Materials Literature
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Metal atoms on graphene, when ionized, can act as a point-charge impurity to probe a charge response of graphene with the Dirac cone band structure. To understand the microscopic physics of the metal-atom-induced charge and spin polarization in graphene, we present scanning tunneling spectroscopy (STS) simulations bas…
In dealing with thermal transport in composite systems, high contrast materials pose a special problem for numerical simulation: the time scale or step size in the high conductivity material must be much smaller than in the low conductivity material. In the limit that the higher conductivity inclusion can be treated a…
We report on the microscopic model of the recently synthesized one-dimensional quantum magnet (NO)Cu(NO3)3. Applying density functional theory band structure calculations, we obtain a leading antiferromagnetic exchange coupling J ~ 200 K, which runs via NO3 groups forming spin chains along the b direction. Much weaker…
We have measured the frequency-dependent, complex impedance of thin metal strips in a broad range of microwave frequencies (45~MHz to 20~GHz). The spectra are in good agreement with theoretical predictions of an RCL model. The resistance, inductance, and capacitance, which govern the microwave response, depend on the…
It is demonstrated based on continuum mechanics modeling and simulation that it is possible to obtain polycrystalline ceramic ferroelectric materials which beggars single crystals in electromechanical properties. The local inhomogeneities at the ferroelectric domain-scale level due to spontaneous polarization and the…
In this overview paper the trends in the modern literature concerning the characterization of linear electromagnetic properties of nanostructured metamaterials are briefly discussed. Electromagnetic characterization of bulk and surface metamaterials is discussed. The problem of characterization of metamaterials with s…
Micro- and nanoparticles with high-index facets may exhibit higher chemical activities that are of great importance in practical applications. Cuprite is a potential alternative to expensive noble metals as the catalyst for CO oxidation at moderate temperatures. We report here a solution based approach to the preparat…
Electronic energy transfer (EET) has been the subject of intense research because of its significant contribution to the photophysical properties of various material systems. For π-conjugated polymers, it has long been accepted that a classical hopping mechanism is dominant in the energy transfer dynamics because of a…
Cellulose nanocrystals (CNCs) prepared by H(2)SO(4) hydrolysis have sulfate groups on their surface, which have negative implications for some CNC applications. In this study, two desulfation methods were evaluated, and the properties of desulfated CNCs were compared to those of unsulfated CNCs, prepared by HCl hydrol…
The energetic span model allows the estimation of the turnover frequency (TOF) of a catalytic reaction from its calculated energy profile. Furthermore, by identifying the TOF determining intermediate and the TOF determining transition state, the model shows that the concept of "determining states" is more useful and c…
Precise tuning of surface wettability – by means of curvature-driven reversible switching from the pinned to the roll-down superhydrophobic state (see figure) – is reported for for the first time. The adhesion force and sliding behaviors of superhydrophobic poly(dimethylsiloxane) (PDMS) pillar arrays show strong depen…
Graphene is a fascinating material not only for technological applications, but also as a test bed for fundamental insights into condensed matter physics due to its unique two-dimensional structure. One of the most intriguing issues is the understanding of the properties of graphene and various substrate materials. In…
We experimentally demonstrate over 2 orders of magnitude increase in the room-temperature coherence time of nitrogen-vacancy centers in diamond by implementing decoupling techniques. We show that equal pulse spacing decoupling performs just as well as nonperiodic Uhrig decoupling and also allows us to take advantage o…
We have studied magnetization of graphene nanocrystals obtained by sonic exfoliation of graphite. No ferromagnetism is detected at any temperature down to 2 K. Neither do we find strong paramagnetism expected due to the massive amount of edge defects. Rather, graphene is strongly diamagnetic, similar to graphite. Our…
Lead-free perovskite Ba(Pr1/2Ta1/2)O3 was prepared by conventional ceramic fabrication technique at 1350°C/5hr in air atmosphere. The crystal symmetry, space group and unit cell dimensions were determined from the XRD-data using FullProf software. XRD analysis of the compound indicated the formation of a single-phase…
An elastic-viscoplastic constitutive mode was adopted to analyze asymptotically the tip field of a mode I quasi-statically propagating crack in rate-sensitive materials under plane stress condition. Under the assumption that the viscosity coefficient is a power law function of the rate of effective plastic strain, it…
High power piezoelectric characteristics of perovskite-type lead-free ferroelectric ceramics, 0.88(Bi0.5Na0.5) TiO3-0.04(Bi0.5Li0.5)TiO3-0.08(Bi0.5Na0.5)TiO3 + MnCO3 0.4 wt% [BNLKT4-8Mn0.4] and KNbO3 + MnCO3 0.8 wt% [KN-Mn0.8], were focused on under large-amplitude vibration as compared with those of Pb(Zr,Ti)O3 [PZT]…
1D tubes of ZnS were prepared by microwave irradiation process. The X-RD pattern indicated that as-prepared sample was hexagonal ZnS structure with cell constant a = 3.5277 A° and c = 5.79 A°. SEM observed the tubes-like structure having the length ranging from 10–20 μm with the average diameter of 5 μm and wall thick…
The temperature and frequency dependent dielectric and conductivity properties were measured on as-sintered as well as oxygen annealed KNbO3 ceramics. The results show that in addition to phase transition peaks, well defined relaxation peaks are observed in the temperature range 450–700 K. These peaks could be suppres…
Through its extensive use as an oxygenate fuel, methyl tert-butyl ether (MTBE) is found nearly ubiquitous in the environment. MTBE, a widely used gasoline additive, is recently being scrutinized for potential environmental damage for groundwater and in the atmosphere. Single-walled carbon nanotubes (SWNTs) are designe…