • [12]

      Mizue Kaneda, Toshikazu Tsubakiyama, Anna Carlsson, Yasuhiro Sakamoto, Tetsu Ohsuna, Osamu Terasaki*, Sang Hoon Joo, and Ryong Ryoo

      Structural Study of Mesoporous MCM-48 and Carbon Networks Synthesized in the Spaces of MCM-48 by Electron Microscopy
    • J. Phys. Chem. B
    • 106, 1256-1266 (2002).
    • [11]

      Sang Hoon Joo, Seong Jae Choi, Ilwhan Oh, Juhyoun Kwak, Zheng Liu, Osamu Terasaki, and Ryong Ryoo*

      Ordered Nanoporous Arrays of Carbon Supporting High Dispersions of Platinum Nanoparticles
    • Nature
    • 412, 169-172 (2001).
    • [10]

      W. S. Ahn*, K. I. Min, Y. M. Chung, H.-K. Rhee, Sang Hoon Joo, and Ryong Ryoo

      Novel Mesoporous Carbon as a Catalyst Support for Pt and Pd for Liquid Phase Hydrogenation Reaction
    • Stud. Surf. Sci. Catal.
    • 135, 313 (2001).
    • [9]

      Ryong Ryoo*, Sang Hoon Joo, Shinae Jun, T. Tsubakiyama, and O. Terasaki

      Ordered Mesoporous Carbon Molecular Sieves by Templated Synthesis: The Structural Varieties
    • Stud. Surf. Sci. Catal.
    • 135, 150 (2001).
    • [8]

      Ryong Ryoo*, Sang Hoon Joo, Michal Kruk, and Mietek Jaroniec*

      Ordered Mesoporous Carbons
    • Adv. Mater.
    • 13, 677-680

      (2001).
    • [7]

      Sang Hoon Joo, Shinae Jun, and Ryong Ryoo*

      Synthesis of Ordered Mesoporous Carbon Molecular Sieves CMK-1
    • Microporous Mesoporous Mater.
    • 44-45, 153-158 (2001).
    • [6]

      Shinae Jun, Sang Hoon Joo, Ryong Ryoo*, Michal Kruk, Mietek Jaroniec, Zheng Liu, Tetsu Ohsuna, and Osamu Terasaki

      Synthesis of New, Nanoporous Carbon with Hexagonally Ordered Mesostructure
    • J. Am. Chem. Soc.
    • 122, 10712-10713 (2000).
    • [5]

      Michal Kruk, Mietek Jaroniec*, Ryong Ryoo, and Sang Hoon Joo

      Characterization of Ordered Mesoporous Carbons Synthesized Using MCM-48 Silica as Templates
    • J. Phys. Chem. B
    • 104, 7960-7968 (2000).
    • [4]

      Michal Kruk, Mietek Jaroniec*, Ryong Ryoo, and Sang Hoon Joo

      Characterization of MCM-48 Silicas with Tailored Pore Sizes Synthesized via a Highly Efficient Procedure
    • Chem. Mater.
    • 12, 1414-1421 (2000).
    • [3]

      Anna Carlsson, Mizue Kaneda, Yasuhiro Sakamoto, Osamu Terasaki*, Ryong Ryoo, and Sang Hoon Joo

      The Structure of MCM-48 Determined by Electron Crystallography
    • J. Electron Microscopy
    • 48, 795-798 (1999).
    • [2]

      Ryong Ryoo*, Sang Hoon Joo, and Shinae Jun

      Synthesis of Highly Ordered Carbon Molecular Sieves via Template-Mediated Structural Transformation
    • J. Phys. Chem. B
    • 103, 7743-7746

      (1999).
    • [1]

      Ryong Ryoo*, Sang Hoon Joo, and Ji Man Kim

      Energetically Favored Formation of MCM-48 from Cationic-Neutral Surfactant Mixtures
    • J. Phys. Chem. B
    • 103, 7435-7440

      (1999).