A preparation method of amorphous pomegranate-shaped nanocellulose
Amorphous garnet-like nanocellulose was prepared by a combined method of cellulose dissolution-hydrophobic modification-regeneration, which solved the problems of structural uniformity and interfacial compatibility of traditional nanocellulose. This method achieves the preparation of nanocellulose with uniform size and specific morphology, and is environmentally friendly and efficient.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SICHUAN AGRI UNIV
- Filing Date
- 2025-03-27
- Publication Date
- 2026-05-29
AI Technical Summary
Traditional nanocellulose has a simple structure, is prone to aggregation, has a complex preparation process and causes environmental pollution, and its high crystallinity leads to poor interfacial compatibility.
A combined method of cellulose dissolution-hydrophobic modification-regeneration was adopted, in which hydrophobic functional groups were introduced by hydrophobic modifier in the dissolved state, and amorphous garnet-like nanocellulose was formed by van der Waals forces.
Amorphous garnet-like nanocellulose with uniform size and specific morphology was prepared, which solved the problems of structural uniformity and interfacial compatibility of traditional nanocellulose. Moreover, the method is green, simple and low energy consumption.
Smart Images
Figure CN120058973B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of nanocellulose technology, specifically relating to a method for preparing amorphous garnet-like nanocellulose. Background Technology
[0002] Cellulose nanomaterials, as a novel bio-based nanomaterial, have shown great application potential in composite materials, biomedicine, flexible electronics, and energy storage in recent years due to their high specific surface area, biodegradability, excellent mechanical properties, and surface modifiability. However, traditional cellulose nanomaterials (such as rod-shaped cellulose nanoparticles (CNC) and fibrous cellulose nanoparticles (CNF)) still face many technical bottlenecks in practical applications: 1. Limited by structural uniformity: Existing cellulose nanomaterials are mostly fibrous or rod-shaped, and their functional applications are limited by insufficient morphological uniformity. Especially when loaded with functional nanoparticles, they are prone to agglomeration, resulting in low interfacial bonding strength and uneven stress distribution in composite materials. 2. Complex preparation process: Traditional methods require strong acid hydrolysis or high-pressure homogenization to extract cellulose nanomaterials, which is energy-intensive and easily causes environmental pollution. 3. High crystallinity: Traditional rod-shaped and fibrous cellulose nanomaterials have high crystallinity, resulting in poor interfacial compatibility.
[0003] Pomegranate-like materials are a novel type of material with a biomimetic pomegranate structure. Due to their unique structure, pomegranate-like materials have attracted considerable attention in fields such as catalyst supports and intelligent sensing. The main advantages of pomegranate-like materials include: they help isolate inclusions from the external environment, effectively preventing inclusion aggregation and improving structural stability; they also provide a buffering effect, enhancing the impact resistance and expansion resistance of inclusions; their relatively large specific surface area provides numerous interfaces or active sites; and they address interfacial incompatibility issues. Pomegranate-like nanomaterials have significant advantages in applications such as functional material encapsulation, material stabilization, and dispersion. Summary of the Invention
[0004] This invention addresses the shortcomings of traditional nanocellulose by combining the biomimetic structural advantages of garnet-like materials, providing a method for preparing amorphous garnet-like nanocellulose. The method involves dissolving cellulose into a dispersed molecular chain state, then hydrophobically modifying it by introducing hydrophobic functional groups into the cellulose molecular chain structure to obtain hydrophobic cellulose. This weakens the strong hydrogen bonds within and between cellulose molecules. An antisolvent is then added, causing the hydrophobic cellulose to self-assemble into primary particles via van der Waals forces. The high surface energy of these primary particles promotes aggregation, reducing the total energy and ultimately assembling into amorphous garnet-like nanocellulose. The prepared amorphous garnet-like nanocellulose exhibits a distinct garnet-like structure, is amorphous, has uniform size, high yield, and the preparation method is simple, environmentally friendly, and low-cost.
[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a method for preparing amorphous garnet-shaped nanocellulose, characterized in that the method comprises: firstly, dissolving cellulose-containing raw materials in a specific solvent to form a cellulose solution with a concentration of 0.001 wt%-15 wt%; then adding a hydrophobic modifier to the cellulose solution to hydrophobically modify the dissolved cellulose to obtain a hydrophobic cellulose solution; then mixing the hydrophobic cellulose solution with an antisolvent to diffuse and precipitate the hydrophobically modified cellulose to obtain a suspension of amorphous garnet-shaped nanocellulose; finally washing the suspension with an antisolvent until the solvent and hydrophobic modifier for dissolving the cellulose are completely removed; and drying to obtain amorphous garnet-shaped nanocellulose.
[0006] The specific solvent is a solvent that can dissolve cellulose;
[0007] The hydrophobic modifier is a modifier that can introduce hydrophobic chlorine-containing functional groups into the cellulose structure;
[0008] The antisolvent is a solvent that does not dissolve cellulose but is miscible with a specific solvent;
[0009] The concentration of the hydrophobic cellulose solution is 0.001 wt%-15 wt%.
[0010] Preferably, before adding the hydrophobic modifier, the cellulose solution is purified by centrifugation at 5000 r / min, and the supernatant is taken as the purified cellulose solution. Then, the hydrophobic modifier is added to modify the dissolved cellulose.
[0011] Preferably, the specific solvent is one or a mixture of two or more of the following: 1-butyl-3-methylimidazolium chloride, 1-allyl-3-methylimidazolium chloride, LiCl / N,N-dimethylacetamide (DMAc) / water, LiBr / DMAc, sodium hydroxide / urea / water, sodium hydroxide / thiourea / water, and sodium hydroxide / thiourea / urea / water.
[0012] Preferably, the hydrophobic modifier is a chlorination modifier, specifically thionyl chloride, phosphorus oxychloride, or p-toluenesulfonyl chloride.
[0013] Preferably, the antisolvent is one or a mixture of two or more solvents selected from water, alcohols, ketones, esters, ethers, aromatic hydrocarbons, and alkanes.
[0014] Preferably, the mixing diffusion is direct antisolvent addition and stirring diffusion or dialysis diffusion. During mixing diffusion, stirring and heating methods can be used to enhance the mixing efficiency.
[0015] Preferably, the obtained amorphous garnet-like nanocellulose is used as a cellulose-containing raw material and is dissolved again in a specific solvent to form a hydrophobic cellulose solution with a concentration of 0.001 wt%-15 wt%. The hydrophobic cellulose solution is then mixed with an antisolvent to diffuse and precipitate the hydrophobically modified cellulose, resulting in a suspension of amorphous garnet-like nanocellulose. The suspension of amorphous garnet-like nanocellulose is washed with an antisolvent or dialysis to completely remove the solvent and hydrophobic modifier that dissolved the cellulose. After drying, amorphous garnet-like nanocellulose is obtained.
[0016] Compared with the prior art, the present invention has the following advantages:
[0017] 1. This invention employs an undisclosed cellulose dissolution-hydrophobic modification-regeneration combined method. First, cellulose molecular chains are dissolved, and then hydrophobic modification is performed. Subsequently, amorphous garnet-like nanocellulose is successfully prepared by the self-assembly of dispersed hydrophobic cellulose through van der Waals forces. Moreover, only this morphology exists, and the size is uniform with a narrow particle size distribution.
[0018] 2. In this invention, the hydrophobic modification of cellulose is carried out in a dissolved state (homogeneous system). The modified hydrophobic cellulose solution is also in a dispersed state, which is beneficial for the subsequent preparation of amorphous garnet-shaped nanocellulose. Moreover, the prepared garnet-shaped nanocellulose exhibits a special amorphous structure.
[0019] 3. This invention uses a green, simple, safe, low-energy-consumption, and high-efficiency method to prepare amorphous garnet-like nanocellulose.
[0020] 4. The raw materials used in this invention are cellulose-containing raw materials, which are widely available and have low requirements.
[0021] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description
[0022] Figure 1 The X-ray diffraction spectrum of amorphous garnet-like nanocellulose prepared by cellulose chloride solution in Example 1 of this invention is shown.
[0023] Figure 2 This is a scanning electron microscope image of the amorphous garnet-like nanocellulose prepared in Example 2 of the present invention.
[0024] Figure 3 This is a scanning electron microscope image of the amorphous garnet-like nanocellulose prepared in Example 3 of the present invention.
[0025] Figure 4 This is a scanning electron microscope image of the amorphous garnet-like nanocellulose prepared in Example 4 of the present invention.
[0026] Figure 5 This is a scanning electron microscope image of the amorphous garnet-like nanocellulose prepared in Example 5 of the present invention.
[0027] Figure 6 This is a scanning electron microscope image of the nanocellulose prepared in Comparative Example 1 of the present invention. Detailed Implementation
[0028] Example 1
[0029] This embodiment discloses a method for preparing amorphous garnet-like nanocellulose, the method comprising:
[0030] Microcrystalline cellulose was dispersed in DMAc, and the mixture was vigorously stirred at 110 °C for 1 h to obtain an activated cellulose suspension. After the suspension was cooled, it was filtered and washed with deionized water and dried to obtain activated cellulose.
[0031] Activated cellulose was dispersed in a 9 wt% LiCl / DMAc solution and stirred vigorously at 125 °C for 2.5 h, followed by stirring at room temperature (25 °C) for 12 h to obtain a solution. The solution was centrifuged at 11000 r / min for 20 min to separate the insoluble components, yielding a 1.5 wt% cellulose solution on top. Hydrophobic modifier thionyl chloride (SOCl2) was added to the cellulose solution under reflux and nitrogen protection at 80 °C (the molar ratio of SOCl2 to the dehydrated glucose units of cellulose was 10:1), and the reaction was maintained under the above conditions with stirring for 4 h to obtain a chlorocellulose solution (chlorocellulose is a hydrophobic cellulose). The chlorocellulose solution was precipitated in a dialysis bag and dialyzed against deionized water at 30 °C for 48 h, with the deionized water replaced periodically until LiCl and DMAc were completely removed. After drying, amorphous chlorocellulose nanoparticles resembling garnet were obtained.
[0032] The X-ray diffraction spectrum of the amorphous garnet-like nanocellulose prepared in this embodiment is as follows: Figure 1 As shown, a weak and broad signal was observed, and no crystallization peak signal was observed, confirming the amorphous structural characteristics of chlorinated garnet-like nanocellulose.
[0033] Example 2
[0034] This embodiment discloses a method for preparing amorphous garnet-like nanocellulose, the method comprising:
[0035] Microcrystalline cellulose was dispersed in DMAc, and the mixture was vigorously stirred at 110 °C for 1 h to obtain an activated cellulose suspension. After the suspension was cooled, it was filtered and washed with deionized water and dried to obtain activated cellulose.
[0036] Activated cellulose was dispersed in a 9 wt% LiCl / DMAc solution and stirred vigorously at 125 °C for 2.5 h, followed by stirring at room temperature (25 °C) for 12 h to obtain a solution. The solution was centrifuged at 11000 r / min for 20 min to separate the insoluble components, yielding a 1.5 wt% cellulose solution on top. Thionyl chloride (SOCl2) was added to the cellulose solution at 80 °C under reflux and nitrogen protection (the molar ratio of SOCl2 to cellulose dehydrated glucose units was 10:1), and the reaction was maintained under the above conditions for 4 h to obtain a chlorinated cellulose solution. The chlorinated cellulose solution was slowly added dropwise to 2 L of deionized water under stirring at 500 r / min to precipitate cellulose chloride, resulting in a suspension of chlorinated amorphous garnet-like nanocellulose. The suspension of chlorinated amorphous garnet-like nanocellulose was then washed with deionized water as an antisolvent by filtration to remove LiCl and SOCl2, yielding chlorinated amorphous garnet-like nanocellulose.
[0037] 1.0 g of dried amorphous garnet-like nanocellulose was added to 60 mL of DMAc. The mixture was stirred until the chlorinated amorphous garnet-like nanocellulose was completely dissolved in DMAc. The solution was centrifuged at 11000 r / min for 20 min to separate the insoluble components, resulting in a 0.75 wt% cellulose chloride solution dissolved in DMAc. 40 mL of this 1.75 wt% cellulose chloride solution was placed in a dialysis bag to precipitate the cellulose chloride. Dialysis was performed at 30 ℃ with deionized water for 48 h, with the deionized water being changed periodically until DMAc was completely removed. After drying, the product was obtained. The prepared product was subjected to scanning electron microscopy, as shown in the figure. Figure 2 As shown in the figure, the product has an amorphous garnet-like morphology with uniform particle size and no other morphological forms of cellulose.
[0038] In this embodiment, the chlorinated amorphous garnet-shaped nanocellulose is dissolved and precipitated again in order to obtain amorphous garnet-shaped nanocellulose particles with better morphology and more thorough removal of impurities.
[0039] Example 3
[0040] This embodiment discloses a method for preparing amorphous garnet-like nanocellulose, the method comprising:
[0041] Microcrystalline cellulose was dispersed in DMAc, and the mixture was vigorously stirred at 110 °C for 1 h to obtain an activated cellulose suspension. After cooling, the suspension was filtered and washed with deionized water and dried to obtain activated cellulose. The activated cellulose was dispersed in a 9 wt% LiCl / DMAc solution, and the mixture was vigorously stirred at 125 °C for 2.5 h, followed by stirring at room temperature (25 °C) for 12 h to obtain a solution. The solution was centrifuged at 11000 r / min for 20 min to separate the insoluble components, obtaining a 1.5 wt% cellulose solution on top. Thionyl chloride (SOCl2) (molar ratio of SOCl2 to cellulose dehydrated glucose units of 10:1) was added to the cellulose solution at 80 °C under reflux and nitrogen protection, and the reaction was maintained under the above conditions with stirring for 4 h to obtain a cellulose chloride solution. Under stirring at 500 r / min, the chlorinated cellulose solution was slowly added dropwise to 2 L of deionized water to precipitate the chlorinated cellulose, resulting in a suspension of chlorinated amorphous garnet-like nanocellulose. The suspension of chlorinated amorphous garnet-like nanocellulose was then washed by filtration with deionized water as an antisolvent to remove LiCl and SOCl2, and dried to obtain chlorinated amorphous garnet-like nanocellulose.
[0042] 1.0 g of dried amorphous garnet-like nanocellulose was added to 60 mL of DMAc and stirred until the chlorinated amorphous garnet-like nanocellulose was completely dissolved in DMAc. The solution was centrifuged at 10000 r / min for 10 min to separate the insoluble fraction, yielding a 1.75 wt% chlorinated cellulose solution dissolved in DMAc. 10 mL of the chlorinated cellulose / DMAc solution was transferred to a dialysis bag and dialyzed with deionized water for 3 days until DMAc was removed. The precipitate was separated by centrifugation at 11000 r / min for 8 min, and dried to obtain amorphous garnet-like nanocellulose (e.g., chlorinated garnet nanocellulose). Figure 3 (As shown).
[0043] Example 4
[0044] This embodiment discloses a method for preparing amorphous garnet-like nanocellulose, the method comprising:
[0045] Bamboo cellulose was dispersed in 91 g of DMAc, and the mixture was vigorously stirred at 110 °C for 1 h to obtain an activated cellulose suspension. After the suspension cooled, 9 g of LiCl was added to prepare a 9 wt% LiCl / DMAc solution. The mixture was heated to 125 °C and vigorously stirred for 2.5 h, followed by stirring at room temperature (25 °C) for 12 h to obtain a solution. The solution was centrifuged at 11000 r / min for 20 min to separate the insoluble components, yielding a 1.5 wt% cellulose solution on top. Thionyl chloride (SOCl2) was added to the cellulose solution at 80 °C under reflux and nitrogen protection (the molar ratio of SOCl2 to the dehydrated glucose units of cellulose was 10:1), and the reaction was maintained under the above conditions with stirring for 4 h to obtain a cellulose chloride solution. Under stirring at 500 r / min, the chlorinated cellulose solution was slowly added dropwise to 2 L of deionized water to precipitate the chlorinated cellulose, resulting in a suspension of chlorinated amorphous garnet-like nanocellulose. The suspension of chlorinated amorphous garnet-like nanocellulose was then washed by filtration with deionized water as an antisolvent to remove LiCl and SOCl2, and dried to obtain chlorinated amorphous garnet-like nanocellulose.
[0046] Add 0.5 g of dried amorphous garnet-like nanocellulose to 100 mL of DMAc and stir for 1 h until the chlorinated amorphous garnet-like nanocellulose is completely dissolved in DMAc. Centrifuge the solution at 10000 r / min for 10 min to separate the insoluble components and obtain a 0.5 wt% chlorinated cellulose solution dissolved in DMAc. Take 5 mL of the chlorinated cellulose / DMAc solution into a 100 mL tall beaker and stir the solution with a magnetic stirrer at 300 r / min. At the same time, use a peristaltic pump to add deionized water dropwise along the beaker wall at a rate of 5 mL / min, for a total of 60 mL, to precipitate chlorinated cellulose and obtain a suspension of garnet-like nanocellulose. Centrifuge at 11000 r / min for 8 min to separate the precipitate and wash the precipitate with deionized water until DMAc is removed. After drying, obtain amorphous garnet-like nanocellulose (e.g., chlorinated cellulose nanocellulose). Figure 4 (As shown).
[0047] Example 5
[0048] This embodiment discloses a method for preparing amorphous garnet-like nanocellulose, the method comprising:
[0049] Microcrystalline cellulose was dispersed in 91 g of DMAc, and the mixture was vigorously stirred at 110 °C for 1 h to obtain an activated cellulose suspension. After the suspension cooled, 9 g of LiCl was added to prepare a 9 wt% LiCl / DMAc solution, and the mixture was vigorously stirred at 125 °C for 2.5 h. Subsequently, it was stirred at room temperature (25 °C) for 12 h to obtain a solution. The solution was centrifuged at 11000 r / min for 20 min to separate the insoluble components, yielding a 1.5 wt% cellulose solution on top. Thionyl chloride (SOCl2) was added to the cellulose solution at 80 °C under reflux and nitrogen protection (the molar ratio of SOCl2 to the cellulose dehydrated glucose unit was 10:1), and the reaction was maintained under the above conditions with stirring for 4 h to obtain a cellulose chloride solution. Under stirring at 500 r / min, the chlorinated cellulose solution was slowly added dropwise to 2 L of deionized water to precipitate the chlorinated cellulose, resulting in a suspension of chlorinated amorphous garnet-like nanocellulose. The suspension of chlorinated amorphous garnet-like nanocellulose was then washed with deionized water as an antisolvent to remove excess LiCl and SOCl2, and dried to obtain chlorinated amorphous garnet-like nanocellulose.
[0050] Add 1.0 g of dried amorphous garnet-like nanocellulose to 100 mL of DMAc and stir for 1 h until the chlorinated amorphous garnet-like nanocellulose is completely dissolved in DMAc. Centrifuge the solution at 10000 r / min for 10 min to separate the insoluble components and obtain a 1 wt% chlorinated cellulose solution dissolved in DMAc. Take 5 mL of the chlorinated cellulose / DMAc solution into a 100 mL tall beaker and stir the solution with a magnetic stirrer at 300 r / min. At the same time, use a peristaltic pump to add deionized water dropwise along the beaker wall at a rate of 5 mL / min, for a total of 60 mL, to precipitate chlorinated cellulose and obtain a suspension of garnet-like nanocellulose. Centrifuge at 11000 r / min for 8 min to separate the precipitate and wash the precipitate with deionized water until DMAc is removed. After drying, obtain amorphous garnet-like nanocellulose (e.g., chlorinated garnet-like nanocellulose). Figure 5 (As shown).
[0051] In the above embodiments, the specific solvent may also be one or a mixture of two or more of the following: 1-allyl-3-methylimidazolium chloride, LiCl / N,N-dimethylacetamide / water, LiBr / DMAc, sodium hydroxide / urea / water, sodium hydroxide / thiourea / water, and sodium hydroxide / thiourea / urea / water.
[0052] Acetyl chloride, as a hydrophobic modifier, can also be modified by other chlorination modifiers, such as phosphorus oxychloride or p-toluenesulfonyl chloride.
[0053] Water, as an antisolvent, can also be replaced by one or more of the following solvents: alcohols, ketones, esters, ethers, aromatic hydrocarbons, and alkanes.
[0054] Comparative Example 1
[0055] Microcrystalline cellulose was dispersed in 91 g DMAc, and the mixture was stirred vigorously at 110 °C for 1 h to obtain an activated cellulose suspension. After the suspension was cooled, it was filtered and washed with deionized water and dried to obtain activated cellulose.
[0056] Activated cellulose was dispersed in a 9 wt% LiCl / DMAc solution and stirred vigorously at 125 °C for 2.5 h, followed by stirring at room temperature (25 °C) for 12 h to obtain a solution. The solution was centrifuged at 11000 r / min for 20 min to separate the insoluble fraction, yielding a 1.5 wt% cellulose solution on top. The cellulose solution was placed in a 100 mL tall beaker and stirred with a magnetic stirrer at 300 r / min. Simultaneously, deionized water was added dropwise along the beaker wall at a rate of 5 mL / min using a peristaltic pump, for a total of 60 mL, to regenerate and precipitate the cellulose, resulting in a suspension of spherical nanocellulose. The precipitate was separated by centrifugation at 11000 r / min for 8 min, washed with deionized water until LiCl / DMAc was removed, and then dried to obtain nanocellulose.
[0057] Compared with Example 5, this comparative example only omits the step of dissolving thionyl chloride-modified cellulose. Figure 6 The image shows a scanning electron microscope (SEM) image of the nanocellulose prepared in this comparative example. As can be seen from the image, the white particles are spherical nanocellulose, while some are sheet-like or block-like cellulose particles. This indicates that the regenerated cellulose in Comparative Example 1 exhibits multiple morphologies, and the size of the granular cellulose is much smaller than that of the garnet-shaped nanocellulose. This demonstrates that hydrophobic modification of cellulose introduces hydrophobic functional groups, weakening the strong intramolecular and intermolecular hydrogen bonds. The addition of an antisolvent allows the hydrophobic cellulose to self-assemble into primary particles via van der Waals forces. The high surface energy of these primary particles promotes aggregation to reduce total energy, resulting in size growth and morphological changes. Ultimately, they assemble into amorphous garnet-shaped nanocellulose, and only this single morphology is produced.
[0058] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any way. Any simple modifications, alterations, and equivalent changes made to the above embodiments based on the inventive essence shall still fall within the protection scope of the present invention.
Claims
1. A method for preparing amorphous garnet-like nanocellulose, characterized in that, The method is as follows: First, the cellulose-containing raw material is dissolved in a specific solvent to form a cellulose solution with a concentration of 0.001 wt%-15 wt%. Then, a hydrophobic modifier is added to the cellulose solution to hydrophobically modify the dissolved cellulose and obtain a hydrophobic cellulose solution. The hydrophobic cellulose solution is then mixed with an antisolvent to diffuse and precipitate the hydrophobically modified cellulose, resulting in a suspension of amorphous garnet-like nanocellulose. The mixed diffusion is either direct antisolvent-added stirring diffusion or dialysis diffusion; The specific method for preventing solvent diffusion by stirring is as follows: under stirring at a speed of 500 r / min, the hydrophobic cellulose solution is slowly dropped into 2 L of deionized water to precipitate the hydrophobic cellulose; The specific method of dialysis diffusion is as follows: the hydrophobic cellulose solution is placed in a dialysis bag for precipitation, and dialyzed with deionized water at 30 °C for 48 h, with the deionized water being replaced periodically; The suspension of the amorphous garnet-shaped nanocellulose is completely cleaned by anti-solvent washing or by dialysis to remove the specific solvent and hydrophobic modifier that dissolve the cellulose, and then dried to obtain amorphous garnet-shaped nanocellulose. The specific solvent is one or a mixture of two or more of the following: 1-butyl-3-methylimidazolium chloride, 1-allyl-3-methylimidazolium chloride, LiCl / N,N-dimethylacetamide / water, LiBr / DMAc, sodium hydroxide / urea / water, sodium hydroxide / thiourea / water, and sodium hydroxide / thiourea / urea / water. The hydrophobic modifier is thionyl chloride; the molar ratio of thionyl chloride to cellulose dehydrated glucose unit is 10:1; The concentration of the hydrophobic cellulose solution is 0.001 wt%-15 wt%; The antisolvent is a solvent that does not dissolve cellulose but is miscible with a specific solvent.
2. The method for preparing amorphous garnet-like nanocellulose according to claim 1, characterized in that, Before adding the hydrophobic modifier, the cellulose solution was centrifuged at 5000 r / min for purification. The supernatant was taken as the purified cellulose solution, and then the hydrophobic modifier was added to modify the dissolved cellulose.
3. A method for preparing amorphous garnet-like nanocellulose according to claim 1 or 2, characterized in that, The antisolvent is one or a mixture of two or more solvents selected from water, alcohols, ketones, esters, ethers, aromatic hydrocarbons, and alkanes.
4. A method for preparing amorphous garnet-like nanocellulose according to claim 1 or 2, characterized in that, The mixing and diffusion process employs heating to enhance mixing efficiency.
5. A method for preparing amorphous garnet-like nanocellulose according to claim 1 or 2, characterized in that, The obtained amorphous garnet-shaped nanocellulose is used as a cellulose-containing raw material and is dissolved again in a specific solvent to form a hydrophobic cellulose solution with a concentration of 0.001 wt%-15 wt%. The hydrophobic cellulose solution is then mixed with an antisolvent to diffuse and precipitate the hydrophobically modified cellulose, resulting in a suspension of amorphous garnet-shaped nanocellulose. The suspension of amorphous garnet-shaped nanocellulose is washed with an antisolvent or dialysis to completely remove the solvent and hydrophobic modifier that dissolved the cellulose. After drying, amorphous garnet-shaped nanocellulose is obtained.