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Huang C, Yang Y, Li M, Qi X, Pan C, Guo K, Bao L, Lu X. Ultrahigh Capacity from Complexation-Enabled Aluminum-Ion Batteries with C 70 as the Cathode. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2306244. [PMID: 37815787 DOI: 10.1002/adma.202306244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Revised: 09/28/2023] [Indexed: 10/11/2023]
Abstract
Restricted by the available energy storage modes, currently rechargeable aluminum-ion batteries (RABs) can only provide a very limited experimental capacity, regardless of the very high gravimetric capacity of Al (2980 mAh g-1 ). Here, a novel complexation mechanism is reported for energy storage in RABs by utilizing 0D fullerene C70 as the cathode. This mechanism enables remarkable discharge voltage (≈1.65 V) and especially a record-high reversible specific capacity (750 mAh g-1 at 200 mA g-1 ) of RABs. By means of in situ Raman monitoring, mass spectrometry, and density functional theory (DFT) calculations, it is found that this elevated capacity is attributed to the direct complexation of one C70 molecule with 23.5 (super)halogen moieties (superhalogen AlCl4 and/or halogen Cl) in average, forming (super)halogenated C70 ·(AlCl4 )m Cln-m complexes. Upon discharging, decomplexation of C70 ·(AlCl4 )m Cln-m releases AlCl4 - /Cl- ions while preserving the intact fullerene cage. This work provides a new route to realize high-capacity and long-life batteries following the complexation mechanism.
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Affiliation(s)
- Chenli Huang
- State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, 1037, Luoyu Road, Wuhan, 430074, P. R. China
| | - Ying Yang
- Institute of New Energy for Vehicles, School of Materials Science and Engineering, Tongji University, Shanghai, 201804, P. R. China
| | - Mengyang Li
- School of Physics, Xidian University, Xi'an, 710071, P. R. China
| | - Xiaoqun Qi
- State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, 1037, Luoyu Road, Wuhan, 430074, P. R. China
| | - Changwang Pan
- State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, 1037, Luoyu Road, Wuhan, 430074, P. R. China
| | - Kun Guo
- State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, 1037, Luoyu Road, Wuhan, 430074, P. R. China
| | - Lipiao Bao
- State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, 1037, Luoyu Road, Wuhan, 430074, P. R. China
| | - Xing Lu
- State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, 1037, Luoyu Road, Wuhan, 430074, P. R. China
- School of Chemistry and Chemical Engineering, Hainan University, No. 58, Renmin Avenue, Haikou, 570228, P.R.China
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Sikorska C. Design and Investigation of Superatoms for Redox Applications: First-Principles Studies. MICROMACHINES 2023; 15:78. [PMID: 38258197 PMCID: PMC10820084 DOI: 10.3390/mi15010078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2023] [Revised: 12/22/2023] [Accepted: 12/27/2023] [Indexed: 01/24/2024]
Abstract
A superatom is a cluster of atoms that acts like a single atom. Two main groups of superatoms are superalkalis and superhalogens, which mimic the chemistry of alkali and halogen atoms, respectively. The ionization energies of superalkalis are smaller than those of alkalis (<3.89 eV for cesium atom), and the electron affinities of superhalogens are larger than that of halogens (>3.61 eV for chlorine atom). Exploring new superalkali/superhalogen aims to provide reliable data and predictions of the use of such compounds as redox agents in the reduction/oxidation of counterpart systems, as well as the role they can play more generally in materials science. The low ionization energies of superalkalis make them candidates for catalysts for CO2 conversion into renewable fuels and value-added chemicals. The large electron affinity of superhalogens makes them strong oxidizing agents for bonding and removing toxic molecules from the environment. By using the superatoms as building blocks of cluster-assembled materials, we can achieve the functional features of atom-based materials (like conductivity or catalytic potential) while having more flexibility to achieve higher performance. This feature paper covers the issues of designing such compounds and demonstrates how modifications of the superatoms (superhalogens and superalkalis) allow for the tuning of the electronic structure and might be used to create unique functional materials. The designed superatoms can form stable perovskites for solar cells, electrolytes for Li-ion batteries of electric vehicles, superatomic solids, and semiconducting materials. The designed superatoms and their redox potential evaluation could help experimentalists create new materials for use in fields such as energy storage and climate change.
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Affiliation(s)
- Celina Sikorska
- Faculty of Chemistry, University of Gdańsk, Fahrenheit Union of Universities in Gdańsk, Wita Stwosza 63, 80-308 Gdańsk, Poland;
- Department of Physics, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
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Srivastava AK. Recent progress on the design and applications of superhalogens. Chem Commun (Camb) 2023; 59:5943-5960. [PMID: 37128706 DOI: 10.1039/d3cc00428g] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
The research on superhalogens has successfully completed four decades. After their prediction in 1981 and experimental verification in 1999, such species have attracted attention due to their unusual structures and intriguing applications. Superhalogens are species whose electron affinity exceeds that of halogen or whose anions possess a larger vertical detachment energy than that of halides. Initially, these species were designed using s and p block atoms having a central electropositive atom as the core with excess electronegative atoms as ligands such as F, Cl, O etc. The last decade has witnessed enormous progress in the field of superhalogens. The transition metal atoms have played the role of the central core and a variety of new ligands have been explored. Further, new classes of superhalogens such as polynuclear superhalogens, magnetic superhalogens, aromatic superhalogens, etc. have been reported. The first application of superhalogens as strong oxidizers appeared much before their conceptualization. In the last decade, however, their applications have spanned a variety of fields such as energy storage, superacids, organic superconductors, ionic liquids, liquid crystals, etc. This makes research in the field of superhalogens truly interdisciplinary. This article is intended to highlight the progress on the design and applications of superhalogens in the last decade.
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Affiliation(s)
- Ambrish Kumar Srivastava
- Department of Physics, Deen Dayal Upadhyaya Gorakhpur University, Gorakhpur, 223009, Uttar Pradesh, India.
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Miller A, Halstead M, Besley E, Stace AJ. Designing stable binary endohedral fullerene lattices. Phys Chem Chem Phys 2022; 24:10044-10052. [PMID: 35415738 DOI: 10.1039/d2cp00196a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Nanoparticle lattices and endohedral fullerenes have both been identified as potential building blocks for future electronic, magnetic and optical devices; here it is proposed that it could be possible to combine those concepts and design stable nanoparticle lattices composed from binary collections of endohedral fullerenes. The inclusion of an atom, for example Ca or F, within a fullerene cage is known to be accompanied by a redistribution of surface charge, whereby the cage can acquire either a negative (Ca) or positive (F) charge. From calculations involving a combination of van der Waals and many-body electrostatic interactions, it is predicted that certain binary combinations, for example a metal (A) and a halogen (B), could result in the formation of stable nanoparticle lattices with the familiar AB and AB2 stoichiometries. Much of the stability is due to Coulomb interactions, however, charge-induced and van der Waals interactions, which always enhance stability, are found to extend the range of charge on a cage over which lattices are stable. Some lattice types are shown to be three or four times more stable than an equivalent neutral C60 structure. An extension of the calculations to the fabrication of structures involving endohedral C84 is also discussed.
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Affiliation(s)
- Abigail Miller
- School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, UK.
| | - Matthew Halstead
- School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, UK.
| | - Elena Besley
- School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, UK.
| | - Anthony J Stace
- School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, UK.
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Sikorska C, Gaston N. Molecular crystals vs. superatomic lattice: a case study with superalkali-superhalogen compounds. Phys Chem Chem Phys 2022; 24:8763-8774. [PMID: 35352731 DOI: 10.1039/d1cp05761h] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Using a first-principles approach, we study the assembly of atomically-precise cluster solids with atomic precision. The aims are to create binary assemblies of clusters through charge transfer between neutral molecular clusters, and employing intercluster electrostatic attraction as a driving force for co-assembly. We combined pairs of complementary clusters in which one cluster is electron-donating (superalkali) and the other is electron-accepting (superhalogen). From the analysis of the binding energy between superatomic counterparts, charge transfer, and the relative size of the clusters, we analyze the resulting structures as either molecular crystals or superatomic lattices. We demonstrate that the substitution of a single atom can result in minor changes to the crystal structure of the binary solids or entirely new packing structures. The [N4Mg6Li]+[AlCl4]-, [N4Mg6Na]+[AlCl4]-, [N4Mg6K]+[AlCl4]-, [N4Mg6Li]+[AlF4]-, [N4Mg6Na]+[AlF4]-, and [N4Mg6K]+[AlF4]- compounds all form the same close-packed superatomic lattice structure through halogen bonding, with subtle differences in the orientation of the superatoms. These salts may also form molecular crystals where clusters are held to one another by electrostatic interactions. Our results emphasize how the structure of superatomic solids can be tuned upon single atom substitution.
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Affiliation(s)
- Celina Sikorska
- The MacDiarmid Institute for Advanced Materials and Nanotechnology, Department of Physics, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand.
| | - Nicola Gaston
- The MacDiarmid Institute for Advanced Materials and Nanotechnology, Department of Physics, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand.
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Anila S, Suresh CH. Imidazolium-fulleride ionic liquids - a DFT prediction. Phys Chem Chem Phys 2021; 23:20086-20094. [PMID: 34515268 DOI: 10.1039/d1cp03455c] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Ionic liquids (ILs) exhibit tunable physicochemical properties due to the flexibility of being able to select their cation-anion combination from a large pool of ions. The size of the ions controls the properties of the ILs in the range from ionic to molecular, and thus large ions play an important role in regulating the melting temperature and viscosity. Here, we show that the exohedral addition of anionic X- moieties to C60 (X = H, F, OH, CN, NH2, and NO2) is a thermodynamically viable process for creating large X-fulleride anions (C60X)-. The addition of X- to C60 is modelled by locating the transition state for the reaction between C60 and 1,3-dimethyl-2X-imidazole (IMX) at the M06L/6-311++G(d,p)//M06L/6-31G(d,p) level. The reaction yields the ion-pair complex IM+⋯(C60X)- for X = H, F, OH, CN, NH2, and NO2 and the ordered pair of (activation free energy, reaction free energy) is found to be (14.5, 1.1), (6.1, 3.1), (16.7, 2.3), (14.7, -7.9), (27.9, 0.5) and (11.9, 12.4), respectively. The low barrier of the reactions suggests their feasibility. The reaction is slightly endergonic for X = H, F, OH, and NH2, while X = CN shows a significant exergonic character. The X-fulleride formation is not observed when X = Cl and Br. The ion-pair interactions (Eion-pair) observed for IM+⋯(C60X)- range from -64.0 to -73.0 kcal mol-1, which is substantially lower (∼10%) than the typically reported values for imidazolium-based ionic liquids such as [EMIm]+[trz]-, [EMIm]+[dc]-, [EMIm]+[dtrz]-, and [EMIm]+[NH2tz]-. The quantum theory of atoms in molecules (QTAIM) analysis showed that the C-X bonding in (C60X)- is covalent, while that in (IM+⋯X-)⋯C60 (for X = Cl and Br) is non-covalent. Furthermore, molecular electrostatic potential (MESP) analysis showed that the X-fulleride could behave as a large spherical anion due to the delocalization of the excess electron in the system over the entire carbon framework. The large anionic character of the X-fulleride is also revealed by the identification of several close lying local energy minima for the IM+⋯(C60X)- ion-pair. The low Eion-pair value, the significant contribution of dispersion to the Eion-pair and the spherical nature of the anion predict low-melting point and highly viscous IL formation from X-fullerides and the imidazolium cation.
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Affiliation(s)
- Sebastian Anila
- Chemical Sciences and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology, Thiruvananthapuram, Kerala, 695 019, India. .,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Cherumuttathu H Suresh
- Chemical Sciences and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology, Thiruvananthapuram, Kerala, 695 019, India. .,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
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Xue D, Chen Z, Liu J, Liu J, Wu D, Li Y, Li Z. Oxidization of aromatic heterocyclic molecules with superhalogens. Polyhedron 2021. [DOI: 10.1016/j.poly.2021.115160] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Sikorska C, Gaston N. Modified Lennard-Jones potentials for nanoscale atoms. J Comput Chem 2020; 41:1985-2000. [PMID: 32592415 DOI: 10.1002/jcc.26368] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Revised: 04/29/2020] [Accepted: 05/31/2020] [Indexed: 01/05/2023]
Abstract
A classical 6-12 Lennard-Jones (LJ) equation has been widely used to model materials and is the potential of choice in studies when the focus is on fundamental issues. Here we report a systematic study comparing the pair interaction potentials within solid-state materials (i.e., [Co6 Se8 (PEt3 )6 ][C60 ]2 , [Cr6 Te8 (PEt3 )6 ][C60 ]2 , [Ni9 Te6 (PEt3 )8 ][C60 ]) using density functional theory (DFT) calculations and LJ parametrization. Both classical (6-12 LJ) and modified LJ (mLJ) models were developed. In the mLJ approach, the exponents 6 and 12 are replaced by different integer number n and 2n, respectively, and an additional parameter (α) is introduced to describe intermolecular distance shift arising within the geometric centers' approach (instead of the shortest interatomic distance between particles). A general LJ approach reexamination reveals that in the case of nanoatoms, the attractive term decays with distance as the inverse fourth power, and the dominating at short distances repulsive term decays as the inverse eighth power. The modification of the LJ equation is even more prominent for interaction profiles, where intermolecular distance corresponds to separation between geometric centers of particles. In this approach, the attractive term decays with distance as the inverse 12th power, while the repulsive term decays rapidly (as the inverse 24th power). Thus, the mLJ models (e.g., 4-8 LJ) rather than the 6-12 classical ones seem to be a better choice for the description of binary interactions of nanoatoms. The developed mLJ models and electronic structure characteristics give an insight into the explanation of the unique physicochemical properties of superatomic-based solid-state materials.
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Affiliation(s)
- Celina Sikorska
- Department of Physics, The MacDiarmid Institute for Advanced Materials and Nanotechnology, The University of Auckland, Auckland, New Zealand
| | - Nicola Gaston
- Department of Physics, The MacDiarmid Institute for Advanced Materials and Nanotechnology, The University of Auckland, Auckland, New Zealand
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Potassium iodide cluster based superhalogens and superalkalis: Theoretical calculations and experimental confirmation. Chem Phys Lett 2020. [DOI: 10.1016/j.cplett.2020.137094] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Sikorska C. Magnesium-Based Clusters as Building Blocks of Electrolytes in Lithium-Ion Batteries. Chemphyschem 2019; 20:2236-2246. [PMID: 31309658 DOI: 10.1002/cphc.201900318] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2019] [Revised: 05/30/2019] [Indexed: 11/06/2022]
Abstract
Superhalogens, owing to their large electron affinity (EA, exceeding those of any halogen atom), play an essential role in physical chemistry as well as new material design. They have applications in hydrogen storage and lithium-ion batteries. Owing to the unique geometries and electronic features of magnesium-based clusters, their potential to form a new class of lithium salts has been investigated here theoretically. The idea is assessed by conducting ab initio computations on Li+ /Mgn F2n+1-2m Om - compounds (n=2, 3; m=0-3) and analyzing their performance as potential Li-ion battery electrolytes. The Mg3 F7 - cluster, with large electron binding energy (EA of 7.93 eV), has been proven to serve as a building block for lithium salts. It is shown that, apart from high electronic stability, the new superhalogen-based electrolytes exhibit a set of desirable properties, including a large band gap, high electrolyte stability window, easy mobility of the Li+ , and favorable insensitivity to water.
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Affiliation(s)
- Celina Sikorska
- Laboratory of Molecular Modeling Department of Theoretical Chemistry Faculty of Chemistry, University of Gdansk Wita Stwosza 63, 80-308, Gdansk, Poland.,MacDiarmid Institute for Advanced Materials and Nanotechnology Department of Physics, The University of Auckland, 38 Princes Street, Auckland, 1010, New Zealand
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Sikorska C. Magnesium-Based Oxyfluoride Superatoms: Design, Structure, and Electronic Properties. J Chem Inf Model 2019; 59:2175-2189. [PMID: 30892029 DOI: 10.1021/acs.jcim.9b00083] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The ability of mixed ligands to form stable dinuclear and trinuclear magnesium-based superatoms has been investigated theoretically. The Mg2F5-2 mO m and Mg3F7-2 mO m systems (where m = 1-3) were found able to form stable and strongly bound anionic clusters, and those assumptions were validated by (i) the analysis of the geometrical stability; (ii) the estimated Gibbs free energies for the most probable disproportion paths these clusters might be vulnerable to (which allows examining their thermodynamic stabilities); (iii) the localization of the electron density; and (iv) the adiabatic electron affinity (AEA), vertical electron detachment energy (VDE), and adiabatic electron detachment energy (ADE) values calculated for the studied systems. It is demonstrated that the stability of the anionic daughters of these clusters increases with the number of electronegative ligands, and Mg nF2 n+1-2 mO m- ( n = 2, 3; m = 1-3) clusters are stable against electron emission. The largest electron binding energy was found for the Mg3F5O- anion (VDE = 6.826 eV). The strong VDE dependence on (i) the geometrical structure, (ii) the number of central atoms, (iii) ligand type, and (iv) bonding/antibonding character of the highest molecular orbital (HOMO) was also remarked upon and discussed.
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Affiliation(s)
- Celina Sikorska
- Laboratory of Molecular Modeling, Department of Theoretical Chemistry, Faculty of Chemistry , University of Gdansk , Wita Stwosza 63 , 80-308 Gdansk , Poland
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Sikorska C. Oxidizing Metal Oxides with Polynuclear Superhalogen: An ab Initio Study. J Phys Chem A 2018; 122:7328-7338. [PMID: 30142273 DOI: 10.1021/acs.jpca.8b05095] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The ability of metal oxides (CoO, CuO, MgO, MnO2, NiO, SiO2, TiO2, and ZnO) to form stable systems with polynuclear superhalogen (i.e., Mg3F7) is examined on the basis of theoretical considerations supported by ab initio calculations. It is demonstrated that the MeO n ( n = 1, 2) molecules (such as CoO, CuO, MgO, MnO2, NiO, TiO2, ZnO) should form stable and strongly bound (MeO n)+(superhalogen)- salts when combined with the Mg3F7 superhalogen radical (acting as an oxidizing agent). This conclusion is supported by providing: (i) structural deformation of superhalogen upon ionization, (ii) predicted charge flow between each MeO n and superhalogen (which allows estimating the amount of electron density withdrawn from MeO n molecule during the ionization process), (iii) the localization of the spin density distribution, and (iv) the interaction energies and vertical ionization potentials (VIPs) for the compounds obtained at the CCSD(T)/6-311+G(d) level of theory. On the other hand, the Mg3F7 superhalogen was found to be incapable of ionizing molecules whose adiabatic ionization potentials (AIPs) exceed 12 eV (e.g., SiO2). I believe that the results provided in this contribution may likely be of prospective relevance in the future studies on the issue of binding and preventing metal oxide nanoparticles aggregation in the environment before they occur harmful to human health and environment.
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Affiliation(s)
- Celina Sikorska
- Laboratory of Molecular Modeling, Department of Theoretical Chemistry, Faculty of Chemistry , University of Gdansk Wita Stwosza 63 , 80-308 Gdansk , Poland
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Paszkiewicz M, Sikorska C, Leszczyńska D, Stepnowski P. Helical Multi-walled Carbon Nanotubes as an Efficient Material for the Dispersive Solid-Phase Extraction of Low and High Molecular Weight Polycyclic Aromatic Hydrocarbons from Water Samples: Theoretical Study. WATER, AIR, AND SOIL POLLUTION 2018; 229:253. [PMID: 30237636 PMCID: PMC6133110 DOI: 10.1007/s11270-018-3884-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2018] [Accepted: 06/20/2018] [Indexed: 05/17/2023]
Abstract
The differences in effectiveness of multi-walled carbon nanotubes (MWCNTs) as the dispersive solid-phase extraction (dSPE) sorbent for the selective extraction of polycyclic aromatic hydrocarbons (PAHs) were explained on the basis of theoretical study. It was observed that for low molecular weight PAHs, the recoveries using non-helical and helical MWCNTs were similar. In contrary, for PAHs containing five or more aromatic rings, the extraction efficiency was higher using HMWCNTs than for non-helical ones. Principle component analysis (PCA) as well as providing structural parameters and interaction energies for adsorption processes (PAH + CNT → PAH-CNT) have been used for this purpose. All the PAH + CNT → PAH-CNT adsorption processes considered were found to be thermodynamically favorable. However, the adsorption energies (Eads) for PAHs and the helical carbon nanotube surface estimated for the B(a)P-HCNT and I(1,2,3-cd)P-HCNT are substantially less negative than those observed for PAH molecules interacting with the non-helical CNT. Namely, the Eads calculated in simulated aqueous environment for the B(a)P-MWCNT(6,2) and I(1,2,3-cd)P-MWCNT(6,2) were respectively - 43.32 and - 59.98 kcal/mol, while values of only - 7.75 kcal/mol (B(a)P-HCNT) and - 9.13 kcal/mol (I(1,2,3-cd)P-HCNT) were found for the corresponding PAH-HCNT systems. Therefore, we conclude that the replacement of MWCNTs with HCNTs leads to PAH-HCNT systems in which the interaction energies are much smaller than those estimated for the corresponding PAH-MWCNT systems. HMWCNTs are therefore recommended as the dSPE sorbent phase for the extraction of both low and high molecular weight PAHs from water samples.
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Affiliation(s)
- Monika Paszkiewicz
- Department of Environmental Analysis, Faculty of Chemistry, University of Gdansk, Wita Stwosza 63, 80-308 Gdansk, Poland
- Department of Civil and Environmental Engineering, Interdisciplinary Nanotoxicity Center, Jackson State University, 1400 John R. Lynch Street, Jackson, MS 39217 USA
| | - Celina Sikorska
- Laboratory of Molecular Modeling, Department of Theoretical Chemistry, Faculty of Chemistry, University of Gdansk, Wita Stwosza 63, 80-308 Gdansk, Poland
| | - Danuta Leszczyńska
- Department of Civil and Environmental Engineering, Interdisciplinary Nanotoxicity Center, Jackson State University, 1400 John R. Lynch Street, Jackson, MS 39217 USA
| | - Piotr Stepnowski
- Department of Environmental Analysis, Faculty of Chemistry, University of Gdansk, Wita Stwosza 63, 80-308 Gdansk, Poland
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Srivastava AK, Kumar A, Misra N. Superalkali@C60−superhalogen: Structure and nonlinear optical properties of a new class of endofullerene complexes. Chem Phys Lett 2017. [DOI: 10.1016/j.cplett.2017.05.070] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Wyrzykowska E, Mikolajczyk A, Sikorska C, Puzyn T. Development of a novel in silico model of zeta potential for metal oxide nanoparticles: a nano-QSPR approach. NANOTECHNOLOGY 2016; 27:445702. [PMID: 27668939 DOI: 10.1088/0957-4484/27/44/445702] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Once released into the aquatic environment, nanoparticles (NPs) are expected to interact (e.g. dissolve, agglomerate/aggregate, settle), with important consequences for NP fate and toxicity. A clear understanding of how internal and environmental factors influence the NP toxicity and fate in the environment is still in its infancy. In this study, a quantitative structure-property relationship (QSPR) approach was employed to systematically explore factors that affect surface charge (zeta potential) under environmentally realistic conditions. The nano-QSPR model developed with multiple linear regression (MLR) was characterized by high robustness [Formula: see text] and external predictivity [Formula: see text] The results clearly showed that zeta potential values varied markedly as functions of the ionic radius of the metal atom in the metal oxides, confirming that agglomeration and the extent of release of free MexOy largely depend on their intrinsic properties. A developed nano-QSPR model was successfully applied to predict zeta potential in an ionized solution of NPs for which experimentally determined values of response have been unavailable. Hence, the application of our model is possible when the values of zeta potential in the ionized solution for metal oxide nanoparticles are undetermined, without the necessity of performing more time consuming and expensive experiments. We believe that our studies will be helpful in predicting the conditions under which MexOy is likely to become problematic for the environment and human health.
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Affiliation(s)
- Ewelina Wyrzykowska
- Laboratory of Environmental Chemometrics, Faculty of Chemistry, University of Gdansk, Poland
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Abstract
The NgF6n+1− (Ng = Xe, Rn) anions exhibit much larger vertical detachment energies than the EA of halogen elements, confirming their superhalogen identities.
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Affiliation(s)
- Celina Sikorska
- Laboratory of Molecular Modeling
- Department of Theoretical Chemistry
- Faculty of Chemistry
- University of Gdansk
- 80-308 Gdansk
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