Shigeo Maruyama

A miniaturized pulsed supersonic beam source has been developed using laser vaporization of a computer-controlled target disk, producing intense beams of cluster ions with excellent repeatability and control. Due to its small size and narrow pulse width, the entire source is adequately pumped by a single 170 ℓ /s turbopump. The resultant vacuum quality permits this source to be attached to a Fourier transform ion cyclotron resonance apparatus (FT-ICR) such that the supersonic cluster ion beam is

Heat conduction of finite-length single-walled carbon nanotubes (SWNTs) was simulated by the molecular dynamics method with Tersoff-Brenner bond order potential. Temperature at each end of an SWNT was controlled by the phantom technique, and the thermal conductivity was calculated with Fourier’s law from the measured temperature gradient and the energy budgets in phantom molecules. The measured thermal conductivity did not converge to a finite value with increase in tube length up to 404 nm, but

Abstract Emerging solar cells, namely, organic solar cells and perovskite solar cells, are the thin‐film photovoltaics that have light to electricity conversion efficiencies close to that of silicon solar cells while possessing advantages in having additional functionalities, facile‐processability, and low fabrication cost. To maximize these advantages, the electrode components must be replaced by materials that are more flexible and cost‐effective. Researchers around the globe have been looking

Through molecular dynamics simulations, it was demonstrated that a thermal resistance cannot be neglected over a solid-liquid interface when a system size is very small, i.e. the relative importance of thermal resistance of heat conduction is small. A quasi-steady non-equilibrium heat-transfer simulation was performed with the molecular dynamics method. A vapor region was sandwiched between liquid layers, which were in contact with two solid walls. While independently controlling temperatures at

Recently, foldable electronics technology has become the focus of both academic and industrial research. The foldable device technology is distinct from flexible technology, as foldable devices have to withstand severe mechanical stresses such as those caused by an extremely small bending radius of 0.5 mm. To realize foldable devices, transparent conductors must exhibit outstanding mechanical resilience, for which they must be micrometer-thin, and the conducting material must be embedded into a

Heat transfer of single-walled carbon nanotubes (SWNTs) in practical situations is investigated using molecular dynamics (MD) simulations. Attenuation of the expected high thermal conductivity was simulated by mixing 13C isotope impurities to SWNTs or binding two SWNTs with different chirality with a junction structure in between. The heat transfer through the junction can be expressed with the thermal boundary conductance by considering a virtual boundary at the junction. The lateral heat condu