Pramana | |
Small-angle neutron and dynamic light scattering study of gelatin coacervates | |
B Mohanty2  H B Bohidar12  P S Goyal1  V K Aswal1  | |
[1] Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India$$;School of Physical Sciences, Jawaharlal Nehru University, New Delhi 110 067, India$$ | |
关键词: Gelatin; coacervates; light scattering; neutron scattering.; | |
DOI : | |
学科分类:物理(综合) | |
来源: Indian Academy of Sciences | |
【 摘 要 】
The state of intermolecular aggregates and that of folded gelatin molecules could be characterized by dynamic laser light and small-angle neutron scattering experiments, which implied spontaneous segregation of particle sizes preceding coacervation, which is a liquid-liquid phase transition phenomenon. Dynamic light scattering (DLS) data analysis revealed two particle sizes until precipitation was reached. The smaller particles having a diameter of ∼ 50 nm (stable nanoparticles prepared by coacervation method) were detected in the supernatant, whereas the inter-molecular aggregates having a diameter of ∼ 400 nm gave rise to coacervation. Small-angle neutron scattering (SANS) experiments revealed that typical mesh size of the networks exist in polymer dense phase (coacervates) [1]. Analysis of the SANS structure factor showed the presence of two length scales associated with this system that were identified as the correlation length or mesh size, 𜉠= 10.6 Ã… of the network and the other is the size of inhomogeneities = 21.4 Ã…. Observations were discussed based on the results obtained from SANS experiments performed in 5% (w/v) gelatin solution at 60° C (𜉠= 50$ Ã…, ðœ = 113 Ã…) and 5% (w/v) gel at 28° C (𜉠= 47 Ã…, ðœ = 115 Ã…) in aqueous phase [2] indicating smaller length scales in coacervate as compared to sol and gel.
【 授权许可】
Unknown
【 预 览 】
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