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Controlling colloidal processing of (K,Na)NbO3-based materials in aqueous medium
摘要： K0.5Na0.5NbO3-based materials are serious candidates to replace lead-based piezoceramics since they show excellent electrical and piezoelectric properties. The tape casting technique can be used to obtain highly textured KNN-based ceramics; however, despite industrial and environmental advantages of water-based processing, there are not reports about the control of colloidal processing conditions to obtain optimized K0.5Na0.5NbO3-based slurries in aqueous medium. This paper reports a procedure for controlling colloidal processing conditions to obtain optimized (K0.5Na0.5)0.97Li0.03Nb0.8Ta0.2O3 suspensions. Zeta potential and cationic solubility measurements as a function of pH showed that pH 8.5 is adequate for controlling colloidal stability and rheological behavior of aqueous suspensions, while flow curves analysis allowed optimizing processing parameters, such as, powder content, amount of deflocculant and binder, and sonication time. Optimized colloidal suspensions were prepared and used to obtain high quality tapes. Processed ceramics from these stacked tapes show equivalent properties to those processed directly from powders, which demonstrates the effectiveness of the colloidal route reported here.
关键词： Aqueous tape casting,KNN,Lead-free,Rheological properties,Colloidal suspensions
更新于2025-11-14 17:28:48
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A polarization sensitive light scattering unit for high throughput screening
摘要： A simple, effective light scattering prototype sensitive to both polarized and depolarized scattering was constructed, and its performance was tested on a variety of pure liquids and optically isotropic and anisotropic polymer solutions and colloidal suspensions. The results, performance, and means to further improvement are reported here. Because of its simplicity and low cost, many identical units can be produced to construct a simultaneous multiple sample light scattering platform that can be used to monitor polymer and colloid solution stability, phase changes, aggregation, degradation, etc. Measurable depolarization was found for a variety of organic liquids and suspensions of both poly?uoroethylene and latex spheres. No detectable depolarization was found for various polymers.
关键词： light scattering,depolarized scattering,colloidal suspensions,polymer solutions,high throughput screening,polarization sensitive
更新于2025-09-10 09:29:36