Polyionic Nanoclays for Homogeneous Catalyst Support
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Solution Overview
Problem
Current methods for synthesizing supported ionic liquids (SILs) face challenges such as the need for pre-treatment of substrates, solvent compatibility issues, incomplete deposition leading to heterogeneous surfaces, and difficulties in separating and purifying the IL product, particularly for two-dimensional substrates which have more accessible and less size-restricted surface areas.
Innovation Solution
The development of functionalized organic-inorganic hybrid materials comprising atomically thin inorganic metal silicate clay nanosheets with covalently attached charged organic moieties and non-covalent counterions, allowing for the synthesis of polyionic nanoclays that can be used as catalyst supports and in separation applications, with methods involving the reaction of non-ionic silanes with nucleophiles to generate ionic organosilanes and subsequent metal salt treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If top-down methods are used to disperse ionic liquids onto porous substrates, then the synthesis process is simplified and both two-dimensional and three-dimensional supports can be accessed, but pre-treatment of the substrate is required, solvent compatibility limits material selection, heterogeneous surfaces result from incomplete IL deposition, and separation/purification of the IL product is difficult
Solution Approach 1:
The patent inverts the conventional top-down approach by using a bottom-up synthesis method. Instead of dispersing pre-formed ionic liquids onto substrates, the ionic liquid functional groups are incorporated during the formation of the nanoclay itself. This inversion eliminates the need for separate deposition steps and pre-treatment, while ensuring uniform distribution of ionic liquid functionalities throughout the material structure.
Solution Approach 2:
The patent performs preliminary action by incorporating the ionic liquid functional groups during the nanoclay synthesis process itself, rather than adding them afterward. The organic-inorganic hybrid nanoclays are formed with covalently bound ionic liquid functional groups integrated into the structure from the beginning, eliminating subsequent deposition and purification steps.
2Productivity
If two-dimensional substrates are used to increase accessible surface area and diffusion rates, then catalytic and separation application efficiency is improved, but the top-down methodology creates incomplete deposition and heterogeneous surfaces that reduce efficacy
Solution Approach 1:
The patent inverts the conventional approach by synthesizing two-dimensional nanoclay substrates with ionic liquid functional groups already integrated into their structure through bottom-up methodology. This ensures complete and uniform coverage of the two-dimensional surface area, maximizing accessible surface area and diffusion rates while maintaining homogeneous functional group distribution for optimal catalytic efficiency.
3Productivity
If ionic liquids are used as alternatives to traditional solvents for liquid-liquid separations and catalysis, then viscosity-related reaction rate retardation is reduced in nanofilm layers, but the need for separation and purification of excess IL and unmodified substrate remains
Solution Approach 1:
The patent merges the ionic liquid functional groups with the nanoclay substrate through covalent bonding to create an integrated organic-inorganic hybrid material. This combination eliminates the distinction between ionic liquid and substrate, allowing the material to function as a single unified catalyst support that requires no separation or purification steps while maintaining the high reaction rates characteristic of ionic liquids.
Solution Approach 2:
The patent creates a solid-supported copy of ionic liquid functionality by covalently binding ionic liquid functional groups to the nanoclay surface. This copying approach replicates the beneficial properties of ionic liquids (low viscosity, high ionic density) in a solid-supported format that is inherently easy to separate and purify, eliminating the need for complex purification procedures.
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
These hybrid materials enhance catalytic efficiency by stabilizing nanoparticles like gold nanoparticles, achieving rapid turnover frequencies and maintaining stability, while also providing effective separation capabilities due to their tailored surface chemistry and structure.
Implementation Method 1
reacting the ionic organosilane with a metal salt to form a functionalized organic-inorganic hybrid material
Implementation Method 2
enhance catalytic efficiency by stabilizing nanoparticles like gold nanoparticles
Implementation Method 3
an extremely high ionic density on the nanosheet surface
Data Source
AI summary
Disclosed herein are organic-inorganic hybrid materials, in particular polyionic nanoclays, along with methods of making and using the same. The functionalized organic-inorganic hybrid materials are preferably of a phyllosilicate structure and comprise an octahedral ionic layer sandwiched between two tetrahedral layers, one or more charged chemical moieties covalently bonded to the tetrahedral layers, and optionally one or more counterions or functional groups associated with the hybrid materials. Methods of producing the same, by contacting a silane with a nucleophile and hydrolyzing the product thereof in the presence of a metal salt, are also provided.