Materials Literature
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In an effort to control particle diffusion near surfaces, we have studied the dynamics of colloidal hard spheres and soft compliant star copolymers on surfaces coated with polymer brushes using evanescent wave dynamic light scattering. The same experiments provide information on the brush structure and confined partic…
Mesoporous silica helical fibers in many different shapes have been synthesized in a highly dilute silicate solution at pH approximately 2.0 by using CnTMAB-SDS-P123 (n = 14-18) ternary surfactant as a template. The mesoporous silica helical fibers possess a well-ordered hexagonal mesostructure, high surface area, and…
A method for size-controlled synthesis of silver nanocomplex is proposed and described. The synthesis is based on the reduction of silver nitrate (AgNO 3 ) by a UV-irradiated arginine (Arg)−tungstosilicate acid (TSA, H 4 SiW 12 O 40 ) solution. The method allows synthesis of spherical particles of diameter between sev…
Structures and magnetic properties of gold-coated transition-metal clusters [Mn 13 @Au 20 ] - and [Co 13 @Au 20 ] - are studied within the framework of gradient-corrected density functional theory. The gold coating can result in either an enhanced or an attenuated effect on the magnetism of the core clusters. For [Mn…
It is known that the combination of laser light and its sensitizer is effective for noninvasive tumor treatment, referred to as photodynamic therapy. Using the combination of ultrasound and its sensitizer has also been suggested for a similar kind of tumor treatment, referred to as sonodynamic therapy. The purpose of…
The photoluminescence from CdSe/ZnS core/shell quantum dots, modified to make them water-soluble by exchanging the surface ligands with dihydrolipoic acid, is partially quenched by adding the chromium(III) complex trans -Cr(cylcam)(ONO) 2 + ( 1, BF 4 - salt). This quenching, attributed to the formation of electrostati…
A formulation for the whey protein isolate film or coating incorporating ascorbic acid (AA-WPI film or coating) was developed. Tensile and oxygen-barrier properties of the AA-WPI film were measured. Antioxidant effects of the AA-WPI coating on roasted peanuts were studied by comparing the values of peroxide (PO), thio…
The wetting of rough honeycomb micrometrically scaled polymer substrates was studied. A very strong dependence of the apparent contact angle on the drop volume has been established experimentally. The environmental scanning electron microscopy study of the fine structure of the triple line is reported first. The tripl…
A set of substituted (sulfonate, amino) nickel porphyrin derivatives such as phthalocyanine and phenylporphyrin was studied by spectroscopic (UV-vis, FTIR, XPS) and quantum-chemical methods. The Q and Soret bands were identified in the UV-vis spectra of aquo solutions of the tetrasulfo-substituted complexes and in DMF…
Nanocomposites were prepared by solution blending of polyhedral oligomeric silsesquioxane with phenethyl substituents (PhenethylPOSS) into poly(bisphenol A carbonate) (PBAC). The nanocomposites were investigated by dielectric spectroscopy, differential scanning calorimetry (DSC) and density measurements. PhenethylPOSS…
A systematic study of the optical effects derived from plasmon coupling in mono- and multilayers of gold nanorods is presented. The monolayers were prepared using the standard polyelectrolyte-assisted layer-by-layer (LbL) method and gold nanorods coated with either poly(N-vinyl pyrrolidone) or homogeneous silica shell…
Monodispersed, uniform, gold encapsulated−mesoporous silica nanocomposites of 100−350 nm diameter with a centered metal core at about 15 or 30 nm and high gold occupancy are prepared by pseudomorphic transformation of preformed gold−silica nanospheres. The characterization by X-ray powder diffraction, transmission ele…
Four perovskite catalysts LaBO 3 (where B = Cr, Mn, Fe, and Co) were prepared via a highly exothermic and self-sustaining reaction, the so-called “solution combustion synthesis (SCS)”, and characterized by means of X-ray diffraction, BET, field-emission scanning electron microscopy−energy-dispersive spectrometry, and…
A method to measure thermophysical characteristics (TPC) of conductive materials is described. The method is based upon controlled bulk (e.g., Ohmic) heating and measurement of the averaged over the volume of a sample temperature and the temperature of the surface of a sample. To measure averaged over a sample volume…
Nanocrystalline powders of Y2SiO5 doped with Eu3+ ions were obtained by a sol-gel technique. The morphologic changes produced by thermal treatments were monitored using X-Ray Diffraction (XRD), Fourier- Transform Infrared Spectroscopy (FT-IR) and luminescence spectroscopy.
In the general framework of non-linear elasticity, a subtle effect of plasticity recently observed in alloys at room temperature, i.e. the gliding instability of dislocations near axi-symmetrical precipitates, has been explained by means of static atomistic simulations. It is demonstrated that the interaction usually…
Neodymium-Iron-Boron (NdFeB) is a material with important magnetic properties, mostly used in permanent magnet fabrication. Thin layers of NdFeB are needed for miniaturization in electrical engineering, electronics, and for high-tech devices. We applied pulsed lased deposition (PLD) and radio frequency plasma assisted…
The effect of substituting Sr for Ba on the magneto-transport and magnetic properties of the (La 2/3 Sm 1/3 ) 0.67 Ba 0.33 MnO 3 system has been investigated. The samples of (La 2/3 Sm 1/3 ) 0.67 Ba 0.33− x Sr x MnO 3 ( x = 0.0, 0.1, 0.2 and 0.33) are synthesized by the citrate gel route and crystallize in an orthorho…
We fabricated a grating reference with EB cell projection lithography and silicon dry etching, instead of conventional 240-nm pitch grating references fabricated with laser-interferometer lithography and anisotropic chemical wet etching. We developed a novel 100-nm pitch grating reference based on our grating referenc…
Patterns of lines and trenches with nominal linewidths of 50 nm have been proposed for use as an overlay target appropriate for placement inside the patterned wafer die. The National Institute of Standards and Technology (NIST) Scatterfield Targets feature groupings of eight lines and/or trenches which are not resolva…