Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Photochemical Electrocyclic Reactions: Stereochemistry

Photochemical Electrocyclic Reactions: Stereochemistry

The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation

UV–Vis Spectroscopy: Molecular Electronic Transitions

UV–Vis Spectroscopy: Molecular Electronic Transitions

In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Gas-dependent plasma activation of a manganese MOF precatalyst tunes defect accessibility and reconstruction under alkaline HER conditions.

Materials advances·2026

Same author

Seed-mediated synthesis of NHC-stabilised Cu@Au core-shell nanoparticles from an NHC-Au(I) complex.

Nanoscale·2026

Same author

Aerobic Photodegradation of Pyrene-Based Metal-Organic Framework NU-1000 to Terephthalic Acid.

Chemistry of materials : a publication of the American Chemical Society·2026

Same author

Designing MOF-Thermogel Nanocomposites for Differential Multidrug Release in Combination Cancer Therapy.

ACS applied nano materials·2026

Same author

Design and fabrication of plasmonic hedgehog-shaped covalent organic framework nanocomposites for indirect SERS-based ultradetection of water contaminant terbutryn.

Nanoscale·2026

Same author

Zn(II)-Responsive Peptide Hydrogels with Tunable Mechanical Properties.

ACS omega·2026

Search research articles

Related Experiment Video

Updated: Jan 8, 2026

Patterning via Optical Saturable Transitions - Fabrication and Characterization

Patterning via Optical Saturable Transitions - Fabrication and Characterization

Published on: December 11, 2014

Hidden Structural Colors from Bistable, Electrically Driven Covalent Organic Framework Photonic Assemblies for Secure

Tolga Zorlu¹, Flora Schöfbeck^1,2, Julian Lemmel³

¹Department of Functional Materials and Catalysis, University of Vienna, 1090 Vienna, Austria.

|December 18, 2025

Summary

This summary is machine-generated.

This study presents a novel optical encryption method using reconfigurable covalent organic framework (COF) particles. This platform offers dynamic, electrically controlled data security with unique visual masking for advanced applications.

Keywords:

colloidal assemblies covalent-organic frameworks optical encoding photonic materials stimuli-responsive materials

More Related Videos

An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation

An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation

Published on: February 27, 2019

Blue-hazard-free Candlelight OLED

Blue-hazard-free Candlelight OLED

Published on: March 19, 2017

Related Experiment Videos

Last Updated: Jan 8, 2026

Patterning via Optical Saturable Transitions - Fabrication and Characterization

Patterning via Optical Saturable Transitions - Fabrication and Characterization

Published on: December 11, 2014

An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation

An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation

Published on: February 27, 2019

Blue-hazard-free Candlelight OLED

Blue-hazard-free Candlelight OLED

Published on: March 19, 2017

Area of Science:

Materials Science
Optics
Nanotechnology

Background:

Optical encryption is crucial for secure data transmission.
Nanostructured materials offer unique properties for advanced optical applications.
Existing methods face challenges in dynamic reconfigurability and robust security.

Purpose of the Study:

To develop an electrically reconfigurable colloidal photonic platform for dynamic and bistable optical data encryption.
To utilize covalent organic framework (COF) particles for secure data encoding.
To explore the use of nanoscale surface roughness for optical masking and security.

Main Methods:

Electrophoretic assembly of monodisperse COF particles in patterned cells.
Control of particle synthesis time to tune surface roughness and scattering properties.
Utilizing Bragg reflections and broadband scattering for conditional optical visibility under bright-field microscopy.

Main Results:

Demonstrated a dynamic and bistable optical encryption system based on COF particles.
Achieved data concealment from the naked eye using nanoscale surface roughness scattering.
Successfully transformed light scattering, typically a loss mechanism, into an optical masking feature.
Integrated electrical addressability, conditional visibility, and algorithmic decoding into a compact system.

Conclusions:

Colloidal COF dispersions are versatile photonic materials for secure displays and anticounterfeiting.
The developed platform offers a novel approach to multifactor optical encryption.
This technology has potential applications in adaptive optical communication and secure data encoding.