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Leaf surface nanometer light conversion technology for promoting plant photosynthesis

A photosynthesis and leaf technology, applied in the directions of plant growth regulators, plant growth regulators, botanical equipment and methods, etc., to achieve strong bioluminescence imaging effects, promote the growth of bean sprouts, and be easy to operate.

Active Publication Date: 2019-09-27
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Leaf surface nanometer light conversion technology for promoting plant photosynthesis
  • Leaf surface nanometer light conversion technology for promoting plant photosynthesis
  • Leaf surface nanometer light conversion technology for promoting plant photosynthesis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: NaYF 4 : Preparation of Yb,Er nanoparticles

[0031] A. Mix oleic acid (20ml), sodium hydroxide (1.16g), absolute ethanol (7ml), and deionized water (9ml) evenly, and add 7ml of YCl under vigorous stirring. 3 , YbCl 3 , ErCl 3 Aqueous solution (wherein YCl 3 , YbCl 3 , ErCl 3 A total of 1 mmol, the molar ratio of the three is 39:10:1) and NaF (5 mmol), heated to boiling and reflux, and stirred for 6 hours to obtain a mixture.

[0032] B. Transfer the mixture to a 50mL stainless steel autoclave, and conduct hydrothermal treatment at 190°C for 24h. After the sample was naturally cooled to room temperature, absolute ethanol (20 mL) was added to reflux the mixture and centrifuged three times, and finally dried under vacuum at 60 ° C for 6 h to obtain NaYF 4 : Yb,Er UCNPs.

[0033] figure 1In a) is the NaYF that embodiment 1 obtains 4 : Transmission electron microscope image of Yb, Er nanoparticles, it can be seen from the figure that the prepared nanopa...

Embodiment 2

[0034] Embodiment 2: Preparation of carbon dots

[0035] C. Add 3mmol citric acid and 10mmol thiourea to 10ml acetone, mix and pour into a 30mL stainless steel autoclave, hydrothermally treat at 160°C for 8h, then centrifuge at 15000r / min for 5 minutes; wash with petroleum ether and ethyl acetate The supernatant was centrifuged at 15000r / min for 5 minutes. The final product was dissolved in 20 mL of ethanol to obtain a carbon dot solution (CDs solution).

[0036] figure 1 b in Example 2 is the transmission electron microscope image of the carbon dots obtained in Example 2. From the figure, we can see that the prepared carbon dots are evenly distributed. The illustration is the lattice structure of the carbon dots. From the figure, we can see that the lattice structure is obvious , the lattice fringe spacing is 0.24nm, which conforms to the (100) carbon graphene crystal plane.

Embodiment 3

[0037] Example 3: NaYF 4 : Preparation of Yb, Er / carbon dot nanocomposite luminescent material

[0038] D, get 4mL silica sol (with TEOS, EtOH, H 2 O and hydrochloric acid with a pH value of 2 were mixed according to the molar ratio of 1:4:5:0.2, refluxed at a temperature of 100°C for 90 minutes, and the final pH value was adjusted to 2 to obtain a silica sol), and 0.1 g of NaYF obtained in Example 1 was added 4 : Yb, Er UCNPs, then 1ml of the CDs solution obtained in Example 2 was poured into the mixed solution; the mixed system continued to stir until a uniform gel was formed. The resulting gel was vacuum dried at 60°C for 6 hours, and finally the dried product was ground into uniform particles, namely NaYF 4 : Yb, Er / carbon dot nanocomposite luminescent material.

[0039] figure 1 C in the NaYF that embodiment 3 obtains 4 : Transmission electron microscope image of Yb, Er / carbon dot nanocomposite luminescent material. From the figure we can see that the prepared NaYF ...

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Abstract

The invention belongs to the technical field of nanomaterials, and discloses a leaf surface nanometer light conversion method for promoting plant photosynthesis. The preparing method specifically includes the following steps of A, preparing soil silicon dioxide through an oil bath backflow method; B, preparing hexagonal phase NaYF4:Yb,Er up-conversion nanoparticles through oil bath backflow and a hydrothermal method; C, preparing CDs through the hydrothermal method; D, compounding the sol silicon dioxide, carbon dots and NaYF4:Yb,Er through a mechanical stirring mode, and conducting washing and drying to obtain a NaYF4:Yb,Er / carbon dot nanometer compound light conversion material. The obtained nanometer compound light conversion material is prepared into turbid liquid to be sprayed on leaf surfaces of bean seedlings, the light conversion (absorption of near infrared light and emission of red light) of the leaf surfaces is realized, and therefore the photosynthetic rate of the bean seedlings is increased, and the fluorescent imaging of the leaves of the bean seedlings is conducted. The prepared composite nanoparticles have high water dispersibility and stability. The method has potential application prospects in illumination agriculture and plant imaging.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, in particular to a method for nanometer light conversion on the surface of leaves for promoting photosynthesis of bean sprouts. Background technique [0002] As an important part of the environment, plants play an important role in maintaining ecological balance and are one of the main food sources for animals and humans. The energy required for plant growth and morphogenesis is mainly provided by light, and various physiological behaviors in plant nutrition and reproductive growth are realized through photosynthesis. Plants convert solar energy into chemical energy through photosynthesis, which is a normal physiological metabolic process. It is well known that light from ultraviolet light to 800nm ​​wavelength has certain effects on the morphological structure of plants. Especially blue light (400-500nm), red light (600nm-700nm) and far-red light (700nm-800nm) have important effect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01G31/00A01G7/06A01N59/16C09K11/85A01P21/00
CPCA01G7/06A01G31/00A01N59/16C09K11/7773A01N59/00
Inventor 庄健乐许晓凯许粮锋刘应亮雷炳富郑义浩
Owner SOUTH CHINA AGRI UNIV
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