scholarly journals Enhanced thermal conductivity in immiscible polyimide blend composites with needle-shaped ZnO particles

RSC Advances ◽  
2017 ◽  
Vol 7 (25) ◽  
pp. 15492-15499 ◽  
Author(s):  
Shoya Uchida ◽  
Tomoya Murakami ◽  
Takeru Iwamura ◽  
Ryohei Ishige ◽  
Shinji Ando
Keyword(s):  
Thermal Conductivity ◽  
Composite Films ◽  
High Thermal Conductivity ◽  
Zno Particles ◽  
Out Of Plane ◽  
Plane Direction ◽  
Enhanced Thermal Conductivity

Novel composite films exhibiting high thermal conductivity along the out-of-plane direction were prepared from two types of immiscible polyimides (PIs) and needle-shaped ZnO particles.

scholarly journals Fabrication of Lignin-Based Nano Carbon Film-Copper Foil Composite with Enhanced Thermal Conductivity

Nanomaterials ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1681 ◽  
Author(s):  
Bin Luo ◽  
Mingchao Chi ◽  
Qingtong Zhang ◽  
Mingfu Li ◽  
Changzhou Chen ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Thermal Management ◽  
Copper Foil ◽  
Infrared Imaging ◽  
Carbon Film ◽  
Composite Films ◽  
Annealing Treatment ◽  
Thermal Infrared Imaging ◽  
Nano Carbon ◽  
Enhanced Thermal Conductivity

Technical lignin from pulping, an aromatic polymer with ~59% carbon content, was employed to develop novel lignin-based nano carbon thin film (LCF)-copper foil composite films for thermal management applications. A highly graphitized, nanoscale LCF (~80–100 nm in thickness) was successfully deposited on both sides of copper foil by spin coating followed by annealing treatment at 1000 °C in an argon atmosphere. The conditions of annealing significantly impacted the morphology and graphitization of LCF and the thermal conductivity of LCF-copper foil composite films. The LCF-modified copper foil exhibited an enhanced thermal conductivity of 478 W m−1 K−1 at 333 K, which was 43% higher than the copper foil counterpart. The enhanced thermal conductivity of the composite films compared with that of the copper foil was characterized by thermal infrared imaging. The thermal properties of the copper foil enhanced by LCF reveals its potential applications in the thermal management of advanced electronic products and highlights the potential high-value utility of lignin, the waste of pulping.

Modified graphene/polyimide composite films with strongly enhanced thermal conductivity

Nanoscale ◽  
2019 ◽  
Vol 11 (17) ◽  
pp. 8219-8225 ◽  
Author(s):  
Xian Wu ◽  
Haoliang Li ◽  
Kui Cheng ◽  
Hanxun Qiu ◽  
Junhe Yang
Keyword(s):  
Thermal Conductivity ◽  
Thermal Management ◽  
Composite Films ◽  
Highly Efficient ◽  
Graphene Films ◽  
Modified Graphene ◽  
Enhanced Thermal Conductivity

An effective “modified-welding” approach to prepare graphene films with excellent thermal conductivity and flexibility for highly efficient thermal management.

Preparation and characterization of surface modified boron nitride epoxy composites with enhanced thermal conductivity

RSC Advances ◽  
2014 ◽  
Vol 4 (83) ◽  
pp. 44282-44290 ◽  
Author(s):  
Jun Hou ◽  
Guohua Li ◽  
Na Yang ◽  
Lili Qin ◽  
Maryam E. Grami ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Thermal Stability ◽  
Boron Nitride ◽  
High Thermal Conductivity ◽  
Epoxy Composites ◽  
Surface Modified ◽  
Enhanced Thermal Conductivity ◽  
Electrical Insulation Properties

The fabricated surface modified boron nitride epoxy composites exhibit high thermal conductivity, superior thermal stability and good mechanical properties while retaining good electrical insulation properties.

Increasing Efficiencies of Thermoelectric Devices Through Angular Interface Geometries

2009 ◽  
Author(s):  
D. P. Sellan ◽  
C. H. Amon
Keyword(s):  
Thermal Conductivity ◽  
Figure Of Merit ◽  
Equation Model ◽  
Boltzmann Transport ◽  
Thermoelectric Efficiency ◽  
Thermoelectric Figure ◽  
Subsequent Increase ◽  
Acoustic Mismatch ◽  
Out Of Plane ◽  
Plane Direction

The phonon Boltzmann transport equation model is used to evaluate the reduction of out-of-plane thermal conductivity and subsequent increase in thermoelectric figure of merit when an angular interface is patterned between a germanium thin-film and silicon substrate. According to the acoustic mismatch model, the angular structure reduces the out-of-plane thermal conductivity by spatially redistributing phonons traveling in the out-of-plane direction. Simulation results demonstrate a 43% reduction in out-of-plane thermal conductivity when operating in the fully ballistic regime. This decrease in phononic thermal conductivity would result in an increase of intrinsic thermoelectric efficiency by a factor of 1.75.

scholarly journals Enhanced thermal conductivity of nanocomposites with MOF-derived encapsulated magnetic oriented carbon nanotube-grafted graphene polyhedra

RSC Advances ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 3357-3365 ◽  
Author(s):  
Xu Li ◽  
Ya Li ◽  
Md Mofasserul Alam ◽  
Peng Chen ◽  
Ru Xia ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotube ◽  
Metal Organic Framework ◽  
High Thermal Conductivity ◽  
Metal Organic ◽  
Magnetic Carbon ◽  
Enhanced Thermal Conductivity ◽  
Organic Framework

A high-thermal conductivity filler of magnetic carbon nanotube-grafted graphene polyhedra is exploited via annealing of a metal–organic framework (ZIF-67).

Performance Evaluation of a High Thermal Conductivity Fuel With Graphene Additives During the LBLOCA

2012 ◽  
Author(s):  
Seung Won Lee ◽  
Hyoung Tae Kim ◽  
In Cheol Bang
Keyword(s):  
Thermal Conductivity ◽  
Cross Section ◽  
Power Reactor ◽  
High Thermal Conductivity ◽  
Absorption Cross ◽  
Fuel Rod ◽  
Graphene Composite ◽  
Safety Margins ◽  
Composite Fuel ◽  
Enhanced Thermal Conductivity

The fuel rod performance of enhanced thermal conductivity UO2/graphene composites is investigated through a LBLOCA analysis. The benefits increased monotonically with increasing thermal conductivity in terms of reduced fuel center temperature and PCT. The performance of the UO2/graphene composite fuel is assessed in OPR-1000 (Optimized Power Reactor-1000) during a LBLOCA. Graphene can be a promising material for developing advanced nuclear fuel because of its property about the high thermal conductivity and low absorption cross section. The results confirm a LBLOCA performance related to PCT of the UO2/graphene composite fuel and its potential while maintaining large safety margins.

scholarly journals Functionalized Multiwalled Carbon Nanotube-Reinforced Polyimide Composite Films with Enhanced Mechanical and Thermal Properties

2019 ◽  
Vol 2019 ◽  
pp. 1-12 ◽  
Author(s):  
Min Chao ◽  
Yanming Li ◽  
Guanglei Wu ◽  
Zhenjun Zhou ◽  
Luke Yan
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotube ◽  
Composite Film ◽  
Composite Films ◽  
Conductive Filler ◽  
Filler Loading ◽  
Multiwalled Carbon Nanotube ◽  
High Thermal Conductivity ◽  
Mechanical And Thermal Properties ◽  
Multiwalled Carbon

Polyimide- (PI-) based nanocomposites containing the 4,4′-diaminodiphenyl ether- (ODA-) modified multiwalled carbon nanotube (MWCNT) filler were successfully prepared. The PI/MWCNTs-ODA composite films exhibit high thermal conductivity and excellent mechanical property. The optimal value of thermal conductivity of the PI/MWCNTs-ODA composite film is 0.4397 W/mK with 3 wt.% filler loading, increased by 221.89% in comparison with that of the pure PI film. In addition, the tensile strength of the PI/MWCNTs-ODA composite film is 141.48 MPa with 3 wt.% filler loading, increased by 20.74% in comparison with that of the pure PI film. This work develops a new strategy to achieve a good balance between the high thermal conductivity and excellent mechanical properties of polyimide composite films by using functionalized carbon nanotubes as an effective thermal conductive filler.

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