Local Magnetic Field Induced by Circular Motion of Ions and Molecules in a Nanotorus under Gigahertz Rotating Electric Fields

سال انتشار: 1397
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 252

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شناسه ملی سند علمی:

ISPTC21_105

تاریخ نمایه سازی: 30 دی 1397

چکیده مقاله:

Recently, we reported molecular dynamics simulations of stable cyclotron motions of ionsand water molecules in a carbon nanotorus, induced by rotating electric fields (EFs) of differentstrengths (E) and frequencies. The present study is devoted to the calculation andcharacterization of the magnetic field (MF) induced by these cyclotron motions. Results showthat the carbon nanotorus containing ions or water molecules acts as an EF-to-MF transducer.The Bx and By components of the instantaneous induced MF show large-scale oscillationssuperimposed by strong fluctuations arising respectively from overall circular motion andrandom collisions of the moving species. Analysis of the space-dependence of the induced MFcomponents shows that the induced MF is maximum at the center of the nanotorus for both ionicand molecular systems. The MF induced by cyclotron motion of the ions follows the ordersB(Ca2+) > B(Na+) ≈ B(K+) at E = 1.0 V/nm and B(E=1.0V/nm) > B(E=0.5V/nm) > B(E=0.1V/nm). The calculated time-averaged MF arising from the cyclotron motion of the chainof 81 water molecules is almost 102 times stronger than that of the ions. The induced MFstrength is decreased with increasing the distance from the nanotorus and decays effectively (lessthan 1% its maximum value) at about 17.3-18.1 and 15.9-18.2 nm along the z-axis of thenanotorus for the ions and water molecules respectively. Furthermore, magnitude of the MFinduced by cyclotron motions of water molecules and ions respectively decreases and increaseswhen the carbon atoms of the nanotorus are freed to move.

نویسندگان

Maryam Kowsar

Department of Chemistry, Shahid Beheshti University, Tehran ۱۹۸۳۹-۶۳۱۱۳, I. R. Iran

Hassan Sabzyan

Department of Chemistry, University of Isfahan, Isfahan, ۸۱۷۴۶-۷۳۴۴۱, I. R. Iran