Erratum: “Charge measurement of electropsun polyvinylidene fluoride fibers using a custom-made Faraday bucket” [Rev. Sci. Instrum. 91, 075107 (2020)]

Gade, Harshal; Parsa, Nitin; Roberts, O Steve; Reneker, Darell H

doi:10.1063/5.0021924

Cited by 3 publications

(4 citation statements)

References 1 publication

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Section: Experimental and Methodsmentioning

confidence: 99%

“…A custom fabricated Faraday Bucket 30 was used to measure the charge potential of the fiber yarn and membrane samples. The Faraday Bucket and measurement procedures were discussed in the literature 30 . A few modifications were made to the Faraday bucket to accurately position the sample in and out of the bucket and to directly measure the charge present on the sample using a Keithley 6514 system electrometer (Keithley Instruments, Solon, OH, USA) instead of using a voltmeter.…”

Section: Experimental and Methodsmentioning

confidence: 99%

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Achievement of high surface charge in poly(vinylidene fluoride) fiber yarns through dipole orientation during fabrication

Bokka

Reneker

2022

J of Applied Polymer Sci

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Electrospun fiber materials are of scientific interest for use in multiple application areas. Charged fiber structures show enhanced properties as desired for some of these applications. One factor influencing the charge on the fiber structure that has not been explored is fiber alignment. Electrospun fiber structures, such as membranes, typically consist of randomly oriented fibers. Structural properties of the membranes such as mechanical strength are known to be affected by the random orientation of the fibers. It is suspected that fiber orientation may also affect the charge capacity of charged fiber structures. A few approaches to form electrospun yarns have been reported. Some of these approaches can also cause fibers to preferentially align along the yarn axis instead of assembling into a random structure. In this work, a rotating metal cone was used to collect Poly(vinylidene fluoride) electrospun fibers from which stretched yarns were drawn and twisted into yarns. The alignment of the fibers in the yarns was controllable to a degree that allowed exploration of the effect of alignment on charge. Long continuous oriented or random yarns of relatively uniform thickness were produced at a rate of about 10 m/h. The yarns were polarized by methods of heating, stretching, and poling. The results show that the fiber yarn formation process endows more charges to the fibers compared to the normal fiber membrane electrospinning and post polarization. This provides a facile route for the preparation of enhanced chargefunctionalized fiber structures for a wide range of applications.

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Section: Experimental and Methodsmentioning

confidence: 99%

Section: Experimental and Methodsmentioning

confidence: 99%

Achievement of high surface charge in poly(vinylidene fluoride) fiber yarns through dipole orientation during fabrication

Bokka

Reneker

2022

J of Applied Polymer Sci

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“…[30,31] Compared to TDTR, [32,33] FDTR setups are inexpensive, simpler to implement, and offer the possibility of characterizing multiple material properties based on their multi-modulation frequency approach. [31,34] Flexibility in the modulation frequency also allows for thermal measurements on samples with a large span of thermal conductivities. [36,37] In the FDTR technique (Figure 1), the sample is covered with a thin metallic transducer layer (gold in this work).…”

Section: Local Thermal Conductivity Imagingmentioning

confidence: 99%

Microscale Imaging of Thermal Conductivity Suppression at Grain Boundaries

et al. 2023

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Grain‐boundary engineering is an effective strategy to tune the thermal conductivity of materials, leading to improved performance in thermoelectric, thermal‐barrier coatings, and thermal management applications. Despite the central importance to thermal transport, a clear understanding of how grain boundaries modulate the microscale heat flow is missing, owing to the scarcity of local investigations. Here, thermal imaging of individual grain boundaries is demonstrated in thermoelectric SnTe via spatially resolved frequency‐domain thermoreflectance. Measurements with microscale resolution reveal local suppressions in thermal conductivity at grain boundaries. Also, the grain‐boundary thermal resistance – extracted by employing a Gibbs excess approach – is found to be correlated with the grain‐boundary misorientation angle. Extracting thermal properties, including thermal boundary resistances, from microscale imaging can provide comprehensive understanding of how microstructure affects heat transport, crucially impacting the materials design of high‐performance thermal‐management and energy‐conversion devices.

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“…Gade et al measured the residual charge amount (Q r ) in the electrospun nonwoven polyvinylidene fluoride fiber mat by a custom-made Faraday cup. [24] However, considering the involvement of the in-process solvent evaporation and the structural formation of random mats for SE-enabled scaffolds, charge measurements for an SE process furnish limited insights into the charge polarity and amount in MEW-enabled scaffolds. In our previous work, the polarity of scaffolds collected on conductive and non-conductive substrates are determined upon approach, indicating an opposite charge polarity between the scaffold printed on conductive and non-conductive substrates.…”

Section: Introductionmentioning

confidence: 99%

Quantitative Investigation into the Design and Process Parametric Effects on the Fiber‐Entrapped Residual Charge for a Polymer Melt Electrohydrodynamic Printing Process

Cao

Zhang

Zaeri

et al. 2022

Macro Materials & Eng

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The printing accuracy of the melt electrowriting (MEW) process is adversely affected by residual charge entrapped within the printed fibers. To mitigate this effect, the residual charge amount (Q r ) must first be accurately determined. In this study, Q r is measured by a commercial electrometer at a nanocoulomb scale for MEW-enabled scaffolds. Based on this enabling measurement, the effects of various design parameters (including substrate surface conductivity 𝝈, printing time t, layer number N), and process parameters (including voltage U, translational stage speed v, and material temperature T m ), on Q r are investigated. An increase of 𝝈 or decrease of N helps to decrease Q r . The effects of different process parameters on the residual charge can be either dependent or independent of fiber morphologies. Moreover, the fiber-morphology dependent and independent effect can be either synergistic (U and T m ) or antagonistic (e.g., v) for different process parameters. Under same conditions, Q r in the interweaving scaffold design is generally smaller than that in the non-interweaving scaffold design. These results help to furnish necessary insights into the charge dissipation process for a melt-based electrohydrodynamic printing process while providing a systematic methodology to mitigate the residual charge accumulation.

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Erratum: “Charge measurement of electropsun polyvinylidene fluoride fibers using a custom-made Faraday bucket” [Rev. Sci. Instrum. 91, 075107 (2020)]

Cited by 3 publications

References 1 publication

Achievement of high surface charge in poly(vinylidene fluoride) fiber yarns through dipole orientation during fabrication

Achievement of high surface charge in poly(vinylidene fluoride) fiber yarns through dipole orientation during fabrication

Microscale Imaging of Thermal Conductivity Suppression at Grain Boundaries

Quantitative Investigation into the Design and Process Parametric Effects on the Fiber‐Entrapped Residual Charge for a Polymer Melt Electrohydrodynamic Printing Process

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