Search Results - "Zeng, Helen J."

Spectroscopic Evidence for an Attractive Cation–Cation Interaction in Hydroxy‐Functionalized Ionic Liquids: A Hydrogen‐Bonded Chain‐like Trimer by Niemann, Thomas, Strate, Anne, Ludwig, Ralf, Zeng, Helen J., Menges, Fabian S., Johnson, Mark A.

“…We address the formation of hydrogen bonded domains among the cationic constituents of the ionic liquid (IL) 1‐(3‐hydroxypropyl)pyridinium tetrafluoroborate…”
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Structural Motifs in Cold Ternary Ion Complexes of Hydroxyl-Functionalized Ionic Liquids: Isolating the Role of Cation–Cation Interactions by Menges, Fabian S, Zeng, Helen J, Kelleher, Patrick J, Gorlova, Olga, Johnson, Mark A, Niemann, Thomas, Strate, Anne, Ludwig, Ralf

“…We address the competition between intermolecular forces underlying the recent observation that ionic liquids (ILs) with a hydroxyl-functionalized cation can…”
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Demystifying the Diffuse Vibrational Spectrum of Aqueous Protons Through Cold Cluster Spectroscopy by Zeng, Helen J, Johnson, Mark A

“…The ease with which the pH is routinely determined for aqueous solutions masks the fact that the cationic product of Arrhenius acid dissolution, the hydrated…”
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Introductory lecture: advances in ion spectroscopy: from astrophysics to biology by Zeng, Helen J, Yang, Nan, Johnson, Mark A

“…This introduction provides a historical context for the development of ion spectroscopy over the past half century by following the evolution of experimental…”
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Chain Length Dependence of Hydrogen Bond Linkages between Cationic Constituents in Hydroxy-Functionalized Ionic Liquids: Tracking Bulk Behavior to the Molecular Level with Cold Cluster Ion Spectroscopy by Zeng, Helen J, Menges, Fabian S, Niemann, Thomas, Strate, Anne, Ludwig, Ralf, Johnson, Mark A

“…Hydroxy functionalization of cations in ionic liquids (ILs) can lead to formation of contacts between their OH groups [so-called (c–c) interactions]. One class…”
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Comment on “C–D Vibration at C2 Position of Imidazolium Cation as a Probe of the Ionic Liquid Microenvironment” by Zeng, Helen J, Menges, Fabian S, Johnson, Mark A

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Ionic Liquid Clusters Generated from Electrospray Thrusters: Cold Ion Spectroscopic Signatures of Size-Dependent Acid–Base Interactions by Zeng, Helen J, Khuu, Thien, Chambreau, Steven D, Boatz, Jerry A, Vaghjiani, Ghanshyam L, Johnson, Mark A

“…We determine the intramolecular distortions at play in the 2-hydroxyethylhydrazinium nitrate (HEHN) ionic liquid (IL) propellant, which presents the…”
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Direct Exfoliation of Nanoribbons from Bulk van der Waals Crystals by Saunders, Ashley P, Chen, Victoria, Wang, Jierong, Li, Qitong, Johnson, Amalya C, McKeown-Green, Amy S, Zeng, Helen J, Mac, T Kien, Trinh, M Tuan, Heinz, Tony F, Pop, Eric, Liu, Fang

“…Confinement of monolayers into quasi-1D atomically thin nanoribbons could lead to novel quantum phenomena beyond those achieved in their bulk and monolayer…”
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Spectroscopic Assessment of Intra- and Intermolecular Hydrogen Bonding in Ether-Functionalized Imidazolium Ionic Liquids by Zeng, Helen J, Johnson, Mark A, Ramdihal, Jasodra D, Sumner, Rawlric A, Rodriguez, Chanele, Lall-Ramnarine, Sharon I, Wishart, James F

“…Functionalization of the imidazolium (Im+) cationic component of ionic liquids (ILs) with ether chains affords the possibility of tuning their properties…”
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Spektroskopischer Nachweis einer attraktiven Kation‐Kation‐ Wechselwirkung in OH‐funktionalisierten ionischen Flüssigkeiten: ein H‐Brücken‐gebundenes kettenförmiges Trimer by Niemann, Thomas, Strate, Anne, Ludwig, Ralf, Zeng, Helen J., Menges, Fabian S., Johnson, Mark A.

“…Wir untersuchen die Bildung von wasserstoffverbrückten Domänen zwischen den kationischen Bestandteilen der ionischen Flüssigkeit (IL)…”
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Hidden phonon highways promote photoinduced interlayer energy transfer in twisted transition metal dichalcogenide heterostructures by Johnson, Amalya C, Georgaras, Johnathan D, Shen, Xiaozhe, Yao, Helen, Saunders, Ashley P, Zeng, Helen J, Kim, Hyungjin, Sood, Aditya, Heinz, Tony F, Lindenberg, Aaron M, Luo, Duan, da Jornada, Felipe H, Liu, Fang

“…Vertically stacked van der Waals (vdW) heterostructures exhibit unique electronic, optical, and thermal properties that can be manipulated by twist-angle…”
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Millimeter-Scale Exfoliation of hBN with Tunable Flake Thickness for Scalable Encapsulation by McKeown-Green, Amy S., Zeng, Helen J., Saunders, Ashley P., Li, Jiayi, Shi, Jiaojian, Shen, Yuejun, Pan, Feng, Hu, Jenny, Dionne, Jennifer A., Heinz, Tony F., Wu, Stephen M., Zheng, Fan, Liu, Fang

“…As a 2D dielectric material, hexagonal boron nitride (hBN) is in high demand for applications in photonic, nonlinear optic, and nanoelectronic devices as an…”
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Direct Exfoliation of Nanoribbons from Bulk van der Waals Crystals by Saunders, Ashley P, Chen, Victoria, Wang, Jierong, Johnson, Amalya C, McKeown-Green, Amy S, Zeng, Helen J, Mac, T. Kien, Trinh, Tuan, Heinz, Tony F, Pop, Eric, Liu, Fang

“…Confinement of monolayers into quasi-one-dimensional atomically-thin nanoribbons could lead to novel quantum phenomena beyond those achieved in their bulk and…”
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Millimeter-scale exfoliation of hBN with tunable flake thickness by McKeown-Green, Amy S, Zeng, Helen J, Saunders, Ashley P, Li, Jiayi, Hu, Jenny, Shi, Jiaojian, Shen, Yuejun, Pan, Feng, Dionne, Jennifer A, Heinz, Tony F, Wu, Stephen, Zheng, Fan, Liu, Fang

“…As a two-dimensional (2D) dielectric material, hexagonal boron nitride (hBN) is in high demand for applications in photonics, nonlinear optics, and…”
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