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Journal Articles

Soft, skin-interfaced microfluidic systems with integrated immunoassays, fluorometric sensors, and impedance measurement capabilities

Kim, S.*; Lee, B.*; Reeder, J. T.*; Seo, S. H.*; Lee, S.-U.*; Hourlier-Fargette, A.*; Shin, J.*; Sekine, Yurina; Jeong, H.*; Oh, Y. S.*; et al.

Proceedings of the National Academy of Sciences of the United States of America, 117(45), p.27906 - 27915, 2020/11

 Times Cited Count:9 Percentile:76.81(Multidisciplinary Sciences)

In this study, we present a wireless, battery-free, skin-interfaced microfluidic system that combines lateral flow immunoassay for sweat cortisol assay, fluorometric imaging of glucose and ascorbic acid (vitamin C) assays, and digital tracking of sweat rate using electrodes that measure skin galvanic response. Systematic benchtop testing and on-body field studies on human subjects exercising in a gym environment highlight the key multifunctional features of this platform in tracking the biochemical correlates of physical stress.

Journal Articles

Soft, skin-interfaced microfluidic systems with wireless, battery-free electronics for digital, real-time tracking of sweat loss and electrolyte composition

Kim, S. B.*; Lee, K.-H.*; Raj, M. S.*; Reeder, J. T.*; Koo, J.*; Hourlier-Fargette, A.*; Bandodkar, A. J.*; Won, S. M.*; Sekine, Yurina; Choi, J.*; et al.

Small, 14(45), p.1802876_1 - 1802876_9, 2018/11

 Times Cited Count:41 Percentile:92.78(Chemistry, Multidisciplinary)

Excretion of sweat from eccrine glands is a dynamic physiological process that varies with body position, activity level, and health status. Information content embodied in sweat rate and chemistry can be used to assess health status and athletic performance. This paper presents a thin, miniaturized, skin-interfaced microfluidic technology that includes a reusable, battery-free electronics module for measuring sweat conductivity and rate in real-time using wireless power from and data communication with capabilities in near field communications (NFC). Systematic studies of these combined microfluidic/electronic systems, accurate correlations of measurements performed with them to those of laboratory standard instrumentation, and field tests on human subjects establish the key operational features and their utility in sweat analytics.

Journal Articles

Super-absorbent polymer valves and colorimetric chemistries for time-sequenced discrete sampling and chloride analysis of sweat via skin-mounted soft microfluidics

Kim, S. B.*; Zhang, Y.*; Won, S. M.*; Bandodkar, A. J.*; Sekine, Yurina; Xue, Y.*; Koo, J.*; Harshman, S. W.*; Martin, J. A.*; Park, J. M.*; et al.

Small, 14(12), p.1703334_1 - 1703334_11, 2018/03

 Times Cited Count:47 Percentile:94.29(Chemistry, Multidisciplinary)

Journal Articles

"Relative rates method" for evaluating the effect of potential geological environmental change due to uplift/erosion to radionuclide migration of high-level radioactive waste

Ebashi, Takeshi; Kawamura, Makoto*; Inagaki, Manabu*; Koo, Shigeru*; Shibata, Masahiro; Itazu, Toru; Nakajima, Kunihiko*; Miyahara, Kaname; Apted, M. J.*

Materials Research Society Symposium Proceedings, Vol.1665, p.39 - 45, 2014/07

In Japan, the likelihood of uplift/erosion on repository performance and waste isolation can be typically greatly reduced or excluded by careful siting, however, the inability to completely exclude the uplift/erosion scenario may require an analysis of the consequences of such a scenario. For this purpose, an assessment approach has been developed to more realistically treat the effect of uplift/erosion for a hypothetical repository located in sedimentary host rock. A key advantage to this approach is the extrapolation of the geohistory of modern analogue sites to develop credible initial inputs for future volunteer sites that may be poorly characterized at the initial stages of site investigation. In addition, the approach provides a systematic basis for bounding the range of possible evolution in thermal-hydrological-mechanical-chemical conditions of a repository experiencing different uplift/ erosion rates.

Journal Articles

Low energy vibrational excitations characteristic of superionic glass

Nakamura, Mitsutaka; Iwase, Hiroki; Arai, Masatoshi; Kartini, E.*; Russina, M.*; Yokoo, Tetsuya*; Taylor, J. W.*

Physica B; Condensed Matter, 385-386(1), p.552 - 554, 2006/11

 Times Cited Count:3 Percentile:18.82(Physics, Condensed Matter)

The mechanism of high ionic conductivity in superionic glass constitute an unsolved problem in the field of science.Here we performed inelastic neutron scattering measurements of superionic glass system (AgI)$$_{x}$$(Ag$$_{2}$$S)$$_{x}$$(AgPO$$_{3}$$)$$_{1-2x}$$ by using MARI spectrometer at ISIS, and found that the $$Q$$-dependence of inelastic intensity in the energy region from 1 to 3 meV of superionic phase glass shows an excess intensity above $$Q$$=1.8$AA$^{-1}$$ compared with insulator phase one. Similar phenomena were also observed in another superionic glass (AgI)$$_{0.5}$$(AgPO$$_{3}$$)$$_{0.5}$$ by using NEAT spectrometer at HMI with high resolution measurement. These results clearly suggest peculiar low energy vibrational excitations should be universal features of superionic glass.

Oral presentation

Polarised neutron spectrometer, POLANO, at J-PARC attempts at understanding novel magnetism

Oyama, Kenji*; Yokoo, Tetsuya*; Ito, Shinichi*; Suzuki, Junichi*; Iwasa, Kazuaki*; Sato, Taku*; Kira, Hiroshi*; Sakaguchi, Yoshifumi*; Ino, Takashi*; Oku, Takayuki; et al.

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