PMID- 29528846
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20191120
IS  - 1361-6528 (Electronic)
IS  - 0957-4484 (Linking)
VI  - 29
IP  - 23
DP  - 2018 Jun 8
TI  - Ultrathin nanoporous membranes for insulator-based dielectrophoresis.
PG  - 235704
LID - 10.1088/1361-6528/aab5f7 [doi]
AB  - Insulator-based dielectrophoresis (iDEP) is a simple, scalable mechanism that can 
      be used for directly manipulating particle trajectories in pore-based filtration 
      and separation processes. However, iDEP manipulation of nanoparticles presents 
      unique challenges as the dielectrophoretic force [Formula: see text] exerted on 
      the nanoparticles can easily be overshadowed by opposing kinetic forces. In this 
      study, a molecularly thin, SiN-based nanoporous membrane (NPN) is explored as a 
      breakthrough technology that enhances [Formula: see text] By numerically 
      assessing the gradient of the electric field square [Formula: see text]-a common 
      measure for [Formula: see text] magnitude-it was found that the unique 
      geometrical features of NPN (pore tapering, sharp pore corner and ultrathin 
      thickness) act in favor of intensifying the overall [Formula: see text] A 
      comparative study indicated that [Formula: see text] generated in NPN are four 
      orders of magnitude larger than track-etched polycarbonate membranes with 
      comparable pore size. The stronger [Formula: see text] suggests that iDEP can be 
      conducted under lower voltage bias with NPN: reducing joule heating concerns and 
      enabling solutions to have higher ionic strength. Enabling higher ionic strength 
      solutions may also extend the opportunities of iDEP applications under 
      physiologically relevant conditions. This study also highlights the effects of 
      [Formula: see text] induced by the ion accumulation along charged surfaces 
      (electric-double layer (EDL)). EDL-based [Formula: see text] exists along the 
      entire charged surface, including locations where geometry-based iDEP is 
      negligible. The high surface-to-volume ratio of NPN offers a unique platform for 
      exploiting such EDL-based DEP systems. The EDL-based [Formula: see text] was also 
      found to offset the geometry-based [Formula: see text] but this effect was easily 
      circumvented by reducing the EDL thickness (e.g. increasing the ionic strength 
      from 0.1 to 100 mM). The results from this study imply the potential application 
      of iDEP as a direct, in-operando antifouling mechanism for ultrafiltration 
      technology, and also as an active tuning mechanism to control the cut-off size 
      limit for continuous selectivity of nanomembrane-based separations.
FAU - Mukaibo, Hitomi
AU  - Mukaibo H
AD  - Department of Chemical Engineering, University of Rochester, NY, United States of 
      America.
FAU - Wang, Tonghui
AU  - Wang T
FAU - Perez-Gonzalez, Victor H
AU  - Perez-Gonzalez VH
FAU - Getpreecharsawas, Jirachai
AU  - Getpreecharsawas J
FAU - Wurzer, Jack
AU  - Wurzer J
FAU - Lapizco-Encinas, Blanca H
AU  - Lapizco-Encinas BH
FAU - McGrath, James L
AU  - McGrath JL
LA  - eng
PT  - Journal Article
DEP - 20180312
PL  - England
TA  - Nanotechnology
JT  - Nanotechnology
JID - 101241272
EDAT- 2018/03/13 06:00
MHDA- 2018/03/13 06:01
CRDT- 2018/03/13 06:00
PHST- 2018/03/13 06:00 [pubmed]
PHST- 2018/03/13 06:01 [medline]
PHST- 2018/03/13 06:00 [entrez]
AID - 10.1088/1361-6528/aab5f7 [doi]
PST - ppublish
SO  - Nanotechnology. 2018 Jun 8;29(23):235704. doi: 10.1088/1361-6528/aab5f7. Epub 
      2018 Mar 12.