在八甲基POSS微结构上可控制的含氧功能组的"绿色"动等离子体功能化策略
Xiao Chen1,2,3,4, Kevin Magniez3,5, Pengchao Zhang1,2
1State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, School of Materials Science and Engineering, Wuhan University of Technology, 122 Luoshi Road, Wuhan 430070, China.
Nanomaterials (Basel, Switzerland)
|October 27, 2023
概括
一种新的绿色等离子体策略功能化了多面寡合性丝素 (POSS) 亚微米粒子. 这种方法精确地控制含氧组,用于先进的复合膜填充剂.
科学领域:
- 材料科学 材料科学 材料科学
- 表面化学 表面化学
- 绿色化学 绿色化学
背景情况:
- 多面体寡聚性丝素 (POSS) 材料是复合膜中有效的填充物,用于分离.
- 表面功能化对于POSS应用至关重要,但由于危险的副产品,传统的湿化学方法具有挑战性.
研究的目的:
- 提出一个"绿色"的等离子体策略,用于功能化八甲基POSS亚微米粒子.
- 在POSS表面上实现可设计的含氧功能组.
- 为湿化学方法提供一个环保的替代方案.
主要方法:
- 使用低压氧等离子体,结合连续波 (CW) 和脉冲 (CW+P) 模式.
- 采用CW模式用于表面蚀刻和POSS的激活.
- 使用脉冲血将氧物种移植到甲基上,形成基和基.
主要成果:
- 成功地功能化了含氧组的八甲基POSS亚微粒.
- 实现了精确的控制,每一个POSS角约产生一个基或基组.
- 在不损害POSS核心结构的情况下展示了功能.
结论:
- 呈现的等离子体工艺是一种可控制的方法,用于微微粒子的表面功能化.
- 这种方法为准备功能化的POSS填充器提供了更环保的途径.
- 这些发现支持使用等离子技术来设计用于分离应用的先进材料.
相关概念视频
02:36Oxymercuration-Reduction of Alkenes
Oxymercuration–reduction of alkenes is one of the major reactions converting alkenes to alcohols. It involves the hydration of alkenes with mercuric acetate in a mixture of tetrahydrofuran and water, forming an organomercury adduct. This is followed by a demercuration step in which the adduct is reduced to an alcohol using sodium borohydride.
03:08Hydroboration-Oxidation of Alkenes
In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
02:44Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
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.
01:46Oxidative Cleavage of Alkenes: Ozonolysis
In ozonolysis, ozone is used to cleave a carbon–carbon double bond to form aldehydes and ketones, or carboxylic acids, depending on the work-up.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
01:19Oxidation and Reduction of Organic Molecules
Energy production within a cell involves many coordinated chemical pathways. Most of these pathways are combinations of oxidation and reduction reactions, which occur at the same time. An oxidation reaction strips an electron from an atom in a compound, and the addition of this electron to another compound is a reduction reaction. Because oxidation and reduction usually occur together, these pairs of reactions are called redox reactions.
The removal of an electron from a molecule, results in a...
The removal of an electron from a molecule, results in a...