Nguyen Minh Tri

A Novel Framework of Ternary Fe3O4@γ-APTES@rGO Nanohybrid by [CH3OH]-Soluble Distribution for Synergistic Removal of 1,2,3-Benzotriazole

This study reports a novel ternary nanohybrid ([CH3OH]-F@γ-A@rG). Fe3O4 was core-shell coated with γ-APTES polymer (F@γ-A alloy) via in situ aminosilanization, then deposited on reduced graphene oxide (rG) through [CH3OH]-soluble distribution forming intermolecular interactions, to remove emerging organic chemicals as 1,2,3-benzotriazole (BTA). We newly found that ternary magnetic-polymer [CH3OH]-F@γ-A@rG possessed the regular sub-lattice active sites with a sole triangle of 60° in parallel adjacent interlayer of d111, d220, and d311 distances. While the key adsorption characteristics were not strongly affected by porous properties, the BTA adsorption was desired at elevated temperature and controlled by endothermic process. All adsorption data were satisfactorily fitted with the Langmuir isotherm and pseudo-second order kinetics. The maximum adsorption capacity of BTA was 312.5 mg·g-1 at neutral pH and 40 °C, which was great higher than other materials. CH3OH was the best liquid for efficient regeneration with 97% loss of BTA adsorption efficiency after five cycle times of [CH3OH]-F@γ-A@rG. The promoted BTA adsorption capacity was assigned to significant mechanisms including hydrophobic, electrostatic and π-π interactions between adsorbent-adsorbate.

Development of a novel linear magnetic actuator

The aim of this paper is to design, fabricate and control a novel Linear Magnetic Actuator (LMA) for applications such as active magnetic bearing systems to deal with vibration problems in rotating machines. This LMA actuator contains a moving body named ‘mover’ and three driving parts to drive the mover. Firstly, experiments have been conducted on the LMA to derive its mathematical model in order to investigate the generated electro-magnetic force as well as further research. The modeling result in a comparison with the actual system performance show that the electro-magnetic force varied symmetrically with the mover motion defined by the applied current. Secondly, an advanced trajectory controller named online tuning fuzzy PID controller has been designed for the LMA to improve the working performance. Finally, real-time experiments have been carried out to evaluate the tracking performance of the designed LMA control system. The results prove that the LMA driven by the proposed controller could track the desired trajectories with high accuracy.