Materials Literature
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Intramolecular cross-linking of peptides by the light-sensitive compound diiodoacetamideazobenzene has been shown to permit reversible photocontrol of the helix-coil transition. Cross-linking between Cys residues spaced at i and i + 7 positions with the trans form of the linker was found to produce a decreased helix c…
One of the factors responsible for the high stability of water-in-bitumen or water-in-crude oil emulsions is the presence of a complex adsorbed layer of material at the water−oil interface. However, except for its role as a steric barrier, little is known about the nature and activity of this layer. Studying a macrosc…
Carbon single-walled nanotubes (SWNTs) and fluorinated SWNTs (F-SWNTs) were investigated by core and valence band X-ray photoelectron spectroscopy (XPS) and ultraviolet photoelectron spectroscopy (UPS). The core spectra were interpreted by chemical shift calculations based upon CNDO calculations, and the valence band…
Paper is one of the most important inventions in the history of civilization, and it is an essential commodity to all people in the world. The fact that we make ubiquitous use of a score of paper products makes it easy to underestimate its value and significance. This review is intended to put into perspective the dis…
The extensional and breathing modes of gold nanorods in aqueous solution have been examined by time-resolved spectroscopy. These experiments yield values for the elastic constants for the rods. The results show that gold nanorods produced by wet chemical techniques have a smaller Young's modulus than bulk gold. HRTEM…
Sodium bismuth titanate, (Na 0.5 Bi 0.5 )TiO 3 (NBT), thin films were grown on Pt/Ti/SiO 2 /Si substrates via a sol−gel process. The precursor solution for spin-coating was prepared from bismuth nitrate, sodium acetate, and titanium n -butoxide as starting materials, and acetic acid and methanol as solvents, and pervo…
The catalytic growth of single- and double-walled carbon nanotubes (SWNTs and DWNTs) by chemical vapor deposition (CVD) strongly depends on the support material. Not only the presence of nanopores in the support material but also the interaction with metal particles is believed to play an important role. Here, we stud…
The free energy of spin-crossover molecular systems studied so far deal with the inner degrees of freedom of the spin-crossover molecules and a variety of interaction schemes between the molecules in the high spin (HS) and low spin (LS) states. Different types of transition curves, gradual, abrupt, hysteresis, and als…
Silica nanoparticles functionalized with beta-cyclodextrin (CD) host molecules (5) have been prepared by reacting carboxylic active ester-terminated silica nanoparticles (4) with CD heptamine. Silica nanoparticles functionalized with glucosamine (6), having similar surface properties as 5 but lacking the host-guest re…
Water- and alcohol-soluble AuPd nanoparticles have been investigated to determine the effect of the organic stabilizing group on the thermal conductance G of the particle/fluid interface. The thermal decays of tiopronin-stabilized 3−5-nm diameter AuPd alloy nanoparticles, thioalkylated ethylene glycol-stabilized 3−5-n…
Self-consistent first principle calculations within the local density approximation were used to study the effect of lattice distortions on the electronic and magnetic properties of half $(\mathrm{NiMnSb})$ and full-Heusler $({\mathrm{Co}}_{2}\mathrm{CrAl})$ compounds. We find that $\mathrm{NiMnSb}$ is half-metallic f…
We demonstrate a flexible method for preparing hollow TiO2 nanospheres with movable silica nanoparticles inside (HTNMSNs). In this method, we used monodisperse silica--polystyrene core--shell nanospheres (SiO2-PS-CSNs) sulfonated as templates and prepared the composite shell consisting of TiO2 and sulfonated polystyre…
We simulated models of diffusion and aggregation in long pores of small widths in order to represent the basic mechanisms of coke deposition in catalysts' pores. Coke precursors are represented by particles injected at the pore entrance. Knudsen diffusion, which is usually expected inside the pores, is modeled by ball…
As the periodicity in crystalline materials creates the optimal condition for electronic delocalization, one might expect that in partially crystalline conjugated polymers delocalization is impeded by intergrain transport. However, for the best conducting polymers this presumption fails. Delocalization is obstructed b…
We investigate the stability of boron nitride conical sheets of nanometer size, using first-principles calculations. Our results indicate that cones with an antiphase boundary (a line defect that contains either B-B or N-N bonds) can be more stable than those without one. We also find that doping the antiphase boundar…
The polymerization of aniline intercalated into montmorillonite clay was monitored by in situ UV−vis−NIR and resonance Raman spectroscopies and in situ small-angle X-ray scattering. In the initial stages of the polymerization, it is observed the PANI−ES polaronic band at 750 nm in the UV−vis−NIR spectrum and also the…
In this work we address experimentally a number of unresolved issues related to microwave induced resistance oscillations (MIRO) and the zero-resistance states observed recently on very high-mobility 2D electron gases in GaAs/AlGaAs heterostructures. In particular, we examine electrodynamic effects via reflection/abso…
The Watts-Strogatz algorithm transferring a regular lattice to the small world network is modified by introducing preferential rewiring constrained by connectivity demand. The probability to link to/ unlink form a node is dependent on a vertex degree and adjusted by some threshold. For each threshold value there exist…
A comparative study of the crystalline and molecular structures of trifluoroacetate trihydrates of Tb(III) prepared from Tb(OH)_3 and Tb_2(CO_3)_3 by reaction with trifluoroacetic acid is made. Elemental analysis of the two reaction products in indicated them to be compounds of the same C_6H_6F_9O_9Tb. According to th…
The purification of protein complexes can be accomplished by different types of affinity chromatography. In a typical immunoaffinity experiment, protein complexes are captured from a cell lysate by an immobilized antibody that recognizes an epitope on one of the known components of the complex. After extensive washing…