The Experts below are selected from a list of 15834 Experts worldwide ranked by ideXlab platform
Dennis P. Kalman - One of the best experts on this subject based on the ideXlab platform.
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Effect of Particle Hardness on the Penetration Behavior of Fabrics Intercalated with Dry Particles and Concentrated Particle-Fluid Suspensions
ACS applied materials & interfaces, 2009Co-Authors: Dennis P. Kalman, Richard L. Merrill, Norman J. Wagner, Eric D. WetzelAbstract:The penetration behavior of Kevlar fabric intercalated with dry Particles and shear thickening fluids (STF), highly concentrated fluid−Particle suspensions, is presented. In particular, the role of Particle Hardness is explored by comparing fabric treatments containing SiO2 Particles, which are significantly harder than Kevlar, to treatments containing softer poly(methyl methacrylate) (PMMA) Particles. The fabric testing includes yarn pull-out, quasi-static spike puncture, and ballistic penetration resistance, performed on single fabric layers. It was found that both dry Particle and STF treatments resulted in improvements in fabric properties relative to neat or poly(ethylene glycol) (PEG) treated fabrics. On comparison of treatments with different Particle Hardness, the SiO2 materials performed better in all tests than comparable PMMA materials, although the SiO2 treatments caused yarn failure in pull-out testing, reducing the total pull-out energy. In addition, resistance to yarn pull-out was found to ...
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Effects of Particle Hardness on Shear Thickening Colloidal Suspension Rheology
AIP Conference Proceedings, 2008Co-Authors: Dennis P. Kalman, Brian A. Rosen, Norman J. WagnerAbstract:Concentrated suspensions that reversibly shear thicken have also been reported to show a second shear‐thinning regime at high shear rates and stresses beyond shear‐thickening. We hypothesize that this behavior is due to the elastic Particle deformation driven by the high lubrication forces acting between the Particles in the hydroclusters. This limiting behavior is described here by an elastohydrodynamic model which predicts a limiting viscosity, η∝γ−1/2 Semi‐quantitative agreement is found by assuming Hertzian contact between the Particles and estimating the Particle shear modulus. High strain rate compression‐shear split Hopkinson pressure bar (CS‐SHPB) experiments are performed on shear thickening silica dispersions to test for this limiting behavior.
Norman J. Wagner - One of the best experts on this subject based on the ideXlab platform.
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Effect of Particle Hardness on the Penetration Behavior of Fabrics Intercalated with Dry Particles and Concentrated Particle-Fluid Suspensions
ACS applied materials & interfaces, 2009Co-Authors: Dennis P. Kalman, Richard L. Merrill, Norman J. Wagner, Eric D. WetzelAbstract:The penetration behavior of Kevlar fabric intercalated with dry Particles and shear thickening fluids (STF), highly concentrated fluid−Particle suspensions, is presented. In particular, the role of Particle Hardness is explored by comparing fabric treatments containing SiO2 Particles, which are significantly harder than Kevlar, to treatments containing softer poly(methyl methacrylate) (PMMA) Particles. The fabric testing includes yarn pull-out, quasi-static spike puncture, and ballistic penetration resistance, performed on single fabric layers. It was found that both dry Particle and STF treatments resulted in improvements in fabric properties relative to neat or poly(ethylene glycol) (PEG) treated fabrics. On comparison of treatments with different Particle Hardness, the SiO2 materials performed better in all tests than comparable PMMA materials, although the SiO2 treatments caused yarn failure in pull-out testing, reducing the total pull-out energy. In addition, resistance to yarn pull-out was found to ...
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Effects of Particle Hardness on Shear Thickening Colloidal Suspension Rheology
AIP Conference Proceedings, 2008Co-Authors: Dennis P. Kalman, Brian A. Rosen, Norman J. WagnerAbstract:Concentrated suspensions that reversibly shear thicken have also been reported to show a second shear‐thinning regime at high shear rates and stresses beyond shear‐thickening. We hypothesize that this behavior is due to the elastic Particle deformation driven by the high lubrication forces acting between the Particles in the hydroclusters. This limiting behavior is described here by an elastohydrodynamic model which predicts a limiting viscosity, η∝γ−1/2 Semi‐quantitative agreement is found by assuming Hertzian contact between the Particles and estimating the Particle shear modulus. High strain rate compression‐shear split Hopkinson pressure bar (CS‐SHPB) experiments are performed on shear thickening silica dispersions to test for this limiting behavior.
James D. Hogan - One of the best experts on this subject based on the ideXlab platform.
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An investigation of shear thickening fluids using ejecta analysis techniques
International Journal of Impact Engineering, 2016Co-Authors: Oren E. Petel, James D. HoganAbstract:Abstract In the present study, ejecta dynamics techniques are used to investigate the ballistic response of shear thickening Particle suspensions as a means of assessing the Particle Hardness and the role of interParticle friction during penetration. Through Particle material variations, the role of Particle material strength is discussed primarily through the ratio of the total lateral to total axial kinetic energy of the ejecta field at increasing impact velocities. Two dominant trends are observed in the relation between this ratio of kinetic energy and impact velocity, which are attributed to the properties of the suspended Particles. A qualitative model of Particle fracture and deformation is proposed to account for the experimental observations. The results of analytical Particle strain estimates and computational discrete element modelling of impact ejecta are used to inform the model and discuss the role of interParticle friction in the ejecta field.
Ki Jae Kim - One of the best experts on this subject based on the ideXlab platform.
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improved Particle Hardness of ti doped lini1 3co1 3mn1 3 xtixo2 as high voltage cathode material for lithium ion batteries
Journal of Physics and Chemistry of Solids, 2018Co-Authors: Woosuk Cho, Junho Song, Youngjun Kim, Ko-woon Lee, Min Woo Lee, Hyun-tae Kim, Ki Jae KimAbstract:Abstract Titanium doping on LiNi1/3Co1/3Mn1/3O2 cathode material is performed in a bid to improve its electrochemical and thermal properties at high voltage. The Particle Hardness is measured in order to verify the structural stability, and is found to improve from 104 to 143 MPa as a result of the Ti doping. Thus, high electrode density is obtained with less cracked Particles in the electrode. Electrode density of 3.9 g cm−3 is employed in order to confirm the effect of Particle Hardness on the electrochemical performance. The cycle performance is evaluated at 4.5 V and high temperature of 60 °C, and the obtained capacity retention after 50 cycles is found to be significantly improved via Ti doping. The cycled electrodes show that the generation of crack inside Particles are suppressed for Ti-doped LiNi1/3Co1/3Mn1/3O2. The thermal stability of the charged electrode is also improved via Ti doping, because of the enhanced structural stability. On the basis of these results, Ti is considered to be a viable dopant for improving Particle Hardness, which is an important factor as regards improving the electrochemical and thermal properties of LiNi1/3Co1/3Mn1/3O2.
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Improved Particle Hardness of Ti-doped LiNi1/3Co1/3Mn1/3-xTixO2 as high-voltage cathode material for lithium-ion batteries
Journal of Physics and Chemistry of Solids, 2018Co-Authors: Woosuk Cho, Junho Song, Youngjun Kim, Ko-woon Lee, Min Woo Lee, Hyun-tae Kim, Ki Jae KimAbstract:Abstract Titanium doping on LiNi1/3Co1/3Mn1/3O2 cathode material is performed in a bid to improve its electrochemical and thermal properties at high voltage. The Particle Hardness is measured in order to verify the structural stability, and is found to improve from 104 to 143 MPa as a result of the Ti doping. Thus, high electrode density is obtained with less cracked Particles in the electrode. Electrode density of 3.9 g cm−3 is employed in order to confirm the effect of Particle Hardness on the electrochemical performance. The cycle performance is evaluated at 4.5 V and high temperature of 60 °C, and the obtained capacity retention after 50 cycles is found to be significantly improved via Ti doping. The cycled electrodes show that the generation of crack inside Particles are suppressed for Ti-doped LiNi1/3Co1/3Mn1/3O2. The thermal stability of the charged electrode is also improved via Ti doping, because of the enhanced structural stability. On the basis of these results, Ti is considered to be a viable dopant for improving Particle Hardness, which is an important factor as regards improving the electrochemical and thermal properties of LiNi1/3Co1/3Mn1/3O2.
Junho Song - One of the best experts on this subject based on the ideXlab platform.
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improved Particle Hardness of ti doped lini1 3co1 3mn1 3 xtixo2 as high voltage cathode material for lithium ion batteries
Journal of Physics and Chemistry of Solids, 2018Co-Authors: Woosuk Cho, Junho Song, Youngjun Kim, Ko-woon Lee, Min Woo Lee, Hyun-tae Kim, Ki Jae KimAbstract:Abstract Titanium doping on LiNi1/3Co1/3Mn1/3O2 cathode material is performed in a bid to improve its electrochemical and thermal properties at high voltage. The Particle Hardness is measured in order to verify the structural stability, and is found to improve from 104 to 143 MPa as a result of the Ti doping. Thus, high electrode density is obtained with less cracked Particles in the electrode. Electrode density of 3.9 g cm−3 is employed in order to confirm the effect of Particle Hardness on the electrochemical performance. The cycle performance is evaluated at 4.5 V and high temperature of 60 °C, and the obtained capacity retention after 50 cycles is found to be significantly improved via Ti doping. The cycled electrodes show that the generation of crack inside Particles are suppressed for Ti-doped LiNi1/3Co1/3Mn1/3O2. The thermal stability of the charged electrode is also improved via Ti doping, because of the enhanced structural stability. On the basis of these results, Ti is considered to be a viable dopant for improving Particle Hardness, which is an important factor as regards improving the electrochemical and thermal properties of LiNi1/3Co1/3Mn1/3O2.
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Improved Particle Hardness of Ti-doped LiNi1/3Co1/3Mn1/3-xTixO2 as high-voltage cathode material for lithium-ion batteries
Journal of Physics and Chemistry of Solids, 2018Co-Authors: Woosuk Cho, Junho Song, Youngjun Kim, Ko-woon Lee, Min Woo Lee, Hyun-tae Kim, Ki Jae KimAbstract:Abstract Titanium doping on LiNi1/3Co1/3Mn1/3O2 cathode material is performed in a bid to improve its electrochemical and thermal properties at high voltage. The Particle Hardness is measured in order to verify the structural stability, and is found to improve from 104 to 143 MPa as a result of the Ti doping. Thus, high electrode density is obtained with less cracked Particles in the electrode. Electrode density of 3.9 g cm−3 is employed in order to confirm the effect of Particle Hardness on the electrochemical performance. The cycle performance is evaluated at 4.5 V and high temperature of 60 °C, and the obtained capacity retention after 50 cycles is found to be significantly improved via Ti doping. The cycled electrodes show that the generation of crack inside Particles are suppressed for Ti-doped LiNi1/3Co1/3Mn1/3O2. The thermal stability of the charged electrode is also improved via Ti doping, because of the enhanced structural stability. On the basis of these results, Ti is considered to be a viable dopant for improving Particle Hardness, which is an important factor as regards improving the electrochemical and thermal properties of LiNi1/3Co1/3Mn1/3O2.
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relationship between Particle Hardness of lini1 3co1 3mn1 3o2 and its electrochemical stability at high temperature
Bulletin of The Korean Chemical Society, 2016Co-Authors: Junho Song, Youngjun Kim, Jaekwang Kim, Songhun YoonAbstract:LiNi1/3Co1/3Mn1/3O2 was synthesized as a cathode material for lithium-ion batteries by coprecipitation and solid-state synthesis. The precursor prepared by coprecipitation was sintered at 950–1000 °C for 10–15 h under air. A cathode material annealed at 950 °C for 10 h (NMC950-10) has 81% capacity retention, whereas another cathode material at 1000 °C for 15 h (NMC1000-15) has 85% capacity retention at the 80th cycle at a 60 °C cycle test temperature. Cross-sectional images of pressed electrodes reveal that this difference results from different degrees of Particle rupture. Image analysis shows that the percentages of Particle rupture in NMC950-10 and NMC1000-15 were 44% and 20%, respectively. The measured Particle Hardness of the cathode material is quantitatively related to the number of ruptured Particles in highly pressed electrodes. Therefore, the cathode material with higher Particle Hardness exhibits better cycle life performance in 60 °C cell tests.
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Relationship between Particle Hardness of LiNi1/3Co1/3Mn1/3O2 and its Electrochemical Stability at High Temperature
Bulletin of the Korean Chemical Society, 2016Co-Authors: Junho Song, Youngjun Kim, Jaekwang Kim, Songhun YoonAbstract:LiNi1/3Co1/3Mn1/3O2 was synthesized as a cathode material for lithium-ion batteries by coprecipitation and solid-state synthesis. The precursor prepared by coprecipitation was sintered at 950–1000 °C for 10–15 h under air. A cathode material annealed at 950 °C for 10 h (NMC950-10) has 81% capacity retention, whereas another cathode material at 1000 °C for 15 h (NMC1000-15) has 85% capacity retention at the 80th cycle at a 60 °C cycle test temperature. Cross-sectional images of pressed electrodes reveal that this difference results from different degrees of Particle rupture. Image analysis shows that the percentages of Particle rupture in NMC950-10 and NMC1000-15 were 44% and 20%, respectively. The measured Particle Hardness of the cathode material is quantitatively related to the number of ruptured Particles in highly pressed electrodes. Therefore, the cathode material with higher Particle Hardness exhibits better cycle life performance in 60 °C cell tests.