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Role of Microscopic Phase Separation in Gelation of Aqueous Gelatin Solutions


Pelc, Damjan; Marion, Sanjin; Požek, Miroslav; Basletić, Mario
Role of Microscopic Phase Separation in Gelation of Aqueous Gelatin Solutions // Soft matter, 10 (2014), 2; 348-356 doi:10.1039/C3SM52542B (međunarodna recenzija, članak, znanstveni)


Naslov
Role of Microscopic Phase Separation in Gelation of Aqueous Gelatin Solutions

Autori
Pelc, Damjan ; Marion, Sanjin ; Požek, Miroslav ; Basletić, Mario

Izvornik
Soft matter (1744-683X) 10 (2014), 2; 348-356

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Impedance spectroscopy; gelation; pulsed field gradient NMR; circular dichroism spectroscopy

Sažetak
Using a unique home-made cell for four-contact impedance spectroscopy of conductive liquid samples, we establish the existence of two low frequency conductivity relaxations in aqueous solutions of gelatin, in both liquid and gel state. A comparison with diffusion measurements using pulsed field gradient NMR, and circular dichroism spectroscopy, shows that the faster relaxation process is due to gelatin macromolecule self-diffusion. This single molecule diffusion is mostly insensitive to the macroscopic state of the sample, implying that we have a clear separation of gelatin molecules into a free and network-bound phase. Scaling relations for the self-diffusion indicate that the gelation process is not a percolative phenomenon, but is caused by aggregation of triple helices into a system-spanning fibre network.

Izvorni jezik
Engleski

Znanstvena područja
Fizika



POVEZANOST RADA


Projekt / tema
119-1191458-1022 - Mikrovalna istraživanja novih materijala (Miroslav Požek, )
119-1191458-1023 - Sustavi s prostornim i dimenzijskim ograničenjima: korelacije i spinski efekti (Amir Hamzić, )

Ustanove
Prirodoslovno-matematički fakultet, Zagreb

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus
  • MEDLINE


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