The Experts below are selected from a list of 524178 Experts worldwide ranked by ideXlab platform
Adam L Washington - One of the best experts on this subject based on the ideXlab platform.
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multivalent electrolyte Induced Surface ordering and solution self assembly in anionic surfactant mixtures sodium dodecyl sulfate and sodium diethylene glycol monododecyl sulfate
Journal of Colloid and Interface Science, 2020Co-Authors: Peixun Li, Mario Campana, Jeff Penfold, Zi Wang, Robert J Thomas, John R. P. Webster, Yao Chen, Adam L WashingtonAbstract:Abstract The formation of Surface multilayer structures, with the addition of multivalent electrolytes, has been observed in a range of different anionic surfactants; and notably the sodium oxyethylene glycol alkyl sulfate, SAES, and alkyl ester sulfonate, AES, surfactants. The addition of increasing amounts of AlCl3 results in increasing Surface layering, with a transition from monolayer to bilayer to ultimately more extended multilayer structures at the interface. The headgroup structures of these SAES and AES surfactants and their hydrophilic / hydrophobic balance give a degree of tolerance to the precipitation Induced by multivalent counterions. This was considered to be important factor associated with the multivalent counterion Induced Surface layering. In this paper the impact of sodium dodecyl sulfate, SDS, an anionic surfactant more susceptible to precipitation in the presence of multivalent counterions, on the Surface multilayer formation and solution self-assembly of sodium diethylene glycol monododecyl sulfate, SLES, is explored using Surface tension, neutron reflectivity and small angle neutron scattering. The results show that SDS exhibits a similar progressive evolution in Surface structures with increasing AlCl3 concentrations, as observed in SLES and related SAES surfactants, and in MES, sodium methyl ester dodecyl sulfonate surfactant. However in the SLES / SDS mixtures the structural evolution is different, and more complex pattern with increasing AlCl3 concentration is observed. The initial transition from monolayer to bilayer / trilayer structures exists, but the Surface at higher AlCl3 concentration reverts to monolayer adsorption before extended multilayer structures are formed. Complementary small angle neutron scattering measurements indicate a more complex evolution in the micelle structure which broadly correlates with the Surface behaviour. The results illustrate how subtle changes in headgroup structure and packing affect relative counterion binding and hence the Surface and solution structures. The results reinforce and extend the observations of related structures on different SAES and AES surfactants, and highlight the opportunity for manipulating Surface adsorption behaviour with surfactant mixtures.
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multivalent electrolyte Induced Surface ordering and solution self assembly in anionic surfactant mixtures sodium dodecyl sulfate and sodium diethylene glycol monododecyl sulfate
Journal of Colloid and Interface Science, 2020Co-Authors: Peixun Li, Mario Campana, Jeff Penfold, Zi Wang, Robert J Thomas, John R. P. Webster, Yao Chen, Adam L WashingtonAbstract:Abstract The formation of Surface multilayer structures, with the addition of multivalent electrolytes, has been observed in a range of different anionic surfactants; and notably the sodium oxyethylene glycol alkyl sulfate, SAES, and alkyl ester sulfonate, AES, surfactants. The addition of increasing amounts of AlCl3 results in increasing Surface layering, with a transition from monolayer to bilayer to ultimately more extended multilayer structures at the interface. The headgroup structures of these SAES and AES surfactants and their hydrophilic / hydrophobic balance give a degree of tolerance to the precipitation Induced by multivalent counterions. This was considered to be important factor associated with the multivalent counterion Induced Surface layering. In this paper the impact of sodium dodecyl sulfate, SDS, an anionic surfactant more susceptible to precipitation in the presence of multivalent counterions, on the Surface multilayer formation and solution self-assembly of sodium diethylene glycol monododecyl sulfate, SLES, is explored using Surface tension, neutron reflectivity and small angle neutron scattering. The results show that SDS exhibits a similar progressive evolution in Surface structures with increasing AlCl3 concentrations, as observed in SLES and related SAES surfactants, and in MES, sodium methyl ester dodecyl sulfonate surfactant. However in the SLES / SDS mixtures the structural evolution is different, and more complex pattern with increasing AlCl3 concentration is observed. The initial transition from monolayer to bilayer / trilayer structures exists, but the Surface at higher AlCl3 concentration reverts to monolayer adsorption before extended multilayer structures are formed. Complementary small angle neutron scattering measurements indicate a more complex evolution in the micelle structure which broadly correlates with the Surface behaviour. The results illustrate how subtle changes in headgroup structure and packing affect relative counterion binding and hence the Surface and solution structures. The results reinforce and extend the observations of related structures on different SAES and AES surfactants, and highlight the opportunity for manipulating Surface adsorption behaviour with surfactant mixtures.
Jeff Penfold - One of the best experts on this subject based on the ideXlab platform.
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multivalent electrolyte Induced Surface ordering and solution self assembly in anionic surfactant mixtures sodium dodecyl sulfate and sodium diethylene glycol monododecyl sulfate
Journal of Colloid and Interface Science, 2020Co-Authors: Peixun Li, Mario Campana, Jeff Penfold, Zi Wang, Robert J Thomas, John R. P. Webster, Yao Chen, Adam L WashingtonAbstract:Abstract The formation of Surface multilayer structures, with the addition of multivalent electrolytes, has been observed in a range of different anionic surfactants; and notably the sodium oxyethylene glycol alkyl sulfate, SAES, and alkyl ester sulfonate, AES, surfactants. The addition of increasing amounts of AlCl3 results in increasing Surface layering, with a transition from monolayer to bilayer to ultimately more extended multilayer structures at the interface. The headgroup structures of these SAES and AES surfactants and their hydrophilic / hydrophobic balance give a degree of tolerance to the precipitation Induced by multivalent counterions. This was considered to be important factor associated with the multivalent counterion Induced Surface layering. In this paper the impact of sodium dodecyl sulfate, SDS, an anionic surfactant more susceptible to precipitation in the presence of multivalent counterions, on the Surface multilayer formation and solution self-assembly of sodium diethylene glycol monododecyl sulfate, SLES, is explored using Surface tension, neutron reflectivity and small angle neutron scattering. The results show that SDS exhibits a similar progressive evolution in Surface structures with increasing AlCl3 concentrations, as observed in SLES and related SAES surfactants, and in MES, sodium methyl ester dodecyl sulfonate surfactant. However in the SLES / SDS mixtures the structural evolution is different, and more complex pattern with increasing AlCl3 concentration is observed. The initial transition from monolayer to bilayer / trilayer structures exists, but the Surface at higher AlCl3 concentration reverts to monolayer adsorption before extended multilayer structures are formed. Complementary small angle neutron scattering measurements indicate a more complex evolution in the micelle structure which broadly correlates with the Surface behaviour. The results illustrate how subtle changes in headgroup structure and packing affect relative counterion binding and hence the Surface and solution structures. The results reinforce and extend the observations of related structures on different SAES and AES surfactants, and highlight the opportunity for manipulating Surface adsorption behaviour with surfactant mixtures.
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multivalent electrolyte Induced Surface ordering and solution self assembly in anionic surfactant mixtures sodium dodecyl sulfate and sodium diethylene glycol monododecyl sulfate
Journal of Colloid and Interface Science, 2020Co-Authors: Peixun Li, Mario Campana, Jeff Penfold, Zi Wang, Robert J Thomas, John R. P. Webster, Yao Chen, Adam L WashingtonAbstract:Abstract The formation of Surface multilayer structures, with the addition of multivalent electrolytes, has been observed in a range of different anionic surfactants; and notably the sodium oxyethylene glycol alkyl sulfate, SAES, and alkyl ester sulfonate, AES, surfactants. The addition of increasing amounts of AlCl3 results in increasing Surface layering, with a transition from monolayer to bilayer to ultimately more extended multilayer structures at the interface. The headgroup structures of these SAES and AES surfactants and their hydrophilic / hydrophobic balance give a degree of tolerance to the precipitation Induced by multivalent counterions. This was considered to be important factor associated with the multivalent counterion Induced Surface layering. In this paper the impact of sodium dodecyl sulfate, SDS, an anionic surfactant more susceptible to precipitation in the presence of multivalent counterions, on the Surface multilayer formation and solution self-assembly of sodium diethylene glycol monododecyl sulfate, SLES, is explored using Surface tension, neutron reflectivity and small angle neutron scattering. The results show that SDS exhibits a similar progressive evolution in Surface structures with increasing AlCl3 concentrations, as observed in SLES and related SAES surfactants, and in MES, sodium methyl ester dodecyl sulfonate surfactant. However in the SLES / SDS mixtures the structural evolution is different, and more complex pattern with increasing AlCl3 concentration is observed. The initial transition from monolayer to bilayer / trilayer structures exists, but the Surface at higher AlCl3 concentration reverts to monolayer adsorption before extended multilayer structures are formed. Complementary small angle neutron scattering measurements indicate a more complex evolution in the micelle structure which broadly correlates with the Surface behaviour. The results illustrate how subtle changes in headgroup structure and packing affect relative counterion binding and hence the Surface and solution structures. The results reinforce and extend the observations of related structures on different SAES and AES surfactants, and highlight the opportunity for manipulating Surface adsorption behaviour with surfactant mixtures.
Zi Wang - One of the best experts on this subject based on the ideXlab platform.
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multivalent electrolyte Induced Surface ordering and solution self assembly in anionic surfactant mixtures sodium dodecyl sulfate and sodium diethylene glycol monododecyl sulfate
Journal of Colloid and Interface Science, 2020Co-Authors: Peixun Li, Mario Campana, Jeff Penfold, Zi Wang, Robert J Thomas, John R. P. Webster, Yao Chen, Adam L WashingtonAbstract:Abstract The formation of Surface multilayer structures, with the addition of multivalent electrolytes, has been observed in a range of different anionic surfactants; and notably the sodium oxyethylene glycol alkyl sulfate, SAES, and alkyl ester sulfonate, AES, surfactants. The addition of increasing amounts of AlCl3 results in increasing Surface layering, with a transition from monolayer to bilayer to ultimately more extended multilayer structures at the interface. The headgroup structures of these SAES and AES surfactants and their hydrophilic / hydrophobic balance give a degree of tolerance to the precipitation Induced by multivalent counterions. This was considered to be important factor associated with the multivalent counterion Induced Surface layering. In this paper the impact of sodium dodecyl sulfate, SDS, an anionic surfactant more susceptible to precipitation in the presence of multivalent counterions, on the Surface multilayer formation and solution self-assembly of sodium diethylene glycol monododecyl sulfate, SLES, is explored using Surface tension, neutron reflectivity and small angle neutron scattering. The results show that SDS exhibits a similar progressive evolution in Surface structures with increasing AlCl3 concentrations, as observed in SLES and related SAES surfactants, and in MES, sodium methyl ester dodecyl sulfonate surfactant. However in the SLES / SDS mixtures the structural evolution is different, and more complex pattern with increasing AlCl3 concentration is observed. The initial transition from monolayer to bilayer / trilayer structures exists, but the Surface at higher AlCl3 concentration reverts to monolayer adsorption before extended multilayer structures are formed. Complementary small angle neutron scattering measurements indicate a more complex evolution in the micelle structure which broadly correlates with the Surface behaviour. The results illustrate how subtle changes in headgroup structure and packing affect relative counterion binding and hence the Surface and solution structures. The results reinforce and extend the observations of related structures on different SAES and AES surfactants, and highlight the opportunity for manipulating Surface adsorption behaviour with surfactant mixtures.
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multivalent electrolyte Induced Surface ordering and solution self assembly in anionic surfactant mixtures sodium dodecyl sulfate and sodium diethylene glycol monododecyl sulfate
Journal of Colloid and Interface Science, 2020Co-Authors: Peixun Li, Mario Campana, Jeff Penfold, Zi Wang, Robert J Thomas, John R. P. Webster, Yao Chen, Adam L WashingtonAbstract:Abstract The formation of Surface multilayer structures, with the addition of multivalent electrolytes, has been observed in a range of different anionic surfactants; and notably the sodium oxyethylene glycol alkyl sulfate, SAES, and alkyl ester sulfonate, AES, surfactants. The addition of increasing amounts of AlCl3 results in increasing Surface layering, with a transition from monolayer to bilayer to ultimately more extended multilayer structures at the interface. The headgroup structures of these SAES and AES surfactants and their hydrophilic / hydrophobic balance give a degree of tolerance to the precipitation Induced by multivalent counterions. This was considered to be important factor associated with the multivalent counterion Induced Surface layering. In this paper the impact of sodium dodecyl sulfate, SDS, an anionic surfactant more susceptible to precipitation in the presence of multivalent counterions, on the Surface multilayer formation and solution self-assembly of sodium diethylene glycol monododecyl sulfate, SLES, is explored using Surface tension, neutron reflectivity and small angle neutron scattering. The results show that SDS exhibits a similar progressive evolution in Surface structures with increasing AlCl3 concentrations, as observed in SLES and related SAES surfactants, and in MES, sodium methyl ester dodecyl sulfonate surfactant. However in the SLES / SDS mixtures the structural evolution is different, and more complex pattern with increasing AlCl3 concentration is observed. The initial transition from monolayer to bilayer / trilayer structures exists, but the Surface at higher AlCl3 concentration reverts to monolayer adsorption before extended multilayer structures are formed. Complementary small angle neutron scattering measurements indicate a more complex evolution in the micelle structure which broadly correlates with the Surface behaviour. The results illustrate how subtle changes in headgroup structure and packing affect relative counterion binding and hence the Surface and solution structures. The results reinforce and extend the observations of related structures on different SAES and AES surfactants, and highlight the opportunity for manipulating Surface adsorption behaviour with surfactant mixtures.
Yung Chang - One of the best experts on this subject based on the ideXlab platform.
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zwitterionic sulfobetaine grafted poly vinylidene fluoride membrane with highly effective blood compatibility via atmospheric plasma Induced Surface copolymerization
ACS Applied Materials & Interfaces, 2011Co-Authors: Yung Chang, Wanju Chang, Yuju Shih, Tachin Wei, Gingho HsiueAbstract:Development of nonfouling membranes to prevent nonspecific protein adsorption and platelet adhesion is critical for many biomedical applications. It is always a challenge to control the Surface graft copolymerization of a highly polar monomer from the highly hydrophobic Surface of a fluoropolymer membrane. In this work, the blood compatibility of poly(vinylidene fluoride) (PVDF) membranes with Surface-grafted electrically neutral zwitterionic poly(sulfobetaine methacrylate) (PSBMA), from atmospheric plasma-Induced Surface copolymerization, was studied. The effect of Surface composition and graft morphology, electrical neutrality, hydrophilicity and hydration capability on blood compatibility of the membranes were determined. Blood compatibility of the zwitterionic PVDF membranes was systematically evaluated by plasma protein adsorption, platelet adhesion, plasma-clotting time, and blood cell hemolysis. It was found that the nonfouling nature and hydration capability of grafted PSBMA polymers can be effect...
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hemocompatibility of poly vinylidene fluoride membrane grafted with network like and brush like antifouling layer controlled via plasma Induced Surface pegylation
Langmuir, 2011Co-Authors: Yung Chang, Yuju Shih, Jhengfong Jhong, Yingling Liu, Tachin WeiAbstract:In this work, the hemocompatibility of PEGylated poly(vinylidene fluoride) (PVDF) microporous membranes with varying grafting coverage and structures via plasma-Induced Surface PEGylation was studied. Network-like and brush-like PEGylated layers on PVDF membrane Surfaces were achieved by low-pressure and atmospheric plasma treatment. The chemical composition, physical morphology, grafting structure, Surface hydrophilicity, and hydration capability of prepared membranes were determined to illustrate the correlations between grafting qualities and hemocompatibility of PEGylated PVDF membranes in contact with human blood. Plasma protein adsorption onto different PEGylated PVDF membranes from single-protein solutions and the complex medium of 100% human plasma were measured by enzyme-linked immunosorbent assay (ELISA) with monoclonal antibodies. Hemocompatibility of the PEGylated membranes was evaluated by the antifouling property of platelet adhesion observed by scanning electron microscopy (SEM) and the anticoagulant activity of the blood coagulant determined by testing plasma-clotting time. The control of grafting structures of PEGylated layers highly regulates the PVDF membrane to resist the adsorption of plasma proteins, the adhesion of platelets, and the coagulation of human plasma. It was found that PVDF membranes grafted with brush-like PEGylated layers presented higher hydration capability with binding water molecules than with network-like PEGylated layers to improve the hemocompatible character of plasma protein and blood platelet resistance in human blood. This work suggests that the hemocompatible nature of grafted PEGylated polymers by controlling grafting structures gives them great potential in the molecular design of antithrombogenic membranes for use in human blood.
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zwitterionic sulfobetaine grafted poly vinylidene fluoride membrane with highly effective blood compatibility via atmospheric plasma Induced Surface copolymerization
ACS Applied Materials & Interfaces, 2011Co-Authors: Yung Chang, Wanju Chang, Yuju Shih, Tachin Wei, Gingho HsiueAbstract:Development of nonfouling membranes to prevent nonspecific protein adsorption and platelet adhesion is critical for many biomedical applications. It is always a challenge to control the Surface graft copolymerization of a highly polar monomer from the highly hydrophobic Surface of a fluoropolymer membrane. In this work, the blood compatibility of poly(vinylidene fluoride) (PVDF) membranes with Surface-grafted electrically neutral zwitterionic poly(sulfobetaine methacrylate) (PSBMA), from atmospheric plasma-Induced Surface copolymerization, was studied. The effect of Surface composition and graft morphology, electrical neutrality, hydrophilicity and hydration capability on blood compatibility of the membranes were determined. Blood compatibility of the zwitterionic PVDF membranes was systematically evaluated by plasma protein adsorption, platelet adhesion, plasma-clotting time, and blood cell hemolysis. It was found that the nonfouling nature and hydration capability of grafted PSBMA polymers can be effectively controlled by regulating the grafting coverage and charge balance of the PSBMA layer on the PVDF membrane Surface. Even a slight charge bias in the grafted zwitterionic PSBMA layer can induce electrostatic interactions between proteins and the membrane Surfaces, leading to Surface protein adsorption, platelet activation, plasma clotting and blood cell hemolysis. Thus, the optimized PSBMA Surface graft layer in overall charge neutrality has a high hydration capability and the best antifouling, anticoagulant, and antihemolytic activities when comes into contact with human blood.
Gingho Hsiue - One of the best experts on this subject based on the ideXlab platform.
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zwitterionic sulfobetaine grafted poly vinylidene fluoride membrane with highly effective blood compatibility via atmospheric plasma Induced Surface copolymerization
ACS Applied Materials & Interfaces, 2011Co-Authors: Yung Chang, Wanju Chang, Yuju Shih, Tachin Wei, Gingho HsiueAbstract:Development of nonfouling membranes to prevent nonspecific protein adsorption and platelet adhesion is critical for many biomedical applications. It is always a challenge to control the Surface graft copolymerization of a highly polar monomer from the highly hydrophobic Surface of a fluoropolymer membrane. In this work, the blood compatibility of poly(vinylidene fluoride) (PVDF) membranes with Surface-grafted electrically neutral zwitterionic poly(sulfobetaine methacrylate) (PSBMA), from atmospheric plasma-Induced Surface copolymerization, was studied. The effect of Surface composition and graft morphology, electrical neutrality, hydrophilicity and hydration capability on blood compatibility of the membranes were determined. Blood compatibility of the zwitterionic PVDF membranes was systematically evaluated by plasma protein adsorption, platelet adhesion, plasma-clotting time, and blood cell hemolysis. It was found that the nonfouling nature and hydration capability of grafted PSBMA polymers can be effect...
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zwitterionic sulfobetaine grafted poly vinylidene fluoride membrane with highly effective blood compatibility via atmospheric plasma Induced Surface copolymerization
ACS Applied Materials & Interfaces, 2011Co-Authors: Yung Chang, Wanju Chang, Yuju Shih, Tachin Wei, Gingho HsiueAbstract:Development of nonfouling membranes to prevent nonspecific protein adsorption and platelet adhesion is critical for many biomedical applications. It is always a challenge to control the Surface graft copolymerization of a highly polar monomer from the highly hydrophobic Surface of a fluoropolymer membrane. In this work, the blood compatibility of poly(vinylidene fluoride) (PVDF) membranes with Surface-grafted electrically neutral zwitterionic poly(sulfobetaine methacrylate) (PSBMA), from atmospheric plasma-Induced Surface copolymerization, was studied. The effect of Surface composition and graft morphology, electrical neutrality, hydrophilicity and hydration capability on blood compatibility of the membranes were determined. Blood compatibility of the zwitterionic PVDF membranes was systematically evaluated by plasma protein adsorption, platelet adhesion, plasma-clotting time, and blood cell hemolysis. It was found that the nonfouling nature and hydration capability of grafted PSBMA polymers can be effectively controlled by regulating the grafting coverage and charge balance of the PSBMA layer on the PVDF membrane Surface. Even a slight charge bias in the grafted zwitterionic PSBMA layer can induce electrostatic interactions between proteins and the membrane Surfaces, leading to Surface protein adsorption, platelet activation, plasma clotting and blood cell hemolysis. Thus, the optimized PSBMA Surface graft layer in overall charge neutrality has a high hydration capability and the best antifouling, anticoagulant, and antihemolytic activities when comes into contact with human blood.