Abstract:Robust nanocomposite coatings based on polyvinylidene fluoride (PVDF) and molybdenum disulfide (MoS 2 ) nanoplatelets were prepared by a spray coating method. To achieve various surface structures, the coatings were dried at room and oven temperatures (20 and 200 C). All the samples dried at room temperature exhibited a highly porous surface structure, attributed to the strong nonsolvent role of water vapor, which triggered the nonsolvent-induced phase separation (VIPS). On the other hand, the oven-dried coati… Show more
“…[ 91,92 ] However, although the exfoliation of MoS 2 to monolayer was performed for the first time in 1986, [ 93 ] major attention to the material was drawn only after the emergence of graphene. [ 94–99 ] As soon as Geim and Novoselov's [ 100 ] discussion on the “electric field effect in atomically thin carbon films” gained momentum, several researchers devoted their attention to MoS 2 and other TMDs.…”
Section: Dm Intrinsic Propertiesmentioning
confidence: 99%
“…[91,92] However, although the exfoliation of MoS 2 to monolayer was performed for the first time in 1986, [93] major attention to the material was drawn only after the emergence of graphene. [94][95][96][97][98][99] As soon as Geim and Novoselov's [100] discussion on the T A B L E 3 Thermal conductivity of the addressed 2DM and some derivatives…”
2D materials are a very up-and-coming class of additives in the field of polymer composites due to their versatility and exceptional intrinsic properties. This enables researchers to create a variety of nanocomposites that can be employed in a myriad of emerging multifunctional applications. The performance of such nanocomposites depends heavily on the quality of the 2D materials, their interactions with the polymer matrix, as well as on their dispersion and morphology when embedded in the polymer. In order to control these variables, one needs to choose wisely between the available synthesis techniques and mixing strategies, playing with the process-structure-property relationships, while keeping in mind the compatibility with current industrial infrastructure. Therefore, this paper presents a brief review on the 2D materials most used in polymer nanocomposites, the main synthesis techniques and mixing routes developed, the state of the art on the most sought-after properties in different systems, and what are the effects of the morphology evolution. In each section, the main challenges are highlighted, and possible strategies to overcome them are presented, for example,
“…[ 91,92 ] However, although the exfoliation of MoS 2 to monolayer was performed for the first time in 1986, [ 93 ] major attention to the material was drawn only after the emergence of graphene. [ 94–99 ] As soon as Geim and Novoselov's [ 100 ] discussion on the “electric field effect in atomically thin carbon films” gained momentum, several researchers devoted their attention to MoS 2 and other TMDs.…”
Section: Dm Intrinsic Propertiesmentioning
confidence: 99%
“…[91,92] However, although the exfoliation of MoS 2 to monolayer was performed for the first time in 1986, [93] major attention to the material was drawn only after the emergence of graphene. [94][95][96][97][98][99] As soon as Geim and Novoselov's [100] discussion on the T A B L E 3 Thermal conductivity of the addressed 2DM and some derivatives…”
2D materials are a very up-and-coming class of additives in the field of polymer composites due to their versatility and exceptional intrinsic properties. This enables researchers to create a variety of nanocomposites that can be employed in a myriad of emerging multifunctional applications. The performance of such nanocomposites depends heavily on the quality of the 2D materials, their interactions with the polymer matrix, as well as on their dispersion and morphology when embedded in the polymer. In order to control these variables, one needs to choose wisely between the available synthesis techniques and mixing strategies, playing with the process-structure-property relationships, while keeping in mind the compatibility with current industrial infrastructure. Therefore, this paper presents a brief review on the 2D materials most used in polymer nanocomposites, the main synthesis techniques and mixing routes developed, the state of the art on the most sought-after properties in different systems, and what are the effects of the morphology evolution. In each section, the main challenges are highlighted, and possible strategies to overcome them are presented, for example,
“…Alternatively, piezoelectric polymers have shown a significant role in energy harvesting for similar applications accounting for the benefits of inexpensive, high flexibility, low weight, and ability to form complicate contours 11 . The different piezoelectric polymers like poly‐L‐lactic acid, polyvinylidene fluoride (PVDF) and their co‐polymers are widely known for their piezoelectric behavior used in different applications such as electromagnetic interference shielding, corrosion, additive manufacturing and structural health monitoring 12–16 . In comparison with all these piezoelectric materials, PVDF has better formability and good piezoelectric responses 17–19 …”
The emerging field of energy harvesting depends on the electrically conductive materials that are highly flexible and deformable. The morphological, structural, thermal, mechanical, and piezoelectric output studies of electrospun polyvinylidene fluoride (PVDF) and PVDF/WO3 nanorods composite nanofibers were investigated for the piezoelectric energy harvesting applications. There is a significant enhancement in the piezoelectric β phase after the addition of the WO3 nanorods into the PVDF. The elemental composition of the PVDF/WO3 nanorods composite nanofibers is confirmed by the W, O, F, and C elements. The thermal stability of the WO3 nanorods added composite nanofibers was increased up to 30°C in reference to TGA responses. Based on the mechanical test, the maximum tensile strength and modulus of elasticity were enhanced around by 220 and 246% for the WO3‐integrated PVDF nanofibers. Furthermore, the piezoelectric coefficient of 18.98 pC/N is achieved for the composite PVDF nanofibers which are mainly due to the improvement of the electroactive β phase. The piezoelectric energy harvesting responses were found an output voltage of 2.1 V based on the microstrain set‐up. Thus, these WO3 nanorods incorporated PVDF nanofibers keep the great potential for the piezoelectric energy harvesting, wearable electronics and biomedical applications.
“…Polyvinylidene fluoride (PVDF) is often employed as a matrix material in the preparation of separation membranes due to its superior physical and chemical stability. [1][2][3][4][5] It is used extensively in membrane distillation, permeation gasification, microfiltration, ultrafiltration, and other membrane species. Currently, non-solvent induced phase transition (NIPS) is one of the most used techniques for preparing PVDF membranes.…”
Pore‐forming agents affect phase thermodynamics of solution‐case membranes, hence influencing the structure and properties of the membrane. Polyvinylidene fluoride (PVDF) membrane has many advantages, but more in‐depth research is needed regarding directional control of membrane pore size. To solve this problem, a simple and efficient method is proposed. By adjusting the percentage of polyvinylpyrrolidone (PVP) in the casting solution, pore diameter is controlled between 0.01 and 10 μm. The number density and diameter of the inner surface increased significantly with increasing PVP content. The relevance of this study lies in the modulation of the inner surface micropore size of PVDF hollow fiber membranes in a simple and efficient procedure.Highlights
Adjusting the size of micropores on the inner surface.
The size range of the inner surface is controlled between 0.01 and 10 μm.
It is possible to regulate the pore structure by limiting PVP concentration.
Significant increase in the number and size of pore on the inner surface.
A simple method for regulating the size of micropores.
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