scholarly journals Plasma Electrolysis Spraying Al2O3 Coating onto Quartz Fiber Fabric for Enhanced Thermal Conductivity and Stability

2020 ◽  
Vol 10 (2) ◽  
pp. 702
Author(s):  
Aiming Bu ◽  
Yongfu Zhang ◽  
Yan Xiang ◽  
Yunjie Yang ◽  
Weiwei Chen ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Ceramic Coating ◽  
High Thermal Stability ◽  
Quartz Fiber ◽  
Al2o3 Coating ◽  
Plasma Electrolysis ◽  
Partially Observed ◽  
Thermally Conductive ◽  
Fiber Fabric ◽  
Enhanced Thermal Conductivity

This manuscript reported the synthesis of Al2O3 coating onto quartz fiber fabric by plasma electrolysis spray for enhanced thermal conductivity and stability. The nano- and micro-sized clusters were partially observed on the coating, while most coating was relatively smooth. It was suggested that the formation of a ceramic coating was followed as the nucleation-growth raw, that is, the formation of the coating clusters was dependent on the fast grow-up partially, implying the inhomogeneous energy distribution in the electrolysis plasma. The deposition of the Al2O3 coating increased the tensile strength from 19.2 to 58.1 MPa. The thermal conductivity of the coated quartz fiber was measured to be 1.17 W m−1 K−1, increased by ~45% compared to the bare fiber. The formation mechanism of the Al2O3 coating was preliminarily discussed. The thermally conductive quartz fiber with high thermal stability by plasma electrolysis spray will be widely used in flexible thermal shielding and insulation materials.

scholarly journals Plasma Electrolysis Spraying Al2O3 Nano-coating onto Quartz Fiber for Enhanced Thermal Conductivity and Stability

2019 ◽  
Author(s):  
Aiming Bu ◽  
Yongfu Zhang ◽  
Yan Xiang ◽  
Yunjie Yang ◽  
Weiwei Chen ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Ceramic Coating ◽  
Quartz Fiber ◽  
Al2o3 Coating ◽  
Plasma Electrolysis ◽  
Nano Coating ◽  
Wide Range ◽  
Partially Observed ◽  
Thermally Conductive ◽  
Enhanced Thermal Conductivity

The manuscript reported the synthesis of Al2O3 nano-coating onto quartz fiber by plasma electrolysis spray for enhanced thermal conductivity and stability. The nano- and micro-sized clusters were partially observed on the coating, while most coating was relatively smooth. It was suggested that the formation of a ceramic coating was followed as the nucleation-growth raw, that is, the formation of the coating clusters was dependent on the fast grow-up partially, implying the inhomogeneous energy distribution in the electrolysis plasma. The deposition of the Al2O3 coating increased the annealing tensile strength from 19.2 MPa to 58.1 MPa. The thermal conductivity of the coated quartz fiber was measured to be 1.17 W m-1 K-1, increased by ~45% compared to the bare fiber. The formation mechanism of the Al2O3 coating was preliminarily discussed. We believe that the thermally conductive quartz fiber with high thermal stability by plasma electrolysis spray will find a wide range of applications in industries.

Zinc Composites With Enhanced Thermal Conductivity for Use in Fused Deposition Modeling Systems

2017 ◽  
Author(s):  
Tyler J. Sonsalla ◽  
Leland Weiss ◽  
Arden Moore ◽  
Adarsh Radadia ◽  
Debbie Wood ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Fused Deposition Modeling ◽  
Waste Heat ◽  
Conductive Polymer ◽  
Three Dimensional ◽  
Sem Images ◽  
Fused Deposition ◽  
Thermally Conductive ◽  
Deposition Modeling ◽  
Enhanced Thermal Conductivity

Waste heat is a major energy loss in manufacturing facilities. Thermally conductive polymer composite heat exchangers could be utilized in the ultralow temperature range (below 200° C) for waste heat recovery. Fused deposition modeling (FDM), also known as three-dimensional (3-D) printing, has become an increasingly popular technology and presents one approach to fabrication of these exchangers. The primary challenge to the use of FDM is the low-conductivity of the materials themselves. This paper presents a study of a new polymer-Zn composite designed for enhanced thermal conductivity for usage in FDM systems. Thermal properties were assessed in addition to basic printability. Filler volume percentages were varied to study the effects on material properties. Scanning electron microscope (SEM) images were taken of the 3-D printed test pieces to determine filler orientation and filler distribution. Lastly, experimentally obtained thermal conductivity values were compared to the theoretical thermal conductivity values predicted from the Lewis-Nielsen model.

scholarly journals Enhanced thermal conductivity of graphene nanoplatelets epoxy composites

2017 ◽  
Vol 35 (2) ◽  
pp. 382-389 ◽  
Author(s):  
Lukasz Jarosinski ◽  
Andrzej Rybak ◽  
Karolina Gaska ◽  
Grzegorz Kmita ◽  
Renata Porebska ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Heat Dissipation ◽  
Electronic Devices ◽  
Graphene Nanoplatelets ◽  
Electrical Insulation ◽  
Graphene Nanocomposites ◽  
Thermally Conductive ◽  
Conductive Particles ◽  
Proper Performance ◽  
Enhanced Thermal Conductivity

Abstract Efficient heat dissipation from modern electronic devices is a key issue for their proper performance. An important role in the assembly of electronic devices is played by polymers, due to their simple application and easiness of processing. The thermal conductivity of pure polymers is relatively low and addition of thermally conductive particles into polymer matrix is the method to enhance the overall thermal conductivity of the composite. The aim of the presented work is to examine a possibility of increasing the thermal conductivity of the filled epoxy resin systems, applicable for electrical insulation, by the use of composites filled with graphene nanoplatelets. It is remarkable that the addition of only 4 wt.% of graphene could lead to 132 % increase in thermal conductivity. In this study, several new aspects of graphene composites such as sedimentation effects or temperature dependence of thermal conductivity have been presented. The thermal conductivity results were also compared with the newest model. The obtained results show potential for application of the graphene nanocomposites for electrical insulation with enhanced thermal conductivity. This paper also presents and discusses the unique temperature dependencies of thermal conductivity in a wide temperature range, significant for full understanding thermal transport mechanisms.

Flexible polyurethane/boron nitride composites with enhanced thermal conductivity

2019 ◽  
Vol 32 (3) ◽  
pp. 324-333 ◽  
Author(s):  
Ting Fei ◽  
Yanbao Li ◽  
Baocheng Liu ◽  
Chengbo Xia
Keyword(s):  
Thermal Conductivity ◽  
Boron Nitride ◽  
Thermal Management ◽  
High Stability ◽  
Heat Dissipation ◽  
Thermoplastic Polyurethane ◽  
Thermally Conductive ◽  
Mechanical Bending ◽  
Flexible Polyurethane ◽  
Enhanced Thermal Conductivity

Polymer-based composites with high thermal conductivity have great potential application as thermal management materials. This study was devoted to improving the thermal conductivity of the flexible thermoplastic polyurethane (TPU) by employing boron nitride (BN) as heat filler. We prepared flexible and thermally conductive TPU/BN composite via solution mixing and hot pressing. The thermal conductivity of the TPU/BN composite with 50 wt% BN (32.6 vol%) reaches 3.06 W/m·K, approximately 1290% enhancement compared to that of pure TPU (0.22 W/m·K). In addition, the thermal conductivity of our flexible TPU/BN composite with 30 wt% BN is almost not varied (a decrease of only 2.5%) after 100 cycles of mechanical bending, which indicates the high stability of heat conduction of our flexible TPU/BN composite under mechanical bending. The maximum tensile strength of the TPU/BN composite with 5 wt% BN is 48.9 MPa, 14% higher than that of pure TPU (43.2 MPa). Our flexible and highly thermally conductive TPU/BN composites show promise for heat dissipation in various applications in the electronics field.

An Experimental Study of Inward Solidification of Nano-Enhanced Phase Change Materials (NePCM) Inside a Spherical Capsule

2016 ◽  
Author(s):  
Min-Jie Liu ◽  
Zi-Qin Zhu ◽  
Li-Wu Fan ◽  
Zi-Tao Yu
Keyword(s):  
Thermal Conductivity ◽  
Phase Change ◽  
Phase Change Materials ◽  
Classical Problem ◽  
Transient Phase ◽  
Graphite Nanoplatelets ◽  
The Matrix ◽  
Thermally Conductive ◽  
Spherical Capsule ◽  
Enhanced Thermal Conductivity

Nano-enhanced phase change materials (PCM), referred to as NePCM, have been proposed by doping highly thermally-conductive nanofillers into matrix PCM to prepare composites that have enhanced thermal conductivity. The classical problem of inward solidification of PCM inside a spherical capsule, with applications to thermal energy storage, was revisited in the presence of nanofillers. In this work, the model NePCM samples were prepared with 1-tetradecanol (C14H30O) possessing a nominal melting point of 37 °C as the matrix PCM. Graphite nanoplatelets (GNPs) were synthesized and utilized as the nanofillers at loadings up to 1% by weight. The transient phase change and heat transfer during solidification were characterized by means of an indirect method that is based on the knowledge of transient volume shrinkage of the PCM. The experimental results showed that the total solidification time becomes shorter with increasing the loading of GNPs, in accordance to the increased effective thermal conductivity of the NePCM samples.

scholarly journals Enhanced thermal conductivity of flexible h-BN/polyimide composites films with ethyl cellulose

e-Polymers ◽  
2019 ◽  
Vol 19 (1) ◽  
pp. 305-312 ◽  
Author(s):  
Lin Liu ◽  
Siyu Shen ◽  
Yiyao Wang
Keyword(s):  
Thermal Conductivity ◽  
Composite Film ◽  
Thermal Conduction ◽  
Ethyl Cellulose ◽  
Heat Dissipation ◽  
Hexagonal Boron Nitride ◽  
Flexible Substrate ◽  
Thermally Conductive ◽  
Polyimide Composites ◽  
Enhanced Thermal Conductivity

AbstractThe present work focuses on fabricating a flexible and thermally conductive PI composite film. The PI composite film was obtained by blending hexagonal boron nitride (h-BN) combined with ethyl cellulose and 2,2’-Bis(trifluoromethyl) benzidine (TFMB) functionalized GO (TFMB- GO) in polyimide (PI). The ethyl cellulose successfully formed the thermal conduction network by promoting the dispersion of h-BN in PI matrix. Thus, the thermal conductivity of the PI composite film with ethyl cellulose could be twice than PI film without ethyl cellulose. Besides, the PI composite film containing 30 wt% of h-BN could still exhibit excellent flexibility. Moreover, the combination of TFMB-GO could increase the tensile strength of the PI composite film by up to 80%. Overall, we provided a novel idea for the preparation of flexible substrate materials with efficient heat dissipation which was convenient and possible to apply widely in the industrial production.

Enhanced thermal conductivity of epoxy/Cu-plated carbon fiber fabric composites

2017 ◽  
Vol 25 (6) ◽  
pp. 559-564 ◽  
Author(s):  
Seunggun Yu ◽  
Kyusup Park ◽  
Jang-Woo Lee ◽  
Soon Man Hong ◽  
Cheolmin Park ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Carbon Fiber ◽  
Carbon Fiber Fabric ◽  
Fabric Composites ◽  
Fiber Fabric ◽  
Enhanced Thermal Conductivity

scholarly journals Enhanced Thermal Conductivity of Polyamide-Based Nanocomposites Containing Graphene Oxide Sheets Decorated with Compatible Polymer Brushes

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 751
Author(s):  
Łukasz Łątka ◽  
Kamil Goc ◽  
Czesław Kapusta ◽  
Szczepan Zapotoczny
Keyword(s):  
Thermal Conductivity ◽  
Graphene Oxide ◽  
Polymer Brushes ◽  
Polyamide 6 ◽  
Interfacial Interactions ◽  
Elongation At Break ◽  
Conductive Additive ◽  
Thermally Conductive ◽  
Enhanced Thermal Conductivity ◽  
Poly Acrylamide

Polyamide-based nanocomposites containing graphene platelets decorated with poly(acrylamide) brushes were prepared and characterized. The brushes were grafted from the surface of graphene oxide (GO), a thermally conductive additive, using atom transfer radical polymerization, which led to the formation of the platelets coated with covalently tethered polymer layers (GO_PAAM), accounting for ca. 31% of the total mass. Polyamide-6 (PA6) nanocomposites containing 1% of GO_PAAM were formed by extrusion followed by injection molding. The thermal conductivity of the nanocomposite was 54% higher than that of PA6 even for such a low content of GO. The result was assigned to strong interfacial interactions between the brushes and PA6 matrix related to hydrogen bonding. Control nanocomposites containing similarly prepared GO decorated with other polymer brushes that are not able to form hydrogen bonds with PA6 revealed no enhancement of the conductivity. Importantly, the nanocomposite containing GO_PAAM also demonstrated larger tensile strength without deteriorating the elongation at break value, which was significantly decreased for the other coated platelets. The proposed approach enhances the interfacial interactions thanks to the covalent tethering of dense polymer brushes on 2D fillers and may be used to improve thermal properties of other polymer-based nanocomposites with simultaneous enhancement of their mechanical properties.

Highly thermally conductive UHMWPE/NG composites with the segregated structure and their application for heat spreader

2020 ◽  
pp. 089270572096564
Author(s):  
Xiao Wang ◽  
Hui Lu ◽  
Jun Chen
Keyword(s):  
Thermal Conductivity ◽  
Laser Flash ◽  
Heating Process ◽  
X Ray Diffraction ◽  
Heat Spreader ◽  
Conductive Composites ◽  
Compression Direction ◽  
Thermal Analyzer ◽  
Thermally Conductive ◽  
Plane Direction

In this work, ultra-high molecular weight polyethylene (UHMWPE)/natural flake graphite (NG) polymer composites with the extraordinary high thermal conductivity were prepared by a facile mixed-heating powder method. Morphology observation and X-ray diffraction (XRD) tests revealed that the NG flakes could be more tightly coated on the surface of UHMWPE granules by mixed-heating process and align horizontally (perpendicular to the hot compression direction of composites). Laser flash thermal analyzer (LFA) demonstrated that the thermal conductivity (TC) of composites with 21.6 vol% of NG reached 19.87 W/(m·K) and 10.67 W/(m·K) in the in-plane and through-plane direction, respectively. Application experiment further demonstrated that UHMWPE/NG composites had strong capability to dissipate the heat as heat spreader. The obtained results provided a valuable basis for fabricating high thermal conductive composites which can act as advanced thermal management materials.

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