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Volumn 300, Issue 5618, 2003, Pages 460-464

On the origins of morphological complexity in block copolymer surfactants

Author keywords

[No Author keywords available]

Indexed keywords

BLOCK COPOLYMERS; LIPIDS; MICELLES; MICROEMULSIONS; MOLECULAR WEIGHT; SELF ASSEMBLY; TRANSMISSION ELECTRON MICROSCOPY;

EID: 0037453427     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.1082193     Document Type: Article
Times cited : (1092)

References (32)
  • 5
    • 0033553661 scopus 로고    scopus 로고
    • B. M. Discher et al., Science 284, 1143 (1999).
    • (1999) Science , vol.284 , pp. 1143
    • Discher, B.M.1
  • 18
    • 0242484329 scopus 로고    scopus 로고
    • note
    • PEE = 46, where PEE refers to poly(ethylethylene). However, almost all branching, including starfish-like structures, was generated by PEO.
  • 20
    • 0242484328 scopus 로고    scopus 로고
    • note
    • The tendency toward mirror symmetry and the associated explanation based on local free-energy equilibration remains valid in the limit of thin-film confinement.
  • 23
    • 0242568308 scopus 로고    scopus 로고
    • note
    • The fluid character of the diblock copolymers also provides a mechanism for relaxing stress within curved loop sections. Excess diblock copolymer can move to the outer portion of a looped cylinder, thereby accommodating the extra surface area without unfavorable chain stretching or compression.
  • 24
    • 0242484327 scopus 로고    scopus 로고
    • note
    • Loops can be eliminated by shrinkage to the point of fusion or cleavage of a cylindrical section or Y-junction in a closed loop. Both mechanisms are inconsistent with the tendency to increase the number of Y-junctions and the absence of linear (as opposed to looping) cylindrical sections in the quiescent partides (Fig. 2, B and C, and Fig. 3). The most likely transition mode for long cylindrical loops is to produce a spherical cap, which may fuse with cylindrical segments (looped or linear), similar to the theoretical mechanism proposed by Tlusty et al. (13). This sequence would account for the growth of a macroscopic three-dimensional network during particle consolidation under the influence of gravity. Agitation can disrupt this fragile network, breaking off pieces that contain specific topologies dictated by the number of closed loops.
  • 32
    • 0242568307 scopus 로고    scopus 로고
    • note
    • This research program was supported by the NSF-sponsored Materials Science and Engineering Center (MRSEC) at the University of Minnesota and by the NIH (1R21EB00989-01). D. Morse engaged the authors in enlightening discussions.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.