CN112125312A - Method for modifying amino on surface of silicon dioxide nano-particle - Google Patents

Method for modifying amino on surface of silicon dioxide nano-particle Download PDF

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CN112125312A
CN112125312A CN202011088563.2A CN202011088563A CN112125312A CN 112125312 A CN112125312 A CN 112125312A CN 202011088563 A CN202011088563 A CN 202011088563A CN 112125312 A CN112125312 A CN 112125312A
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amino groups
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CN112125312B (en
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王婷
帅哲玮
尤柏儒
蔡成龙
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Southeast University
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    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B33/00—Silicon; Compounds thereof
    • C01B33/113—Silicon oxides; Hydrates thereof
    • C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
    • C01B33/18—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
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Abstract

The invention discloses a method for modifying amino on the surface of silicon dioxide nano particles, which comprises the following steps: placing the dried silicon dioxide nano-particles in a watch glass, and dropwise adding ammonia water to ensure that the ammonia water is not in contact with the particles; placing the whole watch glass in a saturated ammonia environment for standing at constant temperature; placing the sample after constant temperature standing into a plasma cleaning cleaner for treatment; and recovering the sample, washing and drying at room temperature to obtain the silicon dioxide nano-particles with the surface modified with amino groups. The method for modifying amino is simple in process, strong in operability, free of other organic solvents except ammonia water to participate in the reaction, low in manufacturing cost, capable of successfully modifying stable amino on the surface of particles quickly and effectively, and the modified silicon dioxide nanoparticles have good dispersibility and stability.

Description

Method for modifying amino on surface of silicon dioxide nano-particle
Technical Field
The invention belongs to the modification of silicon dioxide nanoparticles, and particularly relates to a method for modifying amino on the surface of silicon dioxide nanoparticles.
Background
Silica is a commonly used inorganic material with good thermal and chemical stability. The nano silicon dioxide has small particle size and good biocompatibility, has the advantages of surface interface effect, small size effect, quantum size effect and the like of nano materials, and is widely applied to the field of high polymer materials. However, the nano silicon dioxide particle has a large amount of active hydroxyl groups on the surface, is strong in hydrophilicity, is easy to agglomerate, and is poor in compatibility and dispersibility with organisms. Therefore, the surface of the nano silica particles needs to be modified to reduce the surface energy, improve the dispersibility and compatibility of the nano silica particles in organic substances and ensure stable storage.
The amino modification of the nano silicon dioxide is a common modification means, and the modified particle surface contains amino (-NH)2) The active amino can react with a plurality of molecules, and the dispersibility and the stability of the particles are obviously improved, so that the application and the performance of the silicon dioxide are expanded. For example, in the field of materials, modified nano-silica is mixed with polypropylene, and although the modified nano-silica can be better dispersed in matrix polypropylene than original nano-silica particles, the structure and performance of the material are difficult to control, and particularly after a polymer is added, the shape of the material is unstable, so that improvement is urgently needed.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the problems in the prior art, the invention provides a method for successfully modifying amino groups on the surface of silica nanoparticles, which can quickly and effectively modify stable amino groups on the surface of silica nanoparticles.
The invention provides an aminated silicon dioxide nano-particle prepared by the modification method.
The technical scheme is as follows: in order to achieve the above purpose, the method for modifying amino groups on the surface of silica nanoparticles comprises the following steps:
(1) placing the dried silicon dioxide nano-particles in a watch glass, dropwise adding ammonia water to ensure that the ammonia water is not in contact with the particles, and avoiding the contact, which can lead to reaction in advance to damage the surface structure of the particles and cause grafting failure;
(2) placing the silicon dioxide particles (the whole surface dish) in the step (1) into a saturated ammonia environment for standing reaction at constant temperature;
(3) placing the silicon dioxide sample subjected to constant temperature standing in the step (2) into a plasma cleaning cleaner for treatment;
(4) and (4) recovering the sample treated in the step (3), washing and drying at room temperature to obtain the silicon dioxide nano-particles with the surface modified with amino groups.
Wherein, in the step (1), 5-20 mg of dried silicon dioxide nano-particles with the particle size of 10-500 nm are placed on a cover of a culture dish with the diameter of 60mm, and a proper amount of 25-28% ammonia water is dripped, wherein the ammonia water is not in contact with the particles.
Preferably, 20mg of dried silica nanoparticles with a particle size of 50nm are placed on a cover of a culture dish with a diameter of 60mm, and 5mL to 20mL of 25% -28% ammonia water is added dropwise, wherein the ammonia water is not in contact with the particles.
Wherein, the step (2) is put into a saturated ammonia environment to react for more than 4 hours at a constant temperature of 80-100 ℃.
Preferably, the reaction is carried out in step (2) in a saturated ammonia gas environment at a constant temperature of 80 ℃ for more than 4 hours.
Wherein, the plasma cleaning cleaner in the step (3) is processed under the voltage of 800V for not less than 5min,
preferably, in the step (3), when the plasma cleaning cleaner is used for treatment, the pressure on the vacuum gauge is reduced to 0-0.9E2And normal use of the equipment is ensured.
Preferably, the plasma cleaning cleaner in the step (3) is a helium plasma cleaning cleaner (JS-1600, Beijing and co-creation science and technology, Inc.).
Wherein, the sample treated in the step (3) is recovered in the step (4), washed 3-4 times by using absolute ethyl alcohol, and then dried at room temperature.
Wherein, the amino group modified on the surface of the silica nanoparticle is derived from saturated ammonia gas.
The aminated silicon dioxide nano-particles prepared by the modification method have no residue of other substances and have high amino grafting rate.
According to the invention, the amino group of the aminated silicon dioxide nano-particle is directly grafted on the surface of the particle, so that the method is low in energy consumption, green and environment-friendly, and is a novel method with great development potential.
Has the advantages that: compared with the prior art, the invention has the following advantages:
1. the modification scheme has the advantages of simple process, strong operability, no need of other organic solvents except ammonia water to participate in the reaction, low manufacturing cost, and capability of quickly and effectively successfully modifying stable amino groups on the particle surface and modifying SiO through the plasma cleaner2NPs have better dispersibility.
2. The amino raw material used in the invention is 25-28% ammonia water, and the preparation process does not need to strictly control the absence of water and enables the ammonia gas volatilized in the system to be attached to the particle surface in the early stage of the reaction. The infrared spectrum characterization result shows that the plasma cleaner is utilized to successfully aminate SiO2SEM and DLS characterization show that SiO is modified after amino group modification2The NPs have good dispersibility and stability, and meanwhile, the amino group of the aminated silicon dioxide nano-particle is directly grafted on the surface of the particle to ensure that an amino peak and the particle cannot be damaged.
Drawings
FIG. 1 is example 1 amination of SiO2The result of the infrared spectrogram of the NPs surface shows that the sample is 1500-2000 cm-1The characteristic peak of free N-H is obvious.
FIG. 2 is the amination of SiO in example 12SEM electron micrographs of the NPs surfaces show that the sample is uniform in particle size and good in dispersity.
Detailed Description
The present invention will be described in detail with reference to specific examples.
The experimental methods described in the examples are all conventional methods unless otherwise specified; the reagents and materials are commercially available, unless otherwise specified.
Oxidation of hydrogen dioxideSilicon nanoparticles (SiO)2NPs) south beijing color nano biotechnology ltd, or other manufacturers;
(helium) plasma cleaners (JS-1600, Beijing and co-creation science and technology, Inc.), but other manufacturers may also be used.
Example 1
20mg of dried silicon dioxide nano-particles with the particle size of 50nm are placed on a cover of a culture dish with the diameter of 60mm, and 150 mu L of ammonia water with the mass fraction of 25% is dripped, wherein the ammonia water is not in contact with the particles. The particle-containing surface dish is placed in a saturated ammonia environment, the temperature of the surface dish is kept constant at 80 ℃ for 4 hours, a sample is placed in a (helium) plasma cleaner (JS-1600, Beijing and Co-Ltd. science and technology), the voltage is adjusted to 800V, and the sample is treated for 5 minutes. And recovering the sample, washing the sample for 3 times by using absolute ethyl alcohol, and drying the sample in a room temperature environment to obtain the silicon dioxide nano-particles with the surface modified with amino groups. Characterization of the infrared spectrum as shown in FIG. 1 shows surface-modified SiO2NPs are 1500-2000 cm-1The characteristic peak of free N-H is obvious, which indicates that aminomethyl is successfully modified. As shown in FIG. 2, SEM characterization results show that SiO with surface modified amino groups2The NPs have uniform particle size and good dispersibility, 2875 and 2940cm-1There is no signal, which indicates that there is no CH on the surface of the particle2Functional groups, and through infrared spectrum analysis, amino groups can be directly modified on the particles and directly grafted on the surfaces of the particles.
Example 2
20mg of dried silicon dioxide nano-particles with the particle size of 50nm are placed on a cover of a culture dish with the diameter of 60mm, and 100 mu L of ammonia water with the mass fraction of 28% is dripped into the culture dish, wherein the ammonia water is not in contact with the particles. Placing the particle-containing surface dish in saturated ammonia gas environment, keeping the temperature at 80 deg.C for 8 hr, placing the sample in (helium gas) plasma cleaner (JS-1600, Beijing and co-creation science and technology, Ltd.), and reducing the pressure on the vacuum meter to 0.9E2The voltage was adjusted to 800V and the treatment was carried out for 5 minutes. The sample was recovered and washed 3 times with absolute ethanol and dried at room temperature. As shown in Table 1, Dynamic Light Scattering (DLS) zeta potential measurements show surface modified SiO2The zeta potential of the NPs has an average value of 8.81 +/-0.36 mV and a standard deviation value of 4.09 percent, and the successful modification is provedThe amino groups are decorated, the particles do not agglomerate, and the electric potential is more uniform and the disperse system is stable.
TABLE 1
Figure BDA0002719965720000031
Figure BDA0002719965720000041
Example 3
Taking 20mg of dried silica nanoparticles (SiO) with a particle size of 50nm2OH) was placed on a lid of a culture dish having a diameter of 60mm, and 50. mu.L of 25% strength by mass aqueous ammonia was added dropwise thereto without contact with the pellets. Placing the particle-containing surface dish in saturated ammonia gas environment, keeping the temperature at 85 deg.C for 12 hr, placing the sample in (helium gas) plasma cleaner (JS-1600, Beijing and co-creation science and technology, Ltd.), and reducing the pressure on the vacuum meter to 0.9E2The voltage was adjusted to 600V and the treatment was carried out for 8 minutes. And recovering the sample, washing the sample for 3 times by using absolute ethyl alcohol, and drying the sample in a room temperature environment to obtain the silicon dioxide nano-particles with the surface modified with amino groups. Infrared spectroscopic characterization shows surface-modified SiO2NPs have no free N-H characteristic peak. The SEM characterization result shows that the particles are uniform and have general dispersibility. The modification effect is general because ammonia is small relative to the amount of particles.
Example 4
20mg of dried silicon dioxide nano-particles with the particle size of 50nm are placed on a cover of a culture dish with the diameter of 60mm, and 200 mu L of ammonia water with the mass fraction of 25% is dripped into the culture dish, wherein the ammonia water is not in contact with the particles. Placing the particle-containing surface dish in saturated ammonia gas environment, keeping the temperature at 80 deg.C for 4 hr, placing the sample in (helium gas) plasma cleaner (JS-1600, Beijing and co-creation science and technology, Ltd.), and reducing the pressure on the vacuum meter to 0.9E2The voltage was adjusted to 750V and the treatment was carried out for 5 minutes. The sample was recovered and washed 3 times with absolute ethanol and dried at room temperature. Infrared spectroscopic characterization shows surface-modified SiO2NPs have distinct free N-H characteristic peaks. SEM characterization results show that the particles are uniform and dispersivePreferably.
Example 5
Example 5 was prepared identically to example 1, except that: 5mg of dry silicon dioxide nano-particles with the particle size of 500nm are placed in a watch glass, ammonia water is dripped, and the mixture is placed in a saturated ammonia environment for constant temperature reaction for 4 hours at 100 ℃.
Example 6
Example 6 was prepared identically to example 1, except that: 20mg of dried silica nanoparticles having a particle size of 10nm were placed in a petri dish, and ammonia was added dropwise.
Comparative example 1
20mg of dried silica nanoparticles having a particle size of 50nm were placed on a lid of a culture dish having a diameter of 60mm, and 150. mu.L of 25% strength aqueous ammonia was dropped to contact the particles. The particle-containing surface dish is placed in a saturated ammonia environment, the temperature of the surface dish is kept constant at 80 ℃ for 4 hours, a sample is placed in a (helium) plasma cleaner (JS-1600, Beijing and Co-Ltd. science and technology), the voltage is adjusted to 800V, and the sample is treated for 5 minutes. The sample was recovered and washed 3 times with absolute ethanol and dried at room temperature. DLS results show that the zeta potential of the particles is-25.7 +/-9 mV, and SiO is modified2The NPs experiment failed.
Comparative example 2
Comparative example 2 was prepared in the same manner as in example 1, except that: SiO modified with amino group can not be prepared without using a plasma cleaner2 NPs。

Claims (10)

1. A method for modifying amino groups on the surface of silica nanoparticles is characterized by comprising the following steps:
(1) placing the dried silicon dioxide nano-particles in a watch glass, and dropwise adding ammonia water to ensure that the ammonia water is not in contact with the particles;
(2) placing the surface vessel containing the silicon dioxide particles in the step (1) into a saturated ammonia environment for standing reaction at constant temperature;
(3) placing the sample subjected to constant temperature standing in the step (2) into a plasma cleaning cleaner for treatment;
(4) and (4) recovering the sample treated in the step (3), washing and drying at room temperature to obtain the silicon dioxide nano-particles with the surface modified with amino groups.
2. The method for modifying amino groups on the surface of silica nanoparticles according to claim 1, wherein in the step (1), 5 to 20mg of dried silica nanoparticles having a particle size of 10 to 500nm are placed in a petri dish, and 5 to 200 μ L of 25 to 28% ammonia water is added dropwise, wherein the ammonia water is not in contact with the particles.
3. The method for modifying the surface of the amino group by the silica nanoparticle as claimed in claim 1, wherein the step (2) is carried out by placing the silica nanoparticle in a saturated ammonia environment and reacting for more than 4 hours at a constant temperature of 80-100 ℃.
4. The method for modifying amino groups on the surface of silica nanoparticles according to claim 1, wherein the plasma cleaning washer in the step (3) is used for treatment, preferably at a voltage of 800V or less for a time of not less than 5 min.
5. The method for modifying amino groups on the surface of silica nanoparticles according to claim 1, wherein the pressure on the vacuum surface is reduced to 0-0.9E when the plasma cleaner is used for the treatment in the step (3)2。
6. The method for modifying amino groups on the surface of silica nanoparticles according to claim 1, wherein the plasma cleaning device in the step (3) is a helium plasma cleaning device.
7. The method for modifying amino groups on the surface of silica nanoparticles according to claim 1, wherein the sample treated in step (3) is recovered in step (4), washed 3-4 times with absolute ethyl alcohol, and then dried at room temperature.
8. The method for modifying the surface of amino groups on the silica nanoparticles according to claim 1, wherein the amino groups modified on the surface of the silica nanoparticles are derived from saturated ammonia gas.
9. An aminated silica nanoparticle prepared by the method for modifying amino group according to claims 1-8.
10. The aminated silica nanoparticle according to claim 9, characterized in that the amino groups of said aminated silica nanoparticle are directly grafted to the particle surface.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114908572A (en) * 2022-05-17 2022-08-16 安徽芙芮雅羽绒有限公司 Modification method for improving hydrophobicity of down feather

Citations (5)

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Publication number Priority date Publication date Assignee Title
JP4820963B2 (en) * 2004-06-28 2011-11-24 株式会社テクノネットワーク四国 Functional silica particles and uses thereof
CN106519298A (en) * 2016-10-26 2017-03-22 河南工程学院 Method for preparing PA66 grafted carbon nano-tube
CN107381586A (en) * 2017-07-19 2017-11-24 东南大学 The method that silica nanoparticle surface modifies amino
US20170342095A1 (en) * 2016-05-25 2017-11-30 Evonik Degussa Gmbh Organofunctional silicon particles, process for the production thereof and use thereof
CN110508244A (en) * 2019-08-27 2019-11-29 中国科学院合肥物质科学研究院 A kind of charcoal adsorbent material and its preparation method and application that surface is modified

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4820963B2 (en) * 2004-06-28 2011-11-24 株式会社テクノネットワーク四国 Functional silica particles and uses thereof
US20170342095A1 (en) * 2016-05-25 2017-11-30 Evonik Degussa Gmbh Organofunctional silicon particles, process for the production thereof and use thereof
CN106519298A (en) * 2016-10-26 2017-03-22 河南工程学院 Method for preparing PA66 grafted carbon nano-tube
CN107381586A (en) * 2017-07-19 2017-11-24 东南大学 The method that silica nanoparticle surface modifies amino
CN110508244A (en) * 2019-08-27 2019-11-29 中国科学院合肥物质科学研究院 A kind of charcoal adsorbent material and its preparation method and application that surface is modified

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114908572A (en) * 2022-05-17 2022-08-16 安徽芙芮雅羽绒有限公司 Modification method for improving hydrophobicity of down feather

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