Structural and optical properties of two-dimensional gadolinium stearate Langmuir monolayer

Maiti, Santanu K.; Sanyal, M. K.; Mukhopadhyay, Mrinmay K.; Singh, Arnab; Mukherjee, Smita; Fontaine, Philippe

doi:10.1016/j.cplett.2018.10.003

Cited by 13 publications

(25 citation statements)

References 31 publications

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“…In Figure c, we have shown the 30 mN/m data (black circles) and marked this tail–tail (T–T) peak as B. This well-known 2D hexagonal ordering allows typically 0.2 nm 2 in-plane area for the organic tail of a DMV molecule. Due to the presence of carboxylate ions on the CS molecules, only a certain orientation of the linear DMV–CS supramolecular micelle is possible to minimize the electrostatic repulsion at higher surface pressure.…”

Section: Resultsmentioning

confidence: 88%

“…The GID data taken at higher surface pressure reveal further structural evolution in the molecular layer formed at the air–water interface. The intensities of the head–head peaks A and C diminish as the pressure is increased beyond 15 mN/m and then the well-known peak corresponding to 2D hexagonal ordering of hydrophobic tails of DMV molecules (Figure a) appears at q xy = 15.3 nm –1 . In Figure c, we have shown the 30 mN/m data (black circles) and marked this tail–tail (T–T) peak as B.…”

Section: Resultsmentioning

confidence: 94%

“…We have used here the grazing incidence diffraction (GID) technique to probe 2D ordering of molecular monolayers at the air–water interface as the penetration of X-ray beam can be reduced drastically by using angle of incidence close to the critical angle of the water surface . It should be mentioned here that GID studies on the liquid surface required special spectrometers to bend the X-ray beam down to control the grazing angle of incidence. − …”

Section: Methodsmentioning

confidence: 99%

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Formation of Two-Dimensional Network of Organic Charge-Transfer Complexes at the Air–Water Interface

et al. 2019

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The air−water interface is an ideal platform to produce two-dimensional (2D) structures involving anything from simple organic molecules to supramolecular moieties by exploiting hydrophobic−hydrophilic interactions. Here, we show, using grazing incidence X-ray scattering, the formation of a 2D ordered structure of a charge-transfer (C-T) complex, namely, dodecyl methyl viologen (DMV) as acceptor and coronene tetracarboxylate potassium salt (CS) as donor, at the air−water interface. We have observed a phase transition in the 2D ordered structure as the area per molecule is decreased with increasing surface pressure in a Langmuir trough. The high-pressure ordering of the hydrocarbon chains associated with DMV destroys long-range C-T conjugation of DMV and CS at the air−water interface. Our results also explain the formation of DMV−CS cylindrical reverse micelles and eventually long nanowires that get formed in the self-assembly process in the bulk medium to preserve both the C-T conjugation and the organic tail−tail organization.

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Section: Resultsmentioning

confidence: 88%

Section: Resultsmentioning

confidence: 94%

Section: Methodsmentioning

confidence: 99%

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Formation of Two-Dimensional Network of Organic Charge-Transfer Complexes at the Air–Water Interface

et al. 2019

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“…In last few decades, various X-ray scattering techniques have been used to investigate the myelin sheath in nerve fibers 30 , 31 , 33 , 51 – 53 . X-rays measure the electron density contrast (number of electrons present in the atoms) of the sample 54 and determine distinct structural features of intermodal myelin: the lipid polar head group layers, the hydrocarbon tails of the bilayer and the aqueous spaces 55 . The scattering power of X-rays for the three basic elements (O, C and N) present in biological samples is very similar, therefore, X-rays cannot distinguish between these elements and determine an average of a heterogeneous membrane along the plane of the bilayer.…”

Section: Discussionmentioning

confidence: 99%

Distribution and orientation of nerve fibers and myelin assembly in a brain section retrieved by small-angle neutron scattering

Maiti

Frielinghaus

Gräßel

et al. 2021

Sci Rep

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The structural connectivity of the brain has been addressed by various imaging techniques such as diffusion weighted magnetic resonance imaging (DWMRI) or specific microscopic approaches based on histological staining or label-free using polarized light (e.g., three-dimensional Polarized Light Imaging (3D-PLI), Optical Coherence Tomography (OCT)). These methods are sensitive to different properties of the fiber enwrapping myelin sheaths i.e. the distribution of myelin basic protein (histology), the apparent diffusion coefficient of water molecules restricted in their movements by the myelin sheath (DWMRI), and the birefringence of the oriented myelin lipid bilayers (3D-PLI, OCT). We show that the orientation and distribution of nerve fibers as well as myelin in thin brain sections can be determined using scanning small angle neutron scattering (sSANS). Neutrons are scattered from the fiber assembly causing anisotropic diffuse small-angle scattering and Bragg peaks related to the highly ordered periodic myelin multilayer structure. The scattering anisotropy, intensity, and angular position of the Bragg peaks can be mapped across the entire brain section. This enables mapping of the fiber and myelin distribution and their orientation in a thin brain section, which was validated by 3D-PLI. The experiments became possible by optimizing the neutron beam collimation to highest flux and enhancing the myelin contrast by deuteration. This method is very sensitive to small microstructures of biological tissue and can directly extract information on the average fiber orientation and even myelin membrane thickness. The present results pave the way toward bio-imaging for detecting structural aberrations causing neurological diseases in future.

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“…[1][2][3] A combination of Grazing Incidence X-ray Diffraction (GIXD), specular x-ray reflectivity (XR) and more recently electrochemical scanning tunneling microscopy (EC-STM) of Langmuir-Blodgett (LB) monolayers have been used to understand different kinds of phase transitions, molecular structure and orientation within domains, formation of single layer and bilayers. [4][5][6][7][8] Mixed systems like lipid-cholesterol and lipid-peptide monolayers have been studied to probe the interactions of lipids with other molecules and their relative orientation. [9][10][11][12][13][14] Alamethicin is an antimicrobial peptide, produced by many living organisms to defend against gram-negative and gram-positive bacteria, fungi, enveloped viruses, eukaryotic parasites, and even tumor cells.…”

Section: Introductionmentioning

confidence: 99%

Grazing incidence x-ray diffraction studies of lipid-peptide mixed monolayers during shear flow

Bera,

Kandar,

Krishnaswamy

et al. 2019

Preprint

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Grazing Incidence X-ray Diffraction (GIXD) studies of monolayers of biomolecules at the air-water interface give quantitative information of in-plane packing, coherence lengths of the ordered (diffracting) domains and orientation of hydrocarbon chains of the model membranes. Rheo-GIXD measurements revel quantitative changes in the monolayer under shear.Here we report GIXD studies of monolayers of Alamethicin peptide, DPPC lipid and their mixtures at the air-water interface under the application of steady shear stresses. The Alamethicin monolayer and the mixed monolayer show flow jamming transition. On the other hand, pure DPPC monolayer under the constant stress flows steadily with a notable enhancement of 1

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Structural and optical properties of two-dimensional gadolinium stearate Langmuir monolayer

Cited by 13 publications

References 31 publications

Formation of Two-Dimensional Network of Organic Charge-Transfer Complexes at the Air–Water Interface

Formation of Two-Dimensional Network of Organic Charge-Transfer Complexes at the Air–Water Interface

Distribution and orientation of nerve fibers and myelin assembly in a brain section retrieved by small-angle neutron scattering

Grazing incidence x-ray diffraction studies of lipid-peptide mixed monolayers during shear flow

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