Article
Materials Science, Multidisciplinary
Amir Hassan Zahiri, Luiz Carneiro, Jamie Ombogo, Pranay Chakraborty, Lei Cao
Summary: The study investigates the structure and formation mechanism of {11 (2) over bar2} twin-twin boundaries in Mg, revealing alignment with {11 (2) over bar2} or {11 (2) over bar6} planes. These boundaries significantly contribute to the understanding of twinning theories in Mg.
COMPUTATIONAL MATERIALS SCIENCE
(2022)
Article
Nanoscience & Nanotechnology
Denise J. Erb, Jan Perlich, Stephan Roth, Ralf Roehlsberger, Kai Schlage
Summary: In this study, the spontaneous crystal surface reconstruction of M-plane alpha-Al2O3 is observed in great detail through in situ real-time grazing incidence small-angle X-ray scattering experiments (GISAXS) combined with model-based analysis and ex situ atomic force microscopy (AFM). By elucidating the time dependence of the morphological parameters, this research provides a powerful way to significantly improve the predictability of annealing outcome and customize nanopatterned alpha-Al2O3 templates for improved nanofabrication routines.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Materials Science, Multidisciplinary
Ming-Wei Lai, Hiroki Kurata
Summary: The study reveals the microstructural characteristics of alpha-Fe2O3 nanowhiskers synthesized via oxidation of iron-based substrates, confirming their association with oxygen vacancy ordering.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Engineering, Chemical
Vipada Dokmai, Kitiphat Sinthiptharakoon, Witchukorn Phuthong, Varong Pavarajarn
Summary: This study used atomic force microscopy force spectroscopy to investigate the interactions between talc particles and matrix materials. The results showed that hydrophilic talc particles obtained from different treatments exhibited better adhesion with the materials, but the anisotropy of talc surfaces persisted. Surface hydrophobization reduced talc's surface anisotropy but also decreased adhesion. The findings suggest that adhesion between talc and materials is influenced by van der Waals interactions and surface polarity, providing insights for modulating talc's adhesion, hydrophobicity, and surface uniformity.
Article
Chemistry, Physical
Jing Chang, Bo Liu, James S. Grundy, Huaizhi Shao, Rogerio Manica, Zhen Li, Qingxia Liu, Zhenghe Xu
Summary: In this study, atomic force microscopy was used to image the surface lattice structure of kaolinite basal planes in liquids, revealing distinct ion adsorption characteristics in the presence and absence of monovalent and divalent cations through different mechanisms.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Physics, Fluids & Plasmas
R. Mark Bradley, Patrick D. Shipman
Summary: In this study, the patterns created by scanning an atomic force microscope tip over a polymer surface were investigated using a mesoscopic model. The research discovered that the steady-state solution is only stable below a critical value, beyond which periodic stick-slip motion occurs.
Article
Chemistry, Physical
Tyler J. Myers, James A. Throckmorton, Rebecca A. Borrelli, Malcolm O'Sullivan, Tukaram Hatwar, Steven M. George
Summary: Al2O3 atomic layer deposition (ALD) was used to smooth the roughness on silicon wafers prior to chemical mechanical polishing (CMP). The efficiency of the smoothing decreased when the lateral distance between the surface asperities was much larger than the Al2O3 ALD film thickness. Reflectivity studies of silver films deposited on the silicon wafers also demonstrated that Al2O3 ALD smoothing improved the optical performance of reflective mirrors.
APPLIED SURFACE SCIENCE
(2021)
Article
Nanoscience & Nanotechnology
Y. Yue, Y. Zhang, J. F. Nie
Summary: The stability of single-atomic-layer-height disconnections in magnesium varies depending on the type of I-1 stacking fault associated with a stacking sequence change. In some cases, a prismatic-basal (PB) disconnection is more stable, while in other cases a basal-prismatic (BP) disconnection is more stable. The stability can also change when there is a shift in the lying plane of the connected I-1 fault.
SCRIPTA MATERIALIA
(2022)
Article
Metallurgy & Metallurgical Engineering
Shao Xiaohong, Peng Zhenzhen, Jin Qianqian, Ma Xiuliang
Summary: The impact of long-period stacking ordered (LPSO) structure/solute-rich element laminar stacking faults (SFs) on the intersection of co-zone {10 (1) over bar2} twin variants was examined at the atomic scale using TEM. The study revealed that a basal-prismatic (BP) boundary was commonly formed at the intersection of LPSO/SFs and twins, causing the twin boundaries (TBs) to bend into a bow shape between adjacent LPSO/SFs. The co-zone {10 (1) over bar2} twin variants and LPSO/SFs intersected with each other, introducing a basalbasal (BB) boundary and prismatic-prismatic (PP) boundaries, which were associated with a triangular matrix near the LPSO/SFs.
ACTA METALLURGICA SINICA
(2023)
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
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
Bin Chen, Xin Yang, Yinan Xu, Siyuan Hu, Xiaoli Zeng, Yiping Liu, Kok Bing Tan, Jiale Huang, Guowu Zhan
Summary: Researchers designed a sandwich-structured nanocatalyst for highly selective hydrogenation of unsaturated aldehydes to unsaturated alcohols. The nanocatalyst consisted of accessible platinum nanoparticles sandwiched between MOF layers. The results showed that the sandwich structure enhanced both selectivity and catalytic activity compared to conventional Pt catalysts.
Article
Materials Science, Multidisciplinary
Tao Luo, Yi Peng, Yanhua Guo, Juexian Cao
Summary: This study investigates the embrittlement effects induced by additional hydrogen in titanium and titanium alloys in detail, demonstrating that hydrogen is more attractive to sites located at the twin boundary than in the bulk, reducing the intergranular strength of a Ti grain boundary. The weakening effect of hydrogen is attributed to the breaking of the interfacial Ti-Ti bonds, decreasing twin boundary adhesion and resistance to cracking.
MATERIALS TODAY COMMUNICATIONS
(2021)
Review
Chemistry, Physical
Jinbo Peng, Jing Guo, Runze Ma, Ying Jiang
Summary: Water-solid interfaces are crucial in various scientific and application fields. Atomic force microscopy (AFM) has greatly enhanced our understanding of water-solid interfaces at the molecular scale. This review focuses on recent advances in probing water-solid interfaces using noncontact AFM, particularly highlighting the imaging of interfacial water with ultrahigh spatial resolution. Furthermore, the development of qPlus-based AFM with functionalized tips enables direct imaging of the H-bonding skeleton of interfacial water in ultrahigh vacuum (UHV) environments. The use of three-dimensional (3D) AFM with low-noise cantilever deflection sensors allows atomic resolution imaging at liquid/solid interfaces, providing the possibility to investigate hydration layer structures under realistic conditions.
SURFACE SCIENCE REPORTS
(2022)
Article
Chemistry, Physical
Pamela Nair Silva-Holguin, Alvaro de Jesus Ruiz-Baltazar, Nahum Andres Medellin-Castillo, Gladis Judith Labrada-Delgado, Simon Yobanny Reyes-Lopez
Summary: This study successfully synthesized alpha-Al2O3/Ba-beta-Al2O3 spheres with certain chemical inertness and high adsorption capacity through structural and surface modifications with the addition of additives or metallic salts. The spheres showed a significant adsorbent capacity for Cd(II) and exhibited acid character with a negative surface charge. These findings contribute to the development of adsorbent materials for Cd(II) removal.
Article
Chemistry, Physical
Tomoya Fujiwara, Akira Sasahara, Naohisa Happo, Koji Kimrua, Kouichi Hayashi, Hiroshi Onishi
CHEMISTRY OF MATERIALS
(2020)
Article
Chemistry, Physical
Shengkai Xue, Akira Sasahara, Hiroshi Onishi
JOURNAL OF CHEMICAL PHYSICS
(2020)
Article
Chemistry, Multidisciplinary
Yuya Teduka, Akira Sasahara, Hiroshi Onishi
Article
Nanoscience & Nanotechnology
Joshua J. Walton, Takumi Hiasa, Hideyuki Kumita, Kazumasa Takeshi, Graham Sandford
ACS APPLIED MATERIALS & INTERFACES
(2020)
Article
Chemistry, Physical
Hanggara Sudrajat, Mitsunori Kitta, Ryota Ito, Sota Nagai, Tomoko Yoshida, Ryuzi Katoh, Bunsho Ohtani, Nobuyuki Ichikuni, Hiroshi Onishi
JOURNAL OF PHYSICAL CHEMISTRY C
(2020)
Article
Chemistry, Physical
Rio Konno, Shingo Maruyama, Takumu Kosaka, Ryuzi Katoh, Ryota Takahashi, Hiroshi Kumigashira, Nobuyuki Ichikuni, Hiroshi Onishi, Yuji Matsumoto
Summary: In this study, Sr-doped NaTaO3 (NTO) single-crystalline films with different Sr compositions were successfully fabricated, showing changes in lattice constants and optical absorption edge energies as the Sr doping level increased. The doped Sr atoms were found to substitute for both A and B sites in the crystal structure. Furthermore, compositionally graded Sr-doped NTO films were successfully prepared with different Sr composition gradients, and the lifetime of photoexcited carriers in these films was longer compared to NTO and homogeneous Sr-doped NTO films.
CHEMISTRY OF MATERIALS
(2021)
Article
Physics, Applied
Mitsunori Kitta, Noboru Taguchi, Hanggara Sudrajat, Hiroshi Onishi
Summary: Direct atomic-scale imaging and real-space elemental mapping revealed the dopant site in In-STO crystals, providing direct evidence of In-Ti substitution in In-STO photocatalysts.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Physical
Kota Hashimoto, Ken-ichi Amano, Naoya Nishi, Hiroshi Onishi, Tetsuo Sakka
Summary: The study used atomic force microscopy to investigate the interactions between solvents and solid surfaces, evaluating the effects of probes and parameters on the experimental results through force curve calculations. The solvophilicity of the probe had a greater impact on the force curves compared to the substrate solvophilicity, with the number density distribution used for evaluation. The derivative of the force curve with respect to surface separation reflected the density distribution better than the force curve itself, and solvophobic probes were found to be more effective in reflecting the distribution.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Chemistry, Physical
Hanggara Sudrajat, Mitsunori Kitta, Ryuzi Katoh, Nobuyuki Ichikuni, Hiroshi Onishi
Summary: This study investigates the behavior of photoexcited electrons in intentionally distorted Ba-doped NaTaO3 photocatalysts, revealing that moderate distortion is favorable for generating shallow electron traps, resulting in longer electron lifetime and larger electron population.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Physical
Zhebin Fu, Takuya Hirai, Hiroshi Onishi
Summary: This study characterized electronic absorption under water by attenuated total reflection of infrared light excited by long-life charge carriers, demonstrating the contribution of long-life electrons to surface redox reactions over semiconductor photocatalysts for artificial photosynthesis.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Physical
Zhebin Fu, Hiroshi Onishi
Summary: Chemical conversion of materials is efficiently achieved by assembling atoms using semiconductor photocatalysts, with bandgap-excited electrons and holes playing a crucial role. This study characterized and quantified the electronic absorption of TiO2 photocatalysts excited in liquid using attenuated total reflection of infrared and near-infrared light. The absorption spectra of electron polarons in TiO2 particles were analyzed and compared with other photocatalysts, providing insights into electron-hole recombination kinetics. The average lifetime of electron polarons in TiO-6 under solar-light irradiation conditions was estimated to be 1 ms.
JOURNAL OF PHYSICAL CHEMISTRY B
(2023)
Article
Chemistry, Physical
Akira Sasahara, Koji Kimura, Hanggara Sudrajat, Naohisa Happo, Kouichi Hayashi, Hiroshi Onishi
Summary: This study investigates the doping effects of Sr and La on potassium tantalate (KTaO3) photocatalysts using X-ray diffraction and fluorescence holography. It is found that Sr doping forms a solid solution of KTaO3-Sr(Sr1/3Ta2/3)O3, while La doping leads to the presence of two La-containing phases and a complex La doping mechanism. X-ray photoelectron spectroscopy reveals the enrichment of dopants on the wafer surface, and atomic force microscopy shows changes in nanoscale topography.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
Takumu Kosaka, Tomohiro Ando, Takashi Hisatomi, Hiroshi Nishiyama, Yuanshu Zhou, Kazunari Domen, Yasufumi Takahashi, Hiroshi Onishi
Summary: This study investigated the kinetics of O-2 evolution after the multi-step, four-electron oxidation of water on Al-doped SrTiO3 particles loaded with RhCrOx and CoOy cocatalysts using transient amperometry. The results unexpectedly showed instantaneous O-2 adsorption and desorption in addition to steady, photocatalytic O-2 evolution on the photocatalyst modified under intense light irradiation. The proposed mechanism for O-2 adsorption and desorption was compared with the photoinduced O-2 desorption on anion vacancies of TiO2(110).
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Chemistry, Physical
Hanggara Sudrajat, Mitsunori Kitta, Ryota Ito, Tomoko Yoshida, Ryuzi Katoh, Bunsho Ohtani, Nobuyuki Ichikuni, Hiroshi Onishi
Summary: NaTaO3, a semiconductor with a perovskite structure, is a highly active photocatalyst for overall water splitting when doped appropriately with La cations. The La-rich layer in the surface characteristic of La-doped NaTaO3 plays an important role in electron-hole recombination, electron mobility, and water splitting activity. This study reveals the relationship between the nanoarchitecture and photoactivity of core-shell-structured La-doped NaTaO3, allowing for tuning of surface features to enhance water splitting activity.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Chemistry, Physical
Takumu Kosaka, Yuya Teduka, Takuya Ogura, Yuanshu Zhou, Takashi Hisatomi, Hiroshi Nishiyama, Kazunari Domen, Yasufumi Takahashi, Hiroshi Onishi
