Articles you may be interested inScaling of maximum velocity, body force, and power consumption of dielectric barrier discharge plasma actuators via particle image velocimetryThe effect of a DC bias on the electrohydrodynamics (EHD) force induced by a surface dielectric barrier AC discharge actuator for airflow control at the atmospheric pressure is investigated. The measurement of the surface potential due to charge deposition at different DC biases is carried out by using a special designed corona like discharge potential probe. From the surface potential data, the plasma electromotive force is shown not affected much by the DC biases except for some reduction of the DC bias near the exposed electrode edge for the sheath-like configuration. The total thrust is measured by an analytical balance, and an almost linear relationship to the potential voltage at the exposed electrode edge is found for the direct thrust force. The temporally averaged ionic wind characteristics are investigated by Pitot tube sensor and schlieren visualization system. It is found that the ionic wind velocity profiles with different DC biases are almost the same in the AC discharge plasma area but gradually diversified in the further downstream area as well as the upper space away from the discharge plasma area. Also, the DC bias can significantly modify the topology of the ionic wind produced by the AC discharge actuator. These results can provide an insight into how the DC biases to affect the force generation. V C 2015 AIP Publishing LLC.
A new superabsorbent copolymer, poly(sodium acrylate-co-sodium 1-(acryloyloxy) propan-2-yl phosphate) [P(SA-co-SAPP)], was synthesized by a novel prepared monomer, 1-(acryloyloxy) propan-2-yl phosphoryl dichloride. The swelling properties of the superabsorbent were investigated by comparison with poly(sodium acrylate) (PSA) and the copolymer of poly(sodium acrylate-co-2-hydroxypropyl acrylate) [P(SA-co-HPA)]. The results showed that (1) the superabsorbent containing sodium 1-(acryloyloxy) propan-2-yl phosphate had higher water absorbency at general testing conditions;(2) the swelling properties of P(SA-co-SAPP) and PSA were obviously influenced by pH of solutions, which were different from that of P(SA-co-HPA); (3) the swelling process and the saturated water absorbency of all superabsorbents were remarkably affected by cations, especially multivalent ones, while barely affected by anions.
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