Molecular Interactions at Interfaces

Gupta, Raj K.; Manjuladevi, V.

doi:10.5772/35628

Cited by 2 publications

(5 citation statements)

References 49 publications

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“…Upon reduction of the area, the isotherm can show multiple steep transitions as the molecules exert more force on each other, which is accompanied by an increase in positional and orientational order . The extrapolation of a specific region of the isotherm to the zero surface pressure on the A m axis provides a straightforward way to estimate the area occupied by each molecule in the given phase …”

Section: Introductionmentioning

confidence: 99%

“…The reflected light intensity provides information about the thickness of the film, the surface density of the molecules, and the film morphology on the mesoscopic scale. Moreover, in some cases the optical anisotropy can be used to determine the collective tilt of the molecules. , The orientation of the molecules on the water surface can be further studied with vibrational spectroscopies including sum-frequency generation spectroscopy (SFG) and a range of infrared-based techniques. ,, These techniques, however, have a limited use for metal NPs, since the contribution of organic groups covering the spherical core is weak.…”

Section: Introductionmentioning

confidence: 99%

“…This means that in the case of smaller NPs, the contribution of attractive dispersion forces decreases primarily due to weaker vdW forces but second due to decreased contacts resulting from higher polydispersity. Gupta and Manjuladevi explore various examples of LB films based on nonamphiphilic molecules and suggest that, in the absence of enthalpic interactions in the form of hydrogen bonds between molecules of study and the water subphase, entropic factors may contribute to the layer stability …”

Section: Introductionmentioning

confidence: 99%

“… 2 The extrapolation of a specific region of the isotherm to the zero surface pressure on the A m axis provides a straightforward way to estimate the area occupied by each molecule in the given phase. 15 …”

Section: Introductionmentioning

confidence: 99%

“…Gupta and Manjuladevi explore various examples of LB films based on nonamphiphilic molecules and suggest that, in the absence of enthalpic interactions in the form of hydrogen bonds between molecules of study and the water subphase, entropic factors may contribute to the layer stability. 15 …”

Section: Introductionmentioning

confidence: 99%

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Langmuir and Langmuir–Blodgett Films of Gold and Silver Nanoparticles

Swierczewski

Bürgi

2023

Langmuir

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Recently the focus of the Langmuir–Blodgett technique as a method of choice to transfer monolayers from the air/water interface onto solid substrates in a controllable fashion has been shifting toward purely hydrophobic gold and silver nanoparticles. The fundamental interactions between particles that become relevant in the absence of polar groups range from dispersive attractions from the metal cores and repulsions between ligand shells to weaker entropic factors. The layer evolution is explored, starting with interfacial self-assembly upon solution spreading and domain and circular island formation, which subsequently merge into a complete monolayer and finally form multilayers or macroscopic wrinkles. Moreover, structural properties such as the core:ligand size ratio are investigated in the context of dispersive forces, whereby the nanoparticles with small cores and long ligands tend not to aggregate sufficiently to produce continuous films, those with large cores and short ligands were found to aggregate irreversibly, and those in between the two extremes were concluded to be able to form highly organized crystalline films. Similarly, the characteristics of the spreading solution such as the concentration and the solvent type crucially influence the film crystallinity, with the deciding factor being the degree of affinity between the capping ligand and the solvent used for spreading. Finally, the most common strategies employed to enhance the mechanical stability of the metal nanoparticle films along with the recent attempts to functionalize the particles in attempts to improve their applicability in the industry are summarized and evaluated in relation to their future prospects. One of the objectives of this feature article is to elucidate the differences between hydrophobic metal nanoparticles and typical amphiphilic molecules that the majority of the literature in the field describes and to familiarize the reader with the knowledge required to design Langmuir–Blodgett nanoparticle systems as well as the strategies to improve existing ones.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Langmuir and Langmuir–Blodgett Films of Gold and Silver Nanoparticles

Swierczewski

Bürgi

2023

Langmuir

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Biopolymer Thin Films Synthesized by Advanced Pulsed Laser Techniques

Axente¹,

Sima²,

Ristoscu³

et al. 2016

Recent Advances in Biopolymers

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This chapter provides an overview of recent advances in the field of laser-based synthesis of biopolymer thin films for biomedical applications. The introduction addresses the importance of biopolymer thin films with respect to several applications like tissue engineering, cell instructive environments, and drug delivery systems. The next section is devoted to applications of the fabrication of organic and hybrid organic-inorganic coatings. Matrix-assisted pulsed laser evaporation (MAPLE) and Combinatorial-MAPLE are introduced and compared with other conventional methods of thin films assembling on solid substrates. Advantages and limitations of the methods are pointed out by focusing on the delicate transfer of bio-macromolecules, preservation of properties and on the prospect of combinatorial libraries' synthesis in a single-step process. The following section provides a brief description of fundamental processes involved in the molecular transfer of delicate materials by MAPLE. Then, the chapter focuses on the laser synthesis of two polysaccharide thin films, namely Dextran doped with iron oxide nanoparticles and Levan, followed by an overview on the MAPLE synthesis of other biopolymers. The chapter ends with summary and perspectives of this fast-expanding research field, and a rich bibliographic database.

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Molecular Interactions at Interfaces

Cited by 2 publications

References 49 publications

Langmuir and Langmuir–Blodgett Films of Gold and Silver Nanoparticles

Langmuir and Langmuir–Blodgett Films of Gold and Silver Nanoparticles

Biopolymer Thin Films Synthesized by Advanced Pulsed Laser Techniques

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