Synthesis, surface properties and cytotoxicity evaluation of nonionic urethane fluorinated surfactants with double short fluoroalkyl chains

Publication date: Available online 16 October 2019Source: Journal of Molecular LiquidsAuthor(s): Yichao Shen, Yong Jin, Shuangquan Lai, Liangjie Shi, Weining Du, Rong ZhouAbstractDeveloping suitable alternatives to long fluoroalkyl chain surfactants has drawn considerable attention on account of the concerns over the environmental safety and human health. However, low surface activity, poor water solubility and complex preparation process of most currently reported alternatives restrict their widespread applications. Herein, a series of nonionic urethane fluorinated surfactants (FmEGnFm) were synthesized by one-pot method using poly (ethylene glycol) (PEG), isophorone diisocyanate (IPDI) and short chain fluorinated alcohol as raw materials. The surfactant molecule is composed of two short fluoroalkyl chains connected to a PEG molecule via two IPDI spacers. Benefit from the special molecular structure design, these fluorinated surfactants displayed high surface activities, which could reduce the surface tensions of 17.8–28.7 mN/m and had low critical micelle concentrations of 0.17–0.98 mmol/L. These fluorinated surfactants showed good salt and pH resistance. Furthermore, contact angle and emulsifying experiments demonstrated that these fluorinated surfactants possessed excellent wetting and emulsifying properties at an extremely low concentration of 0.1 wt%. More importantly, the cytotoxicity experiment verified that these fluorinated surfactants had no obvio...
Source: Journal of Molecular Liquids - Category: Molecular Biology Source Type: research

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Publication date: Available online 11 November 2019Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Ning Feng, Ting Zhao, Yonghong Zhao, Peng Song, Guojin Li, Guangliang ZhangAbstractAliphatic alcohol polyoxyethylene ether phosphate (AEP) is an excellent surfactant, and thus the relationship between the ethylene oxide addition number of AEP and properties of AEP should be systematically described to improve the application efficiency of this surfactant. In this paper, the static surface tension, dynamic surface tension and wetting properties of AEP with different ethylene oxide (EO) additi...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Category: Chemistry Source Type: research
Abstract Universal nanocrystal formulation which can be applied to water-insoluble compounds was proposed and the criteria of its physicochemical properties as an active pharmaceutical ingredients (API) were investigated. Nanocrystal suspension was prepared by a wet-beads milling method. An acceptable Critical Quality Attributes (CQA) of nanocrystal suspension was defined by Z-average less than 500 nm and Polydispersity index (PDI) less than 0.3. Screening studies of dispersing and wetting agents were conducted using three model compounds in different pKa, melting points, etc., to find universal nanocrystal...
Source: Chemical and Pharmaceutical Bulletin - Category: Drugs & Pharmacology Authors: Tags: Chem Pharm Bull (Tokyo) Source Type: research
Publication date: Available online 10 September 2019Source: Results in PhysicsAuthor(s): Chan-Juan Zhou, Ya Li, Shao-Wen Yao, Ji-Huan HeAbstractBoth fibroin-based and sericin-based biomaterials have been studying extensively due to their wide applications, however the extraction of either fibroin or sericin protein is extremely complicated. Here we prepare the protein solution directly from alive silkworms instead of extracting proteins from silkworm silk. The protein solution and the polyvinyl alcohol solution are mixed in different weight ratios to produce silkworm-based silk fibers, which have many special properties li...
Source: Results in Physics - Category: Physics Source Type: research
(Natural News) Booze is one of the most essential things preppers need for any survival scenario, but not in the way you may think. Drinking alcohol is the last thing you should be doing in emergency situations. To get a clearer idea on how to use this substance in survival situations, here is an explanation...
Source: NaturalNews.com - Category: Consumer Health News Source Type: news
Publication date: Available online 19 July 2019Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Zhifang Wu, Yunling Li, Mengwei Wang, Jun Li, Zhifei WangAbstractThe linear fatty alcohol ether carboxylic ester (A12/14EC9E-H/A12/14EC9E-Na) surfactants were successfully prepared from the raw materials fatty alcohol ether (A12/14EO9) and succinic anhydride with a green and efficient one-step method. The chemical structure of A12/14EC9E-H was characterized by Fourier transform infrared (FT-IR), 1H-Nuclear magnetic resonance (1HNMR) and Matrix-assisted laser desorption/ionization time of flight ...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Category: Chemistry Source Type: research
Distillation of Alcohol/Water Solution in Hybrid Metal ‐organic Framework Hollow Fibers AbstractDistillation with multitudinous structured packings has shown great potential for chemical separation. However, there still remains a big challenge to prepare porous structured packings with more productive separation and better mass transfer efficiency due to materials limitations. Metal –organic framework (MOF) membranes have commendable porous structures that provide enough pathways for fast mass transport and superhydrophobic character for efficient separation. Herein, novel MOFs‐based hollow fiber structured packi...
Source: AIChE Journal - Category: Science Authors: Tags: SEPARATIONS: MATERIALS, DEVICES AND PROCESSES Source Type: research
Conclusion: The presence of NE in a third of the patients who developed over time OAB and the earlier onset of OAB for these patients suggests a causal physiopathological relationship between NE and OAB. The preponderance of urban patients confirms the existence of acquired urban triggering factors of OAB (nutritious, social, or professional). PMID: 31203588 [PubMed - as supplied by publisher]
Source: Turkish Journal of Medical Sciences - Category: General Medicine Tags: Turk J Med Sci Source Type: research
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Source: AIChE Journal - Category: Science Authors: Tags: SEPARATIONS: MATERIALS, DEVICES AND PROCESSES Source Type: research
Publication date: Available online 30 March 2019Source: Catalysis TodayAuthor(s): Gajeon Chon, Minhee Suk, Frédéric Jaouen, Min Wook Chung, Chang Hyuck ChoiAbstractThe membrane electrode assembly (MEA) is a core component of low-temperature fuel cells. The first step of MEA manufacturing is the preparation of a catalyst ink suspension in which the catalyst powder is homogeneously dispersed in a liquid solvent through mechanical or sonic agitation. In this work, we have studied the effects of catalyst dispersion in water or alcohol solutions and subsequent drying processes on the physicochemical properties of ...
Source: Catalysis Today - Category: Chemistry Source Type: research
CONCLUSIONS The results suggest that the contact lenses tested in this study have similar efficiency in delivering polyvinyl alcohol.
Source: Optometry and Vision Science - Category: Opthalmology Tags: ORIGINAL INVESTIGATIONS Source Type: research
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