Lyotropic liquid crystals of tetradecyldimethylaminoxide in water and the in situ formation of gold nanomaterials

Zhang, Na; Xu, Aoxue; Liu, Baoyong; Godbert, Nicolas; Li, Hongguang

doi:10.1016/j.chphma.2022.06.001

Cited by 4 publications

(4 citation statements)

References 33 publications

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“…1(a)), the lamellar L a structure (the liquid crystalline bilayer phase with non-tilted sheets and disordered hydrocarbon chains 60 ) was accompanied by opaque crystalline domains that interacted differently with light. 61,62 At room temperature (20 1C) and 35 1C, oily streaks and multilamellar vesicles (MLVs) could be seen (Fig. 1(b) and (c)) which were indicative of the L a structure.…”

Section: Resultsmentioning

confidence: 99%

“…Fig.1shows the temperature-dependent microstructure evolution and Fig.2displays the shear-dependent flow behavior of the concentrated SLES solution maintained at various temperatures. At 5 1C (Fig.1(a)), the lamellar L a structure (the liquid crystalline bilayer phase with non-tilted sheets and disordered hydrocarbon chains60 ) was accompanied by opaque crystalline domains that interacted differently with light 61,62. At room temperature (20 1C) and 35 1C, oily streaks and multilamellar vesicles (MLVs) could be seen (Fig.1(b) and (c)) which were indicative of the L a structure 16.…”

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confidence: 98%

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Effects of shear-induced crystallization on the complex viscosity of lamellar-structured concentrated surfactant solutions

Kelkar,

Kaboolian,

Corder

et al. 2024

Soft Matter

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Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 98%

Effects of shear-induced crystallization on the complex viscosity of lamellar-structured concentrated surfactant solutions

Kelkar,

Kaboolian,

Corder

et al. 2024

Soft Matter

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“…Solutions formed with amphiphilic molecules form micelles due to their self-assembly properties, and these micelles form ordered mesophases called lyotropic liquid crystals (LLCs) [1][2][3]. The micelles that come together may have packaging geometries to form cubic, lamellar, and hexagonal structures, depending on the interactions between them [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Polymer Additive on the Lyotropic Lamellar Phase Formed by Surfactants with Different Head Groups

Cukurkent,

MASALCI

2024

Preprint

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In this study, the effect of polyvinylpyrrolidone (PVP) polymer on lyotropic lamellar phases obtained using different types of surfactants, anionic and cationic, was compared. Three different methods were used to make these comparisons. The polarized microscope (POM) method was used to observe and compare morphological changes. It was observed that the texture structures of the lyotropic lamellae phases obtained by using anionic and cationic surfactants were different from each other. Structural changes were investigated by the small-angle X-ray scattering (SAXS) method. As the polymer concentration added to the lyotropic lamellae phase(s) increased, it was determined that the structural changes of the anionic and cationic samples were different from each other. The interactions of surfactant-polymer molecules with each other and their packaging were accordingly investigated by Fourier transform infrared spectroscopy (FTIR). How the polymer was added to the lyotropic lamellae phase and how the surfactant interacted with the chain and head groups was determined by examining the frequency shifts of the methylene chains and head groups. These frequency shifts provide information about trans-gauche transformations. Both polymers and lyotropic lamellae phases have wide biological and technological uses. For this reason, their use together, that is, the interactions of polymer doped-lamellar phases, is interesting and should be understood.

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“…Gold nanoparticles are widely used in the manufacture of numerous products, from electronics to biomedical devices [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 ]. In particular, they have raised high interest in cell biology and biomedicine due to their unique chemical, optical and electronic properties that result from their minute size [ 10 , 11 , 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

Light-Induced Clusterization of Gold Nanoparticles: A New Photo-Triggered Antibacterial against E. coli Proliferation

et al. 2023

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Metallic nanoparticles show plasmon resonance phenomena when irradiated with electromagnetic radiation of a suitable wavelength, whose value depends on their composition, size, and shape. The damping of the surface electron oscillation causes a release of heat, which causes a large increase in local temperature. Furthermore, this increase is enhanced when nanoparticle aggregation phenomena occur. Local temperature increase is extensively exploited in photothermal therapy, where light is used to induce cellular damage. To activate the plasmon in the visible range, we synthesized 50 nm diameter spherical gold nanoparticles (AuNP) coated with polyethylene glycol and administered them to an E. coli culture. The experiments were carried out, at different gold nanoparticle concentrations, in the dark and under irradiation. In both cases, the nanoparticles penetrated the bacterial wall, but a different toxic effect was observed; while in the dark we observed an inhibition of bacterial growth of 46%, at the same concentration, under irradiation, we observed a bactericidal effect (99% growth inhibition). Photothermal measurements and SEM observations allowed us to conclude that the extraordinary effect is due to the formation, at low concentrations, of a light-induced cluster of gold nanoparticles, which does not form in the absence of bacteria, leading us to the conclusion that the bacterium wall catalyzes the formation of these clusters which are ultimately responsible for the significant increase in the measured temperature and cause of the bactericidal effect. This photothermal effect is achieved by low-power irradiation and only in the presence of the pathogen: in its absence, the lack of gold nanoparticles clustering does not lead to any phototoxic effect. Therefore, it may represent a proof of concept of an innovative nanoscale pathogen responsive system against bacterial infections.

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Lyotropic liquid crystals of tetradecyldimethylaminoxide in water and the in situ formation of gold nanomaterials

Cited by 4 publications

References 33 publications

Effects of shear-induced crystallization on the complex viscosity of lamellar-structured concentrated surfactant solutions

Effects of shear-induced crystallization on the complex viscosity of lamellar-structured concentrated surfactant solutions

Investigation of the Polymer Additive on the Lyotropic Lamellar Phase Formed by Surfactants with Different Head Groups

Light-Induced Clusterization of Gold Nanoparticles: A New Photo-Triggered Antibacterial against E. coli Proliferation

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