Rubberized Origami
Neat off-the-wall idea from Instructables user blightdesign, who’s been experimenting with preserving folded paper by rubberizing it with Plasti-Dip. More pics in B. Light Design’s Flickr set.
Chemistry
Using Liquid Paint Stripper as Acrylic Cement
Unless your application is critical, cheap liquid paint stripper from the hardware store (not the gel, paste, or color-changing varieties) is a fine substitute for commercial acrylic solvent cement. Comparing one MSDS to another, we see that each product is about 75 wt% dichloromethane (AKA methylene chloride), which is the “active ingredient” that softens the plastic and allows it to weld. Purpose-made acrylic solvent is a bit thinner, in my experience, and evaporates a little faster, and contains trace amounts of acrylic monomer that may result in a slightly stronger bond, but for most practical purposes I have not found these qualities to justify paying twice as much for it.
Identifying Unknown Plastics
This is a piece of free-burning ABS tubing showing characteristic flame color and smoke. The burn test, as it’s known, correlates a plastic sample’s composition with a set of observable properties including…
Fire Without Matches: Twenty-Three Spontaneously-Igniting Reactions
Really wonderful community video collaboration from the chem-hackers of sciencemadness.org, including MAKE pal and guest blogger Hayden Parker. Over about fourteen minutes, we are treated to a bench-side view of two dozen energetic reactions that share an interesting property: reagents that, on mixing, spontaneously burst into flame.
How-To: Clear Glass Circuit Boards
Interesting homebrew process from Charles Lohr, who demonstrates it here with a multicolor-LED-controlling capacitive touch sensor that works from the reverse side of the glass, i.e. you can use it without actually touching the copper. No holes are drilled in the glass, so all components have to be SMT. Cool stuff.
Introducing Plastics Month
The very word means capable of being shaped, molded. Plastic is a cheap, durable, plentiful, extremely adaptable, and variable material that can be put to seemingly endless uses, from furnishings, building materials, and machine parts, to tools, weapons, vehicles, to now just about anything that can be extruded from a 3D printing head. The downside of its cheapness and ubiquity (not to mention the polluting nature of its manufacture) is that it leads to a profusion of waste material.
What Supercritical Carbon Dioxide Looks Like
At extremes of temperature and pressure above a substance’s so-called “critical point,” the distinction between liquid and gas phases of that substance stops being meaningful, and the substance enters a homogeneous “supercritical” phase. For many substances, supercritical temperatures and pressures are difficult to achieve, and that’s doubly true if you’re hoping to achieve them under conditions that still allow for visual observation.
