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Preparation method of nano silver solution and polyaniline/ silver nanocomposite

A technology of nano-silver sol and composite materials, which is applied in the field of preparation of nano-silver sol and polyaniline/silver nano-composite materials to achieve the effects of uniform particle size distribution, less equipment, and simplified cumbersome steps

Active Publication Date: 2012-06-20
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that the protective agent and reducing agent used in the synthesis of nano-silver are equivalent to impurities for subsequent reactions, and the removal process is relatively cumbersome, but the in-situ oxidation method is more controllable, and different silver can be synthesized according to requirements. Content and Microscopic Morphology of PANI / Ag Nanocomposites

Method used

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  • Preparation method of nano silver solution and polyaniline/ silver nanocomposite
  • Preparation method of nano silver solution and polyaniline/ silver nanocomposite
  • Preparation method of nano silver solution and polyaniline/ silver nanocomposite

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preparation example Construction

[0041] The present invention at first provides a kind of preparation method of nano-silver sol, and concrete steps are as follows:

[0042] Step 1, according to the molar ratio of linear alkylbenzene sulfonic acid, aniline, silver nitrate is: (6~10): 2: (4~5) prepare raw material, first take 4 / 5 of required deionized water amount, add For linear alkylbenzene sulfonic acid, stir for fifteen minutes to dissolve and disperse evenly;

[0043] Add aniline to the above solution, and continue stirring rapidly for half an hour to make the solution clear;

[0044] Dissolve silver nitrate in one-fifth of the required amount of deionized water, add it to the aforementioned solution, and continue stirring for half an hour until the mixture is evenly distributed.

[0045] The concentration of silver nitrate in the mixed solution is 0.01-0.1mol / L.

[0046] Step 2. Add dropwise 1 mol / L sodium hydroxide solution to the mixed solution prepared in step 1 until it completely turns yellowish br...

Embodiment 1

[0062] Nano silver sol preparation:

[0063] At room temperature, add 1.630g of dodecylbenzenesulfonic acid (0.005mol) to 40mL of deionized water, stir for fifteen minutes to dissolve it completely; then add 0.093g of aniline (0.001mol) to it, and stir for half an hour until the solution becomes clarify. Add 0.425g of silver nitrate (0.0025mol) to 10mL of deionized water, stir to dissolve it and pour it into the former, and continue to stir for half an hour.

[0064] Slowly add 1mol / L NaOH solution dropwise to the above 50mL mixed solution until the reaction solution completely turns yellow-brown turbid; continue to stir at room temperature for 48 hours to obtain nano-silver hydrosol.

[0065] The obtained nano-silver hydrosol is placed statically and can be used for the preparation of polyaniline / silver nano-composite materials at any time; if relatively pure nano-silver powder or sol is needed, then take the obtained nano-silver hydrosol in a centrifuge tube and centrifuge ...

Embodiment 2

[0070] At room temperature, add 1.956g of dodecylbenzenesulfonic acid (0.006mol) to 40mL of deionized water, stir for fifteen minutes to dissolve completely; then add 0.850g of aniline (0.002mol) to it, and stir for half an hour until the solution becomes clarify. Add 0.425g of silver nitrate (0.005mol) to 10mL of deionized water, stir to dissolve it, pour it into the former, and continue to stir for half an hour.

[0071] Slowly add 1mol / L NaOH solution dropwise to the above 50mL reaction solution until the reaction solution completely turns yellowish brown and turbid; continue to stir at room temperature for 24 hours to react to obtain nano-silver hydrosol.

[0072] The obtained nano-silver hydrosol is placed statically and can be used for the preparation of polyaniline / silver nano-composite materials at any time; if a relatively pure nano-silver sol or powder is needed, then take the obtained nano-silver hydrosol in a centrifuge tube and centrifuge at 12000rpm for 20 ~30 m...

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Abstract

The invention discloses a preparation method of nano silver solution and polyaniline / silver nanocomposite, belonging to the field of nanometer preparation and polymer inorganic matter nanocomposite. Linear alkyl benzene sulphonic acid is used as protective agent; silver oxide colloid generated by sodium hydroxide and silver nitrate serves as a precursor; aniline reduces the silver oxide colloid to prepare nano silver solution. In the preparation method of polyaniline / silver nanocomposite, the nano silver solution prepared by the above steps is directly adopted; the preparation method simplifies the fussy steps for removing the protective agent and reducing agent and saves material and energy compared with other in-situ oxidation styles; nano silver particles have favourable composite effect with generated polyaniline matrix; the whole preparation process is carried out at constant temperature and pressure; the adopted solvent is deionized water, and the preparation process is simple, needs fewer devices and has low comprehensive cost.

Description

technical field [0001] The invention belongs to the field of preparing nanometer metal and polymer / inorganic nanocomposite materials, and in particular relates to a preparation method of nanometer silver sol and polyaniline / silver nanocomposite materials. Background technique [0002] As an important conductive polymer, polyaniline has received extensive attention and attention due to its relatively cheap monomer, simple synthesis process and less harsh conditions, good chemical stability, high temperature resistance, and controllable changes in electrical conductivity and other physical properties. Research. In terms of practical applications, polyaniline has broad prospects in electromagnetic shielding, solar cells, supercapacitors, antistatic materials, electrochromic devices, chemical sensors, corrosion resistance, gas separation, and electrochemical catalysis (S.Bhadra, D . Khastgir, N.K. Singha, J.H. Lee, Prog. Polym. Sci., 2009, 34, 783-810). Metal nanomaterials hav...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24C08G73/02C08K3/08
Inventor 杨继萍尹华杰
Owner BEIHANG UNIV
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