lucas film

In the present work, a chemical treatment with perfluorinated peroxides is proposed to obtain protective layers covalently linked to a diamond-like carbon (DLC) surface. The lubricant properties of perfluorinated compounds and the stability of the chemical modification of ...

The stress at which latex films crack during drying was investigated using beam bending. Two systems were investigated: (i) poly(methyl methacrylate/butyl acrylate) particles cast as thin films to examine the effect of film thickness on cracking film stress and (ii) polystyrene particles dried as drops to investigate the effect of particle size. Results indicated an inverse relationship between film thickness and film stress, whilst film stress was shown to be independent of the original particle size. These outcomes were in good agreement with Tirumkudulu and Russel's theoretical analysis [M.S. Tirumkudulu and W.B. Russel, Langmuir 21 (2005) 4938], albeit the measured stress values were almost twice the theoretical estimation.

Topology, as its name indicates, is a (mathematical) way of conceiving of TOPOS: the place, the space, all space, and everything included in it. Jean- Michel Kantor evokes a few examples of forms and spaces which should be stimulating for all those interested in the concept of space, architects in particular. In topology, we no longer distinguish between two figures, two spaces, if you can pass from one to the other by means of a continuous deformation–with neither leap nor cut. Knots are a simple way of escaping from the obtuseness of space. Modern techniques of visualization developed for the military or for the Hollywood studios of Lucas Films can integrate the deformations on computer screens: the continued deformations of surfaces are discretized, that is, they are replaced by approximations produced at fixed intervals, then filmed in video. The time of the virtual corresponds to the era of topology, and architects are finding inspiration there.

Description/Abstract Development of flexible thin film systems for biomedical, homeland security and environmental sensing applications has increased dramatically in recent years [1, 2, 3, 4]. These systems typically combine traditional semiconductor technology with new flexible substrates, allowing for both the high electron mobility of semiconductors and the flexibility of polymers. The devices have the ability to be easily integrated into components and show promise for advanced design concepts, ranging from innovative ...

A new sol–gel synthesis based on chloride compounds as precursors has been used to prepare bismuth titanate (BT) films. The films have been deposited by dip-coating and fired at different temperatures in air; they remain amorphous up to 500°C, and crystallize into the pyrochloric cubic phase Bi2Ti2O7 between 600° and 700°C while at higher temperatures of firing the stable Bi2Ti4O11 monoclinic phase is formed. The films have been characterized by X-ray diffraction analysis at gracing incidence, X-ray photoelectron spectroscopy, ellipsometric spectroscopy, UV–visible absorption, and atomic force microscopy. The photocatalytic properties of the films have been evaluated by exposing a methyl orange solution containing the BT films to UV light. The test has shown that the Bi2Ti2O7 films have a higher activity in comparison with reference anatase titania films.

Surfactants found in the atmosphere partition to the air-water interface of cloud droplets and aqueous aerosol forming an organic film 1,2. Using a Langmuir trough, aqueous phase hydroxyl radicals are generated by the photolysis of hydrogen peroxide in the subphase, and react with the organic film at the surface. The rate of film oxidation at the air-water interface has been monitored on a Langmuir trough fitted to a neutron reflectometer. The monolayer of deuterated stearic acid (C18D35O2H) serves as a proxy for the surfactant film at the air-droplet interface of a cloud droplet as the surfactant film undergoes kinetic decay in the troposphere. As the stearic acid is oxidised by hydroxyl radicals the surface pressure declines, as shown in figure 1, but the surface coverage suggests the formation of shorter tail length surfactant products. Under sustained exposure the products are oxidised and go into the bulk phase. A degredated chain mechanism is proposed to explain the decay of the film. The presence of an organic film at the cloud droplet-air interface is a factor in the potential of the cloud droplet to grow sufficiently to become a potential raindrop or to evaporate in the atmosphere3. The results suggest that oxidation from hydroxyl radical within a cloud droplet does not have an atmospherically significant affect on the lifetime of a film at the air-water interface of a cloud droplet as oxidation produces a product film. 1. Ellison B.G., Tuck A.F., and Vaida V. Atmospheric processing of organic aerosols. Journal of Geophysical Research, 1999, 104, D9, 11,633-11,641. 2. Donaldson D.J. and Vaida V. The Influence of Organic Films at the Air-Aqueous Boundary on Atmospheric Processes. Chemical Reviews, 2006, 106, 1445-1461. 3. Lohmann U. And Feichter J. Global indirect aerosol effects: a review. Atmospheric Chemistry and Physics , 2005, 5, 715-737. The surface coverage and surface pressure of a stearic acid monolayer over time on a subphase of 2.352 mol dm-3 H2O2 with photolysis at 17°C.