Composite luminescent film containing rare earth polyacid and brucite and preparation method thereof
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A technology of luminescent film and rare earth polyacid, which is applied in the field of composite luminescent film containing rare earth polyacid and hydrotalcite and its preparation, to achieve the effect of strong operability, directional arrangement and uniform dispersion, and simple preparation process
Active Publication Date: 2010-12-01
BEIJING UNIV OF CHEM TECH
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At present, according to the positive charge of hydrotalcite itself, it can be assembled with anion through the action of charge. The assembly object involves some inorganic and organic small molecules, and the layer-by-layer film assembly of hydrotalcite and polyacid inorganic polymers has not yet been done. to report
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Embodiment 1
[0022] 1. Preparation of hydrotalcite precursor with nitrate between layers by ion exchange method:
[0023] a, 0.02mol of solid Mg(NO 3 ) 2 ·6H 2 O and 0.01mol of solid Al(NO 3 ) 3 ·6H 2 O and 0.026mol hexamethylenetetramine were dissolved in 70ml of deionized water, crystallized at 140°C for 24 hours in a 90ml PTFE pressure reactor, washed with deionized water, and dried at 70°C for 12h , to obtain carbonate intercalation hydrotalcite;
[0024] b. Dissolve 0.3g of the above-mentioned carbonate hydrotalcite and 63.75g of solid sodium nitrate in 300ml to remove CO 2 After uniform dispersion in deionized water, add 0.07ml of concentrated nitric acid, stir at 25°C under nitrogen atmosphere, carry out ion exchange reaction for 12 hours, and then use 2 Wash with deionized water until neutral, and dry at 70°C for 18 hours to obtain a hydrotalcite precursor with nitrate between layers.
[0025] 2. Take 0.1 g of the hydrotalcite precursor prepared in step 1 with nitrate betwe...
Embodiment 2
[0030] 1. Preparation of hydrotalcite precursor with nitrate between layers by ion exchange method:
[0031] a, 0.02mol of solid Mg(NO 3 ) 2 ·6H 2 O and 0.01mol of solid Al(NO 3 ) 3 ·6H 2 O and 0.026mol hexamethylenetetramine were dissolved in 70ml of deionized water, crystallized at 140°C for 24 hours in a 90ml polytetrafluoroethylene pressure reactor, washed with deionized water, and dried at 70°C for 12h , to obtain carbonate intercalation hydrotalcite;
[0032] b. Dissolve 0.3g of the above-mentioned carbonate hydrotalcite and 63.75g of solid sodium nitrate in 300ml to remove CO 2After uniform dispersion in deionized water, add 0.07ml of concentrated nitric acid, stir at 25°C under nitrogen atmosphere, carry out ion exchange reaction for 12 hours, and then use 2 Wash with deionized water until neutral, and dry at 70°C for 18 hours to obtain a hydrotalcite precursor with nitrate between layers.
[0033] 2. Take 0.1g of the above-mentioned nitrate intercalated hydrot...
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Abstract
The invention discloses a composite luminescent film containing rare earth polyacid and brucite and a preparation method thereof and belongs to the technical field of the preparation of inorganic composite luminescent films. The preparation method comprises the following steps of: preparing brucite colloidal solution stripped by using a formamide solvent; confecting rare earth polyacid-containingsolution; and performing a plurality of alternate assemblies in two types of solution by using a hydrophilically-treated substrate to obtain a composite multilayer luminescent film containing the rare earth polyacid and the brucite. In the preparation method, sequential assembly of rare earth polyacid-containing functional molecules and brucite nanosheets is realized for the first time, and the application field of a material containing the rare earth polyacid and the brucite is expanded. The thickness of the obtained film is accurately controllable in nanoscale. Simultaneously, the space limiting function of the brucite and coaction between a host and a guest are utilized, so that the immobilization of luminescent molecules containing the rare earth polyacid is realized, the controllableluminous intensity of the film is realized by changing assembly times, the thermal stability of the film is enhanced effectively, and fluorescent quenching caused by aggregation is reduced.
Description
technical field [0001] The invention belongs to the technical field of preparation of inorganic composite luminescent films, in particular to a composite luminescent film containing rare earth polyacid and hydrotalcite and a preparation method thereof. Background technique [0002] Polyacid compounds are a class of multimetal oxides containing V, Mo, W and other metals. Isopolyanions formed by the condensation of the same oxoacid ions are called isopolyacids. The condensation of different types of oxyacid anions is called heteropolyanion, and the acid is called heteropolyacid. At present, it is known that the atoms of nearly 70 kinds of elements can be used as heteroatoms in heteropolyacids, including all the first series transition elements, almost all the second and third series transition elements, plus B, Al, Ga, Si , Ge, Sn, P, As, Sb, Bi, Se, Te, I, etc. And each heteroatom can often exist in heteropolyanions in different valence states, so there are quite a variety...
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