Silver nanoparticles (Ag NPs) were synthesized by the chemical reducing method in the external and interlamellar space of montmorillonite (MMT) as a solid support at room temperature. AgNO(3) and NaBH(4) were used as a silver precursor and reducing agent, respectively. The most favorable experimental conditions for synthesizing Ag NPs in the MMT are described in terms of the initial concentrati...

The fish gill is the most physiologically diversified vertebrate organ, and its vasculature the most intricate. Application of vascular corrosion techniques that couple high-fidelity resins, such as methyl methacrylate, with scanning electron microscopy yields three-dimensional replicas of the microcirculation that have fostered a better appreciate gill perfusion pathways. This is the focus of ...

Pearlitic steels present very interesting mechanical properties when weldability requirements are not too severe. Thin gauge pearlitic steels require at least one intermediate annealing treatment between hot rolling and cold rolling. The globularised cementite in medium carbon steels provides then higher ductility, formability and machinability. On the other hand, in-line induction heating devi...

The goal of this paper is to analyse the effect of adding Al on the non-steady pearlite growth occurring in a Fe-C-Mn system. The results are discussed in terms of the partitioning of elements across the austenite/ferrite and austenite/cementite interfaces, and the modification of the pearlite driving force related to the change in carbon activity in austenite.

The cylinder liner is one of the important parts a diesel engine. Gray cast iron main material for manufacturing liners due to its good casting performance, convenient processing wear resistance and low cost. In present work, effects vanadium (V) tin (Sn) on microstructure properties gray were studied. Results show that increasing contents V Sn can not only refine graphite, but also reduce pear...

A mechanistic model for the micro-endmilling process is developed that explicitly accounts for the different phases while machining heterogeneous materials. It is shown that frequencies in the cutting force signal higher than those that can be explained by the kinematics of the process can be explained by considering the multiple phases in the material. Experiments are performed on two composit...

The developed model of diffusion‐limited and diffusionless solidification a eutectic alloy describes the relation “undercooling (Δ T )‐velocity ( V )‐interlamellar spacing (λ)” for two cases. Namely, when front velocity is smaller than solute diffusion speed in bulk liquid D , < predicts regime similarly to known classical models. If higher speed, > mainly controlled by kinetic thermal un...

The article presents the results of analysis evolution defective substructure rail steel pearlite with lamellar morphology under deformation by uniaxial compression. strain hardening studied such has a multistage character. Deformation is accompanied fragmentation grains, which intensifies as degree increases and reaches 0.4 foil volume at ε = 50 %. Fragments formed in ferrite plates are separa...

We confirm with high-resolution techniques the existence of mineral bridges between superposed nacre tablets. In the towered nacre of both gastropods and the cephalopod Nautilus there are large bridges aligned along the tower axes, corresponding to gaps (150-200 nm) in the interlamellar membranes. Gaps are produced by the interaction of the nascent tablets with a surface membrane that covers th...