CF3CF2CF2C(CF3)2-based fluorinated surfactants with high surface activity

2019 ◽  
Vol 73 (6) ◽  
pp. 1499-1508
Author(s):  
Ding Zhang ◽  
Min Sha ◽  
Renming Pan ◽  
Xiangyang Lin ◽  
Ping Xing ◽  
...  
Keyword(s):  
Surface Activity ◽  
High Surface ◽  
Fluorinated Surfactants ◽  
High Surface Activity

Aggregation behaviours and bactericidal activities of novel cationic surfactants functionalized with amides and ether groups

RSC Advances ◽  
2015 ◽  
Vol 5 (34) ◽  
pp. 27197-27204 ◽  
Author(s):  
Guangzhou Cao ◽  
Xiangfeng Guo ◽  
Lihua Jia ◽  
Xuhua Tian
Keyword(s):  
Aqueous Solution ◽  
Surface Activity ◽  
Cationic Surfactants ◽  
High Surface ◽  
Bacterial Activity ◽  
Aggregation Behaviors ◽  
Bactericidal Activities ◽  
High Surface Activity

Novel cationic surfactants exhibit high surface activity, interesting aggregation behaviors in aqueous solution and excellent bacterial activity.

Virus-Templated Self-Mineralization of Ligand-Free Colloidal Palladium Nanostructures for High Surface Activity and Stability

2017 ◽  
Vol 27 (48) ◽  
pp. 1703262 ◽  
Author(s):  
Insu Kim ◽  
Kyungnam Kang ◽  
Mi Hwa Oh ◽  
Moon Young Yang ◽  
Inkyu Park ◽  
...  
Keyword(s):  
Surface Activity ◽  
High Surface ◽  
Ligand Free ◽  
High Surface Activity

Synthesis and properties of quaternary ammonium surfactants containing a methoxy benzyl substitute

RSC Advances ◽  
2014 ◽  
Vol 4 (100) ◽  
pp. 56918-56925 ◽  
Author(s):  
Zhenlong Zhao ◽  
Xiangfeng Guo ◽  
Lihua Jia ◽  
Yanyan Liu
Keyword(s):  
Surface Activity ◽  
Thermodynamic Functions ◽  
Quaternary Ammonium ◽  
High Surface ◽  
Quaternary Ammonium Surfactants ◽  
High Surface Activity

m-MDRA-n exhibit high surface activity, excellent adsorptive and bacterial properties, thermodynamic functions of micellization for m-MDRA-n were researched.

Study on Properties of Sulfonate Hyperbranched Polymer Surfactant

2012 ◽  
Vol 602-604 ◽  
pp. 794-797
Author(s):  
Xue Chuan Wang ◽  
Xin Miao Li ◽  
Tao Tao Qiang
Keyword(s):  
Surface Activity ◽  
Hyperbranched Polymer ◽  
Inorganic Salt ◽  
High Surface ◽  
Measuring Cylinder ◽  
Infrared Spectrometer ◽  
New Type ◽  
Polymer Surfactants ◽  
Polymer Surfactant ◽  
High Surface Activity

A new type of sulfonate surfactant (Gn-SHBP) has been prepared by esterification and sulphonation. At 25°C, the surface activity, the effect of NaCl on solution CMC（critical micelle concentration), emulsibility and the tolerance to inorganic salts of sulfonate hyperbranched polymer surfactants were investigated by the methods of surface tension, measuring cylinder and visible-infrared spectrometer. The results show that both surfactants have high surface activity; G2-SHBP exhibit higher surface activity than G1-SHBP with a CMC of 0.2 g/L and a γCMC of 25.36 mN/m; and both perform good emulsify power which exhibit better emulsion stability than SDBS; and high resistance to inorganic salt which can reach up to 260 g/L ( NaCl), 140 g/L(CaCl2) and 190 g/L(MgCl2), respectively.

scholarly journals An oxidation-resistant peptide mimic of surfactant protein B (B-YL) forms an amphipathic helix-hairpin in liposomes with high surface activity

2018 ◽  
Vol 2 ◽  
pp. 13
Author(s):  
Frans J. Walther ◽  
Monik Gupta ◽  
Larry M. Gordon ◽  
Alan J. Waring
Keyword(s):  
Ftir Spectroscopy ◽  
Preterm Infants ◽  
Surface Activity ◽  
High Surface ◽  
Md Simulations ◽  
Amphipathic Helix ◽  
Free Oxygen Radical ◽  
Oxidation Resistant ◽  
Α Helix ◽  
High Surface Activity

Background: Animal-derived surfactants containing surfactant proteins B (SP-B) and C (SP-C) are used to treat respiratory distress syndrome (RDS) in preterm infants. SP-B (79 residues) plays a pivotal role in lung function and the design of synthetic lung surfactant. Super Mini-B (SMB), a 41-residue peptide based on the N- and C-domains of SP-B joined with a turn and two disulfides, folds as an α-helix hairpin mimicking the properties of these domains in SP-B. Here, we studied ‘B-YL’, a 41-residue oxidation-resistant SMB variant that has its four Cys and two Met residues replaced by Tyr and Leu, respectively, to test whether these hydrophobic substitutions produce a surface-active, α-helix hairpin. Methods: Structure and function of B-YL and SMB in surfactant lipids were compared with CD and FTIR spectroscopy and molecular dynamic (MD) simulations, and surface activity with captive bubble surfactometry and in lavaged, surfactant-deficient adult rabbits. Results: CD and FTIR spectroscopy of B-YL in surfactant lipids showed secondary structures compatible with peptide folding as an α-helix hairpin, similar to SMB in lipids. MD simulations confirmed that B-YL maintained its α-helix hairpin in a lipid bilayer, matching the hairpin obtained from MD of SMB. Unlike the disulfide-reinforced helix-turn of SMB, the B-YL fold was stabilized by a core of clustered Tyr linking the N- and C-helices through noncovalent interactions involving aromatic rings. B-YL in surfactant lipids demonstrated excellent in vitro surface activity and good oxygenation and dynamic compliance in lavaged, surfactant-deficient adult rabbits. Conclusions: ‘Sulfur-free’ and ‘oxidation-resistant’ B-YL forms an amphipathic helix-hairpin in surfactant liposomes with high surface activity and is functionally similar to SMB and native SP-B. B-YL’s resistance against free oxygen radical damage provides an extra edge over oxidized SMB in the treatment of respiratory failure in preterm infants with RDS and children and adults with acute lung injury.

SOLUTIONS OF WATER STERICALLY SPECIFIC SURFACTANTS AS MODEL ECOLOGICAL CUTTING FLUIDS

Tribologia ◽  
2018 ◽  
Vol 271 (1) ◽  
pp. 87-95 ◽  
Author(s):  
Marian W. SUŁEK ◽  
Wiesław HRECZUCH ◽  
Jacek PRZEPIÓRKA ◽  
Anna ADACH
Keyword(s):  
Surface Activity ◽  
Alkyl Chain ◽  
Foam Stability ◽  
High Surface ◽  
Constant Load ◽  
Bearing Steel ◽  
Cutting Fluids ◽  
Foam Forming ◽  
Branched Chains ◽  
High Surface Activity

From the large group of surfactants with branched chains, sulfosuccinate derivatives obtained based on 2-ethylhexyl alcohol were selected. The surfactant of reference was ethoxylated sulfosuccinate with an alkyl chain (C12-C14). Tests regarding foam-forming ability (V0) and foam stability (V10) for selected solutions of the three surfactants were performed. Foam stability of the solutions of sterically specific surfactants (P13, P14) decreased by up to a factor of ten as compared with the equivalent linear alkyl chain (P19). This was achieved with the high surface activity of the solutions of these compounds as represented by surface tension and wettability of the surface of the bearing steel. The consequence of the high surface activity of the compounds were low friction and wear in tribological tests at constant load and excellent anti-seizure properties. On the cooperating friction pairs, adsorption layers were formed, effectively separating the two materials and able to transfer the high loads [L. 3]. Summing up, there is the possibility of using solutions of sterically specific surfactants as model cutting fluids with low foaming ability.

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