相关实验视频
Updated: Jul 14, 2025

09:45
Fluorescence Lifetime Imaging of Molecular Rotors in Living Cells
Published on: February 9, 2012
25.3K
提奥夫拉-T:一种基于量子产量的分子粘度计,用于糖醇-单氧醇混合物
Puspal Mukherjee1, Sintu Ganai1
1Department of Chemistry, School of Sciences, Netaji Subhas Open University, Kolkata, West Bengal. 700064, India.
ACS omega
|October 9, 2023
概括
提奥夫拉T (ThT) 光揭示了局部粘度. 这项研究模拟了糖醇-酒精混合物中的ThT量子产量,以预测溶剂特性和粘度.
科学领域:
- 摄影化学的使用.
- 物理化学 物理化学
- 材料科学 材料科学 材料科学
背景情况:
- 提奥夫拉T (ThT) 是一种分子转子染料,在低粘度溶剂中是非光的,但在与粉样纤维结合时是高度光的.
- 这种光变化是由于其部分在激发状态下的粘度控制的旋转,使ThT量子产量能够评估环境粘度.
研究的目的:
- 为了研究ThT (φThT) 在六种酒精溶剂混合物与甘油的各种组成中的量子产量.
- 提出一种使用 φThT 的实证模型来估计相互作用参数,并预测溶剂混合物的非理想性.
- 建立 ThT 量子产量与散装粘度之间的关系,并提出一种用于在无特征混合物中的粘度预测的方法.
主要方法:
- 在糖醇-酒精溶剂混合物 (甲醇,乙醇,n-醇,异醇,n-butanol, tert-butanol) 中测量ThT量子产量 (φThT).
- 开发一种经验模型,将φThT与糖分子分数相关联,以估计相互作用参数和混合物非理想性.
- 在选定的溶剂混合物中,确定ThT量子产量和散装粘度之间的功率定律关系.
主要成果:
- 提出了一个经验模型来估计相互作用参数,并根据 φThT 预测糖醇-酒精溶剂混合物的非理想性.
- 在甲醇,乙醇,n-butanol 和 tert-butanol 混合物中,ThT 量子产量和散装粘度之间建立了Förster-Hoffmann 和 Loutfy-Arnold 类型的功率定律关系.
- 开发了一种方法来量化和预测n-propanol-glycerol和isopropanol-glycerol混合物的散装粘度系数.
结论:
- 提奥夫拉T的量子产量可以有效地用于建模和预测糖醇-酒精溶剂混合物的性质和散装粘度.
- 已建立的功率定律关系提供了可靠的方法来确定各种溶剂组合中的粘度.
- 这项研究提供了一种新的方法来量化以前未经表征的溶剂混合物的粘度.
相关概念视频
Titration in Nonaqueous Solvents
833
Most acid-base titrations are performed in an aqueous medium. In aqueous titrations, water competes with weaker acids or bases for proton donation or acceptance, leading to ambiguous endpoints in the titration curve. Water also affects the partial ionization of weak acids or bases. For example, water accepts a proton from acetic acid to form hydronium and acetate ions. The hydronium ion formed is a stronger acid than acetic acid, and the acetate ion is a stronger base than water. As a result,...
833
Physical Properties of Alcohols and Phenols
14.5K
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...
Alcohols possess a higher boiling point than aliphatic hydrocarbons of...
14.5K
Membrane Fluidity
152.7K
Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules are generally able to move about in the plane of the membrane, giving the membrane its flexible nature called fluidity. Two other features of the membrane contribute to membrane fluidity: the chemical structure of the phospholipids and the presence of cholesterol in the membrane.
152.7K
Spectrophotometry: Introduction
3.2K
Spectrophotometry is the quantitative measurement of the absorption, reflection, diffraction, or transmission of electromagnetic radiation through a material as a function of the intensity and wavelength of the radiation. A spectrophotometer is a device used to measure the change in the radiation intensity caused by its interaction with the material.
The essential components of a spectrophotometer include a source of electromagnetic radiation, a slot for placing a material to be analyzed, and a...
The essential components of a spectrophotometer include a source of electromagnetic radiation, a slot for placing a material to be analyzed, and a...
3.2K
IR and UV–Vis Spectroscopy of Aldehydes and Ketones
5.8K
Infrared spectroscopy, also known as vibrational spectroscopy, is mainly used to determine the types of bonds and functional groups in molecules. In aldehydes and ketones, the carbonyl (C=O) bond shows an absorption around 1710 cm-1. The C=O bond vibration of an aldehyde occurs at lower frequencies than that of a ketone. In addition to the C=O absorption in an aldehyde, the aldehydic C–H bond also gives two peaks in the 2700–2800 cm-1 range. This absorption, coupled with the...
5.8K
Titrimetric Methods: Types and Commonly Used Strategies
947
In chemistry, titrimetric methods are broadly classified into three types: volumetric, gravimetric, and coulometric. Volumetric titrations involve measuring the volume of a titrant of known concentration that is required to react completely with an analyte. In gravimetric titrations, the standard solution reacts with the analyte to form an insoluble precipitate, which is filtered, dried, and weighed. In coulometric titrations, current is applied to an electrochemical reaction until the reaction...
947

