JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Jianfeng Li,Wei Cao,Jinjin Li,Ming Ma
Hypothesis Achievement of superlubricity is an effective method to reduce friction and wear, which has a prominent influence on the operational efficiency and lifetime of a device. However, some burning issues still remain to be solved for the practical applications of superlubricity, such as the poor load-bearing capacity, especially in liquid superlubricity. Therefore, exploring an effective method to enhance the superlubricity performance is essential to accelerate the application of superlubricity. Experiments The friction properties between two different self-assembled monolayers (SAMs)—a perfluorocarbon SAM and a hydrocarbon SAM—and graphite in water were explored and compared by atomic force microscopy (AFM). Findings Enhanced superlubricity performance due to the fluorination was observed. Specifically, we observed an approximately 85% reduction of the friction coefficient after fluorination, and superlubricity was achieved with extremely low friction coefficient of 0.0003. Moreover, 2.4-fold greater load-bearing capacity of the superlubricity was obtained after fluorination. The molecular origin of the superlubricity enhancement by fluorination was revealed by molecular dynamics (MD) simulations, indicating that the greater load-bearing capacity of the perfluorocarbon SAM was ascribed to the enhanced interaction between the water and SAM by fluorination to form a more robust layered water structure confined in the contact zone, which played a pivotal role in the superlubricity.
研究领域:
材料科学
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表面科学
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DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·Vol. 34
·期 37
·2402276
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IF 18.5
Xiu He,Xirui Liu,Jiajing Huang,Wenbo Lin,Jiawang Wen,Pochung Huang,Xiaoliang Zeng,Yan Zhang,Qianlong Wang,Yue Lin
Thermal interface materials (TIMs) play a pivotal role in the transfer of heat from high-temperature sources, such as CPUs, to heat sinks in power electronics. The effectiveness of grease-type TIMs is determined by their effective thermal impedance ( R EFF ), which hinges on optimizing both the specific bulk ( R B ) and contact ( R C ) thermal resistances. Achieving concurrent optimization of these resistances poses a significant challenge, especially in high filler loading TIMs, typically above 76 vol%. This research leverages interface engineering through Self-Assembled Monolayers (SAMs) to address this challenge. A substantial decrease in R EFF is realized to 0.169 K cm 2 W −1 , a tenfold enhancement compared to non-SAM treated TIMs, which exhibit R EFF values of 2.265 K cm 2 W −1 . This leap in performance is primarily ascribed to the reduced surface energy of SAM treated Al 2 O 3 , leading to lower particle-to-particle Van der Waals forces, thereby improving particle dispersion and strengthening interfacial bonds. Furthermore, longer carbon chains in SAMs result in increased R B , yet a decrease in R C , due to the chains' capacity for enhanced energy absorption and molecular entanglement. The investigation underscores the significance of shorter-chain SAMs in fine-tuning thermal resistance, highlighting the crucial role of molecular architecture in the design of advanced TIMs.
研究领域:
材料科学
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热管理工程
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DOI
高影响因子
CORROSION SCIENCE
·
2017
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IF 5.245
Ke Hu,Jia Zhuang,Jiating Ding,Zhu Ma,Fang Wang,Xianguang Zeng
The biological macromolecule DNA was used as green corrosion inhibitor to protect X80 carbon steel against 1 M HCl solution, and the corrosion behavior was systematically investigated by weight loss, electrochemical measurements, FTIR, and quantum chemistry calculation et al. The results showed that the maximum inhibition efficiency of compound DNA reached 91.9%. It was found that the chemisorption of DNA inhibitor on carbon steel surface resulted from single-molecular-layer self-assembly. The theoretical calculation verified the relationship between the DNA molecular structure and the corrosion inhibition efficiency. The results further demonstrated that the DNA was a promising environment-friend inhibitor with effective inhibition efficiency.
研究领域:
材料科学
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电化学
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生物化学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2014
·Vol. 15
·期 4
·6412-6422
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IF 2.339
Jiushuai Xu,Ruibin Fan,Jiaolong Wang,Mengke Jia,Xuanrui Xiong,Fang Wang
Copper films were grown on (3-Mercaptopropyl)trimethoxysilane (MPTMS), (3-Aminopropyl)triethoxysilane (APTES) and 6-(3-(triethoxysilyl)propylamino)-1,3,5- triazine-2,4-dithiol monosodium (TES) self-assembled monolayers (SAMs) modified acrylonitrile-butadiene-styrene (ABS) substrate via electroless copper plating. The copper films were examined using scanning electron microscopy (SEM) and X-ray diffraction (XRD). Their individual deposition rate and contact angle were also investigated to compare the properties of SAMs and electroless copper films. The results indicated that the formation of copper nuclei on the TES-SAMs modified ABS substrate was faster than those on the MPTMS-SAMs and APTES-SAMs modified ABS substrate. SEM images revealed that the copper film on TES-SAM modified ABS substrate was smooth and uniform, and the density of copper nuclei was much higher. Compared with that of TES-SAMs modified resin, the coverage of copper nuclei on MPTMS and APTES modified ABS substrate was very limited and the copper particle size was too big. The adhesion property test demonstrated that all the SAMs enhanced the interfacial interaction between copper plating and ABS substrate. XRD analysis showed that the copper film deposited on SAM-modified ABS substrate had a structure with Cu(111) preferred orientation, and the copper film deposited on TES-SAMs modified ABS substrate is better than that deposited on MPTMS-SAMs or APTES-SAMs modified ABS resins in electromigrtion resistance.Keywords:ABS resin;SAMs;electroless copper film;heterocyclic silane
研究领域:
材料科学
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化学工程
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PubMed
高影响因子
ADVANCED MATERIALS
·
2025
·Vol. 37
·期 26
·2501117
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IF 26.8
Yibo Kong,Wanhai Wang,Xiangwei Guo,Yuhui Yang,Tianyi Chen,Xiangjun Zheng,Wenxuan Yu,Yiming Wang,Mengting Wang,Yibo Hu,Chenran Xu,Yongjun Wu,Dawei Wang,Zijian Hong,Weihua Tang,Hongzheng Chen,Lijian Zuo
Molecular orientation stands as the quintessential hallmark of conjugated self-assembled monolayers (SAMs), which have recently catalyzed noteworthy advancements in organic photovoltaics (OPVs). Nevertheless, an unambiguous understanding of these directional arrangements and their impact on optoelectronic properties remains elusive. To address this issue, herein three SAMs with representative orientations, i.e., edge-on (BCZ-1), tilt-on (4PACz) and face-on (BCZ-2) are meticulously designed. These orientations have been rigorously validated by sum frequency generation vibrational spectroscopy and first-principles calculations. Remarkably, an unequivocal correlation between the molecular orientation and the device performance is discerned. Particularly, the edge-on oriented BCZ-1 exhibits the largest dipole moment normal to the electrode, accompanied by a dense and uniform coverage. These features collectively contribute to its strongest work function increment for ultra-fast hole extraction and minimum interfacial carrier recombination. As a result, a champion power conversion efficiency of 19.93% is achieved in devices based on BCZ-1 with D18:L8-BO as the active layer, representing one of the highest values reported for binary bulk heterojunction OPVs. Besides, BCZ-1 shows great potential for practical applications due to its superior up-scalability and enhanced device shelf-stability. Overall, this work offers in-depth insights into the orientation behaviors of SAMs, opening new avenues to unlock the efficiency potential of OPVs.
研究领域:
材料科学
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有机电子学
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光伏技术
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表面化学
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纳米技术
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DOI
PubMed
高影响因子
LANGMUIR
·
2022
·
IF 4.331
Hira Khalid,Esther Martine Opodi,Xianneng Song,Ziyan Wang,Baili Li,Lixian Tian,Xi Yu,Wenping Hu
The organization of the self-assembled monolayer (SAM) determines its electronic structure and so governs the charge transport process and device performance when adopted into a molecular device. We report a systematic study on the supramolecular structure and rectification performance of the ferrocene (11-ferrocenyl-1-undecanethiol, FUT) based SAM modulated by mixed SAM with inert 1-undecanethiol (C11SH) as diluent. We compared mixed SAMs by two different post assembly strategies, i.e., post assembly of C11SH on FUT SAM and post assembly of FUT on C11SH SAM. The organization and structure of FUT in the mixed SAM were extensively studied by cyclic voltammetry (CV) using the Laviron model. Rectification properties of the mixed SAM obtained using eutectic indium gallium (EGaIn) as the top electrode revealed that the magnitude and stability of the rectification ratio (RR) strongly correlated to not only the amount but also the phase structure and orientation of the FUT in the monolayer, resulting in a tunable RR and increased stability. The mixed monolayer achieved an increased performance relative to pure FUT by post assembling FUT on C11SH SAM, which formed an optimally dense and well-packed monolayer with the FUT head resting on the top of the alkane SAM.
研究领域:
材料科学
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电子工程
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化学
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PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2024
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IF 5.5
Shuchen Huang,Chunfeng Meng,Haopeng Chen,Zichuang Jiao,Jian Qiu,Hao Zhu,Fengjian Shi,Aihua Yuan,Hu Zhou
As the “holy grail” anode material for next-generation lithium batteries, the application of lithium metal has been long hindered due to the uncontrolled dendrites. Organic polymer coatings have shown advantages in regulating the ion diffusion and reducing the surface energy of the substrate, with which large lithium nucleis and better cycle stability can be obtained, whereas the electronic insulation property of the thick polymer is adverse for lithium deposition. Hence, self-assembled monolayers (SAMs) are anchored onto the surface of planar copper via a spontaneous thiol-to-copper reaction to obtain the modified current collectors with lower surface energy. The electron/ion transfer and lithiophilicity of the planar copper are adjusted by changing the length of the alkyl length and the ending groups. Therefore, lithium nucleation and growth behaviors are regulated, and large dough-like nucleis are generated on the planar copper grafted with 3-mercaptopropionic acid (Cu-MPA), displaying a nucleation overpotential of 17.6 mV and a reversible Coulombic efficiency of 98.4 % over 250 cycles (0.5 mA cm −2 , 1 mAh cm −2 ). This strategy provides a new avenue to achieve a stable Cu/Li interface and lithium metal anodes since the very beginning of the lithium nucleation.
研究领域:
材料科学
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电化学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
·
IF 9.4
Fangyuan Sun,Qingjun Wu,Yongsheng Fu,Libing Zheng,Kun Zheng,Ming Yang,Yanhui Feng
Epoxy resin (EP) based composite materials, due to their advantages such as light weight, ease of processing, and mechanical properties, have been widely applied across thermal packaging field. However, the overall thermal conductivity is constrained by the interfacial thermal resistance between the filler and the substrate. Existing studies suggest that self-assembled monolayers (SAM) can enhance the interfacial thermal conductance (ITC) by forming covalent bonds. Nevertheless, limited research has focused on using SAM to form bilateral covalent bonds to regulate ITC. Therefore, SAM capable of forming bilateral covalent bonds at the EP/silicon (Si) interface were employed to enhance ITC. In this study, time-domain thermoreflectance (TDTR) experiments and molecular dynamics (MD) simulations were conducted to investigate the EP/SAM/Si system. The results demonstrate that SAM-NH 2 modification, which forms bilateral covalent bonds at the EP/Si interface, increased the interfacial adhesion strength and enhanced ITC to 140%, thereby significantly promoting interfacial heat transfer. Conversely, ITC was reduced with SAM-CH 3 due to the formation of single covalent bond. Subsequently, the differential effective medium (DEM) model was used to determine that the thermal conductivity of the composite modified with SAM-NH 2 was improved by 11%. This study provides new insights into adjusting ITC using SAM.
研究领域:
材料科学
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热传导研究
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DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 15
·5212-5217
·
IF 0
Youfu Wang,Rulin Xiong,Luhua Dong,Aiguo Hu
A bottom-up synthesis of three-dimensional (3D) carbon nanomembranes (CNMs) was developed through Friedel–Crafts cross-linking of phenyl self-assembled monolayers (SAMs) on silica nanospheres (SNSs) followed by high temperature treatment and template removal. The CNMs show a hierarchically 3D connected porous structure and the pore sizes are facilely tuned by varying the sizes of SNS templates. CNMs with high surface area (>1500 m2 g−1), large pore volume (∼3 cm3 g−1) and partially graphitized frameworks exhibited good performances as supercapacitor electrode materials. The specific capacitance of the porous 3D CNMs reached 202 F g−1 at a current density of 0.5 A g−1 in an aqueous electrolyte.
研究领域:
材料科学
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能源科学
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DOI
ANALYTICA CHIMICA ACTA
·
2013
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IF 4.387
Yaping Li,Li Qi,Ying Shen,Huimin Ma
The core@shell Fe 3 O 4 @Au nanoparticles (NPs) functionalized with exchangeable self-assembled monolayers have been developed for mode switching magnetic solid-phase extraction (MSPE) using high performance liquid chromatography with ultraviolet detection. The adsorbents were synthesized by chemical coprecipitation to prepare magnetic cores followed by sonolysis to produce gold shells. Functionalization of Fe 3 O 4 @Au NPs surface was realized through self-assembly of commercially available low molecular weight thiol-containing ligands using gold shells as intermediate platform and the dynamic nature of Au–S chemistry allowed substituent of one thiol-containing ligand with another simply by thiol exchange process. The resultant adsorbents were characterized by transmission electronic microscopy, Fourier transform infrared spectroscopy, elemental analysis, contact angle measurement, and vibrating sample magnetometry. To evaluate the versatile performance of the developed MSPE adsorbents, they were applied for normal-phase SPE followed by reversed-phase SPE. A few kinds of diphenols and polycyclic aromatic hydrocarbons (PAHs) were employed as model analytes, respectively. The predominant parameters affecting extraction efficiency were investigated and optimized. Under the optimum experimental conditions, wide dynamic linear range (6.25–1600 μg L −1 for diphenols and 1.56–100 μg L −1 for PAHs) with good linearity ( r 2 ≥ 0.989) and low detection limits (0.34–16.67 μg L −1 for diphenols and 0.26–0.52 μg L −1 for PAHs) were achieved. The advantage of the developed method is that the Fe 3 O 4 @Au NPs could be reutilized for preconcentrating diverse target analytes in different SPE modes sequentially simply through treatment with desired thiol-containing ligands.
研究领域:
分析化学
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材料科学
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环境科学
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DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2024
·Vol. 26
·期 19
·14305-14316
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IF 2.9
Pu-An Lin,Bo Yang,Changqing Lin,Zhenghui Fan,Yu Chen,Wenfeng Zhang,Bing Cai,Jie Sun,Xiaojia Zheng,Wen-Hua Zhang
Self-assembled monolayers (SAMs) have been successfully employed to enhance the efficiency of inverted perovskite solar cells (PSCs) and perovskite/silicon tandem solar cells due to their facile low-temperature processing and superior device performance. Nevertheless, depositing uniform and dense SAMs with high surface coverage on metal oxide substrates remains a critical challenge. In this work, we propose a holistic strategy to construct composite hole transport layers (HTLs) by co-adsorbing mixed SAMs (MeO-2PACz and 2PACz) onto the surface of the H2O2-modified NiOx layer. The results demonstrate that the conductivity of the NiOx bulk phase is enhanced due to the H2O2 modification, thereby facilitating carrier transport. Furthermore, the hydroxyl-rich NiOx surface promotes uniform and dense adsorption of mixed SAM molecules while enhancing their anchoring stability. In addition, the energy level alignment at the interface is improved due to the utilization of mixed SAMs in an optimized ratio. Furthermore, the perovskite film crystal growth is facilitated by the uniform and dense composite HTLs. As a result, the power conversion efficiency of PSCs based on composite HTLs is boosted from 22.26% to 23.16%, along with enhanced operational stability. This work highlights the importance of designing and constructing NiOx/SAM composite HTLs as an effective strategy for enhancing both the performance and stability of inverted PSCs.
研究领域:
材料科学
·
能源技术
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DOI
PubMed
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2016
·Vol. 80
·期 2
·567-578
·
IF 1.473
Sui Wenjie,Zhao Wenjie,Zhang Xing,Peng Shusen,Zeng Zhixiang,Xue Qunji
In this paper, we tried to fabricate a compact and thick mercapto functional silica sol–gel coating to achieve excellent corrosion resistance performance on copper. A detailed comparative study of alkylthiol self-assembled monolayers (SAMs) and mercapto functional silica sol–gel coating prepared by 1-octanethiol, n -dodecanethiol and (3-mercaptopropyl)trimethoxysilane (MPTMS) was carried out. The elements composition and chemical bonding of the protective coatings were characterized by X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy. In addition, the cross section morphologies of Cu–MPTMS sol–gel coating were investigated by field emission scanning electron microscopy. The wettability of various coatings was investigated by contact angle measurement instrument. Finally, the anti-corrosion ability of the coatings was characterized using an electrochemical workstation. Results demonstrated that compared to other alkylthiol SAMs, the Cu–MPTMS sol–gel coating showed the best anti-corrosion property in sodium chloride solution because it owned a multiple hierarchic Si–O–Si network structure, thus to achieve a higher range of thickness and lengthen the diffusion path way of corrosive medium. It was also found that compact and thick mercapto functional silica sol–gel coating shows better corrosion resistance performance than other SAMs of the same type.
研究领域:
材料科学
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电化学
·
表面工程
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DOI
高影响因子
危险品化学品经营许可证（带存储）