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2001 (1)
2000 (1)
1Author    Bożenna Różycka-Roszak, Hanna PruchnikRequires cookie*
 Title    Effect of Counterions on the Influence of Dodecyltrimethylammonium Halides on Thermotropic Phase Behaviour of Phosphatidylcholine Bilayers  
 Abstract    Effects of dodecyltrimethylammonium chloride (DTAC), dodecyltrimethylammonium bro­ mide (D T A B) and dodecyltrimethylammonium iodide (D T A I) on thermotropic phase behav­ iour of phosphatidylcholine bilayers as well as on !H NM R spectra were studied. In order to enhance the effect of counterions on water structure two series of experiments were per­ formed. In the first one the surfactants were added to the water phase and in the other one directly to lipid phase (a mixed film was formed). The effects o f particular surfactants on the main phase-transition temperature were more pronounced when they were added to the water phase (1st method) instead of the lipid phase (2nd method). Furthermore, in the case of the first method the transitions were found asymmetrical while in the second method nearly symmetrical. It is suggested that surfactant-poor and surfactant-rich domains are formed when surfactants are added to the water phase. 
  Reference    Z. Naturforsch. 55c, 240 (2000); received Novem ber 5/D ecem ber 15 1999 
  Published    2000 
  Keywords    Counterions, Dodecyltrimethylammonium Halides, Phase Behaviour, Phosphatidylcholine Bilayers 
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 TEI-XML for    default:Reihe_C/55/ZNC-2000-55c-0240.pdf 
 Identifier    ZNC-2000-55c-0240 
 Volume    55 
2Author    Swathi Pisupati, P. A. Kumar, V.G K M PisipatiRequires cookie*
 Title    Induced Smectic-G Phase through Intermolecular Hydrogen Bonding Part IX: Comparative Thermal and Phase Behaviour Studies on Two Distinct Structural Isomers Possessing Linear and Bow Shapes  
 Abstract    Two novel intermolecular hydrogen bonding mesogenic series comprising two distinct structural iso­ mers nABA:R:nABA and «ABA:H:«ABA (where R = resorcinol; H = hydroquinone; nABA = p-n-al-kyloxybenzoic acid with the alkyl carbon number varying from propyl-to decyl-and dodecyl-) have been synthesized using resorcinol and hydroquinone as central bent and linear cores, respectively. The thermal and phase behaviour of these complexes is studied by thermal microscopy and differential scan­ ning calorimetry. The IR spectral data confirm the formation of intermolecular hydrogen bonding between the OH group of the non-mesogen and -COOH group of the nABA moiety. Thermal studies reveal the existence of new phases: smectic-A and smectic-G. Comparative phase transition studies sug­ gest that these isomers exhibit a different trend of mesomorphism. 
  Reference    Z. Naturforsch. 56a, 692—696 (2001); received July 4 2001 
  Published    2001 
  Keywords    Hydrogen Bonding, Thermal, Phase Behaviour, rtABA:R:rcABA, nABA:H:rcABA 
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 TEI-XML for    default:Reihe_A/56/ZNA-2001-56a-0692.pdf 
 Identifier    ZNA-2001-56a-0692 
 Volume    56