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相关概念视频

Physical Properties of Alcohols and Phenols02:32

Physical Properties of Alcohols and Phenols

14.4K
Alcohols are organic compounds in which a hydroxy group is attached to a saturated carbon. Phenols are a class of alcohols containing a hydroxy group attached to an aromatic ring. The physical properties of the alcohols and phenols are influenced by hydrogen bonding due to the oxygen–hydrogen dipole in the hydroxy functional group and dispersion forces between alkyl or aryl regions of alcohol and phenol molecules.
Alcohols possess a higher boiling point than aliphatic hydrocarbons of...
14.4K
Preparation of Alcohols via Addition Reactions02:15

Preparation of Alcohols via Addition Reactions

6.3K
Overview
The acid-catalyzed addition of water to the double bond of alkenes is a large-scale industrial method used to synthesize low-molecular-weight alcohols. An acidic atmosphere is required to allow the hydrogen in the water molecule to act as an electrophile and attack the double bond in an alkene. The addition of a proton to the double bond creates a carbocation intermediate. The proton preferentially bonds to the less substituted end of the double bond to create a more stable carbocation...
6.3K
¹H NMR of Labile Protons: Temporal Resolution01:10

¹H NMR of Labile Protons: Temporal Resolution

1.1K
Protons bonded to heteroatoms such as nitrogen and oxygen exhibit a range of chemical shift values. This is due to the varying degree of hydrogen bonding between the proton and the heteroatom in other molecules. The extent of hydrogen bonding affects the electron density around the proton, thereby giving different chemical shift values for the protons in the proton NMR spectrum.
The –OH proton in alcohols typically appears in the range of δ 2 to 5 ppm but can vary depending on the specific...
1.1K
Physical Properties of Ethers02:17

Physical Properties of Ethers

7.1K
Overview
An ether molecule has a net dipole moment due to the polarity of C–O bonds. Subsequently, boiling points of ethers are lower than those of alcohols of comparable molecular weight and slightly higher than those of hydrocarbons of comparable molecular weight (Table 1).
Ethers can act as hydrogen bond acceptors, making them more water-soluble than hydrocarbons, but since ethers cannot act as hydrogen bond donors, they are much less soluble in water than alcohols. Ethers are considered...
7.1K
Vapor Pressure02:34

Vapor Pressure

35.0K
When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules move randomly about, they will occasionally collide with the surface of the condensed phase, and in some cases, these collisions will result in the molecules re-entering the condensed phase. The change from the gas phase to the liquid is called condensation. When the rate of condensation becomes equal to the rate of vaporization, neither the amount of the liquid nor the amount of the vapor...
35.0K
Protection of Alcohols02:31

Protection of Alcohols

7.3K
This lesson delves into the concept of protection and deprotection of a functional group fundamental to synthetic organic chemistry. These phenomena are explained in the context of aliphatic and aromatic alcohols.
Protection
It defines a protecting group as the masking agent to make the more reactive species inert to a given set of conditions. This concept is depicted via the illustration of liquid flow through different outlets in an assembly of pipes. The analogy helps to understand the role...
7.3K

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相关实验视频

Updated: Jul 6, 2025

Production of Membrane-Filtered Phase-Shift Decafluorobutane Nanodroplets from Preformed Microbubbles
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Production of Membrane-Filtered Phase-Shift Decafluorobutane Nanodroplets from Preformed Microbubbles

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在纯酒精中存在纳米泡吗?

Harsh Sharma1, Mohit Trivedi1, Neelkanth Nirmalkar1

  • 1Department of Chemical Engineering, Indian Institute of Technology Ropar, Rupnagar 140001, India.

Langmuir : the ACS journal of surfaces and colloids
|January 4, 2024
PubMed
概括

稳定的纳米泡在纯酒精中存在,挑战了以前的离子稳定理论. 这项研究使用先进的技术生成和描述了这些酒精纳米泡,证实了它们的存在.

科学领域:

  • 物理化学 物理化学
  • 纳米技术纳米技术
  • 体科学 体科学 体科学

背景情况:

  • 在纯水中存在纳米泡的存在受到辩论,并提出了离子稳定.
  • 由于缺乏离子,酒精系统中的纳米泡仍然存在争议.

研究的目的:

  • 为了测试稳定的纳米泡在纯酒精中存在的假设.
  • 描述在纯酒精中产生的纳米泡的特性.

主要方法:

  • 使用超声波和振荡压力场生成纳米泡.
  • 通过纳米粒子跟踪分析 (NTA) 进行尺寸和度的表征.
  • 使用光散射测量泽塔潜力.
  • 使用Mie散射理论和电磁波模拟来估计折射率 (RI).

主要成果:

  • 纳米泡成功地产生并检测到在纯酒精中.
  • 这些纳米泡的平均折射率估计为1.17 ± 0.03.
  • 脱气减少了纳米泡的度,并增加了它们的尺寸.
  • 平均泽塔电位在-5±0.9mV时被测量.
  • 机械稳定性模型预测了纳米泡的存在.

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Induction of Microstreaming by Nonspherical Bubble Oscillations in an Acoustic Levitation System
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Formulation and Acoustic Modulation of Optically Vaporized Perfluorocarbon Nanodroplets
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Formulation and Acoustic Modulation of Optically Vaporized Perfluorocarbon Nanodroplets

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Production of Membrane-Filtered Phase-Shift Decafluorobutane Nanodroplets from Preformed Microbubbles
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Induction of Microstreaming by Nonspherical Bubble Oscillations in an Acoustic Levitation System
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Induction of Microstreaming by Nonspherical Bubble Oscillations in an Acoustic Levitation System

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Formulation and Acoustic Modulation of Optically Vaporized Perfluorocarbon Nanodroplets
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Formulation and Acoustic Modulation of Optically Vaporized Perfluorocarbon Nanodroplets

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结论:

  • 实验和理论证据支持纯酒精中纳米泡的存在.
  • 这些纳米泡在更高阶的酒精中表现出边缘的体稳定性.
  • 这些发现挑战了离子对于纳米泡稳定性的必要性.