The use of aqueous foams as a carrier fluid for pulp fibers instead of water has re-emerged in the paper and board industry in recent years. In foam forming, a surfactant is needed to reduce the surface tension of the carrier liquid and to create foam as a process fluid and flowing medium. This presents the following questions: (1) How do the water forming and foam forming processes differ? (2) How do the obtained wet/dry fibre sheets differ after forming and after wet pressing? (3) Which differences in the process behavior and sheet properties are due to the surfactant, and which are due to the presence of air bubbles in the flowing medium? The answers to these questions were sought by using an experimental academic approach and by applying a special dynamic
A wood
based yarn platform for capturing pharmaceutical molecules
from water was developed. Cellulose fiber yarns were modified with
cyclodextrins, and the capture of 17α-ethinyl estradiol (EE2),
a synthetic estrogen hormone used as contraceptive, from water was
tested. The yarns were prepared by spinning a deep eutectic solution
(DES) of cellulose in choline chloride-urea. Despite their high porosity
and water sorption capacity (5 g/g), the spun fiber yarns displayed
high wet strength, up to 60% of that recorded in dry condition (128
MPa with 17% strain at break). Cyclodextrin irreversible attachment
on the yarns was achieved with adsorbed chitosan and the conjugation
reactions and capture of EE2 by the cyclodextrin-modified cellulose
were confirmed via online detection with Surface Plasmon Resonance
(SPR). The facile synthesis of the bioactive yarns and EE2 binding
capacity from aqueous matrices (as high as 2.5 mg/g) indicate excellent
prospects for inexpensive platforms in disposable affinity filtration.
The study presents a strategy to produce a wood fiber based yarn to
be used as a platform for human and veterinary pharmaceutical hormone
capture.
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