It is well-known that microscale gaps or defects are ubiquitous and can be penetrated by vapor,resulting in the failure of superhydrophobic effect and undesired condensate flooding under high subcooling.Here,we propos...It is well-known that microscale gaps or defects are ubiquitous and can be penetrated by vapor,resulting in the failure of superhydrophobic effect and undesired condensate flooding under high subcooling.Here,we propose and demonstrate that such problem can be solved by the oblique arrangement of nanowires.Such a structure has been demonstrated to own anti-vapor-penetration and microdrop self-transport functions under high subcooling,unaffected by the microscale gaps.This is because vapor molecules can be intercepted by oblique nanowires and preferentially nucleate at near-surface locations,avoiding the penetration of vapor into the microscale gaps.As-formed microdrops can suspend upon the nanowires and have low solid-liquid adhesion.Besides,oblique nanowires can generate asymmetric surface tension and microdrop coalescence can release driving energy,both of which facilitate the microdrop self-removal via sweeping and jumping ways.This new design idea helps develop more advanced condensation mass and heat transfer interfaces.展开更多
A novel aerodynamic force capillary microdrop-injection-chemiluminescence(AFCM-CL) system for the determination of ethamsylate was proposed in this paper. In this system the ethamsylate microdrop formed at the end of ...A novel aerodynamic force capillary microdrop-injection-chemiluminescence(AFCM-CL) system for the determination of ethamsylate was proposed in this paper. In this system the ethamsylate microdrop formed at the end of the capillary droped into the reactor cell by the force of the gravity and the high press gas automatically. Then the ethamsylate was directly oxidized by dissolved oxygen in the presence of hexacyanoferrate(Ⅲ) to generate a CL signal in sodium hydroxide medium. The phenomena of sample zone dilution and spreading disappeared as the capillary was used as the sample channel and gas pressure was used as driving force without the carrier stream. Therefore, a high sensitivity was obtained compared with the FI-CL method. The analysis sample volume is only about 8 μL and the sample throughput is 180 h -1. The system shows that the ethamsylate is detected linearly in the mass concentration range from 5×10 -10—1×10 -6 g/mL. The detection limit is 1.4×10 -10 g/mL(1.1 pg). The relative standard deviation is 3.1% at 2.5×10 -8 g/mL(n=7).展开更多
基金This work was supported by National Key R&D Program of China(No.2017YFB0406100)the National Natural Science Foundation of China(No.21573276)Natural Science Foundation of Jiangsu Province(Nos.BK20170007 and BK20170425).
文摘It is well-known that microscale gaps or defects are ubiquitous and can be penetrated by vapor,resulting in the failure of superhydrophobic effect and undesired condensate flooding under high subcooling.Here,we propose and demonstrate that such problem can be solved by the oblique arrangement of nanowires.Such a structure has been demonstrated to own anti-vapor-penetration and microdrop self-transport functions under high subcooling,unaffected by the microscale gaps.This is because vapor molecules can be intercepted by oblique nanowires and preferentially nucleate at near-surface locations,avoiding the penetration of vapor into the microscale gaps.As-formed microdrops can suspend upon the nanowires and have low solid-liquid adhesion.Besides,oblique nanowires can generate asymmetric surface tension and microdrop coalescence can release driving energy,both of which facilitate the microdrop self-removal via sweeping and jumping ways.This new design idea helps develop more advanced condensation mass and heat transfer interfaces.
文摘A novel aerodynamic force capillary microdrop-injection-chemiluminescence(AFCM-CL) system for the determination of ethamsylate was proposed in this paper. In this system the ethamsylate microdrop formed at the end of the capillary droped into the reactor cell by the force of the gravity and the high press gas automatically. Then the ethamsylate was directly oxidized by dissolved oxygen in the presence of hexacyanoferrate(Ⅲ) to generate a CL signal in sodium hydroxide medium. The phenomena of sample zone dilution and spreading disappeared as the capillary was used as the sample channel and gas pressure was used as driving force without the carrier stream. Therefore, a high sensitivity was obtained compared with the FI-CL method. The analysis sample volume is only about 8 μL and the sample throughput is 180 h -1. The system shows that the ethamsylate is detected linearly in the mass concentration range from 5×10 -10—1×10 -6 g/mL. The detection limit is 1.4×10 -10 g/mL(1.1 pg). The relative standard deviation is 3.1% at 2.5×10 -8 g/mL(n=7).
