Searched for: author:"Parnell, S.R."
(1 - 17 of 17)
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Schmitt, Julien (author), Zeeuw, Jan Joost (author), Zeeuw, Jan Joost (author), Plomp, J. (author), Bouwman, W.G. (author), Washington, Adam L. (author), Duif, C.P. (author), Thijs, M.A. (author), Parnell, S.R. (author)
The initial formation stages of surfactant-templated silica thin films which grow at the air-water interface were studied using combined spin-echo modulated small-angle neutron scattering (SEMSANS) and small-angle neutron scattering (SANS). The films are formed from either a cationic surfactant or nonionic surfactant (C16EO8) in a dilute...
journal article 2020
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Bakker, J.H. (author), Washington, Adam L. (author), Parnell, S.R. (author), van Well, A.A. (author), Pappas, C. (author), Bouwman, W.G. (author)
SESANS data analysis has been implemented in the SasView software package, allowing SESANS experiments to be analyzed using a numerical Hankel transformation of isotropic small-angle scattering (SAS) models. The error of the numerical approximation is three orders of magnitude below typical experimental errors. All advanced data fitting...
journal article 2020
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Bernardo, Gabriel (author), Melle-Franco, Manuel (author), Washington, Adam L. (author), Dalgliesh, Robert M. (author), Li, Fankang (author), Mendes, Adélio (author), Parnell, S.R. (author)
Fullerene derivatives are used in a wide range of applications including as electron acceptors in solution-processable organic photovoltaics. We report agglomeration of fullerene derivatives in optically opaque solutions of PC<sub>61</sub>BM and PC<sub>71</sub>BM, with concentrations ranging from 30 mg mL<sup>-1</sup> up to 90 mg mL<sup>-1<...
journal article 2020
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Parnell, S.R. (author), van Well, A.A. (author), Plomp, J. (author), Dalgliesh, R. M. (author), Steinke, N. J. (author), Cooper, J. F.K. (author), Geerits, N. (author), Steffen, K. E. (author), Snow, W. M. (author)
Various theories beyond the Standard Model predict new particles with masses in the sub-eV range with very weak couplings to ordinary matter which can possess spin-dependent couplings to electrons and nucleons. We report null results of a search for possible exotic spin-dependent couplings of the neutron which could be induced by the exchange...
journal article 2020
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Shen, J. (author), Kuhn, S. J. (author), Dalgliesh, Robert M. (author), de Haan, V. O. (author), Geerits, N. (author), Irfan, A. A.M. (author), Parnell, S.R. (author), Plomp, J. (author), van Well, A.A. (author)
The development of qualitatively new measurement capabilities is often a prerequisite for critical scientific and technological advances. Here we introduce an unconventional quantum probe, an entangled neutron beam, where individual neutrons can be entangled in spin, trajectory and energy. The spatial separation of trajectories from...
journal article 2020
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Dadisman, Ryan (author), Shen, Jiazhou (author), Feng, Hao (author), Crow, Lowell (author), Jiang, Chenyang (author), Wang, Tianhao (author), Zhang, Yuxuan (author), Bilheux, Hassina (author), Parnell, S.R. (author)
Several methods of polarized neutron scattering call for a zero magnetic field (ZF) region to reduce magnetic field integral aberrations while preserving the neutron polarization. Though the design for large angle neutron scattering has been presented in various places, the design characterization and tuning has not been discussed before. In...
journal article 2019
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Li, Fankang (author), Shen, Jiazhou (author), Parnell, S.R. (author), Thaler, Alex N. (author), Matsuda, Masaaki (author), Keller, Thomas (author), Delaire, Olivier (author), Pynn, Roger (author), Fernandez-Baca, Jaime A. (author)
The energy resolution of the conventional way of measuring a small change in a phonon dispersion curve using neutron scattering is restricted by the relatively coarse intrinsic resolution ellipsoid of the neutron triple-axis spectrometer (TAS). By implementing inelastic neutron spin echo on the host TAS using the Larmor precession of the...
journal article 2019
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Li, Fankang (author), Parnell, S.R. (author), Dalgliesh, Robert (author), Washington, Adam (author), Plomp, J. (author), Pynn, Roger (author)
To investigate long length scale structures using neutron scattering, real space techniques have shown certain advantages over the conventional methods working in reciprocal space. As one of the real space measurement techniques, spin echo modulated small angle neutron scattering (SEMSANS) has attracted attention, due to its relaxed...
journal article 2019
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Geerits, N. (author), Parnell, S.R. (author), Thijs, M.A. (author), Bouwman, W.G. (author), Plomp, J. (author)
A time of flight MIEZE spectrometerstudyis presented. The instrumentuses solenoid radio frequency(RF)spin flipperswithsquare pole shoes and a magnetic yoke. These flippers can achieve higherstaticfields than conventional resonant RF spin flippers, which employ an air core.High fields are crucial for the construction of a high resolution and...
journal article 2019
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Gaspar, Hugo (author), Santos, Raquel (author), Teixeira, Paulo (author), Hilliou, Loic (author), Weir, Michael P. (author), Duif, C.P. (author), Bouwman, W.G. (author), Parnell, S.R. (author), King, Stephen M. (author)
We investigate the morphological development of polystyrene (PS)-C <sub>60</sub> nanocomposites along the length of a prototype co-rotating twin-screw extruder with sampling capabilities. The effects of C <sub>60</sub> concentration and output on the morphological evolution along the extruder are studied employing a suite of characterization...
journal article 2019
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Geerits, N. (author), Parnell, S.R. (author), Thijs, M.A. (author), van Well, A.A. (author), Franz, C. (author), Washington, A. L. (author), Raspino, D. (author), Dalgliesh, R. M. (author), Plomp, J. (author)
A time-of-flight modulation of intensity by zero effort spectrometer mode has been developed for the Larmor instrument at the ISIS pulsed neutron source. The instrument utilizes resonant spin flippers that employ electromagnets with pole shoes, allowing the flippers to operate at frequencies up to 3 MHz. Tests were conducted at modulation...
journal article 2019
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Burg, Stephanie L. (author), Washington, Adam (author), Coles, David M. (author), Bianco, Antonino (author), McLoughlin, Daragh (author), Mykhaylyk, Oleksandr O. (author), Villanova, Julie (author), Dennison, Andrew J.C. (author), Parnell, S.R. (author)
Cyphochilus beetle scales are amongst the brightest structural whites in nature, being highly opacifying whilst extremely thin. However, the formation mechanism for the voided intra-scale structure is unknown. Here we report 3D x-ray nanotomography data for the voided chitin networks of intact white scales of Cyphochilus and Lepidiota stigma....
journal article 2019
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Parnell, S.R. (author), Dalgliesh, R. M. (author), Steinke, N. J. (author), Plomp, J. (author), van Well, A.A. (author)
RF coils have been routinely used for Larmor labelling on the Offspec instrument at ISIS. These coils encode directional information via the neutron polarization using a series of parallelogram-shaped pole shoes which can be tuned to different angles with an RF gradient flipper in the centre of each magnet. We report on measurements of the...
journal article 2018
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Li, Fankang (author), Feng, Hao (author), Parnell, S.R. (author), Crow, Lowell (author), Matsuda, Masaaki (author), Ye, Feng (author), Kimura, Tsuyoshi (author), Fernandez-Baca, Jaime (author), Pynn, Roger (author), Thaler, Alexander N. (author)
journal article 2018
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Li, Fankang (author), Feng, Hao (author), Thaler, Alexander N. (author), Parnell, S.R. (author), Hamilton, William A. (author), Crow, Lowell (author), Yang, Wencao (author), Jones, Amy B. (author), Bai, Hongyu (author), Matsuda, Masaaki (author), Baxter, David V. (author), Keller, Thomas (author), Fernandez-Baca, Jaime A. (author), Pynn, Roger (author)
The neutron Larmor diffraction technique has been implemented using superconducting magnetic Wollaston prisms in both single-arm and double-arm configurations. Successful measurements of the coefficient of thermal expansion of a single-crystal copper sample demonstrates that the method works as expected. The experiment involves a new method of...
journal article 2017
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Gaspar, Hugo (author), Teixeira, Paulo (author), Santos, Raquel (author), Fernandes, Liliana (author), Hilliou, Loic (author), Weir, Michael P. (author), Parnell, Andrew J. (author), Abrams, Kerry J. (author), Hill, Christopher J. (author), Bouwman, W.G. (author), Parnell, S.R. (author), King, Stephen M. (author), Clarke, Nigel (author), Covas, Jose A. (author), Bernardo, Gabriel (author)
We investigated the effect of the feeding formulation (premixed powders of pure components versus solvent-blended mixture) of polystyrene–C60 composites on the dispersion and reagglomeration phenomena developing along the barrel of a twin-screw extruder. The dispersion of C60 in the PS matrix is studied over different length scales using a...
journal article 2017
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Parnell, S.R. (author), Washington, A.L. (author), Parnell, A.J. (author), Walsh, A (author), Dalgliesh, RM (author), Li, F (author), Hamilton, W.A. (author), Prevost, S (author), fairclough, J.P.A. (author), Pynn, R (author)
Stöber silica particles are used in a diverse range of applications. Despite their widespread industrial and scientific uses, information on the internal structure of the particles is non-trivial to obtain and is not often reported. In this work we have used spin-echo small angle neutron scattering (SESANS) in conjunction with ultra small angle...
journal article 2016
Searched for: author:"Parnell, S.R."
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