Materials Literature
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The triple “magnetic−transport−structural” transition versus temperature in three series of “114” cobaltites, Y 1− x Yb x BaCo 4 O 7, Y 1− x Ca x BaCo 4 O 7, and Yb 1− x Ca x BaCo 4 O 7, has been studied using magnetic, transport, and differential scanning calorimetric measurements. The effect of the size mismatch σ 2…
The observation of isolated positive and negative charges, but not isolated magnetic north and south poles, is an old puzzle. Instead, evidence of effective magnetic monopoles has been found in the abstract momentum space. Apart from Hall-related effects, few observable consequences of these abstract monopoles are kno…
The novel aspect of the centre (NV-) in diamond is the high degree of spin polarisation achieved through optical illumination. In this paper it is shown that the spin polarisation occurs as a consequence of an electron-vibration interaction combined with spin-orbit interaction, and an electronic model involving these…
We present an implementation of the GW approximation for the electronic self-energy within the full-potential linearized augmented-plane-wave (FLAPW) method. The algorithm uses an all-electron mixed product basis for the representation of response matrices and related quantities. This basis is derived from the FLAPW b…
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…
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…
Analysis of the molecular speciation of organic compounds in solution is essential for the \nunderstanding of ionic complexation. The Raman spectroscopic technique was chosen for \nthis purpose because it allows the identification of compounds in different states and it \ncan give information about the molecular geome…
El tratamiento superficial de aleaciones médicas de CoCr L605 mediante implantación iónica por inmersión en plasma de nitrógeno (PIII) produce una capa superficial dura y resistente al desgaste, compuesta de nitrógeno en solución sólida. Sin embargo, un estudio detallado de las propiedades de corrosión mediante polari…
El tratamiento superficial de aleaciones médicas de CoCr L605 mediante implantación iónica por inmersión en plasma de nitrógeno (PIII) produce una capa superficial dura y resistente al desgaste, compuesta de nitrógeno en solución sólida. Sin embargo, un estudio detallado de las propiedades de corrosión mediante polari…
Este estudo tem como objetivo a modificação da superfície de revestimentos poliméricos utilizando plasma, com o intuito de se criar materiais com superfícies resistentes a corrosão química e com baixa energia de superfície. Além disso, durante o trabalho foram estudadas diferentes maneiras de se viabilizar a aplicação…