A comparison study of the efficiency and ac- curacy a variety meshless trial test functions is presented in this paper, based on general concept local Petrov-Galerkin (MLPG) method. 5 types functions, 6 are explored. Different result different MLPG methods, six such methods pre- sented paper. In all these absolutely no meshes needed either for interpo- lation or integration weak-form; while other require background cells. Because complicated shape function inevitable at present stage, order...

Intriguing topological polar structures in oxide nanofilms have drawn growing attention owing to their immense potential applications nanoscale electronic devices. Here, we report a novel route mechanically manipulate via flexoelectricity wrinkled thin films. Our results present flexoelectric transition from nonpolar state uniaxial stripes, biaxial meronlike or antimeronlike structures, and labyrinths by varying wrinkle morphologies. The evolution mechanisms the outstanding mechanical...

The effects of surface and flexoelectricity have been found in the presence strong size dependence should be technically taken into account for nano-scaled dielectric structures. This paper proposes a Bernoulli–Euler beam model to investigate electromechanical coupling response piezoelectric nanostructures, which elasticity, dielectricity piezoelectricity as well bulk are all consideration. governing equations with non-classical boundary conditions naturally derived from variational...

Because of the flexoelectric effect, dielectric materials usually polarize in response to a strain gradient. Soft are good candidates for developing large gradient because their deformability. However, they always suffer from lower coefficients compared ceramics. In this work, flexoelectriclike effect is introduced enhance effective flexoelectricity polydimethylsiloxane bar. The realized by depositing layer net charges on middle plane bar form an electret. Experiments show that enhancement...

Flexoelectricity (FE) refers to the two-way coupling between strain gradients and electric field in dielectric materials, is universal compared piezoelectricity, which restricted dielectrics with noncentralsymmetric crystalline structure. Involving makes phenomenon of flexoelectricity size dependent more important for nanoscale applications. However, involve higher order spatial derivate displacements bring difficulties solution flexoelectric problems. This dilemma impedes application such...

The symmetry breaking of inversion in solid crystals will induce electric polarization all crystals, which is well known as flexoelectricity. At the nanometer scale, due to large ratio surface volume, piezoelectric structures always exhibit distinct mechanical and electrical behaviors compared with their bulk counterparts. In current work, effects flexoelectricity on buckling vibration nanowires investigated based a continuum framework Euler–Bernoulli beam hypothesis. Analytical solutions...

The histone acetyltransferase MOF is a member of the MYST family. In mammals, plays critical roles by acetylating H4 at K16 and non-histone substrates such as p53. Here we have investigated role in human lung cancer possible new hMOF.Samples non-small cell (NSCLC) were used to correlate with clinicopathological parameters NF-E2-related factor 2 (Nrf2) downstream genes. 293T-cells study interactions between Nrf2, acetylation Nrf2 MOF. Mouse embryonic fibroblast A549 cells utilized assess...

A size-dependent nonclassical Bernoulli–Euler beam model based on the strain gradient elasticity is proposed for piezoelectric nanowires. The governing equations and corresponding boundary conditions are naturally derived from variational principle. Different classical theory, electric field–strain coupling both taken into account. Static bending problem of a cantilever nanobeam solved to illustrate effect gradient. present contains material length scale parameters can capture size dependent...

Flexoelectricity presents a strong size effect, and should not be ignored for nanodevices. By taking the flexoelectricity into account, an analytical solution is deduced piezoelectric potential generated in bent ZnO nanowire (NW) cantilever. It shown that electric NW independent of z-coordinate, which different from results based on classical theory. The also show effect voltage significant even though flexoelectric coefficients are set to minimum. Moreover, we find plays important role...

Recently, dysregulation of microRNAs plays a critical role in cancer metastasis. Here, an vivo selection approach was used to generate highly aggressive NSCLC sub-cell lines followed by comparing the expression using microarrays. miR-124 notably deregulated both invasive and node-positive specimens. Over-expression robustly attenuated migration metastatic ability cells. MYO10 subsequently identified as novel functional downstream target miR-124, up-regulated tissues. Knockdown inhibited cell...

In dielectric materials, due to the flexoelectric effect, a large inhomogeneous deformation can break or significantly alter inversion symmetry of material and induce net polarization. Such phenomenon is distinctive comparing other forms electromechanical coupling, such as piezoelectricity electrostriction, in that it an intrinsic universal effect whose strength scales up with decrease sample size. Research works past decade indicate emergence flexoelectricity not only provides new way...

We experimentally studied the built-in polarization induced effective piezoelectric constant and direct flexoelectric coefficient in α-phase bulk polyvinylidene fluoride (PVDF). This phenomenon was detected discussed based on compression of a truncated cone. An improved mechanical formulation flexoelectricity presented this study, experiment carried out charge measurement. From coupling 202.3 V calculated from μ11=1.6×10−8C/m for fluoride. measured response PVDF with consideration residual...

Due to the electromechanical coupling effect, mechanical energy can be converted into electrical in certain materials. A theoretical framework is established investigate circuit voltage, electric power of nanoscale harvesting, which vibration was by piezoelectric and flexoelectric effects. Analytical solutions for maximum potential, voltage generated bent BaTiO3 (BT), ZnO nanowires (NWs) Pb(Mg1/3Nb2/3)O3 (PMN) nanofilms (NFs) were derived. Static dynamic analyses are conducted obtain...

Abstract Flexoelectricity, a universal electromechanical coupling phenomenon, has triggered new feasibilities of advancements in functional materials, especially for nanoscale materials. The strong flexoelectric response is initially discovered ceramic materials with high permittivity, and then the past decades have witnessed expansion flexoelectricity to broader range material systems including semiconductors, polymers, soft elastomers, which turn raise emerging applications...

Different from piezoelectricity which is restricted to certain materials, flexoelectricity a universal electromechanical coupling in all dielectrics. In this work, mechanical energy harvester models were developed based on Timoshenko laminated beam theory, the flexoelectric and piezoelectric mechanisms discussed. For three-layered parallel configuration, vibration can be converted into electrical due flexoelectricity, for series conversion enhanced by flexoelectricity. Resonance frequency...

In this paper, the flexoelectric effect on Love waves propagating in a structure with nanoscale piezoelectric guiding layer deposited an isotropic elastic substrate is analytically investigated. Transcendental complex dispersion equations are obtained and solved numerically which corresponding to electrically open short conditions at free surface. A detailed discussion about relations of fundamental mode subsequently presented. The results indicate that flexoelectricity has substantial wave...