scholarly journals Integration of surface science, nanoscience, and catalysis

2010 ◽  
Vol 83 (1) ◽  
pp. 243-252 ◽  
Author(s):  
Cun Wen ◽  
Yi Liu ◽  
Franklin Tao
Keyword(s):  
Heterogeneous Catalysis ◽  
Single Crystal ◽  
Surface Science ◽  
Active Sites ◽  
Liquid Interfaces ◽  
Design Studies ◽  
The Past ◽  
Catalytic Active Sites ◽  
Catalytic Mechanisms ◽  
Solid Liquid

This article briefly reviews the development of surface science and its close relevance to nanoscience and heterogeneous catalysis. The focus of this article is to highlight the importance of nanoscale surface science for understanding heterogeneous catalysis performing at solid–gas and solid–liquid interfaces. Surface science has built a foundation for the understanding of catalysis based on the studies of well-defined single-crystal catalysts in the past several decades. Studies of catalysis on well-defined nanoparticles (NPs) significantly promoted the understanding of catalytic mechanisms to an unprecedented level in the last decade. To understand reactions performed on catalytic active sites at nano or atomic scales and thus reach the goal of catalysis by design, studies of the surface of nanocatalysts are crucial. The challenges in such studies are discussed.

The electronic structure and geometric structure of nanoclusters as catalytic active sites

2013 ◽  
Vol 2 (5) ◽  
pp. 515-528 ◽  
Author(s):  
Hao Li ◽  
Linsen Li ◽  
Yadong Li
Keyword(s):  
Electronic Structure ◽  
Heterogeneous Catalysis ◽  
Metal Nanoparticles ◽  
Research Methods ◽  
Geometric Structure ◽  
Active Sites ◽  
Catalytic Effect ◽  
The Past ◽  
Catalytic Active Sites ◽  
Made In

AbstractIn the past few decades, metal nanoparticles applied in heterogeneous catalysis have attracted extensive attention. The term nanocatalysis is broadly referred to as the unique catalytic effect of this series of materials. Although considerable progress has been made in nanocatalysis, it still remains a great challenge to fully understand the nature of active sites in the nanoscale. Many concepts and models have been put forwarded to describe the properties and performances of nano- and subnanoparticles in catalysis. In this review, we propose our perspective on the active sites of heterogeneous catalysis from the aspects of electronic structure and geometric structure of nanoclusters and consider briefly how these clusters function in catalysis. The challenge in nanocatalysis research methods is also discussed.

Optimization of catalytic active sites in non-collinear antiferromagnetic Mn3Pt bulk single-crystal

2019 ◽  
Vol 10 ◽  
pp. 100137 ◽  
Author(s):  
G. Li ◽  
Q. Yang ◽  
K. Manna ◽  
C. Fu ◽  
H. Deniz ◽  
...  
Keyword(s):  
Single Crystal ◽  
Active Sites ◽  
Bulk Single Crystal ◽  
Catalytic Active Sites

Optimization of Catalytic Active Sites in Noncollinear Antiferromagnetic Mn₃Pt Bulk Single-Crystal

2019 ◽  
Author(s):  
Guowei LI ◽  
Qun Yang ◽  
Kaustuv Manna ◽  
Chenguang Fu ◽  
Hakan Deniz ◽  
...  
Keyword(s):  
Single Crystal ◽  
Active Sites ◽  
Bulk Single Crystal ◽  
Catalytic Active Sites

Low-background neutron reflectometry from solid/liquid interfaces

2022 ◽  
Vol 55 (1) ◽  
Author(s):  
David P. Hoogerheide ◽  
Joseph A. Dura ◽  
Brian B. Maranville ◽  
Charles F. Majkrzak
Keyword(s):  
Single Crystal ◽  
Single Crystal Silicon ◽  
Neutron Reflectometry ◽  
Liquid Interfaces ◽  
Crystal Silicon ◽  
Order Of Magnitude ◽  
Cell Sample ◽  
Liquid Cell ◽  
Path Lengths ◽  
Solid Liquid

Liquid cells are an increasingly common sample environment for neutron reflectometry experiments and are critical for measuring the properties of materials at solid/liquid interfaces. Background scattering determines the maximum useful scattering vector, and hence the spatial resolution, of the neutron reflectometry measurement. The primary sources of background are the liquid in the cell reservoir and the materials forming the liquid cell itself. Thus, characterization and mitigation of these background sources are necessary for improvements in the signal-to-background ratio and resolution of neutron reflectometry measurements employing liquid cells. Single-crystal silicon is a common material used for liquid cells due to its low incoherent scattering cross section for neutrons, and the path lengths of the neutron beam through silicon can be several centimetres in modern cell designs. Here, a liquid cell is constructed with a sub-50 µm thick liquid reservoir encased in single-crystal silicon. It is shown that, at high scattering vectors, inelastic scattering from silicon represents a significant portion of the scattering background and is, moreover, structured, confounding efforts to correct for it by established background subtraction techniques. A significant improvement in the measurement quality is achieved using energy-analyzed detection. Energy-analyzed detection reduces the scattering background from silicon by nearly an order of magnitude, and from fluids such as air and liquids by smaller but significant factors. Combining thin liquid reservoirs with energy-analyzed detection and the high flux of the CANDOR polychromatic reflectometer at the NIST Center for Neutron Research, a background-subtracted neutron reflectivity smaller than 10−8 from a liquid cell sample is reported.

Quantitative surface damage studies by H.R.E.M.

1989 ◽  
Vol 47 ◽  
pp. 632-633
Author(s):  
S. R. Singh ◽  
H. J. Fan ◽  
L. D. Marks
Keyword(s):  
Solar Wind ◽  
Quantitative Analysis ◽  
Surface Science ◽  
Surface Damage ◽  
Space Environment ◽  
Oxygen Desorption ◽  
The Past ◽  
Diffusion Controlled ◽  
Original Observation ◽  
Substantial Interest

Since the original observation that the surfaces of materials undergo radiation damage in the electron microscope similar to that observed by more conventional surface science techniques there has been substantial interest in understanding these phenomena in more detail; for a review see. For instance, surface damage in a microscope mimics damage in the space environment due to the solar wind and electron beam lithographic operations.However, purely qualitative experiments that have been done in the past are inadequate. In addition, many experiments performed in conventional microscopes may be inaccurate. What is needed is careful quantitative analysis including comparisons of the behavior in UHV versus that in a conventional microscope. In this paper we will present results of quantitative analysis which clearly demonstrate that the phenomena of importance are diffusion controlled; more detailed presentations of the data have been published elsewhere.As an illustration of the results, Figure 1 shows a plot of the shrinkage of a single, roughly spherical particle of WO3 versus time (dose) driven by oxygen desorption from the surface.

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