Materials Literature
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The magnetization reversal has been examined by the temperature dependence of the coercivity, the initial magnetization curve, minor hysteresis loops, and thermal activation in isotropic nanocrystalline Pr-Fe-B ribbons. The coercivity mechanism is found to vary with temperature. At 20 K, the coercivity is mainly deter…
1 H NMR T 2 relaxation has proved to be a successful technique for the study of rubber−filler interactions in carbon black filled rubbers. For the present study, the interactions between NR and pure silica as well as silicas grafted with various coupling agents were investigated using 1 H NMR T 2 relaxation. Monodispe…
A previous study of the desorption of straight-chain alkanes [H(CH 2 ) N H, N = 5−60] from the surface of graphite has revealed that the measured desorption barriers,, have a nonlinear dependence on the chain length (Paserba, K. R.; Gellman, A. J. Phys. Rev. Lett. 2001, 86 (19), 4338). A model is proposed for the mech…
Insoluble films of trisilanolisobutyl-POSS and octaisobutyl-POSS at the air/water interface are investigated by means of surface pressure - area per molecule isotherm (Pi - A) and Brewster angle microscopy (BAM). Analysis of the experimental results shows the partial cage molecule, trisilanolisobutyl-POSS, is a surfac…
Dimeric [Mn(salpn)NCS](2)(1) and polymeric [Mn(salpn)NCS](n)(2) are formed by the reaction of Mn(CH(3)CO(2))(2).4H(2)O, the schiff base, and thiocyanate. The formation of the two polymorphic forms is solvent and temperature dependent. 1: orthorhombic, space group Pbca, with a = 12.573(2) A, b = 13.970(7) A, c = 18.891…
The nature of the D band in the Raman spectrum of graphite has been the subject of considerable discussion. We examine the relationship between the depolarization characteristics of the D, ${D}^{\ensuremath{'}},$ and G fundamentals and their corresponding overtones and combinations on the basal and damaged edge planes…
Different ferrites (CoFe 2 O 4, ZnFe 2 O 4, MnFe 2 O 4 ) and magnetite were synthesized from corresponding salts exclusively inside poly(styrenesulfonate)/poly(allylamine hydrochloride) polyelectrolyte capsules of 10 μm diameter. Polyelectrolyte capsules with synthesized ferrite (magnetite) particles possess enough ma…
A series of rich premixed flames are used to realize a post-flame gas mixture for optimum carbon nanotube (CNT) growth using inexpensive hydrocarbon fuels. The mixture of CO, CO 2, H 2, and H 2 O is varied through use of hydrocarbon fuels with different H/C ratio in flames with different fuel/air ratios. Both SEM and…
Suspended bridges of individual multiwalled carbon nanotubes were fabricated inside a scanning electron microscope by soldering the nanotube onto microelectrodes with highly conducting gold−carbon material. By the decomposition of organometallic vapor with the electron beam, metal-containing solder bonds were formed a…
We calculate the quasiparticle band structure of ZnS and ZnSe using the plane-wave pseudopotential method and the GW approximation for the self-energy. The Zn semicore $3d$ states are treated as valence states. A systematic study of the role of various approximations is presented, including the local density approxima…
We investigate the phase behavior of a single-component system in three dimensions with spherically-symmetric, pairwise-additive, soft-core interactions with an attractive well at a long distance, a repulsive soft-core shoulder at an intermediate distance, and a hard-core repulsion at a short distance, similar to pote…
Surface anions on edges (4-coordinated = 4C) and on corners (3-coordinated = 3C) of cubic MgO nanoparticles exhibit UV resonance absorptions around 5.5 and 4.6 eV, respectively. After monochromatic excitation of either site the electron paramagnetic resonance (EPR) spectrum exhibits exclusively signal components relat…
A fourth generation hyperbranched polyester polyol based on bis-MPA and a PP50 core molecule (Boltorn H40) as well as its fractions obtained by preparative SEC were characterized with respect to composition, molar mass, and structure using NMR, SEC−MALS, ESI−MS, and DSC techniques. The content of dendritic units and t…
The full-potential augmented plane wave plus local orbital method within density-functional theory is used to predict that MnBi in the zinc-blende structure is a true half-metallic ferromagnet with a magnetic moment of $4.000{\ensuremath{\mu}}_{B}$ per formula unit. This contrasts with the zinc-blende phase of MnAs, w…
In recent years, the Preisach hysteresis model (1935) has emerged as the model of choice for the behaviour of many smart materials, such as shape memory alloys (SMA). This research treats the identification of Preisach models for a differential SMA actuator. The traditional identification technique is applied, and sev…
The symmetry breaking effects for quantum tunneling of the magnetization in Mn12-acetate, a molecular nanomagnet, represent an open problem. We present structural evidence that the disorder of the acetic acid of crystallization induces sizable distortion of the Mn(III) sites, giving rise to six different isomers. Four…
Control of particle-particle spacing is a key determinant of optical, electronic, and magnetic properties of nanocomposite materials. We have used poly(amidoamine) (PAMAM) dendrimers to assemble carboxylic acid-functionalized mixed monolayer protected clusters (MMPCs) through acid/base chemistry between the particle a…
Large scale molecular dynamics (MD) simulations are used to simulate the plastic deformation of a nanocrystalline model Ni sample with an average grain size of 5 nm containing 125 grains at 800 K up to 4.0% plastic strain. For the first time in MD simulation, emerging shear planes involving several grain boundaries ha…
Single-walled carbon nanotubes (SWNTs) can react with potassium hydroxide through a simple solid-phase mechanochemical reaction at room temperature to produce single-walled carbon nanotubols (SWNTols) − multiple hydroxyl groups direct-modified SWNTs. The SWNTols are highly soluble in water and can be readily self-asse…
The literature proposes some thermal models needed for the electrothermal simulation of power electronic systems. This paper gives a useful analysis about the choice of the thermal model circuit networks, equivalent to a discretisation of the heat equation by the finite difference method and the finite element method…