Nanoscale force induced size-selective separation and self-assembly of metal nanoparticles: sharp colloidal stability thresholds and hcp ordering

Coinage-metal nanoparticles are key components of many printable electronic inks. They can be combined with polymers to form conductive composites and have been used as the basis of molecular electronic devices. This review summarizes the multidimensional role of surface ligands that cover their metal cores. Ligands not only passivate crystal facets and determine growth rates and shapes; they also affect size and colloidal stability. Particle shapes can be tuned via the ligand choice while ligand length, size, ω-functionalities, and chemical nature influence shelf-life and stability of nanoparticles in dispersions. When particles are deposited, ligands affect the electrical properties of the resulting film, the morphology of particle films, and the nature of the interfaces. The effects of the ligands on sintering, cross-linking, and self-assembly of particles in electronic materials are discussed.

Download Full-text

Photoacoustics for listening to Metal Nanoparticles Super-Aggregates

Nanoscale Advances ◽

10.1039/d1na00333j ◽

2021 ◽

Author(s):

Roberto Li Voti ◽

Grigore Leahu ◽

Concita Sibilia ◽

Roberto Matassa ◽

Giuseppe Familiari ◽

...

Keyword(s):

Metal Nanoparticles ◽

Size Distribution ◽

Packing Density ◽

Self Assembly ◽

Détection Signal ◽

Photoacoustic Detection ◽

New Strategy ◽

Aggregate Packing ◽

Detection Signal

Photoacoustic detection signal has been used to build a new strategy to determine the mesoscale self-assembly of metal nanoparticles in terms of size distribution and aggregate packing density (metal nanoparticles...

Download Full-text

Self-assembly of transition metal nanoparticles using marine sources**The authors declare that there is no conflict of interests regarding the publication of this chapter.

Fabrication and Self-Assembly of Nanobiomaterials ◽

10.1016/b978-0-323-41533-0.00015-5 ◽

2016 ◽

pp. 459-483 ◽

Cited By ~ 3

Author(s):

Selvaraj Mohana Roopan ◽

Ganesh Elango

Keyword(s):

Transition Metal ◽

Metal Nanoparticles ◽

Self Assembly ◽

Transition Metal Nanoparticles ◽

Conflict Of Interests

Download Full-text

Insight into the Self-Assembly of Water-Soluble Perylene Bisimide Derivatives Through a Combined Computational and Experimental Approach

10.26434/chemrxiv.8006564.v1 ◽

2019 ◽

Author(s):

Emily R. Draper ◽

Liam Wilbraham ◽

Dave J. Adams ◽

Matthew Wallace ◽

Martijn Zwijnenburg

Keyword(s):

Density Functional Theory ◽

Self Assembly ◽

Density Functional ◽

Colloidal Stability ◽

Water Soluble ◽

The Self ◽

Functional Theory ◽

Perylene Bisimide ◽

Aggregate Growth ◽

Perylene Bisimides

We use a combination of computational and experimental techniques to study the self-assembly and gelation of water-soluble perylene bisimides derivatised at the imide position with an amino acid. Specifically, we study the likely structure of self-assembled aggregates of the alanine-functionalised perylene bisimide (PBI-A) and the thermodynamics of their formation using density functional theory and predict the UV-vis spectra of such aggregates using time-dependent density functional theory. We compare these predictions to experiments in which we study the evolution of the UV-Vis and NMR spectra and rheology of alkaline PBI-A solutions when gradually decreasing the pH. Based on the combined computational and experimental results, we show that PBI-A self-assembles at all pH values but that aggregates grow in size upon protonation. Gelation is driven not by aggregate growth but reduction of the aggregation surface-charge and a decrease in the colloidal stability of the aggregation with respect to agglomeration.

Download Full-text