Materials Literature
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Metal-organic frameworks (MOFs) represent a new class of hybrid organic-inorganic supramolecular materials comprised of ordered networks formed from organic electron donor linkers and metal cations. They can exhibit extremely high surface areas, as well as tunable pore size and functionality, and can act as hosts for…
加速器施設や高高度での飛行においてGeVオーダーに及ぶエネルギーの高い放射線に被ばくする機会が増えてきた。そうした粒子による被ばくが生体に与える影響には大きな不確かさがあり、更なる知見の集積が必要である。高エネルギーの輸送をモデル計算だけで正確に予測することは難しく、信頼性の高い線量評価の為に実測による検証は不可欠である。その検証には広いエネルギー範囲にわたる応答特性の明らかな測定装置が必要だが、GeVオーダーに及ぶ広いエネルギー範囲の粒子を網羅的に照射できる照射場は見当たらない。そこで、我々は、日本で最も標高の高い富士山の山頂（高度3,776m; N 35.36°, E138.73°）にある施設を利用して放射線測定装置の特性評価…
中性子捕獲療法(BNCT)が奏功するには、硼素化合物(boronophenylalanine(BPA)等)の腫瘍への取込が高く、正常組織への取込が低いことが求められる。したがってBNCT適応患者の選択には、硼素化合物の腫瘍と正常組織への取込を事前に推定することが重要で、このような目的にはPET診断が有用だと考えられる。現在、18F-BPA-PETが使用可能であるが、18F-BPAの合成は容易でなく、広く臨床で使用されるには至っておらず、汎用性の高いPETトレーサーの選択が求められている。本研究では、BPAの取込を評価できるPETトレーサーの探索に向けた基礎検討を行った。[方法] 3H-BPA 、BPAと同じトランスポーターで取り込…
The title compound, [Fe(C(2)H(5)O)(C(36)H(44)N(4))], contains a five-coordinate iron-porphyrin complex with an axial eth-oxy ligand. The iron(III) atom is displaced by 0.504 (2) Å towards the eth-oxy ligand from the 24-atom mean plane of the porphyrin. The average Fe-N(p) distance is 2.078 (2) Å and the Fe-O distance…
Arc-discharged single-walled carbon nanotubes were oxidized by ammonium persulfate, which led carboxyl to the surface of the tubes. The oxidized single-walled carbon nanotubes were further modified with ammonium sulfamate through a condensation reaction taken place between the carboxyl on tubes and the amido of ammoni…
Ti–Zr–Ni icosahedral quasicrystal powders (Ti-QC), prepared by mechanical alloying and then annealing in a vacuum furnace, were used as a novel filler material in polyamide 12 (PA12). The melt processability of the composite was studied using a Haake torque rheometer. This indicates that PA12/Ti-QC composites can be m…
Gold (Au) nanoparticles have been synthesized that are stabilized by an organic ligand bearing a dithiolane functional group for binding to Au, an oligo(p-phenylene vinylene) (OPV) chromophoric group to drive self-assembly via π-π interactions, and a hydroxy functionality for interparticle hydrogen bonding. The OPV-Au…
The present study is aimed to characterize the possible chemical interaction between CuI and SWCNTs in CuI@SWCNT and electronic structure of the latter with X-ray absorption spectroscopy. Comparative analysis of C1s and Cu2p absorption spectra for CuI@SWCNT and reference samples in the framework of the quasi-molecular…
Abstract Layered silicate nanocomposites based on polyamide 6 and polypropylene have been prepared via static annealing experiments. The evolution of clay dispersion into the polymer matrices was monitored by wide angle X‐ray diffraction analysis and transmission electron microscopy. The results have evidenced that th…
Abstract Modulation of color change and photocyclization of diarylethene with metal complex is described. A diarylethene derivative with 4‐(ethylideneamino) phenol group 1a is prepared and photochromic behavior is investigated. It is found that 1a exhibits ring‐opening and ring‐closing photoisomerization with UV/Vis l…
Sorption of Ag, Cu, Pb, Cd, Fe and Mg cations on multi-walled carbon nanotubes (MWCNTs) produced by CVD method has been investigated in static and dynamic modes. Correlation between synthesis temperature of MWCNTs and their sorption capacity has been demonstrated. It was shown that concentration of carbonyl groups on…
A facile “click chemistry” approach to functionalize 2D macromolecules of graphene oxide nanosheets with poly (ethylene glycol) of different molecular weights, polystyrene, palmitic acid and various amino acids was presented. FTIR, TGA, Raman spectroscopy, XPS, XRD, TEM, AFM and SEM were utilized to characterize the p…
Transparent coatings consisting of a Y 2 O 3 :Eu 3+ ,Bi 3+ layer (bottom) and a porous SiO 2 layer (top) with high and low refractive index, respectively, were fabricated on quartz glass substrates by a sol–gel dip‐coating method. The thickness of both the layers and the refractive index of the SiO 2 layer were design…
X-ray absorption near-edge structure (XANES) spectroscopy has been used for comparative investigation of the electronic structure of pristine and fluorinated single-walled carbon nanotubes (SWCNTs) before and after annealing. The SWCNTs were produced by catalytic chemical vapor deposition method and fluorinated using…
We investigate fluorescence blinking of individual RC-LH1 (reaction-centre-light-harvesting 1) complexes from the photosynthetic purple bacterium Rhodopseudomonas palustris. For both the on- and off-periods the telegraph-like intermittency of the fluorescence intensity follows power-law statistics with exponents betwe…
-isopropyl acrylamide) (pNIPAM) undergoes a sharp property change in response to a moderate thermal stimulus at physiological temperatures. In this work, we constructed a radio frequency (RF) plasma reactor for the plasma polymerization of pNIPAM. RF deposition is a method that coats surfaces of any geometry producing…
Abstract Polycarbosilanes were synthesized by hydrosilylation reaction of A2 monomer containing bis SiH moieties and Bn (n = 2, 3, and 4) monomers containing di‐, tri‐, and tetra‐vinyl groups in the presence of Karstedt's catalyst. The corresponding linear polycarbosilanes (LPC) and hyperbranched polycarbosilanes (HB…
Fracture mechanics at the nanoscale level is a very complex phenomenon, whereas the macroscale fracture mechanics approach can be employed for nanoscale to simulate the effect of fracture in single-walled carbon nanotubes (SWCNTs). In this study, an extended finite element method is used to simulate crack propagation…
We have characterized the spectroscopic magneto-optical response of a ${({\text{Pr}}_{0.4}{\text{La}}_{0.6})}_{0.7}{\text{Ca}}_{0.3}{\text{MnO}}_{3}$ thin film in the visible. We find, in addition to the conventional linear magneto-optical response, two distinct nonlinear contributions corresponding to the quadratic m…
CdSe-core, ZnS-capped semiconductor nanoparticles - quantum dots (QDs) - have been at the forefront of biomedical nanotechnology research thanks to their unique optical Η photophysical properties. In the present study the impact of the particle coating and size on their in vivo fate after intravenous (IV) injection in…