نتایج جستجو برای: viscoelastic surfactants

تعداد نتایج: 22594  

Journal: :The American journal of physiology 1964
G D WEBB

WEBB, GEORGE Il. Efects of surfactants on the twitch tension uf frog sartorius muscle. Am. J. Physiol. 207(2) : 397-401. 196+--Many types of cells show permeability increases to ions and to various uncharged molecules when exposed to surface-active agents (surfactants) . Nonionic surfactants are less effective than ionic surf’actants in increasing permeability and in depolarizing nerve and musc...

K Kaur R Kakar,

This study is concerned to check the validity and applicability of a five parameter viscoelastic model for harmonic wave propagating in the non-homogeneous viscoelastic rods of varying density. The constitutive relation for five parameter model is first developed and validity of these relations is checked. The non-homogeneous viscoelastic rods are assumed to be initially unstressed and at rest....

K Kaur K.C Gupta R Kakar,

The purpose of this paper is to analysis the viscoelastic models under dynamic loading. A five-parameter model is chosen for study exhibits elastic, viscous, and retarded elastic response to shearing stress. The viscoelastic specimen is chosen which closely approximates the actual behavior of a polymer. The module of elasticity and viscosity coefficients are assumed to be space dependent i.e. f...

Journal: :journal of dentistry, tehran university of medical sciences 0
jafarzadeh t erfan m watts dc

statement of problem: biomechanics of the human dentition is inherently complex. purpose: the aim of this study is to investigate, in vitro, the creep and the recovery of dentin under static uniaxial compressive stress conditions. materials and methods: specimens of cylindrical morphology were prepared from recently extracted non-carious lower molar teeth, such that the average tubule orientati...

2017
M H Mehrabi Meldi Suhatril Zainah Ibrahim S S Ghodsi Hamed Khatibi

Conventional seismic rehabilitation methods may not be suitable for some buildings owing to their high cost and time-consuming foundation work. In recent years, viscoelastic dampers (VEDs) have been widely used in many mid- and high-rise buildings. This study introduces a viscoelastic passive control system called rotary rubber braced damper (RRBD). The RRBD is an economical, lightweight, and e...

Journal: :journal of ultrafine grained and nanostructured materials 2014
soheila kharratian khameneh mahmoud heydarzadeh sohi abolghasem ataie

the influences of anionic sodium dodecylsulfate (sds) and cationic hexadecyltrimethylammonium bromide (htab) surfactants on the incorporation and distribution of barium hexaferrite nanoparticles in the electrodeposited cofe-bafe12o19 composite thin films were studied. sulphate bathes with natural ph containing 0 to 2 g/l surfactants were used for electroplating at room temperature. field emissi...

Journal: :journal of petroleum science and technology 0
bader h. albusairi kuwait university adam al-mulla kuwait university

the rheological properties of four different kuwaiti crude oils in the presence of polyacrylamide (paa) were investigated. paa was varied at three different concentrations of 25, 50, and 75 ppm to study the viscoelastic properties in the untreated samples. four different temperatures (25, 30, 35, and 40 °c) were used to evaluate different viscoelastic parameters of the treated and untreated kuw...

Journal: :journal of dentistry, tehran university of medical sciences 0
abbas monzavi associate professor, laser research center of dentistry, dentistry research institute, department of prosthodontics, tehran university of medical sciences, tehran, iran. hakimeh siadat associate professor, dental implant research center, dentistry research institute, department of prosthodontics, tehran university of medical sciences, tehran, iran. mohammad atai professor, iran polymer and petrochemical institute (ippi), tehran, iran. marzieh alikhasi associate professor, dental research center, dentistry research institute, department of prosthodontics, tehran university of medical sciences, tehran, iran. vahideh nazari resident of prosthodontics, tehran university of medical sciences, tehran, iran. sadigheh sheikhzadeh resident of orthodontics, tehran university of medical sciences, tehran, iran.

little is known about the interaction of tissue conditioners and modeling plastics. this study evaluates the influence of a variety of commercial tissue conditioners on alteration of viscoelastic properties of modeling plastics.in this in vitro study, the dynamic viscoelastic properties of four commercially available tissue conditioners (tc), visco-gel (vg), gc soft-liner (sl), fitt (ft), and c...

Journal: :Journal of Colloid and Interface Science 2021

In light of environmental concerns and changing consumer demands, efforts are increasing to replace frequently used animal-based emulsifiers. We demonstrate the interfacial network formation emulsifying potential Arthrospira platensis protein extracts hypothesize a mechanistic change upon progressing purification. A microalgae suspension A. powder in phosphate buffer solution (pH 7, 0.1 M) was ...

2015
Minji Lee Eun Sil Jin Sung Kwang Lee

CMC (critical micelle concentration) is lowest concentration when micelle was created in aqueous solution of surfactant. In this study, we collected CMC data to develop the QSPR model of gemini surfactants from literatures. Gemini surfactants are composed of two monomeric surfactant molecules linked by a spacer chain. Gemini surfactants can self-assemble at concentrations almost a hundred-fold ...

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