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Dlvo Approximation Methods For Predicting The Attachment Of Silver Nanoparticles To Ceramic Membranes, Anne M. Mikelonis, Sungmin Youn, Desmond F. Lawler
Dlvo Approximation Methods For Predicting The Attachment Of Silver Nanoparticles To Ceramic Membranes, Anne M. Mikelonis, Sungmin Youn, Desmond F. Lawler
All Engineering Faculty Research
This article examines the influence of three common stabilizing agents (citrate, poly(vinylpyrrolidone) (PVP), and branched poly(ethylenimine) (BPEI)) on the attachment affinity of silver nanoparticles to ceramic water filters. Citrate-stabilized silver nanoparticles were found to have the highest attachment affinity (under conditions in which the surface potential was of opposite sign to the filter). This work demonstrates that the interaction between the electrical double layers plays a critical role in the attachment of nanoparticles to flat surfaces and, in particular, that predictions of double-layer interactions are sensitive to boundary condition assumptions (constant charge vs constant potential). The experimental deposition results can …
Comprehensive Understanding Of Nano-Sized Particle Separation Processes Using Nanoparticle Tracking Analysis, Desmond F. Lawler, Sungmin Youn, Tongren Zhu, Ijung Kim, Boris L.T. Lau
Comprehensive Understanding Of Nano-Sized Particle Separation Processes Using Nanoparticle Tracking Analysis, Desmond F. Lawler, Sungmin Youn, Tongren Zhu, Ijung Kim, Boris L.T. Lau
All Engineering Faculty Research
Understanding of nano-sized particle separation processes has been limited by difficulties of nanoparticle characterization. In this study, nanoparticle tracking analysis (NTA) was deployed to evaluate the absolute particle size distributions in laboratory scale flocculation and filtration experiments with silver nanoparticles. The results from NTA were consistent with standard theories of particle destabilization and transport. Direct observations of changes in absolute particle size distributions from NTA enhance both qualitative and quantitative understanding of particle separation processes of nano-sized particles.
Silver Nanoparticle Removal From Drinking Water: Flocculation/Sedimentation Or Filtration?, Desmond F. Lawler, Anne M. Mikelonis, Ijung Kim, Boris L.T. Lau, Sungmin Youn
Silver Nanoparticle Removal From Drinking Water: Flocculation/Sedimentation Or Filtration?, Desmond F. Lawler, Anne M. Mikelonis, Ijung Kim, Boris L.T. Lau, Sungmin Youn
All Engineering Faculty Research
Silver nanoparticles are used in a wide variety of consumer products and are therefore rapidly becoming ubiquitous in the natural environment; they can be expected to be found in the natural waters used as drinking water supplies. This research investigated whether such particles could be expected to be removed in conventional water treatment plants such as flocculation and filtration. Both flocculation and granular media filtration experiments with citrate-capped silver nanoparticles were performed at different ionic strengths and in the presence and absence of natural organic matter. The results were generally consistent with theories of particle destabilization that have been developed …