scholarly journals Size effects on rotational particle diffusion in complex fluids as probed by Magnetic Particle Nanorheology

2019 ◽  
Vol 21 (48) ◽  
pp. 26525-26539 ◽  
Author(s):  
Melissa Hess ◽  
Eric Roeben ◽  
Patricia Rochels ◽  
Markus Zylla ◽  
Samira Webers ◽  
...  
Keyword(s):  
Rheological Properties ◽  
Size Effects ◽  
Magnetic Particle ◽  
Complex Fluids ◽  
Particle Diffusion ◽  
Size Dependent ◽  
Tracer Particles ◽  
Versatile Tool ◽  
Magnetic Tracer

Magnetic Particle Nanorheology is a versatile tool to investigate the size-dependent rheological properties of complex fluids using magnetic tracer particles.

scholarly journals The Microcantilever: A Versatile Tool for Measuring the Rheological Properties of Complex Fluids

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
I. Dufour ◽  
A. Maali ◽  
Y. Amarouchene ◽  
C. Ayela ◽  
B. Caillard ◽  
...  
Keyword(s):  
Shear Stress ◽  
Rheological Properties ◽  
Hydrodynamic Force ◽  
Complex Fluids ◽  
Dynamic Spectrum ◽  
Complex Shear Modulus ◽  
Confined Fluid ◽  
Complex Shear ◽  
Versatile Tool ◽  
Surrounding Fluid

Silicon microcantilevers can be used to measure the rheological properties of complex fluids. In this paper, two different methods will be presented. In the first method, the microcantilever is used to measure the hydrodynamic force exerted by a confined fluid on a sphere that is attached to the microcantilever. In the second method, the measurement of the microcantilever's dynamic spectrum is used to extract the hydrodynamic force exerted by the surrounding fluid on the microcantilever. The originality of the proposed methods lies in the fact that not only may the viscosity of the fluid be measured, but also the fluid's viscoelasticity, that is, both viscous and elastic properties, which are key parameters in the case of complex fluids. In both methods, the use of analytical equations permits the fluid's complex shear modulus to be extracted and expressed as a function of shear stress and/or frequency.

Ligament size-dependent electrocatalytic activity of nanoporous Ag network for CO2 reduction

2018 ◽  
Vol 210 ◽  
pp. 289-299 ◽  
Author(s):  
Wanfeng Yang ◽  
Wensheng Ma ◽  
Zhonghua Zhang ◽  
Chuan Zhao
Keyword(s):  
Size Effects ◽  
Electrocatalytic Activity ◽  
Co2 Reduction ◽  
Size Dependent ◽  
Ligament Size

Nanoporous Ag (ligament size: 21 nm) exhibits superior CO selectivity and activity, confirming strong ligament size effects on CO2 reduction.

scholarly journals Analysis and Testing of Chain Characteristics and Rheological Properties for Magnetorheological Fluid

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Song Chen ◽  
Jin Huang ◽  
Hongyu Shu ◽  
Tiger Sun ◽  
Kailin Jian
Keyword(s):  
Magnetic Field ◽  
Rheological Properties ◽  
Magnetic Particle ◽  
Volume Fraction ◽  
Chain Structure ◽  
Field Size ◽  
Digital Holographic Microscopy ◽  
Mr Fluid ◽  
Shear Yield ◽  
Holographic Microscopy

Digital holographic microscopy is presented in this study, which can measure the magnetorheological (MR) fluid in different volume fractions of particles and different magnetic field strengths. Based on the chain structure of magnetic particle under applied magnetic field, the relationships between shear yield stress, magnetic field, size, and volume fraction of MR fluid in two parallel discs are established. In this experiment, we choose three MR fluid samples to check the rheological properties of MR fluid and to obtain the material parameters with the test equipment of MR fluid; the conclusion is effective.

A Dimensional Analysis Model for Geometric Size Effects of Single Crystals

2010 ◽  
Vol 97-101 ◽  
pp. 2184-2187
Author(s):  
Xiao Liang Chen ◽  
Shun Hong Lin ◽  
Zuan Tian
Keyword(s):  
Yield Strength ◽  
Single Crystals ◽  
Dimensional Analysis ◽  
Size Effects ◽  
Surface Effect ◽  
Analysis Model ◽  
Size Dependent ◽  
Nano Scale ◽  
Geometric Size ◽  
Metal Single Crystals

Due to the relatively high surface-to-volume ratio, the surface effect can be significant for micro/nano-scale materials. This paper focuses on geometric size-dependent strength mechanisms of micro/nano-scale metal single crystals. A dimensional analysis model relating surface energy with the geometric size-dependent yield strength is presented and compared with results of microscale uniaxial compression tests on Ni and Au single crystals. The results indicate this model can predict the geometric size effects on the yield strength of micro/nano-scale metal single crystals.

scholarly journals SIZE-DEPENDENT ELASTIC MODULUS AND FRACTURE TOUGHNESS OF THE NANOFILM WITH SURFACE EFFECTS

2008 ◽  
Vol 15 (05) ◽  
pp. 599-603 ◽  
Author(s):  
JIAN-GANG GUO ◽  
LI-JUN ZHOU ◽  
YA-PU ZHAO
Keyword(s):  
Fracture Toughness ◽  
Elastic Modulus ◽  
Surface Energy ◽  
Size Effects ◽  
Interatomic Potential ◽  
Effective Elastic Modulus ◽  
Surface Effects ◽  
Surface Relaxation ◽  
Ideal Crystal ◽  
Size Dependent

The effective elastic modulus and fracture toughness of the nanofilm were derived with the surface relaxation and the surface energy taken into consideration by means of the interatomic potential of an ideal crystal. The size effects of the effective elastic modulus and fracture toughness were discussed when the thickness of the nanofilm was reduced. And the dependence of the size effects on the surface relaxation and surface energy was also analyzed.

scholarly journals Фазовая диаграмма состояния и межфазные характеристики в бинарной наносистеме

2018 ◽  
Vol 60 (1) ◽  
pp. 180
Author(s):  
М.А. Шебзухова ◽  
А.А. Шебзухов
Keyword(s):  
Interfacial Tension ◽  
Size Effects ◽  
Interfacial Layer ◽  
Phase State ◽  
Calculated Data ◽  
Size Composition ◽  
Size Dependent ◽  
State Diagrams ◽  
Monodispersed Particles ◽  
The Matrix

AbstractThe size effects on the composition of coexisting phases, the interfacial layer between them, and the interfacial tension in a binary system composed of a matrix and the monodispersed particles of arbitrary (including nanoscale) size are described in the context of a Gibbs method for dispersed systems. Obtaining the relevant relationships has allowed plotting the size-dependent phase state diagrams for a Cr–Ti system with a point of equal concentrations with a minimum. The coefficients of size composition of the nanoparticles and the matrix, as well as those of interfacial tension under the isobaric and isothermal conditions, are calculated at different degree of dispersion. The calculated data coincide with the experimental ones.

scholarly journals Size-Dependent Variability in Flow and Viscoelastic Behavior of Levan Produced by Gluconobacter albidus TMW 2.1191

Foods ◽  
2020 ◽  
Vol 9 (2) ◽  
pp. 192 ◽  
Author(s):  
Christoph Hundschell ◽  
Andre Braun ◽  
Daniel Wefers ◽  
Rudi Vogel ◽  
Frank Jakob
Keyword(s):  
Molecular Weight ◽  
Rheological Properties ◽  
Viscoelastic Fluid ◽  
Flow Behavior ◽  
Viscoelastic Behavior ◽  
Molecular Size ◽  
Size Dependent ◽  
Functionally Diverse ◽  
Insight Into ◽  
Water Kefir

Levan is a fructan-type exopolysaccharide which is produced by many microbes from sucrose via extracellular levansucrases. The hydrocolloid properties of levan depend on its molecular weight, while it is unknown why and to what extent levan is functionally diverse depending on its size. The aim of our study was to gain deeper insight into the size-dependent functional variability of levan. For this purpose, levans of different sizes were produced using the water kefir isolate Gluconobacter albidus TMW 2.1191 and subsequently rheologically characterized. Three levan types could be identified, which are similarly branched, but differ significantly in their molecular size and rheological properties. The smallest levan (<107 Da), produced without adjustment of the pH, exhibited Newton-like flow behavior up to a specific concentration of 25% (w/v). By contrast, larger levans (>108 Da) produced at pH ≥ 4.5 were shear-thinning, and the levan produced at pH 5.0 showed a gel-like behavior at 5% (w/v). A third (intermediate) levan variant was obtained through production in buffers at pH 4.0 and exhibited the properties of a viscoelastic fluid up to concentrations of 15% (w/v). Our study reveals that the rheological properties of levan are determined by its size and polydispersity, rather than by the amount of levan used or the structural composition.

Sign in / Sign up

Export Citation Format

Share Document