Magnetochemistry

Research

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11 pages, 2494 KiB

Open AccessArticle

Radiation-Induced Effect on Spin-Selective Electron Transfer through Self-Assembled Monolayers of ds-DNA

by Neeraj Bangruwa, Manish Srivastava and Debabrata Mishra

Magnetochemistry 2021, 7(7), 98; https://doi.org/10.3390/magnetochemistry7070098 - 8 Jul 2021

Cited by 5 | Viewed by 2889

Abstract

Stability of the DNA molecule is essential for the proper functioning and sustainability of all living organisms. In this study, we investigate the effect of gamma radiation (γ-radiation) on spin-selective electron transfer through double strand (ds)DNA molecules. Self-assembled monolayers (SAMs) of 21-base long [...] Read more.

Stability of the DNA molecule is essential for the proper functioning and sustainability of all living organisms. In this study, we investigate the effect of gamma radiation (γ-radiation) on spin-selective electron transfer through double strand (ds)DNA molecules. Self-assembled monolayers (SAMs) of 21-base long DNA are prepared on Au-coated Ni thin film. We measure the spin polarization (%) of the SAMs of ds-DNA using the spin-dependent electrochemical technique. We use a Cs-based γ-radiation source to expose the SAMs of ds-DNA immobilized on thin films for various time intervals ranging from 0–30 min. The susceptibility of DNA to γ-radiation is measured by spin-dependent electrochemistry. We observe that the efficiency of spin filtering by ds-DNA gradually decreases when exposure (to γ-radiation) time increases, and drops below 1% after 30 min of exposure. The change in spin polarization value is related either to the conformational perturbation in DNA or to structural damage in DNA molecules caused by ionizing radiation. Full article

(This article belongs to the Special Issue Applications of Magnetization and Polarization for Molecules and Materials)

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18 pages, 17952 KiB

Open AccessArticle

Influence of Magnetic Field on the Electrodeposition and Capacitive Performances of MnO₂

by Aldo Girimonte, Andrea Stefani, Massimo Innocenti, Claudio Fontanesi and Roberto Giovanardi

Magnetochemistry 2021, 7(2), 19; https://doi.org/10.3390/magnetochemistry7020019 - 25 Jan 2021

Cited by 5 | Viewed by 4339

Abstract

This study focuses on the influence of an applied external magnetic field on the electrodeposition process and capacitive performances of MnO

_{2}

, as pseudo-capacitive active material for supercapacitors electrodes. MnO

_{2}

was electrochemically deposited on Si/Au substrates in the presence and in [...] Read more.

This study focuses on the influence of an applied external magnetic field on the electrodeposition process and capacitive performances of MnO

_{2}

, as pseudo-capacitive active material for supercapacitors electrodes. MnO

_{2}

was electrochemically deposited on Si/Au substrates in the presence and in the absence of a 0.5 T magnet, and its capacitive performance was tested via electrochemical characterization. The samples obtained in the presence of the magnetic field show a positive influence on the deposition process: the increase in deposition efficiency leads to more compact and uniform MnO

_{2}

coatings, with a decrease in capacitance values for the samples produced with the magnetic field. Full article

(This article belongs to the Special Issue Applications of Magnetization and Polarization for Molecules and Materials)

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5 pages, 1734 KiB

Open AccessArticle

Asymmetric Magnetoelectrochemistry: An Efficient Method to Grow Enantiopure Self-Assemble Monolayer

by Suryakant Mishra and Debkumar Bhowmick

Magnetochemistry 2020, 6(3), 37; https://doi.org/10.3390/magnetochemistry6030037 - 1 Sep 2020

Cited by 3 | Viewed by 2658

Abstract

In this work, we are presenting magnetic field dependent electrochemical method to grow enantiopure monolayer. Thiol gold monolayer formation by redox reaction is studied on gold coated ferromagnetic surface. Infrared and photoemission spectroscopies are used to probe the quality of the monolayers, grown [...] Read more.

In this work, we are presenting magnetic field dependent electrochemical method to grow enantiopure monolayer. Thiol gold monolayer formation by redox reaction is studied on gold coated ferromagnetic surface. Infrared and photoemission spectroscopies are used to probe the quality of the monolayers, grown using different direction of magnetization of surface. Commercially available chiral molecules, L-cysteine along with dsDNA are used as control molecules for the measurements. Since it is established by aligning the electron spin within the surface, it helps to adsorb specific enantiomer of molecules, we have shown how direction of the magnet helps to grow good quality monolayer. Potential application of this work is in improving quality of monolayer and chiral separation. Full article

(This article belongs to the Special Issue Applications of Magnetization and Polarization for Molecules and Materials)

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7 pages, 697 KiB

Open AccessArticle

Magnetoelectrochemistry and Asymmetric Electrochemical Reactions

by Suryakant Mishra, Marzia di Marzio, Roberto Giovanardi and Francesco Tassinari

Magnetochemistry 2020, 6(1), 1; https://doi.org/10.3390/magnetochemistry6010001 - 18 Dec 2019

Cited by 9 | Viewed by 3899

Abstract

Magnetoelectrochemistry is a branch of electrochemistry where magnetic fields play a vital role in the oxidation and reduction process of the molecules. When it comes to spin-dependent electrochemistry (SDE), becomes a new paradigm. This work presents electrochemical response during the “chiral imprinting” on [...] Read more.

Magnetoelectrochemistry is a branch of electrochemistry where magnetic fields play a vital role in the oxidation and reduction process of the molecules. When it comes to spin-dependent electrochemistry (SDE), becomes a new paradigm. This work presents electrochemical response during the “chiral imprinting” on working electrodes and the effects of potentiostatic and galvanostatic methods. We explore the use of the SDE concept, which is implemented for chiral-ferromagnetic (CFM) hybrid working electrodes, and we compare various electrochemical parameters affecting the quality of deposition. We electrochemically co-deposited nickel (Ni) with a chiral compound (tartaric acid) in its enantiopure forms (L and D), which allows us to obtain a chiral co-deposited nickel-tartaric acid (Ni-LTA or Ni-DTA) working electrode. Full article

(This article belongs to the Special Issue Applications of Magnetization and Polarization for Molecules and Materials)

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8 pages, 1799 KiB

Open AccessArticle

Surface Chirality in Rotational Magnetoelectrodeposition of Copper Films

by Iwao Mogi, Ryoichi Morimoto, Ryoichi Aogaki and Kohki Takahashi

Magnetochemistry 2019, 5(3), 53; https://doi.org/10.3390/magnetochemistry5030053 - 12 Sep 2019

Cited by 10 | Viewed by 2596

Abstract

Chiral surface formation was investigated in rotational magnetoelectrodeposition (RMED) of copper films, where an electrochemical cell was rotated in magnetic fields. The RMED was conducted with clockwise or anticlockwise rotation in the magnetic fields parallel or antiparallel to the ionic currents. The rotational [...] Read more.

Chiral surface formation was investigated in rotational magnetoelectrodeposition (RMED) of copper films, where an electrochemical cell was rotated in magnetic fields. The RMED was conducted with clockwise or anticlockwise rotation in the magnetic fields parallel or antiparallel to the ionic currents. The rotational frequencies were 0.5–6 Hz, and the magnetic fields were 2–5 T. The chiral behaviors are divided into four types: type I has chirality depending on the magnetic field polarity, type II has chirality depending on the rotational direction, and type III has chirality depending on both directions. Type IV represents chiral symmetry breaking, where the RMED films exhibit only L activity in any magnetic field polarity and rotational direction. Full article

(This article belongs to the Special Issue Applications of Magnetization and Polarization for Molecules and Materials)

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Review

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17 pages, 2833 KiB

Open AccessReview

Resonant Soft X-ray Reflectivity in the Study of Magnetic Properties of Low-Dimensional Systems

by Adriano Verna, Raffaella Capelli and Luca Pasquali

Magnetochemistry 2021, 7(10), 136; https://doi.org/10.3390/magnetochemistry7100136 - 7 Oct 2021

Cited by 6 | Viewed by 2808

Abstract

In this review, the technique of resonant soft X-ray reflectivity in the study of magnetic low-dimensional systems is discussed. This technique is particularly appealing in the study of magnetization at buried interfaces and to discriminate single elemental contributions to magnetism, even when this [...] Read more.

In this review, the technique of resonant soft X-ray reflectivity in the study of magnetic low-dimensional systems is discussed. This technique is particularly appealing in the study of magnetization at buried interfaces and to discriminate single elemental contributions to magnetism, even when this is ascribed to few atoms. The major fields of application are described, including magnetic proximity effects, thin films of transition metals and related oxides, and exchange-bias systems. The fundamental theoretical background leading to dichroism effects in reflectivity is also briefly outlined. Full article

(This article belongs to the Special Issue Applications of Magnetization and Polarization for Molecules and Materials)

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22 pages, 3785 KiB

Open AccessReview

Nano-Structured Dilute Magnetic Semiconductors for Efficient Spintronics at Room Temperature

by Akanksha Gupta, Rui Zhang, Pramod Kumar, Vinod Kumar and Anup Kumar

Magnetochemistry 2020, 6(1), 15; https://doi.org/10.3390/magnetochemistry6010015 - 16 Mar 2020

Cited by 72 | Viewed by 7955

Abstract

In recent years, many efforts have been made to develop advanced metal oxide semiconductor nanomaterials with exotic magnetic properties for modern applications w.r.t traditional analogues. Dilute magnetic semiconductor oxides (DMSOs) are promising candidates for superior control over the charge and spin degrees of [...] Read more.

In recent years, many efforts have been made to develop advanced metal oxide semiconductor nanomaterials with exotic magnetic properties for modern applications w.r.t traditional analogues. Dilute magnetic semiconductor oxides (DMSOs) are promising candidates for superior control over the charge and spin degrees of freedom. DMSOs are transparent, wide band gap materials with induced ferromagnetism in doping, with a minor percentage of magnetic 3d cation to create a long-range antiferromagnetic order. Although significant efforts have been carried out to achieve DMSO with ferromagnetic properties above room temperature, it is a great challenge that still exists. However, TiO₂, SnO₂, ZnO and In₂O₃ with wide band gaps of 3.2, 3.6, 3.2 and 2.92 eV, respectively, can host a broad range of dopants to generate various compositions. Interestingly, a reduction in the size of these binary oxides can induce ferromagnetism, even at room temperature, due to the grain boundary, presence of defects and oxygen vacancies. The present review provides a panorama of the structural analysis and magnetic properties of DMSOs based on binary metal oxides nanomaterials with various ferromagnetic or paramagnetic dopants, e.g., Co, V, Fe and Ni, which exhibit enhanced ferromagnetic behaviors at room temperature. Full article

(This article belongs to the Special Issue Applications of Magnetization and Polarization for Molecules and Materials)

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Other

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12 pages, 1233 KiB

Open AccessPerspective

False Chirality, Absolute Enantioselection and CP Violation: Pierre Curie’s Legacy

by Laurence D. Barron

Magnetochemistry 2020, 6(1), 5; https://doi.org/10.3390/magnetochemistry6010005 - 15 Jan 2020

Cited by 19 | Viewed by 4820

Abstract

The 1884 suggestion of Pierre Curie (1859–1906) that the type of dissymmetry shown by collinear electric and magnetic fields may induce an enantiomeric excess, in a chemical reaction that would otherwise produce a racemic mixture, is explored in the context of fundamental symmetry [...] Read more.

The 1884 suggestion of Pierre Curie (1859–1906) that the type of dissymmetry shown by collinear electric and magnetic fields may induce an enantiomeric excess, in a chemical reaction that would otherwise produce a racemic mixture, is explored in the context of fundamental symmetry arguments. Curie’s arrangement exhibits false chirality (time-noninvariant enantiomorphism), and so it may not induce absolute enantioselection (ae) in a process that has reached thermodynamic equilibrium, since it does not lift the degeneracy of chiral enantiomers. However, it may do so in far-from-equilibrium processes via a breakdown in microscopic reversibility analogous to that observed in elementary particle processes under the influence of CP violation, the associated force possessing false chirality with respect to CP enantiomorphism. In contrast, an influence like circularly polarized light exhibiting true chirality (time-invariant enantiomorphism) lifts the degeneracy of enantiomers, and so may induce ae in all circumstances. Although to date, ae has not been observed under the influence of Curie’s arrangement of collinear electric and magnetic fields, it is argued that two different experiments have now demonstrated ae under a falsely chiral influence in systems far from equilibrium, namely in a spinning sample under a gravitational field, and in the separation of enantiomers at a ferromagnetic surface. Full article

(This article belongs to the Special Issue Applications of Magnetization and Polarization for Molecules and Materials)

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