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| Content Provider | Royal Society of Chemistry (RSC) |
|---|---|
| Author | Kumar, Rakesh Raghavan, Srinivasa R. |
| Copyright Year | 2009 |
| Abstract | The creation of fluids with light-tunable rheological properties using simple, inexpensive chemicals has been a recent focus of our laboratory. Such fluids could be useful in applications ranging from sensors to microfluidic valves. Towards this end, we report in this paper a class of aqueous fluids that exhibit “photogelling”, i.e., a substantial (10 000-fold) increase in fluid viscosity upon exposure to light. Such an increase in viscosity is triggered by the light-activated growth of wormlike micelles in the sample. The key components in the above fluids are the zwitterionic surfactant, erucyl dimethyl amidopropyl betaine (EDAB) and the photoresponsive molecule, trans-ortho-methoxy-cinnamic acid (OMCA), both of which are commercially available. OMCA binds to EDAB, and when the two are combined at high (>2 : 1) OMCA : EDAB molar ratios, short cylindrical micelles are formed in aqueous solution. Upon irradiation by UV light (<400 nm), OMCA gets photo-isomerized to its cis form, which then desorbs from EDAB micelles. In turn, a transition from short to long, entangled micelles ensues. Support for the above mechanism is provided by ζ potential and small-angle neutron scattering (SANS) studies. The photogelling effect can be reversed by further addition of OMCA, allowing the sample to be cycled through high- and low-viscosity states. |
| Starting Page | 797 |
| Ending Page | 803 |
| Page Count | 7 |
| File Format | HTM / HTML PDF |
| ISSN | 1744683X |
| Volume Number | 5 |
| Issue Number | 4 |
| Journal | Soft Matter |
| DOI | 10.1039/b809452g |
| Language | English |
| Publisher | Royal Society of Chemistry |
| Access Restriction | Open |
| Subject Keyword | EDAB Viscosity Rheology Betaine Neutron diffraction OMCA Concentration Surfactant |
| Content Type | Text |
| Resource Type | Article |
| Subject | Chemistry Condensed Matter Physics |
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