Lifeboat Foundation: Safeguarding Humanity
Toggle light / dark theme

Blog

Category: nanotechnology

Sprinkling nanoparticles on spintronics

Today, I want to walk you through a deceptively simple innovation from the lab at Loughborough University (PI: Prof Marco Peccianti): what happens when we decorate a spintronic heterostructure with a sparse layer of plasmonic nanoparticles? This isn’t just a lab curiosity—it’s a step toward making terahertz sources more efficient, compact, and practical for real-world applications like high-speed communications, noninvasive imaging, and advanced spectroscopy.

Spintronic terahertz emitters rely on a thin, multilayer stack—typically heavy metal like tungsten (W), a ferromagnetic layer such as iron (Fe), and a platinum (Pt) cap. A femtosecond laser pulse strikes the structure, rapidly heating electrons and generating a pure spin current through spin-orbit torque effects.

This spin current converts into broadband terahertz radiation at the interfaces, bypassing the need for cumbersome phase-matching crystals used in traditional optical rectification. It’s elegant and scalable, but most laser light reflects off or transmits through without effectively coupling to the magnetic layer, limiting spin injection and THz output power.

A hidden property of light could power future nanomachines

Light does more than illuminate the world—it can also push and twist matter. It was back in the 1870s that James Clerk Maxwell first predicted that light carries momentum and can exert pressure on objects. Nearly a century later, in the 1970s, Arthur Ashkin asked why not use this property of light to hold and push around tiny particles. He developed optical tweezers that use focused laser beams to trap and move nanoscale objects.

While scientists have long known that light can exert small forces, detecting them has been extremely difficult. Objects at this scale are constantly jostled by random thermal motion, making the subtle influence of light hard to measure.

Generalized optical meta-spanners empower arbitrary light paths for multitasking optical manipulation

Have you ever wished to drive microscopic matter along an arbitrarily tailored trajectory instead of just a circle? That’s exactly what we set out to achieve.

The field of photonic force manipulation has opened new avenues for controlling the microscopic world with light. Since the invention of optical tweezers in 1986, the non-contact trapping and manipulation of microscopic particles using the momentum and angular momentum of light has become an indispensable tool in biophysics, soft matter science, and micro-nanotechnology—a contribution recognized by the 2018 Nobel Prize in Physics.

Conventional optical tweezers rely on the intensity gradient of a Gaussian beam to generate a three-dimensional restoring potential for stable particle trapping.

How nanomedicine gets inside your cells and treats you from the inside out

Canadians swallow millions of pills every day to treat common health issues like high blood pressure, high cholesterol and Type II diabetes, but scientists are working at the molecular level to turn patients’ cells into pharmacies.

Nanotechnology, where atoms and molecules are manipulated on a tiny scale—a billion times smaller than a meter—is already incorporated into everyday products like sunscreen, waterproof clothing and smartphones.

In nanomedicine, it’s being used to prompt RNA to make protein-based drugs to treat diseases. Now we can fine-tune protein production by dialing it up or down, creating personalized medicine on an invisible scale.

Graphene as a charge mirror: Why water droplets ‘see’ graphene—but don’t show it

Research on graphene has made great strides in recent years. However, to fully harness its potential in applications such as desalination membranes, sensors, and energy storage and conversion, a deeper understanding of the interaction between graphene and water is required.

Until now, it was widely thought that graphene, when supported on a substrate, largely inherits the wetting properties of the underlying material, a phenomenon known as “wetting transparency.” An international research team led by Yongkang Wang and Yair Litman has now shown that, while graphene appears transparent on large scales, it exerts a subtle but significant influence on nearby water molecules at the nanoscale. The study is published in the journal Chem.

Graphene, a carbon layer just one atom thick, is considered a wonder material: extremely stable, highly conductive, and optically transparent. For a long time, it appeared just as transparent to water: measurements of the water contact angle—a measure of wettability—showed that graphene on a substrate lets through the substrates wettability virtually unchanged. This phenomenon of wetting transparency, observed for years, seemed to contradict the fact that graphene is highly polarizable and therefore reacts sensitively to charges in the substrate.

Unlocking unusual superconductivity in a lightweight element

Superconductors—materials that can conduct electricity without energy loss—are crucial for next-generation high-efficiency, ultrafast electronics. However, most superconductors share a critical limitation: they lose their superconducting properties in strong magnetic fields. In contrast, a class of superconductors containing heavy elements can sustain an unusual type of superconductivity in magnetic fields beyond the conventional limit. Now, new research has demonstrated that this limitation can be overcome by sandwiching atomically thin films of a lightweight element called gallium between two other materials to engineer quantum interactions at the interfaces between the layers.

A paper describing the research, led by an interdisciplinary team at Penn State’s Materials Research Science and Engineering Center (MRSEC) for Nanoscale Science, was published in the journal Nature Materials. The team showed that when just three atomic layers of gallium are layered between graphene and a silicon carbide substrate, the resulting structure maintains superconductivity in magnetic fields that are parallel to the surface of the material, or in-plane, well above the expected limit.

“This discovery highlights the strength of collaborative, cross-disciplinary research fostered by the Penn State MRSEC,” said Cui-Zu Chang, professor of physics at Penn State Eberly College of Science and leader of the research team. “By bringing together expertise in materials synthesis, quantum transport and theoretical modeling, we were able to uncover a phenomenon that would have been difficult to realize within a single research group.”

Record-breaking photonics approach traps light on a chip for millions of cycles

For years, scientists have dreamed of using atomically thin van der Waals (vdW) materials to build faster, more efficient photonic chips. These materials can be stacked and tuned with extraordinary precision, opening possibilities far beyond those of conventional technologies. The challenge is that they are extremely fragile, making them notoriously difficult to shape with standard nanofabrication tools.

Now, an international team of researchers including scientists from Aalto University has overcome this long-standing barrier. By developing a method for what can be described as nanoscale surgery, they were able to sculpt these delicate materials without destroying them, achieving record-breaking performance in the process.

Published in Nature Materials, the work marks an important step forward for vdW materials, shifting them from passive coatings toward becoming the active building blocks of future photonic and quantum devices.

Scientists Discover Dual Treatment for Lung Cancer and Muscle Wasting

Researchers at Oregon State University have pioneered a transformative approach for simultaneously targeting lung cancer and the debilitating muscle-wasting syndrome known as cachexia—a condition that plagues many lung cancer patients. Their groundbreaking work employs lipid nanoparticles (LNPs) as a delivery vehicle for messenger RNA (mRNA) therapeutics, addressing critical challenges in precision drug delivery for aggressive tumors deep within the lung tissue.

Lipid nanoparticles, microscopic carriers composed of fatty compounds like lipids, have revolutionized drug delivery with their ability to ferry genetic material directly into cells. In this study, the OSU team engineered LNPs comprised of DC-cholesterol and a specialized ionizable lipid, 113-O12B, which exhibited a remarkable ability to bind a blood serum protein called vitronectin. This binding triggers the formation of a protein corona on the nanoparticles, a dynamic interface that actively guides the LNPs to lung tissue, and more importantly, lung tumor microenvironments.

Vitronectin’s recruitment is no coincidence. It interacts with integrin receptors—cellular docking proteins highly expressed on lung cancer cells. These integrins act as biological gateways, facilitating enhanced uptake of the therapeutic nanoparticles by tumor cells while sparing healthy tissue. This receptor-mediated targeting marks a significant advance over conventional LNPs, which commonly accumulate in the liver, limiting their therapeutic index against lung malignancies.

/* */