Effect of Microwave Irradiation on the Microstructural Properties of Bivoltine Silk Fibroin Films

Mahadevaiah, .; Urs, G. Thejas; Byrappa, K.; Somashekar, R.

doi:10.1016/j.proeng.2015.08.1110

Cited by 1 publication

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“…Upon removal of this sericin through washing and chemical treatment, the recrystallisation of fibroin takes place. The resulting regenerated silk appears to be more optically active and exhibits RSA due to the 3D reorientation of fibroin protein as the film [28]. The reverse saturable absorption behaviour of regenerated silk is reported previously by Lee et al [29] for spin-coated silk films, but no reports state the inherent properties of silk that exist as natural fibres.…”

Section: Resultsmentioning

confidence: 66%

Investigation on optical switching behaviour of regenerated and non-regenerated silk by nanosecond Z-scan technique

Gowtham¹,

Urs²,

Raghavendra³

et al. 2021

Phys. Scr.

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The nonlinear optical behaviour of silk, a natural fibre, is investigated in this study. We have considered silk in the cocoon, fibre and film forms of bivoltine and multivoltine breeds. The nonlinear absorption and optical limiting studies were performed using the open aperture Z-scan technique at 1064nm. Interestingly, silk in cocoon and fibre form possess saturable absorption (SA), whereas silk in the film form exhibits reverse saturable absorption (RSA). This shift is attributed to the removal of sericin during the regeneration of silk into a film. Further, silk films exhibit optical limiting behaviour, whose limiting thresholds are in the order of 1012 W/cm2. Functional data analysis (FDA), a statistical approach, is employed to draw correlations amongst physical parameters. FDA offers good insight into the dependencies between silk varieties and their optical parameters. This helps in identifying the sample possessing the best properties.

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Section: Resultsmentioning

confidence: 66%