Spontaneous bending of piezoelectric nanoribbons: Mechanics, polarization, and space charge coupling

Shape selection and multi-stability in helical ribbons

“…Our results are also consistent with the transition between twisted and helical shapes in self-assembled amphiphiles. 35 We also applied our theory to the shape transitions in the central hydrophobic nucleating core of the Ab peptide of Alzheimer's disease, Ab (16)(17)(18)(19)(20)(21)(22). 39,51 In solution, this peptide assembles into purely twisted ribbons or cylindrical helical ribbons.…”

Nonlinear Geometric Effects in Mechanical Bistable Morphing Structures

“…We employ this model to perform a comprehensive examination of bistability, leading to unique predictions for bifurcation thresholds and bistable morphologies that are quantitatively validated with a series of tabletop experiments. More generally, our approach provides a quantitative means to investigate the role of geometric nonlinearities in a broader setting, including morphogenesis [22][23][24][25], film-on-substrate electronics [26][27][28], and spontaneous bending, twisting, and buckling of thin films and helical ribbons [29][30][31][32][33][34][35].We employ a simple experimental demonstration of the morphological transition from mono-to bistable states when the dimensions change (either the width increases or thickness decreases), with all other parameters fixed. To this end, two pieces of thin latex rubber sheets (thickness H 1 , length L, and width W L) are prestretched by an equal amount and bonded to an elastic strip of thicker, pressure-sensitive adhesive (thickness H 2 ) [36] as shown PRL…”

Wachstumsinduziertes Biegen und Verwinden von Einkristallen

“…[184] Solche Strukturen umfassen insbesondere Nanoringe und Nanohelices von ZnO (Abbildung 8), GaN, AlN, InP, Ag 2 V 4 O 11 und SnO 2 . [185][186][187][188][189][190][191][192][193][194][195][196][197] Mesoskopische verwundene Kristalle (ca. 500 nm < h < 100 mm) umfassen 10,12-Tricosadynoesäureanhydrid [45] und (1,4-Bis[2-(pyren-1-yl)vinyl]-2,5-dimethylbenzol)-IBr 2 .…”

“…ZnO-, GaN-und AlN-Nanobänder [185,189,191] mit polaren Wurtzit-artigen Kristallstrukturen (P6 3 mc) entwickeln breite {0001}-Flächen. ¾hnliche Nanobänder werden für die polaren Oberflächen von kubischem InP F " 43m À Á , [195] tetragonalem SnO 2 (P4 2 /mnm) [197] und monoklinem Ag 2 V 4 O 11 (C2/m) [196] beobachtet.…”

“…Es wurden quantitative Modelle der R(h)-Abhängigkeit von der Oberflächenladung entwickelt. [185,186,188,191,193] Modelle der Verwindung durch Elektrostatik und Piezoelektrizität sind aber auf eine eng definierte Klasse von Nanokristallen mit geeigneter Morphologie und polaren Oberflächen beschränkt. Sie kçnnen beispielsweise nicht auf zentrosymme-trisches SnO 2 und Ag 2 V 4 O 11 angewendet werden.…”