Materials Literature
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Abstract Processing conditions and final mechanical properties of polymer nanocomposites are affected by their interfacial layers behavior. However, it is impossible to determine directly the properties of these layers by dynamic rheometry tests. In this work, the interfacial layers properties are evaluated for polyst…
Plasmid-encoded R67 dihydrofolate reductase (DHFR) catalyzes a hydride transfer reaction between substrate dihydrofolate (DHF) and its cofactor, nicotinamide adenine dinucleotide phosphate (NADPH). R67 DHFR is a homotetramer that exhibits numerous characteristics of a primitive enzyme, including promiscuity in binding…
Abstract The screened exchange (SX) density functional is a hybrid density functional which has been developed to improve the description of the band gaps of semiconductors and insulators in the local density approximation. It is accurate enough to reduce the band gap error to 7%, and efficient enough to be used varia…
Ultraviolet radiation was used as a photochemical initiator to synthesize ethylene glycol dimethacrylate-methyl methacrylate copolymers. Infrared spectroscopy was used to calculate reactivity ratios and to identify the type of copolymerization. The reactivity ratios of EGDMA and MMA were calculated as 0.6993 and 1.863…
Our work investigates the precipitation mechanism of a seeded calcium carbonate reaction, by using cryogenic TEM to observe the early stages of the reaction. The early precipitation of a hydrated phase is proposed as an intermediate phase before transformation into calcite. Thermodynamic modeling in conjunction with p…
We measured the electronic structure of an iron arsenic parent compound LaFeAsO using angle-resolved photoemission spectroscopy (ARPES). By comparing with a full-potential linear augmented plane wave calculation we show that the extra large $\ensuremath{\Gamma}$ hole pocket measured via ARPES comes from electronic str…
The interaction of single-walled carbon nanotubes (SWCNTs) and α-sexithiophene (6T) was studied by Raman spectroscopy and by in situ Raman spectroelectrochemistry. The encapsulation of 6T in SWCNT and its interaction causes a bleaching of its photoluminescence, and also small shifts of its Raman bands. The Raman featu…
Abstract This study is aiming at the production of carbon material from agricultural residues by pyrolysis and their further use for the production of green polymeric composites. The development of an agricultural‐based polymer matrix compatible with olive pits and consequently a fully biodegradable composite system i…
Licht steuert Größe: Eine neue Art selbstorganisierter supramolekularer Nanopartikel reagiert auf UV-Bestrahlung mit einer Größenänderung (siehe Bild). Das doppelt-responsive System vereint eine lichtsteuerbare Größe mit pH-induziertem Schalten zwischen nanoskaligen Aggregaten und molekularen Baueinheiten. Das Konzept…
Nanotechnology exploits the fact that nanoparticles exhibit unique physicochemical properties, which are distinct from fine-sized particles of the same composition. It follows that nanoparticles may also express distinct bioactivity and unique interactions with biological systems. Therefore, it is essential to assess…
Synchrotron-based X-ray photoemission electron microscopy (X-PEEM) and atomic force microscopy (AFM) were used to characterize the composition and surface morphology of thin films of a polystyrene-poly(ethylene oxide) blend (PS-PEO), spun cast from dichloromethane at various mass ratios and polymer concentrations. X-P…
Solid oxide fuel cells (SOFCs) consist of ceramic materials. Because of the brittle nature of ceramics, durability decrease of a SOFC system or mechanical failure of cells can be caused by transient behavior, that is, sudden temperature variation and axial temperature gradient. Therefore, it is important to understand…
Abstract To reduce the ZnO levels in rubber compounds, mixed metal oxide nanoparticles of zinc and magnesium (Zn 1− x Mg x O) have been synthesized and used as activator. The aim is to obtain better curing properties due to its nanosize and to take advantage of the behavior of both ZnO and MgO in sulfur vulcanization.…
Abstract Functionalization of multi‐walled carbon nanotubes (MWCNTs) influences physico‐mechanical properties of MWCNT/epoxy composites. Samples based on epoxy resin (EP) and different weight percentage of MWCNTs (functionalized and non‐functionalized) were prepared. Epoxy/carbon nanotubes were prepared by different m…
Hydrodynamic models are generally applied to describe the dynamic wetting of newtonian or non-newtonian fluids on a solid surface. Conversely, the molecular-kinetic paradigm is only utilized for spreading newtonian fluids while considering the movement of a contact line as a molecular hopping process. This study exten…
Zirconium oxide cluster anions Zr(x)O(y)(-) are prepared by laser ablation and are reacted with n-butane in a fast flow reactor under near room temperature conditions. A time-of-flight mass spectrometer is used to detect the cluster distribution before and after the reactions. Observation of a hydrogen atom pickup pro…
Abstract A series of segmented poly(urethane‐urea) polymers have been synthesized varying the hard segments content, based on the combination of polycaprolactone diol and aliphatic diisocyanate (Bis(4‐isocyanatocyclohexyl)methane), using diamine (1,4‐Butylenediamine) as the chain extender. The microstructure and prope…
Abstract Gelatin was extracted from chrome tanned leather waste with the aim to produce a durable coating or film. Crosslinking has shown to improve the physical performance of a film/coating. The effect of the method of crosslinking and the use of different crosslinking agents were studied. The extracted gelatin was…
Sensing technologies based on metallic nanoparticles, known as Ag, Au, and so on, have raised enormous interest for their extraordinary sensing resolution and sensitivity to analytes of chemical or biological importance under optical detection have received wide attention in recent decades. Currently, a discrete nanop…
DegS is a periplasmic Escherichia coli protease, which functions as a trimer to catalyze the initial rate-limiting step in a proteolytic cascade that ultimately activates transcription of stress response genes in the cytoplasm. Each DegS subunit consists of a protease domain and a PDZ domain. During protein folding st…