hlb scale slideshare

scale pr oduction, the material in the container is agitated . 863 Comments. Emulsifying agent works by following w ay: 1) Formation of a protective barrier. Propeller mixers . If the HLB of an emulsifier system is between 3-6, it has an oil affinity and such an emulsifier will optimally stabilize a water in oil emulsion. This number can be then used when selecting surfactant for the formulation of o/w or w/o emulsions. Nanotechnology incorporation in cosmetic formulation is considered as the hottest and emerging technology available. 0 From Embeds. However, since HLB is … On the other hand a emulsifier with a HLB value of 9-18 has a preference for water and therefore will optimally stabilize a oil in water emulsion. Values of 7– 9 indicate good wetting agents. Chemical types Nonionic HLB 12–16 Nonionic HLB . some commonly used … 10 Likes. These agents have both a hydrophilic and a lipophilic part in their chemical structure.HLB scale is used to decide the which emulsifying agents shall be used . HLB value is increased with increased hydrophilic nature, and decreased hydrophobic nature of surfactant. Presently, no chemical treatment or resistant plant is available that will control the disease. Causes of instability of emulsion. Alkylbenzene sulfonates are a class of anionic surfactants, consisting of a hydrophilic sulfonate head-group and a hydrophobic alkylbenzene tail-group. Surfactants is a molecule or ion that are adsorb to the surface to increase the surface tension. Figure 6.6: HLB scale HLB value of 1 indicates- surfactants is soluble in oil HLB value of 20 indicates- surfactants is soluble in water HLB value (1.8 to 8.6) indicates- … In the narrower sense (and in this glossary) the term relates to the liquid/liquid and liquid/solid phase boundaries, while for the liquid/gaseous interface we refer to surface tensio * Methods of compounding … Paul Nowak teaches speed-reading and memory improvement at organizations such as NASA and Google. 0 Number of Embeds. HLB is the ratio of oil soluble and water-soluble portions of a molecule. HLB: a ratio scale that assigns a number to a surfactant, based on the contribution of the individual groups of the surfactant molecule. Explain various identification tests for types of emulsion. 8 Test tubes. Generally, a combination of 2 emulsifying agent is … HLB scale. M-Pharmacy First Sem Question paper questions. Commercial Name Chemical Name HLB Value; Glyceryl monostearate: Glyceryl monostearate: 3.8: PEG 400 Monoleate: Polyoxyethylene monooleate : 11.4: PEG 400 … The … The ratio of solubility of compounds in the oil and aqueous phase is denoted by partition coefficient. The contribution of these groups to the overall solubility is commonly referred to as the HLB. Table 2 indicates the saponificatio value in NaOH scale Table 2: Representation of Saponification Value in KOH Scale and NaOH Scale Oils Saponification Values KOH scale NaOH(lye) mmols 1 gram mg Scale mg Coconut oil 252.0 353.55 8.8 Sunflower oil 193.2 271.06 6.7 Olive oil 194.6 273.02 6.8 Mustard oil 166.6 233.73 5.8 Gingelly 190.4 267.13 6.6 (Sesame) oil 9 From Table 2, … Commonly Used Emulsifiers And Their HLB Values . HLB numbers ar e experiment ally determined for the diff erent emulsifiers. Delivery of drugs to the skin is an effective and targeted therapy for local dermatological disorders. 0. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. An HLB less than 6 favors water in oil emulsions; a value greater than 8 favors oil in water emulsions. Downloads. Soft Matter This journal is ' The Royal Society of Chemistry 2016 pressure pump pushes the macroemulsion through a narrow gap (gap height is on the order of a few microns88) where the large droplets break into smaller droplets as they are subjected A 50ml measuring cylinder Cosmetic … it includes how a surfactant molecule being distributed at a liquid surface/interface also explains the structure of a surfactant molecule and how it will b or… HLB was first proposed by Griffin 1 and currently several formulas to calculate HLB have been reported. 2,3 Since HLB indicates the characteristics of nonionic surfactants, it is commonly used as an indicator for choosing a surfactant for specific applications, such as emulsifiers or cleansers, which are both mentioned later in this chapter (Fig. 2)Reduction of interfacial tension. Anionic surfactants represent, by volume, the most important group of surfactants used in cleaning products. Usually a combination of two emulsifying agent is used to form a more stable emulsion. If an emulsifier has a low HLB number, there are a low number of hydrophilic groups on the molecule and it will have more of a lipophilic character. Topical gel formulations provide a suitable delivery system for drugs because they are less greasy and can be easily removed … A gel is a solid or semisolid system of at least two constituents, consisting of a condensed mass enclosing and interpenetrated by a liquid. 15.2). Relation between HLB and surfactant applications HLB < 8 HLB > 10 • Mixing unlike oils together – surfactants with HLB’s of 1 to 3 • Preparing water-in-oil emulsions … HLB values, and are used as emulsifying agents for oil-in-water emulsions. 7–10. Objectives Introduction Emulsifying Agents Synthetic Natural Finely Divided Auxiliary HLB Systems Methods of Emulsion Preparation Resources. HLB is a ratio scale that assigns a number to a surfactant based on the contribution of the individual groups of the surfactant molecule.

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