what is the range of hlb value for w o type emulsion

(HLB) Type of emulsion produce depend on property of emulsifying agents HLB value Type of emulsion is a function of relative solubility of the surfactant Rule of Bancroft: The phase (oil/water) in which surfactant is relatively more soluble will become continuous phase High HLB Surfactant prefer formation o/w emulsion and vice versa For the mineral oil emulsion from tube 1 gives the greatest stability where the HLB value is 9 67 Generally for all type of oils used in this experiment emulsions from the tube 1 - 3 give the greatest stability Therefore the most ideal HLB value in this experiment is in the range of 9 67-11 34

Journal of Dispersion Science and Technology

HLB number i e the required HLB of an emulsifier for optimum emulsification and that the required HLB will differ depending on whetherwater or oil will be the continuous phase (Becher et al 1987) The best HLB number of an emulsifier for an emulsion is similar to the required HLB value of the oil (Marszal 1987) Braconi et al (1995) have

O/W W/O Oil-in-Water Water -in-Oil Types of Emulsions Most Common Emulsion Types 18 Oil-in-Water a mid-range HLB value of 7 00 as with TEA-Stearate emulsions With the advent of new molecules specialty chemicals polymers and silicone chemistry -the HLB system is becoming more and more difficult to work with and calculate Some ingredients have great difficulty being stabilized as they

The W/O type of emulsion is often encountered and here the internal water phase is most frequently the minor portion of the composition Considerably less common are emul- sions where the external water phase consists only of a small percentage of the total O/W emulsions with petroleum in-ternal phases in excess of 70% are relatively scarce Pick-ering (1)* early investigated compositions of

Chapter 6 emulsification and emulsification by surfactants 2006 4 19 1 Introduction 1 Emulsion immiscible liquid phase multiphase dispersion thermodynamics – A free PowerPoint PPT presentation (displayed as a Flash slide show) on PowerShow - id: 4e3605-YTA1M

1 EMULSION 2 PRESENTED BY: AREEBA SHAHID FARAH NAZ BUSHRA DAR MARINA MURAD JAWARIA NIAZ KHAN 3 DEFINITION: An emulsion is a thermodynamically unstable system consisting of at least two immiscible liquid phases one of which is dispersed as globules in the other liquid phase stabilized by a third substance called emulsifying agent

Emulsion Based Drilling Fluids: An Overview

soluble is the molecule (1) On the basis of emulsion theory the surfactants with a HLB value of 8-18 will stabilize an O/W emulsion and surfactants with HLB number around 4 will form W/O emulsion (20 21) For emulsion mud systems preferentially a water soluble surfactant will be

Experiment 1: HLB requirement: Abstract: Paraffin oil in water is emulsion can be done by using the most common emulsifying agent Sodium lauryl sulfate and Span 80 When StudentShare Our website is a unique platform where students can share their papers in a matter of giving an example of the work to be done If you find papers matching your topic you may use them only as an example of work

80 -tween 80 mixtures so as to have a HLB range varying from 6 4 to 13 8 Attempts were made to prepare both W/O and O/W emulsions by using oil: water fractions at 4:1 and 1:4 ratios respectively The emulsions which were stable for 24 h were further observed for 56 h to have an insight on the ir long -term sta bility The emulsions which showed signs of destabilization during the period of

determining the stability of emulsion (Griffin 1949 Griffin 1954) HLB can be calculated by following the equation below (Griffin 1954) (Eq 1 1): HLB = 20 * Mh / M (Eq 1 1) where Mh is the molecular mass of the hydrophilic portion of the molecule and M is the molecular mass of the whole molecule giving a result on a scale of 0 to 20 An HLB value of 0 corresponds to a completely lipophilic

an HLB value of A and the other surfactant has a value of B[15] Since the HLB system predicts TABLE 1: EMULSIONS COMPOSITIONS AND CONDUCTIVITY Experiment number A B Q of A Q of B Paraffin oil in gram Water for injection in gram HLB value Average of responses of conductivities at 25 Type of emulsion 1 0 1 0 9 0 5 4 5 30 0 65 0 5 370 Zero W/O

25 09 2012The HLB values of the dodecyl- tetradecyl- hexadecyl and octadecyl propylene glycol emulsifiers modified with SDS are characterized by hydrophobic properties and can be used as W/O emulsion stabilizers (Table 3) The compounds synthesized in the presence of PEGML demonstrate hydrophilic properties—their HLB values are within the range of 7–40 depending on the fatty acid

[Eccleston 1992 Eccleston 1997 Eccleston et al 2000] These have been shown in the studies carried out by Schwarz Weisspapir and Friedman which indicated that the efficacy of topically administrated diazepam in the form of emulsion cream depends greatly on the size of oil droplet and to a lesser extent on the type of oil used and formulation composition These also implied that

80 -tween 80 mixtures so as to have a HLB range varying from 6 4 to 13 8 Attempts were made to prepare both W/O and O/W emulsions by using oil: water fractions at 4:1 and 1:4 ratios respectively The emulsions which were stable for 24 h were further observed for 56 h to have an insight on the ir long -term sta bility The emulsions which showed signs of destabilization during the period of

Hlb

Emulsifying a w/o emulsion using surfactants which stabilise an oily disperse phase can produce w/o/w emulsions with an external aqueous phase and lower viscosity than the primary emulsion On injection into muscle for example the external aqueous phase dissipates rapidly leaving behind the w/o emulsion Nevertheless bio-pharmaceutical differences have been observed between w/o and

In formulating W/O emulsion low HLB value emulgent (surfactant) is required while for O/W emulsion high HLB value emulgent (surfactant) is required Emulgent should be less toxic and not irritant Most of the emulgent are non-ionic which are less irritant than anionic and cationic emulgent Ionic emulsifying agent will be rritant to gastrointestinal tract and have a laxative effect Thus

HLB values also affects the surfactant behaviour Low HLB surfactants favour the formation of w/o Microemulsion where as high HLB surfactants favour o/w Microemulsion formation Ionic surfactants such as SDS which have HLB value greater than 20 often require presence of co-surfactant to reduce their effective HLB to a value with in the range required for Microemulsion formation

Tween20 was opted for making oil-in-water emulsion because of its high HLB value of 16 7 which favors formation of oil-in-water type of emulsion Due to its high (HLB) value Tween20 molecules diffuse from the organic phase (oil and surfactant) to the aqueous phase and forms low droplet size emulsions Also being a small molecule surfactant Tween20 gets adsorbed onto the surface of emulsion

be the required HLB for the oil (to give that type of emulsion whether O/W W/O solubilisation etc ) This is expressed by the equation 3: HLB oil = (3) Where W A= the amount (weight) of the 1 st emulsifier (A) used W B= the amount (weight) of the 2 nd emulsifier (B) used at the optimum ratio giving the best emulsion HLB A HLB

Through experiments It is found that the emulsifier of O / W type (oil-in-water) emulsion often has an HLB value of 8 to 18 as the emulsifier of W / O type (water-in-oil) emulsion its HLB value is often at Between 3 and 6 When preparing an emulsion in addition to selecting the emulsifier according to the type of emulsion desired the different oil phase properties have different

The type of emulsion either o/w or w/o emulsion can be determined by the amount of each phase or the volume ratio If there is too much oily phase in an o/w emulsion the emulsion will become very unstable and phase inversion will occur where it is converted into w/o emulsion Hence suitable emulsifying agents with suitable HLB value should be selected in order to produce a stable emulsion

simple emulsion types are water-in-oil (W/O) and oil-in-water (O/ W) In terms of (technological) applications emulsions are vital in our daily life Food cosmetic pharmaceutical and oil indus-tries need to control emulsion properties such as emulsion type viability and stability to obtain the desired products 1–3 However an emulsion produced by simply mixing oil and water without

For the mineral oil emulsion from tube 1 gives the greatest stability where the HLB value is 9 67 Generally for all type of oils used in this experiment emulsions from the tube 1 - 3 give the greatest stability Therefore the most ideal HLB value in this experiment is in the range of 9 67-11 34

Tween20 was opted for making oil-in-water emulsion because of its high HLB value of 16 7 which favors formation of oil-in-water type of emulsion Due to its high (HLB) value Tween20 molecules diffuse from the organic phase (oil and surfactant) to the aqueous phase and forms low droplet size emulsions Also being a small molecule surfactant Tween20 gets adsorbed onto the surface of emulsion

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