The Impact of Surface Heterogeneity on Particle Deposition Melissa Sy Department of Chemical Engineering California State Polytechnic University, Pomona.

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Presentation transcript:

The Impact of Surface Heterogeneity on Particle Deposition Melissa Sy Department of Chemical Engineering California State Polytechnic University, Pomona Presentation for Bioengineering Research In Technical Excellence (BRITE program) 2008

Outline  Background  Research Objective  Experimental Approach  Results & Discussion  Conclusion

Background  An undesired attachment and accumulation of organisms on surfaces in an aqueous environment  Universal problem  High costs Biofouling is a problem…

Biofilm Developmental Process Target

Why Colloids? Governing forces: DLVO type: Van der Waals attraction Electrostatic interaction Specific interactions: Electrosteric interaction and hydrophobic interaction, etc. Microorganism Adhesion = Function of solution chemistry, microorganism heterogeneity, substratum heterogeneity, growth phase, hydrodynamic condition, etc.

Objectives  How does surface roughness influence the attachment behavior (physical heterogeneity)?  What effects do zeolite coatings have on deposition (chemical heterogeneity)?

Experimental Setup

Quantifying Colloid Deposition Total flow rate = 2 C o = 2x10 7 * microscope viewing area (204.7 mm × mm)

Results & Discussion

Stainless Steel Comparison Mirror finish unpolished 600-grit polished

Aluminum Alloy Comparison unpolished 600-grit polished 1200-grit polished

SEM of ZSM-5 coated Al & SS Aluminum AlloyStainless Steel top side

Zeta Potential (mV) ± ± ± 0.49CML colloids * ± ± 0.25 ZSM-5 coating * ± ± 0.69 Stainless Steel * ± ± 0.16Aluminum 100 mM10 mM1 mM * Not available due to the Electro Kinetic Analyzer limitation

Colloid Deposition Results in KNO 3

Zeta Potential (mV) ± ± ± 0.49CML colloids * ± ± 0.25 ZSM-5 coating * ± ± 0.69 Stainless Steel * ± ± 0.16Aluminum 100 mM10 mM1 mM * Not available due to the Electro Kinetic Analyzer limitation

Colloid Deposition Results in KNO 3

Conclusions 1. Surface roughness is a controlling factor on particle deposition at low ionic strength in which system entails a weak electric double layer. 2.The electric double layer dominates the deposition rate at higher ionic strengths and similar surface charges. 3.ZSM-5 coatings decrease deposition rate when compared to bare metal surface counterparts at low ionic strength.

Acknowledgements  Dr Sharon Walker  Gexin Chen  Jun Wang  National Science Foundation  UCR Bacterial Adhesion Research Laboratory members (Amy, James)  Rajwant S. Bedi  Thanks to Dr. Yushan Yan for provision of zeolite coated surfaces

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