Foam forming

The foam forming iagredients are carefully metered to obtain the proper ratio of reactants, thoroughly mixed by either mechanical or impingement means, then appHed as a Hquid, a spray, or a froth with subsequent expansion and cuiing. 

Soil conditioners are materials that measurably improve the physical characteristics of the soil as a plant growth medium. Typical uses include erosion control, prevention of surface sealing, and improvement of water infiltration and drainage. Many natural materials such as peat and gypsum are used alone or in combination with synthetics for soil conditioning. This article is concerned with synthetic soil conditioners, many of which are introduced as polymeric systems similar to the gels and foams formed in situ by chemical grouts. 

Droplets from the jet caused by liquid rushing to fill the cavity left by the bubble (see Fig. 14-89). These droplets range up to 1000 Im, their size depending on bubble size. This is important only at modest loadings. Once foam forms over the surface, drop ejection by this mode decreases sharply. 

We achieved, that by contact of polyurethane foam with water solution of molybdophosphate, contain by pH 1-2,5 mixture of saturated (5 NMR P=-3.20 p.p.m. apply to 85 % H PO ) and unsaturated monovacant (x=0-t-4) (5 NMR P = -0,96 p.p.m.) heteropolycomplexes Keggin staicture, equilibrium discharge in the direction produced of saturated heteropolycomplex of Dowson stmcture and on the surface of polyurethan foam formed 18-molybdo-2-phosphate acid ( P = -2,40 p.p.m. in ether extract). The formed surfaces heteropolycomplex is stable for action 1 M solution of strong acids and basics and have ion exchanged properties in static and dynamic conditions to relation to macro and micro amount of M(I) ... 

A cellular or porous structure of foam plastics is produced with gas- or foam-forming agents. The quality of the resulting material depends on choosing the right agent,... 

Phenylene oxide Based (PPO) plastic that is a choice for electrical applications, housings for computers and appliances, both neat and in structural foam form. It has superior dimensional stability, moisture resistance due to styrene components, which, however, cause some sacrifice of weather and chemical resistance. Use includes automobile wheel covers, pool plumbing, consumer electronic external and internal components. 

One component formulation consists of prepolymers that are intermediate between monomers and the final polymer product. When released from a pressurized container the foaming gas expands and the prepolymer (containing unreacted cyanate groups) reacts with the moisture (water) in air to complete the polymerization reaction and cure. Because curing depends on the presence of moisture, when foam forming reactants are applied to occluded areas, such as cavities,... 

Marquis [86] described a method of enhancing the permeability profile of an oil-bearing formation during the injection of a foam-forming composition or a... 

B. I. Tulbovich, L. V. Kazakova, and V. I. Kozhevskikh. Foam-forming composition—contains surfactant, in form of alkali effluent from... 

The interfacial tension results reported in this paper are part of a study to examine the benefits of using commercial foam-forming surfactants with steam-based processes for obtaining additional oil recovery. Low interfacial tension at elevated temperatures is needed to reduce residual oil saturation and to allow foams to form, or enhance their performance. 

Cobalt-on-alumina catalysts with increased dispersion and catalytic activity are prepared by addition of mannitol to the cobalt nitrate solution prior to impregnation. Thermogravimetric analysis (TGA) and in situ visible microscopy of the impregnation solution show that the organic compound reacts with cobalt nitrate, forming a foam. The foam forms because significant amounts of gas are released through a viscous liquid. The structure of the foam is retained in the final calcined product. It is this effect that is responsible for the increased dispersion. 

Foamed boards, 23 403—404 Foamed polystyrene, 23 403 Foamed sheet polystyrene, 23 408 Foamex, commercial defoamer, 3 24 It Foam extrusion, 19 549 Foam-forming materials, injection of, 12 22-23... 

As is known, if one blows air bubbles in pure water, no foam is formed. On the other hand, if a detergent or protein (amphiphile) is present in the system, adsorbed surfactant molecules at the interface produce foam or soap bubble. Foam can be characterized as a coarse dispersion of a gas in a liquid, where the gas is the major phase volume. The foam, or the lamina of liquid, will tend to contract due to its surface tension, and a low surface tension would thus be expected to be a necessary requirement for good foam-forming property. Furthermore, in order to be able to stabilize the lamina, it should be able to maintain slight differences of tension in its different regions. Therefore, it is also clear that a pure liquid, which has constant surface tension, cannot meet this requirement. The stability of such foams or bubbles has been related to monomolecular film structures and stability. For instance, foam stability has been shown to be related to surface elasticity or surface viscosity, qs, besides other interfacial forces. 

Some white foam forms as the diethyl phosphonate is added. Because water in the ammonia consumes some of the sodium, not quite all the diethyl phosphonate is required to reach the endpoint. Excess diethyl phosphonate is deleterious. 

Coke, M., Wilde, P.J., Russell, E.J., Clark, D.C. (1990). The influence of surface composition and molecular diffusion on the stability of foams formed from protein detergent mixtures. Journal of Colloid and Interface Science, 138, 489-504. 

Hydrogen peroxide decomposes in the presence of potassium iodide to yield oxygen and steam. If we add some detergent to the mix, a foam forms as the oxygen and steam emerge from the flask. It s neat. 

Amount of foam formed depends on pressure drop to which inlet liquid is subjected, as well as characteristics of the liquid at separator conditions. Because foam comparators operate at atmospheric pressure, they cannot lake this into account. 

The foam drainage profiles for untreated stabilized and pipeline Nmian crude oils showed that there was a marked difference in stability between the two samples. Furthermore, conventional silicone oils (e.g., 60.000-cSt (60 000 mm /s) oil) did nut cause any significant collapse of the foam formed by depressurizing pipeline oil. Closer examination of the foam formed by the pipeline crude... 

Fig. 3.42 Region of two-dimensional foam formed by a PSi35-PNaA26 Langmuir-Blodgett film within the confines of a planar surface micelle domain (Meszaros et al 1994). 

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