Commit b137fc05 authored by Filippos Tourlomousis's avatar Filippos Tourlomousis

continue documenting

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<h1 class="text-sm-center">FAB-ES</h1>
<h3 class="text-sm-center">Fabricatable (E)lectro(S)pinning Machines</h3>
<h4 class="text-sm-center">for</h4>
<h4 class="text-sm-center">DIY Filter Production</h4>
<h4 class="text-sm-center">DIY Filter Media Production</h4>
<br><br>
<h5 class="text-sm-center">by Filippos Tourlomousis, Jiri Zemanek and Zach Fredin</h5>
<h5 class='text-sm-center'>The Center for Bits and Atoms, MIT</h5>
<hr>
<h2>A. Filters: Design Specs</h2>
<br>
<p class="lead text-justify">
......@@ -81,11 +81,13 @@
<h2>B. Process: Electrospinning</h2>
<br>
<p class = "lead text-justify">
The Electrospinning process is based on the electrohydrodynamics phenomenon, where a material substrate loaded within a syringe
with a charged needle tip attached pointing towards a grounded collector is extruded and subsequenlly stretched using a high volatage potential.
Assuming that the material substrate is viscoelastic enoough and as soon as the electrostatic stresses overcome the surface tension
of the material, fibers in a chaotic motion are deposited on teh collector. The fiber formation mechanism is shown in the video below:
<p class="lead text-justify">
The Electrospinning process is based on the electrohydrodynamics phenomenon, where a material
substrate loaded within a syringe with a charged needle tip attached to it and pointing towards
a grounded collector, is extruded and subsequenlly stretched using a high volatage potential.
Assuming that the material substrate is viscoelastic enoough and as soon as the electrostatic stresses
overcome the surface tension of the material, fibers in a chaotic motion are deposited on the collector.
The fiber formation mechanism is shown in the video below:
</p>
<br>
......@@ -95,32 +97,53 @@
<br>
<p class="lead text-justify">
The two main types of electrospinning process are: a) solution electrospinning and b) melt electropsinning.
This classification is based on the material form used for processing with SES using polymer solution (pellets/powder
mixed with solvent) and MES using pure polymer melt without any chemical solvents. THe 3 main common components
for both processes are: a) extrusion device that can be either mechanical using a syringe pump or pneumatic,
b) a high-voltage power supply and c) a collector that in the most basic setup is a flat grounded aluminum plate.
The two main types of electrospinning process are: a) solution electrospinning (SES) and b) melt
electrospinning (MES). This classification is based on the material form used for processing; with SES using
a polymer solution (pellets/powder mixed with solvent) and MES using pure polymer melt without any chemical solvents.
The 3 main common system components for both process types are: a) the extrusion device that can be either
mechanical using a syringe pump or pneumatic, b) a high-voltage power supply and c) a collector that in
the most basic setup is a flat grounded aluminum plate.
</p>
<br>
<img src="img/ses-vs-mes.PNG" class="rounded mx-auto d-block" width="80%">
<br>
<p class="lead text-justify">
Different types of nozzles and collectors assembled either in a horizontal or vertical configuarations have been
reported in the literature leading to different types of electrospinning processes. Each electrospinning process
has advantages and disadvantages depending on the application.
</p>
<hr>
<h2>C. What is the best type of electrospinning process for rapid diy breathing filter media production?
</h2>
<p class="lead text-justify">
D0ifferent types of extrusion, nozzles and collectors assembled either in horizontal or vertical configuarations have been
reported in the literature leading to different types of electrospinning processes. Each electrospinning process has advantages
and disadvantages depending on the application.
- high-throughput<br>
- multiple nozzles<br>
- rolling collector<br>
- polymer solution for functionalization<br>
- hydrophobicity<br>
- anti-viral material<br>
- fast cheap assembly<br>
</p>
<hr>
<p class="lead text-justify">
Below in Section "D" we propose 3 different types of electrospinning machines of varying complexity and capabilities staring
from the simplest one that can be made with off-the0shelf components that might be laying around in a hospital, moving to a
simple design that reducing the cost, is parallelizable and can be made in a fab lab using a laser cutter and a 3D printer and
resulting to a slightly more advanced for increaed throughput.
</p>
<h2>C. FAB-ES Machine Collection</h2>
<hr>
<h2>D. FAB-ES Machine Collection</h2>
<p class="lead text-justify">
Designs with increasing complexity/capabilities
</p>
<br>
<h2 class="text-sm-center" id="fabes1">FAB-ES Machine #1</h2>
<h4 class="text-sm-center" id="fabes1">The simplest ES machine made using mostly off-the-shelf parts found in a hospital</h4>
<h4 class="text-sm-center" id="fabes1">The simplest ES machine made using mostly off-the-shelf parts
found in a hospital</h4>
<p class="lead text-justify">
<b><u>Parts:</u></b>
......@@ -149,7 +172,7 @@
<li>Aligator Clips</li>
<li>Electrical Tape</li>
</p>
<br>
<img src="img/img-es-meshes.PNG" class="rounded mx-auto d-block" width="80%">
......@@ -159,6 +182,16 @@
<h2 class="text-sm-center" id="fabes1">FAB-ES Machine #2</h2>
<h4 class="text-sm-center" id="fabes1">The simplest fabricatable ES machine design</h4>
<hr>
<h2 class="text-sm-center" id="fabes1">FAB-ES Machine #3</h2>
<h4 class="text-sm-center" id="fabes1">Roll-to-Roll Multinozzle Solution Electrospinning</h4>
<hr>
<h2 class="text-sm-center" id="fabes1">FAB-ES Machine #3</h2>
<h4 class="text-sm-center" id="fabes1">Roll-to-Roll Blowing Electrospinning</h4>
</div>
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