Piezoelectric membranes for separation processes: Fabrication and piezoelectric properties

Crystalline polymorphism in poly(vinylidenefluoride) membranes

“…Three distinct layers appeared after poling rather than the interconnected open pores before. The polymorph of the PVDF membrane changed from mostly the α phase to a predominantly β phase, and the formation mechanism of the β form was proposed [3] in Fig. 19.…”

“…A schematic outlining the hypothetical basis of the molecular and morphological changes of a PVDF membrane during polarization in an intense electric field. More details can be found in [3]. [3], Copyright 2013.…”

“…It should pay attention to that poling treatment changes the membrane structure [3], and consequently the rejection [153], in addition to the polymorphs and permeability.…”

“…Membrane fouling is one of the major problems decreasing membrane permeability during The piezoelectric PVDF membranes mentioned above were tested to control fouling using vibration caused by an AC signal [3,5,151]. When filtrating poly(ethylene glycol) (PEG)…”

Novel hybrid multifunctional magnetoelectric porous composite films

“…Compared to its PVDF homo-polymer, PVDFTrifuoroethylene P(VDF-TrFE) displays further advantages such as high dipole moment, high dielectric constant, and possibility of controlling porosity at room temperature 7 . Furthermore, P(VDF-TrFE), for TrFE contents between 50 and 80%, crystallizes in the piezoelectric phase independently of the processing method, allowing the preparation of piezoelectric porous films with improved flux and fouling in the case of filtration and separation membranes [8][9] , improved sensing properties for biomedical monitoring 10 and with the possibility of environmental energy storage and harvesting 11 .…”