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The sol-gel method was used to prepare the high purity lead zirconate titanate Pb(Zr,Ti)O3 (PZT) piezoelectric ceramic powders. To determine the optimum fabrication process, the influence of calcined conditions and sintering conditions on the characteristics of PZT bulk was studied. After calcined at 900°C for 4hr, and then sintered at 1100°C for 2hr, the density of the bulk ceramics nearly equal...
This paper provides a PTFE/LSEG solid self-lubricating composite that exhibits very low friction coefficient and wear rate. In present study, the influences of the content of expanded graphite with nanoscale lamellar-structure (LSEG) in PTFE/LSEG composite on tribological properties were carried out. Six compounds of PTFE with LSEG (0-30 wt. %) were evaluated on MMU-5G friction and wear tester. The...
This paper reports a fabrication method for producing piezoelectric poly (vinylidene fluoride) films in their electroactive β-phase that features controlled thickness, smooth and flat surface, and high transparency. These piezoelectric films are suitable for being used as integrated microactuators, such as piezoelectric pumps and/or mixers, in microfluidic applications. Their actuation circuit design...
High dispersion of nanoparticles in transparent polymer matrices is the prerequisite to maintain the transparency of matrices. However, it is hard to fabricate the nancomposites with high visible light transmittance even at low nanoparticle concentrations. In this work, highly transparent Polyvinyl Butyral (PVB)/ZnO nanocomposites were fabricated by using the two-step process. Firstly, the monodispersed...
This work shows results from the application of an optical sensor based on fibre Bragg grating to monitor the drying of paints. The drying time of the latex paint film was monitored along 370 minutes by an encapsulated fibre Bragg grating employed as transducer device for the mechanical forces inherent to the process. Along the drying, the paint film changed from a sticky liquid state to a solid state...
The slow drying of the photoactive layer in polymer/ZnO nanorod hybrid solar cells is studied as a way to improve device performance. The power conversion efficiency can be further improved to 3.05% with an enhanced fill factor of 55% by slowing the spin coating rate of photoactive layer. With the slower spin coating rate, the films of photoactive layer are thicker, and the polymer chains have longer...
Consolidation mechanisms for colloidal suspensions are currently inadequately characterized due to lack of suitable experimental techniques. We contributed to this question by combining ultrasonic and optical measurements. White light specular and diffuse reflection measurements provided information about colloidal film formation, i.e. the stage of drying and its structure while a concurrent ultrasound...
Nano-sized powders of transparent conductive aluminum-doped zinc oxide (AZO) have been successfully prepared by electrolysis-modified co-precipitation method. By adding ammonium hydroxide into the precursor solution prepared by electrolytic dissolution of zinc metal in a buffered electrolyte solution of nitric acid and ammonium nitrate with adequate addition of aluminum nitrate, co-precipitate precursors...
Iron encapsulated carbon nanoparticle - polyvinyl chloride composite films have been prepared by solvent mixing and drying method. The films were characterized by scanning electron microscope (SEM) and high resolution transmission electron microscope (HRTEM). A 5 nm thin graphitic carbon coating is observed on cubic Fe nanoparticles. The microwave absorption studies by wave guide technique in the...
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