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Volumn 22, Issue 10, 2006, Pages 4457-4461

Dewetting instability during the formation of polymersomes from block-copolymer-stabilized double emulsions

Author keywords

[No Author keywords available]

Indexed keywords

DOUBLE EMULSION DROPLETS; PARTIAL WETTING; POLYMER VESICLES; POLYMERSOMES;

EID: 33744816176     PISSN: 07437463     EISSN: None     Source Type: Journal    
DOI: 10.1021/la060094b     Document Type: Article
Times cited : (151)

References (48)
  • 10
    • 33744809632 scopus 로고    scopus 로고
    • note
    • PEO is known to form aggregates in toluene (see ref 11), so solutions were warmed to ∼35°C before using. This was found by dynamic light scattering to break up any aggregates in solution.
  • 15
    • 33744781635 scopus 로고    scopus 로고
    • note
    • The organic solvent used as the middle phase is also important: dewetting takes place when the organic solvent is purely toluene, whereas, with pure chloroform, rupture and coalescence of the inner and outer aqueous phases is always seen. The PS-PEO diblock copolymer is not as effective as a surfactant at the water-chloroform interface as it is at the water-toluene interface, presumably because of the high solubility of PEO in chloroform (ref 16).
  • 18
    • 33744800628 scopus 로고    scopus 로고
    • note
    • i due to the presence of PVA at the external interface and the compression of the outer interface during solvent evaporation. As a result, the numerical factor in eq 2 should be somewhere between 1 and 2.
  • 23
    • 33744780013 scopus 로고    scopus 로고
    • note
    • Toluene and chloroform are good solvents for both the PS and PEO blocks; therefore, we do not expect the PEO block to be collapsed in solution.
  • 33
    • 33744798325 scopus 로고    scopus 로고
    • note
    • g = 4.9 nm used in calculating the magnitude of depletion effects.
  • 35
    • 33744826641 scopus 로고    scopus 로고
    • note
    • While the driving force for spontaneous emulsification in this system is not well understood, the phenomenon is observed for all polymers considered here, and other groups have reported the same behavior in similar systems (see refs 36 and 37).
  • 38
    • 33744818678 scopus 로고    scopus 로고
    • note
    • The limiting value of γ varies somewhat between measurements (± 0.5 mN/m) but does not depend strongly on block copolymer concentration in the range of 0.01-1 wt %.
  • 39
    • 33744784385 scopus 로고    scopus 로고
    • note
    • The presence of PVA at the outer oil-water interface may also be important during solvent evaporation from double emulsion drops. However, compression isotherms with both PVA and PS-PEO present indicate that PS-PEO dominates the surface behavior.
  • 47
    • 33744797754 scopus 로고    scopus 로고
    • note
    • adh = 0.001 mN/m. This is much smaller than the characteristic values of γ on the order of 1 mN/m, as well as the estimated magnitude of the depletion interaction. However, the observation of vanishing interfacial tension means that even van der Waals forces may be large enough to drive dewetting under some conditions.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.