Surface-Tension-Driven Flow Due to the Adsorption and Desorption of Colloidal Particles

2001 ◽  
Vol 242 (2) ◽  
pp. 279-283 ◽  
Author(s):  
Kenneth Casson ◽  
Duane Johnson
Keyword(s):  
Surface Tension ◽  
Colloidal Particles ◽  
Adsorption And Desorption

The Effects of Surfactants on the Morphology of Colloidal Crystals in Self-assembly

2006 ◽  
Vol 942 ◽  
Author(s):  
Zuocheng Zhou ◽  
Qin Li ◽  
Likui Wang ◽  
Xiusong Zhao
Keyword(s):  
Crystal Structure ◽  
Surface Tension ◽  
Contact Angle ◽  
Self Assembly ◽  
Colloidal Particles ◽  
Colloidal Suspension ◽  
Sodium Dodecyl ◽  
Colloidal Crystals ◽  
Phase Contact ◽  
Surfactant Solutions

AbstractIn this research, sodium dodecyl sulfates (SDS) and N-cetyl-n,n,n-trimethyammonium bromide (CTAB) surfactant solutions are used as solvents of polystyrene (PS) colloidal suspension during the fabrication of colloidal crystals. The effects of the surfactant on the quality and the morphology of the colloidal crystals are studied. It was found that surfactants not only change the charge of PS colloidal particles, but also significantly changed the surface tension and the 3 phase contact angle of the suspension with respect to the glass substrate, in turn they change the thickness of the formed crystal as well as the crystal structure. The derived knowledge will be potentially useful in clarifying the mechanisms involved in the formation of colloidal crystals.

MODELING OF THE SURFACE TENSION OF COLLOIDAL SUSPENSIONS

2016 ◽  
Vol 24 (04) ◽  
pp. 1750050 ◽  
Author(s):  
ROGHAYEH HADIDIMASOULEH ◽  
MAZIAR SAHBA YAGHMAEE ◽  
REZA RIAHIFAR ◽  
BABAK RAISSI
Keyword(s):  
Surface Tension ◽  
Colloidal Particles ◽  
Colloidal Suspension ◽  
Colloidal Suspensions ◽  
Thermodynamic Relation ◽  
Fundamental Properties ◽  
Bubble Pressure ◽  
Air Water Interface ◽  
Numerous Experimental Data ◽  
Modified Equation

Surface tension is one of the fundamental properties of the colloids, which can be altered by concentration and size of colloidal particles. In the current work, modeling of the surface tension of suspension as it would be analyzed by maximum bubble pressure method has been performed. A new modified equation to correlate the surface tension with the bubble pressure is derived by applying fundamental thermodynamic relation considering the presence of particles in suspension and curvature of the interface between the particles and bubbles inside liquid. Moreover, the change of particles concentration in air–water interface due to capillary force is also considered. The predicted surface tension using the developed model has been verified by numerous experimental data with deviation less than 5% in most of cases. It was found that the calculated surface tension is altered by contact angle and particle radius as well as particle concentration. The obtained model may have potential application to predict the surface tension of colloidal suspension.

STRUCTURES IN A MAGNETIC SUSPENSION SUBJECTED TO UNIDIRECTIONAL AND ROTATING FIELD

2002 ◽  
Vol 16 (17n18) ◽  
pp. 2279-2285 ◽  
Author(s):  
P. CARLETTO ◽  
G. BOSSIS ◽  
A. CEBERS
Keyword(s):  
Magnetic Field ◽  
Surface Tension ◽  
Thermodynamic Model ◽  
Colloidal Particles ◽  
Average Distance ◽  
Characteristic Size ◽  
Magnetic Suspension ◽  
Order Of Magnitude ◽  
The Magnetic Field ◽  
Rotating Field

Field induced structures are studied inside suspensions of magnetic colloidal particles of micronic size. We have characterized the average distance between aggregates in a thin cell with the magnetic field perpendicular to the plane and also in the presence of a rotating field with the plane of rotation perpendicular to the plane of the cell. The characteristic size of the mesostructure is predicted on the basis of a thermodynamic model. The theory well predicts the experimental results in the uniaxial case but not in the case of ae rotating field; in this last case, the surface tension which is needed to have a good fit is far too low compared to its expected order of magnitude. When the field is uniaxial and sinusoidal we have found a collective instability where all the aggregates are rotating simultaneously in a chaotic way.

Colloidal Particles in Competition for Stabilizer: A Solvent Relaxation NMR Study of Polymer Adsorption and Desorption

Langmuir ◽  
2012 ◽  
Vol 28 (48) ◽  
pp. 16588-16595 ◽  
Author(s):  
Catherine L. Cooper ◽  
Terence Cosgrove ◽  
Jeroen S. van Duijneveldt ◽  
Martin Murray ◽  
Stuart W. Prescott
Keyword(s):  
Colloidal Particles ◽  
Polymer Adsorption ◽  
Solvent Relaxation ◽  
Adsorption And Desorption ◽  
Nmr Study

scholarly journals A Note on Storing and Testing Gold Conjugates

2007 ◽  
Vol 15 (1) ◽  
pp. 44-44
Author(s):  
Jan Leunissen
Keyword(s):  
Colloidal Gold ◽  
Animal Species ◽  
Colloidal Particles ◽  
Particle Surface ◽  
Adsorption And Desorption ◽  
As Adsorption

Colloid and adsorption physics are a very complicated business and often have a lot of surprises. In 1991 Kramarcy and Sealock published a paper in JHC Vol. 39, No. 1,pp. 37-39, 1991: “Commercial Preparations of Colloidal Gold-Antibody Complexes Frequently Contain Free Active Antibody”. Their data indicate that proteins adsorbed onto colloidal particles of 5nm and larger can dissociate from the particle surface with time and that, at times even shortly after manufacturing, colloidal gold reagents may contain free binding molecules. This is not necessarily the result of bad manufacturing practice, as adsorption and desorption are in equilibrium at all times. Some proteins (there are even variations between antibodies from different animal species) are more liable to become dissociated than others, and the conditions of coupling play a role as well.

Immunoferritin localization of intracellular antigens in positively stained frozen sections

1978 ◽  
Vol 36 (2) ◽  
pp. 168-169
Author(s):  
K. T. Tokuyasu
Keyword(s):  
Surface Tension ◽  
Water Surface ◽  
Thin Layers ◽  
The Other ◽  
Positive Staining ◽  
Frozen Sections ◽  
The Past ◽  
Ultrathin Frozen Sections ◽  
Definition Of

During the past investigations of immunoferritin localization of intracellular antigens in ultrathin frozen sections, we found that the degree of negative staining required to delineate u1trastructural details was often too dense for the recognition of ferritin particles. The quality of positive staining of ultrathin frozen sections, on the other hand, has generally been far inferior to that attainable in conventional plastic embedded sections, particularly in the definition of membranes. As we discussed before, a main cause of this difficulty seemed to be the vulnerability of frozen sections to the damaging effects of air-water surface tension at the time of drying of the sections.Indeed, we found that the quality of positive staining is greatly improved when positively stained frozen sections are protected against the effects of surface tension by embedding them in thin layers of mechanically stable materials at the time of drying (unpublished).

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