Researchers from City University of Hong Kong, Ariel University in Israel and Dalian University of Technology in China have made a new discovery about droplet behaviour that could enable novel surfaces with anti-icing capabilities for a range of applications. They found that it is possible to shape the droplet to bounce from the surface in a pancake shape directly at the end of the spreading stage without going through the receding process. As a result, the droplet can be shed away much faster.
The team experimentally demonstrated that the drop bouncing is intricately influenced by the surface morphology. ‘Under the same centre-to-centre post spacing, surfaces with a larger apex angle can give rise to more pancake bouncing, which is characterized by a significant contact time reduction, smaller critical Weber number, and a wider Weber number range,’ according to co-authors Gene Whyman and Edward Bormashenko, both professors at Ariel University.
The video shows a droplet bouncing on structured surfaces of different topography. On the left, a droplet bounces in pancake shape on tapered posts with a significant time reduction. On the right, conventional bouncing on straight posts. Credit: Z.Wang/HKU
“The dome shape chapel, was constructed of a steel arch frame and lattice of Japanese cypress. The original “power of flowers” lattice pattern was rendered with the roots, trunk, and leaf apex of a single tree, to fittingly express the heritage of ancestors as well as hopes for the future for the wedding ceremonies held in the chapel. As if the chapel were enveloped by forest, the shadows fall on the floor formed by the sunlight filtering into the dome.” (via Nikken Space Design)
3D-printing has something to tell also in Medicine. This case is particularly impressive due to the short age of the baby, and because we’re speaking about none other than a “whole brain shrinking plastic surgery”… Oh, and also because the money was raised thanks to a collect in the Internet. A touching history, certainly.
Yesterday we saw how graphene can be used as a lubricant to make friction disappear. Today scientists reveal that the two-dimensional sheets of linked carbon atoms can be fashioned into hinges and springs to build microscale machines.
cornelluniversity researchers made the tiny devices using principles from kirigami, the ancient art of cutting and folding paper. Melina Blees and her colleagues decided to try the approach after early studies poking graphene sheets showed that the material behaves physically much like paper–it folds and crumples outside of the sheet’s plane but doesn’t stretch or compress within the plane. Learn more and see photos and video below.
(A large sheet of graphene can be crumpled like soft paper and returns to its original shape in a water and soap solution.)
Solo nombraré las cosas y en los videos que haré hablaré más al respecto de todo.
En la primera foto de pueden ver la mayoria de las cosas que tengo, en la segunda se aprecian todos los marcadores:
3ra foto: marcadores promarker.
4ta foto: marcadores copic ciao.
5ta foto: lapices sharpie.
6ta foto: marcadores alcohol alotek (marca de lapiz lopez)
7ma foto: Marcadores jumbo artel, lapices marcadores colores especificos giotto y pegamento con brillos giotto.
8va foto: portaminas milan 0.7, lapiz gel blanco marca pilot, portaminas pentel 0.7, portaminas staedtler 0.3, portaminas faber castell 0.5, minas staedtler 0.3 y 0.5, goma de borrar staedtler, gomas de borrar en lapiz marca pentel, repuesto de gomas pentel, tiralineas 0.2, 0.3 y 0.5 marca Artel, tiralineas 0.5 uni, lapices caligraficos artline.
9na foto: Acuarelas en tubos marca Pebeo, acuarelas marca alotek (las negras) acuarelas staedtler.
y Además en la primera foto se pueden ver las croqueras uso normales, doblefaz y chicas normales marca torre :)
Have you ever wished you could hide under an invisibility cloak like Harry Potter or conceal your car with a Klingon cloaking device like in Star Trek? In a special bonus episode of Reactions, we celebrate the International Year of Light by exploring the science behind light, sight and invisibility. Though we can’t make ourselves invisible yet, some promising research may light the way – or rather, bend the light away.
A Marine Critter that Shines Like a Gem Could Make Better Coatings and Displays
This tiny marine animal called a sea sapphire shimmers and glows brilliantly without a single drop of drop of pigment. Instead, the crustacean uses crystals of guanine, the same organic molecule that makes up one of the nucleotides in DNA and RNA.
Chemist Lia Addadi and her colleagues in Israel found that hexagonal guanine crystals are responsible for reflecting light at certain angles. These same crystals, obtained from fish scales, have been used for centuries to create pearly iridescence in cosmetics, shampoos and paints.
“One of the most striking examples of such photonic structures are the male sapphirinid copepods, small marine crustaceans that produce a variety of different colors, but only when the incident light is at specific angles to the animal’s dorsal surface,” the authors write in a study published in the Journal of the American Chemical Society. “Thus, the copepods ‘flash’ light of a specific color, but as they move they become transparent and suddenly seem to almost completely disappear.” Learn more and see images below.