研究目的
To investigate the coupling effect of graphene oxide (GO) addition and waste cathode-ray tube (CRT) glass replacement on mitigating electromagnetic interference (EMI) in cement-based composites.
研究成果
The coupling use of waste CRT glass and graphene oxide significantly increases the electrical permittivity of cement-based composites, enhancing their EMI shielding ability. This synergy allows for effective mitigation of electromagnetic pollution and promotes the recycling of toxic waste CRT glass. Key findings include increased density with CRT glass replacement, slight changes in electrical resistivity with GO addition, and substantial permittivity improvements at specific frequencies.
研究不足
The study uses a specific thickness for specimens that may affect the accuracy of permittivity measurements due to fringing electric field effects. The GO content is low and below the percolation threshold, limiting its impact on electrical conductivity. The research focuses on EMI shielding evaluation through permittivity and does not include direct EMI shielding effectiveness tests or long-term environmental impact assessments of waste CRT glass leaching.
1：Experimental Design and Method Selection:
The study uses a decoupling method to measure electric permittivity for evaluating EMI shielding capacity, and a four-probe method for DC electrical resistance measurement. The methodology involves preparing cement mortar with varying GO and CRT glass contents, curing specimens, and conducting electrical and density measurements.
2：Sample Selection and Data Sources:
Specimens are prepared with ordinary Portland cement, fly ash, fine aggregates (standard sand and waste CRT glass), graphene oxide, and a polycarboxylate-based water-reducing admixture. Waste CRT glass is sieved into specific particle sizes, and its chemical composition is analyzed.
3：List of Experimental Equipment and Materials:
Equipment includes a laser particle size analyzer, ultrasonic homogenizer, atomic force microscopy (AFM), transmission electron microscopy (TEM), PARSTAT 4000+ potentiostat/galvanostat for EIS, and tools for DC resistivity and density measurements. Materials include cement, fly ash, GO powder, waste CRT glass, standard sand, deionized water, and polycarboxylate admixture.
4：Experimental Procedures and Operational Workflow:
GO is dispersed in deionized water via sonication. Cement, fly ash, and aggregates are mixed, followed by addition of GO dispersion and admixture. Mortar is cast into molds, vibrated, demolded, and cured. Permittivity is measured using a parallel-plate capacitor setup with copper electrodes and insulating film, and DC resistivity is measured via four-probe method. Density is measured after drying specimens.
5：Data Analysis Methods:
Permittivity is calculated from capacitance measurements using a decoupling equation. Data are analyzed for trends in electrical properties with varying GO and CRT glass contents, and statistical deviations are noted.
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