Electron paramagnetic resonance (EPR) technique in the application of the material science and physics

Hindered amine light stabilizer (HALS) successfully suppress the polymer light oxidation.

The degradation of polymer due to light, will cause discolouration and mechanical properties of polymer (elasticity, toughness, etc.).In order to prevent the decomposition, hindered amine light stabilizers (HALS) can be added to the polymer.By monitoring the EPR signal light stabilizer, assess its effectiveness.

Using nitrogen oxygen free radical spin labeling of polyelectrolyte EPR study of multilayer membrane (PEM).

Polyelectrolyte multilayer (polymers) with dissociative ion groups by alternating adsorption polyelectrolyte with opposite charges, which formed also called technology step by step.By the strength of weak polyanion and polycation PEM membrane usually use nitrogen oxygen free radicals (4 - amino - TEMPO) to spin, the EPR spectrum method were studied.This research method can be used to detect the growth of PEM membrane, through quantitative analysis of EPR provide information on each of the double.

Coating of hindered amine light stabilizer (HALS) EPR signal hint coating metamorphism after ultraviolet irradiation.

Paint film degradation is the main reason for the degradation of several components, including adhesives, and some paint.This is long term exposure to ultraviolet radiation (light), moisture and caused by free radicals formed by the freezing and thawing cycle.High reactivity, free radicals can be formed in the material or decomposition of chemical bonds.Coating exposed to these conditions, the free radicals can damage film, undermining the durability of the coating.The process and the skin aging process is very similar.When skin containing free radicals have exposure to the sun, can appear the signs of ageing, including wrinkles, skin peeling, sunburn and skin drying as a whole.

Use EPR to detect faults of amorphous silicon.

In the photovoltaic industry, is used in the production of monocrystalline or polycrystalline silicon solar cell one of the most common material.Using the method of EPR, can the paramagnetic defect were detailed characterization, with a thorough understanding of caused by the degradation of paramagnetic centers on the efficiency of the solar cell active layer what effect.Of amorphous silicon photovoltaic device with EPR studies have shown that the presence of paramagnetic defect with the charge collection efficiency of this kind of material has a very strong connection.

Determination of wurtzite in the filmMgcoordination

Transition and the rare earths and actinides ions is 3 d, 4 d, 5 d, 4 and 5 f f family member, is also a large number of EPR research topic.Transition element of EPR study object, is its variable valence.Zn1xMgxO complex, for example, is a kind of oxide semiconductor multi-functional materials, the interface between ontology and arrangement of atoms determines the important features of the oxide.To this, you can use the EPR spectrum method heteroepitaxy wurtzite Zn1xMgxO: Mn Mg coordination in thin film.