Mechanical Engineering: Research Guide

Researchers at The University of Texas at Austin have teamed up with pharmaceutical company Eli Lilly and Company to uncover how storage conditions affect mRNA lipid nanoparticles (LNPs), the technology behind COVID-19 vaccines and other treatments, and how to make them more effective.

Honeycomb-shaped structures are familiar from beehives. Researchers have now designed molecules that self-assemble into a similar pattern on a scale far too small to see with the naked eye. These molecules are peptides: short chains of amino acids, the building blocks of proteins. Each peptide consists of only nine amino acids. Many identical copies assemble into tiny fibers with a honeycomb-like interior filled with water.

An international collaboration led by the University Medical Center Göttingen (UMG), Germany, has developed a labeling method that distinguishes fluorescent labels not by color but by how long it takes a dye to emit fluorescence. This makes it possible to visualize eight different proteins in a cell simultaneously in a single step using standard microscopes. The results have been published in the journal ACS Nano.

For the first time, researchers have directly imaged the magnetization dynamics inside a spin Hall nano-oscillator—a nanoscale device that converts direct current into tunable microwave signals and is a promising building block for energy-efficient wireless communication and brain-inspired computing.

Engineers at the University of Wisconsin–Madison have designed a new type of quantum nanostructure that could enable optical neural networks. This emerging technology has the potential to make artificial intelligence systems, like large language models and image generation, faster and significantly more energy efficient.

In their earliest years of development, computers used mechanical gears and levers to store information. Today, researchers are exploring whether a material itself can hold onto information, storing memory in how it bends and springs back to its original shape.

A drop of coffee on a tabletop often leaves a dark ring behind. This everyday mark is a reminder that a drying droplet is not passive: As water evaporates, it can transport the particles suspended inside it toward the edge. Scientists call this the coffee-ring effect. For inkjet printing and surface coatings, however, a ring is often exactly what engineers do not want. They need the material to land in a controlled, predictable pattern.

Seeing a bachelor's thesis published in a scientific journal is relatively uncommon. For three theses linked to the same research group to result in scientific publications within just three months is downright rare. Yet that is exactly what has happened in Elsebeth Schröder's research group at the Division of Quantum Device Physics.

Researchers have engineered a new material that is an extreme thermal insulator, is exceptionally stiff and can be printed as a thin film at large scales. The material has one of the lowest thermal conductivity profiles of any dense, or nonporous, material—approaching the theoretical limit of how good a material can be as a thermal insulator.

The humble coffee filter has the relatively simple job of letting the coffee through and leaving the grounds behind. But researchers from the ARC Center of Excellence for Carbon Science and Innovation (COE-CSI) are exploring whether a filter operating on the molecular scale can do something much more difficult: separate the caffeine from the coffee itself.

MXenes are two-dimensional nanomaterials first synthesized at Drexel University in 2011. They have been recognized by the International Union of Pure and Applied Chemistry as an emerging technology with "true potential to transform our world." But their widespread use has thus far been limited by the complicated process required to produce them.

Iron rusts on its own, slowly, over months or years. Now, researchers at Tohoku University have found a way to compress the process of metal reacting with water to form oxide, taking mere hours and using nothing more than ultrasound. Details were published in the journal Ultrasonics Sonochemistry.

KAIST's discovery of graphene oxide liquid crystals in 2011 laid the foundation for 15 years of research worldwide, leading to technologies for producing graphene fibers with high strength and thermal conductivity. The fundamental materials research that helped bring antibacterial toothbrushes and functional sportswear to market is now advancing into materials for thermal management.

Nanodiamonds are tiny diamond particles that usually measure mere millionths of a millimeter. They are extremely hard, stable and heat-resistant and highly adaptable for various purposes in medicine, new materials, catalysis and energy technology. By compressing plastic with lasers, researchers at the Helmholtz-Zentrum Dresden-Rossendorf (HZDR) and the University of Rostock are now able to systematically produce high-purity, ultra-small diamonds with a narrow size distribution. This is impossible to achieve with conventional methods such as explosions. As a scalable technology, laser compression offers great potential for improved, clean and sustainable production of ultra-small nanodiamonds..

Beauty and mystery—it is hard to imagine a more alluring combination, and this is precisely what we encounter when we observe phenomena in the nanoworld. But are we really sure that observations made using modern microscopic techniques do not influence what is happening there? A comparison of images of copper oxide nanoparticles reacting with chloroauric acid, obtained using electron and photon beams, has yielded unexpected results.

Physicists at Leipzig University and Charles University in Prague have developed a method for changing the swimming style of tiny artificial microswimmers in real time. They can make a single microscopic particle switch at will between modes of swimming inspired by bacteria and algae. The researchers have thus turned a property that was previously fixed during production into a programmable parameter. They believe their findings pave the way for an evolutionary approach to the development of synthetic active matter. Their study has now been published in Nature Communications.

Put a drop of water into a very hot pan, and it can skitter across the surface on a cushion of vapor. This is known as the Leidenfrost effect. Now, scientists have observed a related phenomenon involving ice and an extremely hot surface—on a length scale of billionths of a meter (nanometers) and within billionths of a second (nanoseconds).

Forty-four years ago, Nadrian Seeman published his groundbreaking ideas on using DNA as a structural material, expanding DNA's significance far beyond its role as a carrier of genetic information. Since then, the steadily growing field of DNA nanotechnology has seen numerous innovations. One was the DNA origami technique, which enables researchers to fold a single long strand of DNA into a desired 2D or 3D shape.

New research led by the ARC Center of Excellence for Transformative Meta-Optical Systems (TMOS) at the University of Melbourne demonstrates a new way to make invisible infrared light visible without relying on the expensive detector technology used in today's infrared cameras.

Very small biological samples and even individual biomolecules can now be examined under near-physiological conditions with high confidence at the BESSY II infrared beamline using a newly validated and improved technique: nanoscale infrared (IR) spectroscopy (s-SNOM) with ultrathin silicon-based membranes.

Helicobacter pylori bacteria infect around half the global population and are a leading cause of stomach ulcers and gastric cancer. While antibiotics remain the standard treatment, they often fail to reach bacteria hidden beneath the stomach's protective mucus layer and deep within ulcer tissue. This often requires higher antibiotic doses, increasing the risk of adverse effects and antibiotic resistance.

A single application of a "smart" self-repairing coating is being developed to dramatically extend rust protection for buildings, bridges, cars and other steel components.

The position of biomineralization peptides within liposomes can influence how gold nanoparticles grow, reports a research team from the Institute of Science Tokyo. Peptides localized at the membrane interface promote branched structures, while those confined to the liposome interior favor spherical nanoparticles. The findings offer a new strategy for controlling nanoscale reaction environments in nanoparticle synthesis.

A Sungkyunkwan University (SKKU) research team led by professors Taeyeon Kim and Doo-Hyun Ko of the Department of Chemistry recently published a comprehensive review titled "Carrier Dynamics in Nonfullerene Acceptor Organic Photovoltaics through Ultrafast Spectroscopy" in the journal ACS Nano.

Monash University-led researchers have directly imaged tiny swirling structures inside an atomically thin semiconductor, opening new possibilities for future low-energy electronic technologies. Published in Science Advances, the study reveals structures known as merons and antimerons, nanoscale "whirlpools" of electrical polarization, in twisted layers of the semiconductor tungsten diselenide (WSe₂).

A team of researchers from University of Toronto Engineering has created a new type of dye-sensitized nanoparticle that can detect target chemicals at very low concentrations while also distinguishing between molecules with very similar shapes.

Artificial intelligence is transforming how information is generated, processed and stored, but its rapid expansion is also driving unprecedented demand for computing power and electricity. Developing hardware that can process information more efficiently is therefore becoming one of the major technological challenges of the AI era.

Access to clean water depends not only on preventing pollution but also on being able to detect contaminants quickly and reliably. Among the pollutants of concern are metal ions such as mercury, lead and zinc, which can enter aquatic environments through industrial and other human activities.

Researchers at the Department of Energy's Oak Ridge National Laboratory (ORNL) have developed an artificial intelligence framework that helps researchers use atomic force microscopes to identify important nanoscale features while autonomously targeting the most informative areas of a sample for closer study.

"Color coatings are expected to provide vivid color, brightness, gloss and long-term durability, yet no existing technology satisfies all of these requirements simultaneously," says Kobe University materials engineer Hiroshi Sugimoto. Conventional coatings usually rely on relatively thick pigment layers that fade and add significant weight.