Hydrangea-Shaped Layered Double Hydroxide for High Surface Area Delivery
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Solution Overview
Problem
Existing methods for preparing layered double hydroxides do not effectively provide a large specific surface area, limiting the efficient delivery and stability of functional cosmetic ingredients.
Innovation Solution
A co-precipitation method is used to prepare hydrangea-shaped layered double hydroxides by adding a mixed solution of divalent and trivalent metal cations with NaOH to an anion solution at pH 9 to 11, followed by filtration, washing, and drying to achieve a large specific surface area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional preparation methods are used for layered double hydroxide, then the preparation process is simple, but the specific surface area is small
Solution Approach 1:
The invention changes key preparation parameters including maintaining pH at 9-11 during co-precipitation, using specific molar ratios of divalent to trivalent metal cations (2:1), and controlling the addition rate of NaOH solution. These parameter changes transform the conventional preparation method into one that produces hydrangea-shaped LDH with large specific surface area (200 m²/g or more) while keeping the process manageable.
Solution Approach 2:
The invention uses a composite approach by combining divalent metal cations (Mg²⁺, Ca²⁺, Zn²⁺) with trivalent metal cations (Al³⁺, Fe³⁺, Cr³⁺) in specific ratios to form layered double hydroxide with enhanced properties. The composite structure of mixed metal cations in the hydroxide layers creates the unique hydrangea-shaped morphology and large surface area.
2Productivity
If the specific surface area of layered double hydroxide is increased, then the delivery efficiency of cosmetic ingredients is improved, but the preparation difficulty increases
Solution Approach 1:
The invention performs preliminary actions by pre-mixing divalent and trivalent metal cations in the desired 2:1 molar ratio before adding the anion solution. The pH is pre-adjusted to 9-11 range, and NaOH solution is prepared at specific concentration (0.5-5 M) before the co-precipitation process. This preliminary preparation simplifies the main reaction step and ensures consistent hydrangea-shaped particle formation with high surface area.
Solution Approach 2:
The invention uses pH control as an intermediary parameter to mediate between the metal cation solution and anion solution during co-precipitation. By maintaining pH at 9-11 using NaOH as a mediator, the process achieves controlled formation of hydrangea-shaped LDH particles with large surface area, making the preparation more manageable despite the complexity of forming such structures.
3Area of stationary object
If co-precipitation method with pH control is used, then hydrangea-shaped particles with large surface area are formed, but the process time increases
Solution Approach 1:
The invention employs periodic action by controlling the addition of NaOH solution in a regulated manner during co-precipitation. The pH is maintained at 9-11 through controlled, periodic addition rather than all-at-once addition, which allows gradual formation of hydrangea-shaped particles with large surface area while managing the overall process time efficiently.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method results in a hydrangea-shaped layered double hydroxide with a BET surface area of 200 m²/g or more, enabling efficient and stable delivery of cosmetic active ingredients.
Implementation Method 1
a co-precipitation method in which a mixed solution of a solution comprising a divalent metal cation and a solution comprising a trivalent metal cation, and a NaOH solution are added to a solution comprising an anion while maintaining pH at 9 to 11
Implementation Method 2
adding a mixed solution of a solution comprising a divalent metal cation and a solution comprising a trivalent metal cation, and a NaOH solution are added to a solution comprising an anion while maintaining pH at 9 to 11
Implementation Method 3
filtering the resultant obtained in step (ii) through a Buchner funnel and washing with distilled water until pH reaches 6 to 8
Implementation Method 4
filtering the resultant obtained in step (iv) through a Buchner funnel and drying
Data Source
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Figure 7~8
AI summary
The present invention relates to a method for preparing hydrangea-shaped layered double hydroxide and, more specifically, to a method for preparing hydrangea-shaped layered double hydroxide having a wide specific surface area by a co-precipitation method in which a NaOH solution and a mixed solution of a solution containing divalent metal cations and a solution containing trivalent metal cations are added to a solution containing anions, maintaining the pH at 9 to 11.