#pmma

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[materialsscienceandengineering]

Polymer beads generate electricity for self-charging devices using simple friction

An international team has discovered a simple and environmentally friendly way to power the next generation of self-charging electronics. The work is published in Nano Energy. How the technology works By making tiny plastic spheres move against each other, they generate electricity through friction. Instead of using complex fluoropolymer-based materials, the researchers created ultrathin, structured layers of polymethyl methacrylate (PMMA) spheres using a simple rubbing technique. Typically, producing such ultrathin films requires highly advanced equipment and is both costly and difficult. The result is thin films only a few micrometers thick—about 10 times thinner than a human hair—that can be inexpensively applied to any hard surface.

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[abstracteddistractions]

Felipe Pantone ‘s “Subtractive Variability Compact”,” 2022,

Subtractive Variability Compact combines the manipulable aspect with the operation of the CMY model in which endless shades of the chromatic spectrum are obtained from the subtraction of light that happens when the three colors are combined in their different variations. The construction of the subtractive color model allowed the standardization of printing around the world and was quickly adapted to industrial means of production. Each historical moment is accompanied by the visuality that allows its technological development, with CMY being the model that refers to a universe built from the notions of development, speed, connectivity, globalization and industrialization; a leitmotiv in Pantone’s work.

47 x 45 x 5 cm 18.5039" x 17.71653" x 1,9685",

UV paint, PMMA, pulleys

Courtesy: Configurable Art

[picard-schreckensberger]

Moment - kinetic sculpture

Celia-Hannes - Célia Picard & Hannes Schreckensberger

2015, fibreglass, pmma, pp

Rado Star Prize Austria, Vienna

[qingzinano]

How To Make Polymethylmethacrylate Nanofibers

In 2008, Weitz et al. found that polymethylmethacrylate (PMMA) nanofibers could be collected at the edge of the spin-coater and this could be regarded as a prototype system to produce nanofibers for other polymers (as shown in Fig. 10.1). In their experiment, 5 wt% PMMA solution in chlorobenzene was placed in the middle of the chuck of a spin-coater and the chuck was subsequently rotated at a speed of 3000 rpm for a few seconds. As shown in Fig. 10.1, the nanofibers were formed at the end of the polymer fingers, which can be explained by a Rayleighe Taylor instability at the aireliquid interface.

[materialsscienceandengineering]

Polymers join forces to deliver

An affordable, heavy metal- and odor-free method for making hollow polymer nanostructures has been designed by A*STAR researchers. These structures could find use as delivery systems for personal care products, drugs and agrochemicals.

The use of hollow polymer nanostructures for carrying—and preserving the stability of—active ingredients, such as salicylic acid, vitamins, drugs and pesticides, is booming. These shells release cargo on demand in response to triggers such as water. Current manufacturing methods are imperfect, due to either cost, environmental or safety reasons. Significant efforts are therefore being devoted to developing alternatives.

Alexander van Herk from the A*STAR Institute of Chemical and Engineering Sciences and Atsushi Goto from Nanyang Technological University, have designed a safe, simple route to synthesize polymer nanoparticles, nanocylinders and nanocapsules.

The first stage in this two-step synthesis is to polymerize methylacrylic acid (MAA) in the presence of iodine to make alkyl iodides. The poly(methacrylic acid) (PMAA) then acts as an initiator in the polymerization of methyl methacrylate (MMA) and formation of the block co-polymer. Sodium iodide is the catalyst in both stages. PMAA is hydrophilic and poly(methyl methacrylate) (PMMA) is hydrophobic, meaning that in polar solvents such as ethanol and water the co-polymer self-assembles into hollow nanostructures.

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[materialsscienceandengineering]

Scientists set record resolution for drawing at the one-nanometer length scale

An electron microscope-based lithography system for patterning materials at sizes as small as a single nanometer could be used to create and study materials with new properties

The ability to pattern materials at ever-smaller sizes -- using electron-beam lithography (EBL), in which an electron-sensitive material is exposed to a focused beam of electrons, as a primary method -- is driving advances in nanotechnology. When the feature size of materials is reduced from the macroscale to the nanoscale, individual atoms and molecules can be manipulated to dramatically alter material properties, such as color, chemical reactivity, electrical conductivity, and light interactions.

In the ongoing quest to pattern materials with ever-smaller feature sizes, scientists at the Center for Functional Nanomaterials (CFN) -- a U.S. Department of Energy (DOE) Office of Science User Facility at Brookhaven National Laboratory -- have recently set a new record. Performing EBL with a scanning transmission electron microscope (STEM), they have patterned thin films of the polymer poly(methyl methacrylate), or PMMA, with individual features as small as one nanometer (nm), and with a spacing between features of 11 nm, yielding an areal density of nearly one trillion features per square centimeter. These record achievements are published in the April 18 online edition of Nano Letters.

"Our goal at CFN is to study how the optical, electrical, thermal, and other properties of materials change as their feature sizes get smaller," said lead author Vitor Manfrinato, a research associate in CFN's electron microscopy group who began the project as a CFN user while completing his doctoral work at MIT. "Until now, patterning materials at a single nanometer has not been possible in a controllable and efficient way."

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[newstotalcomunicacao]

Resolução proíbe uso de PMMA por médicos em procedimentos na pele

Alergia, inchaço, dor intensa, manchas, deformação e perda de partes do corpo, queimaduras, sangramento, queloides, infecções, necrose e até morte. Estas foram algumas das sequelas graves do uso do polimetilmetacrilato (PMMA) apontadas nesta segunda-feira (1º) pelo Conselho Federal de Medicina (CFM) para justificar a proibição do uso médico deste material como substância em preenchimentos na…

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