Colloidal Properties of Latex Particles

1990 ◽  
pp. 129-157 ◽  
Author(s):  
R. H. Ottewill
Keyword(s):  
Latex Particles ◽  
Colloidal Properties

Composition and Colloidal Properties of Balata Latex

1939 ◽  
Vol 12 (3) ◽  
pp. 470-481
Author(s):  
A. R. Kemp
Keyword(s):  
Refractive Index ◽  
Average Diameter ◽  
Water Soluble ◽  
Effect Of Temperature ◽  
Complete Analysis ◽  
Similar Data ◽  
White Variety ◽  
Latex Particles ◽  
Colloidal Properties ◽  
Water Soluble Substance

Abstract This paper reports the composition and colloidal properties of two types of balata latex from Dutch Guiana. The white variety is shown to be superior to the red, owing to its higher content of hydrocarbon. It is shown that balata latex is very stable due to the presence of a highly protective water-soluble substance in its serum. It cannot be coagulated by acids or salts but is readily coagulated by alcohol or acetone. The balata latex particles are spherical and vary in diameter from about 0.1 to 2.5 microns with an average diameter of about 0.5 micron. The balata latex particles are shown to enclose the resins, which appear to be present in a dispersed state in the hydrocarbon. The particles are shown to contain about 18% of water, determined as water of retention in pressed coagulum. The “resins” have been separated from both types of balata latex as water-white viscous liquids, which deposit crystals of β-amyrin acetate on standing. The red balata latex resin is shown to be more viscous than the white and to differ from it as regards its iodine value, refractive index and solubility in cold 95% ethyl alcohol. The serum components have been separated into four main fractions: protein, carbohydrate, gummy substance and ash. Minor components such as tannin and amino acid have also been noted. A complete analysis of balata ash has been made and compared with the analysis of ash from Hevea latex by Bruce. Balata ash was found to contain higher contents of CaO, Na2O, and MgO and lower contents of K2O and P2O6 than Hevea latex ash. New data are presented on the density, refractive index, dielectric constant and heat of combustion of balata hydrocarbon which are believed to be more reliable than similar data previously available in the literature. Data on the effect of temperature on the refractive index of balata and gutta-percha hydrocarbons are presented, showing the crystallization of the gutta hydrocarbon on cooling, which starts at about 37° C. resulting in an abrupt increase in refractive index occurring between 37° and 35° C.

A Freeze Shadow Technique for the Preparation of Soft Paint Latexes for Electron Microscopy

1977 ◽  
Vol 35 ◽  
pp. 314-315
Author(s):  
Earl R. Walter ◽  
Glen H. Bryant
Keyword(s):  
Sample Preparation ◽  
High Vacuum ◽  
Vacuum System ◽  
Latex Particles ◽  
New Methods ◽  
Diffusion Pump ◽  
Film Forming ◽  
Routine Basis ◽  
Distribution Studies ◽  
Preparation Techniques

With the development of soft, film forming latexes for use in paints and other coatings applications, it became desirable to develop new methods of sample preparation for latex particle size distribution studies with the electron microscope. Conventional latex sample preparation techniques were inadequate due to the pronounced tendency of these new soft latex particles to distort, flatten and fuse on the substrate when they dried. In order to avoid these complications and obtain electron micrographs of undistorted latex particles of soft resins, a freeze-dry, cold shadowing technique was developed. The method has now been used in our laboratory on a routine basis for several years.The cold shadowing is done in a specially constructed vacuum system, having a conventional mechanical fore pump and oil diffusion pump supplying vacuum. The system incorporates bellows type high vacuum valves to permit a prepump cycle and opening of the shadowing chamber without shutting down the oil diffusion pump. A baffeled sorption trap isolates the shadowing chamber from the pumps.

Increased Protein Synthesis by Human Platelets during Phagocytosis of Latex Particles in Vitro

1976 ◽  
Vol 35 (02) ◽  
pp. 350-357 ◽  
Author(s):  
Hana Bessler ◽  
Galila Agam ◽  
Meir Djaldetti
Keyword(s):  
Protein Synthesis ◽  
Fold Increase ◽  
Human Platelets ◽  
Polystyrene Latex ◽  
Latex Particles ◽  
The Third ◽  
Platelet Protein ◽  
Dose Dependent ◽  
Phagocytotic Activity

SummaryA three-fold increase of protein synthesis by human platelets during in vitro phagocytosis of polystyrene latex particles was detected. During the first two hours of incubation, the percentage of phagocytizing platelets and the number of latex particles per platelet increased; by the end of the third hour, the first parameter remained stable, while the number of latex particles per cell had decreased.Vincristine (20 μg/ml of cell suspension) inhibited platelet protein synthesis. This effect was both time- and dose-dependent. The drug also caused a decrease in the number of phagocytizing cells, as well as in their phagocytotic activity.

Recent Applications of Nonradiative Energy Transfer to Polymer Studies

1993 ◽  
Vol 58 (10) ◽  
pp. 2266-2271 ◽  
Author(s):  
Herbert Morawetz
Keyword(s):  
Energy Transfer ◽  
Polymer Chain ◽  
Cluster Formation ◽  
Nonradiative Energy Transfer ◽  
Molecular Cluster ◽  
Fluorescent Labels ◽  
Latex Particles ◽  
Polymer Latex

Recent studies of polymers in solution and in bulk by energy transfer between two fluorescent labels are reviewed. Such studies are concerned with the equilibrium and dynamics of polymer chain expansion, molecular cluster formation in solution, the miscibility of polymers in bulk, and the interdiffusion of polymer latex particles.

Synthesis and Characterization of Polypyrrole-Coated Sulfur-Rich Latex Particles:  New Synthetic Mimics for Sulfur-Based Micrometeorites

2006 ◽  
Vol 18 (11) ◽  
pp. 2758-2765 ◽  
Author(s):  
Syuji Fujii ◽  
Steven P. Armes ◽  
Richard Jeans ◽  
Robin Devonshire ◽  
Samantha Warren ◽  
...  
Keyword(s):  
Synthesis And Characterization ◽  
Latex Particles

scholarly journals Cellulose Nanocrystals Mimicking Micron-Sized Fibers to Assess the Deposition of Latex Particles on Cotton

2021 ◽  
Author(s):  
Evdokia K. Oikonomou ◽  
Konstantin Golemanov ◽  
Pierre-Emmanuel Dufils ◽  
James Wilson ◽  
Ritu Ahuja ◽  
...  
Keyword(s):  
Cellulose Nanocrystals ◽  
Latex Particles
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