Interfacial measurement on skin and hair
Skin and hair-care products place particularly high demands on the chemical properties of the interface. Surfactants for cleaning or as emulsifiers are the main active ingredients of care products. Their choice and dosage is the key to a successful product. Our measuring instruments for investigating the surfactant effect will help you with the accurate determination and dosage of the ingredients.
Surfactants in soaps, washing lotions and shower gels are intended to effectively clean and at the same time protect the skin. This requires efficient surfactants which, even in small doses, improve the wetting and form the micelles necessary for carrying away the dirt. Our tensiometers measure the exact effect of the surfactants. In addition, the wetting can be measured directly on the skin using our mobile contact angle measuring instrument MobileDrop.
Care products for re-greasing the skin are usually emulsions of oil or grease and water. Natural and synthetic surfactants enable stable mixtures to be produced. Interfacial tension measurements help with the specific use of surfactants and, describe the mixing capability during production as well as the long-term stability of the finished product.
Shampoos, rinses and conditioners encounter certain wetting properties of the hair and change these when applied. The contact angle and its change due to the effect of the care product can be measured on individual hairs with our high-resolution single-fibre Force Tensiometer – K100SF. This gives an indication of the required care effect and also of unwanted damage to natural protective coatings.
Foam is almost always produced when using skin-care products, whether deliberately in the case of washing and care products or as a by-product. As every care product has its own requirements for foamability, foam stability, moisture content and homogeneity, a comprehensive characterisation of the foam using our Dynamic Foam Analyzer – DFA100 is helpful when developing the product.
AR279: Foam behavior of toothpaste
Analyses of the foam height and structure of three different types of toothpaste clearly indicate significant differences between the samples with respect to foamability and bubble size. Thus, the report shows how this method can be used for recipe optimization of toothpaste and for quality control during its production.
AR249: Characterization of liquid foams by the determination of surface rheological properties of surfactant solutions
Foam height measurements and measurements of the modulus of elasticity and modulus of viscosity are carried out on two body-care products. A relationship can be shown between higher surface elasticity and higher foam stability.
AR206: Contact angle determination by the "straw" method and packed cell method
An alternative to single fiber contact angle measurement on hair is the measurement of fiber bundles. Possible measurement errors due to very low wetting forces, irregular fiber diameters or curling at the surface are minimized here.
AR101: Evaluating Silicone Hair Treatment
Single fiber contact angle measurements are carried out with different silicones on dry, bleached hair. A comparison of several immersion cycles shows the different adsorption of the silicones onto the hair.
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- DFA100| foam analysis
- K100| premium tensiometer
- K11| stand-alone tensiometer
- K20| solid QC tensiometer
- BP100| dynamic surface tension (Lab)
- BP50| dynamic surface tension (QC)
- DVT50| drop volume tensiometer
- DSA100| high end drop shape analysis
- DSA30| all-round drop shape analysis
- DSA25| entry drop shape analysis
- MSA| mobile surface free energy