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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Xu, Xiaozhou Du, Xuezhong Liao, Kylin |
| Description | Author Affiliation: Liao K ( Key Laboratory of Mesoscopic Chemistry (Ministry of Education), and School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, People's Republic of China.) |
| Abstract | The acid-base properties of nanoscopic water confined in the black soap films (BSFs), which were prepared from aqueous solutions of sodium dodecylsulphate (SDS) with the dye neutral red (NR) as a pH probe, were investigated using a combination of UV-vis and FTIR spectroscopy. For the SDS micellar solutions at pH 1.0-9.5 adjusted with HCl/NaOH solutions and at pH 9.4 with ammonium buffered solution, the aqueous core thicknesses in the corresponding BSFs ranged from 2.7 to 6.2 nm, and the nanoscopically confined water exhibits unusual buffer action resistant not only to acidic/alkaline solutions but also to standard buffer solution. In the heavily water-depleted confined zones, it is most likely that charge pairs in proton-transfer reactions could not be formed effectively and proton transfer was prohibited in the absence of sufficient solvating ability. Theoretical analyzes indicated that the buffer action of the nanoscopic water originated from the confinement effect of two charged surfaces of the BSFs. These results might inspire deeper understanding and further studies of biobuffering, enzyme superactivity, acid-catalyzed reactions, and Nafion fuel cell membranes. |
| ISSN | 00219797 |
| Issue Number | 2 |
| Volume Number | 341 |
| e-ISSN | 10957103 |
| Journal | Journal of Colloid and Interface Science |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2010-01-15 |
| Publisher Place | United States |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Chemical Phenomena Nanotechnology Water Chemistry Algorithms Ammonia Buffers Hydrochloric Acid Hydrogen-ion Concentration Micelles Models, Chemical Neutral Red Protons Sodium Dodecyl Sulfate Sodium Hydroxide Spectrophotometry Spectrophotometry, Ultraviolet Spectroscopy, Fourier Transform Infrared Journal Article Research Support, Non-u.s. Gov't Discipline Colloid & Interface Science |
| Content Type | Text |
| Resource Type | Article |
| Subject | Surfaces, Coatings and Films Colloid and Surface Chemistry Biomaterials Electronic, Optical and Magnetic Materials |
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