Abstract
By using the sol-gel process, colloids are prepared by the spontaneous reduction of silver ions, where the presence or absence of ethanol plays an important role. Thermochromic properties are observed in these gels in the temperature range between 15°C and 150°C. In the UV-Vis region the transmission spectrum red shift of the cut-off is employed to study these properties as a function of the temperature; a shift from 300 to 750 nm is observed. Originally, a broad shoulder centered at 435 nm is seen in gels prepared in the absence of ethanol and at 425 nm with ethanol, corresponding to surface plasmon resonances of the small silver particles in the colloids. These particles are responsible for the various colors observed in the gels. Additionally, the influence of temperature on the color stability, as well as on the influence shown by ethanol on the rate of displacement of the transmission cut-off wavelength, are studied.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
