Manipulation of insoluble films at an oil/water interface

Blight, L.; Cumper, C. W. N.; Kyte, V

doi:10.1016/0095-8522(65)90020-6

Cited by 18 publications

(1 citation statement)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Pressure-area (n-A) characteristics of monolayers were obtained by injecting solutions of the compounds on to the surface of water in a continuous barrier trough of the type described by Blight et a1. 8 The trough was thermostatically controlled through a metal base plate and the whole apparatus was located on vibration-damping mounts. Water in the trough was purified by percolation through reverse osmosis, activated carbon and mixed-bed deionisation cartridges and buffered at pH 5.8 k 0.1 for most experiments.…”

Section: Film Preparation and Characterisationmentioning

confidence: 99%

Chiral sulphur-containing molecules in Langmuir–Blodgett films

Georges¹,

Lewis²,

Llewellyn³

et al. 1988

J. Chem. Soc., Faraday Trans. 1

View full text Add to dashboard Cite

Long, straight alkane chains have been functionalised with sulphurcontaining groups at the chain-end, near the chain-end and at the midchain. The behaviour of such compounds in Langmuir films has been investigated. Several gave stable monolayers from which molecular areas have been determined. Surface potential (A V ) measurements carried out simultaneously with the pressure-area (n-A) isotherms provided an important insight into the surface behaviour of some of the compounds. On compression, changes in the A V-A characteristics were clearly visible, well before any significant changes occurred in the n-A curves. New evidence presented here suggests also that the previous interpretation of the n-A behaviour of CloH21SO(CH2),oC02H in terms of molecular orientation was incorrect, dissolution of the monolayer in the water subphase at higher pressure being the most likely explanation. Attempts at depositing chiral L.B. multilayers of ( + )-C,,H,,SO-p-tolyl were not successful because of crystallite formation on the quartz support. Multilayers of ( + )-S-octadecyl cysteine were deposited successfully, albeit with a monolayer of stearic acid interposed every seven monolayers of the chiral compound. No optical rotation was observed in the films.

show abstract

Section: Film Preparation and Characterisationmentioning

confidence: 99%

Chiral sulphur-containing molecules in Langmuir–Blodgett films

Georges¹,

Lewis²,

Llewellyn³

et al. 1988

J. Chem. Soc., Faraday Trans. 1

View full text Add to dashboard Cite

show abstract

Langmuir‐blodgett films of stilbazole complexes of iridium(I) and rhodium(I)

Richardson

Topaçlı

Majid

et al. 1994

Adv Material for Optics Elec

View full text Add to dashboard Cite

Complexes of 4-alkoxystilbazoles with iridium and rhodium form stable Langmuir layers at the air-water interface even when the alkoxy chain is relatively short (C5-cl2). The surface pressure-area isotherms indicate that condensed molecular monolayers are obtained. The area per molecule of each compound in its monolayer form is typically 0.60 nm2, which agrees well with the cross-sectional area of the [Ir(C0)2CIl or [Rh(C0)2CI] head group predicted using molecular models. This suggests that the molecules are oriented with the metal moiety close to the water surface and their alkoxystilbazole 'rod' protruding from the plane of the water surface. Such floating monolayers have been transferred on to solid substrates such as glass, aluminium (Al203/Al/glass) and silicon (Si02lSi) at relatively high speed (10 mm min -') to form Y-type LB assemblies. The UV-visible absorption properties of these materials in solution and LB film form have been studied. LB films of these complexes yield bathochromically shifted spectra relative to the LB film spectrum of the uncomplexed stilbazole. Additionally, these spectra are often broader and hypsochromically shifted relative to their corresponding solution spectra as a result of the close molecular packing within the LB film and the associated dipole-dipole interactions.The electrically polar nature of the molecules described in this paper suggest that they may be suitable candidates for new pyroelectric materials. Thus the pyroelectric coefficient (the rate of change of electric polarisation with respect to temperature) has been measured for a polar multilayer LB film containing an iridium complex. A pyroelectric coefficient of 3.5 pC m -2 K -(at 30 "C) has been measured, which is one of the highest reported values for an LB film. Additionally, a low dielectric loss of around 0.01 has been found over the frequency range 50Hz-1 kHz, indicating that such LB films may be useful materials for pyroelectric sensors.

show abstract

Pharmaceutical Sciences—1965

Dempski

Poll

1966

Journal of Pharmaceutical Sciences

View full text Add to dashboard Cite

Manipulation of insoluble films at an oil/water interface

Cited by 18 publications

References 11 publications

Chiral sulphur-containing molecules in Langmuir–Blodgett films

Chiral sulphur-containing molecules in Langmuir–Blodgett films

Langmuir‐blodgett films of stilbazole complexes of iridium(I) and rhodium(I)

Pharmaceutical Sciences—1965

Contact Info

Product

Resources

About