JACS paper!

Under leadership of Akihiro Uehara a combined electrochemical/X-ray absorption spectroscopy study deconstructing the famous Brust-Schiffrin synthesis of gold nanoparticles has been carried out. The results elucidates some of the transformations taking place during this two-phase synthesis. The results show that the reaction at the oil-water interface includes a time dependent evolution of the Au(I) species formed as intermediates, and identifies the nature of the (also time dependent) thiolate side products.

Electrochemical Insight into the Brust-Schiffrin Synthesis of Au Nanoparticles
A. Uehara, S. G. Booth, S.-Y. Chang, S. L. M. Schroeder, T. Imai, T. Hashimoto, J. F. W. Mosselmans & R. A. W. Dryfe
Journal of the American Chemical Society 137 (2015) 15135–15144.
DOI: 10.1021/jacs.5b07825

Sustainable Heavy Metal Removal from Mining Effluents

We have just published a study of sustainable heavy metal removal from copper mining effluents in Chile by use of bark chips, a sustainable by-product of the local forestry industry.

Sustainable Natural Adsorbents for Heavy Metal Removal from Wastewater: Lead Sorption on Pine Bark (Pinus Radiata D.Don)
G. Montes-Atenas & S. L. M. Schroeder
Surface & Interface Analysis 47 (2015) 996-1000.
DOI: 10.1002/sia.5807

Sweet X-ray spectroscopy

We recently realised that Near-edge X-ray absorption fine-structure (NEXAFS) spectroscopy at the C K-edge can distinguish between different saccharides because minute variations in average C-O bond lengths manifest as detectable shifts of the shape resonances associated with these bonds. This opens up the possibility for novel analytical approaches, for example to identify different types of sugars in drug formulations or foods:

NEXAFS Sensitivity to Bond Lengths in Complex Molecular Materials: A Study of Crystalline Saccharides
A. Gainar, J. S. Stevens, C. Jaye, D. A. Fischer & S. L. M. Schroeder
Journal of Physical Chemistry B 119 (2015), in press.

2015 Publications So Far…

The group has had a good run of publications this year. So far our 2015 output of papers includes:

Intermolecular Bonding of Hemin in Solution and in Solid State Probed by N K-edge X-ray Spectroscopies
R. Golnak, J. Xiao, K. Atak, J. S. Stevens, A. Gainar, S. L. M. Schroeder & E. F. Aziz
Physical Chemistry – Chemical Physics 17 (2015), accepted.
DOI: 10.1039/C5CP04529K
Fenton-Like Oxidation of 4−Chlorophenol: Homogeneous or Heterogeneous?
C.-C. Kuan, S.-Y. Chang, S. L. M. Schroeder
Industrial & Engineering Chemistry Research 54 (2015) 8122–8129.
DOI: 10.1021/acs.iecr.5b02378
Gold Deposition at a Free-Standing Liquid/Liquid Interface, Evidence for the Formation of Au(I) by Microfocus X-ray Spectroscopy (μXRF and μXAFS) and Cyclic Voltammetry
S. G. Booth, A. Uehara, S.-Y. Chang, J. F. W. Mosselmans, S. L. M. Schroeder, R. A. W. Dryfe
Journal of Physical Chemistry C 119 (2015) 16785–16792.
DOI: 10.1021/acs.jpcc.5b05127
Synthesis of Polyurea-Polyether Core Shell Nanoparticles via Spontaneous Nanoprecipitation
P. Locatelli, S. Woutters, C. Lindsay, S. L. M. Schroeder, J. H. Hobdell & A. Saiani
RSC Advances 5 (2015) 41668-41676.
DOI: 10.1039/c5ra03662c
Structure and Bonding in Au(I) Chloride Species: A Critical Examination of X-ray Absorption Spectroscopy (XAS) Data
S.-Y. Chang, A. Uehara, S. G. Booth, K. Ignatyev, J. F. W. Mosselmans, R. A. W. Dryfe, S. L. M. Schroeder
RSC Advances 5 (2015) 6912-6918.
DOI: 10.1039/C4RA13087A
Proton Transfer, Hydrogen Bonding, and Disorder: Nitrogen NEXAFS and XPS of Bipyridine-Acid Salts and Co-crystals
J. S. Stevens, L. K. Newton, C. Jaye, C. A. Muryn, D. A. Fischer & S. L. M. Schroeder
Crystal Growth & Design 15 (2015) 1776-1783.
DOI: 10.1021/cg5018278
Self-Association of Organic Solutes in Solution: A NEXAFS Study of Aqueous Imidazole
M. J. Thomason, C. R. Seabourne, B. M. Sattelle, G. A. Hembury, J. S. Stevens, A. J. Scott, E. F. Aziz & S. L. M. Schroeder
Faraday Discussions 179 (2015) 269-289..
DOI: 10.1039/C5FD00005J
Chemical Speciation and Bond Lengths of Organic Solutes by Core Level
Spectroscopy: pH- and Solvent-Influence on p-Aminobenzoic Acid

J. S. Stevens, A. Gainar, E. Suljoti, J. Xiao, R. Golnak, E. F. Aziz & S. L. M. Schroeder
Chemistry – A European Journal 21 (2015) 7256-7263.
DOI: 10.1002/chem.201405635

Paper comparing peptide surface functionalisation methods for poly-caprolactone

We have published an XPS study comparing two methods for poly-caprolactone surface functionalisation with cell-binding RGD peptides.

Immobilisation of Cell-Binding Peptides on Poly-ε-Caprolactone (PCL) Films: A Comparative XPS Study of Two Chemical Surface Functionalisation Methods
J.S. Stevens, A.C. de Luca, S. Downes, G. Terenghi, S.L.M. Schroeder
Surface and Interface Analysis (2014) early view.


Two papers from our group have been accepted recently:

Conservation of Artists’ Acrylic Emulsion Paints: XPS, NEXAFS and ATR FTIR Studies of Wet Cleaning Methods
E.A. Willneff, B.A. Ormsby, J.S. Stevens, C. Jaye, D.A. Fischer, S.L.M. Schroeder
Surface and Interface Analysis (2014), early view.

Proton Transfer and Hydrogen Bonding in the Organic Solid State: A Combined XRD/XPS/ssNMR Study of 17 Organic Acid-Base Complexes
J.S. Stevens, S.J. Byard, C.S. Seaton, G. Sadiq, R.J. Davey, S.L.M. Schroeder
Physical Chemistry Chemical Physics 16 (2014) 1150-1160.

Paper on Novel Spectroelectrochemical Technique

A windowless electrochemical cell for the spectroscopic investigation of the liquid-liquid interface, using a dual droplet configuration, has been designed. The setup permits in situ probing of the bulk solutions and the interfacial region by fibre-optic UV-vis spectroscopy, microfocus X-ray fluorescence (XRF) elemental mapping, and microfocus X-ray absorption near-edge structure (micro-XANES) spectroscopy. The electrodeposition of Au, induced by ion transfer of the tetrachloroaurate complex from a halogenated solvent (containing a weak reducing agent) to the aqueous phase, has been monitored by a combination of the three techniques. The reaction can be followed in-situ by UV-vis spectroscopy by detecting the oxidised form of the reducing agent. Voltammetric evidence suggests the formation of interfacial Au(I) species, whereas micro-XANES detect the presence of metallic Au(0).

In Situ Spectroelectrochemistry at Free-Standing Liquid-Liquid Interfaces: UV-vis Spectroscopy, Microfocus X-ray Absorption Spectroscopy and Fluorescence Imaging
Y. Gründer, J.F.W. Mosselmans, S.L.M. Schroeder & R.A.W. Dryfe
Journal of Physical Chemistry C 117 (2013), 5765–5773.

Paper on XPS of Amino Acids and Peptides

Having made some unexpected impact with our 2009 Surface and Interface Analysis paper on the XPS of saccharides (see here), we are now publishing a conceptually similar paper, this time dealing with the XPS of several amino acids and peptides derived from them:

Quantitative Analysis of Complex Amino Acids and RGD Peptides by X-ray Photoelectron Spectroscopy (XPS)
J.S. Stevens, A.C. de Luca, M. Pelendritis, G. Terenghi, S. Downes, S.L.M. Schroeder
Surface and Interface Analysis (2013), in press.
DOI: to be confirmed

Review in Angewandte Chemie: Nucleation of Organic Crystals

Roger and Sven, together with Joop ter Horst (University of Delft), have published a review in Angewandte Chemie:

Nucleation of Organic Crystals – A Molecular Perspective
R.J. Davey, S.L.M. Schroeder & J.H. ter Horst
Angewandte Chemie – International Edition 52 (2013) 2166–2179.

German version:

Keimbildung organischer Kristalle aus molekularer Sichtweise
R.J. Davey, S.L.M. Schroeder & J.H. ter Horst
Angewandte Chemie 125 (2013) 2220–2234.

Paper on Uranium/Plutonium Dioxide Dissolution in Nitric Acid

A joint paper with NNL on uranium/plutonium dioxide dissolution in nitric acid has been published.

The Chemistry of (U,Pu)O2 Dissolution in Nitric Acid
M.J. Carrott, P.M.A. Cook, O.D. Fox, C.J. Maher & S.L.M. Schroeder
Procedia Chemistry 7 (2012) 92-97.