Structures of lipid and biopolymer monolayers investigated as Langmuir-Blodgett films by atomic force microscopy

Birdi, K. S.; Vu, Dong; Moesby, L.; Andersen, Klaus B.; Kristensen, Dorthe

doi:10.1016/0257-8972(94)90118-x

Cited by 16 publications

(19 citation statements)

References 6 publications

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“…Ethanol was found to have large effects on the monolayers of some lipids (e.g., dipalmitoyl lecithin, stearic acid) but few effects on other lipids (oleic acid) (Birdi, 1999). This indicated that long-time adsorption of ethanol in films exists, only for solid films.…”

Section: Effect Of Solvents On Monolayer Filmsmentioning

confidence: 99%

“…3.21 (Birdi, 1999). The magnitude of resolution achievable is in the range of a fraction of 1 Å Obviously the size and shape of the probe tip will determine the lateral resolution.…”

Section: Description Of Microscopes Stm Apparatusmentioning

confidence: 99%

“…• Use of gold samples with steps of one layer of Au, or other commercially available grids • Use of lipid layers deposited as LB films • Use of macromolecules (Birdi et al, 1994b) with known dimensions Image analyses are very varied and cover a wide range of possibilities. Filtering techniques include both high and low frequency as well as two-dimensional Fourier transform filtering.…”

Section: Calibration and Image Analyses Of Stm And Afmmentioning

confidence: 99%

“…Using experimental values for the mean bond polarizabilities and calculating for the C-H and C-C bond wave functions, it was found (Salem, 1960;) that where d is in angstroms. (4.39) has not been exhaustively applied in the current literature (Salem, 1960;Ohki and Ohki, 1976;Sørensen, 1979, Chattoraj andBirdi et al, 1994b) to estimate the magnitude of the cohesive forces, in monolayers. (4.39) is obtained on the assumption that a hexagonal molecular close packing in such monolayers is present [an assumption generally accepted by various investigators in such structures (Salem, 1962a,b;Mingins et al, 1975;Ohki and Ohki, 1976;Birdi, 1976b;Chattoraj and Birdi, 1984)], which gives from the geometric relations Other kinds of geometric packing of molecules can be easily considered.…”

Section: The Van Der Waals Equation For Real Gases Ismentioning

confidence: 99%

“…4.48 shows that the collapsed film has broken up into islands under the mechanical handling (Birdi et al, 1994b). 4.48 shows that the collapsed film has broken up into islands under the mechanical handling (Birdi et al, 1994b).…”

Section: Self-assembly Collapsed Lipid Monolayersmentioning

confidence: 99%

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Self-Assembly Monolayer Structures of Lipids and Macromolecules at Interfaces

Birdi¹

2002

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PREFACEThe information that science can extract from molecules that are essential for the processes of life can lead to better understanding of those processes. In natural selection during evolution (both prebiotic and biotic), physicochemical forces have been featured. A specific class of molecules, the amphiphiles, in aqueous environments exhibit self-assembly properties at liquid and solid interfaces. Such properties when combined with other forces require a special analysis. Of the self-assembly properties of amphiphiles, one is the formation of monomolecular films at both liquid-air and solid-air interfaces. During the last few decades, much has been reported in the literature on the formation of insoluble self-assembly monolayer (SAM) films of lipids and macromolecules (synthetic polymers and biopolymers) on the surface of water or at oil-water interfaces.The phenomenon of monolayer self-assembly has attracted considerable attention as a means of controlling molecular structures at interfaces. Studies of monomolecular films have been found to provide much physicochemical information on a molecular scale, which is useful for understanding many industrial and biological phenomena. For instance, the information obtained from lipid monolayer studies has been useful in determining the forces that stabilize various SAM structures found in lipid bilayers, vesicles, biological cell membranes, virus-cell fusion, emulsions, foams and films, and other self-assemblies. Current texts generally devote a single chapter to the characteristics of spread monolayers on liquids, and a researcher may have to look up a few hundred references to determine the procedures needed to investigate or analyze a particular phenomenon. Furthermore, there is an urgent need at this time for a text that discusses the state of the art regarding the surface phenomena exhibited by lipids and biopolymers, as they are relevant to a wide variety of surface and interfacial processes. During the last decade, the study of SAMs on solid surfaces has been aided greatly by developments in scanning tunneling microscopy (STM) and atomic force microscopy (AFM).The purpose of this book is to bring the reader up to date with the most recent experimental and the theoretical developments in relation to SAMs at liquid and solid surfaces. It is my intention to lead the researcher through the vast literature in such a way that he or she will be able to pursue particular investigation with suitable guidance. Such investigations may be industrial (emulsions, foams, dispersions, enhanced oil recovery, nonlinear optics) or biological [lipid-phase transitions, vesicles (drug targeting); bilayers, membranes, ion transport through membranes, sensors] in nature. The treatment in different parts of the text is based on the fundamental concepts of classical thermodynamics of surfaces (interfaces), i.e., the Gibbs adsorption theory. A large amount of experimental data from the literature has been included and critically examined from a vii viii PREFACE theoretical viewpoint...

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Section: Effect Of Solvents On Monolayer Filmsmentioning

confidence: 99%

“…3.21 (Birdi, 1999). The magnitude of resolution achievable is in the range of a fraction of 1 Å Obviously the size and shape of the probe tip will determine the lateral resolution.…”

Section: Description Of Microscopes Stm Apparatusmentioning

confidence: 99%

Section: Calibration and Image Analyses Of Stm And Afmmentioning

confidence: 99%