Skein-Shaped Aluminosilicate for HPLC Separation
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Solution Overview
Problem
Current commercialized zeolites are limited in their pore size, structure, acidity, and hydrothermal stability, which restricts their application and requires the development of new morphologies and framework structures to enhance specific surface area and separation abilities.
Innovation Solution
An aluminosilicate structure body with a novel crystal structure and a skein-shaped morphology is developed, characterized by a specific chemical formula and X-ray diffraction pattern, and prepared through a method involving the quick addition of an aqueous sodium silicate solution to an aqueous sodium aluminate solution, followed by hydrothermal treatment with a seed having a skein-shaped morphology.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional zeolite structures (LTA, FAU, MFI, etc.) are used, then hydrothermal stability is maintained, but specific surface area and separation ability are limited
Solution Approach 1:
The invention segments the zeolite crystal structure into smaller nanoscale domains (5-50 μm particle size with internal porosity) while maintaining the overall framework stability. This segmentation increases the external surface area and creates multiple access pathways to active sites, thereby improving both specific surface area and separation ability simultaneously
Solution Approach 2:
The invention implements a nested structure where hierarchical porosity is created with micro-pores nested within meso-pores, which are nested within the macro-scale crystal framework. This nested architecture allows molecules to access internal active sites through multiple pore size levels, enhancing separation ability while the overall structure maintains hydrothermal stability
2Adaptability or versatility
If new zeolite structures are developed to improve separation ability, then pore properties are enhanced, but structural stability and acidity control become more difficult
Solution Approach 1:
The invention applies local quality by introducing specific aluminum species (six-coordinate Al, five-coordinate Al, four-coordinate Al) at different local positions within the zeolite framework. Each aluminum species provides different acidity and catalytic properties, allowing optimization of separation ability at specific sites while the overall framework maintains structural stability through the proven LTA topology
Solution Approach 2:
The invention utilizes parameter changes by controlling the Si/Al ratio (1.0 Al2O3:10.0 to 60.0 SiO2) and the coordination number of aluminum atoms to tune the acidity and pore properties. These parameter adjustments enable optimization of separation ability for specific applications while maintaining hydrothermal stability through the robust LTA framework structure
3Reliability
If silica gel is used as stationary phase, then pH stability is limited, but the structure is simple and well-established
Solution Approach 1:
The invention creates a composite material system by combining the stable LTA zeolite framework with controlled aluminum species distribution and hierarchical pore structures. This composite approach integrates the hydrothermal stability of conventional zeolites with enhanced pH resistance and improved separation ability, overcoming the limitations of simple silica gel while maintaining structural coherence
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 aluminosilicate structure body exhibits an increased specific surface area up to 300 m2/g, improved separation ability, and enhanced pH stability, allowing it to be used effectively as a stationary phase in HPLC columns across a wider range of pH conditions than conventional silica gel.
Implementation Method 1
preparing a reaction mother solution having a viscosity of 3.1 to 7.1 mPas by quickly adding an aqueous sodium silicate solution prepared by reacting an aqueous sodium hydroxide solution and a silica source to an aqueous sodium aluminate solution prepared by reacting an aqueous sodium hydroxide solution and an alumina source
Implementation Method 2
crystallizing a novel aluminosilicate structure body having a skein-shaped morphology by performing a hydrothermal treatment on the synthetic mixture
Data Source
AI summary
The present inventive concept relates to an aluminosilicate structure body with a novel crystal structure and, more specifically, to an aluminosilicate structure body having a novel crystal structure and a skein-shaped morphology, a method for preparing the same, and an HPLC column filled with the same as a stationary phase. The aluminosilicate structure body according to the present inventive concept has a novel crystal structure and a skein-shaped morphology, and thus has a specific surface area increased to up to 300 m2/g so as to improve separation ability; and does not undergo a structural change with pH changes, and thus can be usefully used in a wider range of pH conditions than existing silica gel which has been conventionally used as a stationary phase for HPLC columns.