Article
Chemistry, Inorganic & Nuclear
Lu-Fei Song, Tao Huang, Zi-An Wang, Lin-Jun Zhu, Teng Zhang
Summary: Two isostructural calcium-phosphonate monoester layered coordination polymers grafted with methoxyethyl (Ca-L1) and ethyl (Ca-L2) groups were synthesized using a solvothermal method. Both materials can be exfoliated into metal-organic layers (MOLs) with structure retention via a top-down approach. The introduction of phosphonate monoester (PME) grafting groups plays a crucial role in regulating the hydrophilicity-hydrophobicity and water stability of the materials.
INORGANIC CHEMISTRY COMMUNICATIONS
(2021)
Article
Polymer Science
Nikolay A. A. Belov, Aleksandr Yu. Alentiev, Dmitrii S. S. Pashkevich, Fedor A. A. Voroshilov, Edgar S. S. Dvilis, Roman Yu. Nikiforov, Sergey V. V. Chirkov, Daria A. A. Syrtsova, Julia V. V. Kostina, Igor I. I. Ponomarev, Igor P. P. Asanov, Yulia G. G. Bogdanova
Summary: In this study, a direct fluorination technique was used to treat the surface of PIM-1 films, and various instrumental techniques were employed to analyze the fluorinated samples. The results showed that fluorination mainly occurred in methylene- and methyl-groups, and cyano-groups, aromatic hydrogens, and the aromatic structure of PIM-1 were relatively stable under the fluorination conditions. Additionally, the fluorination time and film depth had an impact on the fluorine concentration and surface energy.
Article
Computer Science, Software Engineering
Jinyuan Liu, Mengdi Wang, Fan Feng, Annie Tang, Qiqin Le, Bo Zhu
Summary: A novel solid-fluid coupling method is proposed to capture subtle hydrophobic and hydrophilic interactions between liquid, solid, and air at their multi-phase junctions. The method utilizes a Lagrangian model and a mesh-based level set method to simulate various solid-fluid interaction phenomena.
ACM TRANSACTIONS ON GRAPHICS
(2022)
Article
Chemistry, Physical
Jeong-Won Lee, Kihwan Kim, Giwon Ryoo, Jisu Kim, Jeyaraj Vinoth Kumar, Woonbong Hwang
Summary: A new SHPo/SHPi patterning method for three-dimensional objects using aluminum was proposed in this study, achieving successful realization of patterned surfaces with contact angles of 10 degrees for SHPi surface and 160 degrees for SHPo surface. This method enables patterning even in areas that laser light cannot reach, expanding the application scope of SHPo/SHPi surface patterning technique.
APPLIED SURFACE SCIENCE
(2022)
Review
Chemistry, Physical
Dmitrii V. Antonov, Anastasya G. Islamova, Pavel A. Strizhak
Summary: The processes of interaction between liquid droplets and solid surfaces have attracted the interest of many researchers, as they are important for the development of technologies such as spray cooling, metal hardening, inkjet printing, anti-icing surfaces, fire extinguishing, and fuel spraying. The collisions of droplets with surfaces significantly affect heat transfer conditions and characteristics. Modifying the hydrophilic and hydrophobic properties of surfaces provides various functional properties to materials, such as enhanced heat transfer, resistance to corrosion and biofouling, and anti-icing. This review paper describes methods for achieving hydrophilic and hydrophobic surfaces, discusses the interaction features of liquid droplets with such surfaces, and explores the existing and potential applications of modified surfaces, as well as current research areas.
Article
Chemistry, Applied
Takayuki Kono, Kaoru Adachi, Yasuhisa Tsukahara
Summary: The morphology of graft block copolymers on the substrate can be controlled by designing side chains using segment affinities to the substrate.
REACTIVE & FUNCTIONAL POLYMERS
(2022)
Article
Thermodynamics
Abdullah Al-Sharafi, Bekir S. Yilbas, Ahmet Z. Sahin, H. Al-Qahtani
Summary: During the heating and stretching of the water droplet, necking of the droplet in the top plate region and elongated circulating structures in the vertical direction are observed. Additionally, the Nusselt number reaches large values prior to droplet stretching but decreases after stretching.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Chemistry, Physical
Jiandong Deng, Guozhu Jia
Summary: This study proposes a machine learning based model to accurately predict and explain the surface tension of electrolytes solution, and explores the effects of hydration shell layer on surface tension. The model combines machine learning algorithms, force field parameters of molecular dynamics simulations, and radial distribution function (RDF) to capture the structural features of electrolytes solution accurately. The prediction shows extremely low average relative deviation. The SHapley Additive explanation (SHAP) method is used to indicate the importance order of features. It is noted that the influence of the second hydration shell on surface tension may exceed that of the first hydration shell. This work provides a method for one-step acquisition of surface tension data, which not only accurately predicts physical and chemical properties of materials but also extends the application of molecular dynamics simulations, providing enlightening insights for detecting underlying physical mechanisms.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Chemistry, Applied
Bing Hu, Yisu Yang, Lingyu Han, Jixin Yang, Wenjie Zheng, Jijuan Cao
Summary: This study introduces three straightforward approaches to prepare hydrophilic hydrophobic core-shell microparticles using gel network-restricted antisolvent precipitation techniques. By immersing microgel beads made of hydrophilic polysaccharides in zein solutions, the protein layer on the microbead surfaces can be slowly and controlledly precipitated, resulting in the formation of hydrophilic hydrophobic core-shell structure. This technique can be applied to various gelling systems and can be customized in terms of particle sizes and shell thicknesses. The core-shell particles can be used for controlled delivery of fragrances, drugs, or other bioactive compounds, and can be tailored based on different input concentrations and preparation methods. Importantly, this technique is generalizable and can be extended to prepare diverse particles with different core-shell structures using various hydrophobic materials.
FOOD HYDROCOLLOIDS
(2022)
Article
Chemistry, Physical
Freshteh Sotoudeh, Reza Kamali, Seyed Mahmood Mousavi, Nader Karimi, Bok Jik Lee, Danial Khojasteh
Summary: This study investigates the dynamics of droplets impacting hybrid surfaces with varying wettabilities using a two-phase finite volume method. It is found that the maximum spreading factor for both Newtonian and non-Newtonian droplets is larger on surfaces with linear wettabilities, but minimal on stepwise wetting surfaces. The residence time of Newtonian droplets is longest on surfaces with a linear wettability distribution from hydrophilic to superhydrophobic, while for non-Newtonian droplets, it is longest on stepwise hydrophilic to superhydrophobic surfaces.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Chemistry, Physical
Anisha Bandyopadhyay, Jahur Alam Mondal
Summary: The interaction between a molecular hydrophobe and water is crucial for their mutual structure and reactivity. This study investigates the hydrogen-bonding structure and intermolecular vibrational coupling of water in the hydration shell of charged and uncharged molecular hydrophobes. The results show that the positive charge and branching of the alkyl chain reinforce the intermolecular vibrational coupling of water in the hydration shell. Additionally, weakly interacting dangling OH groups are found in the hydrophobic hydration shells. The net charge and alkyl chain configuration of the hydrophobe strongly affect the collective nature of water and the prevalence of dangling OH groups.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Chemistry, Analytical
Chandler A. Warr, Hunter S. Hinnen, Saroya Avery, Rebecca J. Cate, Gregory P. Nordin, William G. Pitt
Summary: This study investigated two approaches to successfully form droplets in 3D-printed microfluidic devices: using hydrophobic resins and a unique annular channel-in-channel geometry. These approaches prevent water-in-oil droplets from sticking to the interior surfaces of the droplet generator and enable stable droplet formation.
Article
Chemistry, Physical
Xin Li, Ruiliang Liu, Ming Yao, Jianbo Zhang, Yong Liu
Summary: The electrospinning method was used to fabricate microporous layers (MPL) with three-dimensional inter-connected pore structure. Hydrophobic and hydrophilic electrospun MPLs (E-MPLs) were realized using different materials in the electro-spinning ink. The E-MPLs showed larger porosity and wider pore size distribution compared to commercial MPL, and exhibited different properties under different relative humidity conditions. Fuel cells with a double-layer E-MPL performed well under a wider range of relative humidity and showed better dynamic response.
JOURNAL OF POWER SOURCES
(2022)
Article
Food Science & Technology
Ziye Wang, Shuzhen Cheng, Di Wu, Zhe Xu, Shiqi Xu, Maolin Tu, Ming Du
Summary: Probiotics like Lactobacillus are beneficial bacteria that can promote digestion and boost the immune system.
INTERNATIONAL JOURNAL OF FOOD SCIENCE AND TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Shun Aoyama, Hiroki Nagasawa, Masakoto Kanezashi, Toshinori Tsuru
Summary: In this study, a novel atmospheric-pressure water vapor plasma modification method was developed to enhance the pervaporation performance of organosilica membranes. The plasma treatment significantly improved the surface hydrophilicity and molecular sieving properties of the membranes, leading to high selectivity and permeance in the dehydration of alcohol solutions.
Article
Chemistry, Physical
Mirabbos Hojamberdiev, Ronald Vargas, Zukhra C. Kadirova, Kosaku Kato, Hadi Sena, Aleksei G. Krasnov, Akira Yamakata, Katsuya Teshima, Martin Lerch
Summary: Doping with 5% aliovalent metal cations at the B site can enhance the visible light-induced photocatalytic H-2 and O-2 evolution efficiency of BaTaO2N, without altering its crystal structure and optical absorption properties.
Article
Chemistry, Multidisciplinary
Qi Guo, Tomohiro Higashino, Kosaku Kato, Akira Yamakata, Hiroshi Imahori
Summary: Donor-pi-acceptor type porphyrin-fullerene dyads with an acetylene bridge were designed and synthesized. The dyad was found to produce a stable charge-separated state in benzonitrile. Compared to the porphyrin reference without the fullerene moiety, the p-type dye-sensitized solar cells with the dyad exhibited higher photovoltaic performance.
Article
Chemistry, Multidisciplinary
Kenta Aihara, Kosaku Kato, Tomoki Uchiyama, Shuhei Yasuda, Toshiyuki Yokoi, Akira Yamakata, Yoshiharu Uchimoto, Kazuhiko Maeda
Summary: Modification with Rh and Pd cocatalysts on Pb2Ti2O5.4F1.2 surface enhances the electron-capturing ability of the catalyst, leading to significantly improved activity for visible-light H-2 evolution.
CHEMISTRY-A EUROPEAN JOURNAL
(2022)
Article
Chemistry, Physical
Kosaku Kato, Yohei Uemura, Kiyotaka Asakura, Akira Yamakata
Summary: Defects in powder photocatalysts have a significant impact on their photocatalytic activity. The presence of oxygen vacancies in WO3 was found to act as recombination centers, accelerating the decay of deeply trapped electrons. However, the effect of oxygen vacancies on carrier dynamics differs among various photocatalysts. The distance between defects plays an important role in determining the enhancement or reduction in photocatalytic activity.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Hiromu Fuse, Yu Irie, Masaaki Fuki, Yasuhiro Kobori, Kosaku Kato, Akira Yamakata, Masahiro Higashi, Harunobu Mitsunuma, Motomu Kanai
Summary: In this study, we developed an organocatalyst system that can promote the cleavage of stable C-H bonds through a hydrogen atom transfer process without the use of exogenous photosensitizers. The electronically tuned thiophosphoric acid, 7,7'-OMe-TPA, was assembled with substrate or co-catalyst N-heteroaromatics to form electron donor-acceptor complexes. Photoirradiation of these complexes induced stepwise single-electron transfer processes to generate a HAT-active thiyl radical. Spectroscopic studies and theoretical calculations characterized the stepwise SET process mediated by short-lived intermediates. This organocatalytic HAT system showed high functional group tolerance in four different C-H functionalization reactions.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Physical
Fumiaki Amano, Yasukazu Akaki, Akira Yamakata
Summary: This study investigates the effect of hydroxy substituents of Alizarin molecules on photocatalytic hydrogen evolution over a dye-sensitized Pt-TiO2 system. The 2-hydroxy group enhances electron injection and suppresses back electron transfer.
CATALYSIS SURVEYS FROM ASIA
(2023)
Article
Chemistry, Multidisciplinary
Kaihong Chen, Jiadong Xiao, Junie Jhon M. Vequizo, Takashi Hisatomi, Yiwen Ma, Mamiko Nakabayashi, Tsuyoshi Takata, Akira Yamakata, Naoya Shibata, Kazunari Domen
Summary: This research successfully developed a SrTaO2N-based particulate photocatalyst for visible light-driven overall water splitting. The loading of RuIrOx nanoparticles promoted charge separation and enhanced the water splitting activity of SrTaO2N photocatalyst.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Correction
Green & Sustainable Science & Technology
Zichao Lian, Yoichi Kobayashi, Junie Jhon M. Vequizo, Chandana Sampath Kumara Ranasinghe, Akira Yamakata, Takuro Nagai, Koji Kimoto, Katsuaki Kobayashi, Koji Tanaka, Toshiharu Teranishi, Masanori Sakamoto
NATURE SUSTAINABILITY
(2023)
Article
Nanoscience & Nanotechnology
Noritaka Sakakibara, Mitsuhiko Shizuno, Tomoki Kanazawa, Kosaku Kato, Akira Yamakata, Shunsuke Nozawa, Tsuyohito Ito, Kazuo Terashima, Kazuhiko Maeda, Yusuke Tamaki, Osamu Ishitani
Summary: Plasma surface modification of graphitic carbon nitride (C3N4) improves the affinity and electron transfer at the interface of a hybrid photocatalyst consisting of C3N4 and a Ru(II)-Ru(II) binuclear complex (RuRu'). This leads to enhanced HCOOH production rate and selectivity under visible-light irradiation.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Hajime Suzuki, Takanori Takashima, Osamu Tomita, Tomoki Kanazawa, Shunsuke Nozawa, Kosaku Kato, Akira Yamakata, Kouichi Nakashima, Akinori Saeki, Ryu Abe
Summary: In this study, a Bi6NbWO14Cl photocatalyst was synthesized using Rh(2)O(3) additives and its surface was modified with Rh species to improve its photocatalytic activity. The addition of an appropriate amount of Rh2O3 significantly enhanced the O-2 evolution rate on Bi6NbWO14Cl, likely due to enhanced charge transfer by metallic Rh nanoparticles. Surface modification with Rh species further enhanced the O-2 evolution rate, achieving an apparent quantum efficiency of 11% at 420 nm, the best reported performance for oxyhalides prepared by solid-state reactions. The roles of these Rh species in the enhanced photocatalytic activities were discussed.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Junie Jhon M. Vequizo, Kosaku Kato, Fumiaki Amano, Akira Yamakata
Summary: This study investigates the impact of hydrogen reduction treatment on the photocarriers in rutile TiO2. The results reveal that the reduction treatment leads to filling of shallower trap states, extended lifetimes of electrons and holes, and reduced radiative recombination. This strategy can potentially be applied to other photocatalytic materials.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Shimpei Naniwa, Kosaku Kato, Akira Yamamoto, Hisao Yoshida, Akira Yamakata
Summary: Heterogeneous photocatalysis is a promising technology for artificial photosynthesis and environmental remediation. Understanding trap states of photoexcited carriers is crucial for the development of efficient photocatalysts. This study found that the depth of electron traps on anatase TiO2 nanoparticles decreases with increasing particle size.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Akinobu Miyoshi, Megumi Okazaki, Kosaku Kato, Tomoki Kanazawa, Toshiyuki Yokoi, Shunta Nishioka, Shunsuke Nozawa, Akira Yamakata, Kazuhiko Maeda
Summary: The development of a photocatalyst capable of evolving H-2 from water under visible light is important. Pd was found to be the best-performing cocatalyst for TiO2:N,F under UV-vis irradiation. However, under visible-light irradiation, the activity of Pd/TiO2:N,F for H-2 evolution was negligibly small.
Article
Chemistry, Physical
Shinji Nishimae, Junie Jhon M. Vequizo, Yasunobu Inoue, Akira Yamakata, Mamiko Nakabayashi, Tomohiro Higashi, Kazunari Domen
Summary: Barium tantalum oxynitride (BaTaO2N) photocatalyst was synthesized through NH3-based nitridation of a mixture of BaCO3 and amorphous Ta2O5•3H2O. It exhibited high photocatalytic activity for overall water splitting under visible light up to a wavelength of 540 nm. Mild nitridation conditions resulted in high-performance specimens, while prolonged nitridation decreased the activity. The reactivity of amorphous Ta2O5•3H2O nanoparticles played an important role in the formation of active BaTaO2N.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Multidisciplinary
Tomokazu Umeyama, Daizu Mizutani, Yuki Ikeda, W. Ryan Osterloh, Futa Yamamoto, Kosaku Kato, Akira Yamakata, Masahiro Higashi, Takumi Urakami, Hirofumi Sato, Hiroshi Imahori
Summary: We have achieved a long-lived and highly emissive charge-transfer excited state between an organic conjugated molecule and a two-dimensional semiconducting inorganic nanosheet by precisely designing the bridge structure. This research is of great significance for energy conversion, optoelectronic devices, and sensors.
