Influence of the Structural Properties of Poly(vinylidene fluoride) Membranes on the Heterogeneous Nucleation Rate of Protein Crystals

2006 ◽  
Vol 110 (25) ◽  
pp. 12438-12445 ◽  
Author(s):  
Efrem Curcio ◽  
Enrica Fontananova ◽  
Gianluca Di Profio ◽  
Enrico Drioli
Keyword(s):  
Structural Properties ◽  
Nucleation Rate ◽  
Heterogeneous Nucleation ◽  
Vinylidene Fluoride ◽  
Protein Crystals ◽  
Poly Vinylidene Fluoride

scholarly journals Electrostrictive and Structural Properties of Poly(Vinylidene Fluoride-Hexafluoropropylene) Composite Nanofibers Filled with Polyaniline (Emeraldine Base)

Polymers ◽  
2021 ◽  
Vol 13 (19) ◽  
pp. 3250
Author(s):  
Nikruesong Tohluebaji ◽  
Chatchai Putson ◽  
Nantakan Muensit ◽  
Jureeporn Yuennan
Keyword(s):  
Dielectric Properties ◽  
Structural Properties ◽  
Crystalline Phase ◽  
Phase Structure ◽  
Composite Nanofibers ◽  
Microelectromechanical Systems ◽  
Vinylidene Fluoride ◽  
Emeraldine Base ◽  
Pani Composite ◽  
Poly Vinylidene Fluoride

Previous studies have reported that poly(vinylidene fluoride-hexafluoropropylene) (P(VDF-HFP)) copolymers can exhibit large electrostrictive strains depending on the filler. This work examines the electrostrictive and structural properties of P(VDF-HFP) nanofibers modified with conductive polymer polyaniline (PANI). The P(VDF-HFP)/PANI composite nanofibers were prepared by an electrospinning method with different PANI concentrations (0, 0.5, 1, 1.5, 3 and 5 wt.%). The average diameter, water contact angle and element were analyzed by SEM, WCA and EDX, respectively. The crystalline, phase structure and mechanical properties were investigated by XRD, FTIR and DMA, respectively. The dielectric properties and electrostrictive behavior were also studied. The results demonstrated that the composite nanofibers exhibited uniform fibers without any bead formation, and the WCA decreased with increasing amount of PANI. However, a high dielectric constant and electromechanical response were obtained. The electrostrictive coefficient, crystalline, phase structure, dielectric properties and interfacial charge distributions increased in relation to the PANI content. Moreover, this study indicates that P(VDF-HFP)/PANI composite nanofibers may represent a promising route for obtaining electrostrictive composite nanofibers for actuation applications, microelectromechanical systems and sensors based on electrostrictive phenomena.

Correlation between nucleation, phase transition and dynamic melt-crystallization kinetics in PAni/PVDF blends

RSC Advances ◽  
2015 ◽  
Vol 5 (91) ◽  
pp. 74486-74498 ◽  
Author(s):  
Swarup Biswas ◽  
Bula Dutta ◽  
Subhratanu Bhattacharya
Keyword(s):  
Phase Transition ◽  
Crystallization Kinetics ◽  
Heterogeneous Nucleation ◽  
Vinylidene Fluoride ◽  
Melt Crystallization ◽  
Poly Vinylidene Fluoride ◽  
Nucleation Phase ◽  
Kinetics Of

The dynamic melt crystallization kinetics of polyaniline (PAni)/poly(vinylidene fluoride) (PVDF) blends of different compositions has been investigated to understand the influence of PAni on the heterogeneous nucleation and phase transition of PVDF.

Piezoelectric β-polymorph formation of new textiles by surface modification with coating process based on interfacial interaction on the conformational variation of poly (vinylidene fluoride) (PVDF) chains

2020 ◽  
Vol 91 (3) ◽  
pp. 31301
Author(s):  
Nabil Chakhchaoui ◽  
Rida Farhan ◽  
Meriem Boutaldat ◽  
Marwane Rouway ◽  
Adil Eddiai ◽  
...  
Keyword(s):  
High Efficiency ◽  
Vinylidene Fluoride ◽  
Research Work ◽  
Research Area ◽  
Interfacial Interaction ◽  
Tetraethyl Orthosilicate ◽  
Poly Vinylidene Fluoride ◽  
Carbon Nanofillers ◽  
The Impact ◽  
Advanced Applications

Novel textiles have received a lot of attention from researchers in the last decade due to some of their unique features. The introduction of intelligent materials into textile structures offers an opportunity to develop multifunctional textiles, such as sensing, reacting, conducting electricity and performing energy conversion operations. In this research work nanocomposite-based highly piezoelectric and electroactive β-phase new textile has been developed using the pad-dry-cure method. The deposition of poly (vinylidene fluoride) (PVDF) − carbon nanofillers (CNF) − tetraethyl orthosilicate (TEOS), Si(OCH2CH3)4 was acquired on a treated textile substrate using coating technique followed by evaporation to transform the passive (non-functional) textile into a dynamic textile with an enhanced piezoelectric β-phase. The aim of the study is the investigation of the impact the coating of textile via piezoelectric nanocomposites based PVDF-CNF (by optimizing piezoelectric crystalline phase). The chemical composition of CT/PVDF-CNC-TEOS textile was detected by qualitative elemental analysis (SEM/EDX). The added of 0.5% of CNF during the process provides material textiles with a piezoelectric β-phase of up to 50% has been measured by FTIR experiments. These results indicated that CNF has high efficiency in transforming the phase α introduced in the unloaded PVDF, to the β-phase in the case of nanocomposites. Consequently, this fabricated new textile exhibits glorious piezoelectric β-phase even with relatively low coating content of PVDF-CNF-TEOS. The study demonstrates that the pad-dry-cure method can potentially be used for the development of piezoelectric nanocomposite-coated wearable new textiles for sensors and energy harvesting applications. We believe that our study may inspire the research area for future advanced applications.

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