拉曼评价在石墨烯油中分散的氧化石墨烯
Alan Passero1, Taynara A DE Carvalho1, Natalia B Sanches2
1Instituto Tecnológico de Aeronáutica, Departamento de Química, Divisão de Ciências Fundamentais, Departamento de Ciência e Tecnologia Aerospacial, Praça Mal. Eduardo Gomes, 50, Vila das Acácias, 12228-900 São José dos Campos, SP, Brazil.
Anais da Academia Brasileira de Ciencias
|April 2, 2025
概括
这项研究引入了新的方法来测量石墨烯氧化物含量和塑化剂中的分散. 这些技术对于开发用于工业和航空航天应用的先进聚合物复合材料至关重要.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术纳米技术
- 聚合物化学 聚合物化学
背景情况:
- 石墨烯氧化物 (GO) 融入聚合物复合材料显著增强机械,热,化学和电性能,即使在低度 (0.1-5.0%).
- 在聚合物矩阵内有效分散GO对于实现这些性能增强至关重要.
- 对于准确评估工业系统中GO分散的方法有限.
研究的目的:
- 提出新的方法来量化氧化石墨烯含量,并评估其在石墨烯塑化剂中的分散.
- 建立可靠的分析技术,用于GO增强的聚合物系统的质量控制.
- 为了进一步了解工业和航空航天应用的GO分散.
主要方法:
- 结合部分最小平方回归和拉曼光谱的多变量方法被用来确定GO粒子的大小和含量.
- 开发一种激光衍射方法来评估氧化石墨烯的分散性.
- 对线性 (R2 > 0.99) 和低分析误差 (> 0.29%) 的方法的验证.
主要成果:
- 在石墨烯氧化物/塑化剂系统中,精确确定了石墨烯氧化物含量和颗粒大小.
- 成功开发了一种强大的激光衍射方法来评估氧化石墨烯的分散性.
- 开发的方法提供了高线性和分析精度.
结论:
- 提出的方法提供了可靠的工具,用于在聚合物系统中表征石墨烯氧化物.
- 这些发现支持工业解决方案的发展,特别是在航空航天领域,利用GO增强的聚合物.
- 准确的分散评估是释放石墨烯氧化物在复合材料中的全部潜力的关键.
相关概念视频
03:06Alkali Metals
Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
Table 1: Properties of the alkali metals
02:14Combustion Energy: A Measure of Stability in Alkanes and Cycloalkanes
The low reactivity in alkanes can be attributed to the non-polar nature of C–C and C–H σ bonds. Alkanes, therefore, were initially termed as “paraffins,” derived from the Latin words: parum, meaning “too little,” and affinis, meaning “affinity.”
Alkanes undergo combustion in the presence of excess oxygen and high-temperature conditions to give carbon dioxide and water. A combustion reaction is the energy source in natural gas, liquified petroleum gas (LPG), fuel oil, gasoline, diesel fuel, and...
Alkanes undergo combustion in the presence of excess oxygen and high-temperature conditions to give carbon dioxide and water. A combustion reaction is the energy source in natural gas, liquified petroleum gas (LPG), fuel oil, gasoline, diesel fuel, and...
02:21Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate
Alkenes can be dihydroxylated using potassium permanganate. The method encompasses the reaction of an alkene with a cold, dilute solution of potassium permanganate under basic conditions to form a cis-diol along with a brown precipitate of manganese dioxide.
01:20Mass Spectrometry: Molecular Fragmentation Overview
The ionization of a molecule into a molecular ion inside the mass spectrometer causes instability in the molecule's structure due to the loss of an electron. This eventually leads to the fragmentation or breaking of some bonds in the molecule. The fragmentation occurs predominantly at specific bonds to yield relatively stable fragments.
One type of fragmentation pattern is the cleavage of a single bond in the molecular ion. The cleavage leads to a radical and a cation. The cleavage can occur at...
One type of fragmentation pattern is the cleavage of a single bond in the molecular ion. The cleavage leads to a radical and a cation. The cleavage can occur at...