نتایج جستجو برای: graphene platelets

تعداد نتایج: 95048  

Journal: :journal of nanostructures 2015
f. azizi h. jahangiri

graphene nanostructures were synthesized by hummer method. 1, 3, 5 and 7 wt% of graphene nanostructures were suspended in certain amount of acetone on a mechanical stirrer and stirred then added to epoxy resin. after 4 hours, solution and graphene platelets (gps) were prepared. nanostructures were characterized by x-ray diffraction (xrd), scanning electron microscopy (sem ), fourier transform i...

Journal: :ACS nano 2009
Mohammad A Rafiee Javad Rafiee Zhou Wang Huaihe Song Zhong-Zhen Yu Nikhil Koratkar

In this study, the mechanical properties of epoxy nanocomposites with graphene platelets, single-walled carbon nanotubes, and multi-walled carbon nanotube additives were compared at a nanofiller weight fraction of 0.1 +/- 0.002%. The mechanical properties measured were the Young's modulus, ultimate tensile strength, fracture toughness, fracture energy, and the material's resistance to fatigue c...

Journal: :mechanics of advanced composite structures‎ 2014
mahmood mehrdad shokrieh masood esmkhani amir reza haghighatkhah

in the present study, the effect of various weight fractions of graphene nanoplatelet (gpl) on flexural fatigue behavior of epoxy polymer has been investigated at room temperature and generally the temperature was monitored on the surface of specimen during each test. the flexural stiffness of grapheme nano-platelet/epoxy nanocomposites at 0.1, 0.25 and 0.5 wt. % as a main effective parameter o...

F. Azizi, H. Jahangiri

Graphene nanostructures were synthesized by Hummer method. 1, 3, 5 and 7 wt% of graphene nanostructures were suspended in certain amount of acetone on a mechanical stirrer and stirred then added to epoxy resin. After 4 hours, solution and Graphene platelets (GPs) were prepared. Nanostructures were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM ), Fourier transform i...

Journal: :Physical chemistry chemical physics : PCCP 2015
Farshid Pashaee Faranak Sharifi Giovanni Fanchini François Lagugné-Labarthet

In this study, tip-enhanced Raman spectroscopy (TERS) is used to characterize graphene-like and graphitic platelets composed of a few layers of graphene. Specifically, gap-mode TERS geometry provides a larger enhancement of the local electromagnetic field at the junction formed by a gold sharp tip and a gold substrate. Graphene-like platelets are deposited onto ultra-flat thin gold nanoplates u...

Journal: :Fizika tverdogo tela 2022

A theoretical model is proposed that describes the effect of graphene platelets pullout on fracture toughness ceramic/graphene composites. The dependences concentration and dimensions are calculated using a yttria-stabilized zirconia (YSZ)/graphene composite as an example. Calculations predict if from ceramic matrix dominant mechanism, then maximum achieved in case longest thinnest possible pla...

2011
Sungjin Park Jinho An Jeffrey R. Potts Aruna Velamakanni Shanthi Murali Rodney S. Ruoff

We prepared hydrazine-reduced materials from both graphite oxide (GO) particles, which were not exfoliated, and completely exfoliated individual graphene oxide platelets, and then analyzed their chemical and structural properties by elemental analysis, XPS, TGA, XRD, and SEM. Both reduced materials showed distinctly different chemical and structural properties from one another. While hydrazine ...

Journal: :Small 2010
Sungjin Park Jinho An Ji Won Suk Rodney S Ruoff

The development of new mechanical actuators that convert external stimuli such as thermal, light, electrical, or chemical energy to mechanical energy depends on the development of new materials. Reversible mechanical actuators based on carbon nanotubes (CNTs) and hydrogel polymers have suggested applications in robotics, sensors, mechanical instruments, microscopy tips, switches, and memory chi...

Journal: :Nature communications 2012
Sungjin Park Yichen Hu Jin Ok Hwang Eui-Sup Lee Leah B Casabianca Weiwei Cai Jeffrey R Potts Hyung-Wook Ha Shanshan Chen Junghoon Oh Sang Ouk Kim Yong-Hyun Kim Yoshitaka Ishii Rodney S Ruoff

Chemically modified graphene platelets, produced via graphene oxide, show great promise in a variety of applications due to their electrical, thermal, barrier and mechanical properties. Understanding the chemical structures of chemically modified graphene platelets will aid in the understanding of their physical properties and facilitate development of chemically modified graphene platelet chem...

Journal: :Nano letters 2014
Jongwon Shim Je Moon Yun Taeyeong Yun Pilnam Kim Kyung Eun Lee Won Jun Lee Ryong Ryoo David J Pine Gi-Ra Yi Sang Ouk Kim

We report a remarkably rapid method for assembling pristine graphene platelets into a large area transparent film at a liquid surface. Some 2-3 layer pristine graphene platelets temporally solvated with N-methyl-2-pyrrolidone (NMP) are assembled at the surface of a dilute aqueous suspension using an evaporation-driven Rayleigh-Taylor instability and then are driven together by Marangoni forces....

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