Structure investigation of β-D-fructose crystal under high pressure: Raman scattering, IR absorption, and synchrotron X-ray diffraction

Yao, Xueshuang; Fu, Chao; Cheng, Liang

doi:10.1016/j.molstruc.2020.128746

Cited by 6 publications

(3 citation statements)

References 25 publications

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“…The fructose molecule is selected because it has a considerably smaller Raman cross-section than those of other model molecules frequently used in conventional Raman experiments and does not form covalent bonds with Au. As shown in Figure d, e, a distinctive Raman transition of fructose at 1250 cm –1 , assigned to the twisting of CH 2 , is clearly observed only for the AuNR with tip-selectively grown SiO 2 -on-Au film, whereas no Raman transition is observed for the other substrates.…”

Section: Results and Discussionmentioning

confidence: 99%

Water-Wettable Open Plasmonic Nanocavities for Ultrasensitive Molecular Detections in Multiple Phases

Whang

Lee

et al. 2021

Nano Lett.

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Plasmonic nanocavities between metal nanoparticles on metal films are either hydrophobic or fully occupied by nonmetallic spacers, preventing molecular diffusion into electromagnetic hotspots. Here we realize water-wettable open plasmonic cavities by devising gold nanoparticle with site-selectively grown ultrathin dielectric layer-on-gold film structures. We directly confirm that hydrophilic dielectric layers of SiO 2 or TiO 2 , which are formed only at the tips of gold nanorod via precise temperature control, render sub-10 nm cavities open to the surroundings and completely water-wettable. Simulations reveal that spontaneous wetting in our cavities is driven by the presence of tip-selective hydrophilic layer and tendency of minimizing high energy air/ water interface inside the cavities. Our plasmonic cavities show significant Raman enhancement of up to 4 orders of magnitude higher than those of conventional ones for molecules in various media. Our findings will offer new opportunities for sensing applications of plasmonic nanocavities and have huge impacts on cavity plasmonics.

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Section: Results and Discussionmentioning

confidence: 99%

Water-Wettable Open Plasmonic Nanocavities for Ultrasensitive Molecular Detections in Multiple Phases

Whang

Lee

et al. 2021

Nano Lett.

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“…A higher oxygen flow rate to the APPJ can remove surface-adsorbed species [25] and even etch the polystyrene polymer thin films due to its high reactivity induced by the reactive species [36,37] The evolution of the surface species located at 1900-1000 cm −1 is also provided in figure 4(c). During the ignition of CH 4 /O 2 /Ar plasma, absorption bands at 1590 cm −1 (carboxylate [38,39]), 1420 cm −1 (C-O-H group [40] or CH 2 [41]), and 1280 cm −1 (carbonate [42]) emerged, as the reaction took place. Upon the ignition of O 2 /Ar plasma, the 1590 cm −1 and 1420 cm −1 bands decreased and the 1280 cm −1 band did not show obvious changes due to exposure to the O 2 /Ar plasma.…”

Section: Investigation Of the Catalyst Activationmentioning

confidence: 99%

Investigation of Ni catalyst activation during plasma-assisted methane oxidation

Li¹,

Hinshelwood²,

Oehrlein³

2022

J. Phys. D: Appl. Phys.

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Atmospheric pressure plasma has shown promise in improving thermally activated catalytic reactions through a process termed plasma-catalysis synergy. In this work, we investigated atmospheric pressure plasma jet (APPJ)-assisted CH4 oxidation over a Ni/SiO2.Al2O3 catalyst. Downstream gas-phase products from CH4 conversion were quantified by Fourier transform infrared spectroscopy (FTIR). The catalyst near-surface region was characterized by in-situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The catalyst was observed to be activated at elevated temperature (500 °C) if it was exposed to the APPJ operated at large plasma power. “Catalyst activation” signifies that the purely thermal conversion of CH4 using catalysts which had been pre-exposed to plasma became more intense and produced consistently CO product, even if the plasma was extinguished. Without the application of the APPJ to the Ni catalyst surface this was not observed at 500 °C. The study of different exposure conditions of the activated catalyst indicates that the reduction of the catalyst by the APPJ is likely the cause of the catalyst activation. We also observed a systematic shift of the vibrational frequency of adsorbed CO on Ni catalyst when plasma operating conditions and catalyst temperatures were varied and discussed possible explanations for the observed changes. This work provides insights into the plasma-catalyst interaction, especially catalyst modification in the plasma catalysis process, and potentially demonstrates the possibility of utilizing the surface CO as a local probe to understand the plasma-catalyst interaction and shed light on the complexity of plasma catalysis.

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“…Hydrogen bonds and intermolecular contacts can considerably change under pressure, which can affect the strength and nature of interactions Tomkowiak & Katrusiak, 2019;Resnati et al, 2015;Bhatt et al, 2016). Structural phase transitions induced by pressure were described for d-sucrose (Patyk et al, 2012), -d-glucose , -d-mannose (Patyk-Kaźmierczak et al, 2016) and -d-fructose (Yao et al, 2020). It was concluded that small voids present in the ambient-pressure structures of these crystals collapse under sufficiently high pressure, which triggers transformations of the O-HÁ Á ÁO hydrogen-bonding patterns.…”

Section: Introductionmentioning

confidence: 99%

Structure–property relationships of molecular shape and orientation with compression and expansion of xylitol

Safari

Katrusiak

2021

Acta Crystallogr Sect B

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Easy crystallization distinguishes xylitol from other sugars, which usually condense into a syrup from aqueous solution. Although two polymorphs, i.e. metastable monoclinic and high-density orthorhombic, have been reported for xylitol, only the latter is in practical use. Under high pressure, the same orthorhombic phase has been obtained by both isothermal and isochoric recrystallization. The stability of the orthorhombic xylitol phase to 5.0 GPa has been correlated with a uniform compression of all hydrogen bonds and some flexibility of the molecular conformation, which cushion the pressure-induced local strains. The anisotropic compressibility of xylitol and its thermal expansion are consistent with the rule of inverse effects of pressure and temperature. This inverse strain relationship has been correlated with the dimensions and orientation of xylitol molecules in the crystal structure.

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Structure investigation of β-D-fructose crystal under high pressure: Raman scattering, IR absorption, and synchrotron X-ray diffraction

Cited by 6 publications

References 25 publications

Water-Wettable Open Plasmonic Nanocavities for Ultrasensitive Molecular Detections in Multiple Phases

Water-Wettable Open Plasmonic Nanocavities for Ultrasensitive Molecular Detections in Multiple Phases

Investigation of Ni catalyst activation during plasma-assisted methane oxidation

Structure–property relationships of molecular shape and orientation with compression and expansion of xylitol

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