Transparent and ferroelectric poly (vinylidene fluoride) film achieved by simple ultrasonic spray coating method

Wang, Susu; Liang, Yongri

doi:10.1016/j.matlet.2019.03.096

Cited by 5 publications

(8 citation statements)

References 12 publications

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“…Large size (L) droplets of PVDF solution, a few millimeters in diameter, were prepared by dropping 2 µL of PVDF solution using 5 mL of a syringe, and they were dried at room temperature. The tens micrometers diameter of PVDF solution small size (S) droplets were prepared using the ultrasonic spray method [10] at room temperature or 70 • C. The height of ultrasonic nozzle (Siansonic Technology Co., Ltd., Beijing, China) from substrate was 15 cm for an ultrasonic spray coating with 1 W of the power.…”

Section: Methodsmentioning

confidence: 99%

“…They suggested that the droplet size of the spray and the viscosity of the solution at deposition are the two main factors determining the morphology of the PVDF film, and the solvent is the key parameter to produce polymer thin films in the electrospray process. More recently, we found that a high β-phase content and the high transparency of poly (vinylidene fluoride) (PVDF) film can be achieved using the ultrasonic spray coating (USC) method [10]. In contrast with the conventional blade coating process, the evaporation-induced outward capillary flow can play an important role in the nucleation of PVDF β-phase in the USC process due to fast solvent evaporation.…”

Section: Introductionmentioning

confidence: 99%

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Evaporation-Induced Crystal Nucleation and Morphology of Dried Poly(Vinylidene Fluoride) Droplets

Liang

Wang

2021

Crystals

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The evaporation of a polymer solution droplet is important in solution-based polymer film fabrications, such as inkjet printing, spray coatings, and droplet casting, etc. In this work, we investigated the effect of droplet size, solvent evaporation rate, and concentration on the “coffee-ring” effect, crystal nucleation, polymorphism, and morphology of dried poly(vinylidene fluoride) (PVDF) solution droplets with the atomic force microscopy (AFM) and two-dimensional grazing incidence wide angle X-ray scattering (2D GIWAXS) method. We found that the crystal structure, morphology and crystal distribution in the center and edge regions of dried PVDF droplets were different due to the “coffee-ring” effect. The “coffee-ring” effect of dried PVDF droplets was mainly composited of accumulated crystals at the edge region of a droplet, which was mainly made by the crystallization of migrated chains. The interplay between the migration of chains and the crystallization and solidification of PVDF droplets significantly influenced the formation of the “coffee-ring”. In addition, our results showed that the decrease in droplet size and the controlling solvent evaporation rate were effective ways to improve the electroactive crystalline phases (β and γ-phases) nucleation and decrease the crystal size.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evaporation-Induced Crystal Nucleation and Morphology of Dried Poly(Vinylidene Fluoride) Droplets

Liang

Wang

2021

Crystals

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“…A few millimeters diameter of PVDF solution large size (L) droplets were prepared by dropping 2 μl of PVDF solution using 5ml of syringe, and dried at room temperature. The tens micrometers diameter of PVDF solution small size (S) droplets were prepared by ultrasonic spray method [10] at room temperature or 70 ℃. The height of ultrasonic nozzle (Siansonic Technology Co.,Ltd., China) from substrate was 15 cm for ultrasonic spray coating with 1 W of the power.…”

Section: Methodsmentioning

confidence: 99%

“…Based on the shape of crystals, we can judge that the α-form crystals are almost absence in the dried PVDF/DMF solution S-droplet. Our previous work showed that the ultrasonic spray coated PVDF film was almost absence α-phase [10]…”

Section: Solvent Evaporation Induced Crystal Nucleation and Morphology Of Pvdf/dmf Solution Small Size Dropletmentioning

confidence: 99%

“…More recently, we found that high β-phase content and high transparency of poly (vinylidene fluoride) (PVDF) film can be achieved by ultrasonic spray coating (USC) mothed. [10] In contrast with conventional blade coating process, the evaporation induced outward capillary flow can play an important role in the nucleation of PVDF β-phase in the USC process due to fast solvent evaporation. However, as far as we know, the evaporation induced crystal nucleation and morphology of polymer solution droplets has not been fully understood so far.…”

Section: Introductionmentioning

confidence: 99%

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Evaporation Induced Crystal Nucleation and Morphology of Dried Poly (Vinylidene Fluoride) Droplets

Liang¹,

Wang²

2021

Preprint

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The evaporation of polymer solution droplet is an important in solution-based polymer film fabrications, such as inkjet print, spray coatings, and droplet casting etc. In this work, we investigated the effect of droplet size, solvent evaporation rate, and concentration on “coffee-ring” effect, crystal nucleation, polymorphism, and morphology of dried poly (vinylidene fluoride) (PVDF) solution droplets with atomic force microscopy (AFM) method. We found that the crystal structure, morphology and crystal distribution in the center and edge regions of dried PVDF droplets were different due to “coffee-ring” effect. The “coffee-ring” effect of dried PVDF droplets was mainly composited of accumulated crystals at the edge region of droplet, which was mainly made by crystallization of migrated chains. The interplay between migration of chains, crystallization and solidification of PVDF droplets significantly influenced the formation of “coffee-ring”. In addition, our results showed that the decrease of droplet size and controlling solvent evaporation rate were effective ways to improve the PVDF β-phase nucleation and decrease crystal size.

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Fabrication of poly (vinylidene fluoride) films by ultrasonic spray coating; uniformity and piezoelectric properties

2021

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Transparent and ferroelectric poly (vinylidene fluoride) film achieved by simple ultrasonic spray coating method

Cited by 5 publications

References 12 publications

Evaporation-Induced Crystal Nucleation and Morphology of Dried Poly(Vinylidene Fluoride) Droplets

Evaporation-Induced Crystal Nucleation and Morphology of Dried Poly(Vinylidene Fluoride) Droplets

Evaporation Induced Crystal Nucleation and Morphology of Dried Poly (Vinylidene Fluoride) Droplets

Fabrication of poly (vinylidene fluoride) films by ultrasonic spray coating; uniformity and piezoelectric properties

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