Electrospinning of Polymeric and Ceramic Nanofibers as Uniaxially Aligned Arrays

Li, Dan; Wang, Yuliang; Xia, Younan

doi:10.1021/nl0344256

Cited by 1,428 publications

(1,132 citation statements)

References 31 publications

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“…Cheng et al used near-field electrospinning to synthesize the single PVDF NFs, where the high electric field used to draw the NF was suggested to naturally align the dipoles along the NF long axis. Alternatively, we used conventional electrospinning (see Experimental Methods for details) with the two electrode technique 13 to synthesize and pattern an array of aligned NFs, followed by a post, in-plane poling process (Figure 1aϪd). A scanning electron microscopy (SEM) image ( Figure 1b, inset) reveals the textured morphology on the NF surface, presumably resulting from the formation of small crystallites.…”

Section: Resultsmentioning

confidence: 99%

Hybrid Nanogenerator for Concurrently Harvesting Biomechanical and Biochemical Energy

et al. 2010

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. † These authors contributed equally.T he ever increasing energy demand of modern society is perhaps among the greatest challenges humankind is and will continue to face. Research in energy includes but is not limited to the following major areas: mega-scale energy conversion, renewable and green energy, efficient energy transmission, energy storage, energy harvesting, and sustainable power source for micro-or nanosystems. In addition to large-scale energy harvesting from "renewable" sources, such as wind, hydro, and solar, there is also significant opportunity to harvest the wasted energy in our personal environments, such as from walking, typing, speaking, and breathing. If efficiently harvested to its full potential, many of the modern energy requirements needed for small devices and even personal electronics could be fulfilled. This is a new trend in the worldwide effort in developing technologies related to energy scavenging. 1Ϫ3 Energy harvested from the environment will likely be sufficient for powering nanodevices used for periodic operation, owing to their extremely low power consumption and small sizes. For example, an implantable device that wirelessly communicates the local glucose concentration for diabetes management, the local temperature for infection monitoring after surgery, or a pressure difference to indicate blockage of fluid flow in the central nervous system and blood clotting can all be foreseen as potential applications that need implantable energy sources. Powering such devices could be accomplished by concurrently harvesting energy from multiple sources within the human body, including mechanical and biochemical energy to augment or even replace batteries. However, powering implantable nanodevices for biosensing using energy scavenging/harvesting technology is rather challenging because the only available energy in vivo is mechanical, biochemical, and possibly electromagnetic energy, whereas thermal energy cannot be harvested due to lack of an adequate temperature gradient, and solar energy is not available for devices implanted inside the body.A recent breakthrough in harvesting mechanical energy by nanowire based nanogenerators (NG) has demonstrated an excellent route for harvesting the biomechanical energy created from tiny physical motion, such as the inhaling/exhaling of lungs or the beat of a heart. 4Ϫ8 In addition, approaches have been demonstrated for converting the biochemical energy of glucose/O 2 in biofluid using active enzymes as catalysts in a compartmentless biofuel cell (BFC). 9Ϫ11 In this paper, we demonstrate the first integrated operation of a hybrid nanogenerator composed of a nanogenerator and biofuel cell for simultaneously or independently harvesting mechanical and biochemical energy, with the aim of building

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Section: Resultsmentioning

confidence: 99%

Hybrid Nanogenerator for Concurrently Harvesting Biomechanical and Biochemical Energy

et al. 2010

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“…The electric potential applied between the tip of the needle and the grounded collector placed 15 cm below was equal to 30 kV. In order to produce uniaxially oriented fibers for magnetometric studies, we employed a collector consisting of two separated bars of a conductive material [32]. The fibers were formed at 22°C and humidity in the range from 30 to 40%.…”

Section: Electrospinning and Calcinationsmentioning

confidence: 99%

Magnetic Fe doped ZnO nanofibers obtained by electrospinning

Baranowska‐Korczyc

Reszka

Sobczak

et al. 2011

J Sol-Gel Sci Technol

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We demonstrate structural and room temperature magnetic properties of Fe doped ZnO nanofibers (NFs) obtained by electrospinning followed by calcination. The observed NFs, formed from crystalographically oriented, approximately 4.5 nm particles conglomerates, were approximately 200 nm in diameter. The reported synthesis of room temperature ferromagnetic Fe doped ZnO NFs is both facile and economical, and is therefore suggested as a generic method of fabricating biocompatible magnetic materials. The major substrates selected for the NFs synthesis (Zn, Fe) comprised of relatively low toxicity materials. Incorporating 10% Fe into ZnO does not modify the wurtzite crystal structure of the host material. No evidence of impurity phase was detected by either X-ray or electron diffraction. Magnetometry studies and Magnetic Force Microscopy imaging reveal a local ferromagnetic order that persists up to room temperature. We suggest that the observed phenomenon is either due to a mechanism mediated by presence of oxygen vacancies and/or is related to iron-rich precipitates.

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“…23−26 Since electrospinning is a continuous process devoid of any contact force for elongation, very long fibers can be collected into a 3D mat. 27,28 Additionally, the electrospun TiO 2 −NF may comprise of a thinner diameter and a very high surface to volume ratio further enhanced by porosity. 29 The size of TiO 2 −NF can be easily controlled by tuning solution viscosity, flow rate of melt, electric field, humidity etc.…”

Section: Introductionmentioning

confidence: 99%

Highly Sensitive Biofunctionalized Mesoporous Electrospun TiO₂ Nanofiber Based Interface for Biosensing

Mondal

Ali²,

Agrawal³

et al. 2014

ACS Appl. Mater. Interfaces

139

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ABSTRACT:The surface modified and aligned mesoporous anatase titania nanofiber mats (TiO 2 −NF) have been fabricated by electrospinning for esterified cholesterol detection by electrochemical technique. The electrospinning and porosity of mesoporous TiO 2 −NF were controlled by use of polyvinylpyrrolidone (PVP) as a sacrificial carrier polymer in the titanium isopropoxide precursor. The mesoporous TiO 2 − NF of diameters ranging from 30 to 60 nm were obtained by calcination at 470°C and partially aligned on a rotating drum collector. The functional groups such as −COOH, −CHO etc. were introduced on TiO 2 −NF surface via oxygen plasma treatment making the surface hydrophilic. Cholesterol esterase (ChEt) and cholesterol oxidase (ChOx) were covalently immobilized on the plasma treated surface of NF (cTiO 2 −NF) via N-ethyl-N0-(3-dimethylaminopropyl carbodiimide) and N-hydroxysuccinimide (EDC-NHS) chemistry. The high mesoporosity (∼61%) of the fibrous film allowed enhanced loading of the enzyme molecules in the TiO 2 −NF mat. The ChEt-ChOx/cTiO 2 −NF-based bioelectrode was used to detect esterified cholesterol using electrochemical technique. The high aspect ratio, surface area of aligned TiO 2 −NF showed excellent voltammetric and catalytic response resulting in improved detection limit (0.49 mM). The results of response studies of this biosensor show excellent sensitivity (181.6 μA/mg dL −1 /cm 2 ) and rapid detection (20 s). This proposed strategy of biomolecule detection is thus a promising platform for the development of miniaturized device for biosensing applications.

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Electrospinning of Polymeric and Ceramic Nanofibers as Uniaxially Aligned Arrays

Cited by 1,428 publications

References 31 publications

Hybrid Nanogenerator for Concurrently Harvesting Biomechanical and Biochemical Energy

Hybrid Nanogenerator for Concurrently Harvesting Biomechanical and Biochemical Energy

Magnetic Fe doped ZnO nanofibers obtained by electrospinning

Highly Sensitive Biofunctionalized Mesoporous Electrospun TiO₂ Nanofiber Based Interface for Biosensing

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Electrospinning of Polymeric and Ceramic Nanofibers as Uniaxially Aligned Arrays

Cited by 1,428 publications

References 31 publications

Hybrid Nanogenerator for Concurrently Harvesting Biomechanical and Biochemical Energy

Hybrid Nanogenerator for Concurrently Harvesting Biomechanical and Biochemical Energy

Magnetic Fe doped ZnO nanofibers obtained by electrospinning

Highly Sensitive Biofunctionalized Mesoporous Electrospun TiO2 Nanofiber Based Interface for Biosensing

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Product

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Highly Sensitive Biofunctionalized Mesoporous Electrospun TiO₂ Nanofiber Based Interface for Biosensing