Materials Literature
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Engineered iron nanoparticles, with sizes smaller than 100 nm, have been of high concern because of their promising capability in environmental remediation. Nanoparticles based on zero-valent iron (nZVI) have the potential not only to migrate in the environment and interact with pollutants but also influence the livin…
Homogeneous precipitation of hydroxides was investigated as an alternative method to synthesize Fe‐doped aluminum oxide (α‐Al 2−2 x Fe 2 x O 3 ) particles over which carbon nanotubes (CNTs) were grown via a catalytic chemical vapor deposition (CCVD) method. Performance of the homogeneously precipitated particles for C…
Abstract Bucky gels are considered novel electro active polymers based on carbon nanotubes (CNTs). They are used to make electrochemical actuators that operate with a solid polymer electrolyte and so can work in air at low voltage (2–4 V) for long time with a maximum strain of approximately 1% and operating frequencie…
Abstract By using oxidising environments during catalyst formation, SiO 2 ‐supported thin Ni films restructure into small nanoparticles of reduced mobility that nucleate vertically‐aligned carbon nanotubes (CNTs) by base mode. Conversely, typical reducing environments yield entangled nanotubes only, which grow by tip…
Existing steel bridges are subjected to both increasing traffic loads and natural aging, both are capable of causing severe durability problems. Dependable rehabilitation methods are attracting attention as the promising methods to enhance structural durability and/or structural performance. One possible rehabilitatio…
The electrochemical performance of solid oxide fuel cells with cathodes made of La0.58Sr0.4Fe0.8Ni0.2O3−δ, La0.58Sr0.4Fe0.8Cu0.2O3−δ, La0.58Sr0.4Fe0.6Cu0.2Co0.2O3−δ, La0.58Sr0.4Fe0.7Cu0.1Co0.2O3−δ, and La2Ni0.6Cu0.4O4 has been investigated. As reference, electrochemical data from cells with La0.58Sr0.4Co0.2Fe0.8O3−δ c…
Abstract Pyridyl group-bound tris-urea 2, whose structure is similar to the tris-urea low molecular weight gelator (LMWG) 1, was synthesized. Addition of a trace amount of 2 and Pd(OAc)2 to 1 resulted in a reduction in the critical gelation concentration (CGC) in acetone. Metal–ligand interaction between Pd(OAc)2 and…
Abstract We study the strength of the binding of 4d and 5d transition metals on a graphene sheet in the limit of low‐ and high‐coverage using first principles density functional theory. A database of the binding energies is presented. Our results show that Mo, Hf, Ta, and W bind strongest to the graphene sheet. We fin…
Ordered two-dimensional (2D) arrays of β-HgS nanocrystal aggregates were prepared successfully at the air/water interface through the interfacial reaction between Hg(2+) ions in the subphase and H(2)S in the gaseous phase under the direction of liquid-expanded monolayers of arachidic acid (AA). These 2D arrays are com…
Abstract Raman scattering is a common technique for studying carbon nanotubes due to the possibility to observe the radial breathing mode (RBM), which is used for identification of single wall carbon nanotubes “SWCNT.” Using tip‐enhanced Raman scattering (TERS) we show along a small SWCNTs bundle that the RBMs are wel…
We study all possible band-to-band transitions between 12 valence and 16 conduction bands of (8,0), (10,0), and (7,0) nanotubes and calculate the corresponding dipole moments using first-principles methods in a wide ultraviolet-visible-infrared range of photon energies. The goal is to investigate the optical transitio…
We report a significant improvement in the synthesis of disassembling dendritic structures by using 4-hydroxy-3-nitrobenzoic acid as the building block. We have prepared multigram quantities of first- through third-generation linearly disassembling dendrons containing a [3-N,4-O]-benzylaryl ether disassembly pathway,…
The surface properties of poly(styrene oxide)-poly(ethylene oxide) block copolymers EO 12 SO 10, EO 10 SO 10 EO 10, and EO 137 SO 18 EO 137 at the air−water (a/w) and chloroform−water (c/w) interfaces have been analyzed by Tracker drop tensiometry, Langmuir film balance, and atomic force microscopy (AFM). The kinetic…
Hazards evaluation was performed to investigate the thermal instability and incompatibility of tert-butyl hydroperoxide (TBHP) solution with various diluents. Two calorimeters, differential scanning calorimetry (DSC) and vent sizing package 2 (VSP2), are frequently used to characterize the inherent thermal hazards and…
Abstract Titanium dioxide films were grown on unheated substrates by mid‐frequency (100 kHz) reactive pulsed magnetron sputtering at different O 2 partial pressures in an Ar/O 2 atmosphere. X‐ray diffraction and absorption measurements reveal a transition from amorphous anatase to nanocrystalline rutile with [O 2 ], w…
Abstract Nanocrystalline Fe 53 Co 47 alloy was synthesized by a single‐step transmetallation chemical method at room temperature. The Fe 53 Co 47 alloy nanoparticles of 77 and 47 wt% were dispersed in silica matrix by the sol–gel process using tetraethyl orthosilcate. Structural studies reveal that the as‐prepared all…
Polymer research in the field of biomedicine is driven on the one hand by the high clinical need for multifunctional biomaterials as an enabling technology for modern therapies and on the other hand by the fundamental scientific interest to understand and mimic functions of biological materials such as the extracellul…
In this paper, we report a simple technique for making bulk Si‐based ceramics from polymeric precursor. In this technique, a porous polymer preform with high porosity is used as a template. The preform is thermally decomposed before the precursor during pyrolysis to form interconnected pores for releasing gaseous spec…
Abstract Contact angle of water and formamide droplets on natural quartz crystals were observed. The specific surface free energy (SSFE) of m, r, and z faces, calculated using the Fowkes approximation, were approximately 54‐69 mN/m. The length of the normal line from the center of the crystal to each face ( h i ) was…
Abstract We review recent theoretical results aiming at understanding the impact of doping and functionalization on the electronic transport properties of nanotubes, nanowires and graphene ribbons. On the basis of ab initio calculations, the conductance of micrometer long tubes or ribbons randomly doped or grafted can…