The test is performed in closed vials at 100 oC for 5 days with the tested material and a reference paper in the vial. Volatiles off-gassed from the tested material may cause degradation of the reference paper and lead to a decrease in its degree of polymerization. This is determined using viscometry. The optimal vial type is proposed, leading to reproducible results with a standard deviation f...

Kinetics of chitosan fragmentation by ultrafast laser pulses, and the effects of reactor shape, saturation of solution with oxygen and chitosan molecular weight on fragmentation were investigated. The degree of fragmentation and molecular weight distribution of the fragments were followed by viscometry and size exclusion chromatography. Chain scission increased with light pulse energy, irradiat...

A sample of high-molar mass hyaluronan was oxidized by seven oxidative systems involving hydrogen peroxide, cupric chloride, ascorbic acid, and sodium hypochlorite in different concentrations and combinations. The process of the oxidative degradation of hyaluronan was monitored by rotational viscometry, while the fragments produced were investigated by size-exclusion chromatography, matrix-assi...

We show that a perylene bisimide (PBI)-based gelator forms self-sorted mixtures with a stilbene-based gelator. To form the self-sorted gels, we use a slow pH change induced by the hydrolysis of glucono-d-lactone (GdL) to gluconic acid. We prove that self-sorting occurs using NMR spectroscopy, UV-Vis spectroscopy, rheology, and viscometry. The corresponding xerogels are photoconductive. Importan...

The ‘‘wet gel’’ model used earlier to describe the results of dynamic light scattering studies of neat poly~ethylene oxide! ~PEO! melts has now been successfully applied to PEO-melt/LiClO4 solutions. The results of static light scattering and viscometry measurements along with measurements from dynamic light scattering revealed that with or without salt, the melt/gel was an overdamped system wh...

With rheology progress was made in understanding of structure of gels and colloidal suspensions, particularly with regard to polysaccharides and large glyconjugates. Whereas the rheology of concentrated dispersions is the considerable interest to the colloidal scientist, pharmacist or food technologist [1], of more interest to molecular biophysicist is dilute solution viscometry and the structu...

The quality of tomato (Solanum lycopersicum) was investigated at green (GR), yellowish–orange (YOR) and red ripening (RR) stages using viscometry, to identify the best stage maximally derive its nutritional values. Selected tomatoes were obtained from a local market in Osogbo, Nigeria three They cleaned, grated, extracted with muslin cloth centrifuged. viscosity supernatant - fresh juices (FTJ)...

The performance of cold bitumen emulsion (CBE) mixtures is strongly linked to an optimised design the binder blends and mastics. Types dosages bitumen, mineral additions workability must be characterised optimised. This study aims at providing approach for fundamental characterisation CBE materials using rotational viscometry. Firstly, a procedure measuring viscosity slurries Brookfield viscome...

The melt viscosity (η) of anhydrous and hydrous peridotite was investigated using a multipronged approach combining micropenetration viscometry, conventional DSC, flash DSC Brillouin spectroscopy. Raman spectroscopy measurements were used to verify the absence crystallization and/or degassing during high-temperature these extremely reactive glasses melts, ensuring that data corresponded crystal...