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Thermo-optic property; SHG; chitosan–alizarin complex; biomedical; applications.

The optical parameters including the refractive index (𝑛) and thermo-optic coefficient, TOC (d𝑛/d𝑇), the dielectric constant (𝜀) and its variation with temperature, and the thermal volume expansion coefficient (𝛽) and its variation with temperature of chitosan–alizarin yellow GG (CS–AY GG) complex were examined. The dn/dT and 𝜀- values for the polymer derivative were in the range −2.5 × 10⁻⁴ to 1.2 × 10⁻⁴° C⁻¹ and 2.2 to 2.3, respectively. The dn/dT values were larger than that of inorganic glasses such as zinc silicate glass (5.5 × 10⁻⁶° C⁻¹) and borosilicate glass (4.1 × 10⁻⁶° C⁻¹) and were larger than that of organic polymers such as polystyrene (−1.23 × 10⁻⁴ ° C⁻¹) and PMMA (−1.20 × 10⁻⁴ ° C⁻¹). The 𝜀-values are lower than optically estimated 𝜀-values of conventional polymer (3.00), aliphatic polyimide (2.5) and semi-aromatic polyamide (2.83). The obtained results of chitosan derivative are expected to be useful for optical switching and optical waveguide areas for devices of biomedical applications.

Nidhi Nigam¹ Santosh Kumar^{1 2} Pradip Kumar Dutta¹ Tamal Ghosh¹

1. Department of Chemistry, Motilal Nehru National Institute of Technology, Allahabad 211 004, India
2. Department of Chemistry, Coimbra University, Coimbra, Portugal

Published

October 2015

Manuscript received

18 May 2015

Accepted

16 June 2015