Materials Literature
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PURPOSE: To evaluate the intratumoral distribution of liposome-encapsulated doxorubicin. MATERIALS AND METHODS: Tumor-bearing livers of 24 mice were studied with in vivo fluorescence and electron microscopy after injection of liposomal doxorubicin in the hepatic artery, portal vein, or tail vein. Distribution and upta…
The adsorption and thermal stability of vinyltriethoxysilane (VTES) was studied on a γ-Al 2 O 3 surface. Adsorption occurs near room temperature with the production of ethanol from the reaction with isolated surface Al OH groups, producing the surface species Al O Si(OC 2 H 5 ) 2 CH CH 2 . As the surface is heated, de…
The effect of thermo-oxidative aging on physical properties viz. modulus, tensile strength, elongation at break, tear strength and hardness of rice husk ash (RHA) and commercial fillers in ENR compounds have been studied. While the modulus and hardness increased with aging, other properties, i.e., tensile strength, el…
A correlation between the strength of the boson peak, R1(Tg), and the “fragility” of glass-forming liquids proposed earlier is reanalyzed more exactly for polymers. New experimental data are included, making the correlation more evident for the family of polymers. An additional correlation between R1(Tg) and the shape…
Single crystals of Cs 3 Bi 2 I 9 have been grown. Polarized-optical, dielectric, and calorimetric studies have been performed, along with measurements of birefringence, and the coefficients of elasticity c 44 , and linear expansion a over a wide temperature range. It is found that an intrinsic (pseudo-intrinsic) secon…
A spontaneous Raman scattering from the surface phonon modes (SPMs) of amorphous silica (SiO2) nanoparticles which is small compared with the excitation wavelength (514.5 nm) and aggregated in micron size clusters (globules) is utilized to determine the shape of particles. The excitation dynamics for these modes were…
A novel heterocyclic diamine monomer, 2-(4-aminophenyl)-6-amino-4(3 H )-quinazolinone was synthesized from readily available compounds in three steps in high yield. A series of novel polyimides containing the quinazolinone moiety were synthesized either by a one-step solution polymerization reaction or by a two-step p…
This article contains (i) an experimental EPR study on [4Fe−4S] 3+ and [4Fe−4S] + centers in single crystals of a model compound having an asymmetrical cubane-type cluster and (ii) a theoretical model for the interpretation of g -tensors of such states found in synthetic compounds and protein active sites. In the firs…
Samples of highly syndiotactic polypropylene (s-PP), when quench precipitated from solution, have an X-ray diffraction spectrum close to that calculated for the limit-ordered C 222 1 form II of s-PP. The solid state 13 C NMR CP MAS spectrum shows, however, evidences of the presence of a significant amount (≈20%) of lo…
Abstract The structure of Li- and Cs-montmorillonites was studied using infrared (IR) reflectance spectroscopy. The spectra of heat-treated clays between 80 and 220 °C were analyzed by Kramers-Krönig inversion in order to obtain the optical and dielectric properties of the clays. The analysis revealed the transverse-o…
Magnetic properties of two nitronyl nitroxide (4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazol-1-oxyl 3-oxide) radicals which show nearly isotropic S=½ alternating linear chains are investigated down to 0.5 K and up to 9 T. Pentafluorophenyl nitronyl nitroxide at low temperatures shows an antiferromagnetic chain with alte…
Vacuum drying and especially discontinuous vacuum drying is a very attractive process for such a wood as oak, because of a reduced drying time and a high quality of the final product. In this paper, a model describing heat, mass and momentum transfer in a capillary porous and hygroscopic medium under vacuum drying wit…
Bien que beaucoup de questions soient resolues en ce qui concerne l'oxydation acceleree des super alliages par les depots de sels corrosifs, il reste encore quelques questions sans reponses. La composition chimique du sel de mer qui entre dans les moteurs est differente de celle des sels qui adherent aux composants de…
A study of plastic instability in tension, which occurs well before the Considère criterion is met, is reported for face-centred cubic single crystals. The observations show that the instability is caused by a sudden effective decrease in work hardening resulting from the operation of a new dominant shear system. The…
The structures and characterization are described of complexes that exhibit an out-of-phase AC magnetic susceptibility x m” The dodecanuclear complexes [Mn12O12(O2CR)16(H2O)4]z contain 8MnIII, 4MnIV or MnII, 7MnIII, 4MnIV and possess ground state spins of S = 9 or 10 (z = 0) or S = 19/2 (z = −1). The distorted-cubane…
Abstract Non‐elastic deformation of amorphous polymers is studied from strain recovery tests. In particular, a strain recovery master curve is built. It allows one to estimate recovery times necessary to recover the whole non‐elastic deformation. On such a curve, two non‐elastic deformations, namely anelastic (nonline…
Novel regular network polyesters were prepared from pentaerythritol (Xp) and aliphatic dicarboxylic acids of different numbers of methylene groups (HOOC(CH 2 ) n - 2 COOH, n = 4, 6, 8, 9, 10, 12, 14, 16, and 20). Prepolymer prepared by melt polycondensation was cast from dimethylformamide solution and postpolymerized…
Abstract Common and different aspects of scanning electron microscope (SEM) and scanning ion microscope (SIM) images are discussed from a viewpoint of interaction between ion or electron beams and specimens. The SIM images [mostly using 30 keV Ga focused ion beam (FIB)] are sensitive to the sample surface as well as t…
Boron carbide pellets were irradiated in the experimental fast reactor “JOYO” to 10B burnup of up to 170x1026cap/m3, fluences of 2x1026/m2(E>0.1MeV), and maximum temperatures of about 1,200°C. Post irradiation examinations were made of microstructural changes, helium release, swelling, and thermal conductivity. Boron…
The static properties of a homopolymer melt between energetically neutral walls are studied as a function of the degree of confinement (plate spacing) and polymer molecular weight. The cooperative motion lattice model is used and allows all calculations to be performed at full occupancy (i.e., at a volume fraction of…