Materials Literature
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The strength of depletion interactions has been characterized by measuring the second virial coefficient, B 2 , of suspensions of lysozyme molecules in the presence of non-adsorbing polymer poly(ethylene glycol) (PEG). The solution properties of the PEG are characterized for three molecular weights (1000, 6000 and 12…
We review some of the theoretical results that we have obtained recently on the adsorption of polyelectrolytes on surfaces of opposite charge. We consider two problems, the formation of polyelectrolyte multilayers and the formation of complexes between rigid polyelectrolytes and small spheres. For polyelectrolyte mult…
The phase behaviour of a polydisperse mixture of hard spheres is examined within a moment-density approximation. The role of size fractionation and the difference between quenched and annealed phase behaviour is outlined. The quenched phase diagram shows a terminal level of polydispersity above which no fluid-crystal…
The possibility of using acoustic spectroscopy for the on-line and in-situ monitoring of particle size distributions and volume concentrations in batch crystallization processes is investigated. First, the acoustic technique is discussed, along with the evaluation of the involved model parameters. Second, for a seeded…
The Stille coupling reaction was explored to synthesize novel polymers with a pending NLO chromophore exhibiting a large μβ value but high chemical sensitivity. This approach enabled the synthesis of aromatic polyimides through the careful design of dibromo monomers bearing NLO chromophores. The resulting polyimide wa…
When a two-dimensional colloidal suspension of highly charged particles is subjected to a periodic one-dimensional (1D) light field, a liquid-solid transition can be induced. This phase transition is well known as light-induced freezing. However, upon further increase of the intensity, the crystal is found to remelt (…
Al 2 O 3 −TiO 2 materials were prepared by the sol−gel method using different additives (HNO 3, NH 4 OH, and CH 3 COOH) and their physical properties were evaluated by various techniques. The materials at two compositions (Al/Ti atomic ratios = 2 and 25) were synthesized at 278 K and calcined at temperatures from 573…
The salting-out effect of simple electrolytes on lysozyme has been studied by measuring the second virial coefficient B 2 of the osmotic pressure as a function of salt concentration, and for different salts. The aim of this work has been to find a microscopic counterpart of the empirical Hofmeister series for the effi…
A spiroconjugated nitronyl nitroxide biradical, 6,6‘-(4,4,5,5-tetramethylimidazolidine-3-oxide-1-oxyl)-3,3,3‘,3‘-tetramethyl-1,1‘-spirobisindane ( 1 ), has been prepared by functionalization of a 3,3,3‘,3‘-tetramethyl-1,1‘-spirobisindane framework followed by Ullman condensation and subsequent oxidation. The biradical…
The synthesis of hydroxy-terminated poly(ethylene glycol)- co -poly(ε-caprolactone) (MPEG−PCL) was investigated by the reaction of poly(ethylene glycol) and ε-caprolactone in the presence of stannous octoate. The polymerization was proved to be carried out in a controllable way. Bromo-terminated MPEG−PCL copolymer has…
This paper presents the state-of-the-art in studies of structure and dynamics of water confined in a prototype hydrophilic substrate: porous Vycor glass. Experimental data and molecular dynamics simulations are compared.
The process of dehydration for the molybdenum trioxide hydrates, MoO 3 2H 2 O 2-MoO 3 H 2 O -MoO 3 , was studied for the first time by in situ Mo K-edge x-ray absorption spectroscopy. A regularization procedure was applied to reconstruct the radial distribution functions around the molybdenum at all stages of the proc…
We report on telechelic associating polymers in aqueous solutions that self-assemble into starlike flowers in the dilute regime and develop a fully connected network of flowers above some threshold concentration φ* (∼1 wt %). The peculiarity of these telechelics is that the end caps are partially fluorinated. Small-an…
Three single crystals of sodium zeolite X were fully La 3+ -exchanged at 90 °C from aqueous solution (pH = 7.45, 7.45, and 6.89 at 22 °C, respectively). One was vacuum dehydrated at 400 °C (crystal 1), another at 22 °C (crystal 2), and the third remained fully hydrated (crystal 3). Their structures at 22 °C were deter…
We use a near-field scanning microwave microscope to simultaneously image the dielectric constant, loss tangent, and topography in a PbTiO_3 crystal. By this method, we study the effects of the local dielectric constant and loss tangent in the geometry of periodic domains on the measured resonant frequency, and qualit…
A closer look at the temperature (T) dependence of magnetoresistance (MR) of two polycrystalline magnetic compounds, LaMn$_2$Ge$_2$ and SmMn$_2$Ge$_2$, previously reported by us, is made. A common feature for both these compounds is that the low temperature MR is positive (say, below, 30 K) in spite of the fact that b…
Sulfonation of maleated EPDM (m-EPDM) rubber followed by its neutralization by sodium hydroxide or zinc acetate leads to the formation of an ionomer consisting of two types of ionic association, namely carboxylate and sulfonate anions with Na+ or Zn2+ as the counterion. The products were characterized by infrared spec…
The tensile strength and elongation at break of epoxidized natural rubber (ENR) blended with natural rubber (NR) was studied. ENR 25, ENR 50, and one grade of natural rubber (SMR L) were used as the elastomers. The composition of ENR was varied from 0% to 100% rubber. The accelerated sulfur vulcanization system was us…
CdS nanoparticles precipitated from aqueous solution were studied by 1 H NMR. The nanoparticles were deliberately not capped by any surface termination agent. The samples had porous structure. Proton high spinning speed magic angle spinning (MAS) NMR spectra revealed that there are three abundant proton species in nan…
Four derivatives of diethylenetriaminepentaacetic acid (=3,6,9-tris(carboxymethyl)-3,6,9-triazaundecanedioic acid (H5dtpa)), potential contrast agents for magnetic resonance imaging (MRI), carrying benzyl groups at various positions of the parent structure were synthesized and characterized by a thorough multinuclear…