Silver Ion Stabilized DNA Colloidal Crystal Lattice
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
DNA-mediated colloidal crystals are sensitive to environmental conditions such as salt concentration, solvent, and temperature, requiring embedding in a matrix for stability, limiting their applications.
Innovation Solution
Admixing a colloidal crystal with a silver ion source to form a stabilized colloidal crystal, where nucleic acid surface-functionalized nanoparticles are arranged in a lattice pattern, resulting in improved stability in various environments, including water, organic solvents, and high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If colloidal crystals are held together by nucleic acid linkages, then the crystal structure can be engineered with controlled composition and lattice parameters, but the stability of the crystal deteriorates under environmental variations such as salt concentration, solvent, and temperature
Solution Approach 1:
The patent applies parameter changes by introducing silver ions to alter the binding characteristics of nucleic acid linkages. The silver ions coordinate with the nucleic acid molecules, strengthening the inter-particle bonds and reducing the sensitivity to environmental parameters such as salt concentration and temperature. This allows the crystal to maintain its engineered lattice parameters while achieving improved stability under varying conditions.
Solution Approach 2:
The patent creates a composite structure by combining colloidal particles with nucleic acid linkages and silver ion cross-links. This multi-component system integrates the self-assembly capability of nucleic acid-mediated crystallization with the enhanced stability provided by metal ion coordination, resulting in a composite material that exhibits both precise lattice control and environmental robustness.
2Reliability
If colloidal crystals are embedded in a matrix to improve stability, then the crystal structure gains environmental stability, but the complexity of the system increases and manipulation becomes more difficult
Solution Approach 1:
The patent extracts the stabilizing function from the matrix embedding approach and transfers it to the inter-particle linkages themselves. By incorporating silver ions into the nucleic acid linkages, the stability is built into the crystal structure at the molecular level, eliminating the need for an external matrix and simplifying the overall system while maintaining environmental stability.
3Reliability
If silver ions are introduced to strengthen nucleic acid linkages, then the crystal stability improves, but the lattice parameter decreases by at least 15%
Solution Approach 1:
The patent accepts the lattice parameter contraction as an inherent consequence of the silver ion cross-linking mechanism. The coordination of silver ions with nucleic acid bases reduces the effective length of the linkages, causing the observed 15% or greater reduction in lattice parameters. This parameter change is traded for significant improvements in crystal stability and environmental robustness.
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 stabilized colloidal crystals exhibit enhanced stability, maintaining lattice structure and symmetry across a wide range of conditions, allowing for manipulation and study in previously incompatible media without the need for a stabilizing matrix.
Implementation Method 1
admixing a colloidal crystal with a silver ion source to form a stabilized colloidal crystal, wherein the colloidal crystal comprises nanoparticles modified on the nanoparticle surface with nucleic acids ('anchor strands')
Data Source
AI summary
A post-synthetic method for stabilizing colloidal crystals programmed from nucleic acid is disclosed herein. In some embodiments, the method relies on Ag+ ions to stabilize the particle-connecting nucleic acid duplexes within the crystal lattice, essentially transforming them from loosely bound structures to ones with very strong interparticle links. In some embodiments, the nucleic acid is DNA. Such crystals do not dissociate as a function of temperature like normal DNA or DNA-interconnected colloidal crystals, and they can be moved from water to organic media or the solid state, and stay intact. The Ag+-stabilization of the nucleic acid (e.g., DNA) bonds is accompanied by a nondestructive contraction of the lattice, and both the stabilization and contraction are reversible with the chemical extraction of the Ag+ ions, e.g., by AgCl precipitation with NaCl.