The Experts below are selected from a list of 15171 Experts worldwide ranked by ideXlab platform
Hongbo Zeng - One of the best experts on this subject based on the ideXlab platform.
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Buckling Effect of Sole Zeolitic Imidazolate Framework-8 Nanoparticles Adsorbed at the Water/Oil Interface.
Langmuir : the ACS journal of surfaces and colloids, 2020Co-Authors: Ping Song, Xiaohui Mao, Yuxuan Ren, Hongbo ZengAbstract:The Buckling phenomenon of sole zeolitic imidazolate framework-8 (ZIF-8) particles adsorbed at the water/oil interface was systematically studied. The droplet of ZIF-8 water dispersion was pended in oil for a certain time period and manually extracted to decrease the volume. With the reduction of interfacial area, the ZIF-8 particles were jammed together to form a wrinkling solid film at the water/oil interface, which could withstand the extraction of the droplet and be regenerated. The size and concentration of the particles affected the assembly kinetics. The rapidest assembly was observed for the medium-sized ZIF-8 particles (m-ZIF-8) among the three sizes tested (1.81 μm, 258 nm, and 51 nm). The droplet of 0.91 wt % m-ZIF-8 reached a nearly full surface coverage in 13 min, faster than those with the lower concentration of 0.46 or 0.28 wt %. The pH of the solution, ranging between 6 and 10.7, affected both the assembly kinetics and film stability. Cryo-scanning electron microscopy images of frozen m-ZIF-8-stabilized Picking emulsions showed a monolayer of ZIF-8 wetted by both oil and water phases. The observed Buckling Effect could be attributed to the stable adsorption of ZIF-8 at the water/oil interface and the interparticle interactions, related to the unique surface chemistry and polyhedral shape of the ZIF-8 crystals. This work provided some understanding on the interfacial property of ZIF-8 and the mechanism of sole ZIF-8-stabilized Pickering emulsions.
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Buckling Effect of sole zeolitic imidazolate framework 8 nanoparticles adsorbed at the water oil interface
Langmuir, 2020Co-Authors: Ping Song, Xiaohui Mao, Yuxuan Ren, Hongbo ZengAbstract:The Buckling phenomenon of sole zeolitic imidazolate framework-8 (ZIF-8) particles adsorbed at the water/oil interface was systematically studied. The droplet of ZIF-8 water dispersion was pended in oil for a certain time period and manually extracted to decrease the volume. With the reduction of interfacial area, the ZIF-8 particles were jammed together to form a wrinkling solid film at the water/oil interface, which could withstand the extraction of the droplet and be regenerated. The size and concentration of the particles affected the assembly kinetics. The rapidest assembly was observed for the medium-sized ZIF-8 particles (m-ZIF-8) among the three sizes tested (1.81 μm, 258 nm, and 51 nm). The droplet of 0.91 wt % m-ZIF-8 reached a nearly full surface coverage in 13 min, faster than those with the lower concentration of 0.46 or 0.28 wt %. The pH of the solution, ranging between 6 and 10.7, affected both the assembly kinetics and film stability. Cryo-scanning electron microscopy images of frozen m-ZIF-8-stabilized Picking emulsions showed a monolayer of ZIF-8 wetted by both oil and water phases. The observed Buckling Effect could be attributed to the stable adsorption of ZIF-8 at the water/oil interface and the interparticle interactions, related to the unique surface chemistry and polyhedral shape of the ZIF-8 crystals. This work provided some understanding on the interfacial property of ZIF-8 and the mechanism of sole ZIF-8-stabilized Pickering emulsions.
I. Gallego - One of the best experts on this subject based on the ideXlab platform.
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quasi static crush energy absorption capability of e glass polyester and hybrid e glass basalt polyester composite structures
Materials & Design, 2015Co-Authors: A. Esnaola, Jon Aurrekoetxea, I. Ulacia, L. Aretxabaleta, I. GallegoAbstract:Abstract Feasibility of basalt fibre composites for automotive crash applications has been analysed and compared with E-glass fibre composites in the present study. Semi-hexagonal composite structures with different stacking sequences of E-glass and basalt fibres have been tested in quasi-static crush conditions and specific energy absorption (SEA) capability has been calculated. Samples with unidirectional and bidirectional E-glass fibres have shown the highest SEA values, around 30 kJ/kg. However different deformation mechanisms of energy absorption have been observed. On the other side, basalt/polyester samples have exhibited unstable collapse due to Buckling Effect during crushing process. Therefore the crush behaviour of the present basalt/polyester configuration is not suitable for automotive crash applications. Regarding the hybrid configuration using E-glass and basalt fibres with polyester, it has been shown that unstable collapse problems of basalt/polyester have been avoided. However the SEA values for this configuration are lower comparing with those values obtained by E-glass/polyester configurations. Adhesion between fibre plies of different material has caused delamination with low energy absorption capability.
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Quasi-static crush energy absorption capability of E-glass/polyester and hybrid E-glass–basalt/polyester composite structures
Materials & Design, 2015Co-Authors: A. Esnaola, Jon Aurrekoetxea, I. Ulacia, L. Aretxabaleta, I. GallegoAbstract:Abstract Feasibility of basalt fibre composites for automotive crash applications has been analysed and compared with E-glass fibre composites in the present study. Semi-hexagonal composite structures with different stacking sequences of E-glass and basalt fibres have been tested in quasi-static crush conditions and specific energy absorption (SEA) capability has been calculated. Samples with unidirectional and bidirectional E-glass fibres have shown the highest SEA values, around 30 kJ/kg. However different deformation mechanisms of energy absorption have been observed. On the other side, basalt/polyester samples have exhibited unstable collapse due to Buckling Effect during crushing process. Therefore the crush behaviour of the present basalt/polyester configuration is not suitable for automotive crash applications. Regarding the hybrid configuration using E-glass and basalt fibres with polyester, it has been shown that unstable collapse problems of basalt/polyester have been avoided. However the SEA values for this configuration are lower comparing with those values obtained by E-glass/polyester configurations. Adhesion between fibre plies of different material has caused delamination with low energy absorption capability.
Ping Song - One of the best experts on this subject based on the ideXlab platform.
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Buckling Effect of Sole Zeolitic Imidazolate Framework-8 Nanoparticles Adsorbed at the Water/Oil Interface.
Langmuir : the ACS journal of surfaces and colloids, 2020Co-Authors: Ping Song, Xiaohui Mao, Yuxuan Ren, Hongbo ZengAbstract:The Buckling phenomenon of sole zeolitic imidazolate framework-8 (ZIF-8) particles adsorbed at the water/oil interface was systematically studied. The droplet of ZIF-8 water dispersion was pended in oil for a certain time period and manually extracted to decrease the volume. With the reduction of interfacial area, the ZIF-8 particles were jammed together to form a wrinkling solid film at the water/oil interface, which could withstand the extraction of the droplet and be regenerated. The size and concentration of the particles affected the assembly kinetics. The rapidest assembly was observed for the medium-sized ZIF-8 particles (m-ZIF-8) among the three sizes tested (1.81 μm, 258 nm, and 51 nm). The droplet of 0.91 wt % m-ZIF-8 reached a nearly full surface coverage in 13 min, faster than those with the lower concentration of 0.46 or 0.28 wt %. The pH of the solution, ranging between 6 and 10.7, affected both the assembly kinetics and film stability. Cryo-scanning electron microscopy images of frozen m-ZIF-8-stabilized Picking emulsions showed a monolayer of ZIF-8 wetted by both oil and water phases. The observed Buckling Effect could be attributed to the stable adsorption of ZIF-8 at the water/oil interface and the interparticle interactions, related to the unique surface chemistry and polyhedral shape of the ZIF-8 crystals. This work provided some understanding on the interfacial property of ZIF-8 and the mechanism of sole ZIF-8-stabilized Pickering emulsions.
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Buckling Effect of sole zeolitic imidazolate framework 8 nanoparticles adsorbed at the water oil interface
Langmuir, 2020Co-Authors: Ping Song, Xiaohui Mao, Yuxuan Ren, Hongbo ZengAbstract:The Buckling phenomenon of sole zeolitic imidazolate framework-8 (ZIF-8) particles adsorbed at the water/oil interface was systematically studied. The droplet of ZIF-8 water dispersion was pended in oil for a certain time period and manually extracted to decrease the volume. With the reduction of interfacial area, the ZIF-8 particles were jammed together to form a wrinkling solid film at the water/oil interface, which could withstand the extraction of the droplet and be regenerated. The size and concentration of the particles affected the assembly kinetics. The rapidest assembly was observed for the medium-sized ZIF-8 particles (m-ZIF-8) among the three sizes tested (1.81 μm, 258 nm, and 51 nm). The droplet of 0.91 wt % m-ZIF-8 reached a nearly full surface coverage in 13 min, faster than those with the lower concentration of 0.46 or 0.28 wt %. The pH of the solution, ranging between 6 and 10.7, affected both the assembly kinetics and film stability. Cryo-scanning electron microscopy images of frozen m-ZIF-8-stabilized Picking emulsions showed a monolayer of ZIF-8 wetted by both oil and water phases. The observed Buckling Effect could be attributed to the stable adsorption of ZIF-8 at the water/oil interface and the interparticle interactions, related to the unique surface chemistry and polyhedral shape of the ZIF-8 crystals. This work provided some understanding on the interfacial property of ZIF-8 and the mechanism of sole ZIF-8-stabilized Pickering emulsions.
Togay Ozbakkaloglu - One of the best experts on this subject based on the ideXlab platform.
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cyclic stress strain model incorporating Buckling Effect for steel reinforcing bars embedded in frp confined concrete
Composite Structures, 2017Co-Authors: Togay OzbakkalogluAbstract:Abstract Buckling of steel reinforcement usually causes a sudden loss of the load-carrying capacity and the ultimate state of conventional reinforced concrete (RC) cylinders. However, reinforcing bars behave differently in fiber-reinforced polymer (FRP)-confined RC cylinders due to the lateral confinement Effect of FRP. This paper presents a theoretical study into the Buckling behavior of longitudinal steel reinforcing bars embedded in FRP-confined concrete subjected to cyclic axial compression. An empirical monotonic compressive stress-strain model considering the Buckling Effects proposed previously for laterally supported reinforcing bars is extended to a cyclic model by combining the monotonic envelope and the Menegotto-Pinto model accounting for the cyclic loops. The cyclic stress-strain models for both laterally supported reinforcing bars and FRP-confined plain concrete are then implemented into the OpenSees software platform and validated through comparisons with compressive test results on cyclically loaded FRP-confined plain and RC cylinders. The proposed cyclic stress-strain model for laterally supported reinforcing bars is expected to serve as a fundamental model for predicting the seismic behavior of FRP-strengthened RC cylinders with widely-spaced transverse ties under cyclic axial compression, in which case the local Buckling of reinforcing bars usually occurs between two adjacent transverse ties.
A. Esnaola - One of the best experts on this subject based on the ideXlab platform.
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quasi static crush energy absorption capability of e glass polyester and hybrid e glass basalt polyester composite structures
Materials & Design, 2015Co-Authors: A. Esnaola, Jon Aurrekoetxea, I. Ulacia, L. Aretxabaleta, I. GallegoAbstract:Abstract Feasibility of basalt fibre composites for automotive crash applications has been analysed and compared with E-glass fibre composites in the present study. Semi-hexagonal composite structures with different stacking sequences of E-glass and basalt fibres have been tested in quasi-static crush conditions and specific energy absorption (SEA) capability has been calculated. Samples with unidirectional and bidirectional E-glass fibres have shown the highest SEA values, around 30 kJ/kg. However different deformation mechanisms of energy absorption have been observed. On the other side, basalt/polyester samples have exhibited unstable collapse due to Buckling Effect during crushing process. Therefore the crush behaviour of the present basalt/polyester configuration is not suitable for automotive crash applications. Regarding the hybrid configuration using E-glass and basalt fibres with polyester, it has been shown that unstable collapse problems of basalt/polyester have been avoided. However the SEA values for this configuration are lower comparing with those values obtained by E-glass/polyester configurations. Adhesion between fibre plies of different material has caused delamination with low energy absorption capability.
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Quasi-static crush energy absorption capability of E-glass/polyester and hybrid E-glass–basalt/polyester composite structures
Materials & Design, 2015Co-Authors: A. Esnaola, Jon Aurrekoetxea, I. Ulacia, L. Aretxabaleta, I. GallegoAbstract:Abstract Feasibility of basalt fibre composites for automotive crash applications has been analysed and compared with E-glass fibre composites in the present study. Semi-hexagonal composite structures with different stacking sequences of E-glass and basalt fibres have been tested in quasi-static crush conditions and specific energy absorption (SEA) capability has been calculated. Samples with unidirectional and bidirectional E-glass fibres have shown the highest SEA values, around 30 kJ/kg. However different deformation mechanisms of energy absorption have been observed. On the other side, basalt/polyester samples have exhibited unstable collapse due to Buckling Effect during crushing process. Therefore the crush behaviour of the present basalt/polyester configuration is not suitable for automotive crash applications. Regarding the hybrid configuration using E-glass and basalt fibres with polyester, it has been shown that unstable collapse problems of basalt/polyester have been avoided. However the SEA values for this configuration are lower comparing with those values obtained by E-glass/polyester configurations. Adhesion between fibre plies of different material has caused delamination with low energy absorption capability.
