Self-recovery of stressed nanomembranes

Jiang, Chaoyang; Rybak, Beth; Markutsya, Sergiy; Kladitis, P.E.; Tsukruk, Vladimir V.

doi:10.1063/1.1889239

Cited by 27 publications

(34 citation statements)

References 23 publications

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“…[126] In addition, extremely low creep and a unique "self-recovery" ability has been observed for SA-LbL films upon releasing them from deformation close to the ultimate strain. [126] Such self-recovery behavior is essential for fabricating devices with long lifetimes, robustness, and reproducible dynamic properties.…”

Section: Micromechanical Propertiesmentioning

confidence: 98%

“…[28] The mechanical sensitivity measured for these films is close to 1 nm Pa -1 , which is also promising for sensitive acoustic microsensing. [126] In our recent study, we have demonstrated that ultrathin LbL films (less than 70 nm in thickness) can be suspended over large microfabricated arrays of pre-fabricated microcavities. Thus, arrays of gas microcavities sealed with a flexible membrane can be fabricated.…”

Section: Freestanding Lbl Structures As Photothermal Arraysmentioning

confidence: 99%

“…Furthermore, thinner films are expected to possess a much greater sensitivity than their thicker counterparts, enabling applications such as mechanical sensing. [126] For example, freestanding PAH/PSS multilayer films with gold nanoparticles behave as completely elastic films even under extreme-deformation conditions. [126] In addition, extremely low creep and a unique "self-recovery" ability has been observed for SA-LbL films upon releasing them from deformation close to the ultimate strain.…”

Section: Micromechanical Propertiesmentioning

confidence: 99%

“…[126] For example, freestanding PAH/PSS multilayer films with gold nanoparticles behave as completely elastic films even under extreme-deformation conditions. [126] In addition, extremely low creep and a unique "self-recovery" ability has been observed for SA-LbL films upon releasing them from deformation close to the ultimate strain. [126] Such self-recovery behavior is essential for fabricating devices with long lifetimes, robustness, and reproducible dynamic properties.…”

Section: Micromechanical Propertiesmentioning

confidence: 99%

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Freestanding Nanostructures via Layer‐by‐Layer Assembly

2006

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Freestanding flexible nanocomposite structures fabricated by layer‐by‐layer (LbL) assembly are promising candidates for many potential applications, such as in the fields of thermomechanical sensing, controlled release, optical detection, and drug delivery. In this article, we review recent advances in the fabrication and characterization of different types of freestanding LbL structures in air and at air/liquid and liquid/liquid interfaces, including micro‐ and nanocapsules, microcantilevers, freely suspended membranes, encapsulated nanoparticle arrays, and sealed‐cavity arrays. Several recently developed fabrication techniques, such as spin‐assisted coating, dipping, and micropatterning, make the assembly process more efficient and impart novel physical properties to the freestanding films.

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Section: Micromechanical Propertiesmentioning

confidence: 98%

Section: Freestanding Lbl Structures As Photothermal Arraysmentioning

confidence: 99%

Section: Micromechanical Propertiesmentioning

confidence: 99%

Section: Micromechanical Propertiesmentioning

confidence: 99%

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Freestanding Nanostructures via Layer‐by‐Layer Assembly

2006

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“…[12] A significant reinforcement of micromechanical properties along with a peculiar optical response has been reported for these films, including a stress-dependent Raman response, formation of tunable Raman gratings, unprecedented stabilities, and a self-recovery ability. [13] Integration of these freestanding structures into silicon-based arrays of optical cavities has enabled thermal imaging by the direct conversion of IR flux into a visible optical response by a photothermal mechanism. [14] Nanoparticulate materials with unique stimuli-responsive properties constitute a key component of these prospective sensing elements.…”

Section: Introductionmentioning

confidence: 99%

Flexible and Robust 2D Arrays of Silver Nanowires Encapsulated within Freestanding Layer-by-Layer Films

et al. 2006

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Freestanding layer‐by‐layer (LbL) films encapsulating controlled volume fractions (ϕ = 2.5–22.5 %) of silver nanowires are fabricated. The silver nanowires are sandwiched between poly(allylamine hydrochloride)/poly(styrene sulfonate) (PAH/PSS) films resulting in nanocomposite structures with a general formula of (PAH/PSS)10PAH Ag(PAH/PSS)10PAH. The Young's modulus, toughness, ultimate stress, and ultimate strain are evaluated for supported and freestanding structures. Since the diameter of the nanowires (73 nm) is larger than the thickness of the LbL films (total of about 50 nm), a peculiar morphology is observed with the silver nanowires protruding from the planar LbL films. Nanowire‐containing LbL films possess the ability to sustain significant elastic deformations with the ultimate strain reaching 1.8 %. The Young's modulus increases with increasing nanowire content, reaching about 6 GPa for the highest volume fraction, due to the filler reinforcement effect commonly observed in composite materials. The ultimate strengths of these composites range from 60–80 MPa and their toughness reaches 1000 kJ m–3 at intermediate nanowire content, which is comparable to LbL films reinforced with carbon nanotubes. These robust freestanding 2D arrays of silver nanowires with peculiar optical, mechanical, and conducting properties combined with excellent micromechanical stability could serve as active elements in microscopic acoustic, pressure, and photothermal sensors.

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Layer‐by‐Layer Self‐Assembled Multilayer Stimuli‐Responsive Polymeric Films

Zhai

2011

Handbook of Stimuli‐Responsive Materials

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IntroductionMultilayer polymeric films fabricated through the layer-by-layer (LBL) self-assembly technique are able to integrate stimuli-responsive materials into the films through various intermolecular interactions. The ease of the fabrication process and the excellent control of the film composition and morphology, combined with the capability of coating substrates conformally, offers a wide range of multilayer films that change film properties such as permeability, wettability, color, and solubility upon external stimuli. This chapter reviews the methods of building LBL multilayer films and the approaches to control the structures of the films. These smart films provide numerous applications in controlled drug release, sensing, energy generation, and flow regulation with their unique response to external stimuli including pH and temperature change, photo irradiation, application of electrical fields, and specific molecular interactions.Stimuli-responsive coatings, also known as smart coatings, are able to change their properties upon external stimuli including temperature, pH, salt concentration, light, presence of specific molecules, and other factors. The capability of changing surface behavior in an accurate and predictable manner has generated numerous applications ranging from chemical sensing, separations, and drug delivery to various bioapplications. To name a few, smart coatings with tunable hydrophilic/hydrophobic wettability have been used in the development of microand nanofluidic devices, self-cleaning and antifog surfaces, and sensor devices [1-3]. Photochemical-responsive coatings have been applied to build a surface that releases nitric oxide [4] over nanometer length scales for photochemotherapeutic applications, and a surface that can be photoactivated for spatiotemporal control of cell adhesion during cell cultivation [5,6]. The control of the properties of these smart coatings can be achieved through the stimuli-responsive materials forming self-assembled monolayers (SAMs) and polymer films. Among various approaches to fabricate responsive polymer films, multilayered polymer films, generally referred as polyelectrolyte multilayer (PEM) films, fabricated through the LBL assembly technique, have been proven to be effective smart coatings with Handbook of Stimuli-Responsive Materials. Edited by Marek W. Urban

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Self-recovery of stressed nanomembranes

Cited by 27 publications

References 23 publications

Freestanding Nanostructures via Layer‐by‐Layer Assembly

Freestanding Nanostructures via Layer‐by‐Layer Assembly

Flexible and Robust 2D Arrays of Silver Nanowires Encapsulated within Freestanding Layer-by-Layer Films

Layer‐by‐Layer Self‐Assembled Multilayer Stimuli‐Responsive Polymeric Films

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