The chemorheology of poly (methacrylamide-co-acrylic acid) gel crosslinked by Chromium (III) (Cr ) III ions was investigated using stress-controlled viscometry techniques. This work showed that between various variables, such as polymer and crosslinker concentrations, salinity, pH and temperature, the later parameter had a significant effect on the idle time and processing time as two critical ...

Melamine formaldehyde (MF) resins have been synthesized at different reaction temperature and pH values. Different molar ratios of melamine and formaldehyde were used to synthesize the corresponding resins. The prepared resin samples were characterized by using molecular weight determination viscometry and thermogravimetric analysis (TGA). The maximum percentage of solid content (69.7%) was obt...

Stobadine·2HCl and its two hydrophilic derivatives SM1dM9dM10·2HCl and SME1i-ProC2·HCl were tested in the function of antioxidants on hyaluronan (HA) degradation induced by the Weissberger oxidative system [ascorbate plus Cu(II)]. As a primary method, rotational viscometry was applied, where the substance tested was added before or 1 h after the initiation of HA degradation. The most effective ...

The settling dynamics of falling spheres inside a Laponite suspension is studied. colloidal synthetic clay that shows physical aging in aqueous due to the spontaneous evolution inter-particle electrostatic interactions. In our experiments, millimeter-sized steel balls are dropped suspensions different ages (i.e., time elapsed since sample preparation). motion captured using high-speed camera an...

A new method for retrieving cloud optical depth from ground-based measurements of zenith radiance in the red (RED) and near-infrared (NIR) spectral regions is introduced. Because zenith radiance does not have a oneto-one relationship with optical depth, it is absolutely impossible to use a monochromatic retrieval. On the other side, algebraic combinations of spectral radiances, such as normaliz...