Related Experiment Video
Updated: Jul 27, 2026
11:31
Preparation of Hydroxy-PAAm Hydrogels for Decoupling the Effects of Mechanotransduction Cues
Published on: August 28, 2014
13.3K
Ferroelectric hydrogels from amino acids and oleic acid
Erica Pensini1,2, Peter Meszaros1, Nour Kashlan1
1School of Engineering, University of Guelph, 50 Stone Road East, Guelph, ON N1G 2W1, Canada.
Iscience
|September 16, 2024
Summary
Researchers developed novel ferroelectric bio-based materials using amino acids and oleic acid. These highly hydrated gels exhibit piezoelectricity, enabling applications in medicine and clean energy harvesting.
Area of Science:
- Materials Science
- Biomaterials Engineering
- Physical Chemistry
Background:
- Developing ferroelectric bio-based materials with high water content (≈90 wt%) presents a significant challenge.
- Existing materials often lack the necessary hydration or specific functional groups for desired properties.
Purpose of the Study:
- To develop novel ferroelectric bio-based materials with high water content.
- To investigate the structural and electrical properties of these hydrogels.
- To explore their potential applications in medicine and energy harvesting.
Main Methods:
- Synthesis of hydrogels using amino acids (lysine, arginine) and oleic acid.
- Attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR) to analyze hydrogen bonding.
- Synchrotron small-angle X-ray scattering (SAXS) to determine crystal structure.
- Polarized light microscopy and shear rheology to characterize gel properties.
- Cyclic voltammetry to demonstrate piezoelectricity.
Main Results:
- Hydrogels with ≈90 wt% water content were successfully synthesized.
- ATR-FTIR confirmed hydrogen bonding between lysine's NH/CH groups and water, leading to electrically conductive solutions.
- SAXS revealed a lamellar crystal structure formed by lysine-oleic acid interactions.
- Polarized light microscopy and rheology identified birefringent gels with columnar hexagonal and bi-continuous sponge crystal structures.
- Cyclic voltammetry demonstrated piezoelectric behavior, with materials deforming and undergoing phase transitions under electric fields.
Conclusions:
- Novel ferroelectric bio-based hydrogels with high water content (up to 90 wt%) were developed.
- These materials exhibit piezoelectric properties due to their unique structure and composition.
- The developed piezoelectric materials hold promise for applications in medical devices and clean energy harvesting technologies.
More Related Videos
Related Concept Videos
02:30Water: A Bronsted-Lowry Acid and Base
The reaction between a Brønsted-Lowry acid and water is called acid ionization. For example, when hydrogen fluoride dissolves in water and ionizes, protons are transferred from hydrogen fluoride molecules to water molecules, yielding hydronium ions and fluoride ions:
02:54Ions as Acids and Bases
Salts with Acidic Ions
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
01:17Precipitation and Co-precipitation
Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
01:06Coagulation
Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
01:24Microbes and Other Elemental Cycles
Microbial activity plays a pivotal role in the biogeochemical cycling of iron and manganese, especially at the redox gradients characteristic of stratified aquatic environments. These cycles are driven by microbial transformations between oxidized and reduced forms of the metals, allowing organisms to exploit them for metabolic energy and structural purposes.Iron Cycling Across Redox GradientsIn neutral, oxygen-rich surface waters, iron is predominantly found in its oxidized, insoluble ferric...
01:19Acid Mine Drainage
Mining activities that disturb sulfide-rich rocks, particularly those containing pyrite (FeS₂), initiate a cascade of geochemical and microbiological processes with serious environmental implications. When exposed to air and water, pyrite undergoes oxidation, releasing sulfate, ultimately forming sulfuric acid and mobilizing heavy metals into surrounding water systems. This phenomenon, known as acid mine drainage (AMD), results in low pH waters laden with toxic elements that threaten aquatic...