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Skoblin АА, Mikhaleva MG, Voronina LI, Stovbun SV. On the mechanism of effectively chiral-pure macromolecular spiralization induced by a weakly chiral polarized heterochiral solution of a chiral compound. Chirality 2021; 33:315-320. [PMID: 33876853 DOI: 10.1002/chir.23311] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Revised: 01/25/2021] [Accepted: 03/05/2021] [Indexed: 11/09/2022]
Abstract
There has been made an assumption, correlating with experimental data, that the phenomenon of effectively chiral-pure, chiral-induced spiralization of macromolecules in weakly polarized heterochiral solutions is determined by the mechanism of physico-chemical annihilation: enantiomers-antipodes of a chiral compound in a heterochiral solution annihilate; that is, they form achiral dimers, the solution becomes effectively homochiral and further, chiral-induced macromolecular spiralization of one sign of helicity is realized in it in the same way as in other homochiral solutions.
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Affiliation(s)
- Аleksey А Skoblin
- Laboratory of Chemical Physics Of Biosystems, N.N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, Moscow, Russia
| | - Maria G Mikhaleva
- Laboratory of Chemical Physics Of Biosystems, N.N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, Moscow, Russia
| | - Lyubov I Voronina
- Laboratory of Chemical Physics Of Biosystems, N.N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, Moscow, Russia
| | - Sergey V Stovbun
- Laboratory of Chemical Physics Of Biosystems, N.N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, Moscow, Russia
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Shil S, Sen S. Cobaltocene-Coupled Cumulene: A Perspective on Chiral Magnet and Spintronics Device Design. Inorg Chem 2020; 59:16905-16912. [DOI: 10.1021/acs.inorgchem.0c01825] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Suranjan Shil
- Manipal Centre for Natural Sciences, Centre of Excellence, Manipal Academy of Higher Education, Manipal, Karnataka 576104, India
| | - Sabyasachi Sen
- Department of Physics, JIS College of Engineering, Block-A, Phase-III, Nadia, Kalyani, West Bengal 741235, India
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Elton DC, Spencer PD, Riches JD, Williams ED. Exclusion Zone Phenomena in Water-A Critical Review of Experimental Findings and Theories. Int J Mol Sci 2020; 21:E5041. [PMID: 32708867 PMCID: PMC7404113 DOI: 10.3390/ijms21145041] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2020] [Revised: 06/27/2020] [Accepted: 07/13/2020] [Indexed: 12/29/2022] Open
Abstract
The existence of the exclusion zone (EZ), a layer of water in which plastic microspheres are repelled from hydrophilic surfaces, has now been independently demonstrated by several groups. A better understanding of the mechanisms which generate EZs would help with understanding the possible importance of EZs in biology and in engineering applications such as filtration and microfluidics. Here we review the experimental evidence for EZ phenomena in water and the major theories that have been proposed. We review experimental results from birefringence, neutron radiography, nuclear magnetic resonance, and other studies. Pollack theorizes that water in the EZ exists has a different structure than bulk water, and that this accounts for the EZ. We present several alternative explanations for EZs and argue that Schurr's theory based on diffusiophoresis presents a compelling alternative explanation for the core EZ phenomenon. Among other things, Schurr's theory makes predictions about the growth of the EZ with time which have been confirmed by Florea et al. and others. We also touch on several possible confounding factors that make experimentation on EZs difficult, such as charged surface groups, dissolved solutes, and adsorbed nanobubbles.
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Affiliation(s)
- Daniel C Elton
- Radiology and Imaging Sciences, National Institutes of Health Clinical Center, Bethesda, MD 20892, USA
| | - Peter D Spencer
- School of Biomedical Sciences, Faculty of Health, Institute of Health and Biomedical Innovation, Queensland University of Technology (QUT), Brisbane, QLD 4059, Australia
| | - James D Riches
- School of Earth, Environmental and Biological Sciences, Science and Engineering Faculty, Institute for Future Environments, QUT, Brisbane, QLD 4000, Australia
| | - Elizabeth D Williams
- School of Biomedical Sciences, Faculty of Health, Institute of Health and Biomedical Innovation, QUT, Australian Prostate Cancer Research Centre-Queensland, Translational Research Institute, Brisbane, QLD 4059, Australia
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Ghosh S, Mishra S, Avigad E, Bloom BP, Baczewski LT, Yochelis S, Paltiel Y, Naaman R, Waldeck DH. Effect of Chiral Molecules on the Electron's Spin Wavefunction at Interfaces. J Phys Chem Lett 2020; 11:1550-1557. [PMID: 32013436 PMCID: PMC7307953 DOI: 10.1021/acs.jpclett.9b03487] [Citation(s) in RCA: 44] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2019] [Accepted: 02/04/2020] [Indexed: 05/19/2023]
Abstract
Kelvin-probe measurements on ferromagnetic thin film electrodes coated with self-assembled monolayers of chiral molecules reveal that the electron penetration from the metal electrode into the chiral molecules depends on the ferromagnet's magnetization direction and the molecules' chirality. Electrostatic potential differences as large as 100 mV are observed. These changes arise from the applied oscillating electric field, which drives spin-dependent charge penetration from the ferromagnetic substrate to the chiral molecules. The enantiospecificity of the response is studied as a function of the magnetization strength, the magnetization direction, and the handedness and length of the chiral molecules. These new phenomena are rationalized in terms of the chiral-induced spin selectivity (CISS) effect, in which one spin orientation of electrons from the ferromagnet penetrates more easily into a chiral molecule than does the other orientation. The large potential changes (>kT at room temperature) manifested here imply that this phenomenon is important for spin transport in chiral spintronic devices and for magneto-electrochemistry of chiral molecules.
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Affiliation(s)
- Supriya Ghosh
- Chemistry
Department, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Suryakant Mishra
- Department
of Chemical and Biological Physics, Weizmann
Institute, Rehovot 76100, Israel
| | - Eytan Avigad
- Applied
Physics Department, the Hebrew University
of Jerusalem, Jerusalem 91904, Israel
| | - Brian P. Bloom
- Chemistry
Department, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - L. T. Baczewski
- Magnetic
Heterostructures Laboratory, Institute of Physics, Polish Academy of Sciences, Al. Lotnikow 32/46, 02-668 Warszawa, Poland
| | - Shira Yochelis
- Applied
Physics Department, the Hebrew University
of Jerusalem, Jerusalem 91904, Israel
| | - Yossi Paltiel
- Applied
Physics Department, the Hebrew University
of Jerusalem, Jerusalem 91904, Israel
| | - Ron Naaman
- Department
of Chemical and Biological Physics, Weizmann
Institute, Rehovot 76100, Israel
| | - David H. Waldeck
- Chemistry
Department, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
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5
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New chemical-physical properties of water after iterative procedure using hydrophilic polymers: The case of paper filter. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.111808] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Pedregal-Cortés R, Toriz G, Delgado E, Pollack GH. Interfacial water and its potential role in the function of sericin against biofouling. BIOFOULING 2019; 35:732-741. [PMID: 31468985 DOI: 10.1080/08927014.2019.1653863] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2018] [Revised: 08/03/2019] [Accepted: 08/05/2019] [Indexed: 06/10/2023]
Abstract
Silk sericin is a globular protein whose resistance against fouling is important for applications in biomaterials and water-purification membranes. Here it is shown how sericin generates a water-exclusion zone that may facilitate antifouling behavior. Negatively charged microspheres were used to mimic the surface charge and hydrophobic domains in bacteria. Immersed in water, regenerated silk sericin formed a 100-µm-sized exclusion zone (for micron-size foulants), along with a proton gradient with a decrease of >2 pH-units. Thus, when in contact with sericin, water molecules near the surface restructure to form a physical exclusionary barrier that might prevent biofouling. The decreased pH turns the aqueous medium unviable for neutrophilic bacteria. Therefore, resistance to biofouling seems explainable, among other factors, on the basis of water-exclusionary phenomena. Furthermore, sericin may play a role in triggering the fibroin assembly process by lowering the pH to the required value.
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Affiliation(s)
- Ricardo Pedregal-Cortés
- Departamento de Madera, Celulosa y Papel, Universidad de Guadalajara , Zapopan , Jalisco , Mexico
| | - Guillermo Toriz
- Instituto Transdiciplinar de Investigación y Servicios/Departamento de Madera, Celulosa y Papel, Universidad de Guadalajara , Zapopan , Jalisco , México
| | - Ezequiel Delgado
- Departamento de Madera, Celulosa y Papel, Universidad de Guadalajara , Zapopan , Jalisco , Mexico
| | - Gerald H Pollack
- Department of Bioengineering, University of Washington , Seattle , WA , USA
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