X-ray induced dimerization of cinnamic acid: Time-resolved inelastic X-ray scattering study

Inkinen, Juho; Niskanen, Johannes; Talka, Tuomas; Sahle, Christoph J.; Müller, H.; Khriachtchev, Leonid; Hashemi, Javad; Akbari, Ali; Hakala, Mikko; Huotari, Simo

doi:10.1038/srep15851

Cited by 20 publications

(19 citation statements)

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“…Even though the named factorization schemes are mathematically well defined, they are not guaranteed to yield physically meaningful results. However, for the purpose of finding the correct pixels inside a given rough ROI, this approach is well suited and, as was shown earlier (Inkinen et al, 2015;Niskanen et al, 2016), under certain circumstances, NNMF components can directly be related to physical spectra. In Fig.…”

Section: Roi Selectionmentioning

confidence: 99%

Direct tomography imaging for inelastic X-ray scattering experiments at high pressure

et al. 2017

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A method to separate the non-resonant inelastic X-ray scattering signal of a micro-metric sample contained inside a diamond anvil cell (DAC) from the signal originating from the high-pressure sample environment is described. Especially for high-pressure experiments, the parasitic signal originating from the diamond anvils, the gasket and/or the pressure medium can easily obscure the sample signal or even render the experiment impossible. Another severe complication for high-pressure non-resonant inelastic X-ray measurements, such as X-ray Raman scattering spectroscopy, can be the proximity of the desired sample edge energy to an absorption edge energy of elements constituting the DAC. It is shown that recording the scattered signal in a spatially resolved manner allows these problems to be overcome by separating the sample signal from the spurious scattering of the DAC without constraints on the solid angle of detection. Furthermore, simple machine learning algorithms facilitate finding the corresponding detector pixels that record the sample signal. The outlined experimental technique and data analysis approach are demonstrated by presenting spectra of the Si L 2,3 -edge and O K-edge of compressed -quartz. The spectra are of unprecedented quality and both the O K-edge and the Si L 2,3 -edge clearly show the existence of a pressure-induced phase transition between 10 and 24 GPa.

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Section: Roi Selectionmentioning

confidence: 99%

Direct tomography imaging for inelastic X-ray scattering experiments at high pressure

et al. 2017

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“…This point-to-point focusing generates an image of the sample and sample environment, projected onto the detector with an intensity contrast according to the corresponding XRS cross section (see for details 51 , 52 ). We exploit the imaging properties of XRS (see 51 , 53 , 54 , 55 ) to separate the sample signal from the complex background, which consists of contributions from either diamonds and/or the gasket, which is exemplified in Fig. 1(b–d) and is discussed in the methods section.…”

Section: Resultsmentioning

confidence: 99%

Pressure driven spin transition in siderite and magnesiosiderite single crystals

Weis

Sternemann

Cerantola

et al. 2017

Sci Rep

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Iron-bearing carbonates are candidate phases for carbon storage in the deep Earth and may play an important role for the Earth’s carbon cycle. To elucidate the properties of carbonates at conditions of the deep Earth, we investigated the pressure driven magnetic high spin to low spin transition of synthetic siderite FeCO3 and magnesiosiderite (Mg0.74Fe0.26)CO3 single crystals for pressures up to 57 GPa using diamond anvil cells and x-ray Raman scattering spectroscopy to directly probe the iron 3d electron configuration. An extremely sharp transition for siderite single crystal occurs at a notably low pressure of 40.4 ± 0.1 GPa with a transition width of 0.7 GPa when using the very soft pressure medium helium. In contrast, we observe a broadening of the transition width to 4.4 GPa for siderite with a surprising additional shift of the transition pressure to 44.3 ± 0.4 GPa when argon is used as pressure medium. The difference is assigned to larger pressure gradients in case of argon. For magnesiosiderite loaded with argon, the transition occurs at 44.8 ± 0.8 GPa showing similar width as siderite. Hence, no compositional effect on the spin transition pressure is observed. The spectra measured within the spin crossover regime indicate coexistence of regions of pure high- and low-spin configuration within the single crystal.

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“…Photo-dimerizable or crosslinkable groups including cinnamic, coumarin, and anthracene can undergo a crosslinking reaction via [2+2] cycloaddition of the carbon-carbon double bonds after UV-irradiation [ 79 , 80 , 81 ]. They have been mainly utilized for the photo-crosslinking of micelles, leading to micelles or nanogels with enhanced colloidal stability, even in very dilute condition [ 82 , 83 , 84 ].…”

Section: Photo-chemistry Of Light-responsive Polypeptide Nanopartimentioning

confidence: 99%

Progress in Photo-Responsive Polypeptide Derived Nano-Assemblies

Tang

Sun

2018

Micromachines

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Stimuli-responsive polymeric materials have attracted significant attention in a variety of high-value-added and industrial applications during the past decade. Among various stimuli, light is of particular interest as a stimulus because of its unique advantages, such as precisely spatiotemporal control, mild conditions, ease of use, and tunability. In recent years, a lot of effort towards the synthesis of a biocompatible and biodegradable polypeptide has resulted in many examples of photo-responsive nanoparticles. Depending on the specific photochemistry, those polypeptide derived nano-assemblies are capable of crosslinking, disassembling, or morphing into other shapes upon light irradiation. In this review, we aim to assess the current state of photo-responsive polypeptide based nanomaterials. Firstly, those ‘smart’ nanomaterials will be categorized by their photo-triggered events (i.e., crosslinking, degradation, and isomerization), which are inherently governed by photo-sensitive functionalities, including O-nitrobenzyl, coumarin, azobenzene, cinnamyl, and spiropyran. In addition, the properties and applications of those polypeptide nanomaterials will be highlighted as well. Finally, the current challenges and future directions of this subject will be evaluated.

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X-ray induced dimerization of cinnamic acid: Time-resolved inelastic X-ray scattering study

Cited by 20 publications

References 40 publications

Direct tomography imaging for inelastic X-ray scattering experiments at high pressure

Direct tomography imaging for inelastic X-ray scattering experiments at high pressure

Pressure driven spin transition in siderite and magnesiosiderite single crystals

Progress in Photo-Responsive Polypeptide Derived Nano-Assemblies

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