Fabrication of robust and highly thermally conductive nanofibrillated cellulose/graphite nanoplatelets composite papers

2017 ◽  
Vol 138 ◽  
pp. 179-185 ◽  
Author(s):  
Genghui Li ◽  
Xiaojuan Tian ◽  
Xiuwen Xu ◽  
Chen Zhou ◽  
Jiaye Wu ◽  
...  
Keyword(s):  
Nanofibrillated Cellulose ◽  
Graphite Nanoplatelets ◽  
Thermally Conductive

scholarly journals Ball-Milled Recycled Lead-Graphite Pencils as Highly Stretchable and Low-Cost Thermal-Interface Materials

Polymers ◽  
2018 ◽  
Vol 10 (7) ◽  
pp. 799 ◽  
Author(s):  
Chun-An Liao ◽  
Yee-Kwan Kwan ◽  
Tien-Chan Chang ◽  
Yiin-Kuen Fuh
Keyword(s):  
Low Cost ◽  
Exfoliated Graphite ◽  
Thermal Interface Materials ◽  
Graphite Nanoplatelets ◽  
Thermal Interface ◽  
Thermally Conductive ◽  
Highly Stretchable ◽  
Exfoliated Graphite Nanoplatelets ◽  
Interface Materials ◽  
Thermal Conductivities

A simple and sustainable production of nanoplatelet graphite at low cost is presented using carbon-based materials, including the recycled lead-graphite pencils. In this work, exfoliated graphite nanoplatelets (EGNs), ball-milled exfoliated graphite nanoplatelets (BMEGNs) and recycled lead-graphite pencils (recycled 2B), as well as thermally cured polydimethylsiloxane (PDMS), are used to fabricate highly stretchable thermal-interface materials (TIMs) with good thermally conductive and mechanically robust properties. Several characterization techniques including scanning electron microscopy (SEM) and thermogravimetric analysis (TGA) showed that recycled nanoplatelet graphite with lateral size of tens of micrometers can be reliably produced. Experimentally, the thermal conductivity was measured for EGNs, BMEGNs and recycled 2B fillers with/without the effect of ball milling. The in-plane thermal conductivities of 12.97 W/mK (EGN), 13.53 W/mK (recycled 2B) and 14.56 W/mK (BMEGN) and through-plane thermal conductivities of 0.76 W/mK (EGN), 0.84 W/mK (recycled 2B) and 0.95 W/mK (BMEGN) were experimentally measured. Anisotropies were calculated as 15.31, 15.98 and 16.95 for EGN, recycled 2B and BMEGN, respectively. In addition, the mechanical robustness of the developed TIMs is such that they are capable of repeatedly bending at 180 degrees with outstanding flexibility, including the low-cost renewable material of recycled lead-graphite pencils. For heat dissipating application in high-power electronics, the TIMs of recycled 2B are capable of effectively reducing temperatures to approximately 6.2 °C as favorably compared with thermal grease alone.

Effect of exfoliated graphite nanoplatelets on thermal and heat deflection properties of kenaf polypropylene hybrid nanocomposites

2016 ◽  
Vol 36 (9) ◽  
pp. 877-889 ◽  
Author(s):  
Christopher Igwe Idumah ◽  
Azman Hassan
Keyword(s):  
Electron Microscopy ◽  
Thermal Conductivity ◽  
Thermal Stability ◽  
Heat Dissipation ◽  
Hybrid Nanocomposites ◽  
Exfoliated Graphite ◽  
Graphite Nanoplatelets ◽  
Uniform Dispersion ◽  
Thermally Conductive ◽  
And Behavior

Abstract Exfoliated graphite nanoplatelet (GNP) polypropylene (PP)/kenaf fiber (KF) hybrid nanocomposites (PP/KF/MAPP/GNP collectively presented as PKMG) were developed through melt extrusion using a co-rotating screw speed extruder. The loadings of GNPs in nanocomposites were varied from 1–5 phr and characterized for thermal conductivity, stability and behavior, morphology, and heat deflection temperature (HDT). Results revealed increasing effective thermal conductivity with increasing inclusion of GNP. This behavior was attributed to the formation of thermally conductive, interconnected, sheets of GNP which enhanced heat dissipation. Thermal stability analysis revealed high thermal residue content at 3 phr loading attributed to uniform dispersion of GNP sheets in polymer matrix and the formation of enhanced oxygen-barrier due to effective char formation. Results also revealed enhanced HDT (0.46 MPa/1.8 MPa) with increasing incorporation of GNP ascribed to high modulus and thermal stability of GNP sheets. This implies capability of material to sustain loading at high temperatures without losing its rigidity. Thermal behavior revealed increased crystallization temperature and reduced degree of crystallization with slight increase in melting temperature in the range of 2–5°C. Morphological analysis using transmission electron microscopy (TEM) and field emission scanning electron microscopy (FESEM) revealed exfoliated and uniform dispersion of graphene in matrix polymer at 3 phr loading.

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.

Anisotropic thermally conductive flexible films based on nanofibrillated cellulose and aligned graphene nanosheets

2016 ◽  
Vol 4 (2) ◽  
pp. 305-314 ◽  
Author(s):  
Na Song ◽  
Dejin Jiao ◽  
Peng Ding ◽  
Siqi Cui ◽  
Shengfu Tang ◽  
...  
Keyword(s):  
Graphene Nanosheets ◽  
Nanofibrillated Cellulose ◽  
Hybrid Films ◽  
Graphene Nanosheet ◽  
Flexible Films ◽  
Thermally Conductive ◽  
Thermal Conductivities

The nanofibrillated cellulose/graphene nanosheet hybrid films possessed significantly anisotropic thermal conductivities. The anisotropy originated from the alignment of graphene nanosheets, which can lead to different thermal resistances along the in-plane and through-plane directions.

Structural design of multilayer thermally conductive nanofibrillated cellulose hybrid film with electrically insulating and antistatic properties

2018 ◽  
Vol 6 (26) ◽  
pp. 7085-7091 ◽  
Author(s):  
Na Song ◽  
Haidong Pan ◽  
Xiaofei Liang ◽  
Donglei Cao ◽  
Liyi Shi ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Structural Design ◽  
Heat Dissipation ◽  
Hybrid Film ◽  
Nanofibrillated Cellulose ◽  
Thermal Interface Material ◽  
Environment Friendly ◽  
Thermal Interface ◽  
Thermally Conductive

We fabricate a thermally conductive, electrically insulating and environment-friendly composite as a thermal interface material (TIM) with excellent tensile strength for heat dissipation.

Life cycle assessment of nanocomposites made of thermally conductive graphite nanoplatelets

2014 ◽  
Vol 19 (6) ◽  
pp. 1226-1237 ◽  
Author(s):  
Alfredo Pizza ◽  
Renaud Metz ◽  
Mehrdad Hassanzadeh ◽  
Jean-Louis Bantignies
Keyword(s):  
Life Cycle Assessment ◽  
Life Cycle ◽  
Graphite Nanoplatelets ◽  
Thermally Conductive

Enhanced thermal management performance of nanofibrillated cellulose composite with highly thermally conductive boron phosphide

2021 ◽  
Author(s):  
Jiajun Hu ◽  
Hongyan Xia ◽  
Xinguang Hou ◽  
Ting Yang ◽  
Kang Si ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Composite Film ◽  
Molten Salt ◽  
Thermal Management ◽  
Nanofibrillated Cellulose ◽  
Molten Salt Method ◽  
Boron Phosphide ◽  
Thermally Conductive ◽  
Conductive Fillers ◽  
Cellulose Composite

BP powders with high thermal conductivity were synthesized by a facile molten salt method and used as thermal conductive fillers to prepare nanofibrillated cellulose composite film with higher thermal conductivity.

Sign in / Sign up

Export Citation Format

Share Document