Lauryl betaine(LB)as an amphoteric surfactant carries both positive and negative charges and should be able to generate stable foam through electrostatic interaction with nanoparticles and co-surfactants.However,no pr...Lauryl betaine(LB)as an amphoteric surfactant carries both positive and negative charges and should be able to generate stable foam through electrostatic interaction with nanoparticles and co-surfactants.However,no previous attempts have been made to investigate the influence of nanoparticles and other co-surfactants on the stability and apparent viscosity of LBstabilized foam.In this study,a thorough investigation on the influence of silicon dioxide(SiO2)nanoparticles,alpha olefin sulfonate(AOS)and sodium dodecyl sulfate(SDS),on foam stability and apparent viscosity was carried out.The experiments were conducted with the 2D Hele-Shaw cell at high foam qualities(80%-98%).Influence of AOS on the interaction between the LB foam and oil was also investigated.Results showed that the SiO2-LB foam apparent viscosity decreased with increasing surfactant concentration from 0.1 wt%to 0.3 wt%.0.1 wt%SiO2 was the optimum concentration and increased the 0.1 wt%LB foam stability by 108.65%at 96%foam quality.In the presence of co-surfactants,the most stable foam,with the highest apparent viscosity,was generated by AOS/LB solution at a ratio of 9:1.The emulsified crude oil did not imbibe into AOS-LB foam lamellae.Instead,oil was redirected into the plateau borders where the accumulated oil drops delayed the rate of film thinning,bubble coalescence and coarsening.展开更多
This paper aims at synthesizing a detergent with graphene oxide(GO)and lauryl betaine(LB),where the GO will have a better performance with the modification of LB.First,the complexus of GO and LB and the complexus of G...This paper aims at synthesizing a detergent with graphene oxide(GO)and lauryl betaine(LB),where the GO will have a better performance with the modification of LB.First,the complexus of GO and LB and the complexus of GO,KH550(Amino functional silane),and LB were synthesized to obtain two products,GO⁃LB and GO⁃KH550⁃LB.Then,the abilities and safety of the products were evaluated by characterization,contact angle measurement,measurement of KRAFFT Point,foaming test,emulsion ability test,decontamination capacity test,skin irritation test,and skin allergy test.Results of the experiment showed that GO⁃LB was superior to GO⁃KH550⁃LB in wetting ability and foaming stability,while GO⁃KH550⁃LB outperformed in emulsifying capacity.Besides,good abilities of removing mussels,seaweed,and protein were proved.According to the result of the irritation test of the materials to skin,they were both at the light irritation level,and the irritation of the GO⁃LB was slightly lower than that of GO⁃KH550⁃LB.Neither GO⁃LB nor GO⁃KH550⁃LB had allergic effect.Therefore,it can be concluded that as a surface active agent,graphene oxide/lauryl betaine was effective as a new detergent,which had low irritation and insignificant allergic phenomena on the human body over a long term of use.展开更多
Spin-lattice relaxation time, spin-spin relaxation time and two-dimensional nuclear Overhauser enhancement spectroscopy (2D NOESY) experiments of polyoxyethylene lauryl ether (Brij-35) micelles in aqueous solutions at...Spin-lattice relaxation time, spin-spin relaxation time and two-dimensional nuclear Overhauser enhancement spectroscopy (2D NOESY) experiments of polyoxyethylene lauryl ether (Brij-35) micelles in aqueous solutions at a concentration of 100 times the critical micellar concentration (cmc) give direct evidence that the hydrophilic polyoxyethylene chains, staying in the exterior of the micellar core, are coiled, bent and aligned around the micellar core with a certain number of water molecules included. This hydrophilic layer is in contact with the solvent, water, keeping the micellar solution stable. 1H NMR relaxation time measurements show that the first oxyethylene group next to the alkyl chain participates in the formation of the surface area of the micellar core. The motion of the hydrophilic polyoxyethylene chains is less restricted as compared with the hydrophobic alkyl chains.展开更多
文摘Lauryl betaine(LB)as an amphoteric surfactant carries both positive and negative charges and should be able to generate stable foam through electrostatic interaction with nanoparticles and co-surfactants.However,no previous attempts have been made to investigate the influence of nanoparticles and other co-surfactants on the stability and apparent viscosity of LBstabilized foam.In this study,a thorough investigation on the influence of silicon dioxide(SiO2)nanoparticles,alpha olefin sulfonate(AOS)and sodium dodecyl sulfate(SDS),on foam stability and apparent viscosity was carried out.The experiments were conducted with the 2D Hele-Shaw cell at high foam qualities(80%-98%).Influence of AOS on the interaction between the LB foam and oil was also investigated.Results showed that the SiO2-LB foam apparent viscosity decreased with increasing surfactant concentration from 0.1 wt%to 0.3 wt%.0.1 wt%SiO2 was the optimum concentration and increased the 0.1 wt%LB foam stability by 108.65%at 96%foam quality.In the presence of co-surfactants,the most stable foam,with the highest apparent viscosity,was generated by AOS/LB solution at a ratio of 9:1.The emulsified crude oil did not imbibe into AOS-LB foam lamellae.Instead,oil was redirected into the plateau borders where the accumulated oil drops delayed the rate of film thinning,bubble coalescence and coarsening.
基金Sponsored by the Outstanding Academic Leaders Foundation of Harbin(Grant No.2013RFXXJ042)the Planning Project for Space Application(Grant No.01-1-08).
文摘This paper aims at synthesizing a detergent with graphene oxide(GO)and lauryl betaine(LB),where the GO will have a better performance with the modification of LB.First,the complexus of GO and LB and the complexus of GO,KH550(Amino functional silane),and LB were synthesized to obtain two products,GO⁃LB and GO⁃KH550⁃LB.Then,the abilities and safety of the products were evaluated by characterization,contact angle measurement,measurement of KRAFFT Point,foaming test,emulsion ability test,decontamination capacity test,skin irritation test,and skin allergy test.Results of the experiment showed that GO⁃LB was superior to GO⁃KH550⁃LB in wetting ability and foaming stability,while GO⁃KH550⁃LB outperformed in emulsifying capacity.Besides,good abilities of removing mussels,seaweed,and protein were proved.According to the result of the irritation test of the materials to skin,they were both at the light irritation level,and the irritation of the GO⁃LB was slightly lower than that of GO⁃KH550⁃LB.Neither GO⁃LB nor GO⁃KH550⁃LB had allergic effect.Therefore,it can be concluded that as a surface active agent,graphene oxide/lauryl betaine was effective as a new detergent,which had low irritation and insignificant allergic phenomena on the human body over a long term of use.
基金This work was supported by the National Key Basic Research Development Program "Fundamental Studies of the Extensively Enhanced Petroleum Recovery" (Grant No. G199022504) .
文摘Spin-lattice relaxation time, spin-spin relaxation time and two-dimensional nuclear Overhauser enhancement spectroscopy (2D NOESY) experiments of polyoxyethylene lauryl ether (Brij-35) micelles in aqueous solutions at a concentration of 100 times the critical micellar concentration (cmc) give direct evidence that the hydrophilic polyoxyethylene chains, staying in the exterior of the micellar core, are coiled, bent and aligned around the micellar core with a certain number of water molecules included. This hydrophilic layer is in contact with the solvent, water, keeping the micellar solution stable. 1H NMR relaxation time measurements show that the first oxyethylene group next to the alkyl chain participates in the formation of the surface area of the micellar core. The motion of the hydrophilic polyoxyethylene chains is less restricted as compared with the hydrophobic alkyl chains.
