Effect of Particle Diameter on Exclusion-zone Size

Effect of Particle Diameter on Exclusion-zone Size

D.T. Nhan
G.H. Pollack

Department of Bioengineering, University of Washington, Seattle, WA 98195, USA.

Page: 
139-144
|
DOI: 
https://doi.org/10.2495/DNE-V6-N2-139-144
Received: 
N/A
|
Accepted: 
N/A
|
Published: 
2 June 2011
| Citation

OPEN ACCESS

Abstract: 

Particles and solutes are excluded from the vicinity of hydrophilic surfaces, leaving large microsphere-free regions known as exclusion zones (EZs). Prior work had indicated that EZs could extend to distances of up to several hundred micrometers from the nucleating surface. These observations were made on large, extended surfaces, leaving open the question whether EZ size might depend on the characteristic dimension of the excluding surface. We placed one or few ion-exchange-resin beads whose diameters varied from 15 µm to 300 µm in cuvettes. The beads were suffused with aqueous microsphere suspensions for observing the surfaces’ exclusionary behavior. Results showed a direct relation between bead size and EZ size over the full range of bead diameter, implying a similar relation for smaller particles or molecules, perhaps extending beyond the resolution of the light microscope.

Keywords: 

Colloidal particles, exclusion zone, hydrophilic surfaces, ion-exchange resin beads

  References

[1] Zheng, J.M. & Pollack, G.H., Long range forces extending from polymer surfaces. Phys Rev E, 68, p. 031408, 2003. doi:10.1103/PhysRevE.68.031408

[2] Nagornyak, E., Yoo, H. & Pollack, G.H., Mechanism of attraction between like-charged particles in aqueous solution. Soft Matter, 5, pp. 3850–3857, 2009. doi:10.1039/b905080a

[3] Zheng, J.M., Wexler, A. & Pollack, G.H., Effect of buffers on aqueous solute-exclusion zones around ion-exchange resins. J. Colloid Interface Sci., 332, pp. 511–514, 2009. 

doi:10.1016/j.jcis.2009.01.010

[4] Zheng, J.M. & Pollack, G.H., Solute exclusion and potential distribution near hydrophilic surfaces. Water and the Cell, ed. G.H. Pollack, I.L. Cameron, & D.N. Wheatley, Springer, The Netherlands, pp. 165–174, 2006.

[5] Bhalerao, A. & Pollack, G.H., Light-induced effects on Brownian displacements, submitted. J Biophotonics, 1–7, 2010, doi: 10.1002/jbio.201000097.

[6] Chai, B., Yoo, H. & Pollack, G.H., Effect of radiant energy on near-surface water. J. Phys. Chem. B, 113, pp. 13953–13958, 2009.

[7] Zhao, Q., Zheng, J.M., Chai, B. & Pollack, G.H., Unexpected effect of light on colloid crystal Spacing. Langmuir, 24, pp. 1750–1755, 2008.

[8] Yoo, H., Baker, D.R., Pirie, C.M., Hovakeemian, B. & Pollack, G.H., Characteristics of water adjacent to hydrophilic interfaces. Water, the Forgotten Biological Molecule, ed. D. LeBihan & H. Fukuyama, Pan Stanford Publishing Pte. Ltd., 2010.