Materials Literature
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Abstract Poly(methyl methacrylate) (PMMA) films containing photochromic spiropyran (SP) derivatives with an alkyl chain produced surface relief structures upon photoirradiation. The material moved from the dark to the irradiated part by the light longer than 350 nm from a high‐pressure mercury lamp. This is the first…
In this preliminary work we have prepared a fluorinated polymer capable of solubilizing an appreciable amount of O(2) and, at the same time, maintaining a higher water solubility than perfluoroalkanes investigated as injectable O(2) carriers. In particular, we describe the synthesis and characterization of a new macro…
A nematic comb-shaped copolymer and its nanocomposites containing 0.063−0.54 in vol % of silver nanoparticles were studied by broadband dielectric spectroscopy. The frequency dependence of specific alternating current (ac) conductivity was used to estimate the temperature-frequency intervals of charge transfer by long…
A first-principles-based approach is developed to mimic the (asymmetric) screening of the depolarizing field at the top surface of ferroelectric ultrathin films. Varying the magnitude of this one-side screening (i) results in the formation of different kinds of periodic nanostripe domain patterns, including original o…
A neodymium oxalatophosphonate and its praseodymium analogue, Na[Nd 3 (H 2 O) 4 (C 2 O 4 ) 4 (CH 3 PO 3 )]·2H 2 O and Na[Pr 3 (H 2 O) 4 (C 2 O 4 ) 4 (CH 3 PO 3 )]·2H 2 O, have been synthesized by a hydrothermal method and characterized by single-crystal X-ray diffraction and thermogravimetric analysis. We studied the…
A nonmetal pentaborate [C 2 H 10 N 2 ][B 5 O 8 (OH)] ( I ) was synthesized by a solvothermal method at 150 °C and characterized by elemental analysis, IR, thermogravimetric analysis, and X-ray diffraction. The structure of I was determined by a single-crystal technique. It crystallizes in the monoclinic system with sp…
Preface. List of Contributors. Part I Design and Operation. 1 MTU's Carbonate Fuel Cell HotModule (Gerhard Huppmann). 1.1 The Significance of Fuel Cells. 1.2 Basic Statements of Power Production and Combined Heat and Power Systems. 1.3 Fuels for Fuel Cells. 1.3.1 Fuels Containing Gaseous Hydrocarbons. 1.3.2 Synthesis…
INTRODUCTION In both natural environments and human-made systems, a phylogenetically diverse and heterogeneous group of anaerobic sulphate-reducing bacteria (SRB) (Barton, 1985; Odom and Singelton, 1993; Postgate, 1984) thrive as members of complex microbial communities, living on surfaces of particles, minerals and m…
The characteristic of cold-adapted enzymes, high catalytic efficiency at low temperatures, is often associated with low thermostability and high flexibility. In this context, we analyzed the catalytic properties and solved the crystal structure of phenylalanine hydroxylase from the psychrophilic bacterium Colwellia ps…
We use oxygen vacancy formation energy (OVFE) as a measure of how easily lattice oxygen may participate in the Mars and Van Krevelen mechanism for oxidation reactions. We calculate with density functional theory how OVFE is affected when some of Zn atoms in ZnO(101̄0) surface layer are substituted by other metal dopan…
${\mathrm{ZrW}}_{2}{\mathrm{O}}_{8}$ undergoes a high-pressure amorphization transition above 1.5 GPa to a phase which is recoverable to ambient conditions. Reverse Monte Carlo modeling of neutron and x-ray total scattering data from ${\mathrm{ZrW}}_{2}{\mathrm{O}}_{8}$ recovered from $\ensuremath{\sim}4\text{ }\text{…
High-molecular-weight polyricinoleate, with an M(w) of 100,600, was enzymatically prepared by the polycondensation of methylricinoleate using immobilized lipase from Pseudomonas cepacia (IM-PC) in bulk in the presence of 4 A molecular sieves at 80 degrees C for 7 d. Polyricinoleate was a viscous liquid at room tempera…
Three different varieties of mesoporous silicas were synthesized by varying the postsynthesis treatment of an as-synthesized ordered mesoporous material type MCM-41. The resulting materials consisted of a purely siliceous MCM-41, a pore-expanded MCM-41 (PE-MCM-41C), and a surfactant-laden pore-expanded MCM-41 (PE-MCM-…
Lipid and fatty acid composition are considered to be key parameters that determine the nutritive quality of phytoplankton diets for zooplanktonic herbivores. The fitness, reproduction and physiology of the grazers are influenced by these factors. The trophic transfer of lipids and fatty acids from algal cells has bee…
A new method to prepare silver nanoparticles was reported in this paper, whichbased on aqueous-gaseous phase reaction of silver nitrate solution and ammonia gas. Theproposed method is effective, rapid, and convenient. Transmission electron microscope(TEM) and X-ray diffraction (XRD) were used to characterize the struc…
Stereoblock poly(lactic acid) (sb-PLA) is incorporated into a 1:1 polymer blend system of poly(L-lactic acid) (PLLA) and poly(D-lactic acid) (PDLA) that has a high molecular weight to study its addition effect on the stereocomplex (sc) formation of PLLA and PDLA. The ternary polymer blend films are first prepared by c…
The controlled hydrothermal preparation of NaYF(4) as both cubic and hexagonal phase types with specific associated morphologies, nanospheres and microtubes, respectively, has been achieved in the absence of organic solvents. The hexagonal NaYF(4) compound can be prepared in novel microtubular form and directly co-dop…
High refractive aromatic polyimides (PIs) containing a thianthrene-2,7-disulfanyl moiety in their main chain have been developed. The PIs were prepared from a newly developed aromatic diamine 2,7-bis(4-aminophenylenesulfanyl)thianthrene (APTT) and several aromatic dianhydrides by a two-step polycondensation procedure.…
Recent theory and measurements of the velocity of current-driven domain walls in magnetic nanowires have re-opened the unresolved question of whether Landau-Lifshitz damping or Gilbert damping provides the more natural description of dissipative magnetization dynamics. In this paper, we argue that (as in the past) exp…
MnWO4 has attracted attention because of its ferroelectric property induced by frustrated helical spin order. Strong spin-lattice interaction is necessary to explain ferroelectricity associated with this type of magnetic order.We have conducted thermal expansion measurements along the a, b, c axes revealing the existe…