Method for production of inorganic nanofibres through electrostatic spinning

Abstract

The present disclosure relates to the production method of inorganic nanofibres through electrostatic spinning of solution, which comprises alkoxide of metal or of semi-metal or of non-metal dissolved in a solvent system on basis of alcohol. The solution is stabilised by chelating agent, which prevents hydrolysis of alkoxide, and after homogenisation it is mixed with solution of poly(vinylpyrrolidone) in alcohol, after then the resultant solution is brought into electrostatic field, in which the electrostatic spinning is running continually, the result of which is production of organic-inorganic nanofibres, which are after then calcinated outside the spinning device in the air atmosphere at the temperature from 500° C. to 1300° C.

1 . A method for production of inorganic nanofibres through electrostatic spinning of solution, which comprises alkoxide of metal or of semi-metal or of non-metal dissolved in a solvent system on basis of alcohol, wherein the solution is stabilised by acethylacetone, which prevents hydrolysis of alkoxide, and after homogenisation it is mixed with solution of poly(vinylpyrrolidone) in an alcohol, after then the resultant solution is brought into electrostatic field, in which the electrostatic spinning is running continually, the result of which is production of organic-inorganic nanofibres, which are after then calcinated outside the spinning device in air atmosphere at the temperature from 500 ° C. to 1300° C. 
     
     
         2 . The method according to  claim 1 , wherein, to increase the electrical conductivity of the solution, a concentrated acid is added into the solution. 
     
     
         3 . The method according to  claim 2 , the wherein the acid is selected from the group of hydrochloric acid, nitric acid, phosphoric acid. 
     
     
         4 . (canceled) 
     
     
         5 . The method according to  claim 1 , wherein the alcohol in solution of poly(vinylpyrrolidone) is selected from the group of ethanol, 1-propanol, 2-propanol or their mixtures. 
     
     
         6 . The method according to  claim 1 , wherein the poly(vinylpyrrolidone) has an average molecular weight within the range of 1000000-1500000 g/mol and its weight concentration in the solution is within the range from 4 to 9%. 
     
     
         7 . The method according to  claim 6 , wherein the poly(vinylpyrrolidone) has average molecular weight of 1300000 g/mol. 
     
     
         8 . The method according to  claim 1 , wherein the poly(vinylpyrrolidone) has viscosity number K within the range from K-70 to K-95 and its concentration in solution is in the range from 4 to 9%. 
     
     
         9 . The method according to  claim 8 , wherein the poly(vinylpyrrolidone) has viscosity number K-90. 
     
     
         10 . The method according to  claim 1 , wherein the alkoxide of metal is selected from the group of titanium tetrabutoxide, titanium tetraisopropoxide, aluminium tri-sec-butoxide, aluminium triisopropoxide, zirconium tetraisopropoxide. 
     
     
         11 . The method according to  claim 1 , wherein the alkoxide of semi-metal is selected from the group of tetraethoxysilane, borium triethoxide. 
     
     
         12 . The method according to  claim 1 , wherein the molecular ratio of alkoxide and chelating agent in solution is from 1:0.8 to 1:2.2. 
     
     
         13 . The method according to  claim 1 , wherein the alkoxide solution in electrostatic field for spinning is to be found on surface of active spinning zone of the spinning mean of the spinning electrode. 
     
     
         14 . The method according to  claim 12 , wherein the solution of alkoxide is transported into electrostatic field for spinning by surface of the spinning electrode. 
     
     
         15 . The method according to  claim 12 , wherein the spinning electrode is formed of rotating spinning electrode of an oblong shape, which extends by a section of its circumference into the spinning solution.