van der waals – Shamskm: A site to exchange knowledge and solutions

SOFS Take to Water

By Guest PostJanuary 5, 2014Science2d honeycomb, aka chemistry, berkeley lab, chemical signals, DNA, double helix, emergence of nanotechnology, force, metal organic frameworks, mofs, molecule, non covalent bonds, saxs, sofs, solubility in water, supramolecular chemistry, supramolecular organic frameworks, van der waals, xin zhao, yi liu, zhan ting li

Researchers at Berkeley Lab’s Molecular Foundry Create First Soluble 2D Supramolecular Organic Frameworks

Supramolecular chemistry, aka chemistry beyond the molecule, in which molecules and molecular complexes are held together by non-covalent bonds, is just beginning to come into its own with the emergence of nanotechnology. Metal-organic frameworks (MOFs) are commanding much of the attention because of their appetite for greenhouse gases, but a new player has joined the field – supramolecular organic frameworks (SOFs). Researchers with the U.S. Department of Energy (DOE)’s Lawrence Berkeley National Laboratory (Berkeley Lab) have unveiled the first two-dimensional SOFs that self-assemble in solution, an important breakthrough that holds implications for sensing and separation technologies, energy sciences, and, perhaps most importantly, biomimetics. (more…)

Researchers Solve Riddle of What Has Been Holding Two Unlikely Materials Together

By Guest PostMarch 23, 2013Sciencebi2te3, bismuth telluride, bonds, electricity, electronics, gaas, gallium arsenide, heat into electricity, houston dycus, james lebeau, jonathan pierce, molecules, north Carolina, rama venkatasubramanian, rti international, state university, super x, thin films, van der waals, weak electrical forces

For years, researchers have developed thin films of bismuth telluride (Bi2Te3) – which converts heat into electricity or electricity to cooling – on top of gallium arsenide (GaAs) to create cooling devices for electronics. But while they knew it could be done, it was not clear how – because the atomic structures of those unlikely pair of materials do not appear to be compatible. Now researchers from North Carolina State University and RTI International have solved the mystery, opening the door to new research in the field.

“We’ve used state-of-the-art technology to solve a mystery that has been around for years,” says Dr. James LeBeau, an assistant professor of materials science and engineering at NC State and co-author of a paper on the research. “And now that we know what is going on, we can pursue research to fine-tune the interface of these materials to develop more efficient mechanisms for converting electricity to cooling or heat into electricity. Ultimately, this could have applications in a wide range of electronic devices.” (more…)

A Material that Most Liquids Won’t Wet

By Guest PostJanuary 25, 2013Scienceair conditioners, air force, air repels, alcohols, anish tuteja, arun kota, blood, bounce off, breathable garments, carbon, chlorofluorocarbons, clays, custards, electric charge, electrospinning, fine particles, fluorine, interaction force, joseph mabry, liquid, liquid resisting, liquid solution, nanoscale coating, nanoscale cubes, non newtonian category, oils, organic acids, organic bases, oxygen, paints, pdms, polydimethylsiloxane, printer inks, refrigerators, rocket propulsion division, rubbery plastic particles, shampoos, shuaijun pan, silicon, solid, solid surface, solvents, stain resistant clothes, sulfuric acids, superomniphobic surface, surface tension, technique, toxic hydrochloric, university of michigan, van der waals, viscosity, waterproof paints

ANN ARBOR — A nanoscale coating that’s at least 95 percent air repels the broadest range of liquids of any material in its class, causing them to bounce off the treated surface, according to the University of Michigan engineering researchers who developed it.

In addition to super stain-resistant clothes, the coating could lead to breathable garments to protect soldiers and scientists from chemicals, and advanced waterproof paints that dramatically reduce drag on ships. (more…)

Going Big

By Guest PostJuly 23, 2012Scienceamanda wu, behavior of materials, carbon nanotube, China, chou research group, composite applications, fiber, force, go big, macroscale, nanoscale, sensor, strain, strain rate, tsinghua university, tsu wei chou, university of delaware, van der waals, weibang lu

UD researchers report progress in development of carbon nanotube-based continuous fibers

The Chou research group in the University of Delaware’s College of Engineering recently reported on advances in carbon nanotube-based continuous fibers with invited articles in Advanced Materials and Materials Today, two high impact scientific journals.

According to Tsu-Wei Chou, Pierre S. du Pont Chair of Engineering, who co-authored the articles with colleagues Weibang Lu and Amanda Wu, there has been a concerted scientific effort over the last decade to “go big” – to translate the superb physical and mechanical properties of nanoscale carbon nanotubes to the macroscale. (more…)

Opposites Attract

By Guest PostJuly 1, 2012Scienceenergy engineering, environmental, force, fuel cell membrane, hems, hems fuel cells, human hair, hydroxide exchange membranes, interaction, jason skovard, molecular interaction, nickel, non platinum metals, opposites attract, platinum catalysts, polymer chain, polymer membrane, polymer membranes, shuang gu, silver, udei, university of delaware, van der waals, yushan yan

UD professor reports milestone in fuel cell membrane research

It looks like a plastic candy wrapper that’s been charred on both sides, but it may hold the solution to commercially viable fuel cells.

About the thickness of a human hair, it is actually a thin polymer membrane sandwiched between two catalysts. The work is that of Yushan Yan, Distinguished Professor of Engineering at the University of Delaware, who is known for developing new catalysts and membranes to reduce the cost and improve the durability of fuel cells.

The membrane, he says, is a game changing development that shows great promise to revolutionize the way engineers and scientists think about traditional chemical crosslinking methods used to create strong fuel cell membranes. (more…)

Energy in Action

By Guest PostMay 16, 2012Scienceaction, ambre alexander, attraction, biomolecule, blind date, bulletproof body armor, crystallographic structure, dispersion method, dispersionless density functional, dldf, dutch physicist, energy, Europe, force, krzysztof szalewicz, molecule, motions of electrons, new method, nobel prize, physics, poland, polymorphs, rafal podeszwa, repulsion, thomson reuters, tracey bryant, tylenol, university of delaware, university of silesia, van der waals

For two molecules on blind date, new method predicts potential for attraction or repulsion

Krzysztof Szalewicz, professor of physics and astronomy at the University of Delaware, and Rafal Podeszwa of the University of Silesia Institute of Chemistry in Poland have developed and validated a more accurate method for predicting the interaction energy of large molecules, such as biomolecules used to develop new drugs.

The research is reported as a communication in the April 27 issue of the Journal of Chemical Physics, which is the most highly cited journal in atomic, molecular and chemical physics according to Thomson Reuters. The journal is published by the American Institute of Physics. Despite appearing at the end of April, the paper was on the list of the 20 most-read articles in JCP for that month. (more…)

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