Rapid monitoring of graphene exfoliation using NMR proton relaxation

Abstract

Graphene is now being produced on an industrial scale and there is a pressing need for rapid in-line measurements of particle size for Quality Assurance and Quality Control (QA/QC). Standardised...

Deagglomeration of DNA nanomedicine carriers using controlled ultrasonication

“…Based on this information the minimum dose to achieve optimum levels of deagglomeration was identified. The dependency of the outcome of materials processing on the square root of the inertial cavitation dose have been observed previously for different types of systems, for example the yield of graphene exfoliation upon sonication [19] , [40] .…”

NMR proton relaxation for measuring the relative concentration of nanoparticles in liquids

“…This means that NMR relaxation could be used to detect changes in concentration for any type of particles (not only spherical) as long as there is a measurable change in relaxation rate with concentration (dependent on specific surface area, chemical interactions with the solvent, etc.). 10,11…”

“…Nuclear magnetic resonance (NMR) proton relaxation is a bench-top technique with the potential to fill in this measurement gap. [10][11][12][13][14] In this work, we show its use in measuring relative concentrations of nanoparticles in a dispersion, and its suitability for the measurement of small nanoparticles at high concentration.…”

On the use of Raman spectroscopy to characterize mass-produced graphene nanoplatelets

“…To prepare the mixed GNP ref /graphite samples, 1.2 mg of the as-purchased graphite was mixed with 40 mL of NMP, and the mixture bath was sonicated for 30 min. Sonication was carried out to reduce the particle size while still maintaining the thickness to be graphite-like [ 29 ]. The graphite and GNP ref dispersions were then mixed to obtain graphite mass fractions as given in Table 1 .…”