相关实验视频
Updated: Feb 7, 2026

10:09
Synthesis and Characterization of Amphiphilic Gold Nanoparticles
Published on: July 2, 2019
18.2K
碳和的空间隔离在一个单一的Janus半孔纳米粒子与可调的两性
Tiancong Zhao1, Xiaohang Zhu1, Chin-Te Hung1
1Department of Chemistry and Laboratory of Advanced Materials, State Key Laboratory of Molecular Engineering of Polymers, Collaborative Innovation Center of Chemistry for Energy Materials (2011-iChEM) , Fudan University , Shanghai 200433 , P.R. China.
Journal of the American Chemical Society
|July 12, 2018
概括
研究人员合成了新型的双半孔纳米颗粒来制造稳定的乳液. 这些磁性纳米粒子提供可调节的水友性/疏水性比率,提高了双相催化效率和可回收性.
科学领域:
- 材料科学
- 纳米技术
- 催化剂
背景情况:
- 类似表面活性剂的Janus纳米颗粒可以稳定乳液.
- 在Janus纳米颗粒中控制水性/疏水体积比对于乳液稳定至关重要,但仍然具有挑战性.
- 双半孔Fe3O4@mC&mSiO2雅努斯纳米粒子为应对这一挑战提供了一种新的方法.
研究的目的:
- 合成具有空间隔离的疏水性碳和疏水性域的双半孔Fe3O4@mC&mSiO2亚努斯纳米粒子.
- 为了证明可调节的水友性/疏水性比,以提高乳液稳定性.
- 评估它们在双相催化中的性能.
主要方法:
- 用于纳米粒子合成的新型表面电荷介导选择性封装方法.
- 双半孔Fe3O4@mC&mSiO2雅努斯纳米颗粒的表征 (可调节长度的纳米颗粒,磁性纳米圈).
- 在双相反应中评估乳液稳定性和催化性能.
主要成果:
- 成功合成具有明显的疏水性碳和疏水性的双半孔Fe3O4@mC&mSiO2亚努斯纳米粒子.
- 可精确调节的水/疏水比,使表面活性剂类乳液稳定性和磁场可回收性.
- 在双相催化中,优化的Janus纳米粒子实现了100%的转换效率和高转换频率.
结论:
- 开发的Janus纳米颗粒为稳定的乳液和高效的双相催化提供了强大的平台.
- 区域的空间分离和可调节的比率是它们卓越性能的关键.
- 这些磁纳米颗粒显示出先进的催化应用的巨大潜力.
相关概念视频
Carbon Skeletons
115.3K
Life on Earth is carbon-based, as all macromolecules that make up living organisms contain carbon atoms. All organic compounds have a carbon backbone. Each carbon atom is tetravalent and can bond with four other atoms, making it an extraordinarily flexible component of biological molecules. Because carbon’s valence electrons are stable, it rarely becomes an ion. As the carbon chain increases in length, structural modifications such as ring structures, double bonds, and branching side...
115.3K
The Carbon Cycle
43.9K
Carbon is the basis of all organic matter on Earth, and is recycled through the ecosystem in two primary processes: one in which carbon is exchanged among living organisms, and one in which carbon is cycled over long periods of time through fossilized organic remains, weathering of rocks, and volcanic activity. Human activities, including increased agricultural practices and the burning of fossil fuels, has greatly affected the balance of the natural carbon cycle.
43.9K
Carbonation Shrinkage
494
Atmospheric CO2 penetrates the concrete's pores and, in the presence of moisture, forms carbonic acid, which then reacts with calcium hydroxide in the hydrated cement, forming calcium carbonate. This process reduces the concrete's volume and is termed carbonation shrinkage.
The concrete's permeability is slightly reduced as calcium carbonate produced during the reaction fills its pores. Furthermore, its strength is slightly enhanced as the water released during the reaction...
The concrete's permeability is slightly reduced as calcium carbonate produced during the reaction fills its pores. Furthermore, its strength is slightly enhanced as the water released during the reaction...
494
Silica Gel Column Chromatography: Overview
3.6K
Silica gel column chromatography is a technique for separating compounds using a column packed with silica gel as the stationary phase. This method relies on differences in the polarity of compounds. Based on their polarities, compounds move between the stationary phase (silica gel) and the mobile phase (the solvent), forming discrete bands in the column.
Polar components tend to bind strongly to the silica gel, causing them to move slowly through the column. In contrast, nonpolar compounds...
Polar components tend to bind strongly to the silica gel, causing them to move slowly through the column. In contrast, nonpolar compounds...
3.6K
Carbon-dioxide Fixation
729
Carbon dioxide fixation in prokaryotes enables the assimilation of inorganic carbon into organic molecules, supporting biosynthetic pathways, sustaining ecosystems, and contributing to the global carbon cycle. It also has industrial applications in carbon capture and bioproduct synthesis. Autotrophic organisms rely on this process to utilize CO₂ as a carbon source in diverse environments.The Calvin CycleThe Calvin cycle is the most widespread carbon fixation mechanism, primarily used by...
729
Carbon-13 (¹³C) NMR: Overview
7.8K
Carbon-13 is a naturally occurring NMR-active isotope of carbon with a low natural abundance of 1.1%. In contrast, carbon-12 is the most abundant isotope of carbon with zero nuclear spin. Therefore, it is NMR inactive. The gyromagnetic ratio of carbon-13 is smaller than that of protons. As a result, carbon-13 resonance is about 6000 times weaker than proton resonance. For a given magnetic field strength, the resonance frequency of carbon-13 is about one-fourth of the resonance frequency for...
7.8K

