Materials Literature
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We developed a theory for the statistical mechanics of nanoparticles doped in ferroelectric liquid crystals (FLC). The presence of nanoparticles in FLC medium creates strong local fields that produce large alignment effects over the distribution of the nanosuspensions. Considering these local field effects, we present…
Abstract Ecological concerns over the accumulation of polymeric waste material and the demand for functionalized polymers in specialty applications have promoted extensive research on different controlled degradation processes and their use. The production of functionalized or modified polymers by conventional synthet…
The properties of injection-moulded polylactic acid (PLA) and recycled carbon fibre composites are examined in this study. Measurement of tensile, flexural, and impact resistance properties quantify the mechanical properties of the composites with increased fibre loading. Tensile strength and modulus of PLA and 30 wt%…
We present a simulation study of argon adsorption in a closed-end mesopore of uniform diameter in order to investigate the occurrence of hysteresis and propose two principal reasons for its existence: the variation in the shape and radius of curvature of the meniscus and the change in the packing of adsorbate during a…
Natural flaky graphite in Shandong, China was purified by H 2 O 2 , a new patent method to produce graphite without sulfur and used as precursor to prepare exfoliated graphite through microwave irradiated expansion with some chemicals (such as hydrogen peroxide, nitric acid, and acetic acid). With the centrifugation p…
A sublimation method based on the use of a conventional vacuum oven has been developed to extend the method’s range of applications. The use of a small, externally controlled heater has increased the temperature range from 80–200 to 80–500 °C and provides high-quality crystals of compounds ranging from oxalic acid to…
The use of chemithermomechanical (CTMP) pulp from rapeseed residues as raw material for the manufacturing of linerboard and fluting medium grades was investigated. For this purpose, different alternatives for improving mechanical and optical properties of rapeseed CTMP were studied, and the addition of nanofibrillated…
Abstract In this work, we used two techniques to study the deformation‐induced whitening phenomenon that occurs when certain semicrystalline polymers (SCPs) are subjected to tensile drawing: (1) IPLST (Incoherent Polarized Steady Light Transport) was used for characterizing the light scatterers and in particular for d…
Ferroelectric characterization of aligned barium titanate nanofibres, Sá, Pedro, Barbosa, Jose, Bdikin, Igor, Almeida, Bernardo, Rolo, Anabela G, Gomes, Etelvina de Matos, Belsley, Michael, Kholkin, Andrei L, Isakov, Dmitry
The BT / NZFO composite ceramics derived by sol–gel in situ process were successfully prepared. The phase composition, morphology, and microstructure of the composite ceramics were determined and observed by X‐ray diffractometer ( XRD ), SEM , and EDS . Results showed that the Ni–Zn ferrite ( NZFO ) phase started to g…
When a second-order magnetic phase transition is tuned to zero temperature by a nonthermal parameter, quantum fluctuations are critically enhanced, often leading to the emergence of unconventional superconductivity. In these "quantum critical" superconductors it has been widely reported that the normal-state propertie…
AIM: Different nanoparticles have been investigated to deliver chemotherapeutic agents, but complex synthesis procedures and biocompatibility issues raise concerns in developing them for safe human usage. The aim of this work is to develop α,β-dehydrophenylalanine-containing, self-assembled, amphipathic dipeptide nano…
Abstract For nearly the past two decades, significant effort has been devoted to pursuing an understanding of the glass transition temperature and associated dynamics of polymers confined to the nanoscale. Without question, we know more about the glassy properties of confined polymers today than we knew two decades ag…
This study was conducted to evaluate suitability of luffa (Luffa cylindrica) fiber for medium density fiberboard (MDF) production. For the experiment, luffa and commercially manufactured fibers (Pinus sylvestris (30%), Fagus orientalis Lipsky (35%) and Quercus robur L. (35%)) with 11% moisture content were used. Luffa…
Hypericin is a photosensitizer with promising applications in photodynamic therapy (PDT) for cancer and infectious diseases treatments. Herein, we present a basic research study of L-diphenylalanine micro/nanotubes (FF-NTs) functionalized with hypericin. The system has special properties according to the hypericin con…
Ans Licht gebracht: Pyrimidin-Nucleoside mit kovalent verankerten 2-[2-Methyl-5-phenylthien-3-yl]cyclopent-1-en-Resten gehen bei der Bestrahlung mit Licht einen schnellen und reversiblen Ringschluss ein (siehe Schema). Eine konvergente Synthese über eine Suzuki-Miyaura-Kreuzkupplung in wässriger Phase führt in einer S…
The absorption line shapes of a series of linear and star-shaped perylene diimide (PDI) complexes are evaluated theoretically and compared to experiment. The cyclic trimer and tetrahedral complexes are part of the symmetric series, characterized by a single interchromophoric coupling, J(0), between any two PDI chromop…
Abstract In Portugal, most end‐of‐life tires are recycled through a process involving a cryogenic grinding technology. The purpose of this work was to envisage new applications for recycling rubber from end‐of‐life tires. In this work, rubber was supported in a polyurethane matrix generating two new products of distin…
Phase retardation of both extraordinary and ordinary polarized rays passing through a liquid crystal (LC) cell with homogeneous and inhomogeneous LC director distribution is calculated as a function of the LC pretilt angle θ₀ on the cell substrates in the range 0 ≤ θ₀ ≤ 90°. The LC pretilt on both substrates can have…
Currently, the majority of metal-oxide surge arrester (MOSA) monitoring techniques are based on total leakage current decomposition of their capacitive and resistive components. However, these techniques are subject to some financial, technical, and practical limitations, which can hamper their usage on the field. In…