The rheological behavior of pastes made with fly ash-slag blends in alkali silicate activating solutions is evaluated. link between the solution composition and fundamental alkali-activated are studied for different blends. transient response prior to initiation flow under an applied strain rate varies yield-type or Maxwell-flow behaviors depending on silica content solution. Adding dissolved a...

Natural mud sediments display complex rheological behaviour like thixotropy, viscoelasticity and yield stress. These characteristics can significantly vary over depth, from one layer to another, as each have a different density composition. Fast reliable measurements of stresses samples are important for maintenance operations in ports waterways. protocols, performed the laboratory, should give...

Thermoreversible biogels can serve as effective systems for delivery of drugs through nose with increased nasal residence time. The objective of this study was to use chitosan and glycerophosphate based thermoreversible systems for delivery of doxepin to brain through intranasal administration. Formulations were prepared by admixture of suitable dilutions of chitosan and glycerophosphate with o...

We present an experimental method allowing a direct measurement of the local rheological behavior of complex fluids. A magnetic probe is inserted into the bulk of the fluid and submitted to a controlled magnetic force or torque, which induces a mechanical perturbation of the fluid. The geometry of the perturbation can be varied using two kinds of probes: a magnetic bead submitted to a homogeneo...

Suspensions of clays in organic liquids change considerably in theological character from liquid to liquid or when additions of a second liquid are made; thus, for example when about 15 per cent. volume of ethyl alcohol was added to a dispersion of a sample of bentonite in water the specific viscosity and thixotropy (as measured 9 by rate of the sol-->gel transition) increased to a maximum in s...

Chemically stable ester derivatives of vitamins A, C and E have become a focus of interest for their role in the satisfactory results in skin aging treatments. Accordingly, the aim of this study was to evaluate the physical and chemical stability of a cosmetic formulation containing 1% retinyl palmitate, ascorbyl tetraisopalmitate and tocopheryl acetate, alone or in combination. In the studies ...

Cutaneous leishmaniasis (CL) is a resistant form of leishmaniasis that is caused by a parasite belonging to the genus Leishmania. FLU-loaded microemulsions (MEs) were developed by phase diagram for topical administration of fluconazole (FLU) as prominent alternative to combat CL. Three MEs called F1, F2, and F3 (F1-60% 50 M phosphate buffer at pH 7.4 (PB) as aqueous phase, 10% cholesterol (CHO)...

Carter, R M, 1975 A discussion and classlfmatlon of subaqueous mass-transport with particular application to gram-flow, slurry-flow, and fluxoturbldltes Earth-Sci Rev, 11 145--177 Sediments will remmn at rest on the sea-floor provided forces of shear resistance exceed the downslope shear stress imposed by gravity The shear resmtance of granular water-saturated sediments IS dmcussed within the c...

The availability of an active substance through the skin depends basically on two consecutive steps: the release of this substance from the vehicle and its subsequent permeation through the skin. Hence, studies on the specific properties of vehicles, such as their rheological behavior, are of great interest in the field of dermatological products. Recent studies have shown the influence of the ...

BACKGROUND Nitrofurantoin is a nitrofuran antibiotic that has been used for treatment of urinary tract against positive and negative bacteria. OBJECTIVES The aim of this study was to evaluate the effect of structural vehicles and flocculating agents on physical stability and rheological behavior of nitrofurantoin suspension. MATERIALS AND METHODS To formulate the suspensions, the effect of ...