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The origin of fast relaxation water in the terahertz frequency range have been elusive for years. In this contribution we have experimentally investigated the change in dynamical structure of water in salt solution using broadband dielectric relaxation spectroscopy (DRS) in the GHz to THz region to study the fast water. Numerical simulations have been conducted to quantify the dynamical properties...
The water relaxation dynamics is measured for DMPC vesicle solution and LMPC micelle solution from the dielectric spectroscopy. Both lipid have a same headgroup, which is interacting parts with the surrounding water molecules, but the change of the water relaxation time with increasing lipid concentration shows opposite trend. The result suggests that one needs to consider the lipid structure in water...
Intracelluar water is expected to have different physical properties from those of bulk water. Using polyethylene glycol, we induce model intracellular environment on DMPC lipid solution and we shows the accelerated movement of non-hydrogen bonding (NHB) water molecules interacting with DMPC in polyethylene glycol (PEG) solution from the dielectric response in the terahertz range. With the measurement...
Dynamics and structure of water network around nucleic acid have been subjects of intensive studies due to their contributions to biological process. Here, we identified spatiotemporal features of DNA hydration through examining fully-hydrated DNA solutions by THz spectroscopy. The results suggest the presence of weakly bound water beyond tight-binding hydration layer with the timescale of 11.6ps...
Frequency, geometry and dimensional dependences of the single-mode terahertz (THz) wave transmission along a dielectric bent fiber have been investigated. The human hair shaft, which resembles a dielectric rod and thus acts as a waveguide, is used for the transmission experiment. We here show the investigations based on a computational time-domain method in order to fully interpret the experimental...
High current density dispenser cathode is critical need for used in high power terahertz devices. Recently scandate cathode using nanoparticle offers very high current density more than 100 A/cm2. Fabrication of this kind of cathode is challenging issue due to its nano dimension of the particle size. One of the critical parameter is surface roughness of the emission surface. We develop dispenser cathode...
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