Materials Literature
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Biodegradable polymers are used in medical devices such as fixation plates, sutures, or micro particles for the controlled release of drugs. Typical polymers are poly lactic acid (PLA), poly glycolic acid (PGA), and poly caprolactone (PCL). During degradation, the ester bonds within polymer chains are cleaved due to t…
A dehydriding property of xLiBH4 + (1 − x)Mg2FeH6 (x = 0.1–0.83) was investigated. The dehydriding reactions of pure LiBH4 and Mg2FeH6 start at approximately 650 and 450 K, and 12.5 and 4.3 mass% hydrogen are released, respectively. The property drastically changes by combining LiBH4 and Mg2FeH6. Within the compositio…
Ultra-high-temperature ceramics (UHTCs) are a group of materials that can withstand ultra high temperatures (1600-3000 oC) which will be encountered by future hypersonic re-entry vehicles. Future re-entry vehicles will have sharp edges to improve flight performance. The sharp leading edges result in higher surface tem…
OBJECTIVE: Concrete is a material which widely used as a neutron shielding and in building construction such as nuclear power stations, particle accelerators and medical hospitals. Concrete is very significant for neutron shielding, because of concrete is contain of some elements (hydrogen, iron etc.) to moderate the…
図 3 (La 0.7 Sr 0.2 Ba 0.1 )ScO 3-d (LSBS)ペロブスカイト型 酸化物の結晶構造．La 3＋ , Sr 2＋ , Ba 2＋ が A サイト (赤丸)を，Sc 3＋ が B サイト(紫丸)を，O が O1 及び O2 サイト(白丸)を占有．点線は単位胞を表 す． 図 4 (a)焼成前，及び(b)Pt 箔上，空気中，1898 K， 36 ks 焼成後の(La 0.7 Sr 0.2 Ba 0.1 )ScO 3-d (LSBS)粉 末． 図 5 (a)Pt/LSBS，(b)PtO 2 ･nH 2 O 及び(c)Pt 箔の Pt 周りの動径構造関数 (2)(6) ．
The elastic-plastic fracture toughness, JIc, of SM490B carbon steel plate was investigated in air and 0.7 MPa hydrogen gas. JIc tests were conducted in accordance with the JSME standard, JSME S001 (1981). JIc was much smaller in hydrogen at a displacement velocity of V = 2 × 10-3 mm/s (JIc = 10.0 kJ/m2) than in air at…
We report on the development of a non-hermetic micropackage technology that employs multiple layers of polydimethylsiloxane (PDMS), epoxy, and parylene-C thin films for conformal coating of chronic biomedical implantable systems with laboratory testing results in saline bath at 85°C, achieving very long micropackaging…
Zinc oxide thin films having various thicknesses between 100 nm and 400 nm were deposited on glass substrates by RF magnetron sputtering technique. These films have been analyzed for their structural, optical and electrical properties as a function of the thickness by a series of characterization techniques, including…
Facial peptide P1 carrying repeating hydrophobic and hydrophilic residues as well as lysine terminals self-assemble into uniform toroid structures. The sensitive balance between the hydrophobic interactions and electrostatic repulsion dominates the formation of highly curved assemblies.
Here, we present systematic studies on the removal of the polymer template from inverse hexagonally ordered poly(butadiene-block-2-dimethylaminoethyl methacrylate)–phosphomolybdic acid (H3PMo12O40) nanocomposites. Highly ordered mesophases are obtained via an evaporation-induced self-assembly process. Different techni…
The coordination complex of Ni(hfac)2 (hfac = 1,1,1,5,5,5-hexafluoroacetylacetonato) and the 4-(benzoxazol-2'-yl)-1,2,3,5-dithiadiazolyl (boaDTDA) neutral radical π-stacks in a one-dimensional "staircase" arrangement. This particular packing aligns regions of α and β spin densities on neighbouring Ni(II)(hfac)2(boaDTD…
The soluble polyimides were synthesized from the several types of diamine monomers having multiple long-chain alkyl groups, tetracarboxylic dianhydrides such as Cyclohexene-DA, 3,4’-ODPA (a-ODPA), DSDA, and DDE as a diamine co-monomer. The thin films of obtained polyimides were irradiated by UV light (λmax; 254 nm) ,…
A simple technique is demonstrated to produce twisted bi- and tri-layer graphene by mild sonication of exfoliated graphite on a large scale. No oxidation or reduction of graphite is involved in this process. Hydrothermally synthesized graphite-KCl compound is used to prepare exfoliated graphite.
We present measurements of the thermal fluctuations of the free surface of oil-in-water emulsions which exhibit a glassy behavior. The Surface Fluctuation Specular Reflection (SFSR) technique was applied to measure the free surface fluctuations. When the volume fraction of the oil droplets is close to or larger than t…
Ag@Au–Ag metal-core/alloy-shell nanoparticles were successfully synthesized via the localized galvanic replacement reaction in the channels of SBA-15. Since the nanoparticles were prepared in the channels of SBA-15, the size was restricted to around 7 nm. Such a small size and the alloy shell structure were proved to…
In this paper, a method for increasing bandwidth of metamaterial structures is presented. The metamaterial structures used in this study are based on Split Ring Resonators (SRRs), the most recognized structures for realization of metamaterials with negative magnetic permeability coe-cients. To increase the frequency b…
Nanoparticle drug delivery to tumors via the enhanced permeability and retention (EPR) effect is usually limited by the step of blood circulation and extravasation. Only less than 10% of the administered dose would eventually reach the tumor tissue. To enhance the drug delivery efficiency, we report the approach of ma…
The results of experimental research of high up to 200°C temperature influence and scale effect on temperature and shrinkage strain, creep and characteristics of strength and strain properties of high-strength modified fine and heavy concretes under axial compression are presented in the article. The practical way of…
(Bi0.5 Na0.5 )TiO3 ceramic was prepared by dry auto-combustion method using urea as a fuel. It was shown that the phase composition of the synthesized powder depends on the amount of urea. The X-ray diffraction study confirmed that single phase rhombohedral structure with space group R3C was obtained in the powder cal…
A versatile and facile synthetic approach to a series of fluorinated poly(arylene ether-1,3,4-oxadiazole)s has been described. The mild reaction conditions avoid the usage of moisture-sensitive agents and side-reactions associated with the conventional aromatic nucleophilic polycondensation. The polymers display excel…