Effect of Wood-Fiber Geometry Size on Mechanical Properties of Wood-Fiber from Neolamarckia Cadamba Species Reinforced Polypropylene Composites

Using natural wood-fiber as reinforcement in commercial thermoplastics is gaining momentum due to its high specific properties and renewable resources. In this study, the effect of wood particle geometry size on mechanical properties of thermoplastics composite was investigated. The wood species that has been chosen is Kelempayan species (Neolamarckia cadamba) and reinforced with polypropylene using fiber geometry size of 75 and 250 ?m. Thermoplastic composites were produced from two types of ratio (30:70 and 10:90) between wood-fiber and polypropylene. Static bending and tensile strength were tested. The result showed that wood-fiber from 75 ?m geometry sizes with ratio of 30:70 between wood-fiber and polypropylene was most suitable in producing thermoplastic composites. The geometry sizes of wood particle as well as the ratio between wood-fiber and polypropylene were found to influence the mechanical properties of the thermoplastic composites.

OPTICAL RESONANCES OF A PLASMA NATURE IN TWO-LAYER NANOSPHEROIDS

The process of light scattering by two-layer spheroids consisting of a dielectric core and a silver shell, which depends on the length of an incident wave and particle geometry, is considered. One optical resonance is observed when the foci of the nuclear surfaces and the shell coincide, while when this condition is violated, additional resonances appear. Namely, in the absorption and scattering bands, resonances were found, including previously unknown ones, the position and intensity of which depended on the shell thickness, the shape of the spheroid and its core. To substantiate the reliability of the results obtained, the convergence of the calculations was analyzed depending on the number of harmonics which were taken into consideration in the calculations.

Breakdown mechanisms of whey protein gels during dynamic in vitro gastric digestion

Particle geometry influenced the breakdown mechanisms impacting the pH, pepsin activity, and protein hydrolysis of whey protein gels during dynamic in vitro gastric digestion.

Universal motion of mirror-symmetric microparticles in confined Stokes flow

Comprehensive understanding of particle motion in microfluidic devices is essential to unlock additional technologies for shape-based separation and sorting of microparticles like microplastics, cells, and crystal polymorphs. Such particles interact hydrodynamically with confining surfaces, thus altering their trajectories. These hydrodynamic interactions are shape dependent and can be tuned to guide a particle along a specific path. We produce strongly confined particles with various shapes in a shallow microfluidic channel via stop flow lithography. Regardless of their exact shape, particles with a single mirror plane have identical modes of motion: in-plane rotation and cross-stream translation along a bell-shaped path. Each mode has a characteristic time, determined by particle geometry. Furthermore, each particle trajectory can be scaled by its respective characteristic times onto two master curves. We propose minimalistic relations linking these timescales to particle shape. Together these master curves yield a trajectory universal to particles with a single mirror plane.