Materials Literature
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We report a novel phenomenon in carbon nanotube (CNT) based devices, the transphonon effects, which resemble the transonic effects in aerodynamics. It is caused by dissipative resonance of nanotube phonons similar to the radial breathing mode, and subsequent drastic surge of the dragging force on the sliding tube, and…
We have studied the role of defects on the magnetic properties of carbon materials using first-principles density functional methods. We show that, while the total magnetization decreases both for diamond and graphite with increase in vacancy density, the magnetization decreases more rapidly for graphitic structures.…
Surface functionalization is one of the key steps toward the utilization of mesoporous materials in different applications. In this study, we characterized amino-functionalized mesoporous SBA-15 silicas that have been prepared by different means; co-condensation, post-grafting of amino-silanes, and surface hyperbranch…
Magnetization reversal by a femtosecond circularly polarized laser pulse has been recently demonstrated in rare-earth doped transition metals (RE-TM). The switching mechanism has been attributed to an inverse Faraday effect and thermal effects. Based on the parameters provided in the experimental work, we show that th…
Ferroelectricity is observed in orthorhombic $\mathrm{H}\mathrm{o}\mathrm{Mn}{\mathrm{O}}_{3}$ and $\mathrm{Y}\mathrm{Mn}{\mathrm{O}}_{3}$ at the magnetic lock-in transitions into an $E$-type structure or an incommensurate phase with a temperature independent wave vector, respectively. In $\mathrm{H}\mathrm{o}\mathrm{…
The intercalation reaction of graphite oxide with diaminoalkanes, with the general formula H2N(CH2)nNH2 (n = 4-10), was studied as a method for synthesizing pillared graphite with tailored interlayer spacing. Interlayer spacings from 0.8 to 1.0 nm were tailored by varying the size of the intercalant from (CH2)4 to (CH…
Silicon carbide particles exhibit both electric and magnetic optical resonances, allowing unexplored dielectric metamaterial designs. Experimental extinction spectra and Mie theory calculations of single microscale rod-shaped particles reveal three observable midinfrared resonant modes. Two of the modes are degenerate…
The silk filament spun by the silkworm (Bombyx mori) is composed of two fibroin filaments held together by a cementing layer of sericin. Fibroin and sericin account for about 75 wt% and 25 wt% of the raw silk, respectively. The degumming process consists in removing the sericin layer prior to dyeing using a solution o…
Nanoliposomes are useful carriers in drug delivery. Radiolabeled nanoliposomes have potential applications in radiotherapy and diagnostic imaging. In this study, the biodistribution and pharmacokinetics of 188Re-BMEDA-labelled pegylated liposomes (RBLPL) and unencapsulated 188Re-BMEDA administered by the i.v. route in…
Motivated by recent reports on high Curie temperatures in Cr- and Mn-doped aluminum nitrides and the fabrication of heavily transition-metal-doped ones with room-temperature ferromagnetism, we study systematically 12.5% transition-metal substituted aluminium nitrides, hexagonal ${\mathrm{CrAl}}_{7}{\mathrm{N}}_{8}$ an…
Ionisches Lösungsmittelgemisch: Ein bei tiefer Temperatur schmelzendes eutektisches Gemisch aus Cholinchlorid und einer Carbonsäure kann zur Synthese von Cobaltalumophosphaten eingesetzt werden. Eines dieser neuartigen Zeolith-Analoga enthält ungewöhnliche offene Doppelvierring-Einheiten, in denen ein Cobaltatom eine…
CdSe nanocrystals were synthesized in aqueous solutions using gelatin as a stabilizer. An appreciable improvement of photoluminescence efficiency of nanocrystal-containing polymeric films was achieved by passivation of as-formed nanocrystals in solutions with CdS and ZnS. The passivation-induced variation of the photo…
Lead zinc niobate–lead zirconate titanate thick films with a thickness of 50–100 μm were deposited on silicon and alumina substrates using the aerosol deposition method. The effects of excess lead oxide (PbO) on stress relaxation during postannealing were studied. Excess PbO content was varied from 0 to 5 mol%. The as…
Medium density fiberboard (MDF) panels were made with aspen fiber and 0-95% chicken feather fiber (CFF) in 2.5%, 5%, or 25% increments, using 5% phenol formaldehyde resin as the adhesive. Panels were tested for mechanical and physical properties as well as decay. The addition of CFF decreased strength and stiffness of…
We demonstrate a tunable filter consisting of a subwavelength resonant grating filter cladded by a liquid crystal cell. The resonant wavelength of the grating filter is tuned by electrically varying the refractive index of the liquid crystal. A tuning range of around 20 nm has been achieved.
An experimental study of the low temperature magnetotransport in optically transparent single-wall carbon nanotube (SWNT) networks is reported. The SWNT network shows Coulomb gap variable-range hopping conduction at low temperatures. The magnetoresistance (MR) involves the interplay of two phenomena: a forward interfe…
We have developed surfaces for the selective presentation of biotinylated peptides and proteins in a background that resists nonspecific protein adsorption; controlled amounts of biotinylated poly(ethylene glycol) (MW 3400 Da; PEG3400) anchored to titanium-dioxide-coated surfaces via an adhesive tri-peptide sequence o…
To determine the nanostructure of gelatin from catfish (Ictalurus punctatus) skin, atomic force microscopy (AFM) was used to study gelatin aggregates. The gelatin was extracted at an optimized acid concentration after alkaline processing. First, the AFM imaging parameters were optimized to obtain high-quality images.…
We propose a new metamaterial with a gradient negative index of refraction, which can focus a collimated beam of light coming from a distant object. A slab of the negative refractive index metamaterial has a focal length that can be tuned by changing the gradient of the negative refractive index. A thin metal film pie…
Submicrometer lanthanum ortho‐niobate (LaNbO 4 (LN))‐based powders have been prepared by spray pyrolysis of an aqueous solution containing stable La–EDTA and Nb–malic acid complexes. The powders had a particle size of ∼0.1 μm, a narrow particle size distribution, and high purity after calcination above 800°C. The powd…