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  1. Article ; Online: Simultaneous Surface-Enhanced Raman Scattering with a Kerr Gate for Fluorescence Suppression.

    Cabello, Gema / Sazanovich, Igor V / Siachos, Ioannis / Bilton, Matthew / Mehdi, Beata L / Neale, Alex R / Hardwick, Laurence J

    The journal of physical chemistry letters

    2024  Volume 15, Issue 2, Page(s) 608–615

    Abstract: The combination of surface-enhanced and Kerr-gated Raman spectroscopy for the enhancement of the Raman signal and suppression of fluorescence is reported. Surface-enhanced Raman scattering (SERS)-active gold substrates were demonstrated for the expansion ...

    Abstract The combination of surface-enhanced and Kerr-gated Raman spectroscopy for the enhancement of the Raman signal and suppression of fluorescence is reported. Surface-enhanced Raman scattering (SERS)-active gold substrates were demonstrated for the expansion of the surface generality of optical Kerr-gated Raman spectroscopy, broadening its applicability to the study of analytes that show a weak Raman signal in highly fluorescent media under (pre)resonant conditions. This approach is highlighted by the well-defined spectra of rhodamine 6G, Nile red, and Nile blue. The Raman spectra of fluorescent dyes were obtained only when SERS-active substrates were used in combination with the Kerr gate. To achieve enhancement of the weaker Raman scattering, Au films with different roughnesses or Au-core-shell-isolated nanoparticles (SHINs) were used. The use of SHINs enabled measurement of fluorescent dyes on non-SERS-active, optically flat Au, Cu, and Al substrates.
    Language English
    Publishing date 2024-01-10
    Publishing country United States
    Document type Journal Article
    ISSN 1948-7185
    ISSN (online) 1948-7185
    DOI 10.1021/acs.jpclett.3c02926
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Book ; Online: In silico Ptychography of Lithium-ion Cathode Materials from Subsampled 4-D STEM Data

    Robinson, Alex W. / Moshtaghpour, Amirafshar / Wells, Jack / Nicholls, Daniel / Broad, Zoe / Kirkland, Angus I. / Mehdi, Beata L. / Browning, Nigel D.

    2023  

    Abstract: High quality scanning transmission electron microscopy (STEM) data acquisition and analysis has become increasingly important due to the commercial demand for investigating the properties of complex materials such as battery cathodes; however, ... ...

    Abstract High quality scanning transmission electron microscopy (STEM) data acquisition and analysis has become increasingly important due to the commercial demand for investigating the properties of complex materials such as battery cathodes; however, multidimensional techniques (such as 4-D STEM) which can improve resolution and sample information are ultimately limited by the beam-damage properties of the materials or the signal-to-noise ratio of the result. subsampling offers a solution to this problem by retaining high signal, but distributing the dose across the sample such that the damage can be reduced. It is for these reasons that we propose a method of subsampling for 4-D STEM, which can take advantage of the redundancy within said data to recover functionally identical results to the ground truth. We apply these ideas to a simulated 4-D STEM data set of a LiMnO2 sample and we obtained high quality reconstruction of phase images using 12.5% subsampling.

    Comment: 3 pages, 2 figures
    Keywords Condensed Matter - Materials Science ; Electrical Engineering and Systems Science - Signal Processing ; Physics - Computational Physics
    Publishing date 2023-07-12
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Divalent Ion Selectivity in Capacitive Deionization with Vanadium Hexacyanoferrate

    Singh, Kaustub / Li, Guanna / Lee, Juhan / Zuilhof, Han / Mehdi, Beata L. / Zornitta, Rafael L. / de Smet, Louis C.P.M.

    Advanced Functional Materials

    Experiments and Quantum-Chemical Computations

    2021  Volume 31, Issue 41

    Abstract: Selective removal of ions from water via capacitive deionization (CDI) is relevant for environmental and industrial applications like water purification, softening, and resource recovery. Prussian blue analogs (PBAs) are proposed as an electrode material ...

    Abstract Selective removal of ions from water via capacitive deionization (CDI) is relevant for environmental and industrial applications like water purification, softening, and resource recovery. Prussian blue analogs (PBAs) are proposed as an electrode material for selectively removing cations from water, based on their size. So far, PBAs used in CDI are selective toward monovalent ions. Here, vanadium hexacyanoferrate (VHCF), a PBA, is introduced as a new electrode material in a hybrid CDI setup to selectively remove divalent cations from water. These electrodes prefer divalent Ca2+over monovalent Na+, with a separation factor, βCa/Na≈3.5. This finding contrasts with the observed monovalent ion selectivity by PBA electrodes. This opposite behavior is understood by density functional theory simulations. Furthermore, coating the VHCF electrodes with a conducting polymer (poly-pyrrole, doped with poly-styrenesulphonate) prevents the contamination of the treated water following the degradation of the electrode. This facile and modular coating method can be effortlessly extended to other PBA electrodes, limiting the extent of treated water contamination during repeated cycling. This study paves the way for tunable selectivity while extending the library of electrodes that can be successfully used in (selective) CDI.
    Keywords Prussian blue analogs ; capacitive deionization ; density functional theory ; intercalation ; ion selectivity ; simulations
    Subject code 540
    Language English
    Publishing country nl
    Document type Article ; Online
    ZDB-ID 2039420-2
    ISSN 1616-3028 ; 1616-301X
    ISSN (online) 1616-3028
    ISSN 1616-301X
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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