Author: Jim
Professor McGrath holds a BS degree in Mechanical Engineering from Arizona State and a MS degree in Mechanical Engineering from MIT. He earned a PhD in Biological Engineering from Harvard/MIT's Division of Health Sciences and Technology. He then trained as a Distinguished Post-doctoral Fellow in the Department of Biomedical Engineering at the Johns Hopkins University. Professor McGrath has been on the Biomedical Engineering faculty at the University of Rochester since 2001 where he also served as the director of the graduate program in BME for more than a decade and currently serves as Associate Director of the URNano microfab and metrology core. Professor McGrath also has faculty affiliations with many other programs at UR including the Material Research Program, the Environmental Health and Sciences Center, the Biochemistry and Biophysics program, and the Musculoskeletal Research Center. McGrath's graduate, post-doctoral, and early faculty research was focused on quantitative experiments and mathematical modeling of cell migration covering molecular, cellular, and multi-cellular phenomena. This was true until 2007 when he, along with Professor Philippe Fauchet (now Dean at Vanderbilt) and PhD students Tom Gaborski (RIT) and Chris Streimer (Adarza), discovered a means to self-assembled nanopores in 15 nm thick free-standing silicon and demonstrated the remarkable transport properties of the new material in a Nature paper. This seminal discovery led to the creation of the multidisciplinary Nanomembrane Research Group (NRG) and the founding of SiMPore Inc. in the same year. The NRG and SiMPore have been dedicated to the advancement of ultrathin membrane technologies and exploring all of their potential applications ever since. This blog also dates back to 2007 and has had contributions from more than 100 students, faculty, scientists, engineers, and entrepreneurs. It contains over 2,500 pages and posts logging progress large and small over all these years. Yet somehow it feels like we are just getting started.

new chamber with brief description

As per Chris request, here is a photo with a brief description. Sorry the image is still not good… the surface of the plastic reflects lights and it is transparent, plus I am using a poor camera.  But I hope

Posted in NRG

new version of the diffusion chamber

Since Paul sent an email saying he will be on leave from this week, I spent some time in the hopeman metal workshop with Paul working on our second diffusion chamber before he leaves. We actually failed four substrates before

Posted in NRG

diffusion observed using the prototype chamber with background noise

Last week Jess and I did some diffusion tests using the prototype chamber. We observed there was some fluorescence background noise from the plastic substrate. So we decided to make the buffer well (the hole on the substrate) all the

Posted in NRG

R6G diffusion observed through the plastic substrate

The only problem is the diffusion is very fast with defects in there.

Posted in NRG

Polycarbonate Sheet — substrate material

I worked with Paul this afternoon and finally we highly suspect the raw material used for the prototype diffusion chamber could be Polycarbonate. Paul could not provide direct evidence for the material source since he did not keep any purchase

Posted in NRG

Question about observation through the plastic substrate of the new diffusion chamber

Attached are the photos taken under DIC and Rhodamine channels, using the new diffusion chamber. I can clearly observe Rhodamine pass to the lower hole of the chamber, under the Rhodamine channel by eye ball. But from what I got

Posted in NRG

Problems with the New Diffusion Chamber

I have tested the new diffusion chamber shown in a yesterday’s post. The idea of our original design works. But there are several problems with this prototype: – Paul used a very thick material to build the clamp, which blocks

Posted in NRG

New diffusion chamber prototype

Our new diffusion chamber is finally here. Take a look at the photos first – in our next group meeting you can see the real thing. Today I will test its usability and reliability. Please keep in mind this is

Posted in NRG

Electron Beam Evaporator Protocol

Electron Beam Evaporator Protocol (V_1.0) – Lingyun Here is the first version protocol of the electron beam evaporator at RIT clean room. There is not too much to put down here – the best way to learn this is to

Posted in NRG Tagged with: , , ,

New metal coated wafer#502

Wafer#502 was coated with 10nm_Ti & 15nm_Au on Friday. I will pick out pinhole free membranes later today. I will also try to get TEM images at Karen’s lab (medical center). // The RIT clean room is closed this week.

Posted in NRG Tagged with: ,
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