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Autor*in

  • Smales, Glen Jacob (14)
  • Pauw, Brian Richard (8)
  • Kulak, A. (2)
  • Schnepp, Z. (2)
  • Schönhals, Andreas (2)
  • Thünemann, Andreas F. (2)
  • Alentiev, D. (1)
  • Bekheet, M. F. (1)
  • Bermeshev, M. (1)
  • Blackburn, E. (1)
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Erscheinungsjahr

  • 2020 (8)
  • 2019 (5)
  • 2018 (1)

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  • Zeitschriftenartikel (9)
  • Vortrag (2)
  • Sonstiges (1)
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  • Forschungsdatensatz (1)

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  • Englisch (14)

Referierte Publikation

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  • SAXS (6)
  • Small-angle scattering (4)
  • 266nm (1)
  • 3D printing (1)
  • Abasic site (1)
  • Advanced calorimetry (1)
  • Ag (1)
  • Agarose gel electrophorese (1)
  • Au (1)
  • Broadband Dielectric Spectrscopy (1)
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Organisationseinheit der BAM

  • 6 Materialchemie (14)
  • 6.5 Synthese und Streuverfahren nanostrukturierter Materialien (14)
  • 6.6 Physik und chemische Analytik der Polymere (3)
  • 1 Analytische Chemie; Referenzmaterialien (1)
  • 1.2 Biophotonik (1)
  • 7 Bauwerkssicherheit (1)
  • 7.5 Technische Eigenschaften von Polymerwerkstoffen (1)

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THE MAUS: A GI-/ULTRA-/W/SAXS Instrument of the future (2018)
Smales, Glen Jacob
The Multi-scale Analyzer for Ultrafine Structures or the “MAUS” for short, is a SAXS instrument that combines a multitude of features that make it both unique, and one of the most adaptable instruments around.
The SPONGE (2020)
Pauw, Brian Richard ; Smales, Glen Jacob
This software tool is intended to calculate X-ray scattering patterns from 3D objects described by an STL file. The fundamentals and use example(s) are shown.
Introduction to SAXS (2020)
Smales, Glen Jacob
A simplified introductions to small-angle scattering (SAXS), to put across the main concepts and not get bogged down in equations.
Extending SAXS instrument ranges through addition of a portable, inexpensive USAXS module (2019)
Pauw, Brian Richard ; Smith, A. J. ; Snow, T. ; Shebanova, O. ; Sutter, J. P. ; Hermida-Merino, D. ; Smales, Glen Jacob ; Terrill, N. J. ; Thünemann, Andreas F. ; Bras, W.
Ultra-SAXS can enhance the capabilities of existing SAXS/WAXS beamlines and laboratory instruments. A compact Ultra-SAXS module has been developed, which extends the measurable q-range with 0:0015 < q 1/nm) < 0:2, allowing structural dimensions between 30 < D(nm) < 4000 to be probed in addition to the range covered by a high-end SAXS/WAXS instrument. By shifting the module components in and out on their respective motor stages, SAXS/WAXS measurements can be easily and rapidly interleaved with USAXS measurements.
Gold and silver dichroic nanocomposite in the quest for 3D printing the Lycurgus cup (2020)
Kool, L. ; Dekker, F. ; Bunschoten, A. ; Smales, Glen Jacob ; Pauw, Brian Richard ; Velders, A. H. ; Saggiomo, V.
The Lycurgus cup is an ancient glass artefact that shows dichroism as it looks green when a white light is reflected on it and a red colouring appears when a white light is transmitted through it. This peculiar dichroic effect is due to silver and gold nanoparticles present in the glass. In this research we show the synthesis of dichroic silver nanoparticles and their embedding in a 3D printable nanocomposite. The addition of gold nanoparticles to the silver nanoparticle composite, gave a 3D printable nanocomposite with the same dichroism effect of the Lycurgus cup.
Complete set of raw and processed datasets, as well as associated Jupyter notebooks for analysis, associated with manuscript entitled: "The MOUSE project: a practical approach for obtaining traceable, wide-range X-ray scattering information" (2020)
Pauw, Brian Richard ; Smales, Glen Jacob
This dataset is a complete set of raw, processed and analyzed data, complete with Jupiter notebooks, associated with the manuscript mentioned in the title. In the manuscript, we provide a "systems architecture"-like overview and detailed discussions of the methodological and instrumental components that, together, comprise the "MOUSE" project (Methodology Optimization for Ultrafine Structure Exploration). Through this project, we aim to provide a comprehensive methodology for obtaining the highest quality X-ray scattering information (at small and wide angles) from measurements on materials science samples.
Zinc Phosphate Nanoparticles Produced in Saliva (2020)
Saloga, Patrick E. J. ; Smales, Glen Jacob ; Clark, Adam H. ; Thünemann, Andreas F.
This paper reports the formation of zinc phosphate nanoparticles from the artificial digestion of zinc chloride. Initially, the formation of amorphous primary particles with a mean radius of 1.1 nm is observed, alongside the formation of larger, protein stabilized aggregates. These aggregates, with a radius of gyration of 37 nm, are observed after 5 minutes of exposure to artificial saliva and are shown to be colloidally stable for a minimum time of two weeks. The initially formed primary particles are thought to consist of amorphous zinc phosphate, which is then transformed into crystalline Zn3(PO4)2·4H2O over the course of two weeks. Our results demonstrate that the interaction of inorganic salts with bodily fluids can induce the formation of de novo nanoparticles, which in turn, provides insights into how zinc‐enriched foods may also facilitate the formation of nanoparticles upon contact with saliva. As such, this may be considered as an undesirable (bio)mineralization.
The effect of precursor structure on porous carbons produced by iron-catalyzed graphitization of biomass (2020)
Hunter, R. D. ; Rowlandson, J. L. ; Smales, Glen Jacob ; Pauw, Brian Richard ; Ting, V. P. ; Kulak, A. ; Schnepp, Z.
This paper reports a systematic study into the effect of different biomass-derived precursors on the structure and porosity of carbons prepared via catalytic graphitization. Glucose, starch and cellulose are combined with iron nitrate and heated under a nitrogen atmosphere to produce Fe3C nanoparticles, which catalyze the conversion of amorphous carbon to graphitic nanostructures. The choice of organic precursor provides a means of controlling the catalyst particle size, which has a direct effect on the porosity of the material. Cellulose and glucose produce mesoporous carbons, while starch produces a mixture of micro- and mesopores under the same conditions and proceeds via a much slower graphitization step, generating a mixture of graphitic nanostructures and turbostratic carbon. Porous carbons are critical to energy applications such as batteries and electrocatalytic processes. For These applications, a simple and sustainable route to those carbons is essential. Therefore, the ability to control the precise structure of a biomass-derived carbon simply through the choice of precursor will enable the production of a new generation of energy materials.
Molecular Dynamics of Janus Polynorbornenes: Glass Transitions and Nanophase Separation (2020)
Kolmangady, Mohamed ; Szynomiak, Paulina ; Smales, Glen Jacob ; Alentiev, D. ; Bermeshev, M. ; Böhning, Martin ; Schönhals, Andreas
For the first time, dielectric and calorimetric investigations of an homologous series of Janus polynorbornenes with rigid main backbones and flexible -Si(OR)3 side groups, of differing length alkyl chains (R = Propyl, Butyl, Hexyl, Octyl, Decyl) is reported. Generally, this class of polymers has some potential for applications in the field of gas separation membranes. Two dielectrically active processes are observed at low temperatures, denoted as β- and α- relaxation. The former can be assigned to localized fluctuations, whilst the latter is related to the glassy dynamics of the flexible -Si(OR)3 side groups, creating a nanophase separation in both the alkyl chain rich and backbone rich domains. This is confirmed through temperature modulated DSC measurements and X-ray scattering experiments. The glass transition temperatures of the backbone rich domains, which are beyond or near to their degradation temperatures in terms of conventional DSC, are determined for the first time using Fast Scanning Calorimetry employing both fast heating and cooling rates. This is complimented with scattering experiments that show how the size of the alkyl chain rich domains increases with chain length. Alongside these results, a significant conductivity contribution was observed for all poly(tricyclononenes) with -Si(OR)3 side groups, which is interpreted in terms of a percolation model.
Collective orientational order and phase behavior of a discotic liquid crystal under nanoscale confinement (2019)
Yildirim, Arda ; Sentker, K. ; Smales, Glen Jacob ; Pauw, Brian Richard ; Huber, P. ; Schönhals, Andreas
The phase behavior and molecular ordering of hexakishexyloxy triphenylene (HAT6) DLC under cylindrical nanoconfinement is studied utilizing differential scanning calorimetry (DSC) and dielectric spectroscopy (DS), where cylindrical nanoconfinement is established through embedding HAT6 into the nanopores of anodic aluminum oxide membranes (AAO), and a silica membrane with pore diameters ranging from 161 nm down to 12 nm. Both unmodified and modified pore walls were considered, and in the latter case the pore walls of AAO membranes were chemical treated with n octadecylphosphonic acid (ODPA) resulting in the formation of a 2.2 nm thick layer of grafted alkyl chains. Phase transition enthalpies decrease with decreasing pore size, indicating that a large proportion of the HAT6 molecules within the pores has a disordered structure, which increases with decreasing pore size for both pore walls. In the case of the ODPA modification the amount of ordered HAT6 is increased compared to the unmodified case. The pore size dependencies of the phase transition temperatures were approximated using the Gibbs Thomson equation, where the estimated surface tension is dependent on the molecular ordering of HAT6 molecules within the pores and upon their surface. DS was employed to investigate the molecular ordering of HAT6 within the nanopores. These investigations revealed that with a pore size of around 38 nm, for the samples with the unmodified pore walls, the molecular ordering changes from planar axial to homeotropic radial. However, the planar axial configuration, which is suitable for electronic applications, can be successfully preserved through ODPA modification for most of the pore sizes.
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