Abstract:A polystyrene (PS)/paraffin wax composite coating with excellent hydrophobic property was prepared on stainless steel strainer using a simple, inexpensive immersion drying method. The thickness and bonding strength of the composite coating were measured. Scanning electron microscopy (SEM) was used to characterise the coating surface of the stainless steel strainer. The effects of the paraffin concentration in the PS composite coating and the drying temperature of the coating were studied. The contact angles fo… Show more
“…While the water droplet was absorbed by neat PAN nanofiber mat in less than a second, the water contact angle was measured as 121.55° for the composite PAN nanofiber containing 50% PCMs. The hydrophobicity obtained by the addition of PCMs was due to the hydrophobic nature of PCMs, which were 100% pure paraffins and also due to the potentially increased roughness of the nanofiber surfaces in parallel with the study by Guo et al 49 . Figure 12 Contact angles obtained for ( a ) neat PAN and ( b ) composite PAN nanofibers with 50% PCMs (PAN-50PCM28-50PCM32).…”
Section: Resultssupporting
confidence: 66%
“…3 a,b, the bands located at 2955, 2922 and 2852 cm −1 are the characteristic of the aliphatic C–H stretching vibration. Peaks at 1470 and 1465 cm −1 are the bending vibration of the –CH 2 group; 1375 cm −1 is the in-plane bending vibration of C–H and C–C; 728 and 720 cm −1 are the rocking vibration of C–H in the paraffin 48 , 49 . The following peaks are observed in the spectra of PAN nanofibers (Fig.…”
Nanofibers with thermal management ability are attracting great attention in both academia and industry due to the increasing interest in energy storage applications, thermal insulation, and thermal comfort. While electrospinning is basically a fiber formation technique, which uses electrostatic forces to draw ultrafine fibers from a wide variety of polymers, with the addition of phase change materials (PCMs) to the electrospinning solution it enables the production of shape stabilized phase change materials with thermal management functionality. In this study, polyacrylonitrile (PAN) nanofibers containing paraffinic PCMs were produced by electrospinning method and the composite nanofibers obtained were characterized in terms of their morphology, chemical structure, thermal properties, stability, thermal degradation behaviour and hydrophobicity. Besides, PCMs with different phase transition temperatures were added simultaneously into the nanofiber structure in order to investigate the tunability of the thermoregulation properties of the nanofibers. Uniform nanofibers with thermal management functionality were obtained. It could be possible to obtain composite nanofibers showing thermoregulation ability over a wider temperature range by simultaneous addition of PCMs with different melting points into the nanofiber structure. 50 wt% PCM could be added to PAN nanofiber structure wherein the resulting nanofiber exhibited 58.74 J g−1 of enthalpy storage during heating and 57.41 J g−1 of heat release during cooling. The composite nanofibers maintained their cylindrical fiber morphology, structure and composition after multiple heating–cooling cycles and retained their thermal management functionality. The contact angle measurements showed that the addition of PCMs imparted hydrophobicity to the nanofibers.
“…While the water droplet was absorbed by neat PAN nanofiber mat in less than a second, the water contact angle was measured as 121.55° for the composite PAN nanofiber containing 50% PCMs. The hydrophobicity obtained by the addition of PCMs was due to the hydrophobic nature of PCMs, which were 100% pure paraffins and also due to the potentially increased roughness of the nanofiber surfaces in parallel with the study by Guo et al 49 . Figure 12 Contact angles obtained for ( a ) neat PAN and ( b ) composite PAN nanofibers with 50% PCMs (PAN-50PCM28-50PCM32).…”
Section: Resultssupporting
confidence: 66%
“…3 a,b, the bands located at 2955, 2922 and 2852 cm −1 are the characteristic of the aliphatic C–H stretching vibration. Peaks at 1470 and 1465 cm −1 are the bending vibration of the –CH 2 group; 1375 cm −1 is the in-plane bending vibration of C–H and C–C; 728 and 720 cm −1 are the rocking vibration of C–H in the paraffin 48 , 49 . The following peaks are observed in the spectra of PAN nanofibers (Fig.…”
Nanofibers with thermal management ability are attracting great attention in both academia and industry due to the increasing interest in energy storage applications, thermal insulation, and thermal comfort. While electrospinning is basically a fiber formation technique, which uses electrostatic forces to draw ultrafine fibers from a wide variety of polymers, with the addition of phase change materials (PCMs) to the electrospinning solution it enables the production of shape stabilized phase change materials with thermal management functionality. In this study, polyacrylonitrile (PAN) nanofibers containing paraffinic PCMs were produced by electrospinning method and the composite nanofibers obtained were characterized in terms of their morphology, chemical structure, thermal properties, stability, thermal degradation behaviour and hydrophobicity. Besides, PCMs with different phase transition temperatures were added simultaneously into the nanofiber structure in order to investigate the tunability of the thermoregulation properties of the nanofibers. Uniform nanofibers with thermal management functionality were obtained. It could be possible to obtain composite nanofibers showing thermoregulation ability over a wider temperature range by simultaneous addition of PCMs with different melting points into the nanofiber structure. 50 wt% PCM could be added to PAN nanofiber structure wherein the resulting nanofiber exhibited 58.74 J g−1 of enthalpy storage during heating and 57.41 J g−1 of heat release during cooling. The composite nanofibers maintained their cylindrical fiber morphology, structure and composition after multiple heating–cooling cycles and retained their thermal management functionality. The contact angle measurements showed that the addition of PCMs imparted hydrophobicity to the nanofibers.
“…In addition, a stimulus response membrane [56][57][58][59], an inorganic nanostructure superhydrophobic mesh membrane [60,61], and a molecular brush structure super-hydrophilic membrane [62] have also led to the intelligent development of membrane technologies. However, to better transition from the experimental stage to the industrial application stage, the relationship between the separation flux efficiency [63], preparation cost [64], and service life [65], as well as the related evaluation methods and criteria, need to be studied further.…”
Friction is widespread in almost every field in the oil and gas industry, and it is accompanied by huge energy losses and potential safety hazards. To deal with a series of questions in this regard, biomimetic surfaces have been developed over the past decades to significantly reduce economic losses. Presently, biomimetic surface engineering on different scales has been successfully introduced into related fields of the oil and gas industry, such as drill bits and the inner surfaces of pipes. In this review, we focused on the most recent and promising efforts reported toward the application of a biomimetic surface in oil and gas fields, indicating the necessity and importance of establishing this disciplinary study. Regarding the oil and gas industry, we mainly analyzed and summarized some important research results into the following three aspects: (i) applications in reducing the wear of exploration production equipment and its components, (ii) separation and drag release technologies in oil/gas storage and transportation, and (iii) functional coatings used in oil and gas development in oceans and polar regions. Finally, based on an in-depth analysis of the development of biomimetic surface engineering in the fields of oil and gas, some conclusions and perspectives are also discussed. It is expected that biomimetic surface engineering can be used in oil and gas fields more widely and systematically, providing important contributions to green development in the near future.
“…Therefore, hydrophobic surfaces can be obtained by using low surface energy materials such as fluoroalkylsilane [75,76] and wax [77,78]. In the meantime, the hydrophobicity of the surface can also be increased by enhancing surface roughness [79].…”
This review introduced the preparation and structural characterization of polyelectrolyte multilayers in recent years and also summarized the tribology research progress of the polyelectrolyte multilayers, including tribological properties, surface adhesion characteristics, and wear resistance properties. Statistics analysis indicated that nanoparticlesdoped polyelectrolyte multilayers present better friction and wear performance than pristine polyelectrolyte multilayers. Furthermore, the in situ growth method resulted in improved structural order of nanoparticles composite molecular deposition film. In situ nanoparticles not only reduced the molecular deposition film surface adhesion force and friction force but also significantly improved the life of wear resistance. That was due to the nanoparticles that possessed a good load-carrying capacity and reduced the mobility of the polymer-chain segments, which can undergo reversible shear deformation. Based on this, further research direction of in situ nanoparticles molecular deposition film was proposed.
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