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18-member Nanoring Pushes The Boundaries of Global Aromaticity

Pushing the limits of size constraints in chemistry, an 8-nanometer 18-porphyrin nanoring (c-P18) becomes the largest known cyclic molecule to exhibit detectable global aromaticity. This phenomenon, where π-electrons are delocalized not just over individual aromatic units but around the entire macrocyclic ring, is mostly seen in smaller aromatic molecules but rarely found in macrocyclic entities.

Researchers from the University of Oxford and the University of Nottingham confirm that the c-P18 nanoring carries a circuit of 242 π-electrons, setting the current upper size limit for global aromaticity in butadiyne-linked systems. Using highly sensitive Fluorine-19 NMR spectroscopy, they tracked ring currents while charging the nanoring via oxidation.

The experiments uncovered faint magnetic shoulder signals—the telltale signature of electrons flowing globally between aromatic and antiaromatic states. This pushes beyond the benchmark set by the 12-member porphyrin nanoring, which had previously been the largest in this class, to show clear global aromaticity.

A scalable and accurate tool to characterize entanglement in quantum processors

Quantum computers, computing systems that process information leveraging quantum mechanical effects, could soon outperform classical computers in various optimization and computational tasks.

To enable their reliable operation in real-world settings, however, engineers and physicists should be able to precisely control and understand the quantum states underpinning the functioning of .

The research team led by Dapeng Yu at Shenzhen International Quantum Academy, Tongji University and other institutes in China recently introduced a new mathematical tool that could be used to characterize quantum states in quantum processors with greater accuracy.

World’s smallest marine dolphins can perform underwater barrel rolls

Scientists observing from boats knew little of the underwater behavior of the world’s smallest marine dolphin, the Hector’s dolphin.

Now, a paper has revealed a hidden world—including an array of acrobatics. The research is published in the journal Conservation Letters.

Barrel rolls, dives up to 120m deep, and upside-down feeding near the sea floor were behaviors discovered through tracking devices.

Compact phononic circuits guide sound at gigahertz frequencies for chip-scale devices

Phononic circuits are emerging devices that can manipulate sound waves (i.e., phonons) in ways that resemble how electronic circuits control the flow of electrons. Instead of relying on wires, transistors and other common electronic components, these circuits are based on waveguides, topological edge structures and other components that can guide phonons.

Phononic circuits are opening new possibilities for the development of high-speed communication systems, and various other technologies.

To be compatible with existing infrastructure, including current microwave communication systems, and to be used to develop highly performing quantum technologies, these circuits should ideally operate at gigahertz (GHz) frequencies. This essentially means that the sound waves they generate and manipulate oscillate billions of times per second.

Clever device drastically reduces the vibration from rotating parts

An EPFL Ph.D. student in mechanical engineering has developed a device that significantly dampens the flow-induced vibration caused by rotating parts, such as those in boat propellers, turbines and hydraulic pumps. His device can be produced with a 3D printer and has recently been patented.

It’s a classic case of beginner’s luck. Thomas Berger had just started his Ph.D. in at EPFL’s School of Engineering when he made his now-patented discovery, which is published in Scientific Reports.

His thesis built on work he had started as a master’s student, but with the help of a 3D printer. This led to the promising technology that’s now attracting interest from investors.

Direct grid connection technology provides fast charging solution for electric vehicles

With the surging popularity for electric vehicles (EVs), rapid charging is a challenge as it requires power delivery exceeding 1 MW (which can power about 1,000 homes). Conventional charging stations rely on bulky line frequency transformers (LFTs), which are expensive due to extensive use of copper and iron. These stations also have multiple conversion stages involving stepping up or down current, or converting AC to DC and vice versa. This can greatly increase cost and reduce efficiency.

To solve this problem, researchers at the Department of Electrical Engineering (EE), Indian Institute of Science (IISc), in collaboration with Delta Electronics India, have developed a novel cascaded H-bridge (CHB)-based multiport DC converter that directly connects to the medium-voltage AC (MVAC) . This eliminates the need for large and expensive LFTs.

Published in IEEE Transactions on Industrial Electronics, the study shows that such converters can help address the growing power demands of fast-charging EV stations, crucial for scaling up India’s EV infrastructure.

Researchers are first to image directional atomic vibrations

Researchers at the University of California, Irvine, together with international collaborators, have developed a new electron microscopy method that has enabled the first-ever imaging of vibrations, or phonons, in specific directions at the atomic scale.

In many crystallized materials, atoms vibrate differently along varying directions, a property known as vibrational anisotropy, which strongly influences their dielectric, thermal and even superconducting behavior. Gaining a deeper understanding of this anisotropy allows engineers to tailor materials for use in electronics, semiconductors, optics and quantum computing.

In a paper published in Nature, the UC Irvine-led team details the workings of its momentum-selective electron energy-loss spectroscopy technique and its power to unveil the fundamental lattice dynamics of functional materials.

‘Drop-printing’ shows potential for constructing bioelectronic interfaces that conform to complex surfaces

With the rapid development of wearable electronics, neurorehabilitation, and brain-machine interfaces in recent years, there has been an urgent need for methods to conformally wrap thin-film electronic devices onto biological tissues to enable precise acquisition and regulation of physiological signals.

Conventional methods typically rely on external pressure to force devices onto conformal contact. However, when applied to uneven three-dimensional surfaces such as skin, brain, or nerves, they generate significant internal stress which can easily damage fragile metal circuits and inorganic chips. This is an obstacle to the advancement of flexible electronics.

In a study published in Science, Prof. Song Yanlin’s team from the Institute of Chemistry of the Chinese Academy of Sciences, along with collaborators from Beijing Tiantan Hospital, Nanyang Technological University, and Tianjin University, propose a new film transfer strategy named as drop-printing, which has potential applications in bioelectronics, flexible displays, and micro-/nano-manufacturing.

Neutron detector mobilizes muons for nuclear, quantum material

In a collaboration showing the power of innovation and teamwork, physicists and engineers at the Department of Energy’s Oak Ridge National Laboratory developed a mobile muon detector that promises to enhance monitoring for spent nuclear fuel and help address a critical challenge for quantum computing.

Similar to neutrons, scientists use muons, fundamental subatomic particles that travel at nearly the speed of light, to allow scientists to peer deep inside matter at the atomic scale without damaging samples. However, unlike neutrons, which decay in about 10 minutes, muons decay within a couple of microseconds, posing challenges for using them to better understand the world around us.

The new detector achieves an important step toward ensuring the safety and accountability of nuclear materials and supports the development of advanced nuclear reactors that will help address the challenges of waste management. It also acts as a key step toward developing algorithms and methods to manage errors caused by cosmic radiation in qubits, the basic units of information in quantum computing. The development of the muon detector at ORNL reflects the lab’s strengths in discovery science enabled by multidisciplinary teams and powerful research tools to address national priorities.

Controlling electron interference in time with chirped laser pulses

In quantum mechanics, particles such as electrons act like waves and can even interfere with themselves—a striking and counterintuitive feature that defies our classical view of reality. We know this kind of interference happens in space, where different paths can overlap and combine, but what if we could take it further? What if we could control quantum interference in time, where electrons created at different moments interfere?

In a new study published in Physical Review Letters, a team of researchers developed a novel technique—chirped laser-assisted dynamic interference—to manipulate temporal during photoionization.

By using extreme-ultraviolet pulses with time-varying central frequency, in combination with intense infrared laser fields, they guided electron motion with unprecedented precision.

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