Influences of high magnetic field on glycine crystal growth

Sueda, Manabu; Katsuki, Akio; Fujiwara, Yoshihisa; Tanimoto, Yoshifumi

doi:10.1016/j.stam.2006.02.006

Cited by 11 publications

(11 citation statements)

References 15 publications

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“…[168,170] The observations of an amorphous phase of glycine on freezing aqueous solutions that then transforms into the β-polymorphs (either directly, or via glycine dihydrate) [45] is in agreement with such a model. Nonphotochemical laser-induced nucleation (NPLIN), [162,[175][176][177][178][179][180][181] and crystallization in electromagnetic fields [182][183][184] have been taken as demonstration of the validity of such a model for the crystallization occurring in supersaturated (and aged) aqueous glycine solutions. The techniques based on changing the rate of increasing supersaturation (antisolvent crystallization, [185][186][187] spray-drying, [188][189][190][191][192] freeze-drying, [193][194][195][196][197] cooling at variable rates [45,198,199] ) suppose using the Ostwald's rule of stages, [200,201] when a metastable form nucleates first and in this way also the batch product can be prepared as a metastable polymorph.…”

Section: Crystallization Procedures and Mechanismsmentioning

confidence: 99%

Glycine: The Gift that Keeps on Giving

Boldyreva

2021

Israel Journal of Chemistry

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Glycine is a small molecule. It cannot change its conformation and is achiral. Despite the apparent simplicity, glycine shows endless diversity in its behavior over many phenomena. It was the first amino acid for which polymorphism was reported, first on crystallization and then on hydrostatic compression. The polymorphs differ in their physical properties and their biological activity. Glycine clusters persist in solution, leading to "solution memory". Phenomena at interfaces are critically important for crystal growth, dissolution, and for physical properties, which can be at times unexpected, like polarity in centrosymmetric αpolymorph. It is a great pleasure to remind of these remarkable phenomena in a special issue honoring professors Meir Lahav and Leslie Leiserowitz, who pioneered the study of the behavior of this unique molecule in many respects, and showed how complex and non-trivial phenomena can be at interfaces: between phases and between research fields.

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Section: Crystallization Procedures and Mechanismsmentioning

confidence: 99%

Glycine: The Gift that Keeps on Giving

Boldyreva

2021

Israel Journal of Chemistry

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“…The maximum strength of the EMF was 15.0 T in the vertical direction at the centre position. A detailed description of the superconducting magnet system has been reported elsewhere with the magnetic field spatial distribution along the centre axis shown in figure 2b [50]. The solutions were maintained in the strong royalsocietypublishing.org/journal/rsos R. Soc.…”

Section: Fabrication Techniquementioning

confidence: 99%

Enhanced magnetic performance of aligned wires assembled from nanoparticles: from nanoscale to macroscale

Kartikowati

Iwaki

et al. 2020

R. Soc. open sci.

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Magnetic wires in highly dense arrays, possessing unique magnetic properties, are eagerly anticipated for inexpensive and scalable fabrication technologies. This study reports a facile method to fabricate arrays of magnetic wires directly assembled from well-dispersed α ″ -Fe 16 N 2 /Al 2 O 3 and Fe 3 O 4 nanoparticles with average diameters of 45 nm and 65 nm, respectively. The magnetic arrays with a height scale of the order of 10 mm were formed on substrate surfaces, which were perpendicular to an applied magnetic field of 15 T. The applied magnetic field aligned the easy axis of the magnetic nanoparticles (MNPs) and resulted in a significant enhancement of the magnetic performance. Hysteresis curves reveal that values of magnetic coercivity and remanent magnetization in the preferred magnetization direction are both higher than that of the nanoparticles, while these values in the perpendicular direction are both lower. Enhancement in the magnetic property for arrays made from spindle-shape α ″ -Fe 16 N 2 /Al 2 O 3 nanoparticles is higher than that made from cube-like α ″ -Fe 16 N 2 /Al 2 O 3 ones, owing to the shape anisotropy of MNPs. Furthermore, the assembled highly magnetic α ″ -Fe 16 N 2 /Al 2 O 3 arrays produced a detectable magnetic field with an intensity of approximately 0.2 T. Although high-intensity external field benefits for the fabrication of magnetic arrays, the newly developed technique provides an environmentally friendly and feasible approach to fabricate magnetic wires in highly dense arrays in open environment condition.

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“…In a gravitational field, usually the process progresses in interface control. According to the growth of glycine crystals, a concentration gradient exists around a crystal, and its thickness of diffusion layer is reported to be 0.04 mm [8]. Since, the concentration at the interface is very low, we put the concentration at nothing for simplification.…”

Section: Resultsmentioning

confidence: 99%