A note on the microdetermination of chlorine in organic compounds

Summary A method previously described for the determination of halogen in organic compounds has been modified to make it more suitable for the determination of chlorine.

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Zusammenfassung Ein seinerzeit beschriebenes Verfahren zur Bestimmung von Halogen in organischen Verbindungen wurde modifiziert. Es ist in dieser Form für die Bestimmung von Chlor besser geeignet.

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Résumé Modification d'une méthode antérieurement décrite pour le dosage des halogènes dans les composés organiques afin de la rendre plus appropriée au dosage du chlore.

     

Crossing microfluidic streamlines to lyse, label and wash cells

We present a versatile method for continuous-flow, on-chip biological processing of cells, large bio-particles, and functional beads. Using an asymmetric post array in pressure-driven microfluidic flow, we can move particles of interest across multiple, independent chemical streams, enabling sequential chemical operations. With this method, we demonstrate on-chip cell treatments such as labeling and washing, and bacterial lysis and chromosomal extraction. The washing capabilities of this method are particularly valuable because they allow many analytical or treatment procedures to be cascaded on a single device while still effectively isolating their reagents from cross-contamination.     

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A new family of Mn₆ SMMs using phosphinate ligands

A new family of hexametallic [Mn(III)?] Single-Molecule Magnets with general formula [Mn?O?(R-sao)?(X)?(MeOH)???] (R= H, Me, Et or Ph; X = O?PHPh or O?P(Ph)?) have been synthesised and characterised. The molecules are new members of the [Mn?] family of SMMs in which the carboxylate ligands have been replaced with phenyl- and diphenylphosphinate. The magnetic cores remain largely unaltered meaning that structural distortions of the Mn-N-O-Mn torsion angles in the [Mn?O] subunits can be used to tune the magnetic properties, switching pairwise exchange interactions from antiferromagnetic to ferromagnetic. The results suggest that the Mn? building block, be it ferro- or antiferromagnetically coupled, could be an important building block for the formation of novel, functional 0-3D materials.     

Ultra Rapid Approaches to Mild Macromolecular Conjugation

In light of the increasing demand for ultra rapid and mild conjugation chemistries for use in macromolecular chemistry, the present Feature Article provides a critical overview of the very latest developments in this field. The principal aim, therefore, is the provision of a quick selection guide to aid in the formulation of a design strategy for novel functional materials and to provide recommendations for future developments in the chemistries discussed.

     

A highly-enriched 244Pu reference material for nuclear safeguards and nuclear forensics measurements

Journal of Radioanalytical and Nuclear Chemistry - A highly-enriched 244Pu isotope dilution reference material has been prepared and characterized for metrologically traceable measurements of very...     

Boundary condition effects on multiscale analysis of damage localization

The choice of boundary conditions used in multiscale analysis of heterogeneous materials affects the numerical results, including the macroscopic constitutive response, the type and extent of damage taking place at the microscale and the required size of the Representative Volume Element (RVE). We compare the performance of periodic boundary conditions and minimal kinematic boundary conditions applied to the unit cell of a particulate composite material, both in the absence and presence of damage at the particle–matrix interfaces. In particular, we investigate the response of the RVE under inherently non-periodic loading conditions, and the ability of both boundary conditions to capture localization events that are not aligned with the RVE boundaries. We observe that, although there are some variations in the evolution of the microscale damage between the two methods, there is no significant difference in homogenized responses even when localization is not aligned with the cell boundaries.