Showing Spotlights 33 - 40 of 184 in category All (newest first):
Plasmonic 'nanotweezers' are structures made of noble metals that concentrate and absorb light, resulting in 'plasmonic hotspots' that make it possible to manipulate nanoscale objects suspended in a fluid. Trapping or sensing of nanoparticles using nanotweezers suffers from an intrinsic problem of low throughput as the particle delivery process is often diffusion-limited. Researhers have developed bubble- and convection-assisted trapping techniques that overcome the diffusion-limited trapping in nanoaperture tweezers and enable a reduction of 1-2 orders of magnitude in particle-trapping time compared to that of a diffusion-limited trap.
Dec 23rd, 2019
Nanoengineering is a branch of engineering that exploits the unique properties of nanomaterials - their size and quantum effects - and the interaction between these materials, in order to design and manufacture novel structures and devices that possess entirely new functionality and capabilities, which are not obtainable by macroscale engineering. The book 'Nanoengineering: The Skills and Tools Making Technology Invisible' puts a spotlight on some of the scientists who are pushing the boundaries of technology and it gives examples of their work and how they are advancing knowledge one little step at a time.
Dec 4th, 2019
Scientists found that size-confinement - going from macroscopic bulk samples towards nanoparticles - leads to drastic changes in the atomic structure of certain magnetocaloric materials: The change from positive thermal expansion at the macroscale towards a negative thermal expansion (NTE) at the nanoscale. NTE materials are of increasing technological interest mostly because of the idea of mixing them with a symmetric negative thermal expansion material in order to create a composite material which has near-zero thermal expansion. The nanoparticle shape is particularly suitable for the design of such composites.
Oct 10th, 2019
2019 marks the 150th anniversary of the Periodic Table, a unique tool, enabling scientist to predict the appearance and properties of matter on the Earth and in the the Universe. Different elements have played critical roles in different periods of human activities, with silicon (Si) being a key element, at present. However, the nanotechnology age has brought different elements into the limelight and transformed their roles in science and technology. A recent article discusses the most relevant elements from a nanotechnology perspective and their applications in nanomaterials.
Oct 9th, 2019
The precise mechanisms underlying friction at the nanoscale are still not completely understood. While gears, bearings, and liquid lubricants can reduce friction in the macroscopic world, the origins of micro-and nanoscale friction for small devices require other solutions. This primer explains the concept of friction, in nature and man-made systems, especially at the nanoscale. It then discusses a new class of 'smart' materials with the ability to modulate the friction of a surface.
Aug 29th, 2019
Nanoparticle characterization is a broad and complex discipline. Even today, researchers are still challenged by the task of determining the physicochemical properties of nanoparticles and exploring their structure-function relationships. A recent review article provides a set of guidelines to investigate and characterize the key parameters defining a nanoparticle sample, namely size, shape, surface charge, and porosity. It also provides recommendations of how the physicochemical parameters of nanoparticles should be investigated, and how to characterize these key properties in different environments according to the intended nanoparticle use.
Jun 5th, 2019
Superlubricity is a phenomenon where two surfaces slide over each other with barely any resistance (a state that is called near-zero friction). This is a very special case where friction almost vanishes between two surfaces. The difficulty of achieving superlubricity in mechanical systems is due to the very complex physical, chemical, and mechanical interactions that occur simultaneously at the sliding interfaces of these systems. Superlubricity is one of the most promising properties of functional nanomaterials for energy saving applications.
May 10th, 2019
Whereas the evolutionary path of the atomic world has occurred over billions of years, the evolutionary path of the synthetic nanoparticle world has just begun. Man-made nanoparticle assemblies are beginning to revolutionize different fields including thermoelectronics, photoelectronics, catalysts, energy generation and storage, as well as medical diagnostics and therapeutics. Using the unconventional approach of comparing the atomic and nanoparticle worlds authors describe the development of nanoparticle research during the past several decades and provide pointers as to what the future might hold.
Jan 22nd, 2019