Self-Assembled Living Crystals via Light-Driven Particle Dynamics

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Solution Overview

Problem

Current technologies fail to effectively harness non-equilibrium driving forces for the self-assembly of synthetic photo-activated colloidal particles into dynamic, two-dimensional 'living crystals' that can form, break, and reform, while also controlling their structure and stability.

Innovation Solution

The use of self-propelled particles with attractive interactions induced by osmotic and phoretic effects, triggered by light, allows for the formation of 'living crystals' that can be stabilized and steered using external magnetic fields, enabling controlled assembly and disassembly.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If non-equilibrium driving forces are applied to propel particles, then particle mobility and dynamic assembly are improved, but structure stability and control are worsened

Engineering Contradiction:

Improveparticle mobilityVSAvoidstructure stability

Core Design Contradiction:

SpeedVSStability of the object's composition

Solution Approach 1:

The system transitions from static equilibrium structures to dynamic non-equilibrium assemblies where particles are continuously propelled and reorganize. The living crystals form and dissolve dynamically under light activation, allowing the system to adapt its structure while maintaining stability through continuous energy input rather than static balance

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes the fundamental parameter of particle interaction from passive attractive forces to active self-propelled motion with controlled attractive interactions. By adjusting light intensity and particle concentration, the system can tune between mobile individual particles and stable crystalline assemblies, resolving the contradiction between mobility and stability

Inventive Principle:

Principle #35Parameter changes

2Stability of the object's composition

If attractive interactions are introduced between particles, then structure formation is improved, but system complexity and control difficulty are worsened

Engineering Contradiction:

Improvestructure formationVSAvoidsystem complexity

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

Light acts as an intermediary that mediates the attractive interactions between particles. The photo-activated colloidal particles use light-induced osmotic and phoretic effects to generate controlled attraction, allowing structure formation without direct complex particle-particle interaction mechanisms

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The system replaces complex mechanical control mechanisms with optical control. Instead of using mechanical fields or direct contact control to manage particle assembly, the patent uses light fields to activate and control attractive interactions, simplifying the control interface while enabling precise structure formation

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Adaptability or versatility

If particles are self-propelled within the medium, then assembly dynamics and reversibility are improved, but energy consumption and system control are worsened

Engineering Contradiction:

Improveassembly reversibilityVSAvoidenergy consumption

Core Design Contradiction:

Adaptability or versatilityVSUse of energy by moving object

Solution Approach 1:

The system uses periodic light activation to drive reversible assembly processes. By switching light on and off, the particles can be propelled to form assemblies and then return to dispersed states, enabling reversible control without continuous energy consumption. The periodic action allows the system to achieve adaptability through cyclic energy input rather than constant energy expenditure

Inventive Principle:

Principle #19Periodic action

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 approach results in dynamic assemblies that exhibit transitions from normal to giant fluctuations, allowing for the creation of stable and reversible 'living crystals' with controlled dynamics, opening new avenues for novel structure design and production.

Implementation Method 1

attractive interactions induced by osmotic and phoretic effects, triggered by light

Methodology Applied

Scientific EffectOsmotic effect: Osmosis

Implementation Method 2

attractive interactions induced by osmotic and phoretic effects, triggered by light

Methodology Applied

Scientific EffectPhoresis: Photophoresis

Implementation Method 3

stabilized and steered using external magnetic fields

Methodology Applied

Scientific EffectMagnetic field effect: Magnetic Field

Data Source

PatentUS9821294B2Self assembled particles

Publication Date: 2017.11.21 NEW YORK UNIV

AI summary

A self-assembling structure using non-equilibrium driving forces leading to “living crystals” and other maniputable particles with a complex dynamics. The dynamic self-assembly assembly results from a competition between self-propulsion of particles and an attractive interaction between the particles. As a result of non-equilibrium driving forces, the crystals form, grow, collide, anneal, repair themselves and spontaneously self-destruct, thereby enabling reconfiguration and assembly to achieve a desired property.