scholarly journals Fluid Interfaces

Coatings ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1000
Author(s):  
Eduardo Guzmán
Keyword(s):  
Oil Recovery ◽  
Self Assembly ◽  
Deep Understanding ◽  
Functional Materials ◽  
Fluid Interfaces ◽  
Dynamic Features ◽  
Physico Chemical ◽  
Structures And Properties ◽  
Different Types

Fluid interfaces are promising candidates for the design of new functional materials by confining different types of materials, e.g., polymers, surfactants, colloids, or even small molecules, by direct spreading or self-assembly from solutions. The development of such materials requires a deep understanding of the physico-chemical bases underlying the formation of layers at fluid interfaces, as well as the characterization of the structures and properties of such layers. This is of particular importance, because the constraints associated with the assembly of materials at the interface lead to the emergence of equilibrium and dynamic features in the interfacial systems that are far from those found in traditional 3D materials. These new properties are of importance in many scientific and technological fields, such as food science, cosmetics, biology, oil recovery, electronics, drug delivery, detergency, and tissue engineering. Therefore, the understanding of the theoretical and practical aspects involved in the preparation of these interfacial systems is of paramount importance for improving their usage for designing innovative technological solutions.

2D Self-assembly and Electronic Characterization of Oxygen-Boron-Oxygen-Doped Chiral Graphene Nanoribbons

2021 ◽  
Author(s):  
Lei Jin ◽  
Nerea Bilbao ◽  
Yang Lv ◽  
Xiao-Ye Wang ◽  
Soltani Paniz ◽  
...  
Keyword(s):  
Edge Effects ◽  
Self Assembly ◽  
Quantum Confinement ◽  
Graphene Nanoribbons ◽  
One Dimensional ◽  
The Past ◽  
Different Types

Graphene nanoribbons (GNRs), quasi-one-dimensional strips of graphene, exhibit a nonzero bandgap due to quantum confinement and edge effects. In the past decade, different types of GNRs with atomically precise structures...

scholarly journals Recent Progress in Hydrogen-Bonded π-Conjugated Systems Displaying J-Type Aggregates

2020 ◽  
Vol 02 (01) ◽  
pp. 047-063 ◽  
Author(s):  
Nelson Ricardo Ávila-Rovelo ◽  
Amparo Ruiz-Carretero
Keyword(s):  
Hydrogen Bonding ◽  
Self Assembly ◽  
Noncovalent Interactions ◽  
Functional Materials ◽  
Organic Electronic Devices ◽  
Conjugated Systems ◽  
Hydrogen Bonding Interactions ◽  
Different Types ◽  
J Aggregates ◽  
Additional Hydrogen

Supramolecular approaches are of great interest in the design of functional materials. The types of aggregates arising from different noncovalent interactions endow materials with intriguing properties. In this sense, J-type aggregates are very attractive due to their unique optical properties and capacity to transport excitons. These features make them great candidates in the design of materials for organic electronic devices. Furthermore, the incorporation of additional hydrogen-bonding functionalities provides J-aggregates with superior directionality and connection among the different π-conjugated cores. The control over the formation of H-bonds to achieve functional aggregates is therefore a promising strategy towards controlled structures with specific functions.This review outlines the most relevant and recent works of π-conjugated systems exhibiting J-type aggregates resulting from hydrogen-bonding interactions. Different types of hydrogen-bonding functionalities will be discussed together with their roles in the aggregate properties, their impact in the optoelectronic properties, the self-assembly mechanisms, and their applications in organic electronics.

scholarly journals Characterization of Complex Crude Oil Microemulsions-DSC Contribution

2018 ◽  
Vol 73 ◽  
pp. 3 ◽  
Author(s):  
Ayako Fukumoto ◽  
Christine Dalmazzone ◽  
Didier Frot ◽  
Loïc Barré ◽  
Christine Noïk
Keyword(s):  
Crude Oil ◽  
Oil Recovery ◽  
Continuous Phase ◽  
Morphological Characterization ◽  
Model System ◽  
Residual Oil ◽  
Surfactant Flooding ◽  
Interfacial Tensions ◽  
Physico Chemical

Surfactant flooding is a chemical enhanced oil recovery (EOR) process which consists in injecting optimized formulations of surfactants in the reservoir in order to remobilize the residual oil trapped in the pores of the rock. To do that, it is necessary to design specific formulations in order to get so-called Winsor III systems of very low interfacial tensions with the crude oil. Unfortunately, there is no well-established way to characterize and understand the physical properties and structures of microemulsions composed of crude oil and industrial surfactants due to their extreme complexity. In a previous work, we have developed a methodology based on the use of several techniques (DLS, MLS, SAXS, cryo-SEM, DSC, interfacial measurements, etc.) allowing physico-chemical and morphological characterization of these microemulsions in the case of a model system. In this article, we will demonstrate how DSC can be used to provide information on the physico-chemical composition of complex microemulsions (water and oil content, salinity, etc.) and on their morphology (continuous phase, dispersed phase, etc.).

Structural and physico-chemical characterization of a dirhamnolipid biosurfactant purified from Pseudomonas aeruginosa: application of crude biosurfactant in enhanced oil recovery

RSC Advances ◽  
2016 ◽  
Vol 6 (74) ◽  
pp. 70669-70681 ◽  
Author(s):  
Debananda Gogoi ◽  
Pabitra Bhagowati ◽  
Pronob Gogoi ◽  
Naba K. Bordoloi ◽  
Abu Rafay ◽  
...  
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Enhanced Oil Recovery ◽  
Oil Recovery ◽  
Structural Characterization ◽  
Contaminated Soil ◽  
Chemical Characterization ◽  
Biotechnological Application ◽  
Physico Chemical ◽  
Petroleum Oil

The present study describes the structural characterization and biotechnological application of a dirhamnolipid biosurfactant produced byPseudomonas aeruginosastrain NBTU-01 isolated from a petroleum oil-contaminated soil sample.

Tailoring and Characterization of the Liquid Crystalline Structure of Cellulose Nanocrystals for Opto-Electro-Mechanical Multifunctional Applications

2018 ◽  
Author(s):  
Inseok Chae ◽  
Amira Meddeb ◽  
Zoubeida Ounaies ◽  
Seong H. Kim
Keyword(s):  
Mechanical Properties ◽  
Electric Field ◽  
Smart Materials ◽  
Self Assembly ◽  
Liquid Crystalline ◽  
Functional Materials ◽  
Mechanical Force ◽  
Sum Frequency ◽  
Optical Process

Liquid crystalline (LC) behaviors of cellulose nanocrystal (CNC), derived from wood, cotton or other cellulose-based biopolymers, have been actively investigated due to their unique optical properties and their superb mechanical properties, which open up potential applications in bioelectronics and biomedical engineering. In particular, many attempts have been made to control phase and orientation of LC-CNCs because they are critical factors deciding optical and mechanical properties, and electromechanical performances. Through the applications of mechanical force, electric field and magnetic field, some degree of success has been achieved; however, realizing homogeneous arrangements of CNCs that can be exploited at the macroscale is still elusive, owing to a variety of intermolecular interactions. The characterizations of the LC phase and orientation of CNCs are also challenging due to their complex biological structures. In this report, we introduce approaches to control the phase and orientation of LC-CNCs through the self-assembly, mechanical force and electric field. The liquid crystalline behaviors of CNCs in polar solvents and at the air/water interface are discussed. Translational and rotational behaviors of CNCs under DC electric field are also investigated as a function of their surface charge and dipole moment. In addition, we introduce a nonlinear optical process, namely, sum frequency generation (SFG) spectroscopy, for the structural characterization of LC-CNCs. Using SFG, we can analyze not only crystal phase and structure, but also polar ordering of CNCs which plays a key role in determining their electromechanical performances. Development of cellulose-based smart materials will expand the spectrum of available functional materials that are lightweight, flexible, mechanically tough, and thermally stable at moderately high temperatures (up to 300°C).

Self-Assembly of Cyclic Dipeptides: Platforms for Functional Materials

2020 ◽  
Vol 27 (8) ◽  
pp. 688-697
Author(s):  
Yu Chen ◽  
Kai Tao ◽  
Wei Ji ◽  
Pandeeswar Makam ◽  
Sigal Rencus-Lazar ◽  
...  
Keyword(s):  
Self Assembly ◽  
Functional Materials ◽  
Building Blocks ◽  
Cyclic Dipeptide ◽  
Design Synthesis ◽  
Cyclic Dipeptides ◽  
The Past ◽  
Supramolecular Architectures ◽  
Structural Rigidity

Supramolecular self-assembled functional materials comprised of cyclic dipeptide building blocks have excellent prospects for biotechnology applications due to their exceptional structural rigidity, morphological flexibility, ease of preparation and modification. Although the pharmacological uses of many natural cyclic dipeptides have been studied in detail, relatively little is reported on the engineering of these supramolecular architectures for the fabrication of functional materials. In this review, we discuss the progress in the design, synthesis, and characterization of cyclic dipeptide supramolecular nanomaterials over the past few decades, highlighting applications in biotechnology and optoelectronics engineering.

Spectroscopic characterization of water soluble phosphonato corrole: The effect of H-bounds on the self-assembled species

2016 ◽  
Vol 20 (08n11) ◽  
pp. 1272-1276 ◽  
Author(s):  
Rosalba Randazzo ◽  
Andrea Savoldelli ◽  
D. Andrea Cristaldi ◽  
Alessandra Cunsolo ◽  
Massimiliano Gaeta ◽  
...  
Keyword(s):  
Self Assembly ◽  
Hierarchical Control ◽  
Functional Materials ◽  
Spectroscopic Characterization ◽  
Research Field ◽  
Water Soluble ◽  
Self Assembling ◽  
Hierarchical Aggregation ◽  
Porphyrin Derivatives

Hierarchical self-assembly of porphyrins is an intrigue research field, which can lead to the design of functional materials. Porphyrin derivatives self-assembling under hierarchical control allows to understand the principles governing molecular recognition processes, as demonstrated for meso-tetrakis(4-phosphonatophenyl)porphyne (H2TPPP) whose polyprotic nature is responsible for a pH-dependent hierarchical aggregation. Herein, self-assembly of meso-tris(4-phosphonatophenyl)corrole (TPPC) in aqueous solution has been spectroscopically studied and compared to that of TPPP. The corrole aggregation does not follow the hierarchical rules that govern the porphyrin counterpart due to the accessibility of the core of the macrocycle to protons, promoted by the reduced number of involved intermolecular H-bonds.

scholarly journals Molecular Interactions between Asphaltene and Surfactants in a Hydrocarbon Solvent: Application to Asphaltene Dispersion

Symmetry ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 1767 ◽  
Author(s):  
Mohammadali Ahmadi ◽  
Zhangxin Chen
Keyword(s):  
Oil Recovery ◽  
Oil Sands ◽  
Md Simulation ◽  
Anionic Surfactants ◽  
Deep Understanding ◽  
Water Steam ◽  
Symmetrical Molecule ◽  
Different Types ◽  
Enhance Oil Recovery ◽  
Aggregation Tendency

Heavy oil and bitumen supply the vast majority of energy resources in Canada. Different methods can be implemented to produce oil from such unconventional resources. Surfactants are employed as an additive to water/steam to improve an injected fluid’s effectiveness and enhance oil recovery. One of the main fractions in bitumen is asphaltene, which is a non-symmetrical molecule. Studies of interactions between surfactants, anionic, and non-anionic, and asphaltene have been very limited in the literature. In this paper, we employed molecular dynamics (MD) simulation to theoretically focus on the interactions between surfactant molecules and different types of asphaltene molecules observed in real oil sands. Both non-anionic and anionic surfactants showed promising results in terms of dispersant efficiency; however, their performance depends on the asphaltene architecture. Moreover, a hydrogen/carbon (H/C) ratio of asphaltenes plays an inevitable role in asphaltene aggregation behavior. A higher H/C ratio resulted in decreasing asphaltene aggregation tendency. The results of these studies will give a deep understanding of the interactions between asphaltene and surfactant molecules.

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