The handleability and sensory perception of hand sanitisers by consumers affect the hygiene outcome. Spillage may result in under-dosing and poor sensory properties can lead to under-utilisation. We propose principles for designing the rheology of thickened alcohol-based hand rubs with acceptable handleability and hand feel, and evaluate a commercial hand gel and a variety of simplified microgel- or linear polymer-based formulations against these design criteria. Both the linear polymer and microgel additives can prevent run off and ensure handleability at low shear rates, with the microgels also conferring a finite yield stress. The polymer additives enable formulations with acceptable handleability without a yield stress, but can also result in 'sticky' formulations which may have a less optimal hand feel.
|Publication status||Accepted/In press - 22 Apr 2022|