Materials Literature
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Targeted cancer therapy: Inspired by the ability of DNA hybridization, a targeted near-infrared (NIR) light-responsive delivery system has been developed through simple DNA self-assembly (see picture; PEG=polyethylene glycol). This DNA-based platform shows the ability of releasing therapeutics upon near-infrared irrad…
This review describes state-of-the-art scientific and technological developments of electrospun nanofibers and their use in self-cleaning membranes, responsive smart materials, and other related applications. Superhydrophobic self-cleaning, also called the lotus effect, utilizes the right combinations of surface chemi…
Periodic Mesoporous Organosilicas (PMOs) were developed in 1999 and are basically ordered templated mesoporous organosilicas, prepared by the combination of a surfactant as template and a silsesquioxane as the organosilica precursor. They were one of the first examples of the so-called "hybrid" organic/inorganic mater…
Abstract Thermoelectric materials can convert waste heat into electricity, potentially improving the efficiency of energy usage in both industry and everyday life. Unfortunately, known good thermoelectric materials often are comprised of elements that are in low abundance and require careful doping and complex synthes…
Deformation-tolerant devices are vital for the development of high-tech electronics of unconventional forms. In this study, a highly compressible supercapacitor has been fabricated by using newly developed polypyrrole-mediated graphene foam as electrode. The assembled supercapacitor performs based on the unique and ro…
A one-dimensional phenomenological approach to simulate both the mechanical and functional properties in shape memory alloys (SMAs) is described in the following sections. In fact, shape-memory alloys exhibit unique mechanical and functional features, due to reversible transformations in crystal structure. In particul…
Abstract A detailed understanding of graphene properties both in its neutral and doped states is an important prerequisite for applications of this new material in electronic devices. We used electrochemical doping to study the influence of charge on isotopically labeled two‐layer graphene. No change of the G mode int…
The purpose of this research is to characterize the in vitro cellular effects of rat lung macrophages to exposure to aluminum oxide nanoparticles (Al2O3-NP) (30 and 40nm) compared to aluminum nanoparticles (Al-NP) (50, 80, and 120nm). This study concentrates on cell viability, mitochondrial function, phagocytosis abil…
The increase of industrial activities and intensive use of chemical substances such as petroleum oil, polycyclic aromatic hydrocarbons, BTEX (benzene, toluene, ethylbenzene and xylenes), chlorinated hydrocarbons as polychlorinated biphenyls, trichloroethylene and perchloroethylene, pesticides, dyes, dioxines and heavy…
We present the performances of a polycrystalline diamond detector with surface graphite electrodes when irradiated by a beta source. The results are compared with those obtained with a similar diamond detector equipped with standard Ti-Au electrodes. Both the test apparatus for signal acquisition and the laser system…
Effects of rapid thermal annealing (RTA) and dual compression-pulse-laser sintering (compression-PLS) on photovoltaic, CdTe nanowire (NW) and quantum dot (QD) films are investigated. Unlike regular furnace annealing, RTA involves raising the temperature of a substrate’s atmosphere by several hundred degrees in a matte…
In the actuation field, the most common shape memory alloy is quasi-equiatomic NiTi system, commercially known as Nitinol®. Ti-rich NiTi compounds show characteristic transformation temperatures higher than the room one and they can recover high values of deformation. Moreover, these intermetallic compounds are widely…
A novel colorimetric pH indicator based on a pyrene–spiropyran (SP) conjugate (1) was designed and synthesised. The acidic-sensing property of 1 was investigated by UV–vis absorption spectra, which showed a low pH-dependent (2.0–5.5) reversible equilibrium between colourless SP form (1) and brown-yellow merocynine for…
Existence and properties of the Shapiro steps in the presence of noise have been studied in the ac driven overdamped Frenkel-Kontorova model with deformable substrate potential. The results have shown that the influence of noise on interference phenomena is determined by the presence and the size of half-integer steps…
The structural materials of reprocessing and waste management plants are made from AISI Type 304L (UNS S30403) grade austenitic stainless steels and are prone to localized corrosion attack like intergranular corrosion (IGC). It is very important to detect and characterize this attack non-destructively. An ultrasonic-b…
The precipitation behavior of secondary phases and its effects on the localized corrosion of SR50A super austenitic stainless steel were investigated. Chi phase began to precipitate after aging for 1 h at 700°C and 20 min at 800°C ~ 900°C, and sigma phase appeared after 10 h at 700°C, 1 h at 800°C, and 20 min at 900°C…
Recent experimental tests showed that shape memory alloys have a strong dependence of stress–strain curve on the strain rate. This rate-dependent phenomenon is mainly due to the temperature variation of shape memory alloys caused by the latent heat release/absorption during the forward/reverse phase transformation. Si…
Abstract Tunable biodegradable polyurethanes (PUs) with favorable mechanical properties were synthesized from 1,6‐hexamelthylene diisocyanate (HDI) as the hard segment, poly(ϵ‐caprolactone) (PCL) as the soft segment, and L ‐cystine ester as chain extender. The structure of PUs was confirmed by FTIR and 1 H‐NMR. The re…
Semiconductor quantum dots (QDs) have been called artificial atoms because of their discrete electronic structures. Assembling them into artificial molecules may greatly expand our capability in controlling physical properties on the nanoscale. Here we show the successful assembly and size control of colloidal PbSe QD…
Hydroxyapatite (HAp) particles, a potential starting material for bone substitutes, with nanopores were synthesized in the presence of cetyltrimethylammonium bromide (CTAB) and P123 as cationic and nonionic surfactants as the structuring units. Effect of nonionic surfactant concentration on surface areas is also inves…