Manipulating the colloidal properties of (non-)sulfated cellulose nanocrystals via stepwise surface cyanoethylation/carboxylation

A Fenton-like System (Cu(II)/H2O2) for the Preparation of Cellulose Nanocrystals with a Slightly Modified Surface

“…The critical coagulation concentration (CCC) was determined by the coagulation rate. , Change in the optical density of sols with time in the first seconds was used to determine the coagulation rate . CNC sols with a KCl concentration of ≥0.05 M (Figure S5) undergo fast change in optical density (Δ A ) during the first seconds and then reach a plateau.…”

“…Thus, we can conclude that both the shape and crystal structure of CNC insignificantly affects their aggregative stability. In our latest article, this issue is disclosed in detail by the example of CNC with sulfated, carboxylated, and cyanoethylated surface …”

“…Colloidal Stability of CNC Sol. Colloidal stability was determined via previously reported methods 32,37 using change in absorbance at a wavelength of 560 nm over time depending on the electrolyte concentration and dependence of zeta potential and apparent size versus KCl concentration.…”

Environmentally friendly Au@CNC hybrid systems as prospective humidity sensors

“…Stable CNC hydrosols were isolated by centrifuging the homogeneous mixture at 4000 rpms for 30 min then subjecting it to 3 days of dispersion dialysis. 18 The CNCs were treated under hydrothermal conditions to determine optimal treatment conditions. Hydrothermal treatment entailed lling a PTFE autoclave to 80% of its total volume and heating in an oven for 12 hours.…”

Analyzing the surface of functional nanomaterials—how to quantify the total and derivatizable number of functional groups and ligands

“…Also, the use of other ion-selective electrodes is possible [74,75]. Potentiometric titrations have been used for characterizing the surface chemistry of different types of organic and inorganic NM with various FG, and have been applied to determine the number and nature of acidic sites (carboxy, lactone, phenol, and ester groups) on carbonbased materials like carbon dots (CD), nanocellulose/ nanobentonite composites, biochar particles, multi-walled carbon nanotubes, or cellulose nanocrystals [76][77][78][79][80], or to quantify hydroxy (silanol) and thiol groups on hybrid silica particles [81]. Potentiometric titrations have also been used to determine the total number of acidic sites on different catalyst materials like phosphotungstic acid-functionalized Sn-TiO 2 and organic-inorganic polyoxometalate NP, SrTiO 3 particles used to catalyze condensation, hydrogenation, and amination reactions, functionalized silica particles employed as catalysts for the esterification of linoleic acid, and photocatalytic TiO 2 / S-doped carbon hybrids [82][83][84][85][86].…”