[HN Gopher] CDs to flexible biosensors: Researchers discover ine...
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CDs to flexible biosensors: Researchers discover inexpensive
recycling method
Author : giuliomagnifico
Score : 46 points
Date : 2022-07-27 11:38 UTC (11 hours ago)
(HTM) web link (www.binghamton.edu)
(TXT) w3m dump (www.binghamton.edu)
| mikewarot wrote:
| Why not just buy gold leaf? It's about the same price, and you
| know what you're getting.
| rob74 wrote:
| AFAIK only (some) CD-Rs had a gold reflective layer, factory-
| pressed CDs use aluminum - so no gold, no silver. It's a bit
| strange that they started the whole project apparently without
| having a clue whether it would have actual practical value ("We
| used gold CDs, and we want to explore silver-based CDs, which I
| believe are more common.").
| awiesenhofer wrote:
| There are lots and lots of gold CDs out there. Sony, Verbatim,
| Kodak, etc all sold these "premium"/"gold"/"archival grade"
| versions. Even if its not billions like with aluminium, its
| definitly millions and a vast ressource to recycle. Sounds like
| a lot of practical value to me.
| ggm wrote:
| Most people (myself included) tend to think of a sensor as having
| some specific active measurement component. So a biologically
| available dissolved oxygen sensor (BOD) (for instance) has a semi
| permeable membrane, and an electrode, and measures the change in
| conductivity in the region due to dissolved oxygen changing the
| ability to pass volts through purified water. (ok, this was the
| 70s. I have no idea how they work now) The point is you pump
| volts across a gap, the membrane changes how they flow. Voila!
| dissolved oxygen changes the resistivity, you get to read how
| much dissolved oxygen was in the sample.
|
| But, the word is also applicable to a passive device if it can
| pick up a signal which can then represent a modulation of some
| other thing, through RF. The tip of a logic/IC probe, or a
| portable volt-amp meter in this instance is what they are calling
| the "sensor" when in fact, the sensor is the increadibly finely
| balenced coil and spring and magnet: the probe is just how the
| data comes in. (ok this is the 1890s. I have no idea how this
| works now)
|
| It's an antenna system. The Electrode gap, in my BOD example, but
| sans volts. You have to add the volts. Either it injects and
| reads, or its read-only. its the tip of the probe. Its got no
| active elements. How it "reads" depends on how you can convert
| something under measurement into a signal which it can pick up.
| The actual "sensor" component might be somewhere else. This is
| the transducer which you attach to something.
|
| I am guessing it can be used to make RFID antenna as well. That
| would be cool. Does anyone remember the sparkle gaps you got for
| the back of AMPS cellphones which lit up like a christmas tree
| when the 'wake up' signal was pumped into the phone?
|
| Actually nowadays, a dissolved oxy meter is probably best known
| as a fingerclip LED reader, and measures things by shining a red
| LED at your flesh to pick up on some aspect of the blood flow in
| a finger. I don't see any selectively permeable membrane there,
| its using another effect to measure. Passive probe? well.. you do
| shine an LED. so theres a transducer involved..
| boplicity wrote:
| Original paper:
|
| https://www.nature.com/articles/s41467-022-31338-9
| adolph wrote:
| Thanks, this is fascinating!
|
| _Verbatim archival gold CDs and the PI tape were purchased
| through Amazon for the UCDE fabrication illustrated in Fig. 1a
| and patterned with a Cricut Maker(r) fabric cutter._
|
| _The ECG MCU was designed with a uBIC-MZ24C20R (MEZOO, Inc,
| South Korea) chipset, which is a high-performance, low-powered
| one-chip 1 channel ECG (lead I) biometric sensor module with a
| 32-bit ARM Cortex-M0 processor. ECG data from two leads (RA and
| LA) were collected with 24-bit ADC resolution and 1 kHz
| sampling rate and then transmitted to a smartphone application
| in real-time via Bluetooth low-energy (BLE) communication._
| montecarl wrote:
| Figure 2 shows that the CD material is used kind of like
| electrodes or probes and those are attached to a
| microcontroller. This makes much more sense to me than the
| headline and main article.
| encryptluks2 wrote:
| Is that $1.50 per device from the conversion process or extra
| materials? I remember getting stacks of 50 CDs for like $5.
| mkmk wrote:
| The pictures are pretty but surely a bunch of metallic squiggles
| doesn't make a sensor....... right?
| ugjka wrote:
| > The flexible circuits then would be removed and stuck onto a
| person. With the help of a smartphone app, medical
| professionals or patients could get readings and track progress
| over time.
|
| 1) Draw a circle
|
| 2) Draw the rest of the owl
|
| /s
| adg001 wrote:
| Indeed the pictures are not representative of the real setup.
| Anyway the idea is clever. The paper provides an overview about
| most of the missing bits, such as the mcu, power source, and
| software.
| dathanb82 wrote:
| One of the applications is as an alternative electrode for
| ECG's. You'd attach a line from that sensor to an ECG machine
| (sorry, not an expert, so apologies for the imprecise
| terminology) and get similar results to using commercial
| electrodes.
|
| I dunno if that makes it a sensor, technically, or just one
| component in a more complex sensor apparatus.
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