نتایج جستجو برای: thixotropic behavior

تعداد نتایج: 619432  

1999
T. AUBRY M. MOAN

Nearly all muds, in drilling applications, contain smectite clay minerals, such as montmorillonite or hectorite, which have the remarkable property of swelling in the presence of water. Such systems are known to exhibit long-term gelation and thixotropic behavior, of great importance in applications, depending on clay volume fraction, particle properties (origin of the clay, surface charge, etc...

2014
Gisela Bevilacqua Rolfsen Ferreira da Silva Maria Virginia Scarpa Gustavo Rossanezi Eryvaldo Socrates Tabosa do Egito Anselmo Gomes de Oliveira

Microemulsions (MEs) are colloidal systems that can be used for drug-delivery and drug-targeting purposes. These systems are able to incorporate drugs modifying bioavailability and stability and reducing toxic effects. The jasmonate compounds belong to a group of plant stress hormones, and the jasmonic acid and its methyl ester derivative have been described as having anticancer activity. Howev...

Journal: :Colloids and surfaces. B, Biointerfaces 2008
Vuk Uskoković

Whereby cholesterol presents one of the major fatty substances in human body, carboxymethyl cellulose is a water-soluble derivative of cellulose, the most abundant dietary fiber. Whereas on one hand in vivo precipitation of cholesterol is the major cause of atherosclerosis, dietary fibers are on the other hand known for their ability to clean the fatty plaque deposited on intestinal pathways, a...

2017
Guillaume Ovarlez Laurent Tocquer François Bertrand Philippe Coussot

We show that besides simple or thixotropic yield stress fluids there exists a third class of yield stress fluids. This is illustrated through the rheological behavior of a carbon black suspension, which is shown to exhibit a viscosity bifurcation effect around a critical stress along with rheopectic trends, i.e., after a preshear at a given stress the fluid tends to accelerate when it is submit...

Journal: :Molecular pharmaceutics 2015
Howida K Ibrahim Nevine S Abdel Malak Sally A Abdel Halim

Deacetylated gellan gum and two sodium alginate polymer types were used each at three concentrations in the suitable range for their sol-gel transition. The prepared nine droppable gels were evaluated in vitro, ex vivo through sheep nasal mucosa, as well as in vivo in comparison to drug solution given intravenously and orally at the same dose. The prepared formulas gelled instantaneously in sim...

2017
Gerwin Louis Tapan Dela Torre Kerstin Mariae Gonzales Ponsaran Angelica Louise Dela Peña de Guzman Richelle Ann Mallapre Manalo Erna Custodio Arollado

The high prevalence of pediculosis capitis, commonly known as head lice (Pediculus humanus capitis) infestation, has led to the preparation of a community-based pediculicidal ointment, which is made of common household items and the extract of Tinospora crispa stem. The present study aimed to evaluate the safety, efficacy, and physicochemical characteristics of the T. crispa pediculicidal ointm...

2016
Juarana Dal Mas Tailyn Zermiani Liliani C Thiesen Joana LM Silveira Kathryn ABS da Silva Márcia M de Souza Angela Malheiros Tania MB Bresolin Ruth M Lucinda-Silva

The aim of this study was to develop nanoemulsion containing soft extract of stem bark of Rapanea ferruginea to improve the topical delivery and anti-inflammatory activity. The extract of R. ferruginea stem bark was incorporated into the oily phase of the nanoemulsion by the method of phase inversion at low energy. The developed nanoemulsion had an average droplet size of 47.88±8.20 nm and a po...

Journal: :Puerto Rico health sciences journal 2008
Danester Quiñones Evone S Ghaly

The main objective of this research is to develop and characterize a series of carbopol 934 (CP) hydroxypropyl methylcellulose (HPMC) and a combination of carbopol-HPMC as a gel base for topical delivery of nystatin. The drug level was held constant at 1.72% w/w and the level of propylene glycol which is used as a co-solvent and penetration enhancer was also kept constant at 2% w/w. The total l...

Journal: :Soft matter 2015
F Martoïa C Perge P J J Dumont L Orgéas M A Fardin S Manneville M N Belgacem

The rheology of NFC suspensions that exhibited different microstructures and colloidal stability, namely TEMPO and enzymatic NFC suspensions, was investigated at the macro and mesoscales using a transparent Couette rheometer combined with optical observations and ultrasonic speckle velocimetry (USV). Both NFC suspensions showed a complex rheology, which was typical of yield stress, non-linear a...

Journal: :Applied Clay Science 2021

Thixotropy-governed temporal microfabric evolution, in a naturally occurring illitic marine clay and manufactured kaolinitic at their respective liquid limits, was probed quantitatively by both one-dimensional X-ray diffraction (1DXRD) 2DXRD via orientation index (OI) texture (TI) respectively. Results showed that the two fabric indexes, OI TI, continuously evolved nonmonotonically but consiste...

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