Annular and threadlike wormlike micelles formed by a bio-based surfactant containing an extremely large hydrophobic group

Soft Matter ◽  
2018 ◽  
Vol 14 (4) ◽  
pp. 499-507 ◽  
Author(s):  
Zhaolan Zhai ◽  
Xinyan Yan ◽  
Zhanqian Song ◽  
Shibin Shang ◽  
Xiaoping Rao
Keyword(s):  
Alkyl Chain ◽  
Wormlike Micelles ◽  
Hydrophobic Group ◽  
Spherical Micelles ◽  
Threadlike Micelles ◽  
Large Spherical ◽  
Rigid Group

The overlap of an alkyl chain and a rigid group in C12-MPA-Na promotes the formation of large spherical micelles and annular and threadlike micelles.

Photo-induced transformation of wormlike micelles to spherical micelles in aqueous solution

Soft Matter ◽  
2012 ◽  
Vol 8 (30) ◽  
pp. 7858 ◽  
Author(s):  
Jun Li ◽  
Mingwei Zhao ◽  
Hongtao Zhou ◽  
Hejun Gao ◽  
Liqiang Zheng
Keyword(s):  
Aqueous Solution ◽  
Wormlike Micelles ◽  
Spherical Micelles

scholarly journals Converse transitions between the micelles and the vesicles of pyrrolidone-based AIE amphiphilic copolymers in polar and apolar solvents

RSC Advances ◽  
2019 ◽  
Vol 9 (48) ◽  
pp. 28102-28111 ◽  
Author(s):  
Xiaolong He ◽  
Beibei Wang ◽  
Xuefeng Li ◽  
Jinfeng Dong
Keyword(s):  
Wormlike Micelles ◽  
Amphiphilic Copolymers ◽  
Spherical Micelles

A series of AIE-active amphiphilic copolymers, PNMPx-b-P(LMAy-co-TPEz), were developed as bioimaging probes. Converse transitions from spherical micelles to vesicles via wormlike micelles of them in water and n-dodecane were happened, respectively.

scholarly journals Dirhamnolipid ester – formation of reverse wormlike micelles in a binary (primerless) system

2020 ◽  
Vol 16 ◽  
pp. 2820-2830
Author(s):  
David Liese ◽  
Hans Henning Wenk ◽  
Xin Lu ◽  
Jochen Kleinen ◽  
Gebhard Haberhauer
Keyword(s):  
Alkyl Chain ◽  
Loss Modulus ◽  
Polarized Light ◽  
Maxwell Model ◽  
Wormlike Micelles ◽  
Cole Plot ◽  
Scanning Calorimetry ◽  
Dispersion Energy ◽  
Ester Formation ◽  
Transition Enthalpy

We report new dirhamnolipid ester forming reverse wormlike micelles in nonpolar solvents without the addition of any primer. Therefore, these compounds represent a rare case of a binary system showing this gel-like behavior. In this study, the influence of the concentration of the rhamnolipid ester and the ester alkyl chain length on the rheological properties of the reverse wormlike micelles in toluene was investigated in detail. Highly viscoelastic solutions were obtained even at a relatively low concentration of less than 1 wt %. The phase transition temperatures indicate that the formation of reverse wormlike micelles is favored for dirhamnolipid esters with shorter alkyl chain lengths. Oscillatory shear measurements for the viscoelastic samples reveal that the storage modulus (G') and the loss modulus (G'') cross each other and fit the Maxwell model very well in the low-ω region. As is typical for wormlike micelle systems, the normalized Cole–Cole plot of G''/G'' max against G'/G'' max was obtained as a semicircle centered at G'/G'' max = 1. The formation of network structures was also verified by polarized light microscopy. The sample was birefringent at ambient temperature and anisotropic at an elevated temperature. Differential scanning calorimetry analysis yielded a transition enthalpy of about ΔH SG/GS = ±7.2 kJ/mol. This value corresponds to a strong dispersion energy and explains the formation of the highly viscous gels by the entanglement of wormlike micelles through the interaction of the alkyl chains.

Rheological Study of Gemini Surfactants with Amide Groups

2021 ◽  
Vol 58 (3) ◽  
pp. 195-203
Author(s):  
Zheng Zhu ◽  
Xiaohao Lu ◽  
Liangliang Lin ◽  
Hujun Xu ◽  
Haiyan Gao
Keyword(s):  
Surfactant Concentration ◽  
Hydrodynamic Radius ◽  
Inorganic Salt ◽  
Sodium Salicylate ◽  
Gemini Surfactants ◽  
Organic Salt ◽  
Wormlike Micelles ◽  
Linkage Groups ◽  
Hydrophobic Group ◽  
M 12

Abstract In the present study, the micelle aggregation numbers and hydrodynamic radius distributions of the gemini surfactants (abbreviated as Cm-(EO)n-E-Cm (m = 12–16, n = 1, 2)) were investigated by fluorescence spectroscopy and dynamic light scattering (DLS). The rheological properties of these surfactants were determined using a rheometer. The Surfactants C14-(EO)-E-C14 and C16-(EO)-E-C16 formed worm-like micelles at a concentration of 200 mmol/L. It was found that longer hydrophobic chains or shorter linkage groups promoted the growth of worm-like micelles. Then, the influence of the inorganic salt NaBr and the organic salt sodium salicylate (NaSal) on the formation and properties of wormlike micelles in aqueous C16-(EO)-E-C16 solutions at a surfactant concentration of 20 mmol/L was investigated. The results showed that NaSal could penetrate deeper into the hydrophobic group of the micelle due to its good hydrophobic interaction, which promoted micelle growth and resulted in worm-like micelles. In addition, the tested systems showed a Maxwell behavior at lower frequencies, but deviated from the Maxwell mode at higher frequencies. Finally, the formation of worm-like micelles was also verified by micro polarity measurements.

Electron-diffraction studies of amorphous carbon thin films

1993 ◽  
Vol 51 ◽  
pp. 1100-1101
Author(s):  
David A. Muller
Keyword(s):  
Thin Films ◽  
Electron Diffraction ◽  
Amorphous Carbon ◽  
Glassy Carbon ◽  
Spherical Structure ◽  
Local Ordering ◽  
Carbon Arc ◽  
Similar Appearance ◽  
Carbon Thin Films ◽  
Large Spherical

The sp2 rich amorphous carbons have a wide variety of microstructures ranging from flat sheetlike structures such as glassy carbon to highly curved materials having similar local ordering to the fullerenes. These differences are most apparent in the region of the graphite (0002) reflection of the energy filtered diffracted intensity obtained from these materials (Fig. 1). All these materials consist mainly of threefold coordinated atoms. This accounts for their similar appearance above 0.8 Å-1. The fullerene curves (b,c) show a string of peaks at distance scales corresponding to the packing of the large spherical and oblate molecules. The beam damaged C60 (c) shows an evolution to the sp2 amorphous carbons as the spherical structure is destroyed although the (220) reflection in fee fcc at 0.2 Å-1 does not disappear completely. This 0.2 Å-1 peak is present in the 1960 data of Kakinoki et. al. who grew films in a carbon arc under conditions similar to those needed to form fullerene rich soots.

Template mediated crystal engineering

1994 ◽  
Vol 52 ◽  
pp. 480-481
Author(s):  
Brigid R. Heywood ◽  
S. Champ
Keyword(s):  
Crystal Engineering ◽  
Electrostatic Interactions ◽  
Alkyl Chain ◽  
Crystallographic Axis ◽  
Two Dimensional ◽  
Engineering Process ◽  
Solution Interface ◽  
Extensive Program ◽  
Geometric Homology ◽  
Long Alkyl Chain

Recent work on the crystallisation of inorganic crystals under compressed monomolecular surfactant films has shown that two dimensional templates can be used to promote the oriented nucleation of solids. When a suitable long alkyl chain surfactant is cast on the crystallisation media a monodispersied population of crystals forms exclusively at the monolayer/solution interface. Each crystal is aligned with a specific crystallographic axis perpendicular to the plane of the monolayer suggesting that nucleation is facilitated by recognition events between the nascent inorganic solid and the organic template.For example, monolayers of the long alkyl chain surfactant, stearic acid will promote the oriented nucleation of the calcium carbonate polymorph, calcite, on the (100) face, whereas compressed monolayers of n-eicosyl sulphate will induce calcite nucleation on the (001) face, (Figure 1 & 2). An extensive program of research has confirmed the general principle that molecular recognition events at the interface (including electrostatic interactions, geometric homology, stereochemical complementarity) can be used to promote the crystal engineering process.

New Structure of CTAB Templated Silica Films as revealed by GISAXS coupled to HRTEM

2000 ◽  
Vol 628 ◽  
Author(s):  
Sophie Besson ◽  
Catherine Jacquiod ◽  
Thierry Gacoin ◽  
André Naudon ◽  
Christian Ricolleau ◽  
...  
Keyword(s):  
Cetyltrimethylammonium Bromide ◽  
Grazing Incidence ◽  
Hexagonal Structure ◽  
X Ray Diffraction ◽  
Electronic Microscopy ◽  
Silica Films ◽  
X Ray ◽  
X Ray Scattering ◽  
Hexagonal Arrangement ◽  
Spherical Micelles

ABSTRACTA microstructural study on surfactant templated silica films is performed by coupling traditional X-Ray Diffraction (XRD) and Transmission Electronic Microscopy (TEM) to Grazing Incidence Small Angle X-Ray Scattering (GISAXS). By this method it is shown that spin-coating of silicate solutions with cationic surfactant cetyltrimethylammonium bromide (CTAB) as a templating agent provides 3D hexagonal structure (space group P63/mmc) that is no longer compatible with the often described hexagonal arrangement of tubular micelles but rather with an hexagonal arrangement of spherical micelles. The extent of the hexagonal ordering and the texture can be optimized in films by varying the composition of the solution.

Dispersibility Evaluation of Graphene Oxides with Alkyl Chain Groups by Using Optical Transparency

2015 ◽  
Vol E98.C (2) ◽  
pp. 127-128 ◽  
Author(s):  
Asami OHTAKE ◽  
Seiko UCHINO ◽  
Kunio AKEDO ◽  
Masanao ERA ◽  
Koichi SAKAGUCHI
Keyword(s):  
Alkyl Chain ◽  
Optical Transparency ◽  
Graphene Oxides
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