The mechanical and solvent transport properties of model whey protein hydrogels were characterized by mechanical indentation. Using cylindrical indenters with a large size range, 0.2–6 mm, it is confirmed that most of the force relaxation measured during indentation is poroelastic in nature, i.e. due to solvent transport. An additional, smaller, viscoelastic relaxation is observed with a relaxation time of ∼10 s. A new microindentation apparatus was built to test hydrogels using small indenters, resulting in constant solvent diffusivities and permeabilites with indenter sizes 0.2–1 mm, at roughly ∼4·10−10 m2/s and ∼5·10−18 m2 respectively, regardless of the swelling conditions considered. Relaxations, however, do not reach constant force values at very long times, increasing the uncertainty of the poroviscoelastic analysis. Despite this, the auxetic behaviour of whey protein hydrogels is highly likely, as inferred from consistent drained Poisson's ratios lower than 0.
Food Hydrocolloids – Elsevier
Published: Nov 1, 2017
It’s your single place to instantly
discover and read the research
that matters to you.
Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.
All for just $49/month
Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly
Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.
Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.
Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.
All the latest content is available, no embargo periods.
“Hi guys, I cannot tell you how much I love this resource. Incredible. I really believe you've hit the nail on the head with this site in regards to solving the research-purchase issue.”Daniel C.
“Whoa! It’s like Spotify but for academic articles.”@Phil_Robichaud
“I must say, @deepdyve is a fabulous solution to the independent researcher's problem of #access to #information.”@deepthiw
“My last article couldn't be possible without the platform @deepdyve that makes journal papers cheaper.”@JoseServera