Preparation of Low-dielectric Permittivity Polyimide Resins with High Surface Activity from Chemically Bonded Hyperbranched Polysiloxane

2021 ◽  
Author(s):  
Xiu-Ting Li ◽  
Xiao-Meng Zhu ◽  
Jie Dong ◽  
Xin Zhao ◽  
Qing-Hua Zhang
Keyword(s):  
Dielectric Permittivity ◽  
Surface Activity ◽  
High Surface ◽  
Low Dielectric ◽  
Hyperbranched Polysiloxane ◽  
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.

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