Materials Literature
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In the last decades, the run-up in both the fossil fuel prices and the related global warming turned the attention towards environmentally clean alternative energy resources. Among them, solar photovoltaics is a reliable choice to tackle the strong increase of the global energy demand. The development of low cost and…
We report the interfacial assembly of amphiphilic heteroarm star copolymers (PSnP2VPn and PSn(P2VP-b-PtBA)n (n = 28 arms)) on graphene oxide flakes at the air-water interface. Adsorption, spreading, and ordering of star polymer micelles on the surface of the basal plane and edge of monolayer graphene oxide sheets were…
In situ scanning tunneling microscopy observations of graphene formation on Rh(111) show that the moiré pattern between the lattices of the overlayer and substrate has a decisive influence on the growth. The process is modulated in the large unit cells of the moiré pattern. We distinguish two steps: the addition of a…
In natural systems, highly synergistic non-covalent interactions among biomolecular components exert mesoscopic control over hierarchical assemblies. We herein present a multicomponent self-assembly strategy to tune hierarchical supramolecular polymer architectures in water using highly affine and directional ureidopy…
The structure of chalcogenide glassy semiconductors in three-component systems of Ge-As-Se and As-Sb-Se has been studied by means of both NQR and EPR spectroscopy. Investigation of mutual local coordination of atoms has been performed. The results are presented for various ways of combining structural units to provide…
Electric double layer capacitors (or supercapacitors) store charges through the physisorption of electrolyte ions onto porous carbon electrodes. The control over structure and morphology of carbon electrode materials is therefore an effective strategy to render them high surface area and efficient paths for ion diffus…
We have developed a new method for determining oxygen nonstoichiometry (3 − δ) as a continuous function of oxygen partial pressure $$\left( {p_{O_2 } } \right)$$ at high temperatures in mixed ionic-electronic conducting oxides. A proposed mathematical model allowed us to assess the contribution of the oxygen released…
We have prepared ceramic samples of solid solutions based on Bi-containing perovskite-like oxides near the morphotropic phase boundary in the K 0.5 Na 0.5 NbO 3 -BiScO 3 -AgSbO 3 system and modified with LiF and MnO 2 additions; investigated the phase relations, structure, and dielectric and ferroelectric properties o…
Hydride phases based on the intermetallic compounds LaNi 5 , CeCo 3 , NdNi 3 , GdFe 3 , DyCo 3 , and ErNi 3 have been synthesized at a hydrogen pressure of 10 MPa and a temperature of 273 K. The phase composition of the synthesized materials and the lattice parameters of the hydride phases have been determined by X-ra…
Red-emitting Ca 3- x Eu x ZrSi 2 O 9 (0.05 ≤ x ≤ 0.30) single phase phosphors were synthesized using the conventional solid-state reaction method and their photoluminescence properties were characterized. These phosphors exhibited typical emission peaks assigned to the transition from 5 D 0 to 7 F J ( J = 0, 1, 2, 3,…
The block copolymerization of 4,4′-vinylphenyl-N,N-bis(4-tert-butylphenyl)benzenamine (A) with 2-(2-(4-vinylphenyl)ethynyl)pyridine (B) was performed using sec-butyllithium (s-BuLi) as an initiator in the absence and presence of potassium tert-butoxide (KOBut) in tetrahydrofuran (THF) at −78 °C. The block copolymeriza…
Using X-ray diffraction and scanning electron microscopy, we have studied general aspects of defect structure formation in thermoelectric materials in different stages of plastic flow in the equal-channel angular pressing process with three channels. The results demonstrate that materials prepared using this deformati…
O presente trabalho objetivou avaliar as características físico mecânicas de chapas aglomeradas com partículas de leucena (Leucaena leucocephala) e resina poliuretana derivada de óleo de mamona, sendo investigados o módulo de resistência à flexão (MOR), adesão interna (AI), densidade aparente (d ap) e teor de umidade…
ABSTRACT Dynamically vulcanized thermoplastic polyurethane (TPU)/millable polyurethane (MPU) blend nanocomposites, simple TPU/MPU blend nanocomposite, and TPU nanocomposite with 3 parts per hundred (phr) of organoclay were melt compounded in an internal mixer. Interfacial interactions between the organoclay and polyur…
This paper reports the high-temperature synthesis of cast Cr2AlC from mixtures of chromium(III) oxide, chromium(VI) oxide, aluminum, and carbon at an increased inert gas (Ar or N) pressure in a 3-L self-propagating high-temperature synthesis reactor at an initial argon pressure p i = 5 MPa. The reaction products were…
We have prepared Ca9.5 − x Pb x M(PO4)7 (M = Mg, Zn, Cd) and Ca10.5 − x Pb x (PO4)7 solid solutions. A polar whitlockite-like (sp. gr. R3c) crystal structure exists in the range 0 ≤ x ≤ 1.5 for all of the M cations in Ca9.5 − x Pb x M(PO4)7 and in the range 0 ≤ x ≤ 2.5 for Ca10.5 − x Pb x (PO4)7. X-ray powder diffract…
The presence of Stone-Wales defects in single-walled carbon nanotubes (SWNTs) not only leads to new interesting properties, but also provides opportunities for tailoring physical and chemical properties, and expands their novel potential applications. With a two-layered ONIOM method, 1,3-dipolar cycloadditions (1,3-DC…
Zn1−xFexO (x = 0.02, 0.04, 0.06, 0.08, 0.10) powders have been synthesized by sol–gel approach from Zn nitrate and Fe nitrate reduced by citrate. Their structural and optical properties have been investigated by X-ray diffraction (XRD), Raman spectra and photoluminescence (PL), respectively. XRD shows that Zn1−xFexO s…
This paper presents an experimental program to investigate the impact and penetration resistance of concrete. The research work is divided into two approaches. These approaches are effect of concrete constituents and effect of surface layer. Effect of concrete aggregate type, w/c ratio, fiber type, fiber shape, fiber…
In this work, green composites from renewable resources were manufactured and characterized. A fibrous material derived from Posidonia oceanica wastes with high cellulose content (close to 90 wt% of the total organic component) was used as reinforcing material. The polymeric matrix to bind the fibers was a protein (wh…