Optical constants of a sodium alginate polymer in the UV–vis range

✍ Scribed by Ó. Esteban; F. Marvá; J.C. Martínez-Antón

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 338 KB
• Volume: 31
• Category: Article
• ISSN: 0925-3467
• DOI: 10.1016/j.optmat.2008.08.003

✦ Synopsis

The dispersive refractive index and the thickness of alginate polymer films have been obtained by using the envelope-extremes location technique. The uncertainty in the determination of the refractive index is of the order of 0.01. The alginate polymer has been prepared with a solution of sodium alginate with a concentration of 0.7% in weight, mixed with a 0.03 M solution of CaCl 2 . Since the main application of this kind of polymers is the immobilization of living organism for biosensors, especially those based on fluorescence measurements, we focus the analysis in the ultra-violet-visible (UV-vis) spectral range.