Deep eutectic solvents for the production and application of new materials

Membrane-based separation for oily wastewater: A practical perspective.

Review on heavy metal adsorption processes by carbon nanotubes

Deep Eutectic Solvents

Material removal operations play a pivotal role in the manufacture of key components, required for engineering systems to operate safely and efficiently under ever more advanced functional requirements and over extended life cycles. To further step up the loading capability of machined parts, fundamental understanding of how of machining-induced features can influence the performance of advanced materials under complex service conditions is necessary over finer temporal and spatial scales. As discussed in Part I of this review, when engineering surfaces are generated by material removal processes, a wide range of physical mechanisms (e.g. mechanical, thermal, chemical and their combinations) drive the characteristics of workpiece surface integrity. In Part II of this review, the interplay between the metallurgical and micro-mechanical condition induced by material removal processes and their in-service response will be thoroughly explored, by a critical analysis of the state-of-the-art in the field. Specifically, attention is focused on recent advances made towards the understanding of the mechanisms determining the resistance of machined surface to fatigue crack nucleation (Section 2), corrosion and stress-corrosion cracking (Section 3), and wear (Section 4). Furthermore, the impact of relevant post-machining treatments on the in-service behaviour of machined surfaces is analysed, and the possible strategies for the enhancement of the functional performance of machined surfaces are presented (Section 5). Finally, the current research gaps and the prospective challenges in understanding the in-service behaviour of machined surfaces are critically discussed, providing an interpretation of the possible directions of future scientific development of this field.

Surface integrity in metal machining - Part II: Functional performance

In this work, novel zinc–graphene oxide (Zn–GO) composite coatings were successfully prepared by pulse electrodeposition in choline chloride (ChCl)/urea based deep eutectic solvent (DES). The GO sheets exhibited excellent dispersion stability in ChCl : 2urea DES without stabilizing additives and were uniformly deposited in the Zn matrix. The surface morphology and textured structure of the Zn–GO composite coatings were quite different from those of pure Zn coating, owing to the effects of GO on the electrochemical deposition behavior of Zn(II). The Zn–GO composite coatings showed higher stability and better corrosion resistance than the pure Zn coating and the corrosion resistance of Zn–GO composite coatings increased with the increase of the GO concentration.

Enhanced corrosion performance of Zn coating by incorporating graphene oxide electrodeposited from deep eutectic solvent

Superhydrophilic nickel-coated meshes with controllable pore size prepared by electrodeposition from deep eutectic solvent for efficient oil/water separation

Simultaneous Electropolishing and Electrodeposition of Aluminum in Ionic Liquid under Ambient Conditions

: This paper develops a continuous nonsingular terminal sliding mode controller (NTSMC) based on extended state observer (ESO) method for a DC-DC buck converter subject to both load disturbances and input voltage variations. First, a novel modeling method based on output feedback is developed to transform the matched and mismatched disturbances caused by load resistance and input voltage variations of the DC-DC buck converter into a uniform matched total disturbance. Second, a three-order ESO is established to estimate and compensate the differential of the output voltage and the total disturbance including the load disturbances and input voltage variation. Third, a nonsingular terminal sliding mode control based on the estimated values is designed to achieve faster tracking speed and better tracking accuracy around the expected voltage. In addition, the theoretical stability of the proposed controller is analyzed in detail by a Lyapunov stability criterion. Finally, both comparative simulation and experimental results show that the proposed NTSMC-ESO controller with the novel modeling method can attenuate the input voltage variation effectively and has a better load disturbance rejection ability than the conventional reduced-order ESO based sliding mode control method.

The impact of environmental investments on green innovation: An integration of factors that increase or decrease uncertainty

We have investigated the electropolishing (EP) of aluminum (Al) and its alloys in an ionic liquid composed of anhydrous aluminum chloride and trimethylamine hydrochloride. The EP mechanism of Al was investigated by linear sweep voltammetry. The optimum conditions for EP of Al and Al alloys including the ionic liquid components, current density and polishing time were systematically explored. Moreover, the microstructure and chemical compositions of Al before and after EP were measured by SEM, AFM, XPS and XRD, respectively. Compared to EP in strong acid solution, EP of Al in this ionic liquid can achieve the equivalent polishing effect with less mass loss. Importantly, the polishing ability of this ionic liquid remains stable even after EP for 50 cycles. The corrosion resistance of electropolished Al is drastically enhanced due to the formation of the compact passive layer on the mirror-like bright surface.

Electropolishing of Al and Al alloys in AlCl 3 /trimethylamine hydrochloride ionic liquid

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