Article
Chemistry, Inorganic & Nuclear
Nikhita Khurana, Pinklesh Arora, Avinash S. Pente, Keyur C. Pancholi, Virendra Kumar, Chetan P. Kaushik, Sunita Rattan
Summary: This article investigates the effect of different concentrations of vinyl triethoxysilane (VTES) on the surface modification of zinc oxide nanoparticles. Characterization techniques such as FTIR, TGA, SEM, EDX, XRD and contact angle confirm that a 15 wt% concentration of VTES is suitable for the surface modification of ZnO nanoparticles.
INORGANIC CHEMISTRY COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Tae Yun Ko, Daesin Kim, Seon Joon Kim, Hyerim Kim, Arun S. Nissimagoudar, Seung-Cheol Lee, Xiaobo Lin, Peter T. Cummings, Sehyun Doo, Seongmin Park, Tufail Hassan, Taegon Oh, Ari Chae, Jihoon Lee, Yury Gogotsi, Insik In, Chong Min Koo
Summary: The article introduces a novel ligand chemistry for MXenes using alkylated 3,4-dihydroxy-L-phenylalanine (ADOPA), which can functionalize MXene surfaces under mild reaction conditions. The ADOPA ligands form strong hydrogen-bonding and pi-electron interactions with the surface terminal groups of MXenes, while the hydrophobic fluorinated alkyl tail is compatible with organic solvents. This method produces stable colloidal solutions and liquid crystals of various MXenes in organic solvents, with excellent electrical conductivity, improved oxidation stability, and processability, enabling applications in flexible electrodes and electromagnetic interference shielding.
Article
Chemistry, Multidisciplinary
Yongjun Lim, Seung-hyun Noh, Tae-Hyun Shin, Jung-uk Lee, Dominik Lungerich, Jae-Hyun Lee, Jinwoo Cheon
Summary: A single nanoparticle coating method is reported to form 1 nm polymeric shells with various chemical functional groups and surface charges. Nanosecond thermal energy pulses triggered polymerization in the region only a few nanometers from the surface of magnetic nanoparticles under exposure to alternating magnetic field. Modular coatings with different functional groups and surface charges can be achieved by selecting appropriate monomers.
Article
Biophysics
Lumin Yang, Xiaoduo Zhao, Jing Zhang, Shuanhong Ma, Lei Jiang, Qiangbing Wei, Meirong Cai, Feng Zhou
Summary: In this study, a novel biomimetic nanoparticles lubricant, CS-PS, was synthesized and demonstrated to have excellent lubrication performance and drug carrier properties, making it a promising option for the treatment of osteoarthritis.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2021)
Article
Engineering, Chemical
Yapeng Shi, Shanshan Wu, Zhenggong Wang, Xiangyu Bi, Menghui Huang, Yatao Zhang, Jian Jin
Summary: Metal organic frameworks (MOFs) are ideal fillers for preparing mixed matrix membranes (MMMs) due to their molecular sieving property. Highly dispersed ZIF-8 nanoparticles with diameter of around 50 nm were prepared by coating isophthalic dihydrazide (IPD) molecular layer onto their surfaces. The modification of IPD greatly enhances the interfacial affinity between ZIF-8 and 6FDA-Durene polyimide (PI) in MMMs, resulting in improved gas permeation performance.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Biophysics
J. B. M. Rocha Neto, F. Copes, P. Chevallier, R. S. Vieira, J. V. L. da Silva, D. Mantovani, M. M. Beppu
Summary: The development of hyaluronan/chitosan films functionalized with sulfated chitosan provides a new insight for the design of novel antithrombogenic biomaterials. The sulfated groups in the films effectively limit platelet adhesion and offer anti-thrombogenic properties.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2022)
Review
Polymer Science
Caiyun Yang, Hao Wu, Mengyu Cai, Yuting Zhou, Chunyu Guo, Ying Han, Lu Zhang
Summary: Polymers from biomass waste can be converted to functional biochar materials via pyrolysis for various applications. The biochar derived from biological polymeric substances shows potential as an alternative electrode material for high-performance supercapacitors. This review discusses the mechanisms and technologies for char formation from biomass waste and introduces energy storage mechanisms of supercapacitors, providing insights into the use of biological polymer-based char material for electrochemical energy storage. It also summarizes recent progress in biochar modification approaches to enhance the capacitance of biochar-derived supercapacitors.
Article
Chemistry, Multidisciplinary
Tianyu Kong, Rui Wang, Ding Zheng, Junsheng Yu
Summary: Introducing the perylene diimide derivative PDINO successfully eliminated defects between the tin oxide nanoparticles electron transporting layer and the active layer, significantly improving the power conversion efficiency of organic solar cells.
FRONTIERS IN CHEMISTRY
(2021)
Article
Chemistry, Physical
Romel Hidayat, Hye-Lee Kim, Khabib Khumaini, Tanzia Chowdhury, Tirta Rona Mayangsari, Byungchul Cho, Sangjoon Park, Won-Jun Lee
Summary: Selective etching of silicon oxide (SiO2) against silicon (Si) using anhydrous hydrogen fluoride (HF) vapor has been studied. The density functional theory (DFT) calculation shows that SiO2 can be etched by HF at near-room temperature due to the relatively low activation energies of the fluorination steps. In contrast, the fluorinations of Si have higher activation energies, indicating negligible etching of silicon by HF in the near-room temperature process. The calculation results explain well the experimental observation of the selective etching of SiO2 against Si by HF vapor.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Thi Mien Trung Huynh, Kazukuni Tahara, Steven De Feyter, Thanh Hai Phan
Summary: Multilayered growth is commonly seen when aryl diazonium derivatives are electrografted onto graphitic substrates. The mechanism of this growth has been studied through various methods, including measuring layer thickness, charge transfer, and simulations. However, spectroscopy and microscopy approaches have been underrepresented. This study presents a comparative characterization of multilayer growth using cyclic voltammetry, atomic force microscopy, and scanning tunneling microscopy, showing the influence of functional groups on the growth mechanism.
Article
Chemistry, Multidisciplinary
Eimear Magee, Fengzai Tang, Marc Walker, Alla Zak, Reshef Tenne, Tony McNally
Summary: Functionalisation of nanofillers is necessary for strong interfacial interactions with polymers and the preparation of high-performance (nano)composites. Tungsten disulphide nanotubes (WS2 NTs) were functionalized using (3-aminopropyl) triethoxysilane (APTES) for composites with poly(lactic acid) (PLA). The successful APTES modification of WS2 NTs was verified through various analyses, including XPS, STEM-EDS, FTIR, and Raman spectroscopy. The APTES modified WS2 NTs demonstrated improved thermal stability, organophilicity, and strong interfacial interactions with the PLA matrix, leading to a significant enhancement in both the elongation at break and tensile toughness of the composites.
Article
Biochemistry & Molecular Biology
Mizuki Kobayashi, Fumihiro Nishimura, Jae-Ho Kim, Susumu Yonezawa
Summary: In this study, the surface of PTFE was modified through a combination of gold sputtering and surface fluorination to improve dyeability. The modified PTFE substrates showed increased surface roughness and negatively charged surface, which resulted in enhanced dye staining intensity. These modified PTFE substrates may find wide applications in dyeing, hydrophilic membrane filters, and other adsorption needs.
Article
Materials Science, Multidisciplinary
Junren Xiang, Jing Zhang, Jiawei Li, Huachen Shao, Licheng Wang, Xiao Liu, Bin Shan, Rong Chen
Summary: In this study, a few-nanometres-thick inorganic film coating layer was prepared using atomic layer deposition (ALD) method to improve the dispersion stability of permanent violet pigments. The results showed that this surface modification method can enhance the dispersion of the pigments and promote their applications in the electronic colouration industry.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Takehiro Yachi, Masaki Matsubara, Chen Shen, Shunya Asami, Nathalie B. Milbrandt, Minseon Ju, Sameera Wickramasinghe, Anna Cristina S. Samia, Atsushi Muramatsu, Kiyoshi Kanie
Summary: Introduction of carboxyl group enabled excellent water dispersibility and stability of monodisperse Fe3O4 nanoparticles, making them suitable for applications such as water-based ferrofluid and hyperthermia treatment. The COOH-modified Fe3O4 NPs exhibited typical ferrofluid behavior and high dispersion stability in water for over 6 months. Magnetic induction heating performance evaluation yielded a specific absorption rate (SAR) value of 38.3 W/g Fe, indicating the potential advantages of the developed nanoparticles for precise surface design and therapeutic applications.
ACS APPLIED NANO MATERIALS
(2021)
Article
Energy & Fuels
Yuan Geng, Jinsheng Sun, Jianhua Wang, Ren Wang, Jie Yang, Qibing Wang, Xiaoxiao Ni
Summary: The study introduces a surface-modified nanoscale polystyrene (NS) as a plugging agent for oil-based drilling fluids, which effectively reduces the surface free energy of NS for enhanced dispersion stability in mineral oil. NS can improve the contact angle of mineral oil on the rock surface, reduce oil imbibition, and maintain rock mechanical stability. Additionally, NS demonstrates thermal resistance, nanoscale dispersion in mineral oil, and significant reduction in permeability plugging apparatus filtration loss and mechanical stability decrease of the rock.
Article
Materials Science, Ceramics
Takuma Takahashi, Fumika Sakamoto, Junichi Tatami, Motoyuki Iijima
Summary: In situ observation of the internal structure evolution during sintering of Al2O3 green bodies using swept-source optical coherence tomography revealed changes in the density distribution and growth of coarser pores. This technique allows real-time monitoring of sintering behavior, providing insights into the development of ceramics with superior properties.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2022)
Article
Chemistry, Physical
Motoyuki Iijima, Naoya Taki, Junichi Tatami
Summary: This study hypothesized that the real particle dynamics during shearing could be effectively revealed by combining macroscopic flow curve measurements, OCT observation, and AFM measurement. Experimental results showed that suspensions may exhibit different microscopic flow modes during flow curve measurements depending on the complexation of fatty acids to PEI.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Materials Science, Ceramics
Tsukaho Yahagi, Daisuke Kawai, Takuma Takahashi, Motoyuki Iijima, Junichi Tatami
Summary: This study investigated the electrical resistivity of Si3N4 ceramics with Yb2O3 additive by applying various voltages at different temperatures. The addition of Yb2O3 led to a lower resistivity in the Si3N4 ceramics, which decreased with increasing temperature and applied voltage. Hopping conduction through the J-phase was found to be the main reason for the decrease in resistivity.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Nanoscience & Nanotechnology
Ryota Sato, Tsukaho Yahagi, Junichi Tatami, Motoyuki Iijima
Summary: A new method for rapid manufacturing of transparent SiO2 glass components using a hybridized 3D structuring approach has been reported. The method involves photo-curing, green machining, fast debinding/sintering process, and the use of interparticle photo-cross-linkable suspensions. The study demonstrates that this method can produce highly transparent SiO2 glass components with improved mechanical properties and green machinability.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Engineering, Chemical
Motoyuki Iijima, Ryoya Arita, Yoko Fujishiro, Taichi Furukawa, Shoji Maruo, Junichi Tatami
Summary: The relationships between the processing methods of photocurable SiO2 suspensions, powder dispersion states, material processability, and the structural changes of photocured SiO2 bodies during their sintering into transparent glass components were investigated. The effects of the differences in the particle dispersion states on the real-time multi-scaled structural changes of photocured bodies during sintering were elucidated. The in-line transparency of the sintered SiO2 material was consistent with those of the microstructures observed using OCT.
ADVANCED POWDER TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
Kohei Aminaka, Junichi Tatami, Motoyuki Iijima, Takuma Takahashi, Tsukaho Yahagi
Summary: In this study, high-transparency α-SiAlON ceramics were fabricated by adding various rare-earth oxides, and their effects on transparency and fluorescence were investigated. The use of Ho2O3 as an additive resulted in the lowest light scattering and highest in-line transmittance. These transparent α-SiAlON ceramics also exhibited fluorescence corresponding to different rare-earth ions.
CERAMICS INTERNATIONAL
(2022)
Article
Engineering, Chemical
Yoshihiko Yamanoi, Junichi Tatami, Motoyuki Iijima
Summary: A new series of Pickering emulsions that can be photo-cured by interparticle photo-cross-linking reactions using small amounts of multifunctional acrylate (MA) monomers is proposed to rapidly manufacture complex-structured porous ceramic materials.
ADVANCED POWDER TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
Yuki Otsuka, Isao Yamamoto, Motoyuki Iijima, Junichi Tatami
Summary: This study investigated the sintering behavior of green bodies molded under a strong magnetic field using the master sintering curve (MSC) theory. The results showed that the green bodies molded with a magnetic field had higher apparent activation energy during sintering and more consistent grain orientation compared to those without a magnetic field.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Kohei Aminaka, Junichi Tatami, Motoyuki Iijima, Takuma Takahashi
Summary: In this study, transparent alpha-SiAlON:Ce3+ ceramics were successfully fabricated using gas-pressure sintering technique, with Lu-alpha-SiAlON:Ce3+ ceramics displaying higher transparency and blue shift in maximum emission wavelength compared to Y-alpha-SiAlON:Ce3+ ceramics. Lower Ce concentration resulted in increased transparency and blue shift in maximum emission wavelength.
ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Taiki Maruyama, Masaru Mukai, Ryota Sato, Motoyuki Iijima, Mitsuki Sato, Taichi Furukawa, Shoji Maruo
Summary: This study demonstrates the production of heterogeneous 3D-printed objects with different mechanical and optical properties by controlling the microphase-separated structures through copolymerization and varying scanning speeds in a laboratory-constructed laser-scanning micro-stereolithography system. The ability to control the physical properties of 3D-printed parts has potential for functionalizing microdevices.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Materials Science, Ceramics
Yuki Otsuka, Isao Yamamoto, Motoyuki Iijima, Junichi Tatami
Summary: Wet-jet milling of a slurry can achieve highly oriented hydroxyapatite ceramics with anisotropy in fracture toughness.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
Mariko Minami, Junichi Tatami, Motoyuki Iijima, Takuma Takahashi, Tatsuki Ohji
Summary: This study investigated the behavior of crack formation during the dewaxing process using two types of Al2O3 green bodies added with different organic binders. It was found that the type of the binder significantly affected the crack initiation and deformation behaviors of the green bodies.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Mami Tanabe, Junichi Tatami, Motoyuki Iijima, Tsukaho Yahagi, Takuma Takahashi, Hiromi Nakano, Tatsuki Ohji
Summary: The yield stress and fracture strength of beta-Si3N4 single crystals were measured by bending tests of microcantilever beam specimens. The yield stress depended on the crystal orientation, and the plastic deformation resulted from dislocations in the primary slip system {101 over bar 0}$\{ 10\bar{1}0\} $. The fracture strength ranged approximately up to 20 GPa, depending on the crystal orientation, and the fracture behavior was discussed in terms of the accumulation of dislocations.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Engineering, Chemical
Fumiya Ito, Takuya Honda, Haruka Komuro, Fumitaka Yoshikawa, Junichi Tatami, Motoyuki Iijima
Summary: The flowing behavior of concentrated aqueous TiO2 suspensions was analyzed by studying the structure of polymeric dispersants, their adlayer thickness on particle surface, and particle concentrations. The results showed hysteresis characteristics of the suspension flow curves when the steric repulsive force of the polymer dispersant dominated the van der Waals attractive forces. The particle concentration dependency of the suspension viscosities followed a unified trend when the concept of relative surface distance was introduced.
Article
Materials Science, Ceramics
Hiromasa Kuroda, Junichi Tatami, Motoyuki Iijima, Takuma Takahashi
Summary: In the wet forming of ceramics, it is important to control the cracking and deformation of the ceramic slurry during drying. This study developed a combined system of OCT and TG for real-time observation of the internal structural changes in a drying SiO2 slurry. The observations revealed significant changes in OCT signal intensity due to the Brownian motion of SiO2 particles in the early stages of drying. The slurry exhibited shrinkage, loss of fluidity, and agglomeration of ceramic particles, leading to crack formation in localized dry regions.
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN
(2023)