I would like to share a collection of high resolution SEM images of nanopores of polycarbonate track-etch (PCTE) membrane.  These nanopores have very high pore length-to-diameter aspect ratio of 6000 nm / 25 nm.  I hope you find them useful.…

It is expecting that the high electric field gradient at the nanopore entrance could amplify the dielectrophoretic force so that the nanoparticles transported toward the membrane could be manipulated based on their polarizabilities.  To prove the concept, the electric field…

Porous metal-organic framework (MOF) crystal is obtained by precipitation after mixing an aqueous solution of cadmium nitrate and the solution of 4,4’-bipyridine in anhydrous ethanol.  It is found that the crystallization occurred when ethanol evaporated from the mixture.  As a…

Please see the attachment: Crystal Growth inside Nanopores

Presentation in this post is based on the paper entitled “Large Area Synthesis of a Nanoporous Two-Dimensional Polymer at the Air/Water Interface”. Paper: Murray(King)JACS15 Supporting Information: Murray(King)JACS15 – SI Presentation Slides (PDF): Two-Dimensional Porous Membranes    

Principle of Operation The electrokinetic properties of charged membrane make it possible for conversion between the electrical and mechanical regimes. The electroosmosis is an example of converting from the electrical to mechanical powers. In reverse, exchanging the mechanical energy for…

It was expected that heating up the substrate during Au sputtering would help increase mobility of Au into nanopores so that the uniform coating on pore wall could be achieved.  The result was quite unexpected; Au did not coat uniformly on…

Update: After doing several measurements again, it appears that the data shown below were not repeatable.  It is believed that these data were just the artifact.  Please see my new blog post “Flow Sensing and Energy Harvesting Capabilities of NPN Membrane” for…

A change in open-circuit potential, measured across a pnc-Si membrane, in response to a fluctuation in flow rate of electrolyte solution exhibits a promising flow-sensing capability of the membrane.  To demonstrate this correlation, the open-circuit potentials were measured under a…