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Impact of surface chemistry, YONG HUI SYEN A18SC0353 - Coggle Diagram
Impact of surface chemistry
Heterogeneous Catalyst Technology
Heterogenous catalyst
Increase production of a specific product
High reactivity of surface atoms
reactions on the surface of solid catalysts
-adsorption
-surface diffusion and reaction of adsorbed species
-desorption
Application
Synthesis of bulk chemicals
Synthesis of methanol, ethylene glycol antifreeze, synthetic rubber, plastic
Petroleum industry
naphtha refining process, production of high quality fuels and bulk chemicals
Pollution control and prevention
eliminate generation of hazardous substances in chemical conversion processes
Research and development
fuels production by photocatalysts
electrochemical fuel cells
conversion of biomass to fuels and chemicals
production of fine chemicals and pharmaceutical compounds
Definition of surface and interface
boundary between a material and its surrounding environment
influence interactions with the environment
Semiconductor-Based Technology.
transistor and integrated circuit
-amplify an electronic signal
-etched out of a small semiconductor surface
Application
manufacture of silicon-based integrated circuits possible
compound semiconductors
Optoelectronics applications
higher electron mobility and electron velocity
Production of thin AlN buffer layer on substrate
-promote lateral growth of the GaN film
Medical Technology.
nonspecific protein adsorption
producing antifouling coatings and immobilization of biological recognition elements
glucose biosensor
enzyme layer of glucose oxidase immobilized on an oxygen electrode selectively
catalyzes the oxidation of glucose in a blood sample
Anticorrosion Technology.
coating of material with a protective layer
kinetic barrier to slow down corrosion process
Lubricant Technology.
material confined between two hard surfaces
reduce the friction at the interfaces
Solid lubricants
used in high-temperature gas turbines and space applications
more environmentally friendly than fluid-based lubricants
ultra-thin lubricant films
prevent wear of computer hard disk surface by disk head
Molecular level
in situ characterization of a variety of surface properties
thermal and chemisorptions-activated surface reconstructions
surface chemical bonds were obtained by spectroscopic techniques
Ambient Pressure X-Ray Photoelectron Spectroscopy
refocuses the photoelectrons from the sample surface into standard electron energy analyzer in high-vacuum.
studying the oxidation states of Rh nanoparticles
surface oxide on the Rh nanparticles increases with size reduction
High Pressure Scanning Tunneling Microscopy (HP-STM).
monitor the structure of surfaces and adsorbates on the molecular level
study adsorbate mobility
catalyst surfaces saturated by various hydrocarbon adsorbates under high pressures
studies on catalyst surfaces
CO chemisorption-induced reconstruction of stepped Pt surfaces
stepped Pt surfaces can undergo extensive and reversible restructuring when exposed to carbon monoxide (CO) at pressures >0.1 torr
Sum-Frequency Generation (SFG) Vibrational Spectroscopy.
two high-energy pulsed laser beams are overlapped spacially and temporally on an interface of interest.
detect surface intermediates of catalytic reactions over single crystal and nanoparticle model catalysts at high pressures
determine the major reaction intermediates on the catalyst surfaces
understand the competition between intermediates for active sites
YONG HUI SYEN
A18SC0353
