ATOMIC FORCE MICROSCOPY INSPECTION OF LANGMUIR-BLODGETT FILMS OF CALIX[4]PYRROLE SUITABLE FOR OPTICAL RECOGNITION OF ALCOHOL VAPOURS
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P. L. Timms, J. Chem. Soc. D, 1969, 1033a DOI: 10.1039/C2969001033A
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Abstract Frictional effects in atomic force microscopy (AFM) of Langmuir‐Blodgett films of 1, 2‐dipalmitoyl‐snglycero‐phosphoglycerol were examined. Height measurements of the Langmuir layers are strongly influenced by the orientation of the cantilevers used in AFM relative to the sample. A simple model is used to describe the frictional effects and to calculate the real height of the monolayers.
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(1855). II. On the elastic forces of vapours in vacuo and in gases, at different temperatures; and on the tensions of the vapours furnished by mixed or superposed liquids . The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science: Vol. 9, No. 56, pp. 4-25.
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(1854). XXXV. On the elastic forces of vapours in vacuo and in gases, at different temperatures; and on the tensions of the vapours furnished by mixed or superposed liquids. The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science: Vol. 8, No. 52, pp. 269-280.
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Most gases and vapours with a bipolar molecular structure absorb infrared energy. If such a gas is interposed between an object emitting infrared radiation and a thermocamera the gas will absorb some of the infrared radiation and thus cast a shadow on the thermocamera picture. In this assay it is possible to visualise the gas. This method had been used to study pollution with anaesthetic gases and vapours in operating theatres. The vapours of other chemicals used in hospitals and other places of work also have been studied. The method permits the study of dispersion and flow patterns of polluting gases and vapours during work.
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A new method of determining experimentally the magnetic susceptibilities of gases and vapours is described. Compensation is effected for the test bulbs, and the influence of surface condensation, if any, of gases and vapours can be allowed for and separately investigated. Electromagnetic retorsion is employed and the arrangement is rendered independent of small changes in the magnetizing current. The molar susceptibility of carbon dioxide was found to be -(20.79 ± 0.08) × 10-6, showing good coincidence with the values of other investigators. The arrangement is being improved in several directions to give much greater accuracy. A systematic investigation of many gases and vapours will then be undertaken.
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A controlled vapours generator of explosives compounds has been evaluated for delivering low-concentrated vapours in order to determine the threshold of quartz crystal microbalances based chemical gas sensors.
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