Faster synthesis of A-type carbonated hydroxyapatite powders prepared by high-temperature reaction

Acknowledgements The authors would like to acknowledge the University of Aberdeen and the Royal Commission for the Exhibition of 1851 for providing financial support as well as Mr Colin Taylor and Mr John Still for their assistance in collecting some of the experimental data presented here.Peer reviewedPostprin

1-[2-(Carboxymethoxy)phenyl]-N-(4-chlorophenyl)methanimine oxide

Peer reviewedPublisher PD

Potassium–carbonate co-substituted hydroxyapatite compositions : maximising the level of carbonate uptake for potential CO2 utilisation options

The authors would like to acknowledge the University of Aberdeen and the Royal Commission for the Exhibition of 1851 for providing financial support.CO2 utilisation is a rapidly growing area of interest aimed at reducing the magnitude of anthropogenic greenhouse gas emissions. We report the synthesis of potassium–carbonate (K–CO3) co-substituted hydroxyapatites with potassium and carbonate contents ranging from approximately 0.4–0.9 wt% and 3.4–13.0 wt% respectively via an aqueous precipitation reaction between calcium hydroxide, phosphoric acid and either potassium carbonate or potassium hydrogen–carbonate. The incorporated carbonate is situated on both hydroxyl and phosphate sites. A subsequent heat treatment in dry CO2 at 600 °C allowed for a K–CO3 co-substituted apatite containing approximately 16.9 wt% CO32− to be prepared, amongst the largest carbonate contents that have been reported for such a material to date. Although this work shows that K–CO3 co-substituted apatites with high levels of carbonate incorporation can be prepared using simple, room temperature, aqueous precipitation reactions with starting reagents unlikely to pose significant environmental risks, testing of these materials in prospective applications (such as solid fertilisers) is required before they can be considered a viable CO2 utilisation option. A preliminary assessment of the effect of potassium/carbonate substitution on the solubility of the as-prepared compositions showed that increasing carbonate substitution increased the solubility.Publisher PDFPeer reviewe

Bis[1-(isopropyl­ideneamino)guanidinium] bis­(3-nitro­benzoate) monohydrate

The asymmetric unit of the title salt hydrate, 2C4H11N4 +·2C7H4NO4 −·H2O, comprises two independent 1-(isopropyl­ideneamino)guanidinium cations, two independent 3-nitro­benzoate anions and a water mol­ecule of crystallization. There are minimal geometric differences between the two planar [maximum deviations 0.061 (2) and 0.088 (2) Å] cations, and between the two almost planar anions [C–C–C–O and C–C–N–O torsion angles of 0.3 (3) and 11.1 (4) °, respectively in the first anion and −173.7 (2) and −0.1 (4), respectively in the second anion]. Extensive O—H⋯O and N—H⋯O hydrogen bonding between all components of the structure leads to the formation of a two-dimensional array with an undulating topology in the bc plane

Nano-scale hydroxyapatite compositions for the utilization of CO2 recovered using post-combustion carbon capture

Acknowledgments The authors would like to acknowledge the University of Aberdeen for providing financial support, the advice of Dr Jo Duncan with regards to the identification of phases from XRD and Mr Colin Taylor at the UoA School of Geosciences for support in obtaining the carbonate analysis.Peer reviewedPostprin

The Relationship between the Crystal Structure and Electrical Properties of Oxide Ion Conducting Ba3W1.2Nb0.8O8.6

This research was supported by the University of Aberdeen and EPSRC (research grant EP/L002493/1). We also acknowledge the UK Science and Technology Facilities Council (STFC) for provision of beamtime at ISIS and the ILL.Peer reviewedPostprintPostprin

Methyl 1-{4-[(S)-2-(meth­oxy­carbon­yl)pyrrolidin-1-yl]-3,6-dioxocyclo­hexa-1,4-dien-1-yl}pyrrolidine-2-carboxyl­ate

The complete mol­ecule of the title diproline ester quinone, C18H22N2O6, is generated by a crystallographic twofold axis, which passes through the centre of the benzene ring. Both –CO2Me groups are orientated to the same side of the benzene ring, with the carbonyl groups pointing roughly towards each other. The conformation of the proline residue is an envelope. In the crystal, a three-dimensional network is sustained by C—H⋯O inter­actions involving both the quinone and carbonyl O atoms

Oxide Ion Conductivity in the Hexagonal Perovskite Derivative Ba3MoNbO8.5

This research was supported by the Northern Research Partnership and the University of Aberdeen. We also acknowledge STFC-GB for provision of beamtime at ISIS.Peer reviewedPostprin

The Crystal Structure of Ba3Nb2O8 Revisited : A Neutron Diffraction and Solid-State NMR Study

JMSS, ACM and EJW acknowledge support from the University of Aberdeen for funding and RCUK/ISIS for neutron time. JVH acknowledges the continued funding of the Solid State NMR Facility and other instrumentation at Warwick used in this research which was facilitated by EPSRC, the University of Warwick and partial funding through Birmingham Science City Advanced Materials Projects 1 and 2, which in turn was supported by Advantage West Midlands (AWM) and the European Regional Development Fund (ERDF).Peer reviewedPostprin