Qualitatively and quantitatively characterizing water adsorption of a cellulose nanofiber film using micro-FTIR spectroscopy

AbstractHeat dissipation has become increasingly important in electronics. Conventional convection cooling systems have significant material and dimensional constraints, and they have difficulty meeting the heat dissipation, miniaturization, and flexibility requirements of next-generation smart electronics. Here, we used kirigami (the traditional art of paper cutting) with a thermally conductive cellulose nanofiber film to propose a flexible cooling system through convective heat dissipation. By stretching the Amikazari (net decoration) pattern produced by kirigami and allowing air convection through its aperture at 3.0 m/s, the thermal resistance was reduced to approximately one-fifth of that without kirigami and convection. The kirigami apertures defined the outlet air velocity, resulting in a significant increase in the heat-transfer coefficient. Our kirigami heat dissipation concept enables the design of electronics using a variety of film materials as shape-variant cooling structures, which will inspire a wide range of thermal engineering and electronics applications.

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Solvent resistance of 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) treated cellulose nanofiber film for flexible electronics

Cellulose ◽

10.1007/s10570-016-0906-1 ◽

2016 ◽

Vol 23 (3) ◽

pp. 1979-1987 ◽

Cited By ~ 14

Author(s):

Yudi Kuang ◽

Gang Chen ◽

Siyi Ming ◽

Zhenfu Wu ◽

Zhiqiang Fang

Keyword(s):

Flexible Electronics ◽

Cellulose Nanofiber ◽

Solvent Resistance ◽

Nanofiber Film

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Surface modification of cellulose nanofiber film with fatty acids for developing renewable hydrophobic food packaging

Food Packaging and Shelf Life ◽

10.1016/j.fpsl.2020.100587 ◽

2020 ◽

Vol 26 ◽

pp. 100587

Author(s):

SuriyaPrakaash Lakshmi Balasubramaniam ◽

Avinash Singh Patel ◽

Balunkeswar Nayak

Keyword(s):

Fatty Acids ◽

Surface Modification ◽

Food Packaging ◽

Cellulose Nanofiber ◽

Nanofiber Film

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Enhancement of Luminance in Powder Electroluminescent Devices by Substrates of Smooth and Transparent Cellulose Nanofiber Films

Nanomaterials ◽

10.3390/nano11030697 ◽

2021 ◽

Vol 11 (3) ◽

pp. 697

Author(s):

Shota Tsuneyasu ◽

Rikuya Watanabe ◽

Naoki Takeda ◽

Kojiro Uetani ◽

Shogo Izakura ◽

...

Keyword(s):

Surface Roughness ◽

Optical Transmittance ◽

Cellulose Nanofiber ◽

Light Extraction Efficiency ◽

Light Sources ◽

Practical Applications ◽

Transparent Substrate ◽

Wide Range ◽

Substrate Properties ◽

Nanofiber Film

Powder electroluminescent (EL) devices with an electric field type excitation are surface light sources that are expected to have a wide range of practical applications, owing to their high environmental resistance; however, their low luminance has hindered their use. A clarification of the relationship between the properties of the film substrates and the electroluminescence is important to drastically improve light extraction efficiency. In this study, powder EL devices with different substrates of various levels of surface roughness and different optical transmittances were fabricated to quantitatively evaluate the relationships between the substrate properties and the device characteristics. A decrease in the surface roughness of the substrate caused a clear increase in both the current density and the luminance. The luminance was found to have a direct relationship with the optical transmittance of the substrates. The powder EL device, which was based on a cellulose nanofiber film and was the smoothest and most transparent substrate investigated, showed the highest luminance (641 cd/cm2) when 300 V was applied at 1 kHz.

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