Dissolution of cellulose having different viscosity-average molecular weight ( M η ) in 7wt%NaOH/12wt%urea aqueous solution at temperature from 60 to 12.6°C was investigated with optical microscope, viscosity measurements and wide X-ray diffraction (WXRD). The solubility (S a ) of cellulose...
The EEM fluorescence spectra of water samples (SE, MW > 10 kDa, and MW < 10 kDa solution) and detached foulants from RO membranes fouled by the three samples above were plotted. In Fig. 4a, c, a minor discrepancy was found between the EEM spectra of SE and MW < ...
What is the mass (weight) fraction of sodium hydroxide NaOH? What is the molar mass of KOH? What volume of a 5.5 M sodium hydroxide (NaOH) solution is needed to prepare 300 ml of 1.2 M NaOH solution? What is the molar mass of NaCl? How to prepare 15 w% NaOH? What is the pH ...
The carbohydrates were separated by running isocratic or gradient elutions on columns packed with amino-modified polystyrene divinylbenzene phases, using 0.1 N NaOH as eluent. The compounds were detected by a Pulsed Amperometric Detector, after post-column addition of 1 N NaOH solution. Twenty-two ...
Separation of lignin from cellulose in biomass can be performed in various ways, each of which affects the structure of the lignin produced. The most common separation method is the Kraft process in the pulp and paper industry, which uses caustic soda (NaOH) and sodium sulfide (Na2S) to ...
Calculate the mass of KHP which will result in an endpoint of 20.00mL when titrated against 0.097M NaOH. If 18.43mL of a 0.1274 M NaOH solution is needed to reach the first equivalence point in the titration of a 0.2700 g sample of amino acid, what is the molecular weight of the ac...
Pectin, a natural polysaccharide found in the cell wall of most higher plant such as citrus, has drawn much attention due to its potential beneficial role in facilitating the treatment of many diseases like cancer, hyper cholesterol and diabetes. However, the broad application of pectin faces grea...
0.025 g), glutamic acid (0.8 mmol, 0.118 g), glutamine (0.6 mmol, 0.088 g), asparagine (0.6 mmol, 0.080 g), or phenylalanine (0.6 mmol, 0.099 g) was added, respectively, and the pH value of the solution was adjusted to 8-9 with NaOH solution. ...
2.1. Ultrasound-assisted deacetylation of beta-chitin To carry out a typical USAD reaction, beta-chitin particles (0.125 mm < d < 0.250 mm) were suspended in 40% (w/w) aqueous NaOH at a ratio beta-chitin/NaOH aqueous solution of 1/10 (g mL−1), the suspension was transferred to a...
In all of the systems, until the progress of the polymerization of NIPA initiated by PETCP was completed (i.e., at 5 h), the viscosity increased but the reaction mixture remained in solution state. However, in the system with a DMF composition of 25%, gelation occurred after 6 h ...