The spontaneously generated electrical charge of a droplet dispensed from conventional pipetting is undesirable and unpredictable for most experiments that use pipetting.Hence,a method for controlling and removing the...The spontaneously generated electrical charge of a droplet dispensed from conventional pipetting is undesirable and unpredictable for most experiments that use pipetting.Hence,a method for controlling and removing the electrical charge needs to be developed.In this study,by using the electrode-deposited pipet tip(E-pipet tip),the charge-controlling system is newly developed and the electrical charge of a droplet is precisely controlled.The effect of electrolyte concentration and volume of the transferred solution to the electrical charge of a dispensed droplet is theoretically and experimentally investigated by using the equivalent capacitor model.Furthermore,a proof-of-concept example of the self-alignment and self-assembly of sequentially dispensed multiple droplets is demonstrated as one of the potential applications.Given that the electrical charge of the various aqueous droplets can be precisely and simply controlled,the fabricated E-pipet tip can be broadly utilized not only as a general charge-controlling platform of aqueous droplets but also as a powerful tool to explore fundamental scientific research regarding electrical charge of a droplet,such as the surface oscillation and evaporation of charged droplets.展开更多
In this paper a new chemical oscillating reaction in the pyruvic acid-BrO-H2SO4 - [CuL](ClO4)2 system, where L is 5, 7, 12, 14-tetraethyl-7, 14-dimethyl-1, 4, 8, 11 -tetraazacyclotetradeca-4, 11-diene, is reported. Th...In this paper a new chemical oscillating reaction in the pyruvic acid-BrO-H2SO4 - [CuL](ClO4)2 system, where L is 5, 7, 12, 14-tetraethyl-7, 14-dimethyl-1, 4, 8, 11 -tetraazacyclotetradeca-4, 11-diene, is reported. The features of the oscillations are studied in detail. The effects of Ag+,Hg2+,CCl4, Vc, H2O2, acrylonitrile, and temperature on the oscillation system are also discussed.展开更多
融合绿色化学理念,创新基础化学实验蒽与马来酸酐Diels-Alder的反应与重结晶条件,设计采用无毒、水溶性、高沸点的二甘醇二甲醚作为蒽与马来酸酐Diels-Alder反应的溶剂,重结晶体系为二甘醇二甲醚—石油醚混合溶剂。产物经熔点、红外(IR...融合绿色化学理念,创新基础化学实验蒽与马来酸酐Diels-Alder的反应与重结晶条件,设计采用无毒、水溶性、高沸点的二甘醇二甲醚作为蒽与马来酸酐Diels-Alder反应的溶剂,重结晶体系为二甘醇二甲醚—石油醚混合溶剂。产物经熔点、红外(IR)光谱和核磁共振氢谱(1 H NMR)分析表征。采用气相扩散方法培养单晶,产物的晶体结构经X-射线单晶衍射分析。实验方法具有绿色、环保、反应条件温和、后处理简便、收率高等特点,整个实验体系综合性强。展开更多
基金supported by the National Research Foundation of Korea(NRF)grant funded by the Korea government(MSIP).(No.2014R1A2A1A010065272011-0030075+1 种基金2012R1A2A2A06047424)supported by the convergence technology development program for bionic arm through the National Research Foundation of Korea(NRF)funded by the Ministry of Science,ICT&Future Planning(No.2014M3C1B2048632)
文摘The spontaneously generated electrical charge of a droplet dispensed from conventional pipetting is undesirable and unpredictable for most experiments that use pipetting.Hence,a method for controlling and removing the electrical charge needs to be developed.In this study,by using the electrode-deposited pipet tip(E-pipet tip),the charge-controlling system is newly developed and the electrical charge of a droplet is precisely controlled.The effect of electrolyte concentration and volume of the transferred solution to the electrical charge of a dispensed droplet is theoretically and experimentally investigated by using the equivalent capacitor model.Furthermore,a proof-of-concept example of the self-alignment and self-assembly of sequentially dispensed multiple droplets is demonstrated as one of the potential applications.Given that the electrical charge of the various aqueous droplets can be precisely and simply controlled,the fabricated E-pipet tip can be broadly utilized not only as a general charge-controlling platform of aqueous droplets but also as a powerful tool to explore fundamental scientific research regarding electrical charge of a droplet,such as the surface oscillation and evaporation of charged droplets.
文摘In this paper a new chemical oscillating reaction in the pyruvic acid-BrO-H2SO4 - [CuL](ClO4)2 system, where L is 5, 7, 12, 14-tetraethyl-7, 14-dimethyl-1, 4, 8, 11 -tetraazacyclotetradeca-4, 11-diene, is reported. The features of the oscillations are studied in detail. The effects of Ag+,Hg2+,CCl4, Vc, H2O2, acrylonitrile, and temperature on the oscillation system are also discussed.
文摘融合绿色化学理念,创新基础化学实验蒽与马来酸酐Diels-Alder的反应与重结晶条件,设计采用无毒、水溶性、高沸点的二甘醇二甲醚作为蒽与马来酸酐Diels-Alder反应的溶剂,重结晶体系为二甘醇二甲醚—石油醚混合溶剂。产物经熔点、红外(IR)光谱和核磁共振氢谱(1 H NMR)分析表征。采用气相扩散方法培养单晶,产物的晶体结构经X-射线单晶衍射分析。实验方法具有绿色、环保、反应条件温和、后处理简便、收率高等特点,整个实验体系综合性强。
