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Article ; Online: New analytical method for the evaluation of heterogeneity in cation compositions of dolomites by micro-XRF and Raman spectroscopies.

Morita, Mayu / Urashima, Shu-Hei / Tsuchiya, Hayato / Komatani, Shintaro / Yui, Hiroharu

Analytical sciences : the international journal of the Japan Society for Analytical Chemistry

2023 Volume 39, Issue 8, Page(s) 1279–1285

Abstract: Dolomite (CaMg( ... ...

Abstract	Dolomite (CaMg(CO
Language	English
Publishing date	2023-04-20
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	1483376-1
ISSN	1348-2246 ; 1348-2246
ISSN (online)	1348-2246
ISSN	1348-2246
DOI	10.1007/s44211-023-00333-5
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Micro-Raman spectroscopic analysis on natural carbonates: linear relations found via biaxial plotting of peak frequencies for cation substituted species.

Urashima, Shu-Hei / Nishioka, Tomoya / Yui, Hiroharu

Analytical sciences : the international journal of the Japan Society for Analytical Chemistry

2022 Volume 38, Issue 7, Page(s) 921–929

Abstract: Carbonates are ubiquitous minerals carrying important information on aqueous environments where they precipitated on the Earth and space. While their ideal chemical formulae are denoted as simple as ... ...

Abstract	Carbonates are ubiquitous minerals carrying important information on aqueous environments where they precipitated on the Earth and space. While their ideal chemical formulae are denoted as simple as MCO
MeSH term(s)	Carbonates/analysis ; Carbonates/chemistry ; Cations ; Minerals/chemistry ; Spectrum Analysis, Raman ; Thermodynamics
Chemical Substances	Carbonates ; Cations ; Minerals
Language	English
Publishing date	2022-05-18
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	1483376-1
ISSN	1348-2246 ; 1348-2246
ISSN (online)	1348-2246
ISSN	1348-2246
DOI	10.1007/s44211-022-00119-1
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Article ; Online: Local elasticity evaluation of acid-denatured collagen by photoacoustic spectroscopy.

Urashima, Shu-Hei / Kimura, Maiko / Morisaku, Toshinori / Yui, Hiroharu

Analytical sciences : the international journal of the Japan Society for Analytical Chemistry

2023 Volume 39, Issue 9, Page(s) 1567–1574

Abstract: While there are various analytical methods for elasticity evaluation, those with micrometer-order spatial resolution are still under developing. As some of biological tissues such as capillary vessels and cochlea are very small and/or highly ... ...

Abstract	While there are various analytical methods for elasticity evaluation, those with micrometer-order spatial resolution are still under developing. As some of biological tissues such as capillary vessels and cochlea are very small and/or highly heterogeneous, development of analytical techniques with such high spatial resolution has been desired for biological and medical purposes. Especially, the elasticity of capillary vessels (several micrometer in diameter) would be an important indicator to find out early diseases. To measure the local elasticity for such small and/or heterogeneous samples, we have proposed an approach based on a temporal waveform of photoacoustic (PA) signal, i.e., time-domain PA. As the time-domain PA contains both the vibrating frequency and the sound propagation time after the excitation, it provides the information on the local elasticity (from the frequency) at a specific depth (from the propagation time) of samples. In the present study, the signal from collagen sheets were obtained and analyzed as models of blood vessel walls and scaffolds for regenerative medicine. In contrast to previous studies using the agarose gel which showed a single frequency peak, the signal from the collagen sheets was mainly composed of two frequency peaks, assignable to surface and bulk vibration. Further, the bulk vibration was found to sensitively reflect the elasticity of the samples. Since the PA effect can be induced only at the position where the light absorber exists, the analytical method proposed here would allow us to measure the local elasticity and its spatial distribution in blood vessels and other tissues.
MeSH term(s)	Elasticity ; Collagen ; Vibration ; Regenerative Medicine
Chemical Substances	Collagen (9007-34-5)
Language	English
Publishing date	2023-07-11
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	1483376-1
ISSN	1348-2246 ; 1348-2246
ISSN (online)	1348-2246
ISSN	1348-2246
DOI	10.1007/s44211-023-00377-7
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Article ; Online: Real-time three-dimensional micro-imaging of liquid front in spreading sessile droplet under transient spreading states.

Urashima, Shu-Hei / Tanitsu, Makoto / Kawamoto, Masanobu / Yui, Hiroharu

Analytical sciences : the international journal of the Japan Society for Analytical Chemistry

2023 Volume 40, Issue 1, Page(s) 75–83

Abstract: Dynamic wetting behaviors of sessile droplets on substrates play crucial roles for various industrial chemical processes. In the case of complete wetting, it has been proposed that a precursor film which is nanometer-order thickness and micrometer-order ... ...

Abstract	Dynamic wetting behaviors of sessile droplets on substrates play crucial roles for various industrial chemical processes. In the case of complete wetting, it has been proposed that a precursor film which is nanometer-order thickness and micrometer-order length further expands outside the macroscopic contact line of the sessile droplet. While the time evolution of the precursor film is believed to strikingly affect the macroscopic wetting behavior (e.g., spreading velocity), it had been hard to visualize the three-dimensional shape of the precursor film at the early stage of wetting. Further, although the spreading velocity rapidly decreases upon time at the early stage of the wetting (transient state) and then converged to be a constant at later time (steady state), conventional fluid mechanics theories generally describe only the wetting behavior at the steady state. Therefore, experimental observation of time evolution of the precursor film shape in the transient state is essential to proceed the theories to the next step. Here, a monochromatic laser interference microscope was developed to visualize three-dimensional shape of the wetting front of sessile droplets in real time. By detecting an interference of the laser reflected at the liquid and substrate surfaces, the precursor film was successfully visualized with a time resolution of 20 ms and a thickness resolution of about 3.5 nm at worst. For 10 cSt silicone oil on Si substrate, a 60-nm-thick and 70-μm-long precursor film was observed for 2-10 min after dropping and its spreading velocity which decreased with time was quantitatively analyzed.
Language	English
Publishing date	2023-10-15
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	1483376-1
ISSN	1348-2246 ; 1348-2246
ISSN (online)	1348-2246
ISSN	1348-2246
DOI	10.1007/s44211-023-00432-3
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Article ; Online: Real-time observation of the precursor film for low viscosity liquids spreading on solid substrates by a customized differential laser interference microscopy.

Kawamoto, Masanobu / Urashima, Shu-Hei / Banno, Motohiro / Yui, Hiroharu

Analytical sciences : the international journal of the Japan Society for Analytical Chemistry

2023 Volume 39, Issue 8, Page(s) 1327–1332

Abstract: While static wettability is well treated with Young's equation via its static contact angle, theoretical analyses for wetting dynamics are not yet reaching consensus due to a singularity of the spreading forces worked at the vapor/liquid/solid contact ... ...

Abstract	While static wettability is well treated with Young's equation via its static contact angle, theoretical analyses for wetting dynamics are not yet reaching consensus due to a singularity of the spreading forces worked at the vapor/liquid/solid contact line. One plausible explanation to overcome the singularity problem is that there is a so-called precursor film spreading outside the apparent contact line. After its first finding in 1919, many researchers have attempted to visualize its shape. However, because its length and thickness are as small as micrometer and nanometer-order, respectively, its visualization still remains a challenging issue especially for low-viscosity liquids. In the present study, we developed a differential laser interference microscope, which has a thickness resolution of approximately 2 nm at the best, and applied it to the wetting front of 10 cSt of silicone oil spreading on a silicon wafer with an almost constant spreading velocity. As a result, the precursor film of 14 µm long and 108 nm thick was clearly visualized. While the macro contact line has a finite advancing contact angle of 4.0°, the gradient of the precursor film surface gradually decreased and converged to ~ 0.1° at the micro-contact angle. The shape of the precursor film was independent of the time after the dropping for the range of 600 s ± 10%, which is consistent to theoretical estimation. The present study demonstrated that our interferometer simultaneously achieved nanometer thickness resolutions, micrometer in-plane spatial resolution, and at least a millisecond temporal resolution with a simple optical setup.
Language	English
Publishing date	2023-04-27
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	1483376-1
ISSN	1348-2246 ; 1348-2246
ISSN (online)	1348-2246
ISSN	1348-2246
DOI	10.1007/s44211-023-00342-4
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Article ; Online: Non-destructive estimation of the cation composition of natural carbonates by micro-Raman spectroscopy.

Urashima, Shu-Hei / Morita, Mayu / Komatani, Shintaro / Yui, Hiroharu

Analytica chimica acta

2023 Volume 1242, Page(s) 340798

Abstract: Carbonates play a crucial role in the water and carbon cycles of both geochemical and cosmochemical environments. As carbonates do not exist homogeneously with other minerals in rocks and sands of various sizes, an analytical method that simultaneously ... ...

Abstract	Carbonates play a crucial role in the water and carbon cycles of both geochemical and cosmochemical environments. As carbonates do not exist homogeneously with other minerals in rocks and sands of various sizes, an analytical method that simultaneously satisfies non-destructivity and high spatial resolution has been desired. Further, the ability of semi-quantitative analysis with carbonates-selectivity and without any pre-treatments is added, for its applicability would be extended to remote sensing for deep sea and outer spaces. Here, we focused on the application of micro-Raman spectroscopy, where the vibrational wavenumbers of the translational (T) and librational (L) modes of carbonates are sensitively related to their cation composition. By comparing the semi-quantitative information obtained by X-ray fluorescence spectroscopy, it was found that these vibrational wavenumbers are approximately linearly related to the cation composition. Consequently, a conversion matrix was proposed to estimate the cation composition from the T and L mode vibrational wavenumbers. This method is universally applicable to any cation composition in carbonates, with no background information on the analyte required. To improve the accuracy, conversion matrices were further optimized to three solid-solution series of carbonates. It is worth noting that the proposed conversion matrices are free from matrix effects and do not depend on the total amount of carbonate in a sample. Therefore, the proposed method provides a useful analytical basis for remote sensing of the cation composition of carbonates, both in terrestrial and extra-terrestrial environments.
Language	English
Publishing date	2023-01-03
Publishing country	Netherlands
Document type	Journal Article
ZDB-ID	1483436-4
ISSN	1873-4324 ; 0003-2670
ISSN (online)	1873-4324
ISSN	0003-2670
DOI	10.1016/j.aca.2023.340798
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Article ; Online: A hydrogen-bonding structure in self-formed nanodroplets of water adsorbed on amorphous silica revealed

Urashima, Shu-Hei / Uchida, Taku / Yui, Hiroharu

Physical chemistry chemical physics : PCCP

2020 Volume 22, Issue 46, Page(s) 27031–27036

Abstract: Water adsorption onto a material surface is known to change macroscopic surface properties such as wettability and friction coefficient. While the role of the adsorbed water has been discussed for a long time, the interfacial structure of the adsorbed ... ...

Abstract	Water adsorption onto a material surface is known to change macroscopic surface properties such as wettability and friction coefficient. While the role of the adsorbed water has been discussed for a long time, the interfacial structure of the adsorbed water has not been fully recognized in many cases. In this study, the hydration structure of water adsorbed on a vapor/silica interface at room temperature was studied via heterodyne-detected vibrational sum-frequency generation spectroscopy. The vibrational spectra of the interfacial molecules obtained here were different from those estimated via conventional sum-frequency generation spectroscopy. Interestingly, our results suggest that, at low humidity, the adsorbed water on silica forms nanodroplets instead of a uniform film. Because no silanol group was found to be hydrogen-bonding free, it was concluded that water molecules gather around the silanol group to form strongly hydrogen-bonded droplets. At high humidity, while the adsorbed water partially behaves like a bulk liquid, deprotonation of the silanol was not observed, unlike the case of silica surfaces in contact with bulk liquid water.
Language	English
Publishing date	2020-11-19
Publishing country	England
Document type	Journal Article
ZDB-ID	1476244-4
ISSN	1463-9084 ; 1463-9076
ISSN (online)	1463-9084
ISSN	1463-9076
DOI	10.1039/d0cp03207g
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Article ; Online: Laser-induced surface deformation microscope for the study of the dynamic viscoelasticity of plasma membrane in a living cell.

Morisaku, Toshinori / Yui, Hiroharu

The Analyst

2018 Volume 143, Issue 10, Page(s) 2397–2404

Abstract: A laser-induced surface deformation (LISD) microscope is developed and applied to measurement of the dynamic relaxation responses of the plasma membrane in a living cell. A laser beam is tightly focused on an optional area of cell surface and the focused ...

Abstract	A laser-induced surface deformation (LISD) microscope is developed and applied to measurement of the dynamic relaxation responses of the plasma membrane in a living cell. A laser beam is tightly focused on an optional area of cell surface and the focused light induces microscopic deformation on the surface via radiation pressure. The LISD microscope not only allows non-contact and destruction-free measurement but provides power spectra of the surface responses depending on the frequency of the intensity of the laser beam. An optical system for the LISD is equipped via a microscope, allowing us to measure the relaxation responses in sub-cellular-sized regions of the plasma membrane. In addition, the forced oscillation caused by the radiation pressure for surface deformation extends the upper limit of the frequency range in the obtained power spectra to 106 Hz, which enables us to measure relaxation responses in local regions within the plasma membrane. From differences in power-law exponents at higher frequencies, it is realized that a cancerous cell obeys a weaker single power-law than a normal fibroblast cell. Furthermore, the power spectrum of a keratinocyte cell obeys a power-law with two exponents, indicating that alternative mechanical models to a conventional soft glassy rheology model (where single power-laws explain cells' responses below about 103 Hz) are needed for the understanding over a wider frequency range. The LISD microscope would contribute to investigation of microscopic cell rheology, which is important for clarifying the mechanisms of cell migration and tissue construction.
MeSH term(s)	3T3 Cells ; Animals ; Cell Membrane/physiology ; Elasticity ; HeLa Cells ; Humans ; Keratinocytes/physiology ; Lasers ; Mice ; Pressure ; Rheology ; Viscosity
Language	English
Publishing date	2018-04-27
Publishing country	England
Document type	Journal Article
ZDB-ID	210747-8
ISSN	1364-5528 ; 0003-2654
ISSN (online)	1364-5528
ISSN	0003-2654
DOI	10.1039/c7an01620d
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Article ; Online: Structural Discrimination between Aβ(1-40) and Aβ(1-42) Peptides in Films with Vibrational Circular Dichroism Spectroscopy.

Morisaku, Toshinori / Yui, Hiroharu

Analytical sciences : the international journal of the Japan Society for Analytical Chemistry

2017 Volume 33, Issue 1, Page(s) 79–82

Abstract: The secondary structure of full-length Aβ(1-40) and Aβ(1-42) peptides in films has been investigated with IR and vibrational circular dichroism (VCD) spectroscopy. From IR spectra, it is shown that the prepared films of Aβ(1-40) and Aβ(1-42) mainly ... ...

Abstract	The secondary structure of full-length Aβ(1-40) and Aβ(1-42) peptides in films has been investigated with IR and vibrational circular dichroism (VCD) spectroscopy. From IR spectra, it is shown that the prepared films of Aβ(1-40) and Aβ(1-42) mainly comprise the β-sheet conformation that is characteristic of aggregated and fibrous Aβ. In the VCD spectra, the Aβ(1-42) film shows an intense and sharp band with left-handed optical activity at around 1625 cm
Language	English
Publishing date	2017
Publishing country	Japan
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	1483376-1
ISSN	1348-2246 ; 0910-6340
ISSN (online)	1348-2246
ISSN	0910-6340
DOI	10.2116/analsci.33.79
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Article ; Online: Stimulated Raman Scattering Interferometer for Molecular-Selective Tomographic Imaging.

Banno, Motohiro / Yui, Hiroharu

Applied spectroscopy

2017 Volume 71, Issue 7, Page(s) 1677–1683

Abstract: Development of a stimulated Raman scattering (SRS) interferometer is presented. In the apparatus, a SRS signal generated in a sample is collinearly overlapped with a reference beam, and the interference pattern between the signal and reference beams is ... ...

Abstract	Development of a stimulated Raman scattering (SRS) interferometer is presented. In the apparatus, a SRS signal generated in a sample is collinearly overlapped with a reference beam, and the interference pattern between the signal and reference beams is obtained. From the interference pattern, the phase of the SRS signal can be measured. From the phase of the signal, the spatial distribution of the target molecule can be obtained with high positioning precision. In the present article, the SRS interferometer was developed and the first SRS interference signal was obtained from a polyethylene film. The phase change of the SRS interference pattern caused by scanning the sample position along the direction of the incident light propagation was measured. From the result, the sample position difference for a sub-micron was detected with uncertainties of 15%. The tomographic images of a triple-layered polymer film were successfully obtained. The SRS interferometer would become a core optical technique of a novel molecular-selective tomographic imaging method.
Language	English
Publishing date	2017-07
Publishing country	United States
Document type	Journal Article
ISSN	1943-3530
ISSN (online)	1943-3530
DOI	10.1177/0003702817693232
Database	MEDical Literature Analysis and Retrieval System OnLINE

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