Unlock instant, AI-driven research and patent intelligence for your innovation.

A globulomer micro-nano hierarchical structure (k,na)nbo 3 Crystal and its preparation method

A hierarchical structure, micro-nano technology, applied in nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problems of long reaction time, difficult to control KNN purity and particle size, etc., to increase surface potential and improve stability. Effect

Active Publication Date: 2021-05-04
TIANJIN CHENGJIAN UNIV
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the synthetic KNN is prepared by the hydrothermal method, intermediate compounds with different structures and compositions are formed at low temperatures, and these intermediate compounds undergo dissolution-precipitation into the desired perovskite structure at high temperatures, resulting in long reaction times and difficult control. The purity and particle size of KNN, in addition, the simple hydrothermal method also needs a very high alkaline solution (10mol / L) as a mineralizer when synthesizing these compounds, so the traditional hydrothermal method needs to be further improved

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A globulomer micro-nano hierarchical structure (k,na)nbo <sub>3</sub> Crystal and its preparation method
  • A globulomer micro-nano hierarchical structure (k,na)nbo <sub>3</sub> Crystal and its preparation method
  • A globulomer micro-nano hierarchical structure (k,na)nbo <sub>3</sub> Crystal and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Prepare a mixed solution with 45ml of distilled water and 30ml of isopropanol, then add 15.12g of KOH, 4.2g of NaOH, 3g of Nb 2 o 5 and 0.5wt% surfactant PEG, slowly stirred with a glass rod until the solute was completely dissolved, then placed it on a magnetic stirrer and stirred for 30min, then poured it into a hydrothermal kettle, and heated it at 200°C for 12h, 8000r / min centrifuged for 3min, then washed twice with distilled water and absolute ethanol, and dried in an oven at 60°C to obtain globulomer micro-nano hierarchical structure (K,Na)NbO 3 Crystal powder.

[0025] Depend on figure 1 It can be seen that (K,Na)NbO 3 It is a globular aggregate with a particle size of 8-10μm, which is formed by the aggregation of flake, block or irregular smooth particles with a thickness of 50nm-200nm and a thickness of 10-100nm.

[0026] Depend on figure 2 It can be seen that the (K,Na)NbO3 crystal of globular micro-nano hierarchical structure is perovskite type, withou...

Embodiment 2

[0029] Prepare a mixed solution with 45ml of distilled water and 30ml of isopropanol, then add 15.12g of KOH, 4.2g of NaOH, 3g of Nb 2 o 5 and 0.5wt% surfactant PVA, slowly stirred with a glass rod until the solute was completely dissolved, then placed it on a magnetic stirrer and stirred for 30min, then poured it into a hydrothermal kettle, and heated it at 200°C for 12h, 8000r / min centrifuged for 3min, then washed twice with distilled water and absolute ethanol, and dried in an oven at 60°C to obtain globulomer micro-nano hierarchical structure (K,Na)NbO 3 Crystal powder.

[0030] Depend on Figure 4 It can be seen that (K,Na)NbO 3 It is a globular aggregate with a particle size of 8-10 μm, which is formed by flaky aggregation with a diameter of 50nm and a thickness of 10nm. Compared with Example 1, the globular aggregate obtained under this condition is more regular, and the composition The layers of the sphere tend to blend together.

Embodiment 3

[0032] Prepare a mixed solution with 45ml of distilled water and 30ml of isopropanol, then add 15.12g of KOH, 4.2g of NaOH, 3g of Nb 2 o 5 and 0.5wt% surfactant CTAB, stir slowly with a glass rod until the solute is completely dissolved, then put it on a magnetic stirrer and stir for 30min, then pour it into a hydrothermal kettle, and heat it at 200°C for 12h, 8000r / min centrifuged for 3min, then washed twice with distilled water and absolute ethanol, and dried in an oven at 60°C to obtain globulomer micro-nano hierarchical structure (K,Na)NbO 3 Crystal powder.

[0033] Depend on Figure 5 It can be seen that (K,Na)NbO 3 It is a globular aggregate with a particle size of about 10 μm formed by flakes with a diameter of 50nm-100nm and a thickness of 10nm-50nm.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
diameteraaaaaaaaaa
thicknessaaaaaaaaaa
particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention discloses (K, Na)NbO with globular micro-nano hierarchical structure 3 Crystal and its preparation method, by adding isopropanol to the solvent to reduce the required mineralizer concentration, and at the same time adding a surfactant to increase the surface potential of the particles and improve the stability of the system, after 12 hours at a temperature of 200 ° C Synthesis of (K,Na)NbO with pure phase by hydrothermal reaction 3 Globules, and the crystals are micro-nano hierarchical structures of globomers, which are aggregated into globomers with a particle size of 10 μm from flakes with a diameter of 50-100 nm and a thickness of 10-50 nm. The (K,Na)NbO 3 The crystal has a perovskite structure and has important applications in generators, photocatalysis, etc. At the same time, this method provides a new idea for the surface classification modification of other particles.

Description

technical field [0001] The invention relates to the technical field of chemical material preparation, in particular to a globulomer micro-nano hierarchical structure (K,Na)NbO 3 Crystals and methods for their preparation. Background technique [0002] like (Zr,Ti)O 3 (PZT), Pb(Mg,Nb)O 3 -PbTiO 3 Such lead-based perovskite materials such as (PMN-PT) have been widely used in electronic devices such as sensors, actuators, and transducers for a long time. These materials contain more than 60% wt of toxic lead. During the preparation process, too high The temperature will trigger the volatilization of PbO, causing health and environmental problems. Therefore, the current research direction is to develop lead-free piezoelectric materials in which (K,Na)NbO in niobate 3 Lead-free piezoelectric ceramics are recognized as one of the main substitutes for PZT due to their excellent piezoelectric properties. [0003] The traditional solid-phase method is the most important method ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C01G33/00B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01G33/006C01P2002/34C01P2002/72C01P2002/85C01P2004/03C01P2004/64
Inventor 赵巍张琪荣嘉诚王虎刚李明晓
Owner TIANJIN CHENGJIAN UNIV