An efficient nanoprecipitation technique using good cellulose acetate (CA) solvents as modifier for the dispersive media (nonsolvent) was developed for the generation of CA nanoparticles. Addition of tetrahydrofuran (THF) to the nonsolvent leads to smaller particles than obtained with pure water or standard stabilizing agents like surfactants and block copolymers. Sonication, efficient agitation, and optimization of process parameters like temperature, THF content, pH value and stirrer velocity reduces nanoparticle sizes and improves substrate recoveries. With the optimized process, spherical nanoparticles of 60 nm with 87% yield can be generated reproducibly. Possible applications are seen in surface science (e.g. surface modifications and surface functionalization of CA foils and membranes).
COBISS.SI-ID: 14756886
The supramolecular structure of environmentally friendly produced lyocell fibres is different from the classical man ]made cellulosic fibres, which clarifies their different dyeing properties. The purpose of research was to study the differences in the dyeability of viscose, modal and lyocell fibres and define the correlation between fine structure of cellulose fibres and their adsorption ability. Lyocell fibres are very similar to viscose fibres regarding the structure of the voids; however, they have significantly higher crystallinity index in comparison to viscose fibres. Lyocell and viscose fibres with the highest void volume have large inner surface; hence the dye adsorption ability is the greatest. Modal fibres showed the lowest dye concentration on the fibre because of their essentially smaller void volume despite of greater portion of amorphous regions when compared with lyocell fibres.
COBISS.SI-ID: 15285526
Nanometer-sized zinc-phosphate nanoparticles that would be capable of binding histidine-rich TNF-a analogs onto their surface via a coordinative bond were prepared . Zinc-phosphate nanoparticles with a size of around 60 nm were prepared by a wet precipitation method and characterized using SEM, EDX, XRD, and DLS. First, a testing protein was bound, afterward two TNF-a analogs with decreased activity were bound to the described nanoparticles. The efficiency of binding and the existence of coordinative bond were confirmed with SDS-PAGE analysis.
COBISS.SI-ID: 4607770