New focus of the cloud point/Krafft point of nonionic/cationic surfactants as thermochromic materials for smart windows

2022 ◽  
Author(s):  
Yihan Liu ◽  
Yanan Han ◽  
Zhaohui Huang ◽  
Ping Qi ◽  
Aixin Song ◽  
...  
Keyword(s):  
Cloud Point ◽  
Cationic Surfactants ◽  
Krafft Point ◽  
Smart Windows

A nonionic poly(oxyethylene) monoalkyl ether (C12(EO)6) and a cationic hexadecylpyridinium bromide (HPB) were used in featuring warm/cool transparency transition switchability, depending on the decrease in the hydration of the EO-headgroup...

Effect of protein denaturants on cloud point and krafft point of nonionic surfactants

1989 ◽  
Vol 132 (2) ◽  
pp. 444-450 ◽  
Author(s):  
Suk Kyu Han ◽  
Sang Myung Lee ◽  
Min Kim ◽  
Hans Schott
Keyword(s):  
Cloud Point ◽  
Nonionic Surfactants ◽  
Krafft Point

scholarly journals Cloud Point Extraction Of Cationic Surfactants And Their Ionic Associates With Sodium Dodecyl Sulfate

2020 ◽  
Vol 15 (3) ◽  
pp. 111-116
Author(s):  
S.O. Lelyushok ◽  
V.O. Doroschuk ◽  
S. A. Kulichenko
Keyword(s):  
Cloud Point ◽  
Cationic Surfactant ◽  
Anionic Surfactant ◽  
Cationic Surfactants ◽  
Cloud Point Extraction ◽  
Sodium Dodecyl ◽  
Ionic Surfactant ◽  
Rich Phase ◽  
Ionic Associates ◽  
Extraction Degree

The distribution of individual cationic surfactants and their ionic associates with the anionic surfactant in the cloud point extraction systems, based on non-ionic surfactant OP-7 was investigated. Determined that the dependence of the extraction degree of halides alkylpyridiniums on carboxylic change length in optimal conditions for extraction is characterized by the existence of maximum for cationic surfactant where n = 12. Decrease as well as increase in carboxylic change length of cation of alkylpyridiniums diminishes the effectiveness of their extraction into the surfactant-rich phase. The peculiarities of inter phase distribution of ionic associates cationic surfactant – anionic surfactant in the micellar extraction systems are investigated. It was shown, that with the increase in carboxylic change length of cationic surfactant the dependence of extraction degree of associates with anionic surfactant is characterized by the existence of the maximum. Most effective into the surfactant-rich phase extracted of ionic associates of three- and tetradecylpyridinium. Decreasing and increasing of hydrophobicity of alkylpyridiniums diminishes the effectiveness of extraction of associates. The established effects are explained by the hydrophobic correspondence between the substrate and the surfactant-rich phase of non-ionic surfactant.

A new application of Krafft point concept: an ultraviolet-shielded surfactant switchable window

2020 ◽  
Vol 56 (39) ◽  
pp. 5315-5318 ◽  
Author(s):  
Yihan Liu ◽  
Yiyi Guo ◽  
Zhuo Zhang ◽  
Zhaohui Huang ◽  
Ping Qi ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Krafft Point ◽  
Ionic Surfactants ◽  
Smart Windows ◽  
Uv Shielding ◽  
Responsive Gels ◽  
Mixed Water

We report thermo-responsive gels of polyacrylamide (PAAm) with ionic surfactants in mixed water and ethylene glycol (W–EG) solvents as smart windows to solubilize ultraviolet absorbents for UV shielding materials.

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