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Thursday, May 7, 2020 | History

3 edition of Infrared spectroscopy of phase transitions in Langmuir monolayers found in the catalog.

Infrared spectroscopy of phase transitions in Langmuir monolayers

Joseph Thomas Buontempo

Infrared spectroscopy of phase transitions in Langmuir monolayers

by Joseph Thomas Buontempo

  • 318 Want to read
  • 30 Currently reading

Published .
Written in

    Subjects:
  • Phase transformations (Statistical physics),
  • Monomolecular films.

  • Edition Notes

    Statementby Joseph Thomas Buontempo.
    Classifications
    LC ClassificationsMicrofilm 94/2458 (Q)
    The Physical Object
    FormatMicroform
    Paginationvii, 183 leaves
    Number of Pages183
    ID Numbers
    Open LibraryOL1241909M
    LC Control Number94628663

    Abstract. Fourier transform infrared (FTIR) spectroscopy is a powerful, nonperturbing technique that has been used to good effect for the detection and characterization of lipid phase transitions in Cited by:   Some fatty acids, lipids, polymers and mesogenic molecules which are amphiphilic in nature spread at the air-water interface to form stable Langmuir monolayers. They exhibit a rich variety of two-dimensional (2D) phases. In this article, we briefly review some of the novel features we have found in these monolayers. For example, we find transition Cited by: 4.

    Anisotropic aggregation and phase transition in Langmuir monolayers of methyl/ethyl esters of 2,3-dihydroxy fatty acids Article in Journal of Colloid and Interface Science (2) June. Topics: Chemistry, Physical, Reflection-absorption Ft-ir Spectroscopy, Monolayers, Ft-ir Spectra, Vinyl Octadecanoate Monolayers, Vinyl Stearate Monolayers, Monolayer Structure By Ft-ir, Air-water-interface, Surface-pressure-gradients, Normal-alkyl Chains, H Stretching Modes, Phase-transitions, Phospholipid Monolayers, Infrared-spectroscopy, Langmuir Monolayers Author: B. F. Sinnamon, R. A. Dluhy and G. T. Barnes.

      Infrared reflection–absorption spectroscopy (IRRAS) 20 is used to study the thin films and needs to be performed on a reflective substrate. 21 Due to the surface selection rule, the phase Cited by: 2. This thesis deals with the studies on the phase transitions, stability, complex formation, and the molecular aggregations in the Langmuir monolayer and Langmuir-Blodgett lms of mesogenic and organometallic amphiphilic molecules. A single layer of insoluble amphiphilic molecules spread at the air-water (A-W) interface is called a Langmuir Author: Raj Kumar Gupta.


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Infrared spectroscopy of phase transitions in Langmuir monolayers by Joseph Thomas Buontempo Download PDF EPUB FB2

Transmission infrared spectroscopy has been used to probe the structure of alkanethiolate monolayers adsorbed onto nanometer-sized gold clusters. The alkyl chain lengths vary between propanethiolate Cited by: We report the results of an infrared external reflection spectroscopic study of phase transitions in Langmuir monolayers of heneicosanol.

One of our main goals was to examine monolayers which were pure and at equilibrium. The monolayers Cited by: Ellipsometry measures the relative intensity of and the phase difference between the parallel and perpendicular components of a polarized electric field vector interacting with a sample.

In this paper, a technique using polarized Fourier transform infrared spectroscopy Cited by: Orthorhombic structure of cadmium behenate monolayers on the water surface of a Langmuir trough detected by polarization modulation infrared spectroscopy.

Chemical Physics Letters, Cited by: Infrared and Raman spectroscopies are now currently used to obtain molecular information (orientation, conformation, organization) on monolayers at the air–water interface. In the past year, several original studies were performed on peptides and proteins and their interaction with phospholipidic by: There is a steadily growing body of evidence that much of the information available concerning the properties of Langmuir monolayers concerns systems which are not in a state of equilibrium.

What are now known to be unrelaxed monolayers of stearyl alcohol exhibit a high surface pressure phase transition Cited by: The majority of the IR spectroscopic work to date has been in conformational analysis and characterization of phase transitions in model monolayers 9, 10, but there have also been several studies on naturally isolated pulmonary surfactant, cation interactions with monolayer head gro 13, soluble ionic surfactants and peptide monolayer films.

This paper reports on some recent work from our laboratory on two additional aspects of IR spectroscopy of Langmuir monolayers: polarized IR Cited by: Infrared spectroscopic studies of structure and phase transitions in a Langmuir monolayer of H(CH 2) 23 COOHCited by: 6.

Infrared External Reflection Spectroscopy of Sodium Dodecyl Sulfate Monolayers at the Air−Solution Interface: Removal of Bulk-Phase Water Concentration Effects. Langmuir14 Cited by: This desorption transition can be termed a pancake−mushroom transition.

The origin of the second plateau regime is more uncertain. A Systematic Infrared Reflection−Absorption Spectroscopy and Film Balance Study of the Phase Behavior of Lipopolymer Monolayers at the Air−Water Interface - Langmuir Cited by: A recent extension of the above approach is the technique of phase modulated infrared reflection absorption spectroscopy (PM-IRRAS).

37, 38 In this experiment, a photoelastic modulator (PEM) that induces a high frequency polarization modulation of the infrared beam. A two step melting process in Langmuir–Blodgett (LB) monolayer assemblies of cadmium arachidate (CdA) has been studied by infrared spectroscopy in conjunction with thermal measurements.

These Cited by: Anisotropic aggregation and phase transition in Langmuir monolayers of methyl/ethyl esters of 2,3-dihydroxy fatty acids on the basis of the FT-IR spectroscopy data.

The enthalpy change of the LE–LC phase transition Cited by: 4. Surface-sensitive sum-frequency vibrational spectroscopy (SFVS) has grown into a most viable analytical tool to investigate Langmuir monolayer systems. Content: Fourier transform infrared spectroscopy in colloid and interface science: an overview / David R.

Scheuing -- CD₂ rocking modes as quantitative Fourier transform infrared spectroscopic probes of conformational disorder in phospholipid bilayers / Richard Mendelsohn and Mark Allen Davies -- Pressure tuning Fourier transform infrared and Raman spectroscopy.

Thermodynamics of Phase Transitions in Langmuir Monolayers Observed by Vibrational Sum Frequency Spectroscopy Marc C. Gurau, Edward T. Castellana, Fernando Albertorio, Sho Kataoka. some SC lipids and promoted phase separation in SC lipids. Infrared spectroscopy (IR) is a technique that measures the frequencies of molecular vibrations.

The IR spectrum is usually divided into three regions: near-IR ( um wavelength), mid-IR ( um wavelength) and far-IR File Size: 1MB. Abstract We report the results of linked theoretical and experimental studies of external infrared reflectivity by a Langmuir monolayer.

The new feature in our analysis is the inclusion of the influence of the factor group splitting, arising from the presence of two molecules in the unit cell of a close packed two-dimensional monolayer lattice (CS phase.

The infrared reflection-absorption spectroscopy (IRRAS) and Brewster angle microscopy (BAM) of β-galactosidase Langmuir monolayer was also investigated for pure and mixed β-galactosidase at the.

Polarization modulation infrared reflection absorption spectroscopy (PM-IRRAS) was applied to investigate the structure of behenic acid monolayers on the surface of aqueous Cd2+ sub-phase in a. The vibrational excitation energy of molecules is in the range of 10 13 –10 14 Hz, which corresponds to infrared radiation.

5 This means that IR spectroscopy can be used to observe the vibrational transitions. The liquid-expanded (LE) to liquid condensed (LC) phase transition of monomolecular films of 1,2-dipalmitpolsn-glycerophosphocholine (DPPC) on water substrates was examined via single reflectance FT-IR Spectroscopy Cited by: 1.Polarization modulation infrared reflection absorption spectroscopy (PM-IRRAS) was applied to investigate the classical CH3(CH2)(n)COOH/Cd2+ system (abbreviated as CdSt, CdA, and CdB for n .