Materials Literature
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Self-complexation of triblock copolymers based on undeca- and heptadecathiophene cores attached to generation three Fréchet-type poly(benzyl ether) dendrons in solution at low temperature leads to the formation of relatively small but well-defined supramolecular assemblies. The formation of these aggregates is associa…
Metalladendrimers of generation 3 with either 24 terminal palladium or ruthenium diphosphine complexes or one ruthenium diphosphine complex located at the core have been found to be efficient, recoverable catalysts in three general organic reactions: Stille couplings, Knoevenagel condensations, and Michael additions.
Ultrathin, passivating films are attractive for protecting metal surfaces without completely masking substrate properties. Alternating polyelectrolyte deposition of layered poly(acrylic acid)/poly(allylamine hydrochloride) (PAA/PAH) films on Al produces ultrathin coatings that protect Al from Cl - -induced corrosion.…
We report the uniform planar anchoring of thermotropic liquid crystals on films of bovine serum albumin (BSA) covalently immobilized on the surface of glass microscope slides and mechanically rubbed using a cloth. The azimuthal orientations of the liquid crystals were measured to be parallel to the direction of rubbin…
The electrical properties of ferroelectric substances are investigated and related to the Curie-Weiss law. A cryogenic experiment suitable for students measures the electrical susceptibility of strontium titanate in the 90-300 K temperature range. By measuring the electrical susceptibility of a modified barium titanat…
A new class of low band gap thiophene polymers prepared from ( E )-α-cyanoethylene thiophene derivatives were electrochemically and physically evaluated as active electrode material for electrochemical supercapacitors. The corresponding polymers were prepared by electrochemical polymerization of these monomers from a…
With the rapid advances in the field of biotechnology during the last decade, many peptides and proteins have been produced and evaluated for therapy of various diseases, including cancer. However, rapid clearance and the possibility of immunogenicity after the in vivo administration of these biotechnology-driven prod…
This chapter gives a description of semiconductor surfaces, and the models used to explain them. Section 7.1 outlines ideas of bonding in elemental semiconductors, and these are used to discuss case studies of specific semiconductor surface reconstructions in section 7.2, building on the survey given in section 1.4. I…
For the first time giant free-standing monomolecular films of a functionalized poly(2-methyloxazoline)- block -poly(dimethylsiloxane)- block -poly(2-methyloxazoline), PMOXA−PDMS−PMOXA, triblock copolymer were prepared. Stable films with areas up to about 1 mm 2 and thickness of 10 nm were achieved. This triblock copol…
The relative configurational entropy per cell as a function of length scale is a sensitive detector of spatial self-similarity. For Sierpinski carpets the equally separated peaks of the above function appear at the length scales that depend on the kind of the carpet. These peaks point to the presence of self-similarit…
CdTe nanocrystals capped with 1-mercapto-2,3-propandiol, CdSe nanocrystals capped with sodium citrate, and core−shell CdSe/CdS nanocrystals capped with sodium citrate were synthesized in aqueous solutions, and their surface was modified by 3-mercaptopropyltrimethoxysilane (MPS) in water−ethanol mixtures. By addition o…
This book covers the experimental and theoretical understanding of surface and thin film processes. It presents a unique description of surface processes in adsorption and crystal growth, including bonding in metals and semiconductors. Emphasis is placed on the strong link between science and technology in the descrip…
Este trabajo está dedicado al proceso de aleación mecánica como método de obtención de polvos. En él se repasan los aspectos más importantes implicados en el proceso, los fundamentos, así como su aplicación particular a la obtención de polvos metálicos.
The thermal behavior of a self-assembled silver alkanethiolate layered material (AgSC n, n = 12) has been explored using two spectroscopic techniques: 13 C CPMAS NMR ( 13 C cross-polarization magic angle spinning NMR) and FTIR (Fourier transform infrared) spectroscopy. The goal was to correlate structural changes moni…
The objective of this work was to apply the oxidative test Rancimat to dried microencapsulated oils (DMO), with special emphasis on assessing the efficacy of natural antioxidants. DMO were prepared by freeze-drying emulsions containing sodium caseinate, lactose and fish or sunflower oils, with and without added the an…
V-loaded anatase materials with V/Ti molar ratios in the range 0.02−0.06 have been prepared by a sol−gel procedure under inert atmosphere. Combining macroscopic (XRD, TEM, and BET) and spectroscopic (XPS, Raman, ESR, and 51 V NMR) techniques, we show that most of the V species are incorporated within the anatase bulk…
The deformation of a single crystal of aluminium in the Goss orientation {011}⟨100⟩ containing a coarse particle of silicon was modelled by using a finite-element (FE) code based on the crystal plasticity approach. The simulations clearly captured the heterogeneous deformation of the aluminium matrix, resulting in a r…
The thionylphosphazene cation [NSO(NPCl 2 ) 2 ] + is a proposed intermediate in the thermal ring-opening polymerization of the cyclic thionylphosphazene NSOCl(NPCl 2 ) 2 ( 1 ) at 165 °C. The attempted generation of [NSO(NPCl 2 ) 2 ] + via halide abstraction from 1 with a variety of Lewis acids has been studied and the…
Nonlocal DFT provides an excellent description of the structural and conformational properties of metallohydroporphyrins and related complexes. The Ni(II) complexes are found to be strongly ruffled and the Zn(II) complexes planar, consistent with experimental results. The increased flexibility of the novel chlorophin,…
In a previous paper, it was shown that the functional polysaccharide kappa-carrageenan acts as an efficient stabilizer to prevent the precipitation of iron oxides and hydroxides up to very high pH values (Jones, et al. Colloid Polym. Sci. 2000, 278, 491-501). Here, this process was investigated for its application to…