Electrical and Thermal Characterization of Electrospun PVP Nanocomposite Fibers

Polyvinylpyrrolidone (PVP) solutions incorporated with multiwall carbon nanotubes (MWCNTs) were electrospun at various weight percentages, and then the electrical resistance and some thermal properties of these nanocomposite fibers were determined using a high-accuracy electrical resistance measurement device. During the electrospinning process, system and process parameters, such as concentrations, applied voltage, tip-to-collector distance, and pump speeds, were optimized to receive the consistent nanocomposite fibers. When polymers are used in many industrial applications, they require high electrical and thermal conductivities. Most polymers exhibit low electrical conductivity values; however, in the presence of conductive inclusions, the electrical resistance of the MWCNT fibers was reduced from 50 MΩ to below 5 MΩ, which may be attributed to the higher electrical conductivities of these nanoscale inclusions and fewer voids under the applied loads. This study may open up new possibilities in the field for developing electrically conductive novel nanomaterials and devices for various scientific and technological applications.

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Dielectric Properties of Electrospun PVP and PAN Nanocomposite Fibers at Various Temperatures

Journal of Nanotechnology in Engineering and Medicine ◽

10.1115/1.4002533 ◽

2010 ◽

Vol 1 (4) ◽

Cited By ~ 10

Author(s):

W. S. Khan ◽

R. Asmatulu ◽

M. M. Eltabey

Keyword(s):

Dielectric Properties ◽

Multiwall Carbon Nanotubes ◽

Dielectric Materials ◽

Industrial Applications ◽

Thin Layers ◽

Dielectric Studies ◽

Capacitance Bridge ◽

Nanocomposite Fibers ◽

Polymeric Solutions ◽

Multiwall Carbon

Dielectric properties of electrospun polyvinylpyrrolidone (PVP) and polyacrylonitrile (PAN) nanocomposite fibers were determined as a function of temperature and concentration in order to explore the possibility of using them as dielectric materials in different industrial applications. Multiwall carbon nanotubes and Ni0.6Zn0.4Fe2O4 (NiZn ferrite) were individually dispersed into the polymeric solutions of PVP and PAN and were then electrospun at various conditions. Thin layers of films were placed between two parallel Al electrode plates of the capacitance bridge prior to the measurements. We determined that nanoscale inclusions and temperature mainly affect the dielectric properties of the nanocomposite fibers. The dielectric studies can provide critical information for many electronic applications, such as loss of a cable insulator, the impedance of a substrate, and the frequency of a dielectric resonator.

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Noncontact thermal characterization of multiwall carbon nanotubes

Journal of Applied Physics ◽

10.1063/1.1854725 ◽

2005 ◽

Vol 97 (6) ◽

pp. 064302 ◽

Cited By ~ 64

Author(s):

Xinwei Wang ◽

Zhanrong Zhong ◽

Jun Xu

Keyword(s):

Carbon Nanotubes ◽

Multiwall Carbon Nanotubes ◽

Thermal Characterization ◽

Multiwall Carbon

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Thermal Characterization of Electrical Resistance of 3D printed sensors

2021 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) ◽

10.1109/i2mtc50364.2021.9459968 ◽

2021 ◽

Author(s):

Mattia Alessandro Ragolia ◽

Attilio di Nisio ◽

Anna Maria Lanzolla ◽

Gianluca Percoco ◽

Marco Scarpetta ◽

...

Keyword(s):

Electrical Resistance ◽

Thermal Characterization ◽

Printed Sensors ◽

3D Printed

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Thermal Characterization of Cu∕CoFe Multilayer for Giant Magnetoresistive Head Applications

Journal of Heat Transfer ◽

10.1115/1.2136916 ◽

2005 ◽

Vol 128 (2) ◽

pp. 113-120 ◽

Cited By ~ 5

Author(s):

Y. Yang ◽

R. M. White ◽

M. Asheghi

Keyword(s):

Electrical Resistance ◽

Multilayer Structure ◽

Giant Magnetoresistance ◽

Room Temperature ◽

Thermal Characterization ◽

Disk Drive ◽

Multilayer Structures ◽

Large Decrease ◽

Resistance Thermometry

Giant magnetoresistance (GMR) head technology is one of the latest advancements in the hard disk drive (HDD) storage industry. The GMR head multilayer structure consists of alternating layers of extremely thin metallic ferromagnetic and nonmagnetic films. A large decrease in the electrical resistivity from antiparallel to parallel alignment of the film magnetizations is observed, known as the GMR effect. The present work characterizes the in-plane electrical and thermal conductivities of Cu∕CoFe GMR multilayer structures in the temperature range of 50K to 340K using Joule-heating and electrical resistance thermometry on suspended bridges. The thermal conductivity of the GMR layer monotonically increases from 25Wm−1K−1 (at 55K) to nearly 50Wm−1K−1 (at room temperature). We also report a GMR ratio of 17% and a large magnetothermal resistance effect (GMTR) of 25% in the Cu∕CoFe multilayer structure.

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Synthesis and Characterization of Quantum Dot-Loaded Poly(lactic-co-glycolic) Acid Nanocomposite Fibers by an Electrospinning Process

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2017.13357 ◽

2017 ◽

Vol 17 (4) ◽

pp. 2720-2723

Author(s):

Seshadri Reddy Ankireddy ◽

Jongsung Kim

Keyword(s):

Quantum Dot ◽

Glycolic Acid ◽

Electrospinning Process ◽

Synthesis And Characterization ◽

Nanocomposite Fibers

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Structural and thermal characterization of multiwall carbon nanotubes (MWCNTs) / aluminum (Al) nanocomposites

Composites Part B Engineering ◽

10.1016/j.compositesb.2018.06.019 ◽

2018 ◽

Vol 151 ◽

pp. 232-236 ◽

Cited By ~ 6

Author(s):

S. Saadallah ◽

A. Cablé ◽

S. Hamamda ◽

K. Chetehouna ◽

M. Sahli ◽

...

Keyword(s):

Carbon Nanotubes ◽

Multiwall Carbon Nanotubes ◽

Thermal Characterization ◽

Multiwall Carbon

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Effect of electrospinning parameters on the characterization of PLA/HNT nanocomposite fibers

Journal of Materials Research ◽

10.1557/jmr.2010.0122 ◽

2010 ◽

Vol 25 (5) ◽

pp. 857-865 ◽

Cited By ~ 38

Author(s):

Ahmed H. Touny ◽

Joseph G. Lawrence ◽

Andrew D. Jones ◽

Sarit B. Bhaduri

Keyword(s):

Electron Microscopy ◽

Biomedical Applications ◽

Solution Concentration ◽

Halloysite Nanotubes ◽

Electrospinning Process ◽

X Ray Diffraction ◽

X Ray ◽

Nanocomposite Fibers ◽

Scanning Electron

Halloysite nanotubes (HNT) reinforced polylactic acid (PLA) nanocomposite fibers were produced using an electrospinning approach for biomedical applications. The PLA/HNT nanocomposite fibers were characterized using x-ray diffraction (XRD) and scanning electron microscopy (SEM). The various factors such as type of solvent, solution concentration, HNT loading and feed rate, affecting the electrospinning process, and the morphology of the nanofibers were investigated, and the optimum values for these parameters are suggested. The results indicated that the addition of dimethylformamide (DMF) to chloroform facilitated the electrospinning process because of the improvement in electrical conductivity and viscosity of the solution. Nanometer-sized fibers were obtained by the addition of HNT to PLA. HNT loadings had a significant effect on the morphology of the nanofibers. Bead-free fibers were produced at feed rates between 1 and 4 mL/h.

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Development of metal–graphene-filled hybrid composites: Characterization of mechanical, thermal, and electrical properties

Journal of Composite Materials ◽

10.1177/0021998318812928 ◽

2018 ◽

Vol 53 (24) ◽

pp. 3363-3376 ◽

Cited By ~ 2

Author(s):

Saeed Doagou Rad ◽

Aminul Islam ◽

Ammar Alnasser

Keyword(s):

Thermal Conductivity ◽

Hybrid Composites ◽

Polyamide 6 ◽

Graphene Nanoplatelets ◽

Electrically Conductive ◽

Electron Microscopies ◽

Annealing Step ◽

Electrical Conductivities ◽

Thermal And Electrical Properties

Production and properties of thermally and electrically conductive polymeric composites containing conductive micro and nano fillers are investigated. Mechanical, electrical, and thermal properties of the produced nano and hybrid Polyamide 6–based composites filled with graphene nanoplatelets and metal microfibers are studied. The influence of nanofiller content and geometrical characteristics on the thermal conductivity of the composites are studied through experiments and finite element modeling. The results show the influence of nanoplatelets aspect ratio and lateral dimension on the thermal conductivity of the composites. Furthermore, combination of graphene nanoplatelets and metallic micro-scale fillers leads to significant improvements in thermal and electrical conductivities. In fact, graphene nanoplatelets act as conductive bridges in minuscule gaps to increase the number of contacts in the constructed network. The combination of the two different fillers increased the mechanical properties up to 120% compared to the metal reinforced composites, indicating stronger interfaces between the fillers and polymeric matrix. Rheological investigations also confirm the effectiveness of hybridization. Furthermore, the influence of annealing on the conductivities of the specimens are studied. Adding an annealing step following the nanofiller inclusion within the composites resulted in 151 and 72% enhancement in the thermal and electrical conductivities, respectively. Stress relaxation and reorientation of metal fibers in combination with additionally constructed nanofiller networks have been attributed to the observed enhancements. The involved mechanisms in the observed behaviors are studied using optical and electron microscopies.

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