論文 - 桑 静
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Effect of thermal history control on mechanical properties of laser powder bed fusion maraging steel
Jingguang Du, Jinhui Huang, Chaolin Tan, Xusheng Yang, Linqing Liu , Yan Wang, Jing Sang, Di Wang
Materials Characterization 224 2025年04月 [査読有り]
学術誌 共著・分担
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Electrical corrosion behavior and erosion mechanism of conductive hard films during current-carrying friction
Mingchong Lu, Jiahua Zhang, Peng Zhang, Qiwei Wang, Jing Sang, Hidetoshi Hirahara, Sumio Aisawa , Dexin Chen
Diamond and Related Materials 153 112018 2025年01月 [査読有り]
学術誌 共著・分担
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金属樹脂接合界面における化学的相互作用
平原 英俊
加工成形 35 ( 9 ) 290 - 294 2023年09月 [査読有り]
学術誌 共著・分担
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Submicrometer analyses of the polymer flow modifier effects on metal–polymer direct joining
Shuohan Wang, Fuminobu Kimura, Weiyan Chen, Jing Sang, Hidetoshi Hirahara, Yusuke Kajihara
Materials Letters 347 ( 134655 ) 2023年06月 [査読有り]
国際的学術誌 共著・分担
Polymer modification is a promising approach to improve the joining performance of injection molded direct joining (IMDJ) technology. However, the factors contributing to the improved joining strength of submicron scale surface pattern joints have not been fully elucidated. In this study, we investigated the mechanism for improving the joining performance of polyamide 6 (PA6)/aluminum alloy A5052 joints with Blast + hot water treated metal structure using a flow modifier (OSGOL MF-11). Enhanced mechanical polymer infiltration at the submicron scale was confirmed, and the hydrogen bond generation at the joint interface was characterized. These findings elucidate the reason for the joining performance improvement caused by the flow modifier in the submicron scale.
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Superhydrophobic coatings by electrodeposition on Mg–Li alloys: Attempt of armor-like Ni patterns to improve the robustness
Hongyuan He, Jiebin Du, Jing Sang, Hidetoshi Hirahara, Sumio Aisawa, Dexin Chen
Materials Chemistry and Physics 304 ( 127902 ) 2023年05月 [査読有り]
国際的学術誌 共著・分担
Due to the fragility of the layered structure, the mechanical properties of superhydrophobic surfaces, particularly wear resistance, are still too poor, limiting the industrial application of protecting magnesium-lithium (LZ91) alloys from corrosion. As a result, we’re testing screen-printed masks to electroplate armor-like Ni columns. Then, using electrodeposition, compact micro/nanometer-sized papillary structured superhydrophobic surfaces are created on Mg–Li alloys, which exhibit good low viscosity, self-cleaning, chemical stability, and excellent corrosion resistance with a 2 order of magnitude decrease in corrosion current density in both corrosive media. Surprisingly, increasing the deposition time causes the dissolution of Cu anode electrodes and the subsequent formation of Cu compounds on the superhydrophobic coating, resulting in the formation of dense needle-like structures on these papillae. Even after the superhydrophobic structures are worn away, the armor-like Ni col- umns reduce the contact angle’s tendency to decrease. This proposed deposition method provides a simple and fast process for protecting the surface of Mg–Li alloys, and the concept of armored Ni patterns may pave the way for future advances in the robustness and application of superhydrophobic coatings.
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Failure mechanisms of the bonded interface between mold epoxy and metal substrate exposed to high temperature
Shuaijie Zhao, Chuantong Chen, Motoharu Haga, Minoru Ueshima, Hidetoshi Hirahara, Jing Sang, Sung hun Cho, Tohru Sekino, Katsuaki Suganuma
Composites. Part B. Engineering 254 ( 110562 ) 2023年01月 [査読有り]
国際的学術誌 共著・分担
The fast development of electric vehicles promoted the development of next-generation power modules. Along with this trend, the encapsulation techniques are also transforming from previous gel encapsulation to epoxy encapsulation because epoxy encapsulation reduces the module size significantly. However, the dissimilar bonding between the epoxy and the metal substrate is a weak part of the entire module. Unlike previous studies, which focused on epoxy properties and thermal stress, we investigated the failure mechanisms between the encapsulation epoxy and the copper substrate under high temperatures by considering the interfacial interaction. A high-temperature storage test (HST) was performed at 200 .DEG.C until 1000 h for encapsulated packages. We then measured the bonding strength and identified the fracture path at the nanoscale by SEM, XPS, and ToF-SIMS depth profiling. In addition, the changes in the epoxy were characterized by ATR-FTIR, nanoindentation, and XPS depth profiling. The bonding interface was analyzed with AFM-IR, SEM, EDS, and STEM. We found that the fracture happened inside the epoxy rather than the copper/epoxy interface. More importantly, we found that copper atoms diffused into the epoxy reaching approximately 100 nm. The diffused copper atoms and the long-time high-temperature heating promoted the epoxy pyrolysis, forming a 100 nm thick weak layer at the epoxy side, which is the key reason for the high-temperature failure. Our study provided a fresh understanding of the failure mechanisms of the bonding between encapsulation epoxy and the copper substrate under HST, which will contribute significantly to future power module design and material development. Copyright 2023 Elsevier B.V., Amsterdam.All rights reserved.
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Sumio Aisawa, Jing Sang, Daisuke Suga, Hidetoshi Hirahara, Eiichi Narita
Applied clay science 226 106575 2022年09月 [査読有り]
学術誌 共著・分担
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Zhixin Kang, Yeqing He, Jing Sang, Hidetoshi Hirahara, Dexin Chen
Advanced materials interfaces 8 ( 17 ) 2100651 2021年08月 [査読有り]
学術誌 共著・分担
Herein, a superhydrophobic and highly conductive cotton fabric (CF) composite with outstanding corrosion resistance for wearable textile electronics is developed. The fabrication process of the fabric composite involves spraying deposition and electrodeposition. Ag nanoparticles (AgNPs) are first synthesized on cotton fibers surface via two components spraying, forming cotton fibers core/AgNPs shell structure. The CF/ AgNPs composite is then covered with a layer of cerium myristate
(CeM) by electrodeposition, which endows the composite with superhydrophobicity and outstanding corrosion resistance. The resistivity of CF/AgNPs/CeM composite could reach as low as 0.106 Ω mm. Moreover, the obtained CF/AgNPs/CeM composite exhibits excellent self-cleaning property and superhydrophobicity with a contact angle
(CA) of 158.4°. Also, it maintains superhydrophobicity (CA > 150°) after 60 cm abrasion test or immersion in strong acidic/alkaline solution
(pH = 1 or 13) for 24 h. In addition, the corrosion current density of conductive fabric composite (CFC) after electrodeposition decreases
to 4.79% of the original value in simulated sweat corrosive media, suggesting a significant improvement of anti-corrosion. The developed superhydrophobic CFC with excellent corrosion resistance and self- cleaning performance has promising applications for wearable electronics in harsh conditions. -
A kinetic analysis of intercalation of organic sulfate anions into layered double hydroxide using quartz crystal microbalance with layered double hydroxide-immobilized electrode
Sumio AISAWA, Jing SANG, Yuya NITANAI, Hidetoshi HIRAHARA, Eiichi NARITA
Journal of the Ceramic Society of Japan 129 ( 7 ) 470 - 477 2021年07月 [査読有り]
学術誌 共著・分担
To investigate a dynamic intercalation behavior of organic anions into layered double hydroxide (LDH) interlayer by ion-exchange, a quartz crystal microbalance (QCM) with the Mg-Al LDH thin film immobilized gold disc (LDH/QC) electrode has been used. A stable minute LDH film was prepared by using translucent aqueous sol of LDH containing OH- ions and magnesium acetate molecule in the interlayer and immobilized on the gold disc after pretreatment of the surface of the supporting silica electrode with hydrophobic agent. In the kinetic analysis, alkyl sulfates having n-alkyl chain (CnH2n+1, n = 5-12; abbreviated as CnS) were used as guest anions. As the results, the time-dependence on CnS intercalation by ion-exchange with guest OH- ions and magnesium acetate molecules was measured in the cases of CnS (n .GEQ. 7), and the data of C11S and C12S intercalation were successively analyzed using the rate equation based on the reversible pseud first-order reaction. Finally, the instrumental analyses of the LDH films before and after the intercalation of C12S revealed that the organic anions could be intercalated into the LDH interlayer of the LDH/QC electrode in each aqueous solutions.
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Interfacial Molecular Motion and Chemical Characteristics of Polymer Jointed to Metal by Chemical Bonding
Xueliang Deng, Jing Sang, Sumio Aisawa, Kastuhito Mori , Hidetoshi Hirahara
Journal of the Japan Society of Colour Material 96 ( 6 ) 149 - 157 2021年06月 [査読有り]
学術誌 共著・分担
シリコンゴムと Al が接触方式による放熱材料の熱伝導性，接着剤による接合での熱伝導性，そし て界面化学結合により創成したシリコンゴムとAl 複合体の化学接合方式による熱伝導特性への影響を評価す ることによって，ヒートシンクと放熱材料，および放熱材料と熱源の界面の接触熱抵抗の影響を解明してい る。シリコンゴムと Al 複合体の熱伝導特性におよぼすシリコンゴム架橋剤添加量とシリコンゴム厚さの影響 について検討した。シリコンゴムと Al の接触方式による熱伝導性と接着剤による接合での熱伝導性，そして 分子接合剤により界面化学結合させたシリコンゴムとAl複合体の化学接合方式によって熱伝導特性が異なるこ とを解明し，化学結合を用いて接合したシリコンゴムとAl複合体放熱材料はシリコンゴムとヒートシンク (Al) 材料の接触熱抵抗の減少に有効であることを明らかにした。
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INTERCALATION BEHAVIOR OF VANILLIN AND RELATED COMPOUNDS INTO Mg–Al LAYERED DOUBLE HYDROXIDE BY CALCINATION–REHYDRATION REACTION IN AQUEOUS SOLUTIONS
Sumio Aisawa, Jing Sang, Ayaka Masubuchi, Hidetoshi Hirahara, Eiichi Narita
Clay Science 24 ( 2-4 ) 47 - 54 2021年02月 [査読有り]
学術誌 共著・分担
The intercalation behavior of vanillin (VL), one of the most famous flavoring components having aldehyde structure, and its related compounds, m-anise aldehyde (MA) and 2- methoxyphenol (MP), into Mg-Al layered double hydroxide (LDH) has been examined by the calcination-rehydration (reconstruction) method using LDH oxide precursor at 25.DEG.C for 24 h. The molar ratio of the organic guest in aqueous solution to Al3+ ion in LDH oxide was set at 1.00 in all the experiments. The solid product was found to incorporate the guest depend on its structure together with hydroxide ion and to show the restorable LDH structure. The amounts of the organic guest intercalated (the guest/Al molar ratio of the solid product) were as follows: VL (0.81)>MP (0.41)>MA (0.18), and the effect of each substituent group of the guests was also discussed. In the case of vanillin isomers, the intercalated amounts were differently in the order; VL (0.81)>ortho-vanillin (0.58)>iso-vanillin (0.35), whereas the intercalated amounts of anise isomers were, on the whole, lower than VL isomers as MA (0.18)>ortho-anise (0.034)>para-anise (0.012). The XRD patterns of the solid products showed that VL was intercalated as a monovalent anion to make bilayer and to keep horizontal orientation for the LDH basal layer, and the others were intercalated to keep parallel orientation in the interlayer. Moreover, the results of the guest deintercalation (release) experiments from the solid products by ion exchange with chloride or carbonate ion revealed that the easier intercalated guest, the more difficult released one from the solid products.
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過酸化物架橋によるアクリロニトリル‐ブタジエンゴム表面の直接官能化
桑静、會澤純雄、村岡宏樹、森邦夫、平原英俊
反応性および機能性ポリマー 146 ( 1 ) 104446 - 104453 2020年01月 [査読有り]
学術誌 共著・分担
ペルオキシド架橋アクリロニトリル‐ブタジエンゴム(NBR)の化学組成、 架橋特性およびフリーラジカル反応に及ぼす各種過酸化物剤の影響について検討した。一次架橋プロセスによる架橋ゴム表面上の官能基の形成を制御する表面改質法としての過酸化物架橋に関する新しい展望を提供した。架橋中に、過酸化物は有用な架橋剤として作用し、ゴム表面上の官能基形成の効率的な制御剤として作用する。アルキル、フェニル及び両基のような過酸化物を含む構造を用いて架橋したNBRの表面官能化をX線光電子分光法(XPS)により調べた。異なる硬化温度の影響も研究した。含酸素官能基を硬化NBR表面上に得た。特に、フェニル基を含む過酸化物によって架橋したNBR表面は、アルキル基を含む過酸化物によって架橋されたものと比較して、酸素含有官能基の存在量の増加を示した。ゴム表面上の官能基形成機構についても考察した。
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分子結合を使用したポリプロピレンとアルミニウムの直接結合と界面ナノスケール特性
桑静、會澤純雄、森邦夫、平原英俊
ACS 応用高分子材料 1 ( 9 ) 2450 - 2459 2019年08月 [査読有り]
学術誌 共著・分担
高精度で高信頼性の接着剤への需要により、直接接着と異なる材料間の界面結合の調査と開発への関心が急速に高まっている。ここでは、トリアジン分子層のグラフト化によるポリマー/金属結合の直接接着方法を検討した。ポリプロピレン（PP）とアルミニウム（Al）がそれぞれ結合ポリマーと金属です。ナノスケールでの表面と界面の特性は、ナノスケール熱分析（ナノTA）と原子間力顕微鏡+ナノスケール赤外分光法（AFMナノIR）によって研究され、結合物質の熱特性と化学構造が評価されました。トリアジン分子剤がプラズマ処理されたPPおよびAlの表面と反応し、表面に共有結合を形成することを明らかにした。 PPとAlの接着界面により、接着温度がPPの表面転移温度を超えると、接着強度がPPの凝集破壊することを明らかにした。樹脂接着結合に対する表面ナノスケール熱特性とAFM-nanoIRスペクトルから共有結合の影響を明らかにしました。この研究の結果は、産業用樹脂の精密接着用途で特に価値がある。
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ポータブル複合X線分析による中世前半期の中国産陶磁器の産地推定に関する研究―福建・浙江産陶磁器の研究を事例に
徳留大輔, 平原英俊, SANG Jing, 田上勇一郎 , LI Jianan, YAN Zeling, SHEN Yueming, 會澤純雄
東洋陶磁 ( 東洋陶磁学会 ) 48 75 - 92 2019年03月 [査読有り]
学術誌 共著・分担
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分子グラフト法によるニッケルめっきのためのA BSプラスチックの表面メタライゼーション
張亨、康志新、桑静、平原英俊
表面およびコーティング技術 340 8 - 16 2018年04月 [査読有り]
学術誌 共著・分担
ABSプラスチックの表面活性化は分子グラフト化及び自己集合からなる新規なパラジウムフリー前処理により成功した。銀ミラー反応は溶液の噴霧によるABSプラスチック上の銀膜を調製するために開発した。分子結合力は通常の活性化法による機械的アンカー効果より大きく基板とAg膜の間の優れた密着性である。ニッケル電気めっき被覆は耐食性を向上させることができた。X線光電子分光法(XPS)分析とX線回折(XRD)の結果から、ABS上の銀膜を明らかにした。走査電子顕微鏡(SEM)とエネルギー分散X線分光法(EDS)を用いて、被覆の形態を明らかにした。
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2成分スピンスプレー堆積法による光グラフト化ポリイミド基板上へのAg/CNT複合膜の合成
張洋、康志新、別所毅、平原英俊、桑静
Journal of Industrial and Engineering Chemistry 56 355 - 363 2017年12月 [査読有り]
学術誌 共著・分担