Attractive and Repulsive Electrostatic Forces between Positively Charged Latex Particles in the Presence of Anionic Linear Polyelectrolytes

2010 ◽  
Vol 114 (9) ◽  
pp. 3170-3177 ◽  
Author(s):  
Ionel Popa ◽  
Graeme Gillies ◽  
Georg Papastavrou ◽  
Michal Borkovec
Keyword(s):  
Electrostatic Forces ◽  
Latex Particles ◽  
Positively Charged

Fig. 9 Freeze fracture electron micrograph of ELimixed phosphoinositides (4:1) liposomes after 10 passes through a0.1 pirn polycarbonate filter. growth, particularly during storage, would be undesirable in most products. Fortunately the tendency of liposomes to aggregate and fuse can be controlled by the inclusion of small amounts of negatively charged lipids such as PS or PG or positively charged amphiphiles such as stearylamine in the formulation. Knowing the number and the sign of charged groups added and the valency and concentration of electrolytes in the me-dium, the magnitude of the electrostatic forces generated by these charged groups can be closely approximated by using the double layer theory. These results can then be correlated with physical stability of liposomes and used to guide formulation efforts. The amount of charged component and ionic conditions in a particular liposome dos-age form can be adjusted to produce a high-enough zeta potential to inhibit close ap-proach of vesicles and prevent their aggregation. In practice it is usually necessary to determine empirically the magnitude of the zeta potential required to prevent aggrega-tion in a particular system. However, once this has been done, it is possible to use the zeta potential as a quality control check to insure that each batch of liposomes contains sufficient charged groups to avoid aggregation during storage.

1998 ◽  
pp. 84-108
Keyword(s):  
Quality Control ◽  
Zeta Potential ◽  
Physical Stability ◽  
Freeze Fracture ◽  
Electron Micrograph ◽  
Electrostatic Forces ◽  
Quality Control Check ◽  
Charged Component ◽  
Fracture Electron ◽  
Positively Charged

Adsorption of oligonucleotides onto negatively and positively charged latex particles

1994 ◽  
Vol 83 (1) ◽  
pp. 25-31 ◽  
Author(s):  
A. Elaissari ◽  
P. Cros ◽  
C. Pichot ◽  
V. Laurent ◽  
B. Mandrand
Keyword(s):  
Latex Particles ◽  
Positively Charged

Preparation and characterization of Ag/AgO nanoshells on carboxylated polystyrene latex particles

2006 ◽  
Vol 21 (2) ◽  
pp. 349-354 ◽  
Author(s):  
Rongwei Zhang ◽  
Dan Zhang ◽  
Hui Mao ◽  
Wenlong Song ◽  
Ge Gao ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Polystyrene Latex ◽  
Infrared Transmission ◽  
X Ray Diffraction ◽  
Latex Particles ◽  
Transmission Electron ◽  
Polystyrene Latex Particles ◽  
Subsequent Decomposition ◽  
Positively Charged

Smooth and uniform Ag/AgO nanoshells (about 3–4 nm) on carboxylated polystyrene latex particles were prepared by electrostatic attraction between negatively charged –COO− on the surface of carboxylated polystyrene latex particles and positively charged Ag(NH3)2+ in the solution, and subsequent decomposition of the silver complex. The resultant nanoparticles were characterized with Fourier transform infrared, transmission electron microscopy, scanning electron microscopy, and x-ray diffraction. The effects of reducing agents, the amount of NaOH and temperature on the morphology of hybrid latex particles were discussed.

Human Fibrinogen Adsorption on Positively Charged Latex Particles

Langmuir ◽  
2014 ◽  
Vol 30 (37) ◽  
pp. 11165-11174 ◽  
Author(s):  
Paulina Żeliszewska ◽  
Anna Bratek-Skicki ◽  
Zbigniew Adamczyk ◽  
Michał Cieśla
Keyword(s):  
Human Fibrinogen ◽  
Latex Particles ◽  
Positively Charged ◽  
Fibrinogen Adsorption

Adsorption and Desorption Studies of Polyadenylic Acid onto Positively Charged Latex Particles

Langmuir ◽  
1995 ◽  
Vol 11 (4) ◽  
pp. 1261-1267 ◽  
Author(s):  
Abdelhamid Elaiessari ◽  
Christian Pichot ◽  
Thierry Delair ◽  
Philippe Cros ◽  
Robin Kuerfurst
Keyword(s):  
Adsorption And Desorption ◽  
Latex Particles ◽  
Polyadenylic Acid ◽  
Positively Charged

scholarly journals Drop race: How electrostatic forces influence drop motion

2021 ◽  
Author(s):  
Xiaomei Li ◽  
Pravash Bista ◽  
Amy Stetten ◽  
Henning Bonart ◽  
Maximilian Schür ◽  
...  
Keyword(s):  
Negative Charge ◽  
Equation Of Motion ◽  
Electrostatic Forces ◽  
Tilted Surface ◽  
Novel Approach ◽  
Drop Motion ◽  
Water Drops ◽  
Inclined Planes ◽  
Low Permittivity ◽  
Positively Charged

Abstract Water drops sliding down inclined planes are an everyday phenomenon and are important in many technical applications. Previous understanding is that the motion is mainly dictated by viscous and capillary forces. Here we demonstrate that, in addition to these forces, drops on hydrophobic surfaces are affected by self-generated electrostatic forces. In a novel approach to determine forces on moving drops we imaged their trajectory when sliding down a tilted surface and apply the equation of motion. We found that drop motion on low-permittivity substrates is significantly influenced by electrostatic forces. Sliding drops deposit a negative charge on the surface, which interact with the positively charged drops. We derive an analytical model to describe the force and validate it by numerical computations. The results indicate how to describe and facilitate drop motion in applications, such as in microfluidics, water management on car surfaces, and the creation of sliding drop electrical generators.

Protamine-DNA interaction

1978 ◽  
Vol 36 (2) ◽  
pp. 200-201
Author(s):  
D.P. Bazett-Jones ◽  
F.P. Ottensmeyer
Keyword(s):  
Small Volume ◽  
Double Helix ◽  
Dna Interaction ◽  
Dark Field ◽  
Sperm Head ◽  
Nuclear Proteins ◽  
Field Electron Microscopy ◽  
Dark Field Electron ◽  
Dna Double Helix ◽  
Positively Charged

Dark field electron microscopy has been used for the study of the structure of individual macromolecules with a resolution to at least the 5Å level. The use of this technique has been extended to the investigation of structure of interacting molecules, particularly the interaction between DNA and fish protamine, a class of basic nuclear proteins of molecular weight 4,000 daltons.Protamine, which is synthesized during spermatogenesis, binds to chromatin, displaces the somatic histones and wraps up the DNA to fit into the small volume of the sperm head. It has been proposed that protamine, existing as an extended polypeptide, winds around the minor groove of the DNA double helix, with protamine's positively-charged arginines lining up with the negatively-charged phosphates of DNA. However, viewing protamine as an extended protein is inconsistent with the results obtained in our laboratory.

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