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Browsing Chemistry by Author "Ungar, G."

Browsing Chemistry by Author "Ungar, G."

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  • Chain tilt and surface disorder in lamellar crystals. A FTIR and SAXS study of labeled long alkanes 
    de Silva, D.S.M.; Zeng, X.; Ungar, G.; Spells, S.J. (Macromolecules, 2002)
    Small-angle X-ray scattering (SAXS) and infrared spectroscopy (IR) are employed in a study of chain tilt and disorder in solution-crystallized long alkanes C198H398 and C12D25C192H384C12HD24 in extended and once-folded ...
  • Dilution wave and negative-order crystallization kinetics of chain molecules 
    Ungar, G.; Mandal, P.K.; Higgs, P.G.; de Silva, D.S.M.; Boda, E.; Chen, C.M. (Physical Review Letters, 2000)
    We show that the crystal growth rate of a very long-chain n-alkane C198H398 from solution can decrease with increasing supersaturation and follow strongly negative order kinetics. The experimental behavior can be well ...
  • The effects of self-poisoning on crystal morphology and growth rates 
    Ungar, G.; Putra, E.G.R.; de Silva, D.S.M.; Shcherbina, M.A. (Advances in Polymer Science, 2005)
    Recent extensive experimental work and the limited theoretical studies of the phenomenon of self-poisoning of the crystal growth face are reviewed. The effect arises from incorrect but nearly stable stem attachments which ...
  • Events at the growth face as revealed by concentration dependence of crystallization rate of long alkanes 
    Ungar, G.; Putra, E.G.R.; de Silva, D.S.M. (American Chemical Society, 2004)
    It is by now well known that monodisoerse n-alkanes, long enough to exhibit chain folding, show a minimum in crystal growth rate with increasing supercooling ΔT. The minimum occurs near the transition from extended-chain ...
  • Perpendicular and tilted chains in lamellar crystals 
    de Silva, D.S.M.; Zeng, X.B.; Ungar, G.; Spells, S.J. (Journal of Macromolecular Science-Physics, 2003)
    Chain tilt and surface disorder were investigated in end-deuterated long n-alkane C12D25C192H384C12HD24 crystallized from solution and in n-alkane C162H326 crystallized from melt. Small-angle X-ray scattering and infrared ...

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