检索结果-内蒙古大学图书馆

Enhancement of High-Voltage DC Insulation Performance and Mechanical Properties in Polypropylene Nanocomposites with Silane-Coated MgO

引用

Macromolecular Chemistry and Physics 2025年

作者： Kim, Young Nam Kim, Minah Yoon, Somi Kim, Yebom Choi, Yong-Seok Lee, Seung Jun Wie, Jeong Jae Yoon, Ho Gyu Jung, Yong Chae RAMP Convergence Research Center Korea Institute of Science and Technology (KIST) 92 Chudong-ro Bongdong-eup Jeonbuk Wanju-gun 55324 South Korea Department of Materials Science and Engineering Korea University 145 Anam-ro Seoul Seongbuk-gu 02841 South Korea ILJIN Electric Co. Ltd. 905-64 Mannyeon-ro Gyeonggi-do Hwaseong-si 18365 South Korea Department of Organic and Nano Engineering Hanyang University 222 Wangsimni-ro Seoul Seongdong-gu 04763 South Korea Hyunday Engineering Plastic (HDC) 1221-32 Daehoman-ro Seokmun-myeon Chungcheongnam-do Dangin-shi 31703 South Korea Human-Tech Convergence Program Hanyang University 222 Wangsimni-ro Seoul Seongdong-gu South Korea Department of Chemical Engineering State University of New York College of Environmental Science and Forestry 1 Forestry Drive Syracuse 13210 NY United States

In this study, magnesium oxide (MgO) is introduced as an inorganic oxide filler to utilize polypropylene (PP) as an insulating material, and silane (SiO₂) coating is applied to the surface of the nanoparticles to simultaneously improve the insulating properties and mechanical properties in a high-voltage direct current (HVDC) environment. First, MgO particles with an average particle diameter of ≈200–250 nm are surface-modified by silane treatment (MgO@SiO₂) and compounded with PP matrix by biaxial melt compounding process. XPS and FT-IR analysis confirmed the effective silane coating on the surface of MgO particles, while STEM-EDX and XRM analysis visually demonstrated that the coated MgO@SiO₂ is uniformly dispersed inside the PP. In terms of mechanical properties, such as tensile strength, bending strength, and strain at break, the PP/MgO@SiO₂ insulation composites show superior results compared to neat PP and PP/MgO insulation composites, which are attributed to the increased interfacial affinity and improved filler dispersion due to the silane coating. In addition, the PP/MgO@SiO₂ sample exhibits the highest value for direct current breakdown dielectric strength (DCBD), confirming that it can realize stable insulation performance in a high field. © 2025 Wiley-VCH GmbH.

关键词： DCBD HVDC MgO polypropylene silane coated

来源：评论

学校读者我要写书评

暂无评论

Size-controlled human adipose-derived stem cell spheroids hybridized with singlesegmented nanofibers and their effect on viability and stem cell differentiation

引用

BIOMATERIALS RESEARCH 2021年第1期25卷 1页

作者： Lee, Jinkyu Lee, Sangmin Kim, Sung Min Shin, Heungsoo Hanyang Univ Dept Bioengn Seoul 04763 South Korea Hanyang Univ Human Tech Convergence Program BK21 4 Seoul 04763 South Korea Hanyang Univ Educ & Res Grp Biopharmaceut Innovat Leader BK21 4 Seoul 04763 South Korea Hanyang Univ Dept Phys Educ & Act Aging Ind Seoul 04763 South Korea Hanyang Univ Ctr Artificial Intelligence Muscle Seoul 04763 South Korea Hanyang Univ Inst Nano Sci & Technol Seoul 04763 South Korea

Background: Fabrication of three-dimensional stem cell spheroids have been studied to improve stem cell function, but the hypoxic core and limited penetration of nutrients and signaling cues to the interior of the spheroid were challenges. The incorporation of polymers such as silica and gelatin in spheroids resulted in relatively relaxed assembly of composite spheroids, and enhancing transport of nutrient and biological gas. However, because of the low surface area between cells and since the polymers were heterogeneously distributed throughout the spheroid, these polymers cannot increase the cell to extracellular matrix interactions needed to support differentiation. Methods: We developed the stem cell spheroids that incorporate poly(iota-lactic acid) single-segmented fibers synthesized by electrospinning and physical and chemical fragmentation. The proper mixing ratio was 2000 cells/ mu g fibers (average length of the fibers was 50 mu m - 100 mu m). The SFs were coated with polydopamine to increase cell binding affinity and to synthesize various-sized spheroids. The function of spheroids was investigated by in vitro analysis depending on their sizes. For statistical analysis, Graphpad Prism 5 software (San Diego, CA, USA) was used to perform one-way analysis of variance ANOVA with Tukey's honest significant difference test and a Student's t-test (for two variables) (P < 0.05). Results: Spheroids of different sizes were created by modulating the amount of cells and fibers (0.063mm(2)-0.322 mm(2)). The fibers in the spheroid were homogenously distributed and increased cell viability, while cell-only spheroids showed a loss of DNA contents, internal degradation, and many apoptotic signals. Furthermore, we investigated stemness and various functions of various-sized fiber-incorporated spheroids. In conclusion, the spheroid with the largest size showed the greatest release of angiogenic factors (released VEGF: 0.111 +/- 0.004 pg/ng DNA), while the smallest size showed

关键词： Single segmented fibers Spheroid Stem cell Angiogenic factor Differentiation

来源：评论

学校读者我要写书评

暂无评论

Investigation of Cu2SnS3 nanoparticles decorated g-C3N4 nanocomposites for high performance battery-type hybrid supercapacitors

引用

JOURNAL OF ENERGY STORAGE 2024年 102卷

作者： Muthu, Senthilkumar Preethi, V. Raja Johny, Joyal Subalakshmi, K. Sridharan, Moorthy Babu Lee, Kyu-Tae Park, Hui Joon Hanyang Univ Dept Organ & Nano Engn Seoul 04763 South Korea Hanyang Univ Human Tech Convergence Program Seoul 04763 South Korea Hanyang Univ Hanyang Inst Smart Semicond Seoul 04763 South Korea Indian Inst Technol Madras Dept Chem Chennai 600036 Tamilnadu India Jozef Stefan Inst Adv Mat Dept Jamova cesta 39 Ljubljana Slovenia Dongguk Univ Seoul Dept Semicond Sci Seoul 04620 South Korea Anna Univ Crystal Growth Ctr Chennai 600025 Tamilnadu India Inha Univ Dept Phys Inchon 22212 South Korea

The hybrid-type of supercapacitors based on transition metal sulfides-carbon composite electrodes are found to be a prominent and emerging technological advancement with beneficial characteristics such as a larger surface area, high durability, and a unique charge storage mechanism. In this work, phase pure copper tin sulfide (Cu2SnS3/CTS) nanoparticles (NPs) and the nanocomposite of CTS NPs decorated graphitic carbon nitride (gC3N4) CTS-gCN were prepared by an inexpensive solvothermal approach. The CTS-gCN nanocomposite-based supercapacitors show a high specific capacitance of 477 F/g at 1 A g- 1 current density, which is much higher than the pristine CTS NPs based supercapacitors (362 F/g) in three electrode configurations. The asymmetric hybrid supercapacitors were prepared with CTS-gCN electrodes and reduced graphene oxide (rGO) as a negative electrode with potassium hydroxide (KOH) as an electrolyte. The electrochemical characteristics of asymmetric CTS-gCN//rGO supercapacitors exhibit battery-like behavior with a specific capacitance of 108 F/g at the scan rate of 1 A g- 1 with a high energy density of 42 W h kg- 1 and a power density of 835.4 W kg- 1. The CTS-gCN// rGO supercapacitors show excellent capacitance retention over 94 % even after 2000 cycles. The obtained electrochemical results of the supercapacitors with high energy density, power density, wider potential window, and cyclic stability suggest the CTS-gCN//rGO hybrid supercapacitors as a promising candidate for emerging electrochemical energy storage technologies.

关键词： Hybrid supercapacitors Battery-like supercapacitors High cyclic stability Cu2SnS3 nanoparticles

来源：评论

学校读者我要写书评

暂无评论

Highly Efficient Bifacial Color-Tunable Perovskite Solar Cells

引用

ADVANCED OPTICAL MATERIALS 2022年第2期10卷

作者： Heo, Jihyeon Jung, Incheol Park, Hyunwoo Han, Ju Hwan Kim, Hyeonwoo Park, Hansol Park, Jin-Seong Jeon, Hyeongtag Lee, Kyu-Tae Park, Hui Joon Hanyang Univ Dept Organ & Nano Engn Seoul 04763 South Korea Hanyang Univ Human Tech Convergence Program Seoul 04763 South Korea Inha Univ Dept Phys Incheon 22212 South Korea Hanyang Univ Div Mat Sci & Engn Seoul 04763 South Korea

Solar cells with a visually aesthetic functionality are of great importance for their smooth integration with indoor and outdoor spaces in buildings and automobiles, and portable electronic devices. Here bidirectional, colorful perovskite solar cells with high efficiency based on optical interference effects within the multilayer solar cell structure are presented. Tunable reflective colors across the whole visible region can be achieved by simply tuning the thickness of a transparent electrode of the solar cell. Same or different colors from top- and bottom-sides can be easily attained by properly selecting the thickness of the transparent electrode. Absorbing a substantial fraction of the visible region of solar radiation allows the colored perovskite solar cells to accomplish high power conversion efficiencies of 16.01% and 17.68% when illuminated from the top- and bottom-sides, respectively, while the reflective colors are produced by using a small proportion of the visible solar spectrum. The described scheme opens a variety of potential applications, such as power-generating surfaces for buildings and automobiles, energy-efficient display systems, and self-powered wearable electronics.

关键词： bifacial solar cells color-tunable solar cells perovskite solar cells

来源：评论

学校读者我要写书评

暂无评论

Structure-Performance Relationship of Aromatic Polymer Binder for Silicon Anode in Lithium-Ion Batteries

引用

ADVANCED FUNCTIONAL MATERIALS 2023年第44期33卷

作者： Kim, Junho Kim, Gyuri Park, You Kyung Lim, Gayoung Kim, Seung Tae Jung, In Hwan Kim, Hansu Hanyang Univ Dept Energy Engn 222 Wangsimni Ro Seoul 04763 South Korea Hanyang Univ Dept Organ & Nano Engn 222 Wangsimni Ro Seoul 04763 South Korea Hanyang Univ Human Tech Convergence Program 222 Wangsimni Ro Seoul 04763 South Korea

Polymer binders are essential for Silicon (Si) anode-based lithium-ion batteries (LIBs). However, the synthetic guidance for aromatic polymer binder is relatively less explored compared to aliphatic polymer binders. In this study, polyimide-based aromatic polymer binders are developed that have strong binding affinity with Si particles, a conductive agent and copper (Cu) current collector, and they show an improved initial discharge capacity of 2663 mAh g(-1), which is 29% higher than that of Kapton-based one (2071 mAh g(-1)). The copolymerization between "hard" and "soft" segments is crucial to achieve reversible volume expansion/contraction during the repeated charging/discharging process, resulting in the best cycle performance. The new binder ensures both excellent volume retention after full-delithiation and allowed volume expansion at least to some extent upon full-lithiation. This Study finds a power-law relationship between the capacity of Si anode and the mechanical properties of the binder, i.e., the tensile stress (& sigma;) and strain (e). The initial discharge capacity is proportional to & sigma;(n) & BULL;e (n = 2.3-2.7). Such an understanding of the relationships between polymer structure, mechanical properties of the polymer and binder performance clearly revealed the importance of the soft-hard polymer structure for aromatic binders used in Si-based high-capacity lithium storage materials.

关键词： Li-ion batteries polymer binders silicon anodes soft-hard copolymers tensile stress-strain relationship

来源：评论

学校读者我要写书评

暂无评论

Highly Stable Heating Fibers of Ti3C2Tx MXene and Polyacrylonitrile via Synergistic Thermal Annealing

引用

SMALL METHODS 2024年第12期8卷 e2400199页

作者： Jeong, Woojae Shin, Hwansoo Kang, Dong Jun Jeon, Hongchan Seo, Jaesik Han, Tae Hee Hanyang Univ Dept Organ & Nano Engn Human Tech Convergence Program Seoul 04763 South Korea Hanyang Univ Res Inst Ind Sci Seoul 04763 South Korea Hyundai Motor Co Mat Res & Engn Ctr Sustainable Mat Res Team Uiwang 16082 South Korea

Nanohybrid assemblies provide an effective platform for integrating the intrinsic properties of individual components into microscale fibers. In this study, a novel approach for creating mechanically and environmentally stable MXene fibers through the synergistic assembly of MXene and polyacrylonitrile (PAN), is introduced. Unlike fibers generated via a conventional stabilization process, which relies on air-based stabilization to transform the PAN molecules into ring structures fundamental to carbon fibers, the hybrid fibers are annealed in an Ar atmosphere. This unique approach suggests MXene can serve as an oxygen provider that is essential for stabilizing PAN. As a result, significantly improved interfiber compactness is achieved and the oxidation stability of MXene is enhanced under atmospheric conditions. The resulting fibers exhibit exceptional stability, even after extended exposure to high humidity and elevated temperatures. This highlights the suitability of the thermally annealed MXene-PAN (T-MX-PAN) fibers as robust electric heating elements. Notably, these fibers consistently generate heat over 1800 bending cycles. When integrated into fabrics, they demonstrate the capability to generate sufficient heat for melting ice and rapid evaporation. This study highlights the potential of T-MX-PAN fibers as next-generation wearable heaters and offers valuable insights into advancing wearable technology in demanding environments.

关键词： fibers MXene polyacrylonitrile stabilization wearable heater

来源：评论

学校读者我要写书评

暂无评论

Photocrosslinkable Zwitterionic Ligands for Perovskite Nanocrystals: Self-Assembly and High-Resolution Direct Patterning

引用

ADVANCED FUNCTIONAL MATERIALS 2023年第41期33卷

作者： Noh, Sung Hoon Jeong, WonJo Lee, Kyeong Ho Yang, Han Sol Suh, Eui Hyun Jung, Jaemin Park, Seul Chan Lee, Dongwoon Jung, In Hwan Jeong, Yong Jin Jang, Jaeyoung Hanyang Univ Dept Energy Engn Seoul 04763 South Korea Hanyang Univ Dept Organ & Nano Engn Seoul 04763 South Korea Hanyang Univ Human Tech Convergence Program Seoul 04763 South Korea Korea Natl Univ Transportat Dept Mat Sci & Engn Chungju 27469 South Korea

Perovskite nanocrystals (PNCs) are attractive photoactive materials in various optoelectronic devices including light-emitting diodes, solar cells, and photodetectors. However, the weakly bound surface ligands on PNCs reduce colloidal stability and cause film formation and patterning difficulties, severely restricting their practical applications. Herein, a rationally designed photocrosslinkable zwitterionic (PZ) ligand is introduced to obtain directly patternable CsPbBr3 PNCs with enhanced colloidal stability, optical properties, and self-assembly propensity. The PZ ligands strongly interact with the pre-synthesized PNCs in solution, substantially replacing the original capping ligands and effectively passivating surface defects. This surface engineering induces strong electrostatic interactions between the PNCs, enabling the fabrication of densely packed CsPbBr3 PNC films. Furthermore, the methacrylate group of the PZ ligands serves as a bridge for active radical propagation in the ligand shells around the PNCs upon UV exposure. Accordingly, high-resolution direct photopatterning can be achieved through ligand crosslinking, and the resulting PNC patterns (minimum line spacing of 4 mu m) maintain optical stability for over 2 weeks. Therefore, this study demonstrates that a tailored ligand design strategy enables the simultaneous achievement of high colloidal stability, optical properties, photopatternability, and self-assembly propensity and has considerable potential to be extended to other PNC materials.

关键词： CsPbBr3 perovskite nanocrystals direct photopatterning ligand shells self-assembly zwitterionic ligands

来源：评论

学校读者我要写书评

暂无评论

Efficient and scalable encapsulation process of highly conductive 1T-MoS2 nanosheets on Ni-rich LiNi0.83Co0.11Mn0.06O2 cathode materials for high-performance lithium-ion batteries

引用

CHEMICAL ENGINEERING JOURNAL 2023年第1期470卷

作者： Lee, Sanghyun Hwang, Jeonguk Park, Changyong Ahn, Suhyun Do, Kwanghyun Kim, Sungwook Ahn, Heejoon Hanyang Univ Dept Organ & Nano Engn Human Tech Convergence Program 222 Wangsimni Ro Seoul 04763 South Korea Hanyang Univ Dept Battery Engn 222 Wangsimni Ro Seoul 04763 South Korea Hanyang Univ Inst Nano Sci & Technol 222 Wangsimni Ro Seoul 04763 South Korea

Ni-rich LiNi1-x-yCoxMnyO2 (NCM) is an attractive cathode material that can meet the growing global demand of the Lithium-ion battery market owing to its high energy density and low cost. However, it still suffers from cyclic and thermal instability due to several issues, such as structural deterioration and excessive cathode electrolyte interface (CEI) layer formation arising from side reactions occurring at the NCM particle surface. In this study, molybdenum disulfide (MoS2) nanosheets with a metallic 1T phase are synthesized by chemical exfoliation, functionalized with polyethyleneimine (PEI), and uniformly coated on the surface of Ni-rich NCM particles through electrostatic interactions. As a result, the ceMoS2-PEI layer effectively alleviates the electrochemical performance degradation of NCM caused by irreversible phase transitions, microcrack formation, transition metal dissolution, and thick CEI layer formation by suppressing side reactions due to direct contact with the organic electrolyte or hydrofluoric acid on the surface of NCM. In addition, the ceMoS2-PEI layer provides a sufficient transport pathway for charge transfer and Li+ ion diffusion, thereby mitigating electrode polarization and impedance increase. Consequently, NCM/ceMoS2-PEI electrodes exhibit a high discharge capacity of 150.6 mAh g+1 at 5C and outstanding capacity retention of 96.9 % after 100 cycles at 1C. Moreover, further cycle tests in harsh environments, such as high mass loading and operating temperature, demonstrate that the ceMoS2-PEI layer coating more effectively improves the structural and thermal stability of the Ni-rich NCM in harsh environments.

关键词： Lithium -ion batteries Ni-rich layered cathode Nanosheet coating Molybdenum disulfide nanosheets Electrostatic attraction

来源：评论

学校读者我要写书评

暂无评论

Experimental and theoretical studies on cobalt ruthenium phosphate structure optimization towards supercapacitor application

引用

MATERIALS TODAY CHEMISTRY 2024年 38卷

作者： Joshi, Ved Prakash Kumar, Nitish Yadav, Radhey Shyam Pathak, Prakash Kumar Agrim, Kavya Prakash Kornweitz, Haya Ahn, Heejoon Salunkhe, Rahul R. Indian Inst Technol Jammu Dept Phys Mat Res Lab NH-44 Jammu 181221 Jammu & Kashmir India Ariel Univ Dept Chem Sci IL-40700 Ariel Israel Hanyang Univ Dept Organ & Nano Engn Human Tech Convergence Program 222 Wangsimni Ro Seoul 04763 South Korea

Recent studies have given indications that nanoarchitectured binary transition metal phosphates can act as potential supercapacitor (SC) electrode materials due to their exceptional energy storage capacity and remarkable electrochemical stability. However, the highly amorphous nature or broad X-ray diffraction peaks of metal phosphates put a limit on the structural optimization of these materials. We demonstrate a combined experimental and theoretical study leading to an optimized cobalt-ruthenium phosphate (CRP) structure for highperformance SC application. The material structure was optimized by detailed density functional theory (DFT) calculations, including the Bader charge analysis, DOS, and PDOS, revealed the lattice and volume expansion, reduced band gap, and improved conductivity of the cobalt phosphate lattice by including ruthenium in the cobalt phosphate. These predictions are verified with experimental band gap and high-resolution transmission electron microscope plane image indexing. Further, the CRP was developed by potentiostatic deposition onto the carbon cloth substrate. The flexible CRP electrode exhibited a high specific capacitance of 1258 F g-1 (943.5C g-1) in the aqueous 2 M KOH electrolyte. The asymmetric SC device (CRP//activated carbon) has exhibited an excellent specific energy of -59 Wh kg-1 at a specific power of -751 W kg-1.

关键词： Cobalt ruthenium phosphate Transition metal phosphate Density functional theory Electronic structure Supercapacitors

来源：评论

学校读者我要写书评

暂无评论

programming Anisotropic Functionality of 3D Microdenticles by Staggered-Overlapped and Multilayered Microarchitectures

引用

ADVANCED MATERIALS 2024年第7期36卷 2309518-2309518页

作者： Park, Jeong Eun Je, Hyeongmin Kim, Chae Ryean Park, Sudong Yu, Yeonuk Cho, Woongbi Won, Sukyoung Kang, Dong Jun Han, Tae Hee Kwak, Rhokyun Lee, Seung Goo Kim, Sanha Wie, Jeong Jae Hanyang Univ Res Inst Ind Sci Dept Organ & Nano Engn Seoul 04763 South Korea Korea Adv Inst Sci & Technol Dept Mech Engn Daejeon 34141 South Korea Univ Ulsan Dept Chem Ulsan 44610 South Korea Hanyang Univ Dept Mech Convergence Engn Seoul 04763 South Korea Hanyang Univ Dept Organ & Nano Engn Human Tech Convergence Program Seoul 04763 South Korea Hanyang Univ Inst Nano Sci & Technol Dept Mech Convergence Engn Seoul 04763 South Korea Hanyang Univ Inst Nano Sci & Technol Dept Chem Engn Dept Organ & Nano EngnHuman Tech Convergence Prog Seoul 04763 South Korea SUNY Michael M Szwarc Polymer Res Inst Dept Chem Engn Coll Environm Sci & Forestry Syracuse NY 13210 USA

Natural sharkskin features staggered-overlapped and multilayered architectures of riblet-textured anisotropic microdenticles, exhibiting drag reduction and providing a flexible yet strong armor. However, the artificial fabrication of three-dimensional (3D) sharkskin with these unique functionalities and mechanical integrity is a challenge using conventional techniques. In this study, it is reported on the facile microfabrication of multilayered 3D sharkskin through the magnetic actuation of polymeric composites and subsequent chemical shape fixation by casting thin polymeric films. The fabricated hydrophobic sharkskin, with geometric symmetry breaking, achieves anisotropic drag reduction in frontal and backward flow directions against the riblet-textured microdenticles. For mechanical integrity, hard-on-soft multilayered mechanical properties are realized by coating the polymeric sharkskin with thin layers of zinc oxide and platinum, which have higher hardness and recovery behaviors than the polymer. This multilayered hard-on-soft sharkskin exhibits friction anisotropy, mechanical robustness, and structural recovery. Furthermore, coating the MXene nanosheets provides the fabricated sharkskin with a low electrical resistance of approximate to 5.3 omega, which leads to high Joule heating (approximate to 229.9 degrees C at 2.75 V). The proposed magnetomechanical actuation-assisted microfabrication strategy is expected to facilitate the development of devices requiring multifunctional microtextures. To mimic natural sharkskin exhibiting drag reduction and providing a flexible yet strong armor, microfabrication of multilayered 3D sharkskin comprising polymeric composites is suggested. 3D artificial sharkskin has staggered-overlapped and multilayered architectures with riblet-textured microdenticles which exhibit programmed anisotropic multifunction including drag reduction anisotropy, friction anisotropy, mechanical robustness, structural recovery, and Joule heating with

关键词： biomimetics drag reduction electrical conductivity friction indentation MXene sharkskin

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：