cellulose nanofibers (cnf) which isolated from wood and non woody plants have attractive advantages comparing with the synthetic fibers, some of the most relevant being the following: low density, renewable sources, biodegradability, availability, and high specific mechanical properties. recently, the use of cnf in green materials, especially as reinforcement in different polymers has been incr...

The surface charge properties of two SiO2 and three Al2O3 mineral adsorbents with varying degrees of framework porosity were investigated using discontinuous titration and ion adsorption methodologies. Points of zero net charge (p.z.n.c) for porous and non-porous SiO2 were <2.82 and for Al2O3 minerals ranged from 6.47–6.87. Silica surfaces possessed very slight negative charge in the acid pH ra...

I HE MICIIODETERMIXATION of fiee fatt acids (FFA) in plasma has received colisiderable attelition in recent years (1-8). Although a riumher of different procedures Ilave beemi reported, most of them consist of 2 essential steps: tire extraction of tire FFA from plasnla with orgamlic solvents, an(1 the titration of the extracted FFA in a 2-phase system with a standard aqueous base. Various extra...

The main objective of this study was to develop an effective potentiometric saturation titration protocol for determining the aqueous intrinsic solubility and the solubility-pH profile of ionizable molecules, with the specific aim of overcoming incomplete dissolution conditions, while attempting to shorten the data collection time. A modern theory of dissolution kinetics (an extension of the No...

Cobalt has great biological effects on human beings and also other living organisms, hence its determination is very important. In this regard, a novel coated graphite electrode was designed for determination of Co2+ ions by exploiting 6-chloro-11- azabenzo[a]phenothiazin-5-one as a neutral ion carrier, for the first time. The foremost function was witnessed from the membrane composition of PVC...

From the analysis of the potentiometric titration data of polyelectrolytes, we can obtain the electrostatic free energy of the macromolecules. Therefore, potentiometric titration is a useful experimental procedure to study the conformation and conformational change of macromolecules. A few examples of the application of potentiometric titration to the studies on polypeptides, protein and DNA ar...

Quantitative determination of Brønsted acid sites in acidic mordenite samples with varying proton concentrations has been studied using aqueous conductometric titration method. Conductometric titration of the ammonium form of mordenite with sodium hydroxide is feasible and the results indicate potential number of Brønsted acid sites. However, Brønsted acid sites concentration in acidic mordenit...

The environmentally important and toxic arsenate anion (HAsO4(2-)) is trapped in the cavity of a dimeric capsular assembly formed by a tripodal urea receptor. The selective binding of HAsO4(2-) over other anions is observed in a semi-aqueous solvent using a (1)H NMR titration study.