What might happen to your system if there are changes to any of the parameters?.At a given O:W ratio, how close are you to the "tipping point" at the tail crossing?.At a given O:W ratio, given your current T, EACN, Cc and S, are you in the right zone of Type I (if you want o/w) or Type II (if you want w/o)?.Could you get a better result with a different surfactant in terms of MWt, ξ, A?.What is the best surfactant concentration for your application?.You can choose to answer the questions using the whole fishtail plot or homing in on a specific O:W ratio. The point of the fishtail plot is that it instantly tells you many things you should know about your emulsion system and which most of us don't know.
By moving the mouse over the point, the O:W ratio is shown.īelow we'll discuss why this is so useful Fish Tail Fern Scientific Name: Cyrtomium falcatum Family: Polypodaceae Toxicity: Non-Toxic to Dogs, Non-Toxic to Cats Toxic Principles: Non-toxic. By deselecting the O:W option and returning to the default 50:50 fish plot, the red line with the individual data points shows the tail positions for different O:W ratios. The positions of the fishtail points at different O:W ratios can be plotted. The fish plot loses its general symmetry and the tail crossing moves to lower % surfactant, showing the obvious fact that you need less surfactant to get an homogeneous solution if you have less oil (for o/w) or less water for (w/o). To try this out, select the O:W option and slide the %Oil slider. What you have below is essentially the same as the previous fish diagram but with the option of setting an O:W ratio. I term the plot (shown in red) the Fishtail diagram showing you at a glance where the fish's tail will be at other O:W ratios. Happily, HLD-NAC makes it easy to calculate the fish diagram at other O:W ratios. Ξ Å As discussed in the previous section, the problem with the fish diagram is that it defaults to the generally useless 50:50 O:W system. HLD - Hydrophilic Lipophilic Difference.
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