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3. An antisite defect mechanism for room temperature ferroelectricity in orthoferrites

Author

Ning, Shuai, Kumar, Abinash, Klyukin, Konstantin, Kim, Jong Heon, Su, Tingyu, Kim, Hyun-Suk, LeBeau, James M., Yildiz, Bilge, and Ross, Caroline A.

Subjects
Condensed Matter - Materials Science
Abstract

Single-phase multiferroic materials that allow the coexistence of ferroelectric and magnetic ordering above room temperature are highly desirable, motivating an ongoing search for mechanisms for unconventional ferroelectricity in magnetic oxides. Here, we report an antisite defect mechanism for room temperature ferroelectricity in epitaxial thin films of yttrium orthoferrite, YFeO3, a perovskite-structured canted antiferromagnet. A combination of piezoresponse force microscopy, atomically resolved elemental mapping with aberration corrected scanning transmission electron microscopy and density functional theory calculations reveals that the presence of YFe antisite defects facilitates a non-centrosymmetric distortion promoting ferroelectricity. This mechanism is predicted to work analogously for other rare earth orthoferrites, with a dependence of the polarization on the radius of the rare earth cation. Furthermore, a vertically aligned nanocomposite consisting of pillars of a magnetoelastic oxide CoFe2O4 embedded epitaxially in the YFeO3 matrix exhibits both robust ferroelectricity and ferrimagnetism at room temperature, as well as a noticeable strain-mediated magnetoelectric coupling effect. Our work uncovers the distinctive role of antisite defects in providing a novel mechanism for ferroelectricity in a range of magnetic orthoferrites and further augments the functionality of this family of complex oxides for multiferroic applications.

Published
2021
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10. Ultrafast One‐Step Synthesis of Garnet‐Type Solid Electrolytes With Modified Surface and Microstructure for Solid‐State Lithium‐Metal Batteries.

Author

Kim, Jong Heon, Kim, Doosoo, Nanda, Siddhartha, and Khani, Hadi

Subjects
*SOLID electrolytes, *INTERFACIAL resistance, *IONIC conductivity, *SUPERIONIC conductors, *CRITICAL currents, *LITHIUM cells
Abstract

Garnet‐type Li6.5La3Zr1.5Ta0.5O12 (LLZTO) solid electrolytes provide the necessary electrochemical stability and ionic conductivity for solid‐state lithium‐metal batteries (SSLMBs). However, their wider application is hindered by their high interfacial resistance with electrodes and a lengthy synthesis process. This study presents the synthesis of densified LLZTO electrolytes using unconventional Li2O and Li2ZrO3 precursors through an ultrafast (≈60 s) Joule heat‐assisted synthesis approach in a single‐step process. The lower sintering temperature of Li2ZrO3 compared to traditional ZrO2 precursor yields LLZTO with larger grains, resulting in enhanced Li+ conductivity (7.0 × 10−4 S cm−1 at 25 °C), reduced electronic conductivity (1.7 × 10−10 S cm−1), and higher density (94.2%). Applying a 52–80 nm Sn:SnF2 coating on the LLZTO surface using a melt‐quenching approach produces a uniform interlayer that chemically converts to Li‐Sn alloy and LiF upon contact with lithium, resulting in a near‐zero interfacial resistance and a critical current density of 4.2 mA cm−2 at 25 °C. The SSLMBs, incorporating Sn:SnF2‐coated LLZTO electrolyte with NMC811 cathode, demonstrate remarkable initial capacity (181.1 mAh g−1) and cycle performance (88.63% capacity retention at 3000th cycle). The results indicate that this approach has the potential to advance the commercial fabrication technology for high‐performance solid electrolytes for SSLMBs. [ABSTRACT FROM AUTHOR]

Published
2024
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23. Extracellular Vesicles from Cerebrospinal Fluid of Leptomeningeal Metastasis Patients Deliver MiR-21 and Induce Methotrexate Resistance in Lung Cancer Cells.

Author

Im, Ji Hye, Lee, Kyue-Yim, Seo, Yoona, Rhim, Jiho, Dho, Yun-Sik, Yoo, Byong Chul, Park, Jong Bae, Shin, Sang Hoon, Yoo, Heon, Kim, Jong Heon, and Gwak, Ho-Shin

Subjects
VESICLES (Cytology), EXTRACELLULAR vesicles, MICRORNA, CEREBROSPINAL fluid, LUNG cancer, NON-small-cell lung carcinoma, LUNGS
Abstract

Leptomeningeal metastasis (LM) is a common and fatal complication of advanced non-small cell lung cancer (NSCLC) caused by the spread of malignant cells to the leptomeninges and cerebrospinal fluid (CSF). While intra-CSF methotrexate (MTX) chemotherapy can improve prognosis, eventual MTX resistance deters continued chemotherapy. Recent studies have shown that increased miRNA-21 (miR-21) expression in the CSF of patients with LM after intraventricular MTX-chemotherapy is associated with poor overall survival; however, the molecular mechanisms underlying this resistance are poorly understood. Here, we confirm, in 36 patients with NSCLC-LM, that elevated miR-21 expression prior to treatment correlates with poor prognosis. MiR-21 overexpression or sponging results in a corresponding increase or decrease in MTX resistance, demonstrating that cellular miR-21 expression correlates with drug resistance. MiR-21-monitoring sensor and fluorescent extracellular vesicle (EV) staining revealed that EV-mediated delivery of miR-21 could modulate MTX resistance. Moreover, EVs isolated from the CSF of LM patients containing miR-21 could enhance the cell proliferation and MTX resistance of recipient cells. These results indicate that miR-21 can be transferred from cell-to-cell via EVs and potentially modulate MTX sensitivity, suggesting that miR-21 in CSF EVs may be a prognostic and therapeutic target for overcoming MTX resistance in patients with NSCLC-LM. [ABSTRACT FROM AUTHOR]

Published
2024
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27. Fam20C Kinase as A Key Regulator of Bevacizumab Resistance in Mesenchymal Glioblastoma

Author

Kim, Chan Il, primary, Kim, Sooheon, additional, Park, Seong‐Min, additional, Kim, Sung Soo, additional, Kwon, Hyung Joon, additional, Lin, Weiwei, additional, Park, Saewhan, additional, Ha, Seokjun, additional, Ha, Kyung Hee, additional, Park, Sanha, additional, Park, Seung Min, additional, Kim, Tae Hoon, additional, Kim, Kyung‐Hee, additional, Kim, Yun‐Hee, additional, Kim, Jong Heon, additional, and Park, Jong Bae, additional

Published
2023
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38. Hydrodynamic ram behaviour in ram simulator

Author

Asia Pacific International Symposium on Aerospace Technology (2015 : Cairns, Qld.), Bae, Hongsu, Woo, Kyeongsik, Kim, In-Gul, and Kim, Jong-Heon

Published
2015

41. MARS2 drives metabolic switch of non-small-cell lung cancer cells via interaction with MCU

Author

Son, Juhyeon, primary, Jung, Okkeun, additional, Kim, Jong Heon, additional, Park, Kyu Sang, additional, Kweon, Hee-Seok, additional, Nguyen, Nhung Thi, additional, Lee, Yu Jin, additional, Cha, Hansol, additional, Lee, Yejin, additional, Tran, Quangdon, additional, Seo, Yoona, additional, Park, Jongsun, additional, Choi, Jungwon, additional, Cheong, Heesun, additional, and Lee, Sang Yeol, additional

Published
2023
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42. Data from Transglutaminase 2 Inhibition Reverses Mesenchymal Transdifferentiation of Glioma Stem Cells by Regulating C/EBPβ Signaling

Author

Yin, Jinlong, primary, Oh, Young Taek, primary, Kim, Jeong-Yub, primary, Kim, Sung Soo, primary, Choi, Eunji, primary, Kim, Tae Hoon, primary, Hong, Jun Hee, primary, Chang, Nakho, primary, Cho, Hee Jin, primary, Sa, Jason K., primary, Kim, Jeong Cheol, primary, Kwon, Hyung Joon, primary, Park, Saewhan, primary, Lin, Weiwei, primary, Nakano, Ichiro, primary, Gwak, Ho-Shin, primary, Yoo, Heon, primary, Lee, Seung-Hoon, primary, Lee, Jeongwu, primary, Kim, Jong Heon, primary, Kim, Soo-Youl, primary, Nam, Do-Hyun, primary, Park, Myung-Jin, primary, and Park, Jong Bae, primary

Published
2023
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43. Supplementary Figure 1-3 from Transglutaminase 2 Inhibition Reverses Mesenchymal Transdifferentiation of Glioma Stem Cells by Regulating C/EBPβ Signaling

Author

Yin, Jinlong, primary, Oh, Young Taek, primary, Kim, Jeong-Yub, primary, Kim, Sung Soo, primary, Choi, Eunji, primary, Kim, Tae Hoon, primary, Hong, Jun Hee, primary, Chang, Nakho, primary, Cho, Hee Jin, primary, Sa, Jason K., primary, Kim, Jeong Cheol, primary, Kwon, Hyung Joon, primary, Park, Saewhan, primary, Lin, Weiwei, primary, Nakano, Ichiro, primary, Gwak, Ho-Shin, primary, Yoo, Heon, primary, Lee, Seung-Hoon, primary, Lee, Jeongwu, primary, Kim, Jong Heon, primary, Kim, Soo-Youl, primary, Nam, Do-Hyun, primary, Park, Myung-Jin, primary, and Park, Jong Bae, primary

Published
2023
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44. Data from A Nanoparticle System Specifically Designed to Deliver Short Interfering RNA Inhibits Tumor Growth In vivo

Author

Yagi, Nobuhiro, primary, Manabe, Ichiro, primary, Tottori, Tsuneaki, primary, Ishihara, Atsushi, primary, Ogata, Fusa, primary, Kim, Jong Heon, primary, Nishimura, Satoshi, primary, Fujiu, Katsuhito, primary, Oishi, Yumiko, primary, Itaka, Keiji, primary, Kato, Yasuki, primary, Yamauchi, Masahiro, primary, and Nagai, Ryozo, primary

Published
2023
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45. Supplementary Methods, Figures 1-8, Tables 1-2 from A Nanoparticle System Specifically Designed to Deliver Short Interfering RNA Inhibits Tumor Growth In vivo

Author

Yagi, Nobuhiro, primary, Manabe, Ichiro, primary, Tottori, Tsuneaki, primary, Ishihara, Atsushi, primary, Ogata, Fusa, primary, Kim, Jong Heon, primary, Nishimura, Satoshi, primary, Fujiu, Katsuhito, primary, Oishi, Yumiko, primary, Itaka, Keiji, primary, Kato, Yasuki, primary, Yamauchi, Masahiro, primary, and Nagai, Ryozo, primary

Published
2023
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46. Monitoring Student Data Analytics Associated with Interacting in a Open EdX Course

Author

Ravi, Harish, Perez Lozano, Joan, Kim, Jong Heon, Rahimi bafrani, Raena, Ravi, Harish, Perez Lozano, Joan, Kim, Jong Heon, and Rahimi bafrani, Raena

Abstract

The Boeing Company, an American multinational corporation that designs, manufactures, and sells airplanes, rotorcraft, rockets, satellites, telecommunications equipment, and missiles worldwide, has recently announced a technology research project called Asynchronous Learning Experience Ideas for Boeing. In this project, they are looking for a group of software engineers to develop code to monitor student data analytics associated with interacting in an OpenEdX course as a part of a technology research project called Asynchronous Learning Experience Ideas for Boeing. The analytics could have various degrees of utility for various stakeholders at Boeing. Technical Stakeholders might want to know about system metrics relevant to ensure operational excellence, ensuring infrastructure stability, real-time monitoring of system performance, etc. The non-technical stakeholders might be interested in knowing about the accessibility of systems, the utility of the courses towards a learning objective among other things. Thus we would like to design systems that allow a data scientist to derive insights of interest from the Open EdX ecosystem. The purpose of the system is to monitor and analyze student data analytics associated with interacting in an OpenEdX course. The system aims to collect and analyze data on student interactions with courses, quizzes, and videos, and generate visualizations and reports that can be used to derive insights into the learning effectiveness of the courses, as well as the system's performance and stability. The ultimate goal of the system is to demonstrate the capability of using OpenEdX as an alternative to CANVAS for a learning platform and to allow data scientists to derive insights of interest from the OpenEdX ecosystem. This observability system aims to provide valuable insights into the performance, reliability, and accessibility of the system, allowing for proactive identification and resolution of issues and improving overall system healt

Published
2023

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