Materials Literature
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A hole load of spheres: Nanoporous polyelectrolyte (PE) spheres are prepared through layer-by-layer deposition of oppositely charged poly(acrylic acid) and poly(allylamine hydrochloride) onto mesoporous silica spheres (with cross-linking by heating in each step), and the subsequent removal of the silica templates by h…
Abstract Nonisothermal solidifications of medical‐grade polylactides were conducted on compression molding sheets, resulting in a variety of crystalline forms and different amounts of crystallinity. Both optically pure polylactides, poly (L‐lactide) (PLLA) and poly (D‐lactide) (PDLA), were found to crystallize at a lo…
Cylindrical nanoholes reaching 500 μm in depth can be generated in Si(100) by immersing the wafer in a solution containing HF and H2O2 after loading the wafer with Ag nanoparticles. At the bottom of the holes, Ag particles are observed (see Figure). This suggests that the Ag particles bore into the wafer and that the…
We report the discovery of a family of organic compounds, substituted 1,3,5-benzenetrisamides, that depending on subtle details of their chemical structure are capable of selectively and extremely efficiently nucleating the growth of the common α-crystal modification of the major industrial polymer isotactic polypropy…
With the purpose of fabricating ceramics where ferroelectric and magnetic order coexist, ceramics of Pb(Fe1∕2Nb1∕2)O3 have been prepared using the traditional ceramic method following three different routes. The first is a direct via starting from oxide reagents and the other two use different kinds of FeNbO4 precurso…
How do crystals nucleate and grow? Why and how do crystals form such a wide variety of morphologies, from polyhedral to dendritic and spherulitic forms? These are questions that have been posed since the seventeenth century, and are still of vital importance today both for modern technology, and to understand the Eart…
Lightly crosslinked poly(4-vinylpyridine)–silica nanocomposite microgel particles are used to prepare either oil-in-water or water-in-oil “Pickering” emulsions at around pH 8–9. Rapid demulsification occurs below pH 3, since the addition of acid leads to the protonation of 4-vinylpyridine residues which, in turn, impa…
A superhydrophobic coating on gold threads (see Figure) has been fabricated by combining layer-by-layer assembly, electrochemical deposition, and surface modification. It can be used to mimic the legs of water striders, potentially leading to an understanding of the mechanism of structure reducing and quick propulsion.
Biocompatible magnetite nanocrystals (see Figure) are prepared by thermal decomposition of ferric triacetylacetonate in 2-pyrrolidone in the presence of monocarboxyl-terminated poly(ethylene glycol) (MPEG-COOH). The results reveal that MPEG is covalently bound to the nanocrystal surface by COOH groups. Magnetic resona…
Abstract Nanoparticle (NP) assemblies are of considerable interest for both fundamental research and applications, since they provide direct bridges between nanometer‐scale objects and the macroscale world. Unlike two‐dimensional or three‐dimensional NP assemblies, which have been extensively studied and reviewed, rep…
Strong neutron bombardment of graphite can displace many atoms from their lattice positions; many of the dislocated atoms do not anneal during the irradiation process and the net result is an increase of internal energy of the graphite. This increase is usually referred to as stored energy, or in the older literature…
This paper concerns the study of zirconium oxidation under irradiation with high energetic Xe ions. The irradiations were performed on the IRRadiation SUD (IRRSUD) beam line at Grand Accélérateur National d’Ions Lourds of Caen. The oxygen partial pressure was fixed at 10−3Pa and two temperature conditions were used, e…
The structural stability of carbon nanotori have been investigated by performing molecular‐dynamics simulations. The systems considered are C170, C250, C360, C520 and C750 tori, which have been constructed using a recently developed algorithm based on the idea of Fonseca et al. Calculations, have been realized by usin…
We studied the thermoelectric properties of InSb and Ga0.03In0.97Sb thin films grown by metalorganic vapor-phase epitaxy targeting a thermoelectric device with a high electron mobility. For InSb on sapphire, the maximum power factor (Pf) was 3.5×10−3W∕mK at 723K, and for InSb on SiO2 glass, the maximum Pf was 2.4×10−3…
A specific ac nanocalorimeter is presented for the study of kinetics in phase transitions. This apparatus designed by means of microfabrication technologies requires a 50-μm-thick solid or liquid sample. The use of the ac calorimetric method allows an operating frequency range around two decades combined with a very h…
A numerical study of microdomain coalescence induced by the soft-confined crystallization of lamellar diblock copolymers has been reported. It was found that under high temperatures those crystallites showing their orientational preferences perpendicular to the lamellar microdomains are responsible for the occurrence…
The Pt nanocrystals as nanonetwork conductors improved electrochromic properties of TiO2 such as increased optical modulation and fast response time, compared to pure TiO2 as well as TiO2 incorporated by amorphous Pt nanophases. It is likely that an enhancement of cathodic electrochromism in TiO2-Pt is due to an impro…
The HIPS-montmorillonite nanocomposites are prepared by the static melt intercalation method. XRD analysis indicates that the spacing of the silicate layers increased from 1.51 nm for the untreated montmorillonite to 3.44 nm for the HIPS-montmorillonite prepared by the melt intercalation method. The cone calorimeter t…
The magneto-Seebeck coefficient and magnetoresistivity of a polycrystalline bismuth microwire array were measured under magnetic fields of 0–2T and at temperatures of 50–300K. To avoid the influence of contact resistance between the wire array and the electrodes, bulk bismuth was used for the electrodes. In the absenc…
Abstract Ethylene vinyl alcohol (EVOH)–based packaging structures were analyzed in terms of both barrier properties and morphological alterations after a retorting process and as functions of ethylene content. From the results, it was found that the samples do have a substantial decrease in oxygen barrier properties a…