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Milovanović B, Stanojević A, Etinski M, Petković M. Intriguing Intermolecular Interplay in Guanine Quartet Complexes with Alkali and Alkaline Earth Cations. J Phys Chem B 2020; 124:3002-3014. [DOI: 10.1021/acs.jpcb.0c01165] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Branislav Milovanović
- Faculty of Physical Chemistry, University of Belgrade, Studentski trg 12-16, 11158 Belgrade, Serbia
| | - Ana Stanojević
- Faculty of Physical Chemistry, University of Belgrade, Studentski trg 12-16, 11158 Belgrade, Serbia
| | - Mihajlo Etinski
- Faculty of Physical Chemistry, University of Belgrade, Studentski trg 12-16, 11158 Belgrade, Serbia
| | - Milena Petković
- Faculty of Physical Chemistry, University of Belgrade, Studentski trg 12-16, 11158 Belgrade, Serbia
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Hong Y, Wang S, Li Q, Song X, Wang Z, Zhang X, Besenbacher F, Dong M. Interfacial icelike water local doping of graphene. NANOSCALE 2019; 11:19334-19340. [PMID: 31423505 DOI: 10.1039/c9nr05832j] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Charge transfer at interfaces plays a critical role in the performance of graphene based electronic devices. However, separate control of the charge transfer process in the graphene/SiO2 system is still challenging. Herein, we investigate the effects of the trapped interfacial icelike water layer on the charge transfer between graphene and the SiO2/Si substrate through recording the surface potential changes induced by partial removal of the interfacial icelike water layer upon in situ heating. The scanning Kelvin probe microscopy surface potential mapping shows that the graphene is electronically modified by the icelike water layer as the electron density transfers from graphene to the icelike water layer, resulting in hole-doping of graphene, which was also confirmed by the graphene field effect transistor electrical transport measurements. In addition, the density functional calculations provide in-depth insight into the electronic contributions of the icelike water layer to graphene and the charge transfer mechanism. This research will improve our ability to manipulate graphene's electronic properties for diverse applications, such as humidity sensing.
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Affiliation(s)
- Yue Hong
- Key Laboratory of Colloid and Interface Chemistry of the Ministry of Education, and School of Chemistry and Chemical Engineering, Shandong University, Shandong, Jinan 250100, China.
| | - Sanmei Wang
- Institute of Nanosurface Science and Engineering, Shenzhen University, Guangdong, Shenzhen 518060, China.
| | - Qiang Li
- Key Laboratory of Colloid and Interface Chemistry of the Ministry of Education, and School of Chemistry and Chemical Engineering, Shandong University, Shandong, Jinan 250100, China. and Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Aarhus C, DK-8000, Denmark.
| | - Xin Song
- Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Aarhus C, DK-8000, Denmark.
| | - Zegao Wang
- Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Aarhus C, DK-8000, Denmark.
| | - Xi Zhang
- Institute of Nanosurface Science and Engineering, Shenzhen University, Guangdong, Shenzhen 518060, China.
| | - Flemming Besenbacher
- Key Laboratory of Colloid and Interface Chemistry of the Ministry of Education, and School of Chemistry and Chemical Engineering, Shandong University, Shandong, Jinan 250100, China. and Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Aarhus C, DK-8000, Denmark.
| | - Mingdong Dong
- Key Laboratory of Colloid and Interface Chemistry of the Ministry of Education, and School of Chemistry and Chemical Engineering, Shandong University, Shandong, Jinan 250100, China. and Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Aarhus C, DK-8000, Denmark.
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Sun CQ, Huang Y, Zhang X. Hydration of Hofmeister ions. Adv Colloid Interface Sci 2019; 268:1-24. [PMID: 30921543 DOI: 10.1016/j.cis.2019.03.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2019] [Revised: 03/04/2019] [Accepted: 03/07/2019] [Indexed: 01/08/2023]
Abstract
Water dissolves salt into ions and then hydrates the ions to form an aqueous solution. Hydration of ions deforms the hydrogen bonding network and triggers the solution with what the pure water never shows such as conductivity, molecular diffusivity, thermal stability, surface stress, solubility, and viscosity, having enormous impact to many branches in biochemistry, chemistry, physics, and energy and environmental industry sectors. However, regulations for the solute-solute-solvent interactions are still open for exploration. From the perspective of the screened ionic polarization and O:H-O bond relaxation, this treatise features the recent progress and a perspective in understanding the hydration dynamics of Hofmeister ions in the typical YI, NaX, ZX2, and NaT salt solutions (Y = Li, Na, K, Rb, Cs; X = F, Cl, Br, I; Z = Mg, Ca, Ba, Sr; T = ClO4, NO3, HSO4, SCN). Phonon spectrometric analysis turned out the f(C) number fraction of bonds transition from the mode of deionized water to the hydrating. The linear f(C) ∝ C form features the invariant hydration volume of small cations that are fully-screened by their hydration H2O dipoles. The nonlinear f(C) ∝ 1 - exp.(-C/C0) form describes that the number insufficiency of the ordered hydrating H2O dipoles partially screens the anions. Molecular anions show stronger yet shorter electric field of dipoles. The screened ionic polarization, inter-solute interaction, and O:H-O bond transition unify the solution conductivity, surface stress, viscosity, and critical energies for phase transition.
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Sun CQ. Aqueous charge injection: solvation bonding dynamics, molecular nonbond interactions, and extraordinary solute capabilities. INT REV PHYS CHEM 2018. [DOI: 10.1080/0144235x.2018.1544446] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Chang Q. Sun
- EBEAM, Yangtze Normal University, Chongqing, People's Republic of China
- NOVITAS, EEE, Nanyang Technological University, Singapore, Singapore
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Zhang X, Chen S, Li J. Hydrogen-bond potential for ice VIII-X phase transition. Sci Rep 2016; 6:37161. [PMID: 27841335 PMCID: PMC5107924 DOI: 10.1038/srep37161] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2016] [Accepted: 10/25/2016] [Indexed: 12/02/2022] Open
Abstract
Repulsive force between the O-H bonding electrons and the O:H nonbonding pair within hydrogen bond (O-H:O) is an often overlooked interaction which dictates the extraordinary recoverability and sensitivity of water and ice. Here, we present a potential model for this hidden force opposing ice compression of ice VIII-X phase transition based on the density functional theory (DFT) and neutron scattering observations. We consider the H-O bond covalent force, the O:H nonbond dispersion force, and the hidden force to approach equilibrium under compression. Due to the charge polarization within the O:H-O bond, the curvatures of the H-O bond and the O:H nonbond potentials show opposite sign before transition, resulting in the asymmetric relaxation of H-O and O:H (O:H contraction and H-O elongation) and the H+ proton centralization towards phase X. When cross the VIII-X phase boundary, both H-O and O:H contract slightly. The potential model reproduces the VIII-X phase transition as observed in experiment. Development of the potential model may provide a choice for further calculations of water anomalies.
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Affiliation(s)
- Xi Zhang
- Institute of Nanosurface Science and Engineering & Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering, Shenzhen University, Guangdong, 518060, China
| | - Shun Chen
- School of Physics and Astronomy, the University of Manchester, Manchester, M13 9PL, UK
| | - Jichen Li
- School of Physics and Astronomy, the University of Manchester, Manchester, M13 9PL, UK
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Zhang X, Liu X, Zhong Y, Zhou Z, Huang Y, Sun CQ. Nanobubble Skin Supersolidity. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:11321-11327. [PMID: 27491270 DOI: 10.1021/acs.langmuir.6b01660] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Water nanobubbles manifest fascinatingly higher mechanical strength, higher thermal stability, and longer lifetime than macroscopic bubbles; thus, they provide an important impact in applications in the biomedical and chemical industries. However, a detailed understanding of the mechanism behind these mysteries of nanobubbles remains a challenge. Consistency between quantum computations and Raman spectrometric measurements confirmed our predictions that a nanobubble skin shares the same supersolidity with molecular clusters, skins of bulk water, and water droplets because of molecular undercoordination (fewer than four nearest molecular neighbors). Molecular undercoordination (coordination number Zcluster < Zsurface < Zbubble < Zbulk = 4) shortens/extends the H-O/O:H bond and stiffens/softens its corresponding stretching phonons, whose frequency shift is proportional to the square root of the cohesive energy and inversely proportional to the segmental length. The strongly polarized O:H-O bond slows the molecular dynamics and increases the viscosity. The freezing temperature is lowered by the softened O:H bond, and the melting temperature is enhanced by the stiffened H-O bond. Therefore, the supersolid skin makes the nanobubbles thermally more stable, less dense, and stiffer and slows the dynamics of their molecular motion.
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Affiliation(s)
- Xi Zhang
- Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering, Institute of Nanosurface Science and Engineering, Shenzhen University , Shenzhen 518060, China
| | - Xinjuan Liu
- College of Materials Science and Engineering, Institute of Coordination Bond Metrology and Engineering, China Jiliang University , Hangzhou 310018, China
| | - Yuan Zhong
- Key Laboratory of Low-Dimensional Materials and Application Technology (MOE) and School of Materials Science and Engineering, Xiangtan University , Xiangtan 411105, China
| | - Zhaofeng Zhou
- Key Laboratory of Low-Dimensional Materials and Application Technology (MOE) and School of Materials Science and Engineering, Xiangtan University , Xiangtan 411105, China
| | - Yongli Huang
- Key Laboratory of Low-Dimensional Materials and Application Technology (MOE) and School of Materials Science and Engineering, Xiangtan University , Xiangtan 411105, China
| | - Chang Q Sun
- NOVITAS, School of EEE, Nanyang Technological University , Singapore 639798, Singapore
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Zhang X, Huang Y, Sun P, Liu X, Ma Z, Zhou Y, Zhou J, Zheng W, Sun CQ. Ice Regelation: Hydrogen-bond extraordinary recoverability and water quasisolid-phase-boundary dispersivity. Sci Rep 2015; 5:13655. [PMID: 26351109 PMCID: PMC4563362 DOI: 10.1038/srep13655] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2015] [Accepted: 07/31/2015] [Indexed: 02/01/2023] Open
Abstract
Regelation, i.e., ice melts under compression and freezes again when the pressure is relieved, remains puzzling since its discovery in 1850’s by Faraday. Here we show that hydrogen bond (O:H-O) cooperativity and its extraordinary recoverability resolve this anomaly. The H-O bond and the O:H nonbond possesses each a specific heat ηx(T/ΘDx) whose Debye temperature ΘDx is proportional to its characteristic phonon frequency ωx according to Einstein’s relationship. A superposition of the ηx(T/ΘDx) curves for the H-O bond (x = H, ωH ~ 3200 cm−1) and the O:H nonbond (x = L, ωL ~ 200 cm−1, ΘDL = 198 K) yields two intersecting temperatures that define the liquid/quasisolid/solid phase boundaries. Compression shortens the O:H nonbond and stiffens its phonon but does the opposite to the H-O bond through O-O Coulomb repulsion, which closes up the intersection temperatures and hence depress the melting temperature of quasisolid ice. Reproduction of the Tm(P) profile clarifies that the H-O bond energy EH determines the Tm with derivative of EH = 3.97 eV for bulk water and ice. Oxygen atom always finds bonding partners to retain its sp3-orbital hybridization once the O:H breaks, which ensures O:H-O bond recoverability to its original state once the pressure is relieved.
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Affiliation(s)
- Xi Zhang
- Institute of Coordination Bond Metrology and Engineering, College of Materials Science and Engineering, China Jiliang University, Hangzhou 310018, China.,Institute of Nanosurface Science and Engineering, Shenzhen University, Shenzhen 518060, China
| | - Yongli Huang
- Key Laboratory of Low-dimensional Materials and Application Technology (MOE) and School of Materials Science and Engineering, Xiangtan University, Xiangtan, 411105, China
| | - Peng Sun
- Institute of Coordination Bond Metrology and Engineering, College of Materials Science and Engineering, China Jiliang University, Hangzhou 310018, China
| | - Xinjuan Liu
- Institute of Coordination Bond Metrology and Engineering, College of Materials Science and Engineering, China Jiliang University, Hangzhou 310018, China
| | - Zengsheng Ma
- Key Laboratory of Low-dimensional Materials and Application Technology (MOE) and School of Materials Science and Engineering, Xiangtan University, Xiangtan, 411105, China
| | - Yichun Zhou
- Key Laboratory of Low-dimensional Materials and Application Technology (MOE) and School of Materials Science and Engineering, Xiangtan University, Xiangtan, 411105, China
| | - Ji Zhou
- State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
| | - Weitao Zheng
- School of Materials Science, Jilin University, Changchun 130012, China
| | - Chang Q Sun
- NOVITAS, School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798
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Huang YL, Zhang X, Ma Z, Zhou G, Sun CQ, Gong YY. Potential Paths for the Hydrogen-Bond Relaxing With (H 2O) NCluster Size. J Phys Chem A 2015. [DOI: 10.1021/acs.jpca.5b03921] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Huang YL, Zhang X, Ma Z, Zhou G, Sun CQ, Gong YY. Potential Paths for the Hydrogen-Bond Relaxing With (H 2O) N Cluster Size. J Phys Chem A 2015; 119:16962-16971. [PMID: 26119068 DOI: 10.1021/acs.jpcc.5b03921] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Relaxation of the inter- and intra-molecular interactions for the hydrogen bond (O:H-O) between undercoordinated molecules determines the unusual behavior of water nanodroplets and nanobubbles. However, probing such potentials remains unreality. Here we show that the Lagrangian solution [Huang et al., J. Phys. Chem. B, 2013. 117: 13639] transforms the observed H-O bond (x = H) and O:H nonbond (x = L) lengths and phonon frequencies (dx, x) [Sun et al., J. Phys. Chem. Lett., 2013. 4: 2565] into the respective force constants and bond energies (kx, Ex) and hence enables the mapping of the potential paths for the O:H-O bond relaxing with water cluster size. Results show that molecular undercoordination not only reduces the molecular size (dH) with enhanced H-O energy from the bulk value of 3.97 to 5.10 eV for a H2O monomer, but also enlarges the molecular separation (dL) with reduced O:H energy from 95 to 35 meV for a dimer. The H-O energy gain raises the melting point from bulk value 273 to 310 K for the skin and the O:H energy loss lowers the freezing temperature from bulk value 258 to 202 K for 1.4 nm sized droplet, by dispersing the quasisolid phase boundaries.
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