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The Latest at TRI

Innovative Method to Evaluate Hair Porosity by Investigating the Diffusion of Actives

Dr Larry Senak

Nearly 700 people have now registered for our fourth series of TRI Talks. Thanks so much for your support! In the last talk, taking place at 1:00 pm (ET), Wednesday 7th December, our Principle Scientist in Skin and Biosubstrates research, Dr Larry Senak, will tell us about a new method the team have been developing to measure active diffusion along the length of a hair fibre, and how this may be used to investigate hair porosity. The on-line seminars are free to join. Click here to register for the series of talks and to access playbacks Click here to log in to the TRI Talks Attendee hub website to watch live and replay

Since starting in April 2020, at the peak of the COVID-19 epidemic, the TRI Talks have regularly attracted hundreds of scientists from all around the world. To look at previous talks go to the TRI Library ( ). This year the TRI Talks will feature a series of four, free seminars focussed on the latest developments in hair science, presented by expert speakers from TRI Princeton, and will be available to watch live or on playback. For the first time the presentations will be streamed live from TRI's facilities in Princeton, giving you the chance to feel even closer to the speakers and the event. Questions will be taken from both on-line and live attendees. Also, for the first time, the talks will be captured on a dedicated event website, allowing you to easily replay any talks that you have missed. Ideal, for colleagues in different time zones! Talks will be held on the website for 2-3 months, after which they will be transferred, as usual, to the TRI Library.

The next talk, titled ‘Innovative method to evaluate hair porosity by investigating the diffusion of actives’, uses spectroscopy methods to look at the lateral diffusion of actives through the hair. As Larry describes:

Hair porosity is a key parameter to understand variations between human hair fibers related to age, ethnic group, hair treatment or diseases. In a hierarchical structure like in hair fiber, porosity may occur at any size level from nanoscale to macroscale. The porosity may also occur inside the three main structures, the medulla, the cortex and the cuticle. To evaluate and compare the hair porosity inside the cortex, at TRI, we have developed an innovative method based on the use of the FTIR imaging spectroscopy to investigate and visualize the active diffusion by capillary along single hair fiber. This method as well as the results will be presented and discussed during this TRI Talk.


All these TRI Talks are free to join and to access for playback, just register for the series at

Click here to log in to the TRI Talks Attendee hub website to watch live and replay

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