研究目的
To investigate the role of surfactant (Pluronic? F 127) concentration on the yield and morphological characteristics of graphene nanoplatelets (GNPs) produced from the sonication of aqueous graphene suspensions.
研究成果
The research identifies a threshold in surfactant concentration (>10 wt%) and sonication power density (>340 W L?1) that enhances GNP yield through a cleavage mechanism, producing larger, multi-layer GNPs. This allows control over GNP characteristics for tailored applications, suggesting future work to decouple viscosity and concentration effects.
研究不足
The study is limited to specific surfactant (Pluronic F 127) and graphite types; effects of other surfactants or graphite sources are not explored. The exfoliation mechanisms are inferred and not directly proven; viscosity effects are not fully decoupled. High surfactant concentrations near gelation point may complicate scalability.
1:Experimental Design and Method Selection:
The study uses tip sonication to exfoliate graphite in aqueous surfactant solutions, varying surfactant concentration (0.1–15 wt%), sonication power density (up to 420 W L?1), and time (up to 4 h). Dimensional analysis with Buckingham Pi theorem is employed to model the exfoliation process.
2:1–15 wt%), sonication power density (up to 420 W L?1), and time (up to 4 h). Dimensional analysis with Buckingham Pi theorem is employed to model the exfoliation process. Sample Selection and Data Sources:
2. Sample Selection and Data Sources: Natural graphite flakes (95% purity, 80 mesh) are purified and used. Surfactant solutions are prepared with Pluronic? F 127 in Milli-Q? water. Samples are drawn at intervals during sonication.
3:List of Experimental Equipment and Materials:
Equipment includes a Microson Ultrasonic Cell Disruptor with a 3 mm tip, Varian Cary 100 Scan spectrophotometer, HORIBA/Jobin Yvon Raman Spectrometer (Model: LabRAM), Malvern Instruments Zetasizer Nano ZS, Q500 TGA instrument, Autosorb-1 by Quantachrome, Hitachi H-7000 TEM, Veeco Di NanoScope IIIa AFM. Materials include Pluronic? F 127, N-Methyl-2-pyrrolidone (NMP), Milli-Q? water.
4:Experimental Procedures and Operational Workflow:
Graphite is added to surfactant solutions, sonicated at controlled temperature (20°C), with samples centrifuged and characterized using UV-VIS, Raman spectroscopy, DLS, TGA, BET, TEM, and AFM.
5:Data Analysis Methods:
Data is analyzed using Beer-Lambert law for concentration, polynomial subtraction and Savitsky-Golay filter for Raman spectra, cumulant analysis for DLS, and BET theory for surface area.
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Raman Spectrometer
LabRAM
HORIBA/Jobin Yvon
Used for Raman spectroscopy to analyze defect density and structure of GNPs.
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Zetasizer
Nano ZS
Malvern Instruments
Performs dynamic light scattering (DLS) to estimate particle size distribution of GNPs.
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TEM
H-7000
Hitachi
Obtains transmission electron microscopy images to analyze GNP morphology.
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AFM
Di NanoScope IIIa
Veeco
Performs atomic force microscopy to measure thickness of GNPs.
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Ultrasonic Cell Disruptor
Microson
Microson
Used for sonication to exfoliate graphite in aqueous surfactant solutions.
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Spectrophotometer
Varian Cary 100 Scan
Varian
Performs UV-VIS spectroscopy to measure absorbance and calculate GNP concentration.
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TGA Instrument
Q500
TA Instruments
Conducts thermogravimetric analysis to measure adsorbed surfactant on GNPs.
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BET Instrument
Autosorb-1
Quantachrome
Measures specific surface area of GNPs using Brunauer-Emmett-Teller method.
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Pluronic F 127
Sigma Aldrich
Surfactant used to assist in graphite exfoliation and stabilize GNPs in aqueous solution.
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N-Methyl-2-pyrrolidone
NMP
Sigma Aldrich
Solvent used for dispersing GNPs for TEM imaging.
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Milli-Q Water
Millipore
High-purity water used in all experiments for preparing solutions.
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