Measuring the force of a single synthetic small molecule

Previously, synthetic molecular machines have been used to perform mechanical tasks collectively, such as move liquid droplets uphill against the force of gravity, rotate microscale objects using liquid crystals doped with synthetic motor-molecules, and bend cantilevers. However, all these tasks are achieved by the collective action of billions and billions of molecular machines. Observing the mechanical behavior of an individual molecule is much more difficult. Synthetic molecular machines are often ten times smaller in each dimension than motor proteins and previously no one has managed to use single molecule techniques to look at how the components move in synthetic molecular machines. By using very sensitive atomic force microscopy experiments, researchers now were able to address the movement of the ring in individual rotaxane molecules.

Inkjet printing of single-crystal films

Researchers in Japan have developed a manufacturing technology for single-crystal thin films of organic semiconductors at arbitrary positions on the surface of sheets using a novel inkjet printing technique. The technology allows improving performance of thin-film transistors (TFTs), indispensable building blocks for large-area electronics products such as flat displays.

MXene – A new family of 2-D metal carbides and nitrides

An urgent challenge currently faced by researchers and the public alike is the ability to identify the next generation of sustainable, cost-effective, and energy efficient materials for our everyday use. While searching for new materials for electrical energy storage, a team of Drexel University materials scientists has discovered a new family of two-dimensional compounds proposed to have unique properties that may lead to groundbreaking advances in energy storage technology.

Researchers describe how to efficiently merge microdroplets using electric field

In microfluidic devices, small separated droplets flow in a stream of carrier liquid. Occasionally, selected droplets have to be merged to carry out a chemical reaction. This can be greatly facilitated with the use of electric field, through a process of electrocoalescence that has been used industrially in large scale applications. Researchers from the Institute of Physical Chemistry of the Polish Academy of Sciences have found the laws governing the process and how to maximise the efficiency of merging.

Free podcast: Questions about the safety of nanoparticles in food crops

With the curtain about to rise on a much-anticipated new era of "nanoagriculture" - using nanotechnology to boost the productivity of plants for food, fuel, and other uses - scientists are describing huge gaps in knowledge about the effects of nanoparticles on corn, tomatoes, rice and other food crops. That's the topic of the latest episode in the American Chemical Society's award-winning "Global Challenges/Chemistry Solutions" podcast series.