Local velocity of thermoresponsive colloidal gels in rate-driven flow

2021 ◽  
Vol 33 (3) ◽  
pp. 033113
Author(s):  
Kristine M. Smith ◽  
Adriana San-Miguel ◽  
Lilian C. Hsiao
Keyword(s):  
Colloidal Gels ◽  
Local Velocity

Elasticity of colloidal gels: structural heterogeneity, floppy modes, and rigidity

Soft Matter ◽  
2021 ◽  
Author(s):  
D. Zeb Rocklin ◽  
Lilian C Hsiao ◽  
Megan E Szakasits ◽  
Michael J Solomon ◽  
Xiaoming Mao
Keyword(s):  
Coordination Number ◽  
Volume Fraction ◽  
Structural Parameters ◽  
Structural Heterogeneity ◽  
Colloidal Gels ◽  
Shear Moduli ◽  
Rheological Measurements

Rheological measurements of model colloidal gels reveal that large variations in the shear moduli as colloidal volume-fraction changes are not reflected by simple structural parameters such as the coordination number,...

Consolidation of Strong Colloidal Gels Under Arbitrary Compressive Loadings

Soft Matter ◽  
2020 ◽  
Author(s):  
Mohammad Manjiul Islam ◽  
Daniel Lester
Keyword(s):  
Colloidal Gels ◽  
One Dimensional ◽  
Constitutive Theories

Although highly successful, classical constitutive theories for the consolidation of strong colloidal gels are limited to one-dimensional (1D) uniaxial consolidation. Many consolidation applications are inherently multidimensional and there currently exists...

Smart membranes by electron beam cross-linking of copolymer microgels

Soft Matter ◽  
2021 ◽  
Author(s):  
Johannes Bookhold ◽  
Lars Wiehemeier ◽  
Maxim Dirksen ◽  
Sebastian Knust ◽  
Dario Anselmetti ◽  
...  
Keyword(s):  
Electron Beam ◽  
Cross Linking ◽  
Colloidal Gels ◽  
Free Standing ◽  
Copolymer Microgels

Poly(N-isopropylacrylamide) (pNIPAM) based copolymer microgels were used to create free-standing, transferable, thermoresponsive membranes. The microgels were synthesized by copolymerization of NIPAM with N-benzylhydrylacrylamide (NBHAM). Monolayers of these colloidal gels were...

Analysis of local velocity gradients in rapid mixer using particle image velocimetry technique

2002 ◽  
Vol 2 (5-6) ◽  
pp. 47-55
Author(s):  
N.-S. Park ◽  
H. Park
Keyword(s):  
Particle Image Velocimetry ◽  
Particle Image ◽  
Velocity Fields ◽  
Local Velocity ◽  
Mixing Condition ◽  
Particle Image Velocimetry Technique ◽  
Velocity Gradients ◽  
Image Velocimetry ◽  
Current Design ◽  
G Value

Recognizing the significance of factual velocity fields in a rapid mixer, this study focuses on analyzing local velocity gradients in various mixer geometries with particle image velocimetry (PIV) and comparing the results of the analysis with the conventional G-value, for reviewing the roles of G-value in the current design and operation practices. The results of this study clearly show that many arguments and doubts are possible about the scientific correctness of G-value, and its current use. This is because the G-value attempts to represent the turbulent and complicated factual velocity field in a jar. Also, the results suggest that it is still a good index for representing some aspects of mixing condition, at least, mixing intensity. However, it cannot represent the distribution of velocity gradients in a jar, which is an important factor for mixing. This study as a result suggests developing another index for representing the distribution to be used with the G-value.

Axisymmetric Stokes flow past a spherical cap

1976 ◽  
Vol 75 (2) ◽  
pp. 273-286 ◽  
Author(s):  
J. M. Dorrepaal ◽  
M. E. O'neill ◽  
K. B. Ranger
Keyword(s):  
Vortex Ring ◽  
Stokes Flow ◽  
Concave Surface ◽  
Local Velocity ◽  
Oncoming Flow ◽  
Spherical Cap ◽  
Stream Surface ◽  
Flow Past ◽  
Mainstream Flow

The axisymmetric streaming Stokes flow past a body which contains a surface concave to the fluid is considered for the simplest geometry, namely, a spherical cap. It is found that a vortex ring is attached to the concave surface of the cap regardless of whether the oncoming flow is positive or negative. A stream surface ψ = 0 divides the vortex from the mainstream flow, and a detailed description of the flow is given for the hemispherical cup. The local velocity and stress in the vicinity of the rim are expressed in terms of local co-ordinates.

The measurement of local velocity of solid particles

1977 ◽  
Vol 18 (2) ◽  
pp. 171-178 ◽  
Author(s):  
K. Oki ◽  
W.P. Walawender ◽  
L.T. Fan
Keyword(s):  
Solid Particles ◽  
Local Velocity

Drug-loading colloidal gels assembled from polymeric nanoparticles as an anti-inflammatory platform

2021 ◽  
Author(s):  
Jinkun Yin ◽  
Yaoqing Chu ◽  
Si-Jian Pan ◽  
Lianjiang Tan
Keyword(s):  
Efficient Method ◽  
Polymeric Nanoparticles ◽  
Drug Loading ◽  
Direct Injection ◽  
Colloidal Gels ◽  
Local Inflammation ◽  
Inflammatory Drugs ◽  
Anti Inflammatory

Precise treatment of local inflammation is always challenging. Administration of anti-inflammatory drugs by direct injection has been considered as an efficient method for inflammation inhibition. In the present work, injectable...

Superposed shear and compression of strong colloidal gels

2021 ◽  
Vol 65 (5) ◽  
pp. 837-853
Author(s):  
M. M. Islam ◽  
D. R. Lester
Keyword(s):  
Colloidal Gels
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