Нанорозмірні Інтерфейси та Активність

Introduction

The study of nanomaterials involves understanding phenomena that are not typically observed in bulk materials due to their small size. These include surface effects, quantum confinement, and increased reaction rates.

Nanomaterials exhibit unique properties arising from their dimensions, often leading to enhanced catalytic activity, altered electronic behavior, and modified mechanical characteristics.

Surface Characterisation Techniques

Scanning Tunneling Microscopy (STM) and Atomic Force Microscopy (AFM) are used to determine the surface topography and measure forces acting on the sample.

X-ray Photoelectron Spectroscopy (XPS) and Ultraviolet Photoelectron Spectroscopy (UPS) are employed to investigate the electronic structure and chemical composition of the material’s surface.

Operando spectroscopic techniques, such as Raman spectroscopy and infrared reflection absorption spectroscopy (IRRAS), provide real-time information about the active sites within a material during a reaction or process.

Surface Reaction Kinetics

The surface reaction kinetics are determined by the adsorption energetics, which is calculated using DFT. The microkinetic model describes the elementary steps of the reactions occurring on the surface.

The activity is defined as the rate at which the reactants are converted into products. This value is used to determine the overall performance of the device.

Applications

Electrocatalysis and photocatalysis

Nanosensors and molecular recognition

Protective coatings and corrosion control

Examples

Example: CO Oxidation on Au Nanoparticles

Synthesize supported Au with controlled size.

Measure activity vs temperature; identify active size regime.

Correlate with support oxygen vacancies.

Часті запитання

Спробуйте наживо

Усе, що вище, працює прямо у вашому браузері — відкрийте Brownian Motion — Nanoparticle Diffusion Simulator і змінюйте параметри під час роботи. Нічого не встановлюється, нічого не завантажується на сервер, уся модель живе в одній вкладці.