Zeolite L Host-Guest Loading via Cyclic Siloxane Infiltration
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Solution Overview
Problem
Current methods for loading zeolite L crystals with guest molecules, such as dyes, are inefficient and costly due to the use of vacuum ampoules and organic solvents that can decompose dyes and occupy space within the channels, making it difficult to achieve high loading efficiency and scalability.
Innovation Solution
A method involving a composition of cyclic siloxanes and zeolite L crystals, where the cyclic siloxane dissolves and transports guest molecules into the zeolite channels at elevated temperatures, avoiding the need for vacuum ampoules and reducing loading time, allowing for efficient and fast production of zeolite L host-guest materials on a large scale.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If vacuum ampoule method is used to insert dye molecules into zeolite L channels, then dye loading can be achieved, but the process is very time-consuming (24-72 hours) and has low insertion efficiency
Solution Approach 1:
The patent changes the physical and chemical parameters of the insertion process by using cyclic siloxane as a solvent medium and applying elevated temperatures (100-300°C). This transforms the slow vacuum diffusion process into a fast solution-phase infiltration process, reducing insertion time from 24-72 hours to just 1-24 hours while significantly increasing dye loading efficiency
Solution Approach 2:
The patent introduces cyclic siloxane as an intermediary solvent that facilitates dye molecule transport into zeolite L channels. The cyclic siloxane dissolves the dye molecules and enables their efficient penetration into the channels at elevated temperatures, acting as a mediator that overcomes the slow diffusion limitation of the vacuum method
2Ease of manufacture
If organic solvents such as ethanol or methanol are used during insertion, then the process is simpler, but the solvents occupy large space within channels and prevent dyes from entering
Solution Approach 1:
The patent selects cyclic siloxane with specific molecular size and chemical properties that allow it to temporarily occupy channels during insertion but be completely removable afterward. The elevated temperature processing enables the cyclic siloxane to volatilize completely, leaving no residual occupation of channel space, thus achieving both ease of manufacture and high dye loading efficiency
3Ease of manufacture
If organic solvents are present during high temperature insertion, then handling is easier, but the solvents cause decomposition of organic dyes
Solution Approach 1:
The patent uses cyclic siloxane as a temporary, disposable solvent that serves its purpose during insertion and then completely volatilizes at processing temperatures (100-300°C), leaving no harmful residues. This disposable solvent approach enables easy process handling while maintaining dye stability, as the cyclic siloxane decomposes harmlessly rather than causing dye degradation
4Quantity of substance
If vacuum ampoule method is used, then dye insertion can be achieved, but only small quantities (few hundred mg) can be produced
Solution Approach 1:
The patent transitions from the confined one-dimensional vacuum ampoule environment to a three-dimensional open system using cyclic siloxane as a bulk solvent. This dimensional change allows simultaneous processing of large quantities of zeolite L crystals and dye molecules, enabling scalable production from hundred-milligram to kilogram-scale while maintaining high insertion efficiency
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
This method enables the rapid and cost-effective production of zeolite L crystals hosting guest molecules with high loading efficiency, facilitating the creation of strongly luminescent materials and scalable production.
Implementation Method 1
cyclic siloxanes can dissolve at least partly the at least one type of guest molecules at the insertion temperature
Implementation Method 2
transports the at least partly solubilized guest molecule to the opening of the zeolite L channels which then absorb the guest molecule
Implementation Method 3
the at least partly solubilized guest molecule to the opening of the zeolite L channels which then absorb the guest molecule
Implementation Method 4
heating the composition obtained in step a) to at least 100° C. to incorporate the guest molecules in the channels of the zeolite L crystals
Data Source
AI summary
A method for preparing a zeolite L host-guest material hosting at least one type of guest molecule including the steps of: a) obtaining a composition including at least one cyclic siloxane and a mixture of guest molecules and zeolite L crystals having straight through channels, and b) heating the composition obtained in step a) to at least 100° C. to incorporate the organic guest molecules in the channels of the zeolite L crystals.