Wetting problems

Slight film, translucent—moderate problem, mud needs wetting agent immediately. Very light film, highly translucent—slight wetting problem, mud needs some treatment. 

Data show a continuous decline of HETP with higher loads (see Fig. 8.16b). This implies maldistribution at low liquid rate (<2 gpm/fl2) also a possible wetting problem. The HETPs listed are within a turndown of 1.5 from the apparent loading point. 

A wide range of anionic and nonionic TRITON surfactants is available for use in the textile industry. They are useful in solving wetting problems, as dyeing assistants, as dye leveling agents, as softeners, as antistatic agents as well as emulsifiers and stabilizers. 

Flooding of oilfields is another example where interfacial reactions lead to changes of the Interfaclal tension. The issue is essentially a wetting problem the oil in the pores of the shales should be displaced by the fluid applied, which may be (caustic) water, a polymer solution, steam, or still something else, depending on the demands of the system, including the relative water- or oil-wettability of the rock. Under conditions where the interfacial tension is, or becomes, very low not only does the tension itself become relevant but cdso the bending moduli. 

The list is not complete, but indicates the versatility of wetting problems. Systematizing these is not always straightforward because they are interwoven. Nevertheless we shcdl try. 

The dissolution rates of solvates can vary considerably. Table 1.4 shows the range of intrinsic dissolution rates reported for solvates of oxyphenbutazone into a dissolution medium containing a surface active agent (to avoid wetting problems). The superior... 

Upflow reactors are sometimes used for small scale testing. The liquid phase is the continuous phase through which the gas bubbles rise and wetting problems are absent. Industrial reactors in which liquid and gas flow upward are rarely found, because it can be difficult to keep the catalyst bed immobile at large flow rates. 

Key features of the ED24574 system are its ability to run on commercial treater lines without cure speed problems, no foaming or wetting problems, and finally no insulation resistance problems after moisture conditioning. 

A 7-year-old boy has a significant bed-wetting problem. A long-acting indirect sympathomimetic agent sometimes used by the oral route for this and other indications is (A) Dobutamine... 

Viscous dissipation in the non-wetting phase (air in the classical forced wetting problem) is usually neglected, but has to be considered here, because of the significance of the liquid viscosity i/l with respect to i/ak- Indeed, both viscous forces in the wetting phase (air) comer Fair(u) = (3f i/air/i t - 0dl) and in the non-wetting one (liquid) Fl Cri v are of the same order (C 1 a numerical factor), because a = 3f l air/ L F... 

Underwater adhesives J M LANE Wetting problems pre-treatments durability... 

Tyre cord adhesion W J VAN OOIJ Adhesion to brass-coated steel Underwater adhesives J M LANE Wetting problems pre-tteatments durability... 

Secondly, the wetting problems of the dispersed fibrous LCP domains to the isotropic matrix phase are less sraious. Thirdly, in some cases LX3P imparts a nucleating effect to the crystallization of the matrix phase (6,7). Fourthly, the dimensional stability of the fabricated products may be greatly improved because of the low thermal expemsion coefficient of LCP. Finally, the products based on the insitu composite are reusable, which is helpful to solve the ecological and environmental problems. 

The recently introduced hydrophilic modified precoated plates have broadened the spectrum of selectivity available for TLC. These plates are referred to as HPTLC-NH2 precoated plates, in which > -aminopropyl groups are bonded to the surface of a silica-gel skeleton, and HPTLC-CN precoated plates. with cyanopropyl moieties as the functional groups. In terms of polarity the two hydrophilic modifications can be classified as follows Normal Si02 > NH2 > CN > RP. Since the surface NHv and CN groups are of medium polarity, no wetting problems are encountered with the corresponding plates even at the maximum level... 

---