研究者詳細 - 萩尾　健史

論文 - 萩尾　健史

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Facile Synthesis of Spherical Porous Tricobalt Tetroxide and Metal Cobalt for High Quality Cobalt Production and Recycling 査読有り国際誌

Matsunaga, S; Suzuki, T; Hagio, T; Park, JH; Kamimoto, Y; Ichino, R; Takeshita, K; Sato, F; Sasaya, K; Iguchi, T; Tsunekawa, M

MATERIALS TRANSACTIONS 64 巻 ( 12 ) 頁： 2739 - 2747 2023年

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Materials Transactions

Liquid-phase synthesis is suitable for controlling the morphological and structural properties of functional inorganic materials and such control is important because they strongly affect the functionality of the product. Cobalt-based materials is one group of materials that requires control of powder morphology and structure. Cobalt is an important metal element used in various industrial fields such as secondary batteries, superalloys, permanent magnets, hard metals, and catalysts. The ever-growing demand of cobalt highlights that there is an urgent necessity to develop high quality material synthesis methods and to secure cobalt resources for countries that rely on import like Japan. Especially, technologies to recycle cobalt in a form reusable for secondary batteries and catalysts are desired because further increase in demand is anticipated. Meanwhile, spherical porous tricobalt tetroxide secondary particles obtained by calcination of spherical cobalt carbonate precursors have been reported to be promising materials for battery applications. Moreover, porous metal cobalt obtained by hydrogen reduction of tricobalt tetroxide is known to be effective for catalyst applications. However, conventional methods to synthesize spherical cobalt carbonate requires addition of additives in the reaction mixtures or otherwise requires hydrothermal treatment in pressure vessels. These are unfavorable to develop a practical and sustainable process for cobalt-based material production and recycling. In this study, a facile room temperature synthesis method to prepare spherical cobalt carbonate precursors from solutions of cobalt chloride and ammonium hydrogen carbonate that does not require any additives or hydrothermal treatment is developed by optimizing the carbonate solution concentration, carbonate/cobalt salt molar ratio, and stirring time during reaction. Furthermore, we succeeded in obtaining porous tricobalt tetroxide and porous metal cobalt that carry on the exterior spherical morphology of the original cobalt carbonate precursor by calcination and hydrogen reduction. The developed process shall contribute to realize high quality cobalt-based material production and recycling.

DOI： 10.2320/matertrans.M-M2023809

Oxidation evolutions of soot surface and pore properties with different O-2-NO2 mixtures and temperatures 査読有り国際共著国際誌

Ma Yongzhi, Zhao Pengcheng, Fang Mingming, Hagio Takeshi, Li Xinling

FULLERENES NANOTUBES AND CARBON NANOSTRUCTURES 30 巻 ( 10 ) 頁： 1066 - 1074 2022年10月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Fullerenes Nanotubes and Carbon Nanostructures

Soot oxidation evolutions at various oxidation degrees under different O2-NO2 mixtures and temperatures were performed. Results indicated that the internal burning-out process represented by shell-like particles at 500 °C independent on NO2 concentration, while the development of hollow shells for the soot was suppressed with increasing the temperature. A tendency with soot toward a less ordered arrangement with short and defective graphene layers after oxidizing at 500 °C was also observed, which was suppressed with added NO2 and increasing temperature. Many carbon oxygen functionalities produced at 40% oxidation and the intensity of the peak gradually increased as the increase of the oxidation degree, while the increase of the peak intensity became less sensitive with added NO2 and increasing temperature. Abundant micropores and mesopores formed inside the particles during the soot oxidation process depending on oxidizer and temperature, micropores (smaller than 2 nm) were extensively generated at the early stages of the oxidation while mesopores increased sharply after 20% oxidation. The trends were correspondent to the oxidation modes with different oxidizer and temperature. The correlationship observation suggested that soot oxidation behavior was dependent on competing rates of reaction kinetics versus mass transport of oxidizer according to the oxidation evolution of surface and pore.

DOI： 10.1080/1536383X.2022.2072831

Aluminum Electrodeposition on the Surface of Boron Carbide Ceramics by Use EMIC-AlCl3 Ions Liquid 査読有り国際誌

Gou Roujia, Park Jae-Hyeok, Yamashita Seiji, Hagio Takeshi, Ichino Ryoichi, Kita Hideki

COATINGS 12 巻 ( 10 ) 2022年10月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Coatings

Coating technology is decisively important for metallization of ceramic materials and ceramic metal sealing technology. Previous studies have shown that the network-like structure after penetration of molten aluminum can significantly improve the strength of joint components. However, the direct aluminum coating method is limited by the shape of the substrate. To obtain a dense aluminum film on the surface of B4C, in this study, aluminum was deposited by pulse electroplating in EMIC–AlCl3 ionic liquid. The deposited metals were observed and analyzed by SEM–EDS and XRD. A Vickers hardness tester was adopted as an auxiliary equipment to clarify the film quality. The results show that frequency and duty cycle have significant effects on crystal orientation. The content of oxides in the contact gap reduces the bonding strength of the deposited metal, which provides experimental basis for metal electrodeposition on B4C.

DOI： 10.3390/coatings12101535

Facile synthesis of amine-functionalized three-dimensional graphene composites for CO2 capture 査読有り国際共著国際誌

Sun Hefei, Zhang Qinggang, Hagio Takeshi, Ryoichi Ichino, Kong Long, Li Liang

SURFACES AND INTERFACES 33 巻 2022年10月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Surfaces and Interfaces

Excessive emissions of carbon dioxide (CO2) cause the greenhouse effect. CO2 capture and storage has been recognized as an important solution for reducing carbon dioxide emissions and coping with global warming. The synthesis of porous materials for effective CO2 adsorption is considered to be one of the most possible methods for CO2 capture and storage at present, however, achieving selective and efficient CO2 adsorption and conversion is still quite a challenge. Herein, a series of three-dimensional graphene-based materials (3D GBMs) were synthesized by alkali metal involved method, which showed high specific surface area (477.56 m2 g−1–792.96 m2 g−1) and abundant micropore and mesopore surface structures. We demonstrated that introducing N-containing or O-containing functional groups into the carbon framework can create more surface microporous structures and active adsorption sites, and significantly enhance the CO2 adsorption performance of 3D GBMs. Furthermore, it was found that the simultaneously introduction of the two kinds of functional groups into 3D GBMs could further increase the adsorption capacity of CO2 (from 2.06 mmol g−1 to 4.79 mmol g−1). All the above results indicate the treated 3D GBMs could have a great potential as efficient adsorbent in CO2 capture and storage.

DOI： 10.1016/j.surfin.2022.102256

Amine-Modified Small Pore Mesoporous Silica as Potential Adsorbent for Zn Removal from Plating Wastewater 査読有り国際誌

Phouthavong Vanpaseuth, Park Jae-Hyeok, Nishihama Tatsuo, Yoshida Shuhei, Hagio Takeshi, Kamimoto Yuki, Ichino Ryoichi

COATINGS 12 巻 ( 9 ) 2022年9月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Coatings

The removal of Zn from wastewater generated from the Zn-based electroplating manufacturing process is essential because the regulation limit of Zn concentration in wastewater is becoming stricter in Japan. However, achieving this through conventional methods is difficult, especially for small and medium enterprises in the plating industry. Therefore, a suitable Zn-removal method with a low cost but high performance and Zn selectivity is required. The application of adsorbents is one possible solution. Mesoporous silica (MS) is a well-known adsorbent with controllable pore size, high specific surface area (SSA), high acid resistance, and ease of surface modification. In this study, we modified the surfaces of MSs with different initial pore sizes by amino groups and investigated their Zn removal performances. The effect of pore size on amine modification using (3-aminopropyl)triethoxysilane and on adsorption performance in a single system was investigated along with Zn adsorption selectivity in the Zn–Ni binary system. Amine-modified MS prepared from MS with an initial pore size of 1.9 nm showed drastically lower performance compared to those prepared from MS with an initial pore size larger than 2.8 nm. Zn-selectivity in the Zn–Ni binary system, containing equal amounts of Zn and Ni, was found to reach a maximum of 21.6 when modifying MS with an initial pore size of 2.8 nm.

DOI： 10.3390/coatings12091258

Effect of Zn-Mg interlayer on the corrosion resistance of multilayer Zn-based coating fabricated by physical vapor deposition process 査読有り国際共著国際誌

Park J.H., Ko K.P., Hagio T., Ichino R., Lee M.H.

Corrosion Science 202 巻 2022年7月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Corrosion Science

A novel Zn/Zn-Mg/Zn multilayer coating is prepared on steel plate by PVD. The effect of the multilayer structure comprising Zn-Mg interlayer on the corrosion resistance is discussed. The corrosion resistance is evaluated by the salt spray test, and the corrosion progression is analyzed by electrochemical impedance spectroscopy and corrosion products observation. Eluted Mg ions from the Zn-Mg interlayer form a porous Mg corrosion product layer that permeates chlorine ions, assists the coating transform to Zn5(OH)8Cl2·H2O phase. Improved corrosion resistance of the coating can be explained by the rapid increasement of the impedance by the formation of the protective Zn5(OH)8Cl2·H2O phase.

DOI： 10.1016/j.corsci.2022.110330

Impedance Characteristics of Monolayer and Bilayer Graphene Films with Biofilm Formation and Growth. 査読有り国際共著国際誌

Nakagawa R, Saito K, Kanematsu H, Miura H, Ishihara M, Barry DM, Kogo T, Ogawa A, Hirai N, Hagio T, Ichino R, Ban M, Yoshitake M, Zimmermann S

Sensors (Basel, Switzerland) 22 巻 ( 9 ) 2022年5月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Sensors

Biofilms are the result of bacterial activity. When the number of bacteria (attached to materials’ surfaces) reaches a certain threshold value, then the bacteria simultaneously excrete organic polymers (EPS: extracellular polymeric substances). These sticky polymers encase and protect the bacteria. They are called biofilms and contain about 80% water. Other components of biofilm include polymeric carbon compounds such as polysaccharides and bacteria. It is well-known that biofilms cause various medical and hygiene problems. Therefore, it is important to have a sensor that can detect biofilms to solve such problems. Graphene is a single-atom-thick sheet in which carbon atoms are connected in a hexagonal shape like a honeycomb. Carbon compounds generally bond easily to graphene. Therefore, it is highly possible that graphene could serve as a sensor to monitor biofilm formation and growth. In our previous study, monolayer graphene was prepared on a glass substrate by the chemical vapor deposition (CVD) method. Its biofilm forming ability was compared with that of graphite. As a result, the CVD graphene film had the higher sensitivity for biofilm formation. However, the monolayer graphene has a mechanical disadvantage when used as a biofilm sensor. Therefore, for this new research project, we prepared bilayer graphene with high mechanical strength by using the CVD process on copper substrates. For these specimens, we measured the capacitance component of the specimens’ impedance. In addition, we have included a discussion about the possibility of applying them as future sensors for monitoring biofilm formation and growth.

DOI： 10.3390/s22093548

Simultaneous reduction and sequestration of hexavalent chromium by magnetic β-Cyclodextrin stabilized Fe<sub>3</sub>S<sub>4</sub>. 査読有り国際共著国際誌

Kong L, Yan R, Liu M, Xu J, Hagio T, Ichino R, Li L, Cao X

431 巻頁： 128592 2022年2月

Magnetic Adsorbents for Wastewater Treatment: Advancements in Their Synthesis Methods 査読有り国際共著国際誌

Phouthavong V., Yan R., Nijpanich S., Hagio T., Ichino R., Kong L., Li L.

Materials 15 巻 ( 3 ) 2022年2月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：MDPI

The remediation of water streams, polluted by various substances, is important for realizing a sustainable future. Magnetic adsorbents are promising materials for wastewater treatment. Although numerous techniques have been developed for the preparation of magnetic adsorbents, with effective adsorption performance, reviews that focus on the synthesis methods of magnetic adsorbents for wastewater treatment and their material structures have not been reported. In this review, advancements in the synthesis methods of magnetic adsorbents for the removal of substances from water streams has been comprehensively summarized and discussed. Generally, the synthesis methods are categorized into five groups, as follows: direct use of magnetic particles as adsorbents, attachment of pre-prepared adsorbents and pre-prepared magnetic particles, synthesis of magnetic particles on pre-prepared adsorbents, synthesis of adsorbents on preprepared magnetic particles, and co-synthesis of adsorbents and magnetic particles. The main improvements in the advanced methods involved making the conventional synthesis a less energy intensive, more efficient, and simpler process, while maintaining or increasing the adsorption performance. The key challenges, such as the enhancement of the adsorption performance of materials and the design of sophisticated material structures, are discussed as well.

DOI： 10.3390/ma15031053

光触媒を用いたダイヤモンドのアミノ基修飾と銅基質に対する高分散複合化技術査読有り

加藤華月, 石田直哉, 鈴木孝宗, 藤本憲次郎, 萩尾健史, 市野良一, 近藤剛史, 湯浅真, 上塚洋, 藤嶋昭, 寺島千晶

表面技術 72 巻 ( 12 ) 頁： 701 - 703 2021年12月

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：一般社団法人表面技術協会

<p>We strove to produce a microdiamond（MD）- copper composite by electroplating. Unfortunately, copper is naturally non-wetting with MD because of their chemical incompatibility. We achieved modification of the amino group for the MD surface using a photocatalytic treatment, followed by electroplating of the copper. Results demonstrated that the MD - copper composite material assisted by photocatalysis markedly improved their interfacial affinity and thermal conductivity.</p>

DOI： 10.4139/sfj.72.701

Synthesis of 3D graphene-based materials and their applications for removing dyes and heavy metals 査読有り国際共著国際誌

Sun Hefei, Lin Yan, Takeshi Hagio, Wang Xinze, Wu Deyi, Tian Yanqin

ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH 28 巻 ( 38 ) 頁： 52625 - 52650 2021年10月

Preparation of amino group functionalized diamond using photocatalyst and thermal conductivity of diamond/copper composite by electroplating 査読有り国際誌

Ishida Naoya, Kato Kazuki, Suzuki Norihiro, Fujimoto Kenjiro, Hagio Takeshi, Ichino Ryoichi, Kondo Takeshi, Yuasa Makoto, Uetsuka Hiroshi, Fujishima Akira, Terashima Chiaki

DIAMOND AND RELATED MATERIALS 118 巻頁： 108509 2021年10月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Diamond and Related Materials

We focused on a micro diamond (MD) particle with the highest thermal conductivity among existing materials and aimed to make a MD/copper composite material by electroplating. However, copper is naturally non-wetting with MD due to its chemical incompatibility, leading to weak interfacial bonding and high thermal resistance. We improved the wettability between MD and copper functionalized by the amino group on the MD using a photocatalytic reaction. The functionalization of the diamond surface by amino groups was achieved by treating the MDs in a 3-aminopropyltrimethoxysilane-containing solution. The amino group functionalized MD was dispersed in the electroplating bath, where copper was deposited on the MD. As a result, the composite material of amino group functionalized MD assisted by photocatalyst and copper improved their interfacial affinity and exhibited the high thermal conductivity of 595 W/m K.

DOI： 10.1016/j.diamond.2021.108509

Evenly distribution of amorphous iron sulfides on reconstructed Mg-Al hydrotalcites for improving Cr(VI) removal efficiency 査読有り国際共著国際誌

Yan Ruixin, Feng Xiuping, Kong Long, Wan Qun, Zheng Weilin, Hagio Takeshi, Ichino Ryoichi, Cao Xinde, Li Liang

CHEMICAL ENGINEERING JOURNAL 417 巻頁： 129228 2021年8月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Chemical Engineering Journal

Hexavalent Chromium (Cr(VI)) in water is a public health concern and has been a challenging research subject in environmental field for many years. Herein, a novel composite material consisting of amorphous iron sulfides supported on hydrotalcites (FeS/HTs) was synthesized by “calcination-reconstruction-calcination” process, which enables homogeneous distribution of iron and sulfur on the surface of hydrotalcites (HT). The composite (mass ratio of FeS/HT was 1/2) could effectively remove over 98% of Cr(VI) within 10 min. A pseudo-second-order kinetic model and a Langmuir isotherm model were well fitted the sorption data with a maximum removal capacity of 206.2 mg/g. The superior adsorption capacity of FeS/HTs could be attributed to the combination of the advantages of abundant adsorption sites on HT and powerful reduction properties of iron sulfides. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analysis suggested the adsorbed Cr(VI) on the surface and interlayer of FeS/HTs had been reduced to Cr(III) by reductant iron and sulfur. This study demonstrated that FeS/HTs has potential application prospects in Cr(VI) removal.

DOI： 10.1016/j.cej.2021.129228

Electroplating of copper/microdiamond composites and the effect of diamond surface functionalization 査読有り国際誌

Naruse Yuto, Park Jae-Hyeok, Hagio Tkeshi, Kamimoto Yuki, Ichino Ryoichi, Bessho Takeshi

FUNCTIONAL MATERIALS LETTERS 14 巻 ( 05 ) 2021年7月

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Functional Materials Letters

Compositing diamonds with high thermally conductive metals, such as copper, have attracted much attention in recent years. In this study, we prepared copper/diamond composites by electroplating and investigated the effect of the surface functionalization of diamond on the interfacial adhesion of copper and diamond in the composite. Oxygen-containing groups were introduced on the diamond surface by a hydrothermal treatment and amino groups were further introduced using a silane coupling agent. Surface functionalization of diamond with both these groups led to drastically increased wettability against the copper sulfate solution and improved the interfacial adhesion of copper and diamond in the composite. Compared with that of the plating based on pristine diamond, the thermal conductivity of the platings based on diamond functionalized with oxygen-containing groups and amino groups increased by 42 and 31 W m-1 K-1, respectively. Thus, diamond surface functionalization effectively improved the adhesion at the copper/diamond interface in electroplated copper/diamond composites.

DOI： 10.1142/S1793604721510231

Effect of SiC formation temperature on improvement in thermal conductivity of electrodeposited SiC-coated diamond/Cu composite plating 査読有り国際誌

Naruse Yuto, Park Jae-Hyeok, Hagio Takeshi, Kamimoto Yuki, Bessho Takeshi, Ryoichi Ichino

COMPOSITE INTERFACES 2021年6月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Composite Interfaces

Diamond/Cu composites are considered promising heat spreader materials; however, improving the interfacial adhesion between diamond and Cu is a challenge in manufacturing these composites. We focused on the surface modification of diamonds and previously reported that the formation of a SiC on the diamond surface effectively enhances the diamond/Cu interfacial adhesion, as well as thermal conductivity. In this study, the optimum treatment temperature to form SiC on diamond to apply to SiC-coated diamond/Cu composite platings for improving the interfacial adhesion and thermal conductivity is investigated. The formation of SiC on the diamond surface was greatly affected by the treatment temperature, and the coverage of the SiC coating on the diamonds increased with treatment temperature. The formation of a more uniform SiC coating contributed to improved interfacial adhesion between the diamond and electrodeposited Cu matrix. The thermal conductivity of the SiC-coated diamond/Cu composite plating generally increased with an increase in temperature; however, excessive heat treatment at 1450°C decreased the thermal conductivity. The composite platings using SiC-coated diamond prepared at 1400°C showed a maximum thermal conductivity of 454 Wm−1K−1, which was higher than that of pure Cu platings (373 Wm−1K−1) and pristine diamond/Cu composite platings (375 Wm−1K−1).

DOI： 10.1080/09276440.2021.1937856

Nano ferric oxide adsorbents with self-acidification effect for efficient adsorption of Sb(V) 査読有り国際共著国際誌

Feng X., Yan R., Zhang Q., Wan Q., Hagio T., Ichino R., Kong L., Cao X., Li L.

Chemosphere 272 巻 2021年6月

The effect of bath pH on electrodeposition and corrosion properties of ternary Fe-W-Zn alloy platings 査読有り国際誌

Park Jae-Hyeok, Hagio Takeshi, Kamimoto Yuki, Ichino Ryoichi

JOURNAL OF SOLID STATE ELECTROCHEMISTRY 25 巻 ( 6 ) 頁： 1901 - 1913 2021年6月

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of Solid State Electrochemistry

As a new trial to improve the corrosion resistance of the Fe-W alloy platings, Fe-W alloys incorporating a small amount of Zn, namely novel ternary Fe-W-Zn alloy platings, are prepared by constant current electrolysis using citrate-ammonia baths. In this study, the effects of bath pH on elemental composition, morphology, plating structure, and corrosion resistance of the electrodeposited ternary alloy platings are investigated. The W content of the electrodeposited alloys showed a maximum of 31.5 at.% at pH 8.0 and an inverse correlation was observed between the W content and current efficiency in the investigated pH range. The Zn content tended to decrease with increasing bath pH, and the structure of alloy platings gradually refined along with the increase in the amount of Zn incorporated into the Fe-W alloy. Potentiodynamic polarization test results reveal fine granular structured ternary Fe-W-Zn alloy prepared at pH 8.0, containing approximately 1.6 at.% of Zn, which showed distinctly enhanced corrosion resistance in a 1 M H2SO4 solution compared to binary Fe-W alloy and ternary alloys prepared at pH 6.0, 7.0, and 9.0. It has been found that the bath pH has a great influence on the elemental composition of the ternary alloys, which significantly affects the plating structure and corrosion resistance of the alloy platings.

DOI： 10.1007/s10008-021-04964-4

Band Gap Engineering toward Wavelength Tunable CsPbBr3 Nanocrystals for Achieving Rec. 2020 Displays 査読有り国際共著国際誌

Zhang Qinggang, Sun Xiaochuan, Zheng Weilin, Wan Qun, Liu Mingming, Liao Xinrong, Hagio Takeshi, Ichino Ryoichi, Kong Long, Wang Huamiao, Li Liang

CHEMISTRY OF MATERIALS 33 巻 ( 10 ) 頁： 3575 - 3584 2021年5月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Chemistry of Materials

For next-generation high-definition displays, the newly recommendation 2020 (Rec. 2020) standard calls for the emission wavelength of green emitters to be kept at 525-535 nm with narrow emission line width below 25 nm. All-inorganic lead halide perovskite CsPbBr3 nanocrystals (NCs) with sharp emission seem as the prefect one to match the call, however, it is a great challenge to tune their emission wavelength to the target window of 525-535 nm because of the intrinsic band gap of CsPbBr3. Herein, we report a facile strategy to prepare CsPbBr3 NCs with finely tunable emissions in the narrow range of 525-535 nm by establishing a CsPbBr3-Cs4PbBr6:Na Type II structure. The doping of the Na ions is the key factor to construct the Type II structure, which induces the formation of the Cs4PbBr6:Na phase and builds CsPbBr3-Cs4PbBr6:Na Type II structure, leading to the tunable emission wavelength of CsPbBr3 NCs. The as-synthesized CsPbBr3 NCs exhibit an ideal emission at 525-535 nm with a narrow emission line width of 23 nm and a high photoluminescence quantum yield (PLQY) of 85%. As a green downconverter, an ultrapure green backlight covers 97% of the Rec. 2020 standard in the CIE 1931 color space, representing the "greenest"backlight up to now.

DOI： 10.1021/acs.chemmater.1c00145

Progress in modifications of 3D graphene-based adsorbents for environmental applications 査読有り国際共著国際誌

Lin Y., Tian Y., Sun H., Hagio T.

Chemosphere 270 巻 2021年5月

Facile Hydrothermal Synthesis of EAB-Type Zeolite under Static Synthesis Conditions 査読有り国際共著国際誌

Hagio Takeshi, Park Jae-Hyeok, Lin Yan, Tian Yanqin, Hu Yun Hang, Li Xinling, Kamimoto Yuki, Ichino Ryoichi

CRYSTAL RESEARCH AND TECHNOLOGY 56 巻 ( 4 ) 頁： 2000163 2021年4月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Crystal Research and Technology

Conventionally, EAB-type zeolites are crystallized by hydrothermal synthesis for many days under agitational synthesis conditions such as rotation or stirring. In the present study, EAB-type zeolite is obtained by hydrothermal synthesis within 12 h under static synthesis conditions for the first time. The effects of crystallization temperature, aging of the precursor sol, and addition of seed crystals are investigated. The results reveal that EAB-type zeolite can be obtained when using a precursor sol with short aging time followed by hydrothermal synthesis in a very narrow temperature range 110 °C−120 °C under static synthesis condition. Addition of seed crystals is found to suppress the formation of SOD-type zeolite, the primary phase at high hydrothermal synthesis temperatures, while it does not increase the crystallization rate of EAB-type zeolite. Furthermore, the crystallization behavior at 120 °C is examined by varying the synthesis time. EAB-type zeolite with invariably twinned plate-like morphology starts to crystallize between synthesis time of 3 to 6 h at 120 °C under the static synthesis condition.

DOI： 10.1002/crat.202000163

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