1
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Pham TKN, Bruffey E, Nguyen AT, Rivera-Maldonado RA, Kuo DY, Cossairt B, Lee W, Severa G, Brown JJ. Deposition of Ultrathin MgB 2 Films from a Suspension Using Cosolvent Marangoni Flow. Langmuir 2023; 39:3853-3861. [PMID: 36893476 DOI: 10.1021/acs.langmuir.2c02933] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Magnesium diboride (MgB2) has demonstrated, theoretically and experimentally, promise as a candidate material for hydrogen storage and has thus attracted much contemporary research interest. To study hydrogen gas adsorption on MgB2 thin films using a quartz crystal microbalance (QCM)─a workhorse apparatus for this specific experiment─MgB2 must be deposited uniformly on the active surface of the QCM without damaging the quartz's performance. In work presented here, a wet-chemistry colloid synthesis and deposition process of a MgB2 thin film on a gold (Au) surface was established to avoid the extreme conditions of conventional physical deposition methods. This process also counteracts the unwanted phenomena of drying droplets on a solid surface, particularly the coffee-ring effect. To verify the normal function of the QCM after MgB2 deposition and its ability to obtain meaningful data, simple gas adsorption tests were conducted on the QCM, and the MgB2 film on the QCM was characterized with X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM) for elemental analysis and surface roughness, respectively. To obtain information about the thickness and the involvement of the coffee-ring effect, the same synthesis route was applied on a similar gold substrate─an evaporated Au film on glass. XPS characterization of the film and its precursor suspension shows the potential existence of both MgB2 and its oxide forms. The film's thickness on evaporated Au was measured by scanning transmission electron microscopy (STEM) to be 3.9 nm. The resulting samples show mitigation of the coffee-ring effect through roughness measurements with AFM at two scan sizes of 50 × 50 and 1 × 1 μm2.
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Affiliation(s)
- Thi Kieu Ngan Pham
- Department of Mechanical Engineering, University of Hawai'i at Ma̅noa, Honolulu, Hawai'i 96822, United States
| | - Edward Bruffey
- Department of Mechanical Engineering, University of Hawai'i at Ma̅noa, Honolulu, Hawai'i 96822, United States
- Hawaii Natural Energy Institute, University of Hawai'i at Ma̅noa, Honolulu, Hawai'i 96822, United States
| | - Anh Tuan Nguyen
- Department of Mechanical Engineering, University of Hawai'i at Ma̅noa, Honolulu, Hawai'i 96822, United States
| | | | - Ding-Yuan Kuo
- Department of Chemistry, University of Washington, Seattle, Washington 98195, United States
| | - Brandi Cossairt
- Department of Chemistry, University of Washington, Seattle, Washington 98195, United States
| | - Woochul Lee
- Department of Mechanical Engineering, University of Hawai'i at Ma̅noa, Honolulu, Hawai'i 96822, United States
| | - Godwin Severa
- Hawaii Natural Energy Institute, University of Hawai'i at Ma̅noa, Honolulu, Hawai'i 96822, United States
| | - Joseph J Brown
- Department of Mechanical Engineering, University of Hawai'i at Ma̅noa, Honolulu, Hawai'i 96822, United States
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2
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Kuo DY, Nishiwaki E, Rivera-Maldonado RA, Cossairt BM. The Role of Hydrogen Adsorption Site Diversity in Catalysis on Transition-Metal Phosphide Surfaces. ACS Catal 2022. [DOI: 10.1021/acscatal.2c04936] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Ding-Yuan Kuo
- Department of Chemistry, University of Washington, Seattle, Washington 98195, United States
| | - Emily Nishiwaki
- Department of Chemistry, University of Washington, Seattle, Washington 98195, United States
| | | | - Brandi M. Cossairt
- Department of Chemistry, University of Washington, Seattle, Washington 98195, United States
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3
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Abstract
Measuring and modulating charge-transfer processes at quantum dot interfaces are crucial steps in developing quantum dots as photocatalysts. In this work, cyclic voltammetry under illumination is demonstrated to measure the rate of photoinduced charge transfer from CdS quantum dots by directly probing the changing oxidation states of a library of molecular charge acceptors, including both hole and electron acceptors. The voltammetry data demonstrate the presence of long-lived charge donor states generated by native photodoping of the quantum dots as well as a positive correlation between driving force and rate of charge transfer. Changes to the voltammograms under illumination follow mechanistic predictions from the ErCi' zone diagram, and electrochemical modeling allows for measurement of the rate of productive electron transfer. Observed rates for photoinduced charge transfer are on the order of 0.1 s-1, which are distinct from the picosecond dynamics measured by conventional transient optical spectroscopy methods and are more closely connected to the quantum yield of light-mediated chemical transformations.
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Affiliation(s)
- Micaela K Homer
- Department of Chemistry, University of Washington, Box 351700, Seattle, Washington 98195-1700, United States
| | - Ding-Yuan Kuo
- Department of Chemistry, University of Washington, Box 351700, Seattle, Washington 98195-1700, United States
| | - Florence Y Dou
- Department of Chemistry, University of Washington, Box 351700, Seattle, Washington 98195-1700, United States
| | - Brandi M Cossairt
- Department of Chemistry, University of Washington, Box 351700, Seattle, Washington 98195-1700, United States
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4
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Kuo DY, Lu X, Hu B, Abruña HD, Suntivich J. Rate and Mechanism of Electrochemical Formation of Surface-Bound Hydrogen on Pt(111) Single Crystals. J Phys Chem Lett 2022; 13:6383-6390. [PMID: 35797962 DOI: 10.1021/acs.jpclett.2c01734] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The formation of surface-bound hydrogen from one proton and one electron plays an enabling role in renewable hydrogen production. Quantifying the surface-bound hydrogen formation, however, requires decoupling the delicate interplay of numerous processes. We study cyclic voltammetry (CV) at fast scan rates to characterize the rate constant for the surface-bound hydrogen formation (also known as underpotential deposition hydrogen, UPD Had). We find that the formation of Had on Pt(111) single crystals is ∼100× faster in acid than in base. Reaction-order analysis indicates that the formation of Had occurs as a standard proton-coupled electron transfer (PCET) reaction in acid, whereas in base, it displays a pH-independent rate constant, indicating the presence of a chemical step such as the reorganization of interfacial water. Our results provide a methodology for quantifying the interfacial PCET kinetics and reveal the mechanistic nature of the UPD Had formation as the reason the hydrogen evolution electrocatalysis on Pt is faster in acid than in base.
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Affiliation(s)
- Ding-Yuan Kuo
- Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, United States
| | - Xinyao Lu
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, United States
| | - Bintao Hu
- Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, United States
| | - Héctor D Abruña
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, United States
- Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, New York 14853, United States
| | - Jin Suntivich
- Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, United States
- Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, New York 14853, United States
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5
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Abstract
In the development of next-generation electronics and energy devices, intercalation compounds of transition metal dichalcogenides (TMDCs) are gaining attention for their unique properties that result from synergistic interactions between guest species and host materials. Nowadays, intercalation compounds of MoS2 and WS2 are commonly prepared by a two-step process: (1) exfoliation to form single-layer and/or few-layer nanosheets and (2) restacking the nanosheets with the guest species by vigorously mixing the exfoliated suspension with the solution of guest species. While a wide variety of intercalation compounds have been synthesized using this approach, the intercalation process is often time-consuming, and the product slurry limits material quality and impedes characterization and applications. Herein, we report a versatile method for preparing intercalated TMDCs in a thin-film morphology. Using this approach, we successfully prepared a range of existing intercalation compounds of MoS2 and WS2 (e.g., ferrocene and amine intercalated MoS2 and WS2). Additionally, by leveraging the versatility of this intercalation method, we intercalated phenazine and benzoquinone into MoS2 and WS2 for the first time.
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Affiliation(s)
- Ding-Yuan Kuo
- Department of Chemistry, University of Washington, Seattle, WA 98195, USA.
| | - Brandi M Cossairt
- Department of Chemistry, University of Washington, Seattle, WA 98195, USA.
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6
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Wan G, Freeland JW, Kloppenburg J, Petretto G, Nelson JN, Kuo DY, Sun CJ, Wen J, Diulus JT, Herman GS, Dong Y, Kou R, Sun J, Chen S, Shen KM, Schlom DG, Rignanese GM, Hautier G, Fong DD, Feng Z, Zhou H, Suntivich J. Amorphization mechanism of SrIrO 3 electrocatalyst: How oxygen redox initiates ionic diffusion and structural reorganization. Sci Adv 2021; 7:eabc7323. [PMID: 33523986 PMCID: PMC7793586 DOI: 10.1126/sciadv.abc7323] [Citation(s) in RCA: 50] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Accepted: 11/18/2020] [Indexed: 05/19/2023]
Abstract
The use of renewable electricity to prepare materials and fuels from abundant molecules offers a tantalizing opportunity to address concerns over energy and materials sustainability. The oxygen evolution reaction (OER) is integral to nearly all material and fuel electrosyntheses. However, very little is known about the structural evolution of the OER electrocatalyst, especially the amorphous layer that forms from the crystalline structure. Here, we investigate the interfacial transformation of the SrIrO3 OER electrocatalyst. The SrIrO3 amorphization is initiated by the lattice oxygen redox, a step that allows Sr2+ to diffuse and O2- to reorganize the SrIrO3 structure. This activation turns SrIrO3 into a highly disordered Ir octahedral network with Ir square-planar motif. The final Sr y IrO x exhibits a greater degree of disorder than IrO x made from other processing methods. Our results demonstrate that the structural reorganization facilitated by coupled ionic diffusions is essential to the disordered structure of the SrIrO3 electrocatalyst.
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Affiliation(s)
- Gang Wan
- Materials Science Division, Argonne National Laboratory, Lemont, IL 60439, USA
| | - John W Freeland
- X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Lemont, IL 60439, USA
| | - Jan Kloppenburg
- Institute of Condensed Matter and Nanosciences, Université Catholique de Louvain, Chemin des Étoiles 8, B-1348 Louvain-la-Neuve, Belgium
| | - Guido Petretto
- Institute of Condensed Matter and Nanosciences, Université Catholique de Louvain, Chemin des Étoiles 8, B-1348 Louvain-la-Neuve, Belgium
| | - Jocienne N Nelson
- Laboratory of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, NY 14853, USA
| | - Ding-Yuan Kuo
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY 14853, USA
| | - Cheng-Jun Sun
- X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Lemont, IL 60439, USA
| | - Jianguo Wen
- Center for Nanoscale Materials, Argonne National Laboratory, Lemont, IL 60439, USA
| | - J Trey Diulus
- School of Chemical, Biological, and Environmental Engineering, Oregon State University, Corvallis, OR 97331, USA
| | - Gregory S Herman
- School of Chemical, Biological, and Environmental Engineering, Oregon State University, Corvallis, OR 97331, USA
| | - Yongqi Dong
- Materials Science Division, Argonne National Laboratory, Lemont, IL 60439, USA
- X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Lemont, IL 60439, USA
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Ronghui Kou
- X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Lemont, IL 60439, USA
| | - Jingying Sun
- Department of Physics and the Texas Center for Superconductivity, University of Houston, Houston, TX 77204, USA
| | - Shuo Chen
- Department of Physics and the Texas Center for Superconductivity, University of Houston, Houston, TX 77204, USA
| | - Kyle M Shen
- Laboratory of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, NY 14853, USA
- Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, NY 14853, USA
| | - Darrell G Schlom
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY 14853, USA
- Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, NY 14853, USA
- Leibniz-Institut für Kristallzüchtung, Max-Born-Str. 2, 12489 Berlin, Germany
| | - Gian-Marco Rignanese
- Institute of Condensed Matter and Nanosciences, Université Catholique de Louvain, Chemin des Étoiles 8, B-1348 Louvain-la-Neuve, Belgium
| | - Geoffroy Hautier
- Institute of Condensed Matter and Nanosciences, Université Catholique de Louvain, Chemin des Étoiles 8, B-1348 Louvain-la-Neuve, Belgium
| | - Dillon D Fong
- Materials Science Division, Argonne National Laboratory, Lemont, IL 60439, USA.
| | - Zhenxing Feng
- School of Chemical, Biological, and Environmental Engineering, Oregon State University, Corvallis, OR 97331, USA.
| | - Hua Zhou
- X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Lemont, IL 60439, USA.
| | - Jin Suntivich
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY 14853, USA.
- Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, NY 14853, USA
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7
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Hu B, Kuo DY, Paik H, Schlom DG, Suntivich J. Enthalpy and entropy of oxygen electroadsorption on RuO 2(110) in alkaline media. J Chem Phys 2020; 152:094704. [PMID: 33480745 DOI: 10.1063/1.5139049] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We report the temperature influence of the OHad and Oad electroadsorption on RuO2(110) films grown on TiO2(110) crystals in alkaline media. From the temperature effect, we evaluate the enthalpy and entropy of the OHad and Oad electroadsorption, including the adsorbate-adsorbate interactions that we analyze using the interaction parameters of the Frumkin-isotherm model. We found that the adsorbates repel each other enthalpically but attract each other entropically. Our result suggests that an entropy analysis is necessary to capture the electroadsorption behavior on RuO2 since the enthalpy-entropy competition strongly influences the electroadsorption behavior. Our observation of an entropic force is consistent with the view that water may be a mediator for adsorbate-adsorbate interactions.
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Affiliation(s)
- Bintao Hu
- Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, USA
| | - Ding-Yuan Kuo
- Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, USA
| | - Hanjong Paik
- Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, USA
| | - Darrell G Schlom
- Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, USA
| | - Jin Suntivich
- Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, USA
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8
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Kuo DY, Paik H, Nelson JN, Shen KM, Schlom DG, Suntivich J. Chlorine evolution reaction electrocatalysis on RuO2(110) and IrO2(110) grown using molecular-beam epitaxy. J Chem Phys 2019; 150:041726. [DOI: 10.1063/1.5051429] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Ding-Yuan Kuo
- Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, USA
| | - Hanjong Paik
- Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, USA
| | - Jocienne N. Nelson
- Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, New York 14853, USA
| | - Kyle M. Shen
- Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, New York 14853, USA
- Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, New York 14853, USA
| | - Darrell G. Schlom
- Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, USA
- Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, New York 14853, USA
| | - Jin Suntivich
- Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, USA
- Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, New York 14853, USA
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9
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Kuo DY, Paik H, Kloppenburg J, Faeth B, Shen KM, Schlom DG, Hautier G, Suntivich J. Measurements of Oxygen Electroadsorption Energies and Oxygen Evolution Reaction on RuO 2(110): A Discussion of the Sabatier Principle and Its Role in Electrocatalysis. J Am Chem Soc 2018; 140:17597-17605. [PMID: 30463402 DOI: 10.1021/jacs.8b09657] [Citation(s) in RCA: 83] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
We report the hydroxide (OHad) and oxide (Oad) experimental electroadsorption free energies, their dependences on pH, and their correlations to the oxygen evolution reaction (OER) electrocatalysis on RuO2(110) surface. The Sabatier principle predicts that catalyst is most active when the intermediate stabilization is moderate, not too strong such that the bound intermediate disrupts the subsequent catalytic cycle, nor too weak such that the surface is ineffective. For decades, researchers have used this concept to rationalize the activity trend of many OER electrocatalysts including RuO2, which is among the state-of-the-art OER catalysts. In this article, we report an experimental assessment of the Sabatier principle by comparing the oxygen electroadsorption energy to the OER electrocatalysis for the first time on RuO2. We find that the OHad and Oad electroadsorption energies on RuO2(110) depend on pH and obey the scaling relation. However, we did not observe a direct correlation between the OHad and Oad electroadsorption energies and the OER activity in the comparative analysis that includes both RuO2(110) and IrO2(110). Our result raises a question of whether the Sabatier principle can describe highly active electrocatalysts, where the kinetic aspects may influence the electrocatalysis more strongly than the electroadsorption energy, which captures only the thermodynamics of the intermediates and not yet kinetics.
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Affiliation(s)
- Ding-Yuan Kuo
- Department of Materials Science and Engineering , Cornell University , Ithaca , New York 14853 , United States
| | - Hanjong Paik
- Department of Materials Science and Engineering , Cornell University , Ithaca , New York 14853 , United States
| | - Jan Kloppenburg
- Institute of Condensed Matter and Nanosciences (IMCN) , Université Catholique de Louvain , Louvain-la-Neuve 1348 , Belgium
| | - Brendan Faeth
- Department of Physics, Laboratory of Atomic and Solid State Physics , Cornell University , Ithaca , New York 14853 , United States
| | - Kyle M Shen
- Department of Physics, Laboratory of Atomic and Solid State Physics , Cornell University , Ithaca , New York 14853 , United States.,Kavli Institute at Cornell for Nanoscale Science , Cornell University , Ithaca , New York 14853 , United States
| | - Darrell G Schlom
- Department of Materials Science and Engineering , Cornell University , Ithaca , New York 14853 , United States.,Kavli Institute at Cornell for Nanoscale Science , Cornell University , Ithaca , New York 14853 , United States
| | - Geoffroy Hautier
- Institute of Condensed Matter and Nanosciences (IMCN) , Université Catholique de Louvain , Louvain-la-Neuve 1348 , Belgium
| | - Jin Suntivich
- Department of Materials Science and Engineering , Cornell University , Ithaca , New York 14853 , United States.,Kavli Institute at Cornell for Nanoscale Science , Cornell University , Ithaca , New York 14853 , United States
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10
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Eom CJ, Kuo DY, Adamo C, Moon EJ, May SJ, Crumlin EJ, Schlom DG, Suntivich J. Tailoring manganese oxide with atomic precision to increase surface site availability for oxygen reduction catalysis. Nat Commun 2018; 9:4034. [PMID: 30279490 PMCID: PMC6168596 DOI: 10.1038/s41467-018-06503-8] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2018] [Accepted: 09/07/2018] [Indexed: 11/30/2022] Open
Abstract
Controlling the structure of catalysts at the atomic level provides an opportunity to establish detailed understanding of the catalytic form-to-function and realize new, non-equilibrium catalytic structures. Here, advanced thin-film deposition is used to control the atomic structure of La2/3Sr1/3MnO3, a well-known catalyst for the oxygen reduction reaction. The surface and sub-surface is customized, whereas the overall composition and d-electron configuration of the oxide is kept constant. Although the addition of SrMnO3 benefits the oxygen reduction reaction via electronic structure and conductivity improvements, SrMnO3 can react with ambient air to reduce the surface site availability. Placing SrMnO3 in the sub-surface underneath a LaMnO3 overlayer allows the catalyst to maintain the surface site availability while benefiting from improved electronic effects. The results show the promise of advanced thin-film deposition for realizing atomically precise catalysts, in which the surface and sub-surface structure and stoichiometry are tailored for functionality, over controlling only bulk compositions. Controlling structures at the atomic level provides an opportunity to design and understand catalysts. Here the authors use thin-film deposition to fabricate perovskite heterostructures in a non-equilibrium manner to assess the effects on electrocatalytic activity for oxygen reduction.
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Affiliation(s)
- C John Eom
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY, 14853, USA
| | - Ding-Yuan Kuo
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY, 14853, USA
| | - Carolina Adamo
- Department of Applied Physics, Stanford University, Stanford, CA, 94305, USA
| | - Eun Ju Moon
- Department of Materials Science and Engineering, Drexel University, Philadelphia, PA, 19104, USA
| | - Steve J May
- Department of Materials Science and Engineering, Drexel University, Philadelphia, PA, 19104, USA
| | - Ethan J Crumlin
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Darrell G Schlom
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY, 14853, USA.,Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, NY, 14853, USA
| | - Jin Suntivich
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY, 14853, USA. .,Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, NY, 14853, USA.
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11
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Kuo DY, Kawasaki JK, Nelson JN, Kloppenburg J, Hautier G, Shen KM, Schlom DG, Suntivich J. Influence of Surface Adsorption on the Oxygen Evolution Reaction on IrO2(110). J Am Chem Soc 2017; 139:3473-3479. [DOI: 10.1021/jacs.6b11932] [Citation(s) in RCA: 216] [Impact Index Per Article: 30.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Ding-Yuan Kuo
- Department
of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, United States
| | - Jason K. Kawasaki
- Laboratory
of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, New York 14853, United States
- Kavli Institute at Cornell for Nanoscale Science, Ithaca, New York 14853, United States
| | - Jocienne N. Nelson
- Laboratory
of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, New York 14853, United States
| | - Jan Kloppenburg
- Institute
of Condensed Matter and Nanosciences (ICMN), Université catholique de Louvain, Louvain-la-Neuve 1348, Belgium
| | - Geoffroy Hautier
- Institute
of Condensed Matter and Nanosciences (ICMN), Université catholique de Louvain, Louvain-la-Neuve 1348, Belgium
| | - Kyle M. Shen
- Laboratory
of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, New York 14853, United States
- Kavli Institute at Cornell for Nanoscale Science, Ithaca, New York 14853, United States
| | - Darrell G. Schlom
- Department
of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, United States
- Kavli Institute at Cornell for Nanoscale Science, Ithaca, New York 14853, United States
| | - Jin Suntivich
- Department
of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, United States
- Kavli Institute at Cornell for Nanoscale Science, Ithaca, New York 14853, United States
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12
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Chu YH, Liao HY, Lin KY, Chang HY, Kao WL, Kuo DY, You YW, Chu KJ, Wu CY, Shyue JJ. Improvement of the gas cluster ion beam-(GCIB)-based molecular secondary ion mass spectroscopy (SIMS) depth profile with O2(+) cosputtering. Analyst 2016; 141:2523-33. [PMID: 27000483 DOI: 10.1039/c5an02677f] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Over the last decade, cluster ion beams have displayed their capability to analyze organic materials and biological specimens. Compared with atomic ion beams, cluster ion beams non-linearly enhance the sputter yield, suppress damage accumulation and generate high mass fragments during sputtering. These properties allow successful Secondary Ion Mass Spectroscopy (SIMS) analysis of soft materials beyond the static limit. Because the intensity of high mass molecular ions is intrinsically low, enhancing the intensity of these secondary ions while preserving the sample in its original state is the key to highly sensitive molecular depth profiles. In this work, bulk poly(ethylene terephthalate) (PET) was used as a model material and analyzed using Time-of-Flight SIMS (ToF-SIMS) with a pulsed Bi3(2+) primary ion. The optimized hardware of a 10 kV Ar2500(+) Gas Cluster Ion Beam (GCIB) with a low kinetic energy (200-500 V) oxygen ion (O2(+)) as a cosputter beam was employed for generating depth profiles and for examining the effect of beam parameters. The results were then quantitatively analyzed using an established erosion model. It was found that the ion intensity of the PET monomer ([M + H](+)) and its large molecular fragment ([M - C2H4O + H](+)) steadily declined during single GCIB sputtering, with distortion of the distribution information. However, under an optimized GCIB-O2(+) cosputter, the secondary ion intensity quickly reached a steady state and retained >95% intensity with respect to the pristine surface, although the damage cross-section was larger than that of single GCIB sputtering. This improvement was due to the oxidation of molecules and the formation of -OH groups that serve as proton donors to particles emitted from the surface. As a result, the ionization yield was enhanced and damage to the chemical structure was masked. Although O2(+) is known to alter the chemical structure and cause damage accumulation, the concurrently used GCIB could sufficiently remove the surface layer and allow the damage to be masked by the enhanced ionization yield when the ion-solid interaction volume was kept shallow with a low O2(+) energy. This low O2(+) energy (200 V) cosputtering also produced a smoother surface than a single GCIB. Because the oxidized species were produced by O2(+) and removed by GCIB simultaneously, a sufficiently high O2(+) current density was required to produce adequate enhancements. Therefore, it was found that 10 kV with 2 × 10(-6) A per cm(2) Ar2500(+) and 200 V with 3.2 × 10(-4) A per cm(2) O2(+) produced the best profile.
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Affiliation(s)
- Yi-Hsuan Chu
- Department of Materials Science and Engineering, National Taiwan University, Taipei, Taiwan.
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13
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Liao HY, Tsai MH, Kao WL, Kuo DY, Shyue JJ. Effects of the temperature and beam parameters on depth profiles in X-ray photoelectron spectrometry and secondary ion mass spectrometry under C60+–Ar+ cosputtering. Anal Chim Acta 2014; 852:129-36. [DOI: 10.1016/j.aca.2014.08.044] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2014] [Revised: 08/20/2014] [Accepted: 08/21/2014] [Indexed: 10/24/2022]
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14
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Lin JH, Chang HY, Kao WL, Lin KY, Liao HY, You YW, Kuo YT, Kuo DY, Chu KJ, Chu YH, Shyue JJ. Effect of surface potential on extracellular matrix protein adsorption. Langmuir 2014; 30:10328-35. [PMID: 25111830 DOI: 10.1021/la5020362] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Extracellular matrix (ECM) proteins, such as fibronectin, laminin, and collagen IV, play important roles in many cellular behaviors, including cell adhesion and spreading. Understanding their adsorption behavior on surfaces with different natures is helpful for studying the cellular responses to environments. By tailoring the chemical composition in binary acidic (anionic) and basic (cationic) functionalized self-assembled monolayer (SAM)-modified gold substrates, variable surface potentials can be generated. To examine how surface potential affects the interaction between ECM proteins and substrates, a quartz crystal microbalance with dissipation detection (QCM-D) was used. To study the interaction under physiological conditions, the ionic strength and pH were controlled using phosphate-buffered saline at 37 °C, and the ζ potentials of the SAM-modified Au and protein were determined using an electrokinetic analyzer and phase analysis light scattering, respectively. During adsorption processes, the shifts in resonant frequency (f) and energy dissipation (D) were acquired simultaneously, and the weight change was calculated using the Kelvin-Voigt model. The results reveal that slightly charged protein can be adsorbed on a highly charged SAM, even where both surfaces are negatively charged. This behavior is attributed to the highly charged SAM, which polarizes the protein microscopically, and the Debye interaction, as well as other short-range interactions such as steric force, hydrogen bonding, direct bonding, charged domains within the protein structure, etc., that allow adsorption, although the macroscopic electrostatic interaction discourages adsorption. For surfaces with a moderate potential, proteins are not significantly polarized by the surface, and the interaction can be predicted through simple electrostatic attraction. Furthermore, surface-induced self-assembly of protein molecules also affects the adsorbed structures and kinetics. The adsorbed layer properties, such as rigidity and packing behaviors, were further investigated using the D-f plot and phase detection microscopy (PDM) imaging.
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Affiliation(s)
- Jiun-Hao Lin
- Department of Materials Science and Engineering, National Taiwan University , Taipei 106, Taiwan
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15
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Kao WL, Chang HY, Yen GJ, Kuo DY, You YW, Huang CC, Kuo YT, Lin JH, Shyue JJ. Adsorption behavior of plasmid DNA on binary self-assembled monolayers modified gold substrates. J Colloid Interface Sci 2012; 382:97-104. [DOI: 10.1016/j.jcis.2012.06.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2012] [Revised: 05/31/2012] [Accepted: 06/01/2012] [Indexed: 11/25/2022]
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16
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Lee SH, Lin WC, Chang CJ, Huang CC, Liu CP, Kuo CH, Chang HY, You YW, Kao WL, Yen GJ, Kuo DY, Kuo YT, Tsai MH, Shyue JJ. Effect of the chemical composition on the work function of gold substrates modified by binary self-assembled monolayers. Phys Chem Chem Phys 2011; 13:4335-9. [DOI: 10.1039/c0cp02437f] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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17
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Parikh SK, Ravi A, Kuo DY, Nori D. Bullous pemphigoid masquerading as acute radiation dermatitis: case report. EUR J GYNAECOL ONCOL 2002; 22:322-4. [PMID: 11766730] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
We report the first case of bullous pemphigoid complicating radiation therapy for vulvar cancer. Shortly after completion of postoperative radiation therapy for a TIN1 vulvar carcinoma, the patient presented with a rash that started within, but continued to extend, well beyond the radiation field. A biopsy of the lesions confirmed the diagnosis of bullous pemphigoid, and she had prompt clinical resolution with systemic tetracycline and steroids.
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Affiliation(s)
- S K Parikh
- Weill Medical College of Cornell University, New York, USA
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18
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Abstract
Neuropeptide Y (NPY), an orexigenic peptide, is involved in the control of food intake. Repeated administration of amphetamine (AMPH), an anorectic agent, results in an anorectic effect on day 1 and a tolerant anorectic effect on the followings. In an attempt to know the role of hypothalamic NPY in these effects of AMPH, contents of hypothalamic NPY were determined by radioimmunoassay at first. In AMPH-treated groups, the contents of hypothalamic NPY decreased rapidly on day 1 but restored gradually to the normal level on the following days as observed in repeated AMPH. An involvement of hypothalamic NPY in the feeding change of repeated AMPH can thus be considered. Moreover, daily injection of NPY antisense oligonucleotide into brain (10 microg/10 microl/day, i.c.v.) to inhibit the gene expression of hypothalamic NPY were performed at 1 hour before daily 2 mg/kg AMPH. The reversion of food intake from the anorectic level to the normal level (tolerant anorexia) was abolished by this antisense pretreatment. It is suggested that hypothalamic NPY may play a role in the change of feeding behavior induced by repeated AMPH administration.
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Affiliation(s)
- D Y Kuo
- Department of Pharmacology, College of Medicine, National Cheng Kung University, Tainan City, Taiwan, ROC
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19
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Chen TY, Duh SL, Huang CC, Lin TB, Kuo DY. Evidence for the involvement of dopamine D(1) and D(2) receptors in mediating the decrease of food intake during repeated treatment with amphetamine. J Biomed Sci 2001; 8:462-6. [PMID: 11702009 DOI: 10.1007/bf02256608] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
Repeated treatment with amphetamine (AMPH), a well-known anorectic agent, into animals could induce anorexia on day 1 and produce a gradual reversion of food intake (tolerant anorexia) on the following days. It is unknown whether these feeding changes are related to dopamine (DA) and/or noradrenergic neurotransmission. Thus, the present study investigated the subtype of receptor mediating AMPH-induced anorexia. Daily food intake was measured after various drugs were given. Pretreatment with haloperidol, an antagonist of DA receptors, may lead to inhibition of AMPH-induced anorexia. However, pretreatment with the alpha-adrenoceptor antagonist phentolamine, and the beta-adrenoceptor antagonist propranolol, failed to modify the action of AMPH, suggesting the involvement of DA receptors but not adrenoceptors in the action of AMPH-induced anorexia. Furthermore, pretreatment with SCH 23390 at a dose sufficient to block D(1) receptors or pimozide at a dose sufficient to inhibit D(2) receptors blocked AMPH-induced anorexia, indicating the involvement of D(1) and D(2) receptors. In a study of tolerant anorexia, repeated treatment with the D(1)/D(2) agonist apomorphine, but not the D(1) agonist SKF 38393 or D(2) agonist quinpirole, induced an AMPH-like tolerant feeding response, providing evidence for conjoint action of D(1) and D(2) receptors in the effect. The present results suggest that both D(1) and D(2) receptors are involved in anorexia and tolerant anorexia induced by chronic intermittent administration of AMPH.
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Affiliation(s)
- T Y Chen
- Department of Internal Medicine, Chung-Shan Medical and Dental College, Taichung, Taiwan, ROC
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20
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Abstract
We present a case of Stage I ovarian carcinoid tumor recurrent in the peritoneal cavity and review the pertinent literature concerning the management of this disease. Based on the data in the gynecologic and general surgery literature, it appears that primary complete cytoreductive surgery usually affords a high cure rate. Reexploration and attempt at complete resection of this slow-growing tumor appears to provide significant and prolonged palliation and is indicated for recurrent disease.
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Affiliation(s)
- P F Timmins
- Division of Gynecologic Oncology, Albert Einstein College of Medicine and Montefiore Medical Center, Bronx, New York, 10461, USA
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Kuo DY, Lin TB, Huang CC, Duh SL, Liao JM, Cheng JT. Nicotine-induced hyperlocomotion is not modified by the estrous cycle, ovariectomy and estradiol replacement at physiological level. CHINESE J PHYSIOL 1999; 42:83-8. [PMID: 10513603] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/14/2023] Open
Abstract
The present study was designed to investigate whether nicotine's effect on locomotion might be modulated by the ovarian hormone at physiological level. Rats at normal cycling of estrus and diestrus were selected for the comparison of nicotine-induced hyperlocomotion based on the document that the release of striatal dopamine was greatest at the estrous phase. Ovariectomized rats primed with or without estrogen at physiological level were also selected for comparison. Increase in spontaneous locomotion by nicotine was statistically significant at the doses of 0.15 and 0.3 mg/kg (p < 0.001). The stimulating effect of nicotine led the locomotor response to almost the same magnitude in all hormonal groups studied. Nicotine-induced hyperlocomotion appeared to be mediated by central nicotinic receptor because it was blocked by mecamylamine (0.5 and 1.0 mg/kg, i.p.). Also it was blocked by haloperidol (0.04 and 0.08 mg/kg, i.p.) indicating the involvement of dopaminergic neurotransmission. These effects were similar in all groups regardless of the estrous cycle or ovariectomy. The observed data provided behavioral evidence to suggest that the effect of nicotine on locomotion-related dopaminergic neurons might not be modified by the physiological action of estrogen.
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Affiliation(s)
- D Y Kuo
- Department of Physiology, Chung-Shan Medical and Dental College, Taichung, Taiwan, ROC
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22
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Kuo DY, Liu CN, Tsay JC, Chang CL, Cheng JT. Effects of nicotine on spontaneous and amphetamine-induced motor behaviors: the differences between nicotine tolerant and nontolerant rats. CHINESE J PHYSIOL 1998; 41:93-9. [PMID: 9801839] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023] Open
Abstract
This study was designed to investigate the effect of nicotine on spontaneous and amphetamine (AMP)-induced motor activity in rats with or without tolerance to nicotine. Tolerance were induced by treating the rats with nicotine (0.3 mg/kg, s.c.) 2 hr before receiving challenge doses. Motor activity including locomotion and stereotypy was monitored automatically by videocamera every 15 min for 90 min. The results indicated that: (1) Nicotine increased spontaneous locomotion at 0.15 or 0.3 mg/kg (s.c.) in naive rats and at 0.6 mg/kg in tolerant rats. Nicotine also slightly affected AMP-induced locomotion at 0.15, 0.3 or 0.6 mg/kg in both naive and tolerant rats, and (2) Nicotine increased spontaneous stereotypy at 0.3 or 0.6 mg/kg in naive rats only and showed no effect on AMP-induced stereotypy in either naive or tolerant rats. Comparing the results of spontaneous motor activity between naive and tolerant rats, it revealed behavioral desensitization in locomotion at low doses (0.15 or 0.3 mg/kg) and hyperlocomotion at higher dose (0.6 mg/kg), and revealed desensitization in stereotypy at 0.3 or 0.6 mg/kg. Moreover, nicotine had temporary (at 0-15 min interval) attenuating effect on AMP-induced locomotion in naive rats but showed a potentiating effect on AMP-induced locomotion in tolerant rats. The present results indicated that acute tolerance modified the action of nicotine in both spontaneous and AMP-induced locomotion, while stereotypy was changed only in the spontaneous one but not in the AMP-induced one. In other words, acute tolerance modified the effect of nicotine on locomotion-related dopaminergic system, and it affected the stereotypy-related dopaminergic system only in the spontaneous one but not in the AMP-induced one.
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Affiliation(s)
- D Y Kuo
- Department of Physiology, Chung-Shan Medical and Dental College, Taichung, Taiwan, ROC
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23
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Cass I, Kuo DY, Fields AL, Runowicz CD, Goldberg GL. Profound thrombocytopenia in previously treated patients with recurrent ovarian carcinoma receiving topotecan. Gynecol Oncol 1998; 69:175-8. [PMID: 9600828 DOI: 10.1006/gyno.1998.4966] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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24
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Kuo DY, Jones J, Fields AL, Runowicz CD, Goldberg GL. Endometrioid adenocarcinoma of the ovary and long-term tamoxifen therapy: a coincidence or a cause for concern? EUR J GYNAECOL ONCOL 1998; 18:457-60. [PMID: 9443009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
In recent years, the extensive usage of tamoxifen in patients with breast cancer has led us to acquire a great deal of knowledge of its effects on various organs in the gynecological system, especially the effect on the endometrium and the increased risk of endometrial cancer. Information on the possible potential carcinogenic effect of tamoxifen on the ovary, however, has been limited, mainly because of the overall low incidence of ovarian carcinoma. In addition, there is the confounding variable posed by the diverse here-ditary breast and ovarian cancer syndromes which tend to occur in a younger age group. Here, we present a case of a postmenopausal woman who was treated for six years with tamoxifen for breast cancer before being diagnosed with endometrioid carcinoma of the ovary. We believe that given the age of the patient and the duration of tamoxifen use, the occurrence of ovarian endometrioid carcinoma may be associated with long-term tamoxifen use.
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Affiliation(s)
- D Y Kuo
- Department of Obstetrics and Gynecology, Albert Einstein College of Medicine, Bronx, NY, USA
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Kavallaris M, Kuo DY, Burkhart CA, Regl DL, Norris MD, Haber M, Horwitz SB. Taxol-resistant epithelial ovarian tumors are associated with altered expression of specific beta-tubulin isotypes. J Clin Invest 1997; 100:1282-93. [PMID: 9276747 PMCID: PMC508306 DOI: 10.1172/jci119642] [Citation(s) in RCA: 450] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
The treatment of advanced ovarian cancer with taxol is hindered by the development of drug resistance. The cellular target for taxol is the microtubule that is stabilized by the drug. Taxol preferentially binds to the beta subunit of tubulin of which there are six distinct isotypes in mammalian cells. We have used highly specific oligonucleotides and polymerase chain reaction to analyze expression of all six beta-tubulin genes. Human lung cancer cells (A549) were selected in 12 and 24 nM taxol resulting in cell lines that were 9- and 17-fold resistant, respectively. These cells displayed an altered ratio of classes I, II, III, and IVa beta-tubulin isotypes. Ovarian tumors, seven untreated primary and four taxol- resistant tumor-bearing ascites, displayed significant increases (P < 0.005) in classes I (3.6-fold), III (4.4-fold), and IVa (7.6-fold) isotypes in the taxol-resistant samples as compared with untreated primary ovarian tumors. The increased expression appears to be related to the resistance phenotype, as the basal levels of the class III and IVa isotypes in the untreated tumors were extremely low. This is the first report of altered expression of specific beta-tubulin genes in taxol-resistant ovarian tumors and we propose that the latter may play a role in clinical resistance to taxol.
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Affiliation(s)
- M Kavallaris
- Department of Molecular Pharmacology, Division of Gynecological Oncology, Albert Einstein College of Medicine and Montefiore Medical Center, Bronx, New York 10461, USA
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Kuo DY, Mallick S, Shen HJ, DeVictoria C, Jones J, Fields AL, Goldberg GL, Runowicz CD, Horwitz SB. Analysis of MDR1 expression in normal and malignant endometrium by reverse transcription-polymerase chain reaction and immunohistochemistry. Clin Cancer Res 1996; 2:1981-92. [PMID: 9816157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
The purpose of this study was to quantitate the expression of human MDR1 mRNA levels in normal endometrium and in endometrial carcinoma and to determine the association of MDR1 levels with prognostic indicators. Endometrial samples from 43 postmenopausal patients with endometrial carcinoma and 38 patients (controls) with benign disease undergoing hysterectomy were snap-frozen. MDR1 levels were determined by quantitative reverse transcription-PCR (RT-PCR) and compared to sensitive and resistant cell lines. Immunohistochemistry was done with MM4.17, an anti-MDR1 antibody, on paraffin sections, and the results were compared to those obtained from RT-PCR. Data was analyzed using the Kruskal-Wallis and Bonferroni tests, setting the P value at 0.05. In both postmenopausal endometrial tissue and tumors, MDR1 expression was localized to the epithelial cell layer. Comparison of immunohistochemistry and RT-PCR results demonstrated a correlation of 80%. In control patients, MDR1 expression was significantly higher in postmenopausal endometrium (n = 15) than in the proliferative premenopausal endometrium (n = 15; P = 0.0024). MDR1 expression in all tumors was lower than that measured in the postmenopausal controls. Between each tumor group, there was no significant difference in the MDR1 levels observed. MDR1 expression was significantly lower in patients with high nuclear grade (n = 18) tumors when compared to patients with low nuclear grade (n = 14; P = 0.04) tumors. Comparison of MDR1 levels with multiple prognostic indicators for endometrial cancer was only significant for nuclear grade. The data indicate that MDR1 expression is not a major component of the drug resistance observed in primary endometrial tumors.
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Affiliation(s)
- D Y Kuo
- Departments of Obstetrics and Gynecology, Division of Gynecological Oncology, Albert Einstein College of Medicine, Bronx, New York 10461, USA
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Abstract
Tamoxifen, an estrogen antagonist, is widely used as adjuvant therapy in patients with breast cancer. Its efficacy in increasing survival and reducing recurrence rates has been demonstrated in several European and American studies. However, its effects appear to be tissue specific. Tamoxifen exerts an estrogen effect (agonist) on the endometrium, myometrium and vagina. An increase in uterine cancer has been confirmed in several placebo-controlled clinical trials. Due to the widespread use of this drug, it is timely to review the gynecologic effects of tamoxifen.
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Affiliation(s)
- D Y Kuo
- Department of Obstetrics and Gynecology, Albert Einstein College of Medicine, Montefiore Medical Center, Bronx, NY, USA
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Smith HO, Anderson PS, Kuo DY, Goldberg GL, DeVictoria CL, Boocock CA, Jones JG, Runowicz CD, Stanley ER, Pollard JW. The role of colony-stimulating factor 1 and its receptor in the etiopathogenesis of endometrial adenocarcinoma. Clin Cancer Res 1995; 1:313-25. [PMID: 9815987] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
Colony-stimulating factor 1 (CSF-1) is a homodimeric growth factor that humorally regulates the growth and differentiation of mononuclear phagocytes, and locally regulates maternal-fetal interactions during pregnancy. It exerts these actions through a transmembrane tyrosine kinase receptor, colony-stimulating factor 1 receptor (CSF-1R), the product of the c-fms proto-oncogene. Recent studies have demonstrated overexpression of CSF-1 and its receptor in breast, ovarian, and endometrial adenocarcinomas. To further investigate the possible role of CSF-1 and its receptor in the pathogenesis of endometrial adenocarcinoma, a prospective study was undertaken to study CSF-1 expression in benign and neoplastic endometrial epithelium and to compare serum CSF-1 levels in endometrial adenocarcinoma patients with healthy perimenopausal women. The mean serum levels of CSF-1 in 71 patients with endometrial cancer (4.9 +/- 1.8 microgram/liter) were significantly elevated compared with levels found in the 32 controls (3.5 +/- 1.1 microgram/liter). Within the endometrial adenocarcinoma group, circulating CSF-1 levels were significantly elevated in patients with large tumor volume, high grade, myometrial invasion, residual disease, and circulating CA-125 levels. High serum levels of serum CSF-1 were associated with elevated serum CA19-9 and CA-125 levels. Immunohistochemistry results revealed in tumor epithelium intense staining for CSF-1R (27 of 54 cases, 50%) and elevated staining for CSF-1 (41 of 54 cases, 75.9%), with intense staining of CSF-1 in 16 of 54 cases (29.6%). Staining was significantly greater in intensity and number of cells involved in malignant compared with benign epithelium for CSF-1R and CSF-1 (P = 0.05 and <0.0001, respectively). A positive correlation between amount and intensity of CSF-1 and CSF-1R staining in endometrial adenocarcinoma tissue was also demonstrated (P = 0.007). CSF-1 and CSF-1R mRNA was also detected in the tumor samples, confirming the expression of the protein in these tissues. Reverse transcription-PCR demonstrated the presence of mRNA for both the transmembrane and secreted forms of CSF-1 in all tumors analyzed. These results therefore support the hypotheses that CSF-1 and CSF-1R are overexpressed in endometrial adenocarcinoma, that levels of expression significantly correlate with clinicopathological risk factors for poor outcome, and that CSF-1 in association with its receptor via autocrine, juxtacrine, and/or paracrine interactions has a causal role in endometrial adenocarcinoma development and proliferation.
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Affiliation(s)
- H O Smith
- Department of Obstetrics and Gynecology, Department of Developmental and Molecular Biology, and Department of Pathology, Albert Einstein College of Medicine and Montefiore Medical Center, Bronx, New York 10461, USA
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Kuo DY, Smith HO, Runowicz CD, Goldberg GL. Cecal cancer in a teenager presenting with a pelvic mass: a case report and review of the literature. Gynecol Oncol 1994; 55:149-51. [PMID: 7959257 DOI: 10.1006/gyno.1994.1265] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Colorectal cancer generally affects men and women in the later decades of life. Typically patients present with bowel obstruction and/or chronic anemia. The epidemiology, presentation, and prognosis of cecal carcinoma, the third most common colorectal cancer, is similar to other cancers of the large bowel. Cecal and other colorectal cancers rarely present in adolescence. In this case report, we describe a 19-year-old woman presenting with a pelvic mass and elevated tumor markers with the presumed diagnosis of ovarian cancer, who was found to have cecal carcinoma at laparotomy. This case illustrates that colorectal cancer, although rare, should be considered in the differential diagnosis of a pelvic mass in young women who present with anemia, constitutional symptoms, and elevated tumor markers.
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Affiliation(s)
- D Y Kuo
- Department of Obstetrics and Gynecology, Albert Einstein College of Medicine/Montefiore Medical Center, Bronx, New York 10461
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