A research team led by Associate Professor Yukihide Ishibashi at the Graduate School of Science and  Engineering, Ehime University, has successfully achieved the direct observation of exciton diffusion processes within individual copper phthalocyanine（CuPc）nanofibers using a custom-built femtosecond microspectroscopy technique, which enables clarification of exciton dynamics in mesoscopic materials. Previously, only ensemble-averaged information（e.g., CuPc thin films）was available for exciton diffusion coefficients and diffusion lengths. By measuring these parameters for single nanofibers, the team revealed that the diffusion coefficient of η-phase CuPc nanofibers is about three times higher than that of β-phase ones. This enhancement arises from the larger molecular tilt angle and stronger π–π overlap in the η-phase, which promote intermolecular excitonic interactions. Moreover, the diffusion coefficient was found to decrease with increasing fiber length, indicating a “size effect” in exciton hoopping. This study not only deepens the understanding of optical properties in organic molecular crystals but also provides important insights for improving the efficiency of organic photovoltaic and photoenergy-conversion devices. The findings were published online in The Journal of Physical Chemistry Letters by the American Chemical Society on October 31, 2025.

A team of scientists has developed a groundbreaking material that dramatically boosts the ability to extract uranium from seawater, addressing one of the key challenges in the sustainable development of nuclear energy. The study introduces a special type of covalent organic framework (COF) that shows record-high efficiency and selectivity in isolating uranium from the vast reservoirs hidden in the world's oceans.

Pairing cutting-edge chemistry with artificial intelligence, a multidisciplinary team of scientists today published fresh chemical evidence of Earth’s earliest life – concealed in 3.3-billion-year-old rocks – and molecular evidence that oxygen-producing photosynthesis was occurring over 800 million years earlier than previously documented.

Researchers at Rice University and Oak Ridge National Laboratory have unveiled a physics-based model of magnetic resonance relaxation that bridges molecular-scale dynamics with macroscopic magnetic resonance imaging (MRI) signals, promising new insight into how contrast agents interact with water molecules. This advancement paves the way for sharper medical imaging and safer diagnostics using MRI. The study was published in The Journal of Chemical Physics Nov. 12.

A $2.5 million grant from the federal Department of Energy EPSCoR program will enable University of Nebraska-Lincoln physicists to investigate the use of ferroelectric oxides in emergent quantum phases. It also will provide support for early career faculty, postdoctoral researchers, graduate and undergraduate students who will participate in the three-pronged research project.