Bad luck for the scocceroos
Ok, here are some thoughts: Next big graphene Show: Dresden, Germany, June 26:
http://www.grapheneconf.com/2018/IForum.php
ARC Graphene Hub and Universtiy of Adelaide:
http://phantomsfoundation.com/GRAPHENECONF/2018/Abstracts/Grapheneconf2018_NINE_MD_JULKER_192.pdf
Graphene Based High-performance Sound Absorbers
Md J. Nine1,2, Md Ayub3, Anthony C. Zander3, Diana N.H. Tran1,2, Benjamin S. Cazzolato3, Dusan losic1,2
1School of Chemical Engineering, The University of Adelaide, Adelaide, SA 5005, Australia 2ARC Research Hub for Graphene Enabled Industry Transformation, The University of Adelaide, Adelaide, SA 5005, Australia 3School of Mechanical Engineering, The University of Adelaide, Adelaide, SA 5005, Australia [email protected]; [email protected] Environmental noise has recognized impacts on human’s psychological and physiological health including arterial hypertension, myocardial infarction, and stroke.[1] To mitigate noise pollution, different fibrous and porous acoustic absorbing materials were explored and commercially used which are often limited by low-absorption over a broad frequency range, delicacy, excessive weight and thickness, poor moisture insulation, high temperature instability.[2] To address these limitations, we designed a new type of high-efficient absorbing material using graphene oxide (GO) selfassembled into a skeleton of melamine foam (Fig. 1). The fabricated lamella structure exhibits ≈60.3% enhancement over a broad absorption band between 128 and 4000 Hz (≈100% at lower frequencies) compared to the commercial melamine foam (MF) (Fig. 2a). This enhanced sound dissipation is explained by unique GOlamella structures on melamine skeleton that provide air flow resistance, tortuosity against sound wave propagation and internal reflection (Fig. 2d. The acoustic absorption is found to be structure dependent regardless of the density. In addition, the prepared structures are mechanically robust, provides moisture/mist insulation and fire retardancy (Fig. 2b-c).[3] The fabrication of the new type of sound absorber is scalable and can be adapted for extensive applications in commercial, residential, and industrial building structures.
References [1] M. Sørensen, et al, Environmental Health perspectives 121(2) 2013, 217-222. [2] J.P. Arenas, M.J. Crocker, Sound & vibration 44 (7) (2010) 12-18. [3] Md J. Nine, Md Ayub, A, C. Zander, D. N.H. Tran, B. S. Cazzolato, D. Losic, Advanced Functional Materials 2017, 27(46),1703820, Figures
Figure 1: Fabrication of lamella structure. a-b) self-assembly process. c) Melamine foam (MF). d-e) Interconnected GO-into MF.
Figure 2: Sound absorption and other functional properties. a) Comparative sound absorption co-efficient. b) Super-hydrophobicity and moisture insulation. c) Fire-retardancy. d) Mechanism of enhanced sound absorption.
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Skeleton explains the use of:
The application of “curved graphene” in large industrial Ultracapacitor cells has been shown to yield an increase of up 40% in energy storage capabilities while retaining Skeleton’s cells’ excellent power capabilities.
References: http://phantomsfoundation.com/GRAPHENECONF/2018/Abstracts/Grapheneconf2018_Pohlmann_Sebastian_6.pdf
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For the UoA Sound of silence with added fire stop take a look at:
https://www.melaminharzschaum.de/
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For thoses who wanna take a second look at WG comment on Formula 1 Brakes:
https://www.motorsport-total.com/formel-1/news/formel-1-technik-die-bremsen-13031117
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and for those who wanna relax:
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All the best,
L
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