Faraday Rotation Dispersion Microscopy Imaging of Diamagnetic and Chiral Liquids with Pulsed Magnetic Field

Abstract

We have constructed an experimental setup for Faraday rotation dispersion imaging and demonstrated the performance of a novel imaging principle. By using a pulsed magnetic field and a polarized light synchronized to the magnetic field, quantitative Faraday rotation images of diamagnetic organic liquids in glass capillaries were observed. Nonaromatic hydrocarbons, benzene derivatives, and naphthalene derivatives were clearly distinguished by the Faraday rotation images due to the difference in Verdet constants. From the wavelength dispersion of the Faraday rotation images in the visible region, it was found that the resonance wavelength in the UV region, which was estimated based on the Faraday B-term, could be used as characteristic parameters for the imaging of the liquids. Furthermore, simultaneous acquisition of Faraday rotation image and natural optical rotation image was demonstrated for chiral organic liquids.

Applications of magnetic and electromagnetic forces in micro-analytical systems

“…A pulsed magnetic field higher than 10 T and shorter than 1 ms can be generated by a rather simple electromagnet with a power supply. A pulsed magnet is recommended for observing magneto-optical effects such as Faraday rotation of solution samples [285][286][287] and can be used to measure the magnetic moment of a microparticle from the relaxation experiment in the air. 288,289 An extremely high magnetic field of 100 T was used for the phase transition studies.…”

Magneto-optical activity in organic thin film materials

“…A detailed analysis of the observed Faraday effect in ferrocene aggregates allowed Watari et al to identify the supramolecular situation of the molecules with respect to their organization on a solid support or at the solution air interface [14]. The same research group employed FR measurements on isotropic organic liquids [15]. In the light of these precedents we have reported on Faraday rotation (FR) in a LC thin film device.…”

Critical Detection of Agglomeration of Magnetic Nanoparticles by Magnetic Orientational Linear Dichroism

“…However, the magneto-optical effect observed in UV–vis region is thought to have the potential to innovate common spectrophotometry and to be preferentially applied to MNP suspensions. , Typical magneto-optical phenomena applied previously to chemical systems include Faraday rotation, magnetic circular dichroism (MCD), and magnetic linear dichroism (MLD). Recently, we have investigated the simple relationship between the Faraday rotation and the concentration of lanthanide ions in aqueous solutions and demonstrated the feasibility of microscopic Faraday rotation imaging of microdiamagnetic and paramagnetic samples . The use of MCD spectra for the chiral recognition of 2-alkylalcohols with J-aggregates of the protonated porphyrins on silica gels has also been reported .…”

“…Recently, we have investigated the simple relationship between the Faraday rotation and the concentration of lanthanide ions in aqueous solutions 14 and demonstrated the feasibility of microscopic Faraday rotation imaging of microdiamagnetic and paramagnetic samples. 15 The use of MCD spectra for the chiral recognition of 2alkylalcohols with J-aggregates of the protonated porphyrins on silica gels has also been reported. 16 Here, we report that the iron-oxide MNP dispersion exhibits distinct magnetic orientational linear dichroism (MOLD) in the UV wavelength region under the application of a rather weak magnetic field of less than 40 mT, which was applied to a sample solution cell from the transversal direction to the optical beam.…”