The Experts below are selected from a list of 44910 Experts worldwide ranked by ideXlab platform
Liming Dai - One of the best experts on this subject based on the ideXlab platform.
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carbon nanotube dry adhesives with temperature Enhanced Adhesion over a large temperature range
Nature Communications, 2016Co-Authors: Sabyasachi Ganguli, Ajit K Roy, Liming DaiAbstract:Adhesives typically lose Adhesion strength at high temperatures. Here, the authors design a carbon nanotube dry adhesive that becomes stronger with rising temperature, and ascribe this counterintuitive behavior to a thermally-induced nanoscale interlocking mechanism.
Lingzhi Zhang - One of the best experts on this subject based on the ideXlab platform.
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polyvinyl alcohol grafted poly acrylic acid as water soluble binder with Enhanced Adhesion capability and electrochemical performances for si anode
Journal of Alloys and Compounds, 2018Co-Authors: Lingzhi ZhangAbstract:Abstract Polyvinyl alcohol grafted poly (acrylic acid) (PVA-g-PAA) is synthesized through graft polymerization of acrylic acid (AA) onto PVA backbone via a free radical reaction. PVA-g-PAA is used as a water-soluble binder for silicon (Si) anodes in lithium-ion batteries (LIBs). The Enhanced Adhesion strength, excellent flexibility and high electrolyte uptake after grafting reaction render PVA-g-PAA a robust binder for Si anodes. Compared to linear PVA, PAA and CMC, optimal Si-PVA-g-10PAA electrode exhibits better cycle stability, higher Coulombic efficiency and more excellent rate capability, possessing a high electrical conductivity, low SEI/charge transfer resistance and fast lithium-ion diffusion coefficient. PVA-g-PAA binder not only maintains the electrode's mechanical and electrical integrity, facilitates a favorable electrochemical kinetics, but also assists in forming a stable SEI layer on Si surface upon long-term cycling. Such a strategy sheds light on the design of novel polymer binders for practical applications of high-capacity active materials with great volume change.
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cyanoethylated carboxymethyl chitosan as water soluble binder with Enhanced Adhesion capability and electrochemical performances for lifepo4 cathode
Electrochimica Acta, 2015Co-Authors: J Q Wang, Haoxiang Zhong, Jianning Ding, Lingzhi ZhangAbstract:Abstract Cyanoethylated carboxymethyl chitosan (CN-CCTS) has been synthesized through a straightforward cyanoethylation reaction by reacting CCTS with acrylonitrile in NaOH aqueous solution. CN-CCTS shows improved Adhesion strength of 0.047 N/cm as compared with 0.013 N/cm for CCTS after introducing cyanoethyl group in the chemical structure of CCTS. The electrochemical performances of LiFePO 4 electrode with CN-CCTS binder have been investigated and compared with those using water soluble sodium carboxymethyl cellulose (CMC) and non-aqueous polyvinylidene difluoride (PVDF) binder. LiFePO 4 electrode with CN-CCTS exhibits better cycling stability and rate capability, retaining 56.3% capacity of C/5 at 5C rate as compared with 48.4% and 32.8% for CMC and PVDF, respectively. Cyclic voltammetry and electrochemical impedance spectroscopy measurement reveal that LiFePO 4 electrode with CN-CCTS has a more favorable electrochemical kinetics than that with CMC and PVDF, thus better rate capability.
Alfred J. Crosby - One of the best experts on this subject based on the ideXlab platform.
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Enhanced Adhesion of elastic materials to small scale wrinkles
Langmuir, 2012Co-Authors: Chelsea S. Davis, Anke Lindner, David Martina, Costantino Creton, Alfred J. CrosbyAbstract:The adhesive properties of a material can be greatly affected simply by wrinkling its surface. We show the importance of selecting the wrinkle feature sizes (amplitude, b; and wavelength, λ) that complement the material-defined length scale related to the Adhesion energy and modulus. A rigid circular cylindrical punch patterned with aligned wrinkles ranging in amplitude from 0.5 to 5.0 μm with a fixed aspect ratio of 0.1 is used to characterize the Adhesion of elastic films of smooth poly(dimethyl siloxane) (PDMS). The cross-linker concentration used to form the PDMS layers is varied to determine the impact of material properties on wrinkled surface Adhesion. The elastic films have an average thickness of 240 μm and the average probe radius is 1 mm, leading to a confined contact scenario. The separation stress and work of debonding are presented for each cross-linker concentration with testing rates ranging over 3 orders of magnitude. For stiffer films (10 wt % cross-linker, E' ≈ 3.00 MPa), small wrinkles...
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Enhanced Adhesion of elastic materials to small scale wrinkles
Langmuir, 2012Co-Authors: Chelsea S. Davis, Anke Lindner, David Martina, Costantino Creton, Alfred J. CrosbyAbstract:The adhesive properties of a material can be greatly affected simply by wrinkling its surface. We show the importance of selecting the wrinkle feature sizes (amplitude, b; and wavelength, λ) that complement the material-defined length scale related to the Adhesion energy and modulus. A rigid circular cylindrical punch patterned with aligned wrinkles ranging in amplitude from 0.5 to 5.0 μm with a fixed aspect ratio of 0.1 is used to characterize the Adhesion of elastic films of smooth poly(dimethyl siloxane) (PDMS). The cross-linker concentration used to form the PDMS layers is varied to determine the impact of material properties on wrinkled surface Adhesion. The elastic films have an average thickness of 240 μm and the average probe radius is 1 mm, leading to a confined contact scenario. The separation stress and work of debonding are presented for each cross-linker concentration with testing rates ranging over 3 orders of magnitude. For stiffer films (10 wt % cross-linker, E' ≈ 3.00 MPa), small wrinkles (b ≈ 0.5 μm) increase the separation stress by nearly 200% relative to a smooth interface whereas large wrinkles (b ≈ 5.0 μm) are shown to reduce Adhesion significantly. A substantial increase in the debonding energy is also observed for these small-amplitude wrinkles contacting stiff materials. No discernible impact of wrinkled surface topography on the Adhesion of softer (2 and 4 wt % cross-linker, 0.05 MPa < E' < 0.30 MPa) films is measured.
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designing model systems for Enhanced Adhesion
Mrs Bulletin, 2007Co-Authors: Edwin P Chan, Christian Greiner, Eduard Arzt, Alfred J. CrosbyAbstract:Nature provides inspiration for Enhanced control of Adhesion through numerous examples ranging from geckos to jumping spiders. The primary strategy in these examples is the incorporation of patterns, specifically high-aspect-ratio topographic features, to ingeniously maximize Adhesion forces while maintaining ease of release. Recently, considerable research efforts have been devoted toward the understanding, development, and optimization of synthetic analogues to these examples in nature. In this article, we provide insight into the mechanisms that lead to Enhanced control of interfacial properties through patterning, the strategies that can be used for fabricating synthetic patterns, and an overview of experimental results that have been used to gain understanding and guidance in this emerging field.
J M F Ferreira - One of the best experts on this subject based on the ideXlab platform.
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diopside ba disilicate glass ceramic sealants for sofcs Enhanced Adhesion and thermal stability by sr for ca substitution
International Journal of Hydrogen Energy, 2013Co-Authors: Allu Amarnath Reddy, Dilshat U Tulyaganov, M J Pascual, V V Kharton, E V Tsipis, V A Kolotygin, J M F FerreiraAbstract:This article reports on the influence of strontium for calcium substitution in diopsideeBa disilicate glasseceramics on stabilization thermal parameters and improvement Adhesion to interconnect material of SOFCs. Sr replaced 10, 20, 30 and 40% of Ca in the Ca0.9MgAl0.1La0.1Si1.9O6 component of the parent glass having the following composition, mol.%: 22.14 CaO, 24.60 MgO, 0.52 BaO, 1.23 Al2O3, 1.23 La2O3, 47.79 SiO2, 1.69 B2O3, 0.79 NiO. 29 SieMASeNMR and 27 Al MASeNMR spectra of the glasses revealed irrelevant chemical shifts for silicon and aluminum atoms upon changing the SrO content. Tg decreased and coefficient of thermal expansion (CTE) increased by Sr for Ca substitution in pyroxene glasses. Additionally SrO-containing glasses exhibited a viscosity of w10 6 dPa s at 900 � C, which is suitable for joining of SOFC metallic/ceramic components by glass/glasseceramic sealing upon stack hermetization. Glasseceramics revealed long term (up to 1000 h) thermal stability at 900 � C and suitable CTE values (10.0e11.3) � 10 � 6 K � 1 , high electrical
Changyong Wang - One of the best experts on this subject based on the ideXlab platform.
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Exendin-4 Pretreated Adipose Derived Stem Cells Are Resistant to Oxidative Stress and Improve Cardiac Performance via Enhanced Adhesion in the Infarcted
2016Co-Authors: Jianfeng Liu, Haibin Wang, Yan Wang, Yujing Yin, Liman Wang, Zhiqiang Liu, Junjie Yang, Yundai Chen, Changyong WangAbstract:Reactive oxygen species (ROS), which were largely generated after myocardial ischemia, severely impaired the Adhesion and survival of transplanted stem cells. In this study, we aimed to determine whether Exendin-4 pretreatment could improve the Adhesion and therapeutic efficacy of transplanted adipose derived stem cells (ADSCs) in ischemic myocardium. In vitro, H2O2 was used to provide ROS environments, in which ADSCs pretreated with Exendin-4 were incubated. ADSCs without pretreatment were used as control. Then, cell Adhesion and viability were analyzed with time. Compared with control ADSCs, Exendin-4 treatment significantly increased the Adhesion of ADSCs in ROS environment, while reduced intracellular ROS and cell injury as determined by dihydroethidium (DHE) staining live/Dead staining, lactate dehydrogenase-release assay and MTT assay. Western Blotting demonstrated that ROS significantly decreased the expression of Adhesion-related integrins and integrin-related focal Adhesion proteins, which were significantly reversed by Exendin-4 pretreatment and followed by decreases in caspase-3, indicating that Exendin-4 may facilitate cell survival through Enhanced Adhesion. In vivo, myocardial infarction (MI) was induced by the left anterior descending artery ligation in SD rats. Autologous ADSCs with or without Exendin-4 pretreatment were injected into the border area of infarcted hearts, respectively. Multi-techniques were used to assess the beneficial effects after transplantation. Longitudinal bioluminescence imaging and histological staining revealed that Exendin-4 pretreatment Enhanced the survival and differentiation of engrafted ADSCs in ischemi
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exendin 4 pretreated adipose derived stem cells are resistant to oxidative stress and improve cardiac performance via Enhanced Adhesion in the infarcted heart
PLOS ONE, 2014Co-Authors: Jianfeng Liu, Haibin Wang, Yan Wang, Yujing Yin, Liman Wang, Zhiqiang Liu, Junjie Yang, Yundai Chen, Changyong WangAbstract:Reactive oxygen species (ROS), which were largely generated after myocardial ischemia, severely impaired the Adhesion and survival of transplanted stem cells. In this study, we aimed to determine whether Exendin-4 pretreatment could improve the Adhesion and therapeutic efficacy of transplanted adipose derived stem cells (ADSCs) in ischemic myocardium. In vitro, H2O2 was used to provide ROS environments, in which ADSCs pretreated with Exendin-4 were incubated. ADSCs without pretreatment were used as control. Then, cell Adhesion and viability were analyzed with time. Compared with control ADSCs, Exendin-4 treatment significantly increased the Adhesion of ADSCs in ROS environment, while reduced intracellular ROS and cell injury as determined by dihydroethidium (DHE) staining live/Dead staining, lactate dehydrogenase-release assay and MTT assay. Western Blotting demonstrated that ROS significantly decreased the expression of Adhesion-related integrins and integrin-related focal Adhesion proteins, which were significantly reversed by Exendin-4 pretreatment and followed by decreases in caspase-3, indicating that Exendin-4 may facilitate cell survival through Enhanced Adhesion. In vivo, myocardial infarction (MI) was induced by the left anterior descending artery ligation in SD rats. Autologous ADSCs with or without Exendin-4 pretreatment were injected into the border area of infarcted hearts, respectively. Multi-techniques were used to assess the beneficial effects after transplantation. Longitudinal bioluminescence imaging and histological staining revealed that Exendin-4 pretreatment Enhanced the survival and differentiation of engrafted ADSCs in ischemic myocardium, accompanied with significant benefits in cardiac function, matrix remodeling, and angiogenesis compared with non-pretreated ADSCs 4 weeks post-transplantation. In conclusion, transplantation of Exendin-4 pretreated ADSCs significantly improved cardiac performance and can be an innovative approach in the clinical perspective.