The Role of Oxygen in the Priming of Neutrophils on Exposure to a Weak Magnetic Field

Sliding friction levels of thin (1–2 monolayers) and thick (~10 monolayers) oxygen films adsorbed on nickel and gold at 47.5 K have been measured by means of a quartz crystal microbalance (QCM) technique. Friction levels for the thin (thick) films on nickel in the presence of a weak magnetic field were observed to be approximately 30% (50%) lower than those recorded in the absence of the external field. Friction levels for thin films on gold were meanwhile observed to be substantially increased in the presence of the field. Magnetically-induced structural reorientation (magnetostriction) and/or realignment of adlayer spins, which respectively reduce structural and magnetic interfacial corrugation and commensurability, appear likely mechanisms underlying the observed field-induced reductions in friction for the nickel samples. Eddy current formation in the gold substrates may account for the increased friction levels in this system. The work demonstrates the role of magnetic effects in model systems that are highly amenable to theoretical studies and modeling.

Download Full-text

Role of weak magnetic field for enhanced oxidation of orange G by magnetic Fenton

Environmental Science and Pollution Research ◽

10.1007/s11356-021-14887-2 ◽

2021 ◽

Author(s):

Zhenyu Shi ◽

Ruijia Zhang ◽

Jing Zhang

Keyword(s):

Magnetic Field ◽

Weak Magnetic Field ◽

Orange G ◽

Enhanced Oxidation

Download Full-text

Directional role of weak magnetic field on the self-fabrication of ordered nickel chains

Journal of Crystal Growth ◽

10.1016/j.jcrysgro.2007.09.015 ◽

2007 ◽

Vol 309 (1) ◽

pp. 60-64 ◽

Cited By ~ 5

Author(s):

Xueliang Li ◽

Changlong Han

Keyword(s):

Magnetic Field ◽

Weak Magnetic Field ◽

The Self

Download Full-text

Enhanced Cr(VI) removal by zero-valent iron coupled with weak magnetic field: Role of magnetic gradient force

Separation and Purification Technology ◽

10.1016/j.seppur.2016.11.075 ◽

2017 ◽

Vol 176 ◽

pp. 40-47 ◽

Cited By ~ 38

Author(s):

Jinxiang Li ◽

Hejie Qin ◽

Wei-xian Zhang ◽

Zhong Shi ◽

Dongye Zhao ◽

...

Keyword(s):

Magnetic Field ◽

Weak Magnetic Field ◽

Zero Valent Iron ◽

Gradient Force ◽

Magnetic Gradient

Download Full-text

Role of weak magnetic field for enhanced oxidation of orange G by magnetic Fenton

10.21203/rs.3.rs-160267/v1 ◽

2021 ◽

Author(s):

Zhenyu Shi ◽

Ruijia Zhang ◽

Jing Zhang

Keyword(s):

Magnetic Field ◽

Weak Magnetic Field ◽

Cost Effective ◽

Butyl Alcohol ◽

Paramagnetic Resonance ◽

Quenching Effect ◽

Tert Butyl Alcohol ◽

Initial Ph ◽

Orange G

Abstract The role of weak magnetic field (WMF) on the degradation of a common textile azo-dye, orange G (OG), by magnetic Fenton system was investigated in detail. The results showed that the presence of WMF can provide better performance of the Fe3O4/H2O2 system for OG degradation. The optimized reaction conditions were contained at 1 mM Fe3O4 as Fe, 20 mT of magnetic field intensity, 20 mM H2O2 and initial pH of 3.0. The removal efficiency of OG by Fe3O4/H2O2 coupling with WMF increased largely from 56.3–82.3% compared with Fe3O4/H2O2 process. Both the electron paramagnetic resonance (EPR) analysis and the quenching effect of tert-butyl alcohol (TBA) confirmed that hydroxyl radical (•OH) was the primary reactive oxygen species in WMF-Fe3O4/H2O2 system. The improving effect of WMF was explained by the magnetoconvection theory. The presence of WMF could accelerate the corrosion rate of Fe3O4 and thus promoted the release of Fe(II), which leaded to the increased production of •OH and enhanced the degradation of OG. Moreover, it was surprising to observe that the WMF induced improvement in OG degradation by heterogeneous Fenton involving the iron sludge, namely FeOOH and Fe2O3, as catalysts. These results indicated that WMF could be utilized as an efficient and cost effective strategy to improve the removal of organic pollutants by iron oxide-based Fenton process.

Download Full-text

The Coupling Use of Weak Magnetic Field and Fe0/H2O2 Process for Bisphenol a Abatement: Influence of Reaction Conditions and Mechanisms

Water ◽

10.3390/w13131724 ◽

2021 ◽

Vol 13 (13) ◽

pp. 1724

Author(s):

Liping Liang ◽

Fenfen Xi ◽

Liubiao Cheng ◽

Weishou Tan ◽

Qiang Tang ◽

...

Keyword(s):

Magnetic Field ◽

Bisphenol A ◽

Weak Magnetic Field ◽

Heterogeneous Fenton ◽

Reaction Conditions ◽

Bpa Removal ◽

Ph Range ◽

Background Ions

The coupling use of the heterogeneous Fenton-like process (zero-valent iron (Fe0)/H2O2) and weak magnetic field (MWF) for bisphenol A (BPA) abatement was systematically investigated in this study. Though both the Fe0/H2O2 and WMF-Fe0/H2O2 processes are sensitive to pH, WMF remarkably enhanced BPA removal under the pH range of 3.0–6.0 by 0.5–9.5 times. The characterization of Fe0 confirmed the role of WMF in promoting the corrosion of Fe0. Radicals, rather than Fe intermediates, were responsible for BPA degradation. Due to the presence of Cl– as the background ions and its reactivity towards HO•, reactive chlorine species (RCS, i.e., Cl• and Cl2•−) were produced and considerably contributed to BPA degradation. In addition, ~37% and 54% of degraded BPA was ascribed to RCS in the presence of 2 and 100 mM of Cl−, respectively. However, 1.9 mg/L of ClO3− was detected in the presence of 2 mM of Cl− in the WMF- Fe0/H2O2 process. HCO3− could diminish ClO3− generation significantly through transforming RCS. The concentration of ClO3− decreased by 74% and 82% with dosing 1 and 10 mM HCO3−, respectively. The results of this study suggest that the WMF-Fe0/H2O2 process is a promising approach for BPA removal.

Download Full-text