Forming method of surface of synthesised nanoparticles

FIELD: nanotechnology.

SUBSTANCE: invention relates to nanotechnology and can be used for effective change of physicochemical properties of formed on nanoparticles surface inorganic nature of ligand envelope. For receiving of nanoparticles solution with ligand envelope into solution of metal salt in water or organic vehicle is successively introduced stabiliser solution, consisting ligands, and solution of reducer. After it is changed charge sign of ligand envelope by means of one-sided diffusion of substance molecules, changing charge sign of ligand envelope through the semipermeable membrane, into solution of nanoparticles. Additionally it is used membrane, allowing pores size less than size of nanoparticles, but more than size of substance molecules, changing charge sign of ligand envelope. In the capacity of stabiliser it is used substance, molecules' size of which less than size of semipermeable membrane pores.

EFFECT: it is provided receiving of nanoparticles with ligand envelope with specified properties.

2 cl, 2 ex

 

The invention relates to the field of nanotechnology and can be used for effective changes in the physico-chemical properties formed on the surface of nanoparticles of inorganic nature of the ligand shell.

The prior art method of forming the surface of the synthesized nanoparticles, comprising synthesizing nanoparticles by successive introduction into the solution of metal salt in water or an organic solvent solution of the stabilizer and the solution of reducing agent (WO 2006025627 A1, B62B 3/00, 2006). However, in some cases it is not possible to obtain the required properties formed on the surface of the nanoparticle ligand shell directly with the introduction of the stabilizer.

The invention is aimed at creating an efficient method of forming the surface of the synthesized nanoparticles of an inorganic nature (metal or poluprovodnikov) with desired functional properties formed on the surface of the nanoparticle ligand shell.

The solution of this problem is provided by the fact that in the method of forming the surface of the synthesized nanoparticles, comprising synthesizing nanoparticles by successive introduction into the solution of metal salt in water or an organic solvent solution of the stabilizer and the solution of reducing agent according to the invention is raissadat functionalization formed in the process of synthesizing ligand shell by one-way diffusion of molecules in solution functionalizing substances in the resulting solution of the nanoparticles through a semi-permeable partition - the membrane that separates the solution functionalizing substances from a solution of the nanoparticles, the pore size which is smaller than the size of the nanoparticles, but larger molecules functionalizing substances that form - functionalitywith ligand shell.

In addition, the stabilizer is used as the substance, the size of the molecules smaller than the pore size of the semi - permeable walls of the membrane.

Declared functionalization formed in the process of synthesizing ligand shell by one-way diffusion of molecules in solution functionalizing substances in the resulting solution of the nanoparticles through a semipermeable wall membrane, separating the solution functionalizing substances from a solution of the nanoparticles, ensures the formation on the surface of the nanoparticle ligand shell of molecules functionalizing substances with desired functional properties, concentration equal to the concentration in the original solution functionalizing substances, thus there is significant thinning of undesirable impurities. In addition, when the stabilizer substances, the size of the molecules is less than the pore size of the semi - permeable walls of the membrane, it is possible to replacement educated ligand shell of the stabilizer on the ligand shell of functionalizing is his substance.

The claimed method of forming the surface of the synthesized nanoparticles is carried out as follows.

Example 1.

At the first stage produce silver nanoparticles stabilized 11-mercaptoundecanoic acid. For this purpose, 100 ml of 1.34·10-3M silver nitrate solution injected 10 ml 5,56·10-6M 11-mercaptoundecanoic acid, linear defines the size of the molecules which ~1,3÷1,4 nm, and thoroughly shaken. Then to the solution with vigorous stirring on a magnetic stirrer is added in portions of 30 µl with an interval of 3 minutes 120 μl of 0.1 M solution of reducing agent is sodium borohydride. After adding the first portion of the solution of sodium borohydride almost immediately, the suspension becomes a bright yellow color, the intensity of which increased with the addition of new portions of the reducing agent. The color of the resulting suspension was intensively bright yellow with no signs of sedimentation. The synthesized silver nanoparticles in an electric field moving towards the positively charged electrode, which speaks to their negative charge arising from carboxyl groups mercaptoundecanoic acid.

In the second stage are diffusion funcionalities substance - lysine, which determines the size of the molecules which ~0,7÷0,9 nm, a suspension of nanoparticles through a semipermeable membrane, which determines the size of the diameter of pores is by toroi ~1,5÷2,0 nm. To this 5 ml of the particle suspension is placed in a cell, separated by a semi-permeable membrane from 1 l of 0.02 M solution of lysine. At the end of the diffusion process (after 2 days) when applying the electric field silver nanoparticles begin to move towards the negatively charged electrode, which confirms the change of the sign of the charge on the positive and replaced on the surface of the nanoparticles initial stabilizing substances ligand shell 11-mercaptoundecanoic acid molecules funcionalities substance - lysine.

Example 2.

In the first stage, prepare silver nanoparticles stabilized by polyvinyl alcohol. For this purpose, 100 ml of 1.34·10-3M silver nitrate solution injected 10 ml of 1% solution of polyvinyl alcohol, which determines the size of the molecules of which ~10÷15 nm, and thoroughly shaken. Then to the solution with vigorous stirring on a magnetic stirrer is added in portions of 30 µl with an interval of 3 minutes 120 μl of 0.1 M solution of reducing agent is sodium borohydride. After adding the first portion of the solution of sodium borohydride almost immediately the suspension becomes orange-yellow color, the intensity of which increases with the addition of new portions of the reducing agent. The color of the resulting suspension was intensively orange-yellow without visible signs of sedimentation. The synthesized nanoparticles sulfur is RA in the electric field unchanged since polyvinyl alcohol is weakly dissociating substance.

In the second stage are diffusion funcionalities substance - lysine, which determines the size of the molecules which ~0,7÷0,9 nm, a suspension of nanoparticles through a semipermeable membrane, which determines the pore size of which is ~1,5÷2,0 nm. To this 5 ml of the particle suspension is placed in a cell, separated by a semi-permeable membrane from 1 l of 0.02 M solution of lysine. At the end of the diffusion process (after 2 days) when applying the electric field silver nanoparticles begin to move towards the negatively charged electrode, indicating that the substitution on the surface of the nanoparticles initial stabilizing weakly dissociating substances polyvinyl alcohol on positively charged molecules funcionalities substance - lysine. When this occurs, the dilution of polyvinyl alcohol, the molecules of which remain in the solution - suspension of nanoparticles in a cell.

1. The method of forming the surface of the nanoparticles during synthesis, comprising the sequential introduction into the solution of metal salt in water or an organic solvent solution of the stabilizer-containing ligands, and the solution of reducing agent and obtaining a solution of nanoparticles with a ligand shell, characterized in that after receiving the nanoparticles with a ligand shell change the sign of the charge is handey shell by one-way diffusion of the molecules of the substance, changing the sign of the charge of the ligand shell through a semipermeable membrane into a solution of nanoparticles, using a membrane having a pore size smaller than the size of the nanoparticles, but more the size of the molecules of a substance that changes the sign of the charge of the ligand shell.

2. The method according to claim 1, characterized in that the stabilizer is used as the substance, the size of the molecules smaller than the pore size of the semi-permeable membrane.



 

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