权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Preparation and characterization of pH memorizable charged gel membranes

pH可记忆带电凝胶膜的制备及表征

基本信息

批准号：
13640581
负责人：
HIGA Mitsuru
金额：
$ 2.18万
依托单位：
Yamaguchi University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13640581/
关键词：
pH responsive Ion Transport Amphoteric Control Membrane Memory ベクトル

项目摘要

We describe the design and preparation of a novel pH-responsive charged membrane whose charge density has two values when it is immersed into low-pH and high-pH solutions, and can retain the values after immersing it into a salt solution of pH=5.5. A pH-memorizable amphotelic gel membrane was prepared by casting an acid solution of a mixture of poly(allylamine) and poly(vinyl alcohol) which contains 1 mol% of acrylic acid as copolymer component, and by crosslinking it in a glutaraldehyde solution^3. We also make a pH-memorizable composite membrane (PAP membrane). This membrane has a sandwich-like structure of a pH-memorizable layer and two positively-charged layers. The membrane was treated with two solutions of pH 1 and 13. After the treatments, the membrane potential was measured KC1 solutions of pH=5.5 at some time intervals. Ionic permeation through the membrane was also measured in a dialysis system consisting of the membrane and 0.01N NaNO_3 and 0.01N KC1 solutions. The catoin concentration change was measured by an ion selective electrode. The membrane potential shows that the potential after pH 1 and pH 13 treatments are -30mV and 30mV, respectively, and the values are almost constant for more than 170h in a salt solution of pH=5.5. This means that the membrane can "memorize" the pH state of the treatment solution even in a salt solution of pH=5.5. The permeability of Cl^- ion through the PAP membrane after the low-pH treatment was about 800 times larger than that of K^+ ion after the high-pH treatment. The membrane maintains the high-permeability of anions even in the solution of pH=5.5. The function of the membrane can be applied to ionic devices such as chemical valves in a chemical chips.

我们设计和制备了一种新型的pH响应带电膜，其电荷密度在浸入低pH和高pH溶液时具有两个值，并且在浸入pH=5.5的盐溶液后仍能保持该值。用含有1mol %丙烯酸的聚烯丙胺和聚乙烯醇混合物的酸溶液，在戊二醛溶液中交联，制备了ph可记忆的两性凝胶膜。我们还制作了ph可记忆复合膜（PAP膜）。这种膜具有一个可ph记忆层和两个带正电层的三明治状结构。用pH为1和13的两种溶液处理膜。处理后，每隔一段时间在pH=5.5的KC1溶液中测定膜电位。在由该膜和0.01N NaNO_3和0.01N KC1溶液组成的透析系统中，也测量了离子通过膜的渗透性。用离子选择电极测定钙离子浓度的变化。膜电位显示，pH 1和pH 13处理后的电位分别为-30mV和30mV，在pH=5.5的盐溶液中，该值在170h以上基本保持不变。这意味着即使在pH=5.5的盐溶液中，膜也可以“记住”处理溶液的pH状态。低ph处理后Cl^ +离子通过PAP膜的通透性是高ph处理后K^+离子的800倍左右。即使在pH=5.5的溶液中，膜也能保持阴离子的高通透性。膜的功能可以应用于离子器件，如化学芯片中的化学阀。