Langmuir films behavior of asymmetric glycerol dialkyl nonitol tetraether (GDNT) lipids at the air-water interface (temperature 19˚C ± 1˚C) investigated the stability of the mean ratio of Langmuir films for different spreading time prior to the transfer film. Floating monolayer films stability is an important parameter to obtain high-quality Langmuir-Blodgett films for their aplications. Hysteresis loop of the compression-decompression (μ-A) isotherms of Langmuir film GDNT used to analyze the thermodynamic stability of the monolayer films and its features. Langmuir films stability of tetraether lipid GDNT shown more stable at the time of spreading longer than a short time.
We report on the deposition by Langmuir-Blodgett process of monolayer Tetraether lipids fikns were transferred onto Silicon wafer substrates. Langmuir experiments were performed with the Langmuir trough from a commercial film balance (Riegler & Kirstein GmbH, Mainz, Germany) . The surface pressure was measured with a filter paper WiUiekny balance. The experiments were performed at a temperature of 19°C ± TC. The subphase was pure water. The Tetraetherlipid were dissolved in chloroform in concentration 1 mMol for the fikn balance experiments. EUipsometry Measurements show that the thickness and optical properties of monolayer films. The thickness by EUipsometry were represent a combined mean value of domains about 1,5 nm -4, 0 nm. The surface morphology with Atomic Force Microscoy (ATM) as results showed that in all fikns domains are present and that the thickness of the observed domains films varies between 2 nm and 5 nm. From all films the hydrophobically transferred showed the most homogeneous organization on the substrates. After transfer on hydrophilic and aminosilanisated surfaces the lipids are arranged in small islands on the substrates.
This study investigated the behavior and molecular organization of synthetic artificial mimic molecules that resemble the following tetraether lipids: di-O-hexadecyl-glycero-3-phosphatidyl-glycerol (DHGPG) and bis-4-dodecylphenyl-12-phosphate. These molecules were analyzed using Langmuir film balance, ellipsometry and atomic force microscopy. The monolayer Langmuir-Blodgett films of DHGPG and bis-4-dodecylphenyl-12-phosphate were stable on the solid surface silicon wafers. The ellipsometry and AFM results showed that monolayers Langmuir-Blodgett films of DHGPG and bis-4-dodecylphenyl-12-phosphate were present, and the thickness of the observed films varied from 1.2-5.0 nm.
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