Metal oxide macroscopic fiber and preparation method thereof

Abstract

A metal oxide macroscopic fiber and a preparation method thereof, the method including: adding, as a spinning dope, an anionic metal oxide aqueous colloidal solution into wet spinning equipment, extruding the spinning dope from the spinning equipment into a thread, injecting the extruded thread into a coagulating bath containing a flocculating agent to obtain as-spun fiber, and repeatedly washing the resulted as-spun fiber with deionized water and drying same, thereby obtaining a metal oxide fiber. Said method makes the process simple and controllable, being adaptable to production on a large scale. The prepared metal oxide fiber having special physical and chemical properties is widely applicable in terms of intelligent spinning, biomedicine, energy recycling and conversion, and the field of microelectronic devices and the like.

Claims

1. A method for preparing metal oxide macroscopic fiber, characterized in that it comprises the following steps: providing an anionic metal oxide colloidal aqueous solution; obtaining an as-spun fiber by wet spinning the anionic metal oxide colloidal aqueous solution in a coagulating bath; and washing the as-spun fiber with deionized water and drying the same, thereby obtaining the metal oxide macroscopic fiber; wherein said coagulation bath contains a flocculant with the mass fraction being between 0.5% to 5%, and speed of the wet spinning is between 0.1 ml/min to 5 ml/min; the anionic metal oxide colloidal aqueous solution consists of 0.1 mg/ml to 20 mg/ml of anionic metal oxide dispersed in water.

2. The method for preparing metal oxide macroscopic fiber of claim 1, wherein the anionic metal oxide is manganese oxide, ruthenium oxide, titanium oxide, niobium oxide, tantalum oxide, tungsten oxide, cesium tungsten oxide, calcium niobium oxide, titanium niobium oxide or a mixture thereof.

3. The method for preparing metal oxide macroscopic fiber of claim 2, wherein the manganese oxide is MnO.sub.2.sup.x, 0<x<1, or A.sub.2Na.sub.y3MnO.sub.3y+1.sup., in which A is Ca, Sr, Ba, 3y6, said tantalum oxide is TaO.sup.3, SrTa.sub.2O.sub.7.sup.2, La.sub.0.7Tb.sub.0.3Ta.sub.2O.sub.7.sup. or Eu.sub.0.56Ta.sub.2O.sub.7.sup.2, said tungsten oxide is W.sub.2O.sub.7.sup.2, said cesium tungsten oxide is Cs.sub.4W.sub.11O.sub.36.sup.2, said ruthenium oxide is RuO.sub.2.1.sup.z or RuO.sub.2.sup.z, 0<z<1, said niobium oxide is Nb.sub.6O.sub.17.sup.4, Nb.sub.3O.sub.8.sup., LaNb.sub.2O.sub.7.sup. or La.sub.0.9Eu.sub.0.05Nb.sub.2O.sub.7.sup., said titanium oxide is Ti.sub.1-nO.sub.2.sup.4n, 0<n<1, Ti.sub.0.8Co.sub.0.2O.sub.2.sup.0.4, Bi.sub.4Ti.sub.3O.sub.12.sup.2, Ti.sub.0.6Fe.sub.0.4O.sub.2.sup.0.4, Ti.sub.0.8m/4Fe.sub.m/2Co.sub.0.2m/4O.sub.2.sup.0.4, 0m0.8, Ti.sub.(5.22i)/6Mn.sub.i/2O.sub.2.sup.(3.21)/6, 0i0.4 or RE.sub.2Ti.sub.3O.sub.10.sup.2, in which RE is La, Pr, Sm, Nd, Eu, Gd, Tb or Dy, said calcium niobium oxide is Ca.sub.2Nb.sub.3O.sub.10.sup., said titanium niobium oxide is TiNbO.sub.5.sup., Ti.sub.2NbO.sub.7.sup. or Ti.sub.5NbO.sub.14.sup.3.

4. The method for preparing metal oxide macroscopic fiber of claim 3, wherein the anionic metal oxide is Ti.sub.0.87O.sub.2.sup.0.52, W.sub.2O.sub.7.sup.2, TiNb.sub.6O.sub.5.sup.5, Ca.sub.2Nb.sub.3O.sub.10.sup., TaO.sup.3, Nb.sub.6O.sub.17.sup.4, Nb.sub.3O.sub.8.sup., RuO.sub.2.1.sup.0.2, RuO.sub.2.sup.0.2, SrTa.sub.2O.sub.7.sup.2, LaNb.sub.2O.sub.7.sup., Cs.sub.4W.sub.11O.sub.36.sup.2 or a mixture thereof.

5. The method for preparing metal oxide macroscopic fiber of claim 1, wherein the coagulating bath comprises water, methanol, ethanol, acetone or a mixture thereof.

6. The method for preparing metal oxide macroscopic fiber of claim 1, wherein the flocculant is lanthanum salt, aluminum salt, ferric salt, copper salt, calcium salt, magnesium salt, zinc salt, sodium salt, Lithium salt, potassium salt, acetic acid, polyvinyl alcohol, polyethylene glycol, cellulose, chitosan, sodium dodecylsulphate, cetyl trimethyl ammonium bromide, concentrated sulfuric acid, or mixture thereof.

7. The method for preparing metal oxide macroscopic fiber of claim 6, wherein the flocculant is lanthanum chloride, aluminum chloride, ferric nitrate, copper sulphate, calcium chloride, magnesium sulphate, zinc chloride, sodium chloride, lithium fluoride, potassium sulphate, acetic acid, cellulose, polyethylene glycol, chitosan, sodium dodecylsulphate, cetyl trimethyl ammonium bromide, or a mixture thereof.

8. The method for preparing metal oxide macroscopic fiber of claim 1, wherein the as-spun fiber is washed by deionized water after drawing, and the draw ratio is between 2 to 8.

9. The method for preparing metal oxide macroscopic fiber of claim 1, wherein the as-spun fiber is washed by deionized water until the pH of washing waste water is 7, and the conditions for drying are drying for 0.5 h to 72.0 h between 15 C. to 80 C.

Description

DESCRIPTION OF DRAWINGS

(1) FIG. 1 is an optical photograph of titanium oxide macroscopic fibers prepared in Example.

(2) FIG. 2 is a photograph of a mechanical test of the titanium oxide macroscopic fibers in Example.

EXAMPLES FOR THE INVENTION

Detailed Description of the Embodiments

(3) The present invention will be further described below with reference to the accompanying drawings and embodiments:

Example 1

(4) Chemicals of TiO.sub.2, K.sub.2CO.sub.3, Li.sub.2CO.sub.3, and MoO.sub.3 were mixed in the mass ratio of 1.73:1.67:0.13:1.27 and heated at 1073 K for 0.5 h. After cooling to room temperature, the product was heated at 1473 K for 20 h, washed with deionized water and finally got K.sub.0.8 [Ti.sub.1.73Li.sub.0.27] O.sub.4 crystal. The H.sub.1.07Ti.sub.1.73O.sub.4 was obtained by filtering the reaction solution formed through the K.sub.0.8 [Ti.sub.1.73Li.sub.0.27] O.sub.4 crystal immersed in 0.5 mol/1 HCl solution for 48 h. The H.sub.1.07Ti.sub.1.73O.sub.4 was immersed in tetramethylammonium hydroxide solution, after shaking and reaction for 7 d, and after centrifugation, the solid washed with water to obtain Ti.sub.0.87O.sub.2.sup.0.52. Other metal oxides can be obtained by changing the raw materials.

Example 2

(5) The colloidal aqueous solution of Ti.sub.0.87O.sub.2.sup.0.52 with a mass fraction of 0.8 mg/ml was added into wet spinning equipment, and injected into the water solution of chitosan with the mass fraction was 0.6 wt %, which at the spinning speed of 0.5 ml/min, and as-spun fiber was obtained with tensile orientation of fiber at twice tensile speed. The as-spun fiber was washed 3 times with deionized water, until the waste liquid was neutral and dried at 25 C. for 24 hours to obtain a well-oriented titanium oxide fiber.

Example 3

(6) The colloidal aqueous solution of Ti.sub.0.87O.sub.2.sup.0.52 with a mass fraction of 0.8 mg/ml was added into wet spinning equipment, and injected into the water solution of chitosan with the mass fraction was 0.6%, which at the spinning speed of 1.5 ml/min, and as-spun fiber was obtained with tensile orientation of fiber at twice tensile speed. The as-spun fiber was washed 3 times with deionized water, and dried at 25 C. for 24 hours to obtain a well-oriented titanium oxide fiber.

Example 4

(7) The colloidal aqueous solution of Ti.sub.0.87O.sub.2.sup.0.52 with a mass fraction of 0.8 mg/ml was added into wet spinning equipment, and injected into the coagulation bath consist of water and chitosan of the mass fraction was 1.2%, which at the spinning speed of 1.5 ml/min, and as-spun fiber was obtained with tensile orientation of fiber at twice tensile speed. The as-spun fiber was washed 3 times with deionized water, and dried at 25 C. for 24 hours to obtain a well-oriented titanium oxide fiber.

Example 5

(8) The colloidal aqueous solution of Ti.sub.0.87O.sub.2.sup.0.52 with a mass fraction of 0.8 mg/ml was added into wet spinning equipment, and injected into the coagulation bath consist of water and chitosan of the mass fraction was 1.2%, which at the spinning speed of 1.5 ml/min, and as-spun fiber was obtained with tensile orientation of fiber at eight-fold tensile speed. The as-spun fiber was washed 3 times with deionized water, and dried at 25 C. for 24 hours to obtain a well-oriented titanium oxide fiber.

Example 6

(9) The colloidal aqueous solution of Ti.sub.0.87O.sub.2.sup.0.52 with a mass fraction of 0.8 mg/ml was added into wet spinning equipment, and injected into the coagulation bath consist of water and chitosan of the mass fraction was 1.2%, which at the spinning speed of 1.5 ml/min, and as-spun fiber was obtained with tensile orientation of fiber at eight-fold tensile speed. The as-spun fiber was washed 3 times with deionized water, and dried at 65 C. for 12 hours to obtain a well-oriented titanium oxide fiber.

Example 7

(10) The colloidal aqueous solution of Ti.sub.0.87O.sub.2.sup.0.52 with a mass fraction of 0.8 mg/ml was added into wet spinning equipment, and injected into the coagulation bath consist of water and chitosan of the mass fraction was 4.5%, which at the spinning speed of 1.5 ml/min, and as-spun fiber was obtained with tensile orientation of fiber at twice tensile speed. The as-spun fiber was washed 3 times with deionized water, and dried at 25 C. for 24 hours to obtain a well-oriented titanium oxide fiber.

Example 8

(11) The colloidal aqueous solution of Ti.sub.0.87O.sub.2.sup.0.52 with a mass fraction of 0.8 mg/ml was added into wet spinning equipment, and injected into the coagulation bath consist of water and chitosan of the mass fraction was 0.6%, which at the spinning speed of 4.5 ml/min, and as-spun fiber was obtained with tensile orientation of fiber at twice tensile speed. The as-spun fiber was washed 3 times with deionized water, and dried at 25 C. for 24 hours to obtain a well-oriented titanium oxide fiber.

Example 9

(12) The colloidal aqueous solution of Ti.sub.0.87O.sub.2.sup.0.52 with a mass fraction of 0.8 mg/ml was added into wet spinning equipment, and injected into the coagulation bath consist of water, ethanol and chitosan of the mass fraction was 1.2%, which at the spinning speed of 1.5 ml/min, and as-spun fiber was obtained with tensile orientation of fiber at twice tensile speed. The as-spun fiber was washed 3 times with deionized water, and dried at 25 C. for 24 hours to obtain a well-oriented titanium oxide fiber.

Example 10

(13) The colloidal aqueous solution of Ti.sub.0.87O.sub.2.sup.0.52 with a mass fraction of 0.8 mg/ml was added into wet spinning equipment, and injected into the coagulation bath consist of water, acetic acid of the mass fraction was 4% and chitosan of the mass fraction was 1.2%, which at the spinning speed of 1.5 ml/min, and as-spun fiber was obtained with tensile orientation of fiber at twice tensile speed. The as-spun fiber was washed 3 times with deionized water, and dried at 25 C. for 24 hours to obtain a well-oriented titanium oxide fiber.

Example 11

(14) The colloidal aqueous solution of Ti.sub.0.87O.sub.2.sup.0.52 with a mass fraction of 0.8 mg/ml was added into wet spinning equipment, and injected into the coagulation bath consist of ethanol and sodium chloride of the mass fraction was 4%, which at the spinning speed of 1.5 ml/min, and as-spun fiber was obtained with tensile orientation of fiber at quadruple tensile speed. The as-spun fiber was washed 3 times with deionized water, and dried at 25 C. for 24 hours to obtain a well-oriented titanium oxide fiber.

Example 12

(15) The colloidal aqueous solution of Ti.sub.0.87O.sub.2.sup.0.52 with a mass fraction of 0.8 mg/ml was added into wet spinning equipment, and injected into the coagulation bath consist of water and lanthanum chloride of the mass fraction was 1.3%, which at the spinning speed of 1.5 ml/min, and as-spun fiber was obtained with tensile orientation of fiber at quadruple tensile speed. The as-spun fiber was washed 3 times with deionized water, and dried at 25 C. for 24 hours to obtain a well-oriented titanium oxide fiber.

Example 13

(16) The colloidal aqueous solution of Ti.sub.0.87O.sub.2.sup.0.52 with a mass fraction of 0.8 mg/ml was added into wet spinning equipment, and injected into the coagulation bath consist of water and calcium chloride of the mass fraction was 2.5%, which at the spinning speed of 2.5 ml/min, and as-spun fiber was obtained with tensile orientation of fiber at quintuple tensile speed. The as-spun fiber was washed 3 times with deionized water, and dried at 25 C. for 24 hours to obtain a well-oriented titanium oxide fiber.

(17) FIG. 1 was an optical photograph of the titanium oxide macroscopic fiber, wherein a was the Example 2, b was the Example 7, c was the Example 9, d was the Example 13. It can be seen that length of macroscopic fiber sample prepared in the invention was about 15 cm and diameter was about 500 m. The fiber can be wrapped well, proving its good flexibility.

(18) FIG. 2 was a photograph of the mechanical test of the above titanium oxide macroscopic fiber, wherein a was the Example 2, b was the Example 7, c was the Example 9, d was the Example 13. It can be seen that the single fiber was able to bear standard weight of 20 g, and the tensile strength was 160 MPa, 150 MPa, 150 MPa, 165 MPa respectively. It was indicated that the metal oxide macroscopic fibers provided by the invention have excellent mechanical properties and were suitable for industrial applications of flexible devices. sodium dodecylsulphate, cetyl trimethyl ammonium bromide.

Example 14

(19) The colloidal aqueous solution of Ti.sub.0.87O.sub.2.sup.0.52 with a mass fraction of 0.8 mg/ml was added into wet spinning equipment, and injected into the coagulation bath consist of water and sodium dodecylsulphate of the mass fraction was 3%, which at the spinning speed of 2.5 ml/min, and as-spun fiber was obtained with tensile orientation of fiber at twice tensile speed. The as-spun fiber was washed 3 times with deionized water, and dried at 25 C. for 24 hours to obtain a well-oriented titanium oxide fiber.

Example 15

(20) The colloidal aqueous solution of Ti.sub.0.87O.sub.2.sup.0.52 with a mass fraction of 0.8 mg/ml was added into wet spinning equipment, and injected into the coagulation bath consist of water and polyethylene glycol of the mass fraction was 2.5%, which at the spinning speed of 2.5 ml/min, and as-spun fiber was obtained with tensile orientation of fiber at quadruple tensile speed. The as-spun fiber was washed 3 times with deionized water, and dried at 25 C. for 24 hours to obtain a well-oriented titanium oxide fiber.

Example 16

(21) The colloidal aqueous solution of Ti.sub.0.87O.sub.2.sup.0.52 with a mass fraction of 3.6 mg/ml was added into wet spinning equipment, and injected into the coagulation bath consist of water and chitosan of the mass fraction was 2.5%, which at the spinning speed of 2.5 ml/min, and as-spun fiber was obtained with tensile orientation of fiber at quadruple tensile speed. The as-spun fiber was washed 5 times with deionized water, and dried at 25 C. for 24 hours to obtain a well-oriented titanium oxide fiber.

Example 17

(22) The colloidal aqueous solution of Ti.sub.0.87O.sub.2.sup.0.52 with a mass fraction of 8 mg/ml was added into wet spinning equipment, and injected into the coagulation bath consist of water and chitosan of the mass fraction was 2.5%, which at the spinning speed of 4 ml/min, and as-spun fiber was obtained with tensile orientation of fiber at quadruple tensile speed. The as-spun fiber was washed 3 times with deionized water, and dried at 25 C. for 24 hours to obtain a well-oriented titanium oxide fiber.

Example 18

(23) The colloidal aqueous solution of Ti.sub.0.87O.sub.2.sup.0.52 with a mass fraction of 15 mg/ml was added into wet spinning equipment, and injected into the coagulation bath consist of water and chitosan of the mass fraction was 2.5%, which at the spinning speed of 4 ml/min, and as-spun fiber was obtained with tensile orientation of fiber at quadruple tensile speed. The as-spun fiber was washed 3 times with deionized water, and dried at 25 C. for 24 hours to obtain a well-oriented titanium oxide fiber.

Example 19

(24) The colloidal aqueous solution of Ti.sub.0.87O.sub.2.sup.0.52 with a mass fraction of 15 mg/ml was added into wet spinning equipment, and injected into the coagulation bath consist of water and sodium chloride of the mass fraction was 2.5% and calcium chloride of the mass fraction was 0.5%, which at the spinning speed of 4 ml/min, and as-spun fiber was obtained with tensile orientation of fiber at quintuple tensile speed. The as-spun fiber was washed 3 times with deionized water, and dried at 60 C. for 12 hours to obtain a well-oriented titanium oxide fiber.

Example 20

(25) The colloidal aqueous solution of W.sub.2O.sub.7.sup.2 with a mass fraction of 12 mg/ml was added into wet spinning equipment, and injected into the coagulation bath consist of water and calcium chloride of the mass fraction was 0.2%, which at the spinning speed of 3 ml/min, and as-spun fiber was obtained with tensile orientation of fiber at quadruple tensile speed. The as-spun fiber was washed 3 times with deionized water, and dried at 45 C. for 14 hours to obtain a well-oriented tungsten oxide fiber.

Example 21

(26) The colloidal aqueous solution of TiNb.sub.6O.sub.5.sup.5 with a mass fraction of 8 mg/ml was added into wet spinning equipment, and injected into the coagulation bath consist of water and chitosan of the mass fraction was 0.5%, which at the spinning speed of 1.5 ml/min, and as-spun fiber was obtained with tensile orientation of fiber at quadruple tensile speed. The as-spun fiber was washed 3 times with deionized water, and dried at 55 C. for 12 hours to obtain a well-oriented titanium niobium oxide fiber.

Example 22

(27) The colloidal aqueous solution of Ca.sub.2Nb.sub.3O.sub.10.sup. with a mass fraction of 4 mg/ml was added into wet spinning equipment, and injected into the coagulation bath consist of water and chitosan of the mass fraction was 1.8%, which at the spinning speed of 1.5 ml/min, and as-spun fiber was obtained with tensile orientation of fiber at quadruple tensile speed. The as-spun fiber was washed 3 times with deionized water, and dried at 25 C. for 24 hours to obtain a well-oriented calcium niobium oxide fiber.

Example 23

(28) The colloidal aqueous solution of TaO.sup.3 with a mass fraction of 5 mg/ml was added into wet spinning equipment, and injected into the coagulation bath consist of water and polyethylene glycol of the mass fraction was 4%, which at the spinning speed of 2.5 ml/min, and as-spun fiber was obtained with tensile orientation of fiber at quintuple tensile speed. The as-spun fiber was washed 3 times with deionized water, and dried at 25 C. for 24 hours to obtain a well-oriented tantalum oxide fiber.

Example 24

(29) The colloidal aqueous solution of SrTa.sub.2O.sub.7.sup.2 with a mass fraction of 2.5 mg/ml was added into wet spinning equipment, and injected into the coagulation bath consist of water and calcium chloride of the mass fraction was 2%, which at the spinning speed of 1.5 ml/min, and as-spun fiber was obtained with tensile orientation of fiber at twice tensile speed. The as-spun fiber was washed 3 times with deionized water, and dried at 65 C. for 8 hours to obtain a well-oriented strontium tantalum oxide fiber.

Example 25

(30) The colloidal aqueous solution of LaNb.sub.2O.sub.7.sup. with a mass fraction of 12 mg/ml was added into wet spinning equipment, and injected into the coagulation bath consist of water and chitosan of the mass fraction was 1.5%, which at the spinning speed of 3 ml/min, and as-spun fiber was obtained with tensile orientation of fiber at quadruple tensile speed. The as-spun fiber was washed 3 times with deionized water, and dried at 80 C. for 2 hours to obtain a well-oriented lanthanum niobium oxide fiber.

Example 26

(31) The colloidal aqueous solution of Cs.sub.4W.sub.11O.sub.36.sup.2 with a mass fraction of 8 mg/ml was added into wet spinning equipment, and injected into the coagulation bath consist of water and polyethylene glycol of the mass fraction was 2.5%, which at the spinning speed of 1.5 ml/min, and as-spun fiber was obtained with tensile orientation of fiber at sextuple tensile speed. The as-spun fiber was washed 3 times with deionized water, and dried at 25 C. for 24 hours to obtain a well-oriented cesium tungsten oxide fiber.

Example 27

(32) The colloidal aqueous solution of Nb.sub.6O.sub.17.sup.4 with a mass fraction of 5 mg/ml was added into wet spinning equipment, and injected into the coagulation bath consist of water and cellulose of the mass fraction was 2.5%, which at the spinning speed of 4 ml/min, and as-spun fiber was obtained with tensile orientation of fiber at quadruple tensile speed. The as-spun fiber was washed 3 times with deionized water, and dried at 25 C. for 24 hours to obtain a well-oriented niobium oxide fiber.

Example 28

(33) The colloidal aqueous solution of RuO.sub.2.sup.0.2 with a mass fraction of 4 mg/ml was added into wet spinning equipment, and injected into the coagulation bath consist of water and potassium sulphate of the mass fraction was 1.5%, which at the spinning speed of 2.5 ml/min, and as-spun fiber was obtained with tensile orientation of fiber at quadruple tensile speed. The as-spun fiber was washed 3 times with deionized water, and dried at 45 C. for 16 hours to obtain a well-oriented ruthenium oxide fiber.

Example 29

(34) The colloidal aqueous solution of Ti.sub.0.87O.sub.2.sup.0.52 with a mass fraction of 4 mg/ml was added into wet spinning equipment, and injected into the coagulation bath consist of water and aluminum chloride of the mass fraction was 1.2%, which at the spinning speed of 1.5 ml/min, and as-spun fiber was obtained with tensile orientation of fiber at quintuple tensile speed. The as-spun fiber was washed 3 times with deionized water, and dried at 35 C. for 18 hours to obtain a well-oriented titanium oxide fiber.

Example 30

(35) The colloidal aqueous solution of Ti.sub.0.87O.sub.2.sup.0.52 with a mass fraction of 4 mg/ml was added into wet spinning equipment, and injected into the coagulation bath consist of water and ferric nitrate of the mass fraction was 1.8%, which at the spinning speed of 1.5 ml/min, and as-spun fiber was obtained with tensile orientation of fiber at quadruple tensile speed. The as-spun fiber was washed 3 times with deionized water, and dried at 25 C. for 24 hours to obtain a well-oriented titanium oxide fiber.

Example 31

(36) The colloidal aqueous solution of Ti.sub.0.87O.sub.2.sup.0.52 with a mass fraction of 4 mg/ml was added into wet spinning equipment, and injected into the coagulation bath consist of water and copper sulphate of the mass fraction was 2.1%, which at the spinning speed of 1.5 ml/min, and as-spun fiber was obtained with tensile orientation of fiber at quadruple tensile speed. The as-spun fiber was washed 3 times with deionized water, and dried at 25 C. for 24 hours to obtain a well-oriented titanium oxide fiber.

Example 32

(37) The colloidal aqueous solution of Ti.sub.0.87O.sub.2.sup.0.52 with a mass fraction of 4 mg/ml was added into wet spinning equipment, and injected into the coagulation bath consist of water and magnesium sulphate of the mass fraction was 1.7%, which at the spinning speed of 1.2 ml/min, and as-spun fiber was obtained with tensile orientation of fiber at quadruple tensile speed. The as-spun fiber was washed 3 times with deionized water, and dried at 25 C. for 24 hours to obtain a well-oriented titanium oxide fiber.

Example 33

(38) The colloidal aqueous solution of Ti.sub.0.87O.sub.2.sup.0.52 with a mass fraction of 4 mg/ml was added into wet spinning equipment, and injected into the coagulation bath consist of water and zinc chloride of the mass fraction was 2.4%, which at the spinning speed of 1.2 ml/min, and as-spun fiber was obtained with tensile orientation of fiber at quadruple tensile speed. The as-spun fiber was washed 3 times with deionized water, and dried at 25 C. for 24 hours to obtain a well-oriented titanium oxide fiber.

Example 34

(39) The colloidal aqueous solution of Ti.sub.0.87O.sub.2.sup.0.52 with a mass fraction of 4 mg/ml was added into wet spinning equipment, and injected into the coagulation bath consist of water and lithium fluoride of the mass fraction was 5%, which at the spinning speed of 1.5 ml/min, and as-spun fiber was obtained with tensile orientation of fiber at sextuple tensile speed. The as-spun fiber was washed 3 times with deionized water, and dried at 25 C. for 24 hours to obtain a well-oriented titanium oxide fiber.

Example 35

(40) The colloidal aqueous solution of Ti.sub.0.87O.sub.2.sup.0.52 with a mass fraction of 4 mg/ml was added into wet spinning equipment, and injected into the coagulation bath consist of water and potassium sulphate of the mass fraction was 5%, which at the spinning speed of 1.5 ml/min, and as-spun fiber was obtained with tensile orientation of fiber at quintuple tensile speed. The as-spun fiber was washed 3 times with deionized water, and dried at 25 C. for 24 hours to obtain a well-oriented titanium oxide fiber.

Example 36

(41) The colloidal aqueous solution of Ti.sub.0.87O.sub.2.sup.0.52 with a mass fraction of 4 mg/ml was added into wet spinning equipment, and injected into the coagulation bath consist of water and cellulose of the mass fraction was 2.3%, which at the spinning speed of 1.7 ml/min, and as-spun fiber was obtained with tensile orientation of fiber at octuple tensile speed. The as-spun fiber was washed 3 times with deionized water, and dried at 45 C. for 18 hours to obtain a well-oriented titanium oxide fiber.

Example 37

(42) The colloidal aqueous solution of Ti.sub.0.87O.sub.2.sup.0.52 with a mass fraction of 4 mg/ml was added into wet spinning equipment, and injected into the coagulation bath at the spinning speed of 1.2 ml/min, which consist of water and cetyl trimethyl ammonium bromide with the mass fraction of 5%. As-spun fiber was obtained with tensile orientation of fiber at twice tensile speed. The as-spun fiber was washed 3 times with deionized water, and dried at 25 C. for 24 hours to obtain a well-oriented titanium oxide fiber.