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Volumn 130, Issue 6, 2009, Pages

From thermally activated to viscosity controlled fracture of biopolymer hydrogels

Author keywords

[No Author keywords available]

Indexed keywords

COLLOIDS; CRACK PROPAGATION; CRACKS; GELATION; POLYMERS;

EID: 60349103869     PISSN: 00219606     EISSN: None     Source Type: Journal    
DOI: 10.1063/1.3078267     Document Type: Article
Times cited : (32)

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    • Note
    • Hydrogels are poroelastic materials that can partially relax stresses through a slow, diffusive solvent flow (Refs.), characterized by a collective diffusion coefficient Dcoll ≃ 10-11 m s-2 (Ref.). This is precisely this solvent/chain motion that we compute and claim to account for dissipation in the process zone, extending over dact ≃100 nm ahead of the crack tip (Ref.). At velocities smaller than dact / Dcoll ≃100 μm s-1, however, poroelastic relaxation is expected to affect the wider zone of typical extension G0 /μ≃100 μm, where the chains are strongly stretched (Ref.). In the absence of the solvent reservoir provided by the wetted tip, solvent flow driven by the negative pressure in this region should induce drying of the crack lips; hence, a strong capillary tension (Ref.) counteracting inward succion. The fact that G is unaffected by the presence of the reservoir rules out any significant poroelastic effect in our experiments, possibly due to reduced diffusion in the strongly stretched zone.
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* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.