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Ayala-Orozco C, Galvez-Aranda D, Corona A, Seminario JM, Rangel R, Myers JN, Tour JM. Molecular jackhammers eradicate cancer cells by vibronic-driven action. Nat Chem 2024; 16:456-465. [PMID: 38114816 DOI: 10.1038/s41557-023-01383-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [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] [Received: 10/10/2022] [Accepted: 10/24/2023] [Indexed: 12/21/2023]
Abstract
Through the actuation of vibronic modes in cell-membrane-associated aminocyanines, using near-infrared light, a distinct type of molecular mechanical action can be exploited to rapidly kill cells by necrosis. Vibronic-driven action (VDA) is distinct from both photodynamic therapy and photothermal therapy as its mechanical effect on the cell membrane is not abrogated by inhibitors of reactive oxygen species and it does not induce thermal killing. Subpicosecond concerted whole-molecule vibrations of VDA-induced mechanical disruption can be achieved using very low concentrations (500 nM) of aminocyanines or low doses of light (12 J cm-2, 80 mW cm-2 for 2.5 min), resulting in complete eradication of human melanoma cells in vitro. Also, 50% tumour-free efficacy in mouse models for melanoma was achieved. The molecules that destroy cell membranes through VDA have been termed molecular jackhammers because they undergo concerted whole-molecule vibrations. Given that a cell is unlikely to develop resistance to such molecular mechanical forces, molecular jackhammers present an alternative modality for inducing cancer cell death.
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Affiliation(s)
| | - Diego Galvez-Aranda
- Department of Chemical Engineering and Department of Electrical and Computer Engineering, Texas A&M University, College Station, TX, USA
| | - Arnoldo Corona
- Department of Head and Neck Surgery, Division of Surgery, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Jorge M Seminario
- Department of Chemical Engineering and Department of Electrical and Computer Engineering, Texas A&M University, College Station, TX, USA.
- Department of Materials Science and Engineering, Texas A&M University, College Station, TX, USA.
| | - Roberto Rangel
- Department of Head and Neck Surgery, Division of Surgery, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Jeffrey N Myers
- Department of Head and Neck Surgery, Division of Surgery, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.
| | - James M Tour
- Department of Chemistry, Rice University, Houston, TX, USA.
- Department of Materials Science and NanoEngineering, NanoCarbon Center, Smalley-Curl Institute and The Rice Advanced Materials Institute, Rice University, Houston, TX, USA.
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2
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Nawarathne CP, Aranda DG, Hoque A, Dangel GR, Seminario JM, Alvarez NT. Creating covalent bonds between Cu and C at the interface of metal/open-ended carbon nanotubes. Nanoscale Adv 2024; 6:428-442. [PMID: 38235085 PMCID: PMC10791115 DOI: 10.1039/d3na00500c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/08/2023] [Accepted: 11/21/2023] [Indexed: 01/19/2024]
Abstract
The unique electrical properties of carbon nanotubes (CNTs) are highly desired in many technological applications. Unfortunately, in practice, the electrical conductivity of most CNTs and their assemblies has fallen short of expectations. One reason for this poor performance is that electrical resistance develops at the interface between carbon nanomaterials and metal surfaces when traditional metal-metal type contacts are employed. Here, a method for overcoming this resistance using covalent bond formation between open-ended CNTs and Cu surfaces is investigated experimentally and supported by theoretical calculations. The open-ended CNTs are vertically oriented compared to the substrate and have carboxylic functional groups that react with aminophenyl groups (linkers) grafted on metal surfaces. The covalent bond formation, crosslinking carboxylic and amine, via amide bond formation occurs at 120 °C. The covalent bonding nature of the aminophenyl linker is demonstrated theoretically using (100), (110), and (111) Cu surfaces, and bridge-like bond formation between carbon and two adjacent Cu atoms is revealed. The electrical conductivity calculated for a single intramolecular-type junction supports covalent bond formation between Cu and CNTs. Experimentally, the robustness of the covalent bonding between vertically oriented CNTs is tested by exposing CNTs on Cu to sonication, which reveals that CNTs remain fixed to the Cu supports. Since bonding CNTs to metals was performed at low temperatures, the reported method of covalent bond formation is expected to facilitate the application of CNTs in multiple fields, including electronics.
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Affiliation(s)
| | - Diego Galvez Aranda
- The Department of Chemical Engineering, Texas A&M University College Station TX 77843 USA
| | - Abdul Hoque
- Department of Chemistry, University of Cincinnati Cincinnati OH 45221 USA
| | - Gabrielle R Dangel
- Department of Chemistry, University of Cincinnati Cincinnati OH 45221 USA
| | - Jorge M Seminario
- The Department of Chemical Engineering, Texas A&M University College Station TX 77843 USA
| | - Noe T Alvarez
- Department of Chemistry, University of Cincinnati Cincinnati OH 45221 USA
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3
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Xu Y, Jia H, Gao P, Galvez-Aranda DE, Beltran SP, Cao X, Le PML, Liu J, Engelhard MH, Li S, Ren G, Seminario JM, Balbuena PB, Zhang JG, Xu W, Wang C. Direct in situ measurements of electrical properties of solid-electrolyte interphase on lithium metal anodes. Nat Energy 2023; 8:1345-1354. [PMID: 38249622 PMCID: PMC10798234 DOI: 10.1038/s41560-023-01361-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Accepted: 08/22/2023] [Indexed: 01/23/2024]
Abstract
The solid-electrolyte interphase (SEI) critically governs the performance of rechargeable batteries. An ideal SEI is expected to be electrically insulative to prevent persistently parasitic reactions between the electrode and the electrolyte and ionically conductive to facilitate Faradaic reactions of the electrode. However, the true nature of the electrical properties of the SEI remains hitherto unclear due to the lack of a direct characterization method. Here we use in situ bias transmission electron microscopy to directly measure the electrical properties of SEIs formed on copper and lithium substrates. We reveal that SEIs show a voltage-dependent differential conductance. A higher rate of differential conductance induces a thicker SEI with an intricate topographic feature, leading to an inferior Coulombic efficiency and cycling stability in Li∣∣Cu and Li∣∣LiNi0.8Mn0.1Co0.1O2 cells. Our work provides insight into the targeted design of the SEI with desired characteristics towards better battery performance.
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Affiliation(s)
- Yaobin Xu
- Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA, USA
- These authors contributed equally: Yaobin Xu, Hao Jia
| | - Hao Jia
- Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, WA, USA
- These authors contributed equally: Yaobin Xu, Hao Jia
| | - Peiyuan Gao
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA, USA
| | - Diego E. Galvez-Aranda
- Department of Chemical Engineering, Texas A&M University, College Station, TX, USA
- Department of Electrical and Computer Engineering, Texas A&M University, College Station, TX, USA
| | - Saul Perez Beltran
- Department of Chemical Engineering, Texas A&M University, College Station, TX, USA
| | - Xia Cao
- Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, WA, USA
| | - Phung M. L. Le
- Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, WA, USA
| | - Jianfang Liu
- The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - Mark H. Engelhard
- Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA, USA
| | - Shuang Li
- Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA, USA
| | - Gang Ren
- The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - Jorge M. Seminario
- Department of Chemical Engineering, Texas A&M University, College Station, TX, USA
- Department of Electrical and Computer Engineering, Texas A&M University, College Station, TX, USA
- Department of Materials Science and Engineering, Texas A&M University, College Station, TX, USA
| | - Perla B. Balbuena
- Department of Chemical Engineering, Texas A&M University, College Station, TX, USA
- Department of Materials Science and Engineering, Texas A&M University, College Station, TX, USA
- Department of Chemistry, Texas A&M University, College Station, TX, USA
| | - Ji-Guang Zhang
- Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, WA, USA
| | - Wu Xu
- Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, WA, USA
| | - Chongmin Wang
- Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA, USA
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4
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Borges-Martínez M, Montenegro-Pohlhammer N, Zhang X, Galvez-Aranda DE, Ponce V, Seminario JM, Cárdenas-Jirón G. Fullerene binding effects in Al(III)/Zn(II) Porphyrin/Phthalocyanine photophysical properties and charge transport. Spectrochim Acta A Mol Biomol Spectrosc 2022; 269:120740. [PMID: 34968837 DOI: 10.1016/j.saa.2021.120740] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2021] [Revised: 12/02/2021] [Accepted: 12/08/2021] [Indexed: 06/14/2023]
Abstract
We evaluate the fullerene C60 binding effect; through the metal (Al) and through the ligand (Pc,TPP), on the photophysical and charge transport properties of M-porphyrin(TPP)/phthalocyanine(Pc) (M = Al(III), Zn(II)). We perform density functional theory (DFT) and time-dependent DFT calculations for the macrocycle-C60 dyads, showing that all systems studied are thermodynamically favorable. The C60 binding effect on the absorption spectrum is a red-shift of the Q and Soret (B) bands of TPPs and Pcs. The Pc-dyads show longer λ for Q bands (673 nm) than those with TPP (568 nm). AlTPP-C60 and ZnTPP-C60 show a more favorable electron injection to TiO2 than the analogs Pcs, and the regeneration of the dye is preferred in AlTPP-C60 and AlPc-C60. Zero-bias conductance is computed (10-4-10-7 G0) for the dyads using molecular junctions with Au(111)-based electrodes. When a bias voltage of around 0.6 V up to 1 V is applied, an increase in current is obtained for AlTPP-C60 (10-7 A), ZnTPP-C60 (10-7 A), and AlPc-C60 (10-8 A). Although there is not a unique trend in the behavior of the dyads, Pcs have better photophysical properties than TPPs and the latter are better in the charge transport. We conclude that AlTPP(ZnTPP)-C60 dyads are an excellent alternative for designing new materials for dye-sensitized solar cells or optoelectronic devices.
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Affiliation(s)
- Merlys Borges-Martínez
- Laboratory of Theoretical Chemistry, Faculty of Chemistry and Biology, University of Santiago de Chile (USACH), 9170022, Santiago, Chile.
| | - Nicolás Montenegro-Pohlhammer
- Laboratory of Theoretical Chemistry, Faculty of Chemistry and Biology, University of Santiago de Chile (USACH), 9170022, Santiago, Chile.
| | - Xiance Zhang
- Department of Chemical Engineering, Texas A&M University, College Station, Texas, U.S.A
| | - Diego E Galvez-Aranda
- Department of Chemical Engineering, Texas A&M University, College Station, Texas, U.S.A
| | - Victor Ponce
- Department of Chemical Engineering, Texas A&M University, College Station, Texas, U.S.A
| | - Jorge M Seminario
- Department of Chemical Engineering, Texas A&M University, College Station, Texas, U.S.A.
| | - Gloria Cárdenas-Jirón
- Laboratory of Theoretical Chemistry, Faculty of Chemistry and Biology, University of Santiago de Chile (USACH), 9170022, Santiago, Chile.
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5
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Cao L, Li D, Soto FA, Ponce V, Zhang B, Ma L, Deng T, Seminario JM, Hu E, Yang XQ, Balbuena PB, Wang C. Highly Reversible Aqueous Zinc Batteries enabled by Zincophilic-Zincophobic Interfacial Layers and Interrupted Hydrogen-Bond Electrolytes. Angew Chem Int Ed Engl 2021; 60:18845-18851. [PMID: 34196094 DOI: 10.1002/anie.202107378] [Citation(s) in RCA: 60] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2021] [Indexed: 12/22/2022]
Abstract
Aqueous Zn batteries promise high energy density but suffer from Zn dendritic growth and poor low-temperature performance. Here, we overcome both challenges by using an eutectic 7.6 m ZnCl2 aqueous electrolyte with 0.05 m SnCl2 additive, which in situ forms a zincophilic/zincophobic Sn/Zn5 (OH)8 Cl2 ⋅H2 O bilayer interphase and enables low temperature operation. Zincophilic Sn decreases Zn plating/stripping overpotential and promotes uniform Zn plating, while zincophobic Zn5 (OH)8 Cl2 ⋅H2 O top-layer suppresses Zn dendrite growth. The eutectic electrolyte has a high ionic conductivity of ≈0.8 mS cm-1 even at -70 °C due to the distortion of hydrogen bond network by solvated Zn2+ and Cl- . The eutectic electrolyte enables Zn∥Ti half-cell a high Coulombic efficiency (CE) of >99.7 % for 200 cycles and Zn∥Zn cell steady charge/discharge for 500 h with a low overpotential of 8 mV at 3 mA cm-2 . Practically, Zn∥VOPO4 batteries maintain >95 % capacity with a CE of >99.9 % for 200 cycles at -50 °C, and retain ≈30 % capacity at -70 °C of that at 20 °C.
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Affiliation(s)
- Longsheng Cao
- Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, 20742, USA
| | - Dan Li
- Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, 20742, USA
| | - Fernando A Soto
- Department of Chemical Engineering, Texas A&M University, College Station, TX, 77843, USA
| | - Victor Ponce
- Department of Chemical Engineering, Texas A&M University, College Station, TX, 77843, USA
| | - Bao Zhang
- Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, 20742, USA
| | - Lu Ma
- National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, NY, 11973, USA
| | - Tao Deng
- Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, 20742, USA
| | - Jorge M Seminario
- Department of Chemical Engineering, Texas A&M University, College Station, TX, 77843, USA.,Department of Materials Science and Engineering, Texas A&M University, College Station, TX, 77843, USA.,Department of Electrical and Computer Engineering, Texas A&M University, College Station, TX, 77843, USA
| | - Enyuan Hu
- Chemistry Division, Brookhaven National Laboratory, Upton, NY, 11973, USA
| | - Xiao-Qing Yang
- Chemistry Division, Brookhaven National Laboratory, Upton, NY, 11973, USA
| | - Perla B Balbuena
- Department of Chemical Engineering, Texas A&M University, College Station, TX, 77843, USA.,Department of Materials Science and Engineering, Texas A&M University, College Station, TX, 77843, USA
| | - Chunsheng Wang
- Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, 20742, USA
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6
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Cao L, Li D, Soto FA, Ponce V, Zhang B, Ma L, Deng T, Seminario JM, Hu E, Yang X, Balbuena PB, Wang C. Highly Reversible Aqueous Zinc Batteries enabled by Zincophilic–Zincophobic Interfacial Layers and Interrupted Hydrogen‐Bond Electrolytes. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202107378] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Longsheng Cao
- Department of Chemical and Biomolecular Engineering University of Maryland College Park MD 20742 USA
| | - Dan Li
- Department of Chemical and Biomolecular Engineering University of Maryland College Park MD 20742 USA
| | - Fernando A. Soto
- Department of Chemical Engineering Texas A&M University College Station TX 77843 USA
| | - Victor Ponce
- Department of Chemical Engineering Texas A&M University College Station TX 77843 USA
| | - Bao Zhang
- Department of Chemical and Biomolecular Engineering University of Maryland College Park MD 20742 USA
| | - Lu Ma
- National Synchrotron Light Source II Brookhaven National Laboratory Upton NY 11973 USA
| | - Tao Deng
- Department of Chemical and Biomolecular Engineering University of Maryland College Park MD 20742 USA
| | - Jorge M. Seminario
- Department of Chemical Engineering Texas A&M University College Station TX 77843 USA
- Department of Materials Science and Engineering Texas A&M University College Station TX 77843 USA
- Department of Electrical and Computer Engineering Texas A&M University College Station TX 77843 USA
| | - Enyuan Hu
- Chemistry Division Brookhaven National Laboratory Upton NY 11973 USA
| | - Xiao‐Qing Yang
- Chemistry Division Brookhaven National Laboratory Upton NY 11973 USA
| | - Perla B. Balbuena
- Department of Chemical Engineering Texas A&M University College Station TX 77843 USA
- Department of Materials Science and Engineering Texas A&M University College Station TX 77843 USA
| | - Chunsheng Wang
- Department of Chemical and Biomolecular Engineering University of Maryland College Park MD 20742 USA
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7
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Zhang X, Ponce V, Galvez-Aranda DE, Zhou G, Zhou H, Seminario JM. CS 2 Removal from C 5 Distillates by Reactive Molecular Dynamics Simulations. Ind Eng Chem Res 2021. [DOI: 10.1021/acs.iecr.1c00530] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xiance Zhang
- College of New Energy and Materials, China University of Petroleum-Beijing, Beijing 102249, China
- Department of Chemical Engineering, Texas A&M University, College Station, Texas 77843, United States
| | - Victor Ponce
- Department of Chemical Engineering, Texas A&M University, College Station, Texas 77843, United States
- Department of Materials Science and Engineering, Texas A&M University, College Station, Texas 77843, United States
| | - Diego E. Galvez-Aranda
- Department of Chemical Engineering, Texas A&M University, College Station, Texas 77843, United States
- Department of Electrical and Computer Engineering, Texas A&M University, College Station, Texas 77843, United States
| | - Guanglin Zhou
- College of New Energy and Materials, China University of Petroleum-Beijing, Beijing 102249, China
| | - Hongjun Zhou
- College of New Energy and Materials, China University of Petroleum-Beijing, Beijing 102249, China
| | - Jorge M. Seminario
- Department of Chemical Engineering, Texas A&M University, College Station, Texas 77843, United States
- Department of Electrical and Computer Engineering, Texas A&M University, College Station, Texas 77843, United States
- Department of Materials Science and Engineering, Texas A&M University, College Station, Texas 77843, United States
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8
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Ponce V, Galvez-Aranda DE, Seminario JM. Analysis of an all-solid state nanobattery using molecular dynamics simulations under an external electric field. Phys Chem Chem Phys 2021; 23:597-606. [PMID: 33331379 DOI: 10.1039/d0cp02851g] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Present Li-ion battery (LIB) technology requires strong improvements in performance, energy capacity, charging-time, and cost to expand their application to e-mobility and grid storage. Li-metal is one of the most promising materials to replace commercial anodes such as graphite because of its 10 times higher specific capacity. However, Li-metal has high reactivity with commercial liquid electrolytes; thus, new solid materials are proposed to replace liquid electrolytes when Li-metal anodes are used. We present a theoretical analysis of the charging process in a full nanobattery, containing a LiCoO2 cathode, a Li7P2S8I solid-state electrolyte (SSE), a Li-metal anode as well as Al and Cu collectors for the cathode and anode, respectively. In addition, we added a Li3P/Li2S film as a solid electrolyte interphase (SEI) layer between the Li-anode and SSE. Thus, we focus this study on the SEI and SSE. We simulated the charging of the nanobattery with an external voltage by applying an electric field. We estimated temperature profiles within the nanobattery and analyzed Li-ion transport through the SSE and SEI. We observed a slight temperature rise at the SEI due to reactions forming PS3- and P2S74- fragments at the interfaces; however, this temperature profile changes due to the charging current under the presence of the external electric field ε = 0.75 V Å-1. Without the external field, the calculated open-circuit voltage (OCV) was 3.86 V for the battery, which is within the range of values of commercial cobalt-based LIBs. This voltage implies a spontaneous fall of available Li-ions from the anode to the cathode (during discharge). The charge of this nanobattery requires overcoming the OCV plus an additional voltage that determines the charging current. Thus, we applied an external potential able to neutralize the OCV, plus an additional 1.6 V to induce the transport of Li+ from the cathode up to the anode. Several interesting details about Li+ transport paths through the SSE and SEI are discussed.
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Affiliation(s)
- Victor Ponce
- Department of Chemical Engineering, Texas A&M University, College Station, TX 77843, USA.
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9
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Galvez-Aranda DE, Seminario JM. Solid electrolyte interphase formation between the Li 0.29La 0.57TiO 3 solid-state electrolyte and a Li-metal anode: an ab initio molecular dynamics study. RSC Adv 2020; 10:9000-9015. [PMID: 35496544 PMCID: PMC9050065 DOI: 10.1039/c9ra10984f] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [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: 12/28/2019] [Accepted: 02/24/2020] [Indexed: 11/21/2022] Open
Abstract
An ab initio molecular dynamics study of an electrochemical interface between a solid-state-electrolyte Li0.29La0.57TiO3 and Li-metal is performed to analyze interphase formation and evolution when external electric fields of 0, 0.5, 1.0 and 2.0 V Å-1 are applied. From this electrochemical stability analysis, it was concluded that lithium-oxide (Li2O) and lanthanum-oxide (La2O3) phases were formed at the electrolyte/anode interphase. As the electric field increased, oxygen from the electrolyte diffused through the Li-metal anode, increasing the amount of O from deeper crystallographic planes of the electrolyte that reacted with Li and La. A strong reduction of Ti was expected from their Bader charge variation from +3.5 in the bulk to +2.5 at the interface. Due to the loss of Li atoms from the anode to form Li-oxide at the interphase, vacancies were created on the Li-metal, causing anode structure amorphization near the Li-oxide phase and keeping the rest of the anode structure as BCC. Therefore, the interface was unstable because of the continuous Li-oxide and La-oxide formation and growth, which were more pronounced when increasing the external electric field.
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Affiliation(s)
- Diego E Galvez-Aranda
- Department of Chemical Engineering, Texas A&M University College Station TX 77843 USA .,Department of Electrical and Computer Engineering, Texas A&M University College Station TX 77843 USA
| | - Jorge M Seminario
- Department of Chemical Engineering, Texas A&M University College Station TX 77843 USA .,Department of Electrical and Computer Engineering, Texas A&M University College Station TX 77843 USA.,Department of Materials Science and Engineering, Texas A&M University College Station TX 77843 USA
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10
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Selis LA, Seminario JM. Dendrite formation in Li-metal anodes: an atomistic molecular dynamics study. RSC Adv 2019; 9:27835-27848. [PMID: 35530483 PMCID: PMC9071028 DOI: 10.1039/c9ra05067a] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [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: 07/04/2019] [Accepted: 08/14/2019] [Indexed: 11/21/2022] Open
Abstract
Lithium-metal is a desired material for anodes of Li-ion and beyond Li-ion batteries because of its large theoretical specific capacity of 3860 mA h g−1 (the highest known so far), low density, and extremely low potential. Unfortunately, there are several problems that restrict the practical application of lithium-metal anodes, such as the formation of dendrites and reactivity with electrolytes. We present here a study of lithium dendrite formation on a Li-metal anode covered by a cracked solid electrolyte interface (SEI) of LiF in contact with a typical liquid electrolyte composed of 1 M LiPF6 salt solvated in ethylene carbonate. The study uses classical molecular dynamics on a model nanobattery. We tested three ways to charge the nanobattery: (1) constant current at a rate of one Li+ per 0.4 ps, (2) pulse train 10 Li+ per 4 ps, and (3) constant number ions in the electrolyte: one Li+ enters the electrolyte from the cathode as one Li+ exits the electrolyte to the anode. We found that although the SEI does not interfere with the lithiation, the mere presence of a crack in the SEI boosts and guides dendrite formation at temperatures between 325 K and 410.7 K at any C-rate, being more favorable at 325 K than at 410.7 K. On the other hand, we find that a higher C-rate (2.2C) favors the lithium dendrite formation compared to a lower C-rate (1.6C). Thus the battery could store more energy in a safe way at a lower C-rate. Lithium dendrites (blue) growing through the cracks of a SEI (orange) covering a Li-metal anode (blue) while lithiation by Li-ions (purple). The electrolyte is not shown.![]()
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Affiliation(s)
- Luis A. Selis
- Department of Chemical Engineering
- Department of Electrical and Computer Engineering
- Department of Materials Science and Engineering
- Texas A&M University
- College Station
| | - Jorge M. Seminario
- Department of Chemical Engineering
- Department of Electrical and Computer Engineering
- Department of Materials Science and Engineering
- Texas A&M University
- College Station
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11
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Jha S, Ponce V, Seminario JM. Investigating the effects of vacancies on self-diffusion in silicon clusters using classical molecular dynamics. J Mol Model 2018; 24:290. [DOI: 10.1007/s00894-018-3814-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2018] [Accepted: 08/29/2018] [Indexed: 11/29/2022]
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12
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Affiliation(s)
- Narendra Kumar
- Department of Chemical Engineering, Texas A&M University, College Station, TX, USA
| | - Jorge M. Seminario
- Department of Chemical Engineering, Texas A&M University, College Station, TX, USA
- Department of Electrical and Computer Engineering, Texas A&M University, College Station, TX, USA
- Department of Materials Science and Engineering, Texas A&M University, College Station, TX, USA
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13
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Abstract
This Review focuses on research oriented toward elucidation of the various aspects that determine adsorption of CO2 in metal-organic frameworks and its separation from gas mixtures found in industrial processes. It includes theoretical, experimental, and combined approaches able to characterize the materials, investigate the adsorption/desorption/reaction properties of the adsorbates inside such environments, screen and design new materials, and analyze additional factors such as material regenerability, stability, effects of impurities, and cost among several factors that influence the effectiveness of the separations. CO2 adsorption, separations, and membranes are reviewed followed by an analysis of the effects of stability, impurities, and process operation conditions on practical applications.
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Affiliation(s)
| | | | | | - Yuguang Ma
- Department of Chemical Engineering, Texas A&M University , College Station, Texas 77843, United States
| | - Jorge M Seminario
- Department of Chemical Engineering, Texas A&M University , College Station, Texas 77843, United States
| | - Perla B Balbuena
- Department of Chemical Engineering, Texas A&M University , College Station, Texas 77843, United States
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14
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Galvez-Aranda DE, Ponce V, Seminario JM. Molecular dynamics simulations of the first charge of a Li-ion—Si-anode nanobattery. J Mol Model 2017; 23:120. [DOI: 10.1007/s00894-017-3283-2] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2017] [Accepted: 02/13/2017] [Indexed: 11/25/2022]
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15
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Ma Y, Martinez de la Hoz JM, Angarita I, Berrio-Sanchez JM, Benitez L, Seminario JM, Son SB, Lee SH, George SM, Ban C, Balbuena PB. Structure and Reactivity of Alucone-Coated Films on Si and Li(x)Si(y) Surfaces. ACS Appl Mater Interfaces 2015; 7:11948-11955. [PMID: 25985821 DOI: 10.1021/acsami.5b01917] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Coating silicon particles with a suitable thin film has appeared as a possible solution to accommodate the swelling of silicon upon lithiation and its posterior cracking and pulverization during cycling of Li-ion batteries. In particular, aluminum alkoxide (alucone) films have been recently deposited over Si anodes, and the lithiation and electrochemical behavior of the system have been characterized. However, some questions remain regarding the lithium molecular migration mechanisms through the film and the electronic properties of the alucone film. Here we use density functional theory, ab initio molecular dynamics simulations, and Green's function theory to examine the film formation, lithiation, and reactivity in contact with an electrolyte solution. It is found that the film is composed of Al-O complexes with 3-O or 4-O coordination. During lithiation, Li atoms bind very strongly to the O atoms in the most energetically favorable sites. After the film is irreversibly saturated with Li atoms, it becomes electronically conductive. The ethylene carbonate molecules in liquid phase are found to be reduced at the surface of the Li-saturated alucone film following similar electron transfer mechanisms as found previously for lithiated silicon anodes. The theoretical results are in agreement with those from morphology and electrochemical analyses.
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Affiliation(s)
| | | | | | | | | | | | - Seoung-Bum Son
- ∥National Renewable Energy Laboratory, 1617 Cole Boulevard, Golden, Colorado 80401, United States
| | - Se-Hee Lee
- ⊥University of Colorado at Boulder, Boulder, Colorado 80309, United States
| | - Steven M George
- ⊥University of Colorado at Boulder, Boulder, Colorado 80309, United States
| | - Chunmei Ban
- ∥National Renewable Energy Laboratory, 1617 Cole Boulevard, Golden, Colorado 80401, United States
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16
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Affiliation(s)
- Narendra Kumar
- Department of Chemical Engineering, ‡Department of Materials Science and Engineering, and §Department of Electrical and Computer Engineering Texas A&M University College Station, Texas 77843, United States
| | - Jorge M. Seminario
- Department of Chemical Engineering, ‡Department of Materials Science and Engineering, and §Department of Electrical and Computer Engineering Texas A&M University College Station, Texas 77843, United States
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17
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Salazar-Salinas K, Baldera-Aguayo PA, Encomendero-Risco JJ, Orihuela M, Sheen P, Seminario JM, Zimic M. Metal-ion effects on the polarization of metal-bound water and infrared vibrational modes of the coordinated metal center of Mycobacterium tuberculosis pyrazinamidase via quantum mechanical calculations. J Phys Chem B 2014; 118:10065-75. [PMID: 25055049 PMCID: PMC4514207 DOI: 10.1021/jp504096d] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [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] [Indexed: 02/01/2023]
Abstract
![]()
Mycobacterium tuberculosis pyrazinamidase
(PZAse) is a key enzyme to activate the pro-drug pyrazinamide (PZA).
PZAse is a metalloenzyme that coordinates in vitro different divalent metal cofactors in the metal coordination site
(MCS). Several metals including Co2+, Mn2+,
and Zn2+ are able to reactivate the metal-depleted PZAse in vitro. We use quantum mechanical calculations to investigate
the Zn2+, Fe2+, and Mn2+ metal cofactor
effects on the local MCS structure, metal–ligand or metal–residue
binding energy, and charge distribution. Results suggest that the
major metal-dependent changes occur in the metal–ligand binding
energy and charge distribution. Zn2+ shows the highest
binding energy to the ligands (residues). In addition, Zn2+ and Mn2+ within the PZAse MCS highly polarize the O–H
bond of coordinated water molecules in comparison with Fe2+. This suggests that the coordination of Zn2+ or Mn2+ to the PZAse protein facilitates the deprotonation of coordinated
water to generate a nucleophile for catalysis as in carboxypeptidase
A. Because metal ion binding is relevant to enzymatic reaction, identification
of the metal binding event is important. The infrared vibrational
mode shift of the C=Nε (His) bond from the M. tuberculosis MCS is the best IR probe to metal
complexation.
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Affiliation(s)
- Karim Salazar-Salinas
- Laboratorio de Bioinformática y Biología Molecular, Laboratorios de Investigación y Desarrollo, Facultad de Ciencias y Filosofía, Universidad Peruana Cayetano Heredia , San Martin de Porres, Lima 31 Lima, Perú
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18
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Cristancho D, Benitez L, Seminario JM. Coupling of mechanical and electronic properties of carbon nanotubes. J Mol Model 2013; 19:5237-44. [PMID: 24126827 DOI: 10.1007/s00894-013-2019-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2013] [Accepted: 09/22/2013] [Indexed: 11/26/2022]
Abstract
Because of the potential importance of carbon nanotubes (CNT) in renewable energy and other fields, molecular orbital ab initio calculations are used to study the relation between mechanical and electronic properties of such structures. We estimate a modulus of elasticity of 1.3 TPa and find out that the mechanism of CNT structure deformation is dependent on their chirality. Armchair and chiral nanotubes have ductile deformation fracture while zigzag have both ductile and brittle; on the other hand armchair nanotubes fracture and form two caps while chiral nanotubes adopt a helical-structure conformation. In addition, the energy gap between occupied and unoccupied molecular orbitals increases when nanotubes are under plastic deformation. This strong coupling between mechanical and electrical properties can be used to tune CNT mechanically to specific electronic bandgaps, affecting directly their electromagnetic absorption properties.
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Affiliation(s)
- Dahiyana Cristancho
- Department of Chemical Engineering, Texas A&M University, College Station, TX, USA
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19
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León-Plata PA, Coan MR, Seminario JM. Effects of trimethylaluminium and tetrakis(ethylmethylamino) hafnium in the early stages of the atomic-layer-deposition of aluminum oxide and hafnium oxide on hydroxylated GaN nanoclusters. J Mol Model 2013; 19:4419-32. [PMID: 23918223 DOI: 10.1007/s00894-013-1956-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2013] [Accepted: 07/22/2013] [Indexed: 10/26/2022]
Abstract
We calculate the interactions of two atomic layer deposition (ALD) reactants, trimethylaluminium (TMA) and tetrakis(ethylmethylamino) hafnium (TEMAH) with the hydroxylated Ga-face of GaN clusters when aluminum oxide and hafnium oxide, respectively, are being deposited. The GaN clusters are suitable as testbeds for the actual Ga-face on practical GaN nanocrystals of importance not only in electronics but for several other applications in nanotechnology. We find that TMA spontaneously interacts with hydroxylated GaN; however it does not follow the atomic layer deposition reaction path unless there is an excess in potential energy introduced in the clusters at the beginning of the optimization, for instance, using larger bond lengths of various bonds in the initial structures. TEMAH also does not interact with hydroxylated GaN, unless there is an excess in potential energy. The formation of a Ga-N(CH3)(CH2CH3) bond during the ALD of HfO2 using TEMAH as the reactant without breaking the Hf-N bond could be the key part of the mechanism behind the formation of an interface layer at the HfO2/GaN interface.
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Affiliation(s)
- Paola A León-Plata
- Department of Chemical Engineering, Texas A&M University, College Station, TX, USA
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20
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Bobadilla AD, Samuel ELG, Tour JM, Seminario JM. Calculating the Hydrodynamic Volume of Poly(ethylene oxylated) Single-Walled Carbon Nanotubes and Hydrophilic Carbon Clusters. J Phys Chem B 2012. [DOI: 10.1021/jp305302y] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Alfredo D. Bobadilla
- Department of Chemical Engineering, ‡Department of Electrical and Computer Engineering, and §Materials Science and Engineering Graduate Program, Texas A&M University, College Station, Texas 77843, United States, and ¶Department of Chemistry, ∥Department of Mechanical Engineering and Materials Science, and ⊥Smalley Institute for Nanoscale Science and Technology, Rice University, 6100 Main Street, Houston Texas 77005, United States
| | - Errol. L. G. Samuel
- Department of Chemical Engineering, ‡Department of Electrical and Computer Engineering, and §Materials Science and Engineering Graduate Program, Texas A&M University, College Station, Texas 77843, United States, and ¶Department of Chemistry, ∥Department of Mechanical Engineering and Materials Science, and ⊥Smalley Institute for Nanoscale Science and Technology, Rice University, 6100 Main Street, Houston Texas 77005, United States
| | - James M. Tour
- Department of Chemical Engineering, ‡Department of Electrical and Computer Engineering, and §Materials Science and Engineering Graduate Program, Texas A&M University, College Station, Texas 77843, United States, and ¶Department of Chemistry, ∥Department of Mechanical Engineering and Materials Science, and ⊥Smalley Institute for Nanoscale Science and Technology, Rice University, 6100 Main Street, Houston Texas 77005, United States
| | - Jorge M. Seminario
- Department of Chemical Engineering, ‡Department of Electrical and Computer Engineering, and §Materials Science and Engineering Graduate Program, Texas A&M University, College Station, Texas 77843, United States, and ¶Department of Chemistry, ∥Department of Mechanical Engineering and Materials Science, and ⊥Smalley Institute for Nanoscale Science and Technology, Rice University, 6100 Main Street, Houston Texas 77005, United States
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21
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Salazar-Salinas K, Kubli-Garfias C, Seminario JM. Computational design of a CNT carrier for a high affinity bispecific anti-HER2 antibody based on trastuzumab and pertuzumab Fabs. J Mol Model 2012; 19:2797-810. [DOI: 10.1007/s00894-012-1638-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2012] [Accepted: 10/07/2012] [Indexed: 12/25/2022]
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22
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Cervantes-Salguero K, Seminario JM. Structure and energetics of small iron clusters. J Mol Model 2012; 18:4043-52. [DOI: 10.1007/s00894-012-1395-2] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2011] [Accepted: 02/28/2012] [Indexed: 11/30/2022]
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Abstract
We perform molecular dynamics simulations to analyze the wrapping process of a single-stranded (ss) DNA around a gapped CNT immersed in a bath of water. We observe the formation of a stable molecular junction with the ssDNA adopting a helical or circular conformation around one CNT electrode and a linear conformation around the opposite electrode. We find that DNA undergoes several conformational changes during equilibration of the self-assembled molecular junction. This process would allow a higher yield of successful CNT-DNA interconnections, which constitutes a novel structure of interest in chemical and biological sensing at the single-molecule level.
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Affiliation(s)
- Alfredo D Bobadilla
- Department of Chemical Engineering, Texas A&M University College Station, Texas 77843, USA
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24
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25
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Otero-Navas I, Seminario JM. Molecular electrostatic potentials of DNA base-base pairing and mispairing. J Mol Model 2011; 18:91-101. [PMID: 21625905 DOI: 10.1007/s00894-011-1028-1] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2010] [Accepted: 02/14/2011] [Indexed: 11/28/2022]
Abstract
An understanding of why adenine (A) pairs with thymine (T) and cytosine (C) with guanine (G) in DNA is very useful in the design of sensors and other related devices. We report the use of dissociation energies, geometries and molecular electrostatic potentials (MEPs) to justify the canonical (AT and CG) Watson-Crick pairs. We also analyze all mismatches in both configurations-cis and trans-with respect to their glycoside bonds. As expected, we found that the most stable pair configuration corresponds to CG, providing an energy criterion for that preferred configuration. The reason why A gets together with T is much more difficult to explain as the energy of this pair is smaller than the energy of some other mismatched pairs. We tested MEPs to see if they could shed light on this problem. Interestingly, MEPs yield a unique pattern (shape) for the two canonical cases but different shapes for the mismatches. A tunnel of positive potential surrounded by a negative one is found interconnecting the three H-bonds of CG and the two of AT. This MEP tunnel, assisted partially by energetics and geometrical criteria, unambiguously determine a distinctive feature of the affinity between A and T as well as that between G and C.
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Affiliation(s)
- Ivonne Otero-Navas
- Department of Chemical Engineering, Texas A&M University, College Station, Texas, USA
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26
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Kubli-Garfias C, Salazar-Salinas K, Perez-Angel EC, Seminario JM. Light activation of the isomerization and deprotonation of the protonated Schiff base retinal. J Mol Model 2011; 17:2539-47. [PMID: 21207087 DOI: 10.1007/s00894-010-0927-x] [Citation(s) in RCA: 12] [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] [Received: 10/20/2010] [Accepted: 11/29/2010] [Indexed: 11/29/2022]
Abstract
We perform an ab initio analysis of the photoisomerization of the protonated Schiff base of retinal (PSB-retinal) from 11-cis to 11-trans rotating the C10-C11=C12-C13 dihedral angle from 0° (cis) to -180° (trans). We find that the retinal molecule shows the lowest rotational barrier (0.22 eV) when its charge state is zero as compared to the barrier for the protonated molecule which is ∼0.89 eV. We conclude that rotation most likely takes place in the excited state of the deprotonated retinal. The addition of a proton creates a much larger barrier implying a switching behavior of retinal that might be useful for several applications in molecular electronics. All conformations of the retinal compound absorb in the green region with small shifts following the dihedral angle rotation; however, the Schiff base of retinal (SB-retinal) at trans-conformation absorbs in the violet region. The rotation of the dihedral angle around the C11=C12 π-bond affects the absorption energy of the retinal and the binding energy of the SB-retinal with the proton at the N-Schiff; the binding energy is slightly lower at the trans-SB-retinal than at other conformations of the retinal.
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Affiliation(s)
- Carlos Kubli-Garfias
- Department of Chemical Engineering, Texas A&M University, College Station, TX, USA
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27
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Fu M, Adams RD, Cristancho D, Leon‐Plata P, Seminario JM. Spectroscopic and Photophysical Studies of Charge-Transfer in a Cd8 Thiolate Cluster Complex Containing a Coordinated N-Methyl-4,4′-bipyridinium Ligand. Eur J Inorg Chem 2010. [DOI: 10.1002/ejic.201001062] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Ming‐Lai Fu
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, U.S.A
| | - Richard D. Adams
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, U.S.A
| | - Dahiyana Cristancho
- Department of Chemical Engineering, Materials Science and Engineering Program and Department of Electrical and Computer Engineering, Texas A & M University, College Station, Texas 77843, U.S.A
| | - Paola Leon‐Plata
- Department of Chemical Engineering, Materials Science and Engineering Program and Department of Electrical and Computer Engineering, Texas A & M University, College Station, Texas 77843, U.S.A
| | - Jorge M. Seminario
- Department of Chemical Engineering, Materials Science and Engineering Program and Department of Electrical and Computer Engineering, Texas A & M University, College Station, Texas 77843, U.S.A
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28
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Abstract
Molecules that resemble a semiconductor diode depletion zone are those with an intrinsic electric dipole, which were suggested as potential electronic devices. However, so far, no single molecule has met such a goal because any electron donor-acceptor linker strongly diminishes any possibility of diode behavior. We find an intrinsic diode behavior in polypeptides such as poly(L-alanine) and polyglycine in alpha-helix conformation, explained in terms of molecular orbital theory using ab initio methods. The application of an antiparallel electric field with respect to the molecular dipole yields a gradual increase in current through the junction because the valence and conduction orbitals approach each other reducing their gap as the bias increases. However, a parallel field makes the gap energy increase, avoiding the pass of the electrons.
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Affiliation(s)
- Dahiyana Cristancho
- Department of Chemical Engineering, Texas A&M University, College Station, Texas 77843-3122, USA
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31
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Affiliation(s)
- Norma L Rangel
- Materials Science and Engineering Graduate Program, Texas A&M University, College Station, Texas 77843, USA
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32
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Abstract
We calculate the transverse current through double-stranded DNA nucleotides using ab initio techniques in order to establish a protocol to recognize the type and sequence of double-stranded DNA nucleotides. The distinct current-voltage features between nucleotides are used as signatures for their characterization and sequencing. Extended bulk gold electrodes as well as extensions of the DNA backbones are tested as contacts for the electron transport, yielding currents 2 orders of magnitude larger for the former. The addition of Na or H positive counterions improves the signal levels, thus leading to a better discrimination, especially when sodium cations are added.
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Affiliation(s)
- Luis A Jauregui
- Department of Chemical Engineering, Texas A&M University, College Station, Texas 77843, USA
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33
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Affiliation(s)
- Norma L. Rangel
- Department of Chemical Engineering, Materials Science and Engineering Graduate Program, and Department of Electrical and Computer Engineering, Texas A&M University, College Station, Texas 77843
| | - Kristen S. Williams
- Department of Chemical Engineering, Materials Science and Engineering Graduate Program, and Department of Electrical and Computer Engineering, Texas A&M University, College Station, Texas 77843
| | - Jorge M. Seminario
- Department of Chemical Engineering, Materials Science and Engineering Graduate Program, and Department of Electrical and Computer Engineering, Texas A&M University, College Station, Texas 77843
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34
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Bobadilla AD, Bellido EP, Rangel NL, Zhong H, Norton ML, Sinitskii A, Seminario JM. DNA origami impedance measurement at room temperature. J Chem Phys 2009; 130:171101. [PMID: 19425761 DOI: 10.1063/1.3127362] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Alfredo D Bobadilla
- Department of Chemical Engineering, Texas A&M University, College Station, Texas 77843, USA
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35
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Affiliation(s)
- Ke Wang
- College of Engineering, Texas A&M University, College Station, Texas 77843-3123
| | - Norma L. Rangel
- College of Engineering, Texas A&M University, College Station, Texas 77843-3123
| | - Subrata Kundu
- College of Engineering, Texas A&M University, College Station, Texas 77843-3123
| | - Juan C. Sotelo
- College of Engineering, Texas A&M University, College Station, Texas 77843-3123
| | - Roberto M. Tovar
- College of Engineering, Texas A&M University, College Station, Texas 77843-3123
| | - Jorge M. Seminario
- College of Engineering, Texas A&M University, College Station, Texas 77843-3123
| | - Hong Liang
- College of Engineering, Texas A&M University, College Station, Texas 77843-3123
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36
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Bellido EP, Bobadilla AD, Rangel NL, Zhong H, Norton ML, Sinitskii A, Seminario JM. Current-voltage-temperature characteristics of DNA origami. Nanotechnology 2009; 20:175102. [PMID: 19420582 DOI: 10.1088/0957-4484/20/17/175102] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The temperature dependences of the current-voltage characteristics of a sample of triangular DNA origami deposited in a 100 nm gap between platinum electrodes are measured using a probe station. Below 240 K, the sample shows high impedance, similar to that of the substrate. Near room temperature the current shows exponential behavior with respect to the inverse of temperature. Sweep times of 1 s do not yield a steady state; however sweep times of 450 s for the bias voltage secure a steady state. The thermionic emission and hopping conduction models yield similar barriers of approximately 0.7 eV at low voltages. For high voltages, the hopping conduction mechanism yields a barrier of 0.9 eV and the thermionic emission yields 1.1 eV. The experimental data set suggests that the dominant conduction mechanism is hopping in the range 280-320 K. The results are consistent with theoretical and experimental estimates of the barrier for related molecules.
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Affiliation(s)
- Edson P Bellido
- Department of Chemical Engineering, Texas A&M University, College Station, TX 77843, USA
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37
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Salazar-Salinas K, Jauregui LA, Kubli-Garfias C, Seminario JM. Molecular biosensor based on a coordinated iron complex. J Chem Phys 2009; 130:105101. [DOI: 10.1063/1.3070235] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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38
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Affiliation(s)
- Norma L. Rangel
- Department of Chemical Engineering, Materials Science and Engineering Graduate Program, and Department of Electrical and Computer Engineering, Texas A&M University, College Station, Texas
| | - Jorge M. Seminario
- Department of Chemical Engineering, Materials Science and Engineering Graduate Program, and Department of Electrical and Computer Engineering, Texas A&M University, College Station, Texas
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39
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Affiliation(s)
- Sungmin Hong
- Department of Chemical Engineering, Texas A&M University, College Station, Texas 77843, USA
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40
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Vas J, Ortega C, Olmo V, Perez-Fernandez F, Hernandez L, Medina I, Seminario JM, Herrera A, Luna F, Perea-Milla E, Mendez C, Madrazo F, Jimenez C, Ruiz MA, Aguilar I. Single-point acupuncture and physiotherapy for the treatment of painful shoulder: a multicentre randomized controlled trial. Rheumatology (Oxford) 2008; 47:887-93. [PMID: 18403402 DOI: 10.1093/rheumatology/ken040] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
OBJECTIVE Evaluate the efficacy of acupuncture associated with physiotherapy for patients with painful shoulder. METHODS In a multicentre controlled randomized study, participants were recruited with a clinical diagnosis of unilateral subacromial syndrome from six rehabilitation medicine departments belonging to the Public Health System in two Spanish regions. All participants received 15 sessions of physiotherapy during the 3 weeks that the treatment lasted and were randomized to additionally receive, once a week, acupuncture or mock TENS (transcutaneous electrical nerve stimulation). The primary outcome measure was the change in the Constant-Murley Score (CMS) for functional assessment of the shoulder, at 4 weeks after randomization. This study is registered as an International Standard Randomized Controlled Trial, number ISRCTN28687220. RESULTS A total of 425 patients were recruited. The mean score (s.d.) on the CMS had increased by 16.6 (15.6) points among the acupuncture group, compared with 10.6 (13.5) points in the control group, and the mean difference between the two groups was statistically significant (6.0 points; 95% CI 3.2, 8.8 points; P < 0.001). By the end of the treatment, 53% of the patients in the acupuncture group had decreased their consumption of analgesics, compared with a corresponding 30% among the control group (P < 0.001). CONCLUSIONS Single-point acupuncture in association with physiotherapy improves shoulder function and alleviates pain, compared with physiotherapy as the sole treatment. This improvement is accompanied by a reduction in the consumption of analgesic medicaments.
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Affiliation(s)
- J Vas
- Pain Treatment Unit, Healthcare Centre Doña Mercedes, Calle Segovia s/n, 41700 Dos Hermanas, Spain.
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42
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Rangel NL, Seminario JM. Nanomicrointerface to read molecular potentials into current-voltage based electronics. J Chem Phys 2008; 128:114711. [DOI: 10.1063/1.2888971] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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43
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Affiliation(s)
- Pablo F. Salazar
- Department of Chemical Engineering and Department of Electrical and Computer Engineering, Texas A&M University, College Station, Texas 77843
| | - Jorge M. Seminario
- Department of Chemical Engineering and Department of Electrical and Computer Engineering, Texas A&M University, College Station, Texas 77843
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44
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45
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Affiliation(s)
- Pablo F. Salazar
- Department of Chemical Engineering and Department of Electrical and Computer Engineering, Texas A&M University, College Station, Texas 77843
| | - Jorge M. Seminario
- Department of Chemical Engineering and Department of Electrical and Computer Engineering, Texas A&M University, College Station, Texas 77843
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46
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Miao L, Seminario JM. Molecular dynamics simulations of signal transmission through a glycine peptide chain. J Chem Phys 2007; 127:134708. [DOI: 10.1063/1.2786078] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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47
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Abstract
A very simple, straightforward, and easy to implement fully ab initio procedure for the determination of current-voltage characteristics in molecular junctions is presented. Application of this procedure predicts reasonably well the experimental findings for low bias voltages of a break junction experiment and can help us to characterize its geometry.
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Affiliation(s)
- Diego O Ortiz
- Department of Chemical Engineering, Texas A&M University, College Station, Texas 77843-3122, USA
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48
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49
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Abstract
The interaction of oligophenylene ethynylene (OPE) on the (111) surface of a gold slab resembling a self-assembled monolayer (SAM) is investigated using ab initio density functional theory calculations. The authors performed a full optimization including all atoms in the OPE and in the slab to better understand OPE adsorption on the surface. It is found that OPE has two energetically favorable adsorption sites on the Au surface with relatively different molecular geometries: the nontop site adsorption greatly modifies the (111) surface structure; however, the extensive electron interactions enable a delocalized electron density distribution, implying an improved conductivity between OPE and Au, and the top site which is 0.9 eV higher in energy than the nontop and features weaker Au-S bonds. Interestingly the on top configuration shows a strong spin imbalance along the molecule and the nontop shows a small spin imbalance on the surface. This feature is of strong interest for the development of resonators for the detection of chemical and biological agents. They have also calculated the frequency spectrum of these SAMs, which yield deformations in the gold surface yielding peak frequency shifts specific to each absorption site.
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Affiliation(s)
- Ling Miao
- Department of Chemical Engineering, Texas A&M University, College Station, Texas 77840, USA
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Abstract
Detecting single molecules is a technical and scientific challenge and requires to increase the number of molecules or their cross section to a radiation field in order to have a detectable signal. We demonstrate for a single molecule of oxygen that, by attaching the molecule to a nanocluster, the molecule signature spectrum is transferred to the larger complex (molecule cluster). Therefore, the detection can focus on the complex, which can have a much larger cross section, rather than on the small molecule. This is based on the concept of signature transfer, which can be used to detect in the cluster several other properties of the attached molecule.
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Affiliation(s)
- Jorge M Seminario
- Department of Chemical Engineering, Texas A&M University, College Station, TX 77843-3122, USA.
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