Article
Chemistry, Applied
Jaya Verma, Avi Gupta, Deepak Kumar
Summary: This research focused on developing a highly efficient and cost-effective multifunctional nanocoating by incorporating silica-titania core-shell particles into polyurethane for various applications. The core-shell structure combined the mechanical properties improvement of silica with the antimicrobial and hydrophobic enhancement of titania. Through testing and analysis, it was found that a concentration of 4% (wt) of nano core-shell particles in the PU coating system produced the best results for multipurpose applications.
PROGRESS IN ORGANIC COATINGS
(2022)
Article
Chemistry, Physical
Suwapee Samangsri, Thanita Areerob, Siriluk Chiarakorn
Summary: A nitrogen-doped TiO2@SiO2 core/shell nano-photocatalyst (N-TiO2@SiO2) was used in photocatalytic paint for the degradation of gaseous acetaldehyde under LED visible light irradiation. The N-TiO2@SiO2 structure was synthesized through solvothermal and sol-gel methods, as confirmed by XPS and TEM analysis. The N-TiO2@SiO2 photocatalytic paint exhibited significantly higher photodegradation efficiency (31%) compared to TiO2 paint (5%) and N-TiO2 paint (20%) within 16 hours. Additionally, it showed good chemical resistance and adhesion ability, meeting industry standards.
Article
Environmental Sciences
Sheida Mokhtari, Hossein Faghihian, Mehrosadat Mirmohammadi
Summary: In this study, a selective photocatalyst based on molecularly imprinted magnetized TiO2 (MMIP@TiO2) was prepared and used for the degradation of a sulfasalazine pharmaceutical pollutant. The MMIP@TiO2 photocatalyst showed significantly higher efficiency and selectivity compared to the non-imprinted counterpart, achieving 90% degradation efficiency within 10 minutes. The maximum removal efficiency was calculated to be 92%.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Polymer Science
Miyeon Kwon, Juhea Kim, Juran Kim
Summary: Hybrid cellulose acetate nanofibers containing TiO2 were prepared using emulsion electrospinning technique for denitrification and filtration. The nanofibers showed excellent photocatalytic and filtration efficiency, with increased surface hydrophobicity due to the morphology of micro-wrinkles and protrusions. This suggests that TiO2-CA nanofibers could be promising materials for highly efficient and sustainable air filters in industrial and home appliance systems.
Article
Chemistry, Applied
Yang Chen, Guobing Mao, Yawen Tang, Heng Wu, Gang Wang, Li Zhang, Qi Liu
Summary: The novel Cr2O3/C@TiO2 composite synthesized in this study showed enhanced visible light absorption, reduced recombination rate of electrons and holes, and abundant active sites for photoreduction reaction, leading to superior H-2 production compared to pure TiO2.
CHINESE JOURNAL OF CATALYSIS
(2021)
Article
Chemistry, Physical
Mahsa Khoshnam, Hamidreza Salimijazi
Summary: In this study, a novel magnetic-photocatalytic core/double-layer-shell of Fe3O4/SiO2/a-Fe2O3 particles was synthesized via a developed sol-gel method, with each stage characterized using XRD, FTIR, and VSM. The particles exhibited an average size of 250 nm and showed high photo-degradation efficiency towards dye contaminations in a short period of time.
SURFACES AND INTERFACES
(2021)
Article
Chemistry, Physical
Lokesh Saravanan, Ranjit A. Patil, Pangihutan Gultom, Brajesh Kumar, Arumugam Manikandan, Yen-Pei Fu, Yu-Lun Chueh, Chia-Liang Cheng, Wang-Chi Yeh, Yuan-Ron Ma
Summary: In this study, carbon-shelled titanium dioxide nanowires were successfully synthesized through chemical vapor deposition, with increased oxygen vacancies observed at higher growth temperatures, resulting in enhanced visible light absorption and improved photocatalytic degradation of methylene blue dye.
Article
Chemistry, Physical
Hongyuan Li, Bowen Zhang, Bo Zhang, Hari Bala, Xiangli An, Nian Sha, Zeyu Sun, Wei Zhang, Zhanying Zhang
Summary: All-inorganic perovskite materials with unique photoelectric properties have attracted attention in the field of photocatalysts. However, the poor stability of perovskite quantum dots hinders their practical applications. By coating CsPbBr3 quantum dots with Sn-TiO2, the stability of inorganic perovskite materials is improved. The resulting CsPbBr3/Sn-TiO2 nanocrystals show excellent dispersion and enhanced photocatalytic performance, making them suitable for environmental governance.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Barbara R. Gomes, Joana L. Lopes, Lorena Coelho, Mattia Ligonzo, Monica Rigoletto, Giuliana Magnacca, Francesca Deganello
Summary: SiO2@TiO2 core-shell nanoparticles were synthesized via a simple and low-cost method and exhibited enhanced adsorption and photodegradation properties for methylene blue under UV light. The nanoparticles showed superior performance compared to calcined SiO2@TiO2 and TiO2 samples. The synergy between the photocatalytic properties of TiO2 and the adsorptive properties of SiO2 contributed to the improved performance.
Article
Engineering, Chemical
Xiaohong Yang, Jinnan Liang, Haitao Fu, Xiaoli Ran, Xizhong An
Summary: In this study, Au loaded Ag@TiO2 ternary core-shell structures were synthesized, with Ag nanoparticles as cores in the inner layer and Au nanoparticles in the outer layer, leading to improved sunlight absorption and enhanced photocatalytic activity.
Article
Chemistry, Physical
Yi-Che Chen, Yu-Cheng Chang, Alexandre Gloter, Pei-Kai Hsu, Jenn-Ming Song, Shih-Yun Chen
Summary: The photocatalytic performance of new TiO2/CeO2 composites was enhanced compared to bare TiO2 and CeO2 nanoparticles. Tuning the TiO2 shell deposition extended the absorption range to visible light and prolonged the lifetime of photo-induced electron-hole pairs, resulting in a significant enhancement in the degradation rate of methylene blue under both UV and visible light conditions. The strong interface interaction and modification of Ce3+ and Ti3+ content near the interface in the core-shell structure contribute to the improved photocatalytic efficiency.
APPLIED SURFACE SCIENCE
(2021)
Article
Polymer Science
Shuyan Gao, Hang Zhao, Na Zhang, Jinbo Bai
Summary: The study focused on enhancing the electromechanical actuated properties of TiO2@SiO2/PDMS nanocomposites by fabricating core-shell TiO2@SiO2 nanoparticles. The addition of TiO2@SiO2 at a low electric field led to a significantly improved in-plane actuated strain, promising for designing novel composites with advanced low-field actuated electromechanical properties in next generation DE systems.
Article
Environmental Sciences
Nisha Rani, Brijnandan S. Dehiya
Summary: The study presents a smart magnetic nanocomposite doped with copper to reduce the energy bandgap of the photocatalyst, allowing for easy recovery after wastewater treatment and demonstrating high efficiency in degrading dyes.
ENVIRONMENTAL TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Zhihui Li, Junhe Hou, Xin Gu, Lu Gao, Ge Su, Fei Li
Summary: Two types of core-shell composite particles, m-SiO2@Cu and m-SiO2@TiO2@Cu, were synthesized by coating Cu nanoparticles on the surfaces of m-SiO2 and m-SiO2@TiO2 microspheres. The activity of m-SiO2@Cu primarily lies in the Cu nanoparticles, while the m-SiO2@TiO2@Cu also benefits from the presence of TiO2, forming a metal/semiconductor heterojunction.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Chemistry, Inorganic & Nuclear
Michaela Papageorgiou, Ioanna Kitsou, Paraskevi Gkomoza, Eleni Roussi, Eleni Lychna, Panagiota Angelopoulou, Vasiliki Papalouka, Athena Tsetsekou
Summary: In this paper, a novel photocatalyst consisting of a bio-mimetically formed silica core and silver based nanospheres attached to the substrate was prepared, characterized and tested. The photocatalytic activity of the catalyst was enhanced by the synergistic effect of silver, silver carbonate, and silver phosphate. The immobilization of the catalyst on silica substrates improved its photostability and prevented the formation of silver agglomerates. Various techniques were used to examine the structure of the catalyst and its photocatalytic properties were evaluated through a model reaction. The reusability of the catalyst was also demonstrated.
INORGANIC CHEMISTRY COMMUNICATIONS
(2022)
Article
Materials Science, Ceramics
Yitao Wang, Shuen Wei, Miss R. Cicconi, Yuta Tsuji, Masahiro Shimizu, Yasuhiko Shimotsuma, Kiyotaka Miura, Gang-Ding Peng, Daniel R. Neuville, Bertrand Poumellec, Matthieu Lancry
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2020)
Article
Nanoscience & Nanotechnology
Kai Tokuhiro, Makoto Okano, Satoru Hachinohe, Masahiro Shimizu, Yasuhiko Shimotsuma, Kiyotaka Miura
Article
Materials Science, Ceramics
Kento Nakashima, Masahiro Shimizu, Jun Matsuoka, Tsubasa Fukuyo, Hiroshi Kato, Masayuki Nishi, Yasuhiko Shimotsuma, Kiyotaka Miura
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2020)
Article
Chemistry, Physical
Masahiro Shimizu, Tsubasa Fukuyo, Jun Matsuoka, Kento Nakashima, Kenzo Sato, Tomohiro Kiyosawa, Masayuki Nishi, Yasuhiko Shimotsuma, Kiyotaka Miura
Summary: The Soret effect in silicate melts, particularly in the Na2O-SiO2 system, was investigated and validated in this study. The positive Soret coefficient of SiO2 in the SiO2-poor composition range was accurately predicted, contrary to previous experimental observations.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Physics, Applied
Torataro Kurita, Yasuhiko Shimotsuma, Masanori Fujiwara, Masahiro Fujie, Norikazu Mizuochi, Masahiro Shimizu, Kiyotaka Miura
Summary: High-density nitrogen-vacancy (NV) centers exceeding 10(16)/cm(3) inside a diamond can be achieved by femtosecond laser irradiation, which is crucial for a high-sensitive quantum sensor. The number of pulses and pulse energy can affect the NV concentration and damage generation, but electron spins of the substitutional nitrogen center (P1) are the dominant source for decoherence.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Physical
Masahiro Shimizu, Teppei Murota, Shingo Urata, Yoichi Takato, Yuya Hamada, Akio Koike, Yasuhiko Shimotsuma, Koji Fujita, Kiyotaka Miura
Summary: This study uses microsecond time-scale molecular dynamics simulations to investigate the origin of thermal shrinkage in soda-lime silicate glass below T-g. It is found that during annealing below T-g, Na ions penetrate the silicate rings, correcting their angles and ultimately leading to volume reduction in the glass. This cation displacement-induced dynamical structural relaxation evokes overall volume relaxation at low temperatures in glassy materials.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Materials Science, Ceramics
Yoshitaka Saijo, Yuichi Suzuki, Makiko Murata, Ryoji Akiyama, Masahiro Shimizu, Yasuhiko Shimotsuma, Kiyotaka Miura
Summary: This paper describes a new method for determining sulfide and sulfate in glass by decomposition and separation. The method was tested on two glass reference materials with commonly accepted testing equipment, and the results were in good agreement with the certified values.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2021)
Article
Materials Science, Ceramics
Yeming Zhang, Shunsuke Murai, Ayaka Maeno, Hironori Kaji, Masahiro Shimizu, Yasuhiko Shimotsuma, Zhijun Ma, Jianrong Qiu, Katsuhisa Tanaka
Summary: In this study, the application of TASB glasses in MO devices was investigated, revealing systematic variations in MO properties with B2O3 content and clarifying the effects of B2O3 on the local glass structures and Tb ion valence states. The TASB glass system showed promise for stable fiber-based Faraday effect devices due to its relatively high Verdet constant and suitable rheology.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Analytical
Yoshitaka Saijo, Makiko Murata, Takato Kajihara, Hiroyuki Hijiya, Yuichi Suzuki, Ryoji Akiyama, Masahiro Shimizu, Yasuhiko Shimotsuma, Kiyotaka Miura
Summary: This study proposes a chemical analysis method for determining the concentrations of Sn2+ and Sn4+ in glass containing iron oxide. By using ascorbic acid to reduce Fe3+ and subsequently separating Sn2+ as a diethyldithiocarbamate complex, the concentrations of Sn2+ can be calculated through inductively coupled plasma atomic emission spectroscopy. The results are validated by comparing with Mossbauer spectroscopy, demonstrating the effectiveness of the proposed approach.
ANALYTICAL SCIENCES
(2022)
Article
Chemistry, Physical
Masahiro Shimizu, Kenzo Sato, Kento Nakashima, Tomohiro Kiyosawa, Jun Matsuoka, Yasuhiko Shimotsuma, Kiyotaka Miura
Summary: By using a laser-induced local heating experiment and temperature analysis, the composition-dependent sign inversion of the Soret coefficient of SiO2 in binary silicate melts was observed, and the dominant factors determining the migration direction of SiO2 were identified, which is significant for understanding the Soret effect in oxide melts.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Seisuke Nakashima, Yukio Kimura, Ryusuke Yoshibayashi, Yasuhiko Shimotsuma, Kiyotaka Miura
Summary: The magnetization of ZnFe2O4 nanoparticles dispersed in silica was successfully enhanced at room temperature by irradiation with a femtosecond laser. The increase in magnetization can be explained by the formation of a metastable phase with high magnetization. The enhancement of magnetization was observed due to the instant formation of a random cation distribution in the spinel structure upon local temperature rise.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Chemistry, Physical
Tomohiro Kiyosawa, Masahiro Shimizu, Jun Matsuoka, Kento Nakashima, Kenzo Sato, Masayuki Nishi, Yasuhiko Shimotsuma, Kiyotaka Miura
Summary: This study demonstrates that the modified Kempers model can accurately predict the composition dependence of the Soret coefficient in molecular liquids with negative enthalpies of mixing. It provides a framework for predicting and understanding the Soret effect based on equilibrium thermodynamic properties.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Materials Science, Ceramics
Yoshitaka Saijo, Yuichi Suzuki, Ryoji Akiyama, Masahiro Shimizu, Yasuhiko Shimotsuma, Kiyotaka Miura
Summary: This paper presents a novel wet chemical analysis method for quantitatively determining the concentrations of tin that penetrates the surface of float glass. The method offers fine depth resolution and can provide detailed information about the tin penetration, making it a valuable contribution to the production of high-quality glass.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2022)
Article
Optics
Y. Shimotsuma, K. Kinouchi, R. Yanoshita, M. Fujiwara, N. Mizuochi, M. Uemoto, M. Shimizu, K. Miura
Summary: The NV centers in a diamond were successfully created using a femtosecond laser single pulse. The effect of different laser pulse widths on the diamond lattice was investigated both experimentally and theoretically. Interestingly, despite the high thermal conductivity of a diamond, a suitable pulse repetition rate of several tens kHz was found for the formation of NV center ensembles by femtosecond laser pulse irradiation.
Article
Nanoscience & Nanotechnology
Yuya Hamada, Teppei Murota, Masahiro Shimizu, Yasuhiko Shimotsuma, Kiyotaka Miura
Summary: Structural relaxation is a widely studied phenomenon in glassy systems, but its origin from a glass structural viewpoint is not clearly defined. In this study, volume relaxation, Raman spectroscopy, and surface resistivity measurements were performed on soda-lime silicate glasses before and after annealing, revealing reorganization of the SiO2 network, transfer of Na ions, and segmentation of the ion channel region during structural relaxation.
