In this work, a new methodology was developed to disperse nanofibrillated cellulose (CNF) in polylactic acid (PLA) composites for 3D printing. The nanofibres were modified by grafting PLA onto their surface through in-situ polymerisation of L-lactide. This modification changed subsequent fibre/PLA interaction and enabled the production reinforced microparticles Pickering emulsion approach. We d...

A class of interconnected systems with nonlinear interconnections and nonlinear disturbances is considered. A continuous nonlinear reduced-order compensator is established by exploiting the structure of the uncertainties. A sliding surface is proposed in an augmented space formed by the system output and the compensator variables, and the stability of the corresponding sliding mode is analysed....

We study in this paper the theory and applications of a nonlinear control technique, i.e., the so-called composite nonlinear feedback control, for a class of linear systems with actuator nonlinearities. It consists of a linear feedback law and a nonlinear feedback law without any switching element. The linear feedback part is designed to yield a closed-loop system with a small damping ratio for...

This work focuses on model predictive control of nonlinear singularly perturbed systems. A composite control system using multirate sampling (i.e., fast sampling of the fast state variables and slow sampling of the slow state variables) and consisting of a “fast” feedback controller that stabilizes the fast dynamics and a model predictive controller that stabilizes the slow dynamics and enforce...

In this paper, we consider a special class of underactuated mechanical systems with two degrees of freedom and symmetry. By symmetry, we mean the inertia matrix of the system is independent of the unactuated degree of freedom. We show that there exists a natural global change of coordinates obtained from the Lagrangian of the system that transforms the system into a partially linear cascade non...

This paper presents a strategy to convert hydrophilic cellulose nanofibrils (CNF) into highly cross-linked hydrophobic network with inorganic nanoparticles develop gel ink suitable for 3D printing. The CNF were chemically modified initially through single-electron transfer-living radical polymerization (SET-LRP) of stearyl acrylate (SA) in the presence surface-modified cobalt iron oxide (CoFe2O...

This study aims to investigate the microstructure and mechanical properties of Ti3SiC2-carbon nanofiber (CNF) composite materials by powder metallurgy (PM). Ti, SiC, graphite CNF powders were used produce Ti3SiC2-CNF materials. After formulated ground in a ball mill, milled pressed at 500 MPa pressure then sintered 1150 °C, 1300 °C 1450 °C. SEM-EDS XRD analysis examine phase formation. Hardness...

The development of new heterogeneous Pt-containing catalysts has retained its relevance over the past decades. present paper describes method to produce metal–carbon composites, Pt1?xNix/CNF, with an adjustable Pt/Ni ratio. composites represent Pt1?xNix (x = 0.0–1.0) nanoparticles embedded within a structure carbon nanofibers (CNF). synthesis is based on spontaneous disintegration alloys in eth...