An Assessment of the Center for Neutron Research at the National Institute of Standards and Technology Fiscal Year 2021 (2022) / Chapter Skim
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4 Technical Adequacy
4 Technical Adequacy
Pages 26-35
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From page 26... ...
. This comprehensive suite of instruments enables soft matter researchers to address problems across multiple time and length scales, where the use of neutrons is necessary and critical.
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From page 27... ...
Further development of neutron reflectometry methods on supported membranes, along with the integration of MD simulations, is likely to aid in the development of small molecule drugs to inhibit this challenging class of drug targets. The nSoft industrial consortia with NCNR has demonstrated longevity and benefits not only to industry sponsors but also to the wider soft matter user community through developments in automated sample formulations and capillary-rheo SANS.
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Operation of the spectrometer will be new, and obtaining knowledge transfer from Jülich will be important for rapidly integrating the new instrument into the user program. Broadening the user program across the soft matter domain is an opportunity to drive new and innovative science but requires significant staff effort and time.
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A bespoke sample environment also allowed spectroscopy to be performed on MACS during microwave irradiation, which allowed excited states in a Cr8 single molecule magnet (SMM) to be selectively populated and studied, providing proof of principle for a much wider range of studies of SMMs.
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Finding: The hard condensed matter program is producing world-class science. World-leading spectrometer MACS-II offers unique experimental capability (e.g., event mode measurements accessing unique time scales)
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Adsorption in a flexible MOF was found to exhibit a rare increase of adsorption capacity with temperature attributed to sorbate sorbent interactions affecting the MOF structure, and an application in the separation of propylene from propane was demonstrated.10 Neutron powder diffraction measurements conducted at the BT-1 neutron powder diffractometer at NCNR provided evidence for weak binding of CO2 as the basis of C2H2/CO2 selectivity in an iron/nickel metal-organic framework with multiple binding sites.11 In the later study, diffraction data were collected in CO2- and C2D2-loaded MOF samples. The use of deuterated acetylene allowed to avoid the large incoherent neutron scattering background caused by the hydrogen in C2H2.
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D'Elia, A.T. DeWald, et al., 2019, Elastic residual strain and stress measurements and corresponding part deflections of 3D additive manufacturing builds of IN625 AM-bench artifacts using neutron diffraction, synchrotron X-ray diffraction, and contour method, Integrating Materials and Manufacturing Innovation, 8:318–334, https://doi.org/10.1007/s40192-019-00149-0.
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thermal detectors and uses a unique NIST PML capability by measuring the absolute activity of an alpha source to ultimately determine neutron fluence with world-best precision. The neutrino physics project Precision Reactor Oscillation and Spectrum Experiment (PROSPECT)
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The neutron imaging group of the NIST Physical Measurements Laboratory operating on BT-2 and NG-6 is very strong and highly impactful. It also operates a user program, allocating 25 percent of beamtime on the BT-2 instrument through a refereed proposal system, with additional access available through a collaborative access mechanism.
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From page 35... ...
Industrially relevant measurements and characterization in chemical physics and engineering physics include dynamics of polymers, gels, and complex fluids, minerals and rocks, materials for energy technologies such as metal organic frameworks, catalysts and in situ measurements, and residual stress in industrial materials. The development of an instrument is in progress that will simultaneously combine X-ray and neutron tomography and will enable nondestructive testing of infrastructure such as concrete.
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