共查询到20条相似文献，搜索用时 15 毫秒
1.
M. V. Peralta-Martinez M. J. Assael M. J. Dix L. Karagiannidis W. A. Wakeham 《International Journal of Thermophysics》2006,27(3):681-698
New measurements of the thermal conductivity of molten mercury, gallium, tin, and indium are reported up to 750 K. The measurements are performed in a novel transient hot-wire instrument described elsewhere. The present experimental technique overcomes problems of convection, and it is shown that it operates in an absolute way in accord with a theoretical model. The uncertainty of the thermal conductivity results is estimated to be ± 2%, which is superior to that achieved in most earlier work. The low uncertainty of the present experimental results has allowed us to test the only significant theory for the thermal conductivity of molten metals, which relates this property to the electrical conductivity. The pattern of results among the four metals indicates that further theoretical developments would be warranted. 相似文献
2.
In Ho Kim Taeyeong Yun Jae‐Eun Kim Hayoung Yu Suchithra Padmajan Sasikala Kyung Eun Lee Sung Hwan Koo Hoseong Hwang Hong Ju Jung Jeong Young Park Hyeon Su Jeong Sang Ouk Kim 《Advanced materials (Deerfield Beach, Fla.)》2018,30(40)
Inspired by mussel adhesive polydopamine (PDA), effective reinforcement of graphene‐based liquid crystalline fibers to attain high mechanical and electrical properties simultaneously is presented. The two‐step defect engineering, relying on bioinspired surface polymerization and subsequent solution infiltration of PDA, addresses the intrinsic limitation of graphene fibers arising from the folding and wrinkling of graphene layers during the fiber‐spinning process. For a clear understanding of the mechanism of PDA‐induced defect engineering, interfacial adhesion between graphene oxide sheets is straightforwardly analyzed by the atomic force microscopy pull‐off test. Subsequently, PDA could be converted into an N‐doped graphitic layer within the fiber structure by a mild thermal treatment such that mechanically strong fibers could be obtained without sacrificing electrical conductivity. Bioinspired graphene‐based fiber holds great promise for a wide range of applications, including flexible electronics, multifunctional textiles, and wearable sensors. 相似文献
3.
Graphene Fibers: Mussel‐Inspired Defect Engineering of Graphene Liquid Crystalline Fibers for Synergistic Enhancement of Mechanical Strength and Electrical Conductivity (Adv. Mater. 40/2018) 
下载免费PDF全文
下载免费PDF全文 In Ho Kim Taeyeong Yun Jae‐Eun Kim Hayoung Yu Suchithra Padmajan Sasikala Kyung Eun Lee Sung Hwan Koo Hoseong Hwang Hong Ju Jung Jeong Young Park Hyeon Su Jeong Sang Ouk Kim 《Advanced materials (Deerfield Beach, Fla.)》2018,30(40)
4.
Miao Zhang Yanlei Wang Liang Huang Zhiping Xu Chun Li Gaoquan Shi 《Advanced materials (Deerfield Beach, Fla.)》2015,27(42):6708-6713
5.
Afsaneh L. Sanati;Timur Nikitin;Rui Fausto;Carmel Majidi;Mahmoud Tavakoli; 《Advanced Materials Technologies》2024,9(14):2301428
Energy storage devices with liquid-metal electrodes have attracted interest in recent years due to their potential for mechanical resilience, self-healing, dendrite-free operation, and fast reaction kinetics. Gallium alloys like Eutectic Gallium Indium (EGaIn) are appealing due to their low melting point and high theoretical specific capacity. However, EGaIn electrodes are unstable in highly alkaline electrolytes due to Gallium oxide dissolution. In this letter, this bottleneck is addressed by introducing chemically stable films in which nanoscale droplets of EGaIn are coated with trace amounts of graphene oxide (GO). It is demonstrated that a GO to EGaIn weight ratio as low as 0.01 provides enough protection for a thin film formed by GO@EGaIn nanocomposite against significantly acidic or alkaline environments (pH 1-14). It is shown that GO coating significantly enhances the surface stability in such environments, thus improving the energy storage capacity by over 10x. Microstructural analysis confirms GO@EGaIn composite stability and enhanced electrochemical performance. Utilizing this, a thin-film supercapacitor is fabricated. Results indicate that when coating the EGaIn with GO to EGaIn ratio of 0.001, the areal capacitance improves by 10 times, reaching 20.02 mF cm−2. This breakthrough paves the way for advanced liquid metal-based thin-film electrodes, promising significant improvements in energy storage applications. 相似文献
6.
Md Abdul Kaium Khan;Yaoli Zhao;Shreyan Datta;Puspita Paul;Shoaib Vasini;Thomas Thundat;Peter Q. Liu; 《Small (Weinheim an der Bergstrasse, Germany)》2024,20(50):2403722
Gallium-based liquid metals (LMs) are widely used for stretchable and reconfigurable electronics thanks to their fluidic nature and excellent conductivity. These LMs possess attractive optical properties for photonics applications as well. However, due to the high surface tension of the LMs, it is challenging to form LM nanostructures with arbitrary shapes using conventional nanofabrication techniques. As a result, LM-based nanophotonics has not been extensively explored. Here, a simple yet effective technique is demonstrated to deterministically fabricate LM nanopatterns with high yield over a large area. This technique demonstrates for the first time the capability to fabricate LM nanophotonic structures of various precisely defined shapes and sizes using two different LMs, that is, liquid gallium and liquid eutectic gallium–indium alloy. High-density arrays of LM nanopatterns with critical feature sizes down to ≈100 nm and inter-pattern spacings down to ≈100 nm are achieved, corresponding to the highest resolution of any LM fabrication technique developed to date. Additionally, the LM nanopatterns demonstrate excellent long-term stability under ambient conditions. This work paves the way toward further development of a wide range of LM nanophotonics technologies and applications. 相似文献
7.
采用液相共混与两次模压方法制备了热塑性聚氨酯弹性体(TPU)/石墨烯纳米片(GN)薄膜,探究了不同GN含量对TPU/GN薄膜力学性能、导热性能和热稳定性的影响.结果表明,当添加质量分数为2.0％GN时,TPU/GN薄膜的拉伸强度和弹性模量分别为60.8 MPa和10.4 MPa,相比纯TPU薄膜分别增长34％和96％;... 相似文献
8.
In-Hwan Choi 《Thin solid films》2011,519(13):4390-4393
Metal organic vapor deposition (MOCVD) is a well known method for preparing high quality and large area CuIn1 − xGaxSe2 (CIGS) absorber layers. Some in-situ non-contact monitoring systems are needed when CIGS absorber layers are manufactured in industry. In this study, CuInSe2 (CIS) and CIGS thin films with different composition ratios, [Cu]/[In + Ga], were prepared by MOCVD using [Me2In(μ-SeMe)]2, hexafluoroacetylacetonate Cu(I) (3,3-dimethyl-1-butene), trimethyl gallium and dimethyle diselenide as the In-Se single source, Cu, Ga and Se precursors, respectively. The Raman shift spectra of the films with various composition ratios were analyzed to produce a basic algorithm that can determine the composition ratios of CIS and CIGS thin films indirectly. 相似文献
9.
三维网状石墨烯/环氧树脂热界面复合材料由于具有良好的热导性能和力学性能,而被广泛应用于微电子器件领域。但是通过化学剥离-还原法制备石墨烯,在填加石墨烯质量分数相同的条件下,石墨烯/环氧树脂热界面复合材料的热导率差别仍然很大。研究发现这主要是由于石墨烯表面官能团含量不同所导致的,因此很难建立统一的标准评估石墨烯作为导热填料的作用效果。为了避免表面官能团对石墨烯/环氧树脂复合物热导率的影响,本研究小组采用化学气相沉积法制备的三维网状石墨烯作为导热填料,对环氧树脂进行修饰,制备了一系列石墨烯/环氧树脂材料。通过研究三维网状石墨烯含量对石墨烯/环氧树脂材料热导率、力学性能及热导率在高温条件下稳定性的影响,有助于完善石墨烯修饰的环氧树脂热界面复合材料的研究,并建立石墨烯作为导热填料的评价体系。 相似文献
10.
Yeye Wen Mingmao Wu Miao Zhang Chun Li Gaoquan Shi 《Advanced materials (Deerfield Beach, Fla.)》2017,29(41)
Nacre‐like graphene films are prepared by evaporation‐induced assembly of graphene oxide dispersions containing small amounts of cellulose nanocrystal (CNC), followed by chemical reduction with hydroiodic acid. CNC induces the formation of wrinkles on graphene sheets, greatly enhancing the mechanical properties of the resultant graphene films. The graphene films deliver an ultrahigh tensile strength of 765 ± 43 MPa (up to 800 MPa in some cases), a large failure strain of 6.22 ± 0.19%, and a superior toughness of 15.64 ± 2.20 MJ m?3, as well as a high electrical conductivity of 1105 ± 17 S cm?1. They have a great potential for applications in flexible electronics because of their combined excellent mechanical and electrical properties. 相似文献
11.
Jiayi Wang Liyan Zhu Jie Chen Baowen Li John T. L. Thong 《Advanced materials (Deerfield Beach, Fla.)》2013,25(47):6884-6888
12.
使用石墨烯为原料,羧甲基纤维素钠(CMC)为增韧剂和优化成膜压力等工艺参数制备具有较高力学性能和导电性能的石墨烯纸薄膜,经表面切口和择向牵拉得到三维伸展的拉花式石墨烯纸网络结构,再通过高流动性水泥浆体的浇注、密实和凝结硬化制备出石墨烯拉花改性水泥基复合材料。用动态热机械分析仪(DMA Q800)测试石墨烯纸薄膜的力学性能,用四探针测试仪(RTS-8型)测试其电学性能,用Keithley 2400数字源表测试复合材料在一定压力下的电阻,研究了这种复合材料的压敏性能。结果表明,CMC掺量为50%、成膜压力为12.5 MPa的石墨烯纸薄膜其力学强度和导电能力较好,制备出的石墨烯拉花改性水泥基复合材料具有一定的压敏性能,即使在电阻循环变化率为10.29%的条件下其压敏性能仍具有良好的重复性。 相似文献
13.
Jeong‐Hwan Park Jun‐Yeob Lee Mun‐Do Park Jung‐Hong Min Je‐Sung Lee Xu Yang Seokjin Kang Sang‐Jo Kim Woo‐Lim Jeong Hiroshi Amano Dong‐Seon Lee 《Advanced Materials Interfaces》2019,6(18)
Graphene has been adopted in III−V material growth since it can reduce the threading dislocations and the III−V epilayer can easily be separated from the substrate due to the weak chemical bond. However, depending on the substrate supporting the graphene, some substrates decompose in the III−V material growth environment, which results in the problem that no graphene remains. In this study, the influence of temperature‐dependent substrate decomposition on graphene through an annealing process that resembles conventional growth conditions in metal–organic chemical vapor deposition (MOCVD) is investigated. It is also confirmed that trimethylgallium, hydrogen, and ammonia gases do not directly affect the graphene loss through gallium nitride (GaN) growth on a graphene/sapphire. In addition, GaN grown on graphene/sapphire could separate, but GaN grown on a graphene/GaN template could not be separated due to GaN template decomposition and related graphene damage. Through further investigation for graphene/gallium arsenide, it is deduced that the gallium generated by substrate decomposition does not play a major role in damage to the graphene but instead the nitrogen generated by substrate decomposition is closely related to it. These results suggest that it is very important to adopt a decomposition‐free substrate that do not damage graphene during GaN growth in MOCVD. 相似文献
14.
15.
16.
Yi C Kim TH Jiao W Yang Y Lazarides A Hingerl K Bruno G Brown A Losurdo M 《Small (Weinheim an der Bergstrasse, Germany)》2012,8(17):2721-2730
Graphene is emerging as a promising material for plasmonics applications due to its strong light-matter interactions, most of which are theoretically predicted but not yet experimentally realized. Therefore, the integration of plasmonic nanoparticles to create metal nanoparticle/graphene composites enables numerous phenomena important for a range of applications from photonics to catalysis. For these applications it is important to articulate the coupling of photon-based excitations such as the interaction between plasmons in each of the material components, as well as their charge-based interactions dependent upon the energy alignment at the metal/graphene interface. These coupled phenomena underpin an active application area in graphene-based composites due to nanoparticle-dependent surface-enhanced Raman scattering (SERS) of graphene phonon modes. This study reveals the coupling of a graphene/SiC support with Ga-nanoparticle-localized surface plasmon resonance, which is of particular interest due to its ability to be tuned across the UV into the near-IR region. This work is the first demonstration of the evolving plasmon resonance on graphene during the synthesis of surface-supported metal nanoparticles, thus providing evidence for the theoretically predicted screening revealed by a damped resonance with little energy shift. Therefore, the role of the graphene/substrate heterojunction in tailoring the plasmon resonance for nanoplasmonic applications is shown. Additionally, the coupled phenomena between the graphene-Ga plasmon properties, charge transfer, and SERS of graphene vibrational modes are explored. 相似文献
17.
18.
The small strain characteristics of the traditional flexible conductive composites hinder their realization of skin-like properties and multi-scenario applications. The value of liquid metal (LM)-based elastomers is demonstrated in flexible electronics. Attempts in this area include the development of multifunctional LM-based elastomers with controllable morphology, superior mechanical performances, and excellent stability. In this work, an efficient strategy is proposed to achieve the fast preparation of the LM patch by uniformly distributing eutectic gallium–indium–tin alloy in deionized water and by constructing the LM-iron particles-Ecoflex (LMIE) ternary composite system. In this study, the fabricated LMIE large strain sensor exhibits high sensitivity (the gage factor (GF) = 0.98 when strain ranges from 0% to 60%; GF = 1.91 when strain ranges from 60% to 100%), high linearity (correlation coefficient (R2) = 0.96 when strain ranges from 0% to 60%; R2 = 0.99 when strain ranges from 60% to 100%), a wide strain range of detection (e.g., 1%–100%) and breaking elongation (e.g., 450%), a fast response time (80 ms), excellent repeatability and stability. This work exhibits the excellent potential of multifunctional liquid metal composites in wearable electronics and prediction devices of structural collapse. 相似文献
19.
为了研究粉末冶金工艺和石墨烯对纯铝力学性能和耐腐蚀性能的影响,以铝粉和氧化石墨烯粉末为原材料,采用粉末冶金工艺,制备了石墨烯铝基复合材料杆材和粉末冶金纯铝杆材,并采用相同挤压工艺获得了熔融铸造纯铝杆材,开展了3种材料的力学性能、电学性能和中性盐雾腐蚀性能研究。利用金相显微镜(OM)、扫描电子显微镜(SEM)、透射电镜(TEM)、能谱(EDS)和重量变化等手段分析了3种材料的微观组织与腐蚀产物。结果表明,粉末冶金工艺能将纯铝材料的拉伸强度提高17.2%,同时保持电阻率几乎不变;0.5%含量石墨烯可使纯铝拉伸强度提高42.5%,且电阻率仅增大1.4%。在中性盐雾环境下,铸造纯铝的腐蚀速率略高于粉末冶金纯铝,石墨烯铝基复合材料和粉末冶金纯铝的腐蚀速率相当。石墨烯可有效提高纯铝力学性能,同时不明显降低其电阻率和耐腐蚀性能。 相似文献