Anti‐Biofouling, Thermal, and Electrical Performance of Nanocomposite Coating with Multiwall Carbon Nanotube and Polytetrafluoroethylene‐Blended Polyphenylenesulfide

Abstract

Corrosion, erosion, and fouling by scale deposition are detrimental to heat‐exchanger tube at geothermal binary‐cycle power plants. In this work, polytetrafluoroethylene was blended in a polyphenylenesulfide matrix with different concentrations of multiwall carbon nanotube (MWNT) using the melt‐mixed method to reduce scale deposition on the metal surface. The prepared nanocomposites with different concentrations of MWNT were characterized by various properties such as morphology, hydrophobicity, electrical, thermal, and rheological properties. The morphology of nanocomposite was changed from smooth to nano‐pin‐like with the addition of MWNT. The varied concentration of MWNT led to differing hydrophobicity of nanocomposite. Increasing the loaded amount of MWNT in the nanocomposite led to decreased electrical resistivity up to 3.1 × 103 Ω cm because of percolation of the MWNT in the polymer matrix. In addition, we investigated the enhancement of thermal performance (10% of lower crystallization peak) of the prepared nanocomposite. These performance results indicate that the prepared nanocomposite can be widely adopted for use in high‐performance heat exchangers in geothermal industries.

Research and Development on Coatings and Paints for Geothermal Environments: A Review

“…More recently, Yang et al., [ 121 ] tested a PPS/PTFE/MWCNT (multi‐walled carbon nanotube) composite paint system onto brass substrates, produced by melt compounding process using polyethylene glycol (PEG) surfactant as structure‐directing template. Different load fractions of MWCNT were tested, from 0 to 5 wt.% and the microstructure, composition, and mechanical properties of the resulting paint systems were then analyzed.…”

“…More recently, Yang et al, [121] tested a PPS/PTFE/MWCNT (multi-walled carbon nanotube) composite paint system onto [121] Copyright 2016, Wiley-VCH GmbH.…”

“…Water contact angle measured for PPS, PPS/PTFE and PPS/PTFE/MWCNT paint systems at different MWCNT loading levels. Reproduced with permission [121]. Copyright 2016, Wiley-VCH GmbH.…”

Corrosion and Scaling in Geothermal Heat Exchangers

“…For heat exchanger protection, the coating must possess excellent thermal conductivity, corrosion resistance, and anti-scaling/fouling properties. Achieving superhydrophobicity, often through multi-scale fractal features [84], or with the addition of PTFE fillers [72], is highly desirable to enhance these properties.…”

Factors affecting SiC–ZrO2–MoSi2/Ni antioxidation coating made by composite plating on carbon fibres

“…When composite plating is used to prepare antioxidant coating of CF, the metal elements deposited on the surface are not uniformly distributed. Researchers have tried various methods [23][24][25][26], such as optimising the plating solution and modifying CF, to obtain antioxidant coating with smooth surface, complete structure and excellent oxidation resistance performance.…”