Microsphere with narrow nanopores: Fabrication in PVDF/PMMA/PLLA blend and enhanced adsorption/separation performances

Wang, Jiayao; Cheng, Xiaoqing; Li, Yongjin; You, Jichun

doi:10.1016/j.apsusc.2021.150673

Cited by 13 publications

(9 citation statements)

References 45 publications

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“…Porous PVDF spheres were prepared according to the strategy discussed in our previous work [ 23 ]. In short, in a ternary blend of PVDF/PMMA/PLLA with compatibilizers (SZ-01, 0.5 wt%), phase separation produced PVDF/PMMA mixed phase and PLLA phase.…”

Section: Resultsmentioning

confidence: 99%

“…After that, the PVDF microspheres were obtained by a freeze-drying method. More details can be found in our previous work [ 23 ]. PLLA films were hot-pressed at 200 °C and 10 MPa for 13 min.…”

Section: Methodsmentioning

confidence: 99%

“…A facile strategy for fabrication and transition has been highly desired. In this work, therefore, it is proposed to achieve the programmable transition according to the idea shown in Scheme 1 , in which the shape memory PLLA films are covered by porous PVDF spheres [ 23 ]. After preparation, the surface of PVDF@PLLA composite film exhibits the lotus leaves effect because of the hydrophobic performance and roughness resulting from neighboring spheres, corresponding to a high contact angle and low sliding angle.…”

Section: Introductionmentioning

confidence: 99%

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Programmable Transition between Adhesive/Anti-Adhesive Performances on Porous PVDF Spheres Supported by Shape Memory PLLA

et al. 2022

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Superhydrophobic surfaces with switchable adhesive/anti-adhesive performances are highly desired but still challenging. Herein, by loading porous poly (vinylidene fluoride) (PVDF) spheres on a shape memory polylactic acid (PLLA) film, a quasi-superhydrophobic surface of composite film (PVDF@PLLA) with the ability to tailor its surface structures/composition and related adhesive behaviors was fabricated. The as-prepared surface is covered by porous PVDF spheres. The combination of hydrophobicity of PVDF and hierarchical roughness resulted from porous spheres contributing to the high contact angle and low sliding angle, corresponding to Cassie state and lotus leaves effect. Upon uniaxial or biaxial tension, the distance among hydrophobic spheres is so high that more and more hydrophilic defects (PLLA film) have been exposed to water droplets, accounting for the quasi-superhydrophobic surface with a higher sliding angle. This is the reason for the Wenzel state and rose petals effect. After heating, PLLA film recovers to its original state. The porous PVDF spheres cover the whole film again, leading to the enhanced mobility of water droplets on the surface. The transition between the rose petals effect and the lotus leaves effect is programmable and reversible. Our result provides a novel strategy to tailor adhesive behaviors by combining (quasi-)superhydrophobic surface with shape memory effect.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Programmable Transition between Adhesive/Anti-Adhesive Performances on Porous PVDF Spheres Supported by Shape Memory PLLA

et al. 2022

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“…Hence, scholars have made significant efforts and found that compared with the traditional oil–water separation materials, the superwetting separation materials demonstrate high purity, environmental protection, low cost, and simple operation for emulsion separation 11–13 . Considering these advantages, researchers have successfully formulated a few two‐dimensional (2D) superwetting separation materials, including metal‐mesh, fiber membranes, biological fabrics, and polymeric membranes, which can perform decent emulsion separation 14–17 . The accepted separation mechanism using these superwetting materials is a simple screening filtration mechanism, 18 wherein the oil and water phases have different surface tension on the pore of the separation material.…”

Section: Introductionmentioning

confidence: 99%

Robust graphene/poly(vinyl alcohol) aerogel for high‐flux and high‐purity separation of water‐in‐oil emulsion and its computational fluid dynamic simulation

et al. 2022

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Due to the trade‐off between purity and flux, the development of high‐purity, high‐flux oil–water separation materials is still an arduous challenge. Herein, to achieve emulsion separation with high purity and high permeability, fluorinated graphene/poly(vinyl alcohol) aerogel (FGPA) with strong honeycomb was obtained via a facile freeze‐drying method, and the separation mechanism was investigated via computational fluid dynamics (CFDs) simulation. The as‐prepared FGPA exhibited superhydrophobicity‐superoleophobicity and cyclic compression stability. Under the complex pore and superhydrophobicity, FGPA could separate water‐in‐oil emulsions with droplet sizes several times smaller than their own aperture only under gravity with ultrahigh flux (3255 L m−2 h−1) and ultrahigh purity (99.9%). Also, the separation process as visualized using simulations revealed that the vortex accelerates the demulsification behavior and promotes the gathering of water droplets rebounding on the superhydrophobic surface, so that the water droplets are intercepted. Therefore, FGPA has broad practical application potential in high‐flux and high‐purity oil–water emulsion separation.

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“…15 Besides, the drugs which has lower bioavailability are eliminated from the physiological system with lower degree of absorption. 16,17 Thus the total drug administered is not utilized, and the drug passes through the metabolism organs like kidney or liver and have harmful effects. 18 With the use of sustained release microspheres, we can avoid dose dumping risks and thus increase safety profile.…”

mentioning

confidence: 99%

Fexofenadine HCl Microspheres – Can it be the First Line therapy for Allergic Disorders ?

Arefin

Habib

Mostafa

et al. 2021

Biosci., Biotech. Res. Asia

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Fexofenadine HCl is a second-generation antihistamine which is commonly used for allergic disorders. But it has low bioavailability. Intranasal corticosteroids (INCs) and Immunotherapy and Allergen Specific Immunotherapy (ASIT) are now commonly being suggested for the treatment of allergic disorders. Despite the fact that current treatment alternatives have been in use for decades, patient quality of life has remained static. The treatment options are not much explored for their respective adverse effects. Therefore, they are in desperate need of research. Fexofenadine HCl is available in the form of a suspension, tablet, or capsule. In our current study, we have explored whether microspheres can be the perfect dosage form of Fexofenadine HCl to treat allergic disorders considering the pharmacokinetics of the drug, available dosage forms options and the probable side effects of the current therapies.

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Microsphere with narrow nanopores: Fabrication in PVDF/PMMA/PLLA blend and enhanced adsorption/separation performances

Cited by 13 publications

References 45 publications

Programmable Transition between Adhesive/Anti-Adhesive Performances on Porous PVDF Spheres Supported by Shape Memory PLLA

Programmable Transition between Adhesive/Anti-Adhesive Performances on Porous PVDF Spheres Supported by Shape Memory PLLA

Robust graphene/poly(vinyl alcohol) aerogel for high‐flux and high‐purity separation of water‐in‐oil emulsion and its computational fluid dynamic simulation

Fexofenadine HCl Microspheres – Can it be the First Line therapy for Allergic Disorders ?

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