Article
Chemistry, Physical
Junsuke Yamanishi, Yan Jun Li, Yoshitaka Naitoh, Yasuhiro Sugawara
Summary: This review introduces the operating principle and applications of photoinduced force microscopy (PiFM), including the gradient force, scattering force, and methods to eliminate photothermal effects. Two PiFM operating modes, in air based on the tapping mode and in vacuum based on the frequency modulation (FM) mode, are discussed along with the measurement results of SiNc clusters and semiconductor quantum dots.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C-PHOTOCHEMISTRY REVIEWS
(2022)
Article
Chemistry, Multidisciplinary
Yuji Yamagishi, Hiroaki Kominami, Kei Kobayashi, Yuki Nomura, Emiko Igaki, Hirofumi Yamada
Summary: In this study, the molecular-scale solvation structures at the electrolyte-mica interface were measured using FM-AFM. The effective size of molecular assemblies formed at the interface increased with increasing ion concentrations, as shown by both experimental results and molecular dynamics simulations.
Article
Chemistry, Physical
Hua Li, Yunxiao Zhang, Seamus Jones, Rachel Segalman, Gregory G. Warr, Rob Atkin
Summary: The research indicates that polymeric cations can adsorb onto the Au(1 1 1) electrode to form a boundary layer, and the properties of this boundary layer can be tuned by potential. Experimental results show that adsorption of polymeric cations, conformation of polymeric cation chains, and lateral forces of the boundary layer all vary at different potentials.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Engineering, Mechanical
Xiuhua Qiu, Linghong Lu, Zhenyu Qu, Jiongtao Liao, Qi Fan, Faiz Ullah Shah, Wenling Zhang, Rong An
Summary: The study found that higher IL concentration in the IL-oil mixtures led to the formation of ordered IL-rich layers on the titanium surface, which facilitated the reduction of nanoscale friction. In contrast, lower concentration mixtures could not form complete boundary layers, resulting in less efficient friction reduction.
Article
Physics, Applied
Yifan Bao, Mitsunori Kitta, Takashi Ichii, Toru Utsunomiya, Hiroyuki Sugimura
Summary: This study utilized frequency modulation atomic force microscopy to investigate the interfacial structures between an IL and a LIB electrode, successfully visualizing solvation structures at the interface. Electrochemical impedance spectroscopy measurement was also conducted to measure the rate of Li-ion insertion/extraction on the interface.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Byung I. Kim, Ryan D. Boehm, Harrison Agrusa
Summary: This study analyzed ten downward portions in the large oscillatory force-distance curve to understand the behavior of a nanoscale water meniscus confined between a sharp probe and a flat substrate in air. The analysis revealed that each downward portion occurs due to a coil-to-bridge transition of self-assembled water chains. These findings provide new insights into the unique properties of water.
Article
Chemistry, Physical
Xiaozhou Huang, Erin Witherspoon, Rui He, Yaonian Li, Jingjiang Yu, Jinghao Huang, Chao Luo, Matthew Li, Tongchao Liu, Khalil Amine, Qiliang Li, Zhe Wang, Pei Dong
Summary: It has been confirmed that single-walled carbon nanotubes (SWCNTs) can generate reactive oxygen species in aprotic media by utilizing photon energy. The impact of photon irradiation on SWCNTs and the kinetics of the generation process in aprotic media are still unclear, limiting the yield performance. In this study, the kinetics for photodynamic effects were investigated by characterizing ultraviolet-treated SWCNTs using various techniques. The results showed that ultraviolet-treated SWCNTs had more defects, lower conductivity, and less surface charge after energy conversion. The dispersion, chirality, and structural integrity of SWCNTs were found to be important for achieving high-performance photodynamic effects.
MATERIALS TODAY ENERGY
(2023)
Article
Chemistry, Multidisciplinary
Jolien Bertouille, Sandor Kasas, Charlotte Martin, Ulrich Hennecke, Steven Ballet, Ronnie G. G. Willaert
Summary: Peptide-based hydrogels have potential applications in wound healing, drug delivery, and tissue engineering. The physical properties of these materials depend on their gel network morphology, but the self-assembly mechanism of peptides leading to different network shapes is still debated.
Article
Chemistry, Physical
Yunxiao Zhang, Joshua B. Marlow, Wade Millar, Zachary M. Aman, Debbie S. Silvester, Gregory G. Warr, Rob Atkin, Hua Li
Summary: The novel catanionic surface-active ionic liquid (SAIL) exhibits nanostructure in bulk and at the interface, showing good lubricity. The application of potential can alter the interfacial nanostructure and lubricity.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Shuji Fujisawa, Kazuho Daicho, Ayhan Yurtsever, Takeshi Fukuma, Tsuguyuki Saito
Summary: All-atom molecular dynamics simulations and atomic force microscopy were used to study the structural dynamics of single nanocellulose during drying. It was discovered that the twist morphology of nanocellulose becomes localized along the fibril axis in the final stage of drying. Conformational changes at C6 hydroxymethyl groups and glycoside bond were also observed, indicating an increase in crystallinity during the drying process. These insights provide valuable information for understanding the nanocellulose structures in material processing and designing materials with advanced functionalities.
Article
Nanoscience & Nanotechnology
Dominik Stepien, Beatrice Wolff, Thomas Diemant, Guk-Tae Kim, Florian Hausen, Dominic Bresser, Stefano Passerini
Summary: Rechargeable lithium-metal batteries (LMBs) with zero excess lithium, requiring reversible deposition of metallic lithium, were investigated using an ionic liquid-based electrolyte and an electrolyte additive. The results showed that a higher concentration of the conducting salt led to a lower overpotential and more homogeneous deposition of lithium. The addition of the electrolyte additive further reduced the overpotential and stabilized the solid electrolyte interphase, resulting in a significantly enhanced Coulombic efficiency (CE).
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Multidisciplinary Sciences
Devin T. Edwards, Marc-Andre Leblanc, Thomas T. Perkins
Summary: Single-molecule force spectroscopy was used to study protein folding dynamics, revealing intrinsic changes in protein folding dynamics and transition state height under different pH conditions. Despite differences in destabilization mechanisms, constant-force landscapes showed minimal differences in transition state height, while force-dependent rates increased as pH decreased. This study provides insights for future AFM-based studies of mechanoresponsive proteins.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Chemistry, Multidisciplinary
Pierre H. A. Vaillant, Vaishnavi Krishnamurthi, Caiden J. Parker, Rashad Kariuki, Salvy P. Russo, Andrew J. Christofferson, Torben Daeneke, Aaron Elbourne
Summary: By using atomic force microscopy (AFM) and molecular dynamics (MD) simulations, the structure of the interface between liquid metals (LMs) and LM oxide is investigated. The results reveal distinct sub-oxide nanostructured layering in room-temperature liquid metals, providing important insights into the behavior of LM systems at interfaces.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Stephen Massicot, Afra Gezmis, Timo Talwar, Manuel Meusel, Simon Jaekel, Rajan Adhikari, Leonhard Winter, Cynthia C. Fernandez, Andreas Bayer, Florian Maier, Hans-Peter Steinrueck
Summary: In the context of ionic liquid (IL)-assisted catalysis, the adsorption and thermal evolution of [C1C1Im][Tf2N] on Pt(111) were investigated. The results show that the IL can adsorb intact at high temperatures, but decomposition reactions occur.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Physics, Multidisciplinary
Simone Benaglia, Manuel R. Uhlig, Jose Hernandez-Munoz, Enrique Chacon, Pedro Tarazona, Ricardo Garcia
Summary: This study demonstrates that the generation of 3D maps is dependent on the polarization of the tip, with differently charged tips revealing different density distributions. Experimental data reproduce key findings of the theory.
PHYSICAL REVIEW LETTERS
(2021)
Article
Spectroscopy
Masaya Imai, Ichiro Tanabe, Taiki Sato, Ken-ichi Fukui
Summary: This study investigated the dynamics of ionic liquids at the electrochemical interface using attenuated total reflectance far- and deep-ultraviolet spectroscopy. By measuring the absorption spectra and comparing the relaxation times at different wavelengths, it was found that the molecular conformations of the interfacial ionic liquids changed slowly, which can be attributed to the potential-dependent interfacial orientations.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Chemistry, Multidisciplinary
Yusuke Morino, Ken-Ichi Fukui
Summary: By using a self-assembled monolayer (SAM) electrode and in situ Raman spectroscopy, this study elucidates the microscopic charge/discharge mechanism at the interface of the electrolyte and organic cathode active material in lithium-ion batteries. The results reveal an asymmetric lithiation/delithiation mechanism.
Article
Chemistry, Physical
Masaya Imai, Ichiro Tanabe, Yukihiro Ozaki, K. Fukui
Summary: This study investigated the solvation structures of silver ions in N-butyl-N-methylpyrrolidinium dicyanamide ([BMP][DCA]) using attenuated total reflectance-ultraviolet spectroscopy. The addition of Ag+ caused a red-shift in the absorption band of [DCA]-, opposite to the shift caused by Li+. Multivariate analysis and molecular dynamics simulations revealed that the coordination number of [DCA]- around Ag+ was approximately five.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Chemistry, Physical
Yuzu Kobayashi, Yasuyuki Yokota, Raymond A. Wong, Misun Hong, Jun Takeya, Saho Osawa, Fumitaka Ishiwari, Yoshiaki Shoji, Takashi Harimoto, Keisuke Sugimoto, Yusuke Ishigaki, Takanori Suzuki, Takanori Fukushima, Yousoo Kim
Summary: This study successfully tracked the electronic-state changes of redox reactions at the single-molecule level using electrochemical scanning tunneling microscopy (EC-STM). By synthesizing and fabricating a structurally rigid tripodal molecule, a constant distance between the electrode and the reactant was maintained, enabling the visualization of electronic-state changes of individual reactants. This methodology opens up possibilities for versatile single-molecule measurements of important phenomena at the solid-liquid interface, such as photochemistry and heterogeneous catalysis.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Ashuya Takemoto, Teppei Araki, Kazuya Nishimura, Mihoko Akiyama, Takafumi Uemura, Kazuki Kiriyama, Johan M. Koot, Yuko Kasai, Naoko Kurihira, Shuto Osaki, Shin-ichi Wakida, Jaap M. J. den Toonder, Tsuyoshi Sekitani
Summary: Fully transparent, ultrathin, and flexible organic electrochemical transistors (OECTs) were successfully developed using the additive integration processes of selective-wetting deposition and thermally bonded lamination. These OECTs demonstrate high visible transmittance and high transconductance, with low-voltage operations. EEG acquisition and nitrate ion sensing can be performed while wearing the transparent OECTs, and simultaneous assessments of optical blood flowmetry are also compatible.
Article
Chemistry, Physical
Yusuke Morino, Hikaru Sano, Koji Kawamoto, Hiroyuki Higuchi, Noriyuki Yamamoto, Atsunori Matsuda, Ken-ichi Fukui, Atsushi Sakuda, Akitoshi Hayashi
Summary: Sulfide-based solid electrolytes have high lithium-ion conductivities, but react strongly with moisture, resulting in toxic gas generation and reduced conductivity. This study investigates the changes in a glass-ceramic sulfide-based solid electrolyte before and after exposure to moisture, focusing on surface chemical species and adsorbed water. Moisture exposure decreases lithium-ion conductivity due to water adsorption onto the electrolyte surface.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Shohei Kitano, Ichiro Tanabe, Nobutaka Shioya, Takeshi Hasegawa, Tsuyoshi Murata, Yasushi Morita, Ryotaro Tsuji, Ken-ichi Fukui
Summary: Voltammetric and in situ infrared (IR) spectroelectrochemical studies were conducted to investigate the electrochemical dynamics of a stable trioxotriangulene (TOT) organic neutral pi- radical on a graphite electrode surface. The formation and dissolution of upright columnar crystals (face-on alignment) of TOT neutral radical were observed in a low concentration electrolyte, while more flat-lying columnar crystals (edge-on alignment) were formed in a higher concentration electrolyte. In situ IR attenuated total reflectance spectroscopy analyses characterized the crystal alignment and electrochemical behaviors of TOT neutral radicals, shedding light on the irreversible redox reaction of TOT on the graphite electrode.
Article
Chemistry, Physical
Yusuke Morino, Hikaru Sano, Koji Kawamoto, Ken-ichi Fukui, Masato Takeuchi, Atsushi Sakuda, Akitoshi Hayashi
Summary: Sulfide-based solid electrolytes are promising for solid-state lithium batteries due to their high ionic conductivities, suitable mechanical properties, and wide electrochemical windows. However, the hygroscopic nature of sulfide in these materials leads to the generation of toxic H2S gas upon reacting with water, which reduces the lithium-ion conductivity. On the other hand, it has been observed that conducting performance can be partially recovered through suitable heat treatment. This study employed multiple spectroscopic analyses to investigate the degradation and recovery mechanisms of a sulfide solid electrolyte under moisture exposure and vacuum heat treatment.
SOLID STATE IONICS
(2023)
Article
Nanoscience & Nanotechnology
Tomoharu Kimura, Takafumi Uemura, Yayoi Shibafuji, Takeshi Suyama, Hiroyuki Ueno, Tsuyoshi Sekitani
Summary: This study proposes a low-noise-electrode printing process for organic transistors to fabricate low-cost amplifiers for monitoring microvolt-level biosignals. By optimizing the process, the transistor noise is reduced by three orders, resulting in an organic pseudo-complementary metal-oxide-semiconductor amplifier with a noise level of 2.2 mu Vp-p.
ADVANCED ELECTRONIC MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Esther Karner-Petritz, Andreas Petritz, Takafumi Uemura, Naoko Namba, Teppei Araki, Tsuyoshi Sekitani, Barbara Stadlober
Summary: Flexible sensors are currently being intensively researched due to their ability to produce large-area, flexible devices that are cost-effective and environmentally friendly when fabricated on ultrathin substrates. Among the various applications, there is a particular focus on tactile and biosignal monitoring, which requires lightweight sensors that offer high wearing comfort. In this study, sensors are integrated in an active matrix configuration to achieve the desired spatiotemporal resolution of the signals.
ADVANCED ELECTRONIC MATERIALS
(2023)
Review
Chemistry, Multidisciplinary
Raymond A. A. Wong, Yasuyuki Yokota, Yousoo Kim
Summary: Electrochemistry plays a crucial role in addressing societal issues, and understanding the nature of electrode-electrolyte interfaces is a challenge due to the thick liquid electrolyte layer. However, combined ultrahigh vacuum-electrochemistry (UHV-EC) approaches provide a way to bridge electrochemistry with UHV-based techniques by removing the electrolyte layer for analysis.
ACCOUNTS OF CHEMICAL RESEARCH
(2023)
Article
Chemistry, Physical
Yuzu Kobayashi, Yasuyuki Yokota, Yasufumi Takahashi, Jun Takeya, Yousoo Kim
Summary: Direct measurements at the solid-liquid interface on the nanometer scale provide valuable information for fundamental and applied research. In this study, a novel method was developed to fabricate an electrochemical scanning tunneling microscopy (EC-STM) probe with high reproducibility. By electrochemically depositing Au on a pyrolytic carbon formed within a glass nanopipette, a sufficient insulation was achieved, overcoming the challenges in previous EC-STM studies. The high-quality EC-STM images obtained using this probe will pave the way for advanced measurements at various solid-liquid interfaces.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Dentistry, Oral Surgery & Medicine
Akio Fusayama, Tomoaki Mameno, Masahiro Wada, Kazuhiro Murakami, Toshikazu Nezu, Shinya Tokuono, Shusuke Yoshimoto, Takafumi Uemura, Tsuyoshi Sekitani, Kazunori Ikebe
Summary: The purpose of this study was to evaluate the reproducibility and reliability of a novel electromyogram (EMG) device with a flexible sheet sensor for measuring muscle activity related to mastication and swallowing. The results showed that the new EMG device had high reproducibility and reliability in measuring masseter muscle activity. Compared to conventional EMG devices, the new device showed high correlation in maximum amplitude, duration, integrated values, and signal-to-noise ratio (SNR). The new EMG device can be effectively used to evaluate muscle activity during mastication and swallowing.
JOURNAL OF PROSTHODONTIC RESEARCH
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Ryo Takamatsu, Shogo Amano, Shintaro Izumi, Hiroshi Ohta, Toshikazu Nezu, Yuki Noda, Teppei Araki, Takafumi Uemura, Tsuyoshi Sekitani, Hiroshi Kawaguchi
Summary: In recent years, the increase in heat stroke patients has become a social problem. This paper proposes a method to measure sweat rate using wearable devices in order to prevent heat stroke in indoor environments. The method uses textile-based electrodes to measure skin impedance, and a dual-frequency impedance measurement technique is introduced to address the issue of distinguishing the effects of water volume and salinity.
Article
Engineering, Electrical & Electronic
Koki Taguchi, Takafumi Uemura, Andreas Petritz, Naoko Namba, Mihoko Akiyama, Masahiro Sugiyama, Teppei Araki, Barbara Stadlober, Tsuyoshi Sekitani
Summary: Flexible electronics has opened up possibilities for the development of next-generation wearable and implantable healthcare devices. This study focuses on using a photoreactive insulating polymer to modulate the power consumption and operating speed of ultraflexible organic circuits. The results demonstrate that a nanoscale interfacial photochemical reaction can enable low power consumption and tunable operating speed in organic signal processing circuits.
ACS APPLIED ELECTRONIC MATERIALS
(2022)
Review
Chemistry, Multidisciplinary
Dan He, Yawen Li, Fuwen Zhao, Yuze Lin
Summary: High trap density in organic solar cells leads to localized charge carriers and reduced carrier lifetime, limiting device efficiency. This feature article summarizes the recent advances of trap suppression by material design and device engineering.
CHEMICAL COMMUNICATIONS
(2024)
Review
Chemistry, Multidisciplinary
Olivier Monfort, Arshitha Madhusudhan, Martin Motola
Summary: This article presents the advantages of coupling photocatalysis and Fenton-based processes for environmental remediation and discusses their synergy. It critically examines the simultaneous triggering of these two processes and provides insights into research approaches. The study aims to enhance understanding of this complex process and highlight the potential integration of new catalysts in current wastewater treatment technology.
CHEMICAL COMMUNICATIONS
(2024)
Article
Chemistry, Multidisciplinary
Manideepa Dhar, Chittaranjan Mishra, Avijit Das, Uttam Manna
Summary: An approach of 'polymerization of monomers in its aggregated form' has been introduced to tailor the water wettability of fibrous and porous substrates, achieving hydrophobicity to superhydrophobicity transition, as well as patterned wettability. This facile chemical method provides a durable coating with adjustable and patterned wettability for various potential applications.
CHEMICAL COMMUNICATIONS
(2024)
Article
Chemistry, Multidisciplinary
Saswat Ranjan Bhoi, Chhanda Debnath, Shikha Gandhi
Summary: In this article, a novel catalytic reaction using Pd(0) and Bronsted acid is reported for the synthesis of biologically important imidazolidinone-fused N-heterocycles through redox-neutral intramolecular N-allylation of indoles and pyrroles with alkynes. This atom-economical method is applicable to a wide range of substrates and eliminates the need for leaving groups or oxidizing agents commonly used in traditional allylation reactions.
CHEMICAL COMMUNICATIONS
(2024)
Article
Chemistry, Multidisciplinary
Longkun Chen, Mingshuai Zhang, Meichen Liu, Zhuoyuan Liu, Yuetong Qiu, Zhilai Zhang, Fuchao Yu, Jiuzhong Huang
Summary: In this study, an efficient Rh(III)-catalyzed selective mono- and dual-C-H bond functionalization/cyclization with iodonium ylide as the sole coupling partner was demonstrated. Fused benzodiazepine skeletons were obtained in excellent yields, providing an improved approach to dual C-H unsymmetrical functionalization.
CHEMICAL COMMUNICATIONS
(2024)
Article
Chemistry, Multidisciplinary
Alice Kennett, Sven Epple, Gabriella van der Valk, Irene Georgiou, Evelyne Gout, Romain R. Vives, Angela J. Russell
Summary: This study presents the design and synthesis of sulfated disaccharide inhibitors based on IdoA(2S)-GlcNS(6S), which showed potent inhibition of Sulf-2. The results suggest that IdoA(2S)-GlcNS(6S) is the shortest fragment size required for effective inhibition of Sulfs, and a trisulfated disaccharide is identified as the minimal fragment size of heparan sulfate for effective endosulfatase inhibition.
CHEMICAL COMMUNICATIONS
(2024)
Article
Chemistry, Multidisciplinary
Mauro Garbini, Andrea Brunetti, Riccardo Pedrazzani, Magda Monari, Massimo Marcaccio, Giulio Bertuzzi, Marco Bandini
Summary: The self-adaptability of galvanostatic electrolysis was found to be helpful in a multistage chemo- and diastereoselective electrochemically promoted cyclodimerization of chalcones. Through a series of reductive events, densely functionalized cyclopentanes with five contiguous stereocenters were obtained (25 examples, yields up to 95%, dr values up to >20:1). Further experimental and electrochemical investigations indicated the crucial role of dynamic kinetic resolution of the aldol intermediate in the reaction mechanism.
CHEMICAL COMMUNICATIONS
(2024)
Article
Chemistry, Multidisciplinary
Dhananjay S. Nipate, Neha Meena, Prakash N. Swami, Krishnan Rangan, Anil Kumar
Summary: In this study, the synthesis of functionalized benzo[a]phenazines and indazolo[2,3-a]quinolines was achieved through Rh(III)-catalyzed oxidative annulation of 2-arylquinoxalines and 2-aryl-2H-indazoles with allyl alcohols. The method showed a wide substrate scope, excellent functional group tolerance, good to high yields of annulated products, and the capability for scaled-up synthesis. A tentative mechanism of the annulation reaction was proposed based on a preliminary mechanistic investigation.
CHEMICAL COMMUNICATIONS
(2024)
Article
Chemistry, Multidisciplinary
Ruonan Zhang, Abudukadi Tudi, Xia Yang, Xuping Wang, Zhihua Yang, Shujuan Han, Shilie Pan
Summary: A new lead tellurium borate material with a unique fundamental building block [B4O10] was synthesized and found to exhibit high birefringence. The structure-property relationship was discussed using first-principles calculations.
CHEMICAL COMMUNICATIONS
(2024)
Article
Chemistry, Multidisciplinary
Amresh Kumar Singh, Baishali Thakurta, Anupam Giri, Monalisa Pal
Summary: This study introduces three key concepts for the quick synthesis of large-scale high-quality 2D materials films and their utilization in device fabrication.
CHEMICAL COMMUNICATIONS
(2024)
Article
Chemistry, Multidisciplinary
Reina Hagiwara, Shun Nishimura, Kosuke Okeyoshi
Summary: A copolymer-conjugated nanocatalytic system has been developed to improve electron transfer and enhance photoinduced H2 generation.
CHEMICAL COMMUNICATIONS
(2024)
