[1]黄玉华,葛艳艳,沙菁洁,等.锥形玻璃纳米孔中溶液浓度和pH值对整流的影响[J].东南大学学报(自然科学版),2014,44(3):526-530.[doi:10.3969/j.issn.1001-0505.2014.03.014]
 Huang Yuhua,Ge Yanyan,Sha Jingjie,et al.Effects of salt concentration and pH value on ion rectification of conical glass nanopore[J].Journal of Southeast University (Natural Science Edition),2014,44(3):526-530.[doi:10.3969/j.issn.1001-0505.2014.03.014]
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锥形玻璃纳米孔中溶液浓度和pH值对整流的影响()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
44
期数:
2014年第3期
页码:
526-530
栏目:
自动化
出版日期:
2014-05-16

文章信息/Info

Title:
Effects of salt concentration and pH value on ion rectification of conical glass nanopore
作者:
黄玉华1葛艳艳2沙菁洁1刘磊1章寅1陈云飞1
1东南大学机械工程学院, 南京 211189; 2南京农业大学工学院, 南京 210031
Author(s):
Huang Yuhua1 Ge Yanyan2 Sha Jingjie1 Liu Lei1 Zhang Yin1 Chen Yunfei1
1School of Mechanical Engineering, Southeast University, Nanjing 211189, China
2College of Engineering, Nanjing Agricultural University, Nanjing 210031, China
关键词:
浓度 pH值 整流 玻璃纳米孔
Keywords:
concentration pH value rectification glass nanopore
分类号:
TP211.3
DOI:
10.3969/j.issn.1001-0505.2014.03.014
摘要:
为了探索锥形纳米孔整流的机理,以硼硅酸盐玻璃毛细管为材料,采用微电极拉制仪P-2000拉制了内径20~50 nm的玻璃锥形纳米孔.孔内注满氯化钠盐溶液后,采用膜片钳对该类纳米孔的整流效应进行了实验研究.实验发现,锥形玻璃纳米孔的整流比随浓度先增大后减小,在溶液浓度为10~50 mmol/L范围内出现最大整流比.当溶液pH值高于玻璃等电点时,随着溶液pH值的增大,整流比随之增大;当溶液pH值低于玻璃等电点时,玻璃表面发生壁面电荷倒置,整流方向发生改变.实验结果表明,玻璃锥形纳米孔整流效应受到溶液浓度和溶液pH值共同影响,纳米孔内壁不经过任何化学修饰就可以发生电荷倒置.
Abstract:
In order to explore the mechanism of the conical nanopore rectification, glass conical nanopores were fabricated with boron silicate glass capillary on micropipette puller system P-2000. The nanopores’ diameter ranged from 20 to 50 nm. After the pore was filled with sodium chloride solution, the rectification effect of the pore was experimentally studied with a patch clamp. It is found that the rectification ratio of the nanopore shows an increase and then decrease trend as the solution concentration becomes higher, and the highest rectification ratio appears when the salt concentration is between 10 and 50 mmol/L.When the pH is above the isoelectric point of glass, the rectification ratio increases as the solution pH increases. When the pH is below the isoelectric point of glass, the surface of the glass exhibits charge inversion and the rectification direction changes. The results show that conical nanopore rectification can be influenced both by salt concentration and pH value, and charge inversion can occur on the surface of glass without any chemical modification.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期: 2013-11-26.
作者简介: 黄玉华(1989—),男,硕士生;陈云飞(联系人),男,博士,教授,博士生导师,yunfeichen@seu.edu.cn.
基金项目: 国家重点基础研究发展计划(973计划)资助项目(2011CB707601,2011CB707605).
引用本文: 黄玉华,葛艳艳,沙菁洁,等.锥形玻璃纳米孔中溶液浓度和pH值对整流的影响[J].东南大学学报:自然科学版,2014,44(3):526-530. [doi:10.3969/j.issn.1001-0505.2014.03.014]
更新日期/Last Update: 2014-05-20