在用高压脉冲电场(pulsed electric field,PEF)技术处理食品的过程中,脉冲电流通过电极-液体表面,引起电化学反应,导致电极腐蚀,从而影响到食品安全和设备运行。利用加速腐蚀实验研究了高压脉冲电场作用下的电极腐蚀规律,重点考察了不...在用高压脉冲电场(pulsed electric field,PEF)技术处理食品的过程中,脉冲电流通过电极-液体表面,引起电化学反应,导致电极腐蚀,从而影响到食品安全和设备运行。利用加速腐蚀实验研究了高压脉冲电场作用下的电极腐蚀规律,重点考察了不同电压幅值、脉宽和溶液电导率对电极腐蚀的影响;测试了溶液中电极材料钛离子质量浓度,以定量表征电极腐蚀程度;得到了腐蚀速度随时间的变化关系曲线。结果表明:PEF作用下电极腐蚀特性可以用传统电路模型来解释;随着电场强度由16.7 kV/cm逐步升至41.7 kV/cm、脉宽由5μs逐步升至20μs,溶液电导率由1μS/cm逐步升至600μS/cm,腐蚀会逐渐加剧,钛离子质量浓度分别由0.466μg/L至2.085μg/L、由0.4μg/L至4.855μg/L和由0.8μg/L至43.4μg/L依次上升;腐蚀由电极表面边缘倒角部分开始逐步向中心区域发展;腐蚀后电极在空气中放置氧化一段时间可使加电时腐蚀速度减慢。最后通过研究电极腐蚀规律提出了抑制或者减少腐蚀的措施。展开更多
Metallic electrode pairs with angstrom or nano-scale gap play a key role in studying the electron transport in molecular electronic and nano-electronic devices. Here we report a novel method of electrochemical etching...Metallic electrode pairs with angstrom or nano-scale gap play a key role in studying the electron transport in molecular electronic and nano-electronic devices. Here we report a novel method of electrochemical etching to prepare gold electrode pairs. By adjusting the parameter of the homemade feedback loop and the etching voltage,a series of electrode pairs with different sizes of gap were fabricated. The process is simple and dispenses with special equipments. This method also has the potential for fabricating other metallic electrode pair with a controlled gap distance.展开更多
The inhibition of N,N′ dibenzothioxalamide(DBT) against copper in chloride and perchlorate solutions respectively has been investigated by using slow potentiodynamic polarization and ac impedance measurements.It show...The inhibition of N,N′ dibenzothioxalamide(DBT) against copper in chloride and perchlorate solutions respectively has been investigated by using slow potentiodynamic polarization and ac impedance measurements.It shows that DBT is a better inhibitor of against the copper corrosion in perchlorate solutions than in chloride solutions.展开更多
文摘在用高压脉冲电场(pulsed electric field,PEF)技术处理食品的过程中,脉冲电流通过电极-液体表面,引起电化学反应,导致电极腐蚀,从而影响到食品安全和设备运行。利用加速腐蚀实验研究了高压脉冲电场作用下的电极腐蚀规律,重点考察了不同电压幅值、脉宽和溶液电导率对电极腐蚀的影响;测试了溶液中电极材料钛离子质量浓度,以定量表征电极腐蚀程度;得到了腐蚀速度随时间的变化关系曲线。结果表明:PEF作用下电极腐蚀特性可以用传统电路模型来解释;随着电场强度由16.7 kV/cm逐步升至41.7 kV/cm、脉宽由5μs逐步升至20μs,溶液电导率由1μS/cm逐步升至600μS/cm,腐蚀会逐渐加剧,钛离子质量浓度分别由0.466μg/L至2.085μg/L、由0.4μg/L至4.855μg/L和由0.8μg/L至43.4μg/L依次上升;腐蚀由电极表面边缘倒角部分开始逐步向中心区域发展;腐蚀后电极在空气中放置氧化一段时间可使加电时腐蚀速度减慢。最后通过研究电极腐蚀规律提出了抑制或者减少腐蚀的措施。
文摘Metallic electrode pairs with angstrom or nano-scale gap play a key role in studying the electron transport in molecular electronic and nano-electronic devices. Here we report a novel method of electrochemical etching to prepare gold electrode pairs. By adjusting the parameter of the homemade feedback loop and the etching voltage,a series of electrode pairs with different sizes of gap were fabricated. The process is simple and dispenses with special equipments. This method also has the potential for fabricating other metallic electrode pair with a controlled gap distance.
文摘The inhibition of N,N′ dibenzothioxalamide(DBT) against copper in chloride and perchlorate solutions respectively has been investigated by using slow potentiodynamic polarization and ac impedance measurements.It shows that DBT is a better inhibitor of against the copper corrosion in perchlorate solutions than in chloride solutions.
