Processing of nanocomposites using supercritical fluid assisted extrusion for stress/strain sensing applications

Poudel, Anup; Karode, Nireeksha; McGorry, Peter; Walsh, Philip R.; Lyons, John G.; Kennedy, James E.; Matthews, Siobhán; Coffey, Austin

doi:10.1016/j.compositesb.2019.01.098

Cited by 23 publications

(12 citation statements)

References 38 publications

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“…Conversely, solvent-cast 1.5% w/v BNNT nanocomposite films were observed to contain BNNT agglomerations as (Figures 1A–D). However, use of further dispersal techniques as described previously could be used for better dispersion of BNNT at higher percentage in the polymer matrix and will be investigated in a follow-up study (Karode et al, 2018; Poudel et al, 2019). 1 wt.% BNNT nanocomposite films were subsequently selected for the focus of this study as the alteration of crystalline behavior of polymers upon the addition of a nanoscale filler is more pronounced when the fillers wt.% is sufficiently lower than the threshold concentration at which agglomeration occurs (Karode et al, 2018).…”

Section: Resultsmentioning

confidence: 99%

Boron Nitride Nanotube Addition Enhances the Crystallinity and Cytocompatibility of PVDF-TrFE

et al. 2019

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Analysis of the cellular response to piezoelectric materials has been driven by the discovery that many tissue components exhibit piezoelectric behavior ex vivo . In particular, polyvinylidene fluoride and the trifluoroethylene co-polymer (PVDF-TrFE) have been identified as promising piezo and ferroelectric materials with applications in energy harvesting and biosensor devices. Critically, the modulation of the structural and crystalline properties of PVDF-TrFE through annealing processes and the addition of particulate or fibrous fillers has been shown to modulate significantly the materials electromechanical properties. In this study, a PVDF-TrFE/boron-nitride nanotube composite was evaluated by modulated differential scanning calorimetry to assess the effects of boron nitride nanotube addition and thermal annealing on the composite structure and crystal behavior. An increased beta crystal formation [f(β) = 0.71] was observed following PVDF-TrFE annealing at the first crystallization temperature of 120°C. In addition, the inclusion of boron nitride nanotubes significantly increased the crystal formation behavior [f(β) = 0.76] and the mechanical properties of the material. Finally, it was observed that BNNT incorporation enhance the adherence and proliferation of human tenocyte cells in vitro .

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Section: Resultsmentioning

confidence: 99%

Boron Nitride Nanotube Addition Enhances the Crystallinity and Cytocompatibility of PVDF-TrFE

et al. 2019

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“…7,25,36 The distribution of conductive fillers in the elastomer has a significant impact on the performance of the strain sensors. 11,20,30,37 The detection range and sensitivity of the flexible strain sensors can be regulated and controlled by adjusting the distribution of conductive fillers in the elastomer. Generally, the conductive filler is mainly distributed in the elastomer or coated on the surface of the elastomer.…”

Section: Introductionmentioning

confidence: 99%

Use of Surface Penetration Technology to Fabricate Superhydrophobic Multifunctional Strain Sensors with an Ultrawide Sensing Range

Yao

Peng

et al. 2021

ACS Appl. Mater. Interfaces

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Flexible sensors with wide sensing ranges require responsiveness under tiny and large strains. However, the development of strain sensors with wide detection ranges is still a great challenge due to the conflict between the tiny strain requirements of sparse conductive networks and the large strain requirement of dense conductive networks. Herein, we present a facile method for fabricating a gradient conductive network composed of sparse and dense conductive networks. The surface penetration technology in which carbon black (CB) penetrated from the natural rubber latex (NRL) glove surface to the interior was used to fabricate a gradient conductive network. The prolonged immersion time from 1 to 30 min caused the penetration depth of CB to increase from 2 to 80 μm. Moreover, CB formed hierarchical rough micro- and nanoscale structures, creating a superhydrophobic surface. The gradient conductive network of sensors produced an ultrawide detection range of strain (0.05–300%) and excellent reliability and reproducibility. The sensors can detect a wide range of human motions, from tiny (wrist pulse) to large (joint movements) motion monitoring. The flexible sensors attached to a flexible basement can be used to detect pressure in a wide detection range (1.7–2900 kPa). Pressure responsiveness was used to detect the weight, sound pressure, and dripping of tiny droplets. The sensor showed an excellent response to organic solvents, and the response intensity increased with the increasing swelling degree of the solvent for NRL.

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“…A combined technique of extrusion assisted by supercritical fluid (SCF) was used to develop nanoscale composite materials. 17 To improve the solubility of insoluble drugs, Chen et al modified rapid expansion of supercritical solution (RESS) to establish a process that can continuously produce nanosized lonidamine. 18 Most of these methods were adopted to produce nanoparticles successfully; however, all such methods require rigorous and demanding conditions such as special experimental equipment, high pressure, and high-energy consumption.…”

Section: Introductionmentioning

confidence: 99%

“…Situ et al obtained liposomes of nanometer size (66.19 nm) by supercritical (SC) carbon dioxide at an SC–CO 2 pressure of 14 MPa achieving encapsulation of bioactive ingredients for storage and control release. A combined technique of extrusion assisted by supercritical fluid (SCF) was used to develop nanoscale composite materials . To improve the solubility of insoluble drugs, Chen et al modified rapid expansion of supercritical solution (RESS) to establish a process that can continuously produce nanosized lonidamine .…”

Section: Introductionmentioning

confidence: 99%

Fluid Dynamic and Heat Transfer Simulations of Solid Hollow Fiber Cooling Crystallizer for Continuous Synthesis of Drug Nanoparticles

Gao

Wang

Liu

et al. 2020

Crystal Growth & Design

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The study illustrates for the first time a computational fluid dynamics (CFD)-based heat transfer model for the novel solid hollow fiber cooling crystallizer (SHFCC) that can produce drug nanoparticles in a continuous and controllable manner. In the SHFCC device, a mixture of water and ethylene glycol is circulated through the shell side of a solid hollow fiber module to rapidly cool the drug solution flowing in the hollow fiber lumen side to produce rapid temperature reduction-induced drug crystals. In this study, a three-dimensional model of an SHFCC device was first constructed using the software GAMBIT and then was exported to the CFD software-FLUENT after the meshing and optimization process, to understand and optimize hydrodynamic and heat transfer characteristics of this device theoretically. The variation of lumen-side flow rate was investigated using CFD to explore the influences of residence time, flow rate, and cooling temperature on the crystal size distribution. Variations of the shell-side temperature and flow rate were also simulated to reveal the heat transfer efficiency of the SHFCC module and understand the phenomenon of temperature reduction-induced precipitation and crystal formation. Actual experimental results were also obtained to investigate the accuracy and usefulness of the CFD model. This research suggested the feasibility and advantages of a combination of CFD simulation with experiments to optimize and control drug crystallization process in the novel SHFCC device to meet the needs of modern pharmaceutical industry.

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Processing of nanocomposites using supercritical fluid assisted extrusion for stress/strain sensing applications

Cited by 23 publications

References 38 publications

Boron Nitride Nanotube Addition Enhances the Crystallinity and Cytocompatibility of PVDF-TrFE

Boron Nitride Nanotube Addition Enhances the Crystallinity and Cytocompatibility of PVDF-TrFE

Use of Surface Penetration Technology to Fabricate Superhydrophobic Multifunctional Strain Sensors with an Ultrawide Sensing Range

Fluid Dynamic and Heat Transfer Simulations of Solid Hollow Fiber Cooling Crystallizer for Continuous Synthesis of Drug Nanoparticles

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