Materials Literature
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Nanodiamond from ozone purification (NDO) demonstrates very distinctive properties within the class of detonation nanodiamonds, namely very high acidity and high colloidal stability in a broad pH range. To understand the origin of these unusual properties of NDO, the nature of the surface functional groups formed duri…
AIMS: To develop novel polypropylene composite materials with antimicrobial activity by adding different types of copper nanoparticles. METHODS AND RESULTS: Copper metal (CuP) and copper oxide nanoparticles (CuOP) were embedded in a polypropylene (PP) matrix. These composites present strong antimicrobial behaviour aga…
ADVERTISEMENT RETURN TO ISSUEPREVReviewNEXTRedox Reactions Catalyzed by Isolated EnzymesDaniela Monti, Gianluca Ottolina, Giacomo Carrea, and Sergio Riva*View Author Information Istituto di Chimica del Riconoscimento Molecolare, C.N.R., Via Mario Bianco 9, 20131 Milano, ItalyE-mail: [email protected]Cite this: Chem. R…
Silica nanoparticles (SiO(2)-NPs) are being used increasingly in diagnosis, imaging, and drug delivery for the central nervous system. However, to date, little is known concerning the potential adverse effects on the brain associated with exposure to SiO(2)-NPs. The present study was conducted to trace, locate, and qu…
Vesicles breathe CO2! A new type of vesicle that self-assembles from amidine-containing diblock copolymer displays “breathing” features. Treating the vesicles with CO2 or Ar can reversibly tune the expansion and contraction of the vesicular volume, as if a bubble is breathing (see picture, PAD=poly((N-amidino)dodecyl…
We demonstrate a method of imaging spatially varying magnetic fields using a thin layer of nitrogen-vacancy (NV) centers at the surface of a diamond chip. Fluorescence emitted by the two-dimensional NV ensemble is detected by a CCD array, from which a vector magnetic field pattern is reconstructed. As a demonstration,…
We report the design, fabrication, and measurement of a microwave triple-band absorber. The compact single unit cell consists of three nested electric closed-ring resonators and a metallic ground plane separated by a dielectric layer. Simulation and experimental results show that the absorber has three distinctive abs…
The RadA intein from the hyperthermophilic archaebacterium Pyrococcus horikoshii was cloned, expressed and purified for subsequent structure determination. The protein crystallized rapidly in several conditions. The best crystals, which diffracted to 1.75 Å resolution, were harvested from drops consisting of 0.1 M HEP…
Quaternary Ni 50 Fe x Mn 30-x Ga 20 (x = 2.5, 5, and 15) and Ni 45 Fe 5 Mn 30 Ga 20 alloys based on modification of ferromagnetic shape memory alloy ternary Ni 50 Mn 30 Ga 20 composition prepared by vacuum arc melting and subsequent heat-treatment were investigated to understand the effect of varying Fe-content in Ni-…
Prasad A.K.S.K and Nienow J.A. 2011. Livingstonia (Thalassiosirales, Bacillariophyta), a new genus of fultoportulate centric diatoms from an Atlantic coastal plain river in Florida, southeastern United States. Phycologia 50: 264–280. DOI: 10.2216/09-89.1A morphological and taxonomic account of Livingstonia palatkaensi…
Slab optical waveguides were fabricated in tung-sten-tellurite glass doped with Er3 + ions by means of nitrogen ion implantation at 1.5 MeV. A wide range of ion doses (from 5·1012 to 8·1016 ions/cm2) was used. Optical characterization, performed by dark-line spectroscopy, revealed that the waveguides were of optical b…
The synthesis and characterization of two 18-crown-6 functionalized analogues of an extensively studied gadolinium texaphyrin derivative, motexafin gadolinium (1, MGd), are reported. These are the monomeric and dimeric species, compounds 2 and 3, respectively. Both crown ether functionalized species proved to be stabl…
We have proposed and modified a model of drying process of polymer solution coated on a flat substrate for flat polymer film fabrication supposing resist coating process in semiconductor engineering process and so on. And we have clarified dependence of distribution of polymer molecules on a flat substrate on a variou…
Most applications of mesoporous silica require some degree of functionalization. The surface of porous materials can be divided into external and internal (pore) surfaces, and in many cases, a selective functionalization of these surface subsections is desired. This short review outlines our recent work in this field…
We investigate the origin of fast 1.5 $\ensuremath{\mu}$m photoluminescence from Er-doped SiO${}_{2}$ sensitized with silicon nanocrystals, which appears and decays within the first microsecond after a short laser excitation pulse. Time-resolved and temperature-dependent measurements on the 1.5 $\ensuremath{\mu}$m emi…
The natural composite nacre is characterised by astonishing mechanical properties, although the main constituent is a brittle mineral shaped as tablets interdispersed by organic layers. To mimic the natural formation process which takes place at ambient conditions an understanding of the mechanism responsible for a de…
Abstract Based on coordination polymerization mechanism only, novel stereoregular graft copolymers with syndiotactic polystyrene main chain and isotactic polypropylene side chain (sPS‐ g ‐iPP) were synthesized via two steps of catalytic reactions. First, a chain transfer reaction was initiated by a chain transfer comp…
Ti 3 SiC 2 joining has been successfully achieved by depositing a thin Cu or Zr layer on it and heat treating at low temperatures of 950° or 1100°C in an argon atmosphere, respectively, which are ∼500°C lower than the previous solid solution joining method. X‐ray diffraction and scanning electron microscope analyses r…
The results presented in this paper compare the behavior of silicon nitride prepared with the addition of yttria as sintering additive, and of a sialon ceramic in contact with an aqueous solution of sodium chloride (NaCl) at T ≤290°C. Both studied ceramics dissolved by preferential attack of Si–N bonds in the matrix a…
Gastropods are characterized by their asymmetric bodyplan, which develops through a unique ontogenetic process called 'torsion'. Despite several intensive studies, the driving force of torsion remains to be determined. Although torsion was traditionally believed to be driven by contraction of the retractor muscle conn…