Related Experiment Video
Updated: Jan 26, 2026
07:14
In situ Photo-rheology Monitors Viscoelastic Changes in Photo-responsive Polymer Networks
Published on: June 20, 2025
887
A Cellulose/Laponite Interpenetrated Polymer Network (IPN) Hydrogel: Controllable Double-Network Structure with High
Fan Xie1,2, Cécile Boyer3,4,5, Victor Gaborit6
1Regenerative Medicine and Skeleton (RMeS), INSERM UMR_S1229, Université de Nantes, Centre Hospitalier Universitaire de Nantes, ONIRIS, F-44042 Nantes, France. fan_xie@huntsman.com.
Polymers
|April 11, 2019
Summary
This study developed a novel composite hydrogel using Laponite XLS™ and silanized hydroxypropylmethylcellulose (Si-HPMC) for tissue engineering. While enhancing mechanical properties, Laponite XLS™ exhibited cytotoxicity, requiring controlled internalization for safe biomaterial applications.
Area of Science:
- Materials Science
- Biomaterials Engineering
- Nanotechnology
Background:
- Silanized hydroxypropylmethylcellulose (Si-HPMC) hydrogels are promising biomaterials.
- Synthetic nanoclays like Laponite XLS™ offer tunable properties.
- Combining these materials could lead to advanced hydrogels for tissue engineering.
Purpose of the Study:
- To create and characterize a novel composite hydrogel from Si-HPMC and Laponite XLS™.
- To investigate the structural and mechanical enhancements provided by Laponite XLS™.
- To assess the suitability of the composite hydrogel for tissue engineering applications, including cytotoxicity.
Main Methods:
- Synthesis of Si-HPMC/Laponite XLS™ composite hydrogels using varied preparation protocols.
- Rheological measurements to determine storage modulus and viscoelastic properties.
- Confocal laser scanning microscopy (CLSM) with labeled Laponite XLS™ to visualize microstructure.
- Fluorescent microsphere tracking to analyze network dynamics.
- Cytotoxicity assays to evaluate material safety.
Main Results:
- Composite hydrogels exhibited a ten-fold increase in storage modulus compared to pure Si-HPMC hydrogel with 2 wt% Laponite XLS™.
- Evidence of co-existing chemical and physical network structures was observed.
- CLSM revealed two co-continuous areas: a dense red-light area and a loose dark area.
- Laponite XLS™ demonstrated cytotoxicity at low concentrations.
Conclusions:
- The hybrid interpenetrated network (IPN) hydrogel possesses a high modulus suitable for tissue engineering.
- The unique double-network structure enhances mechanical properties.
- Controlling the cellular internalization of Laponite XLS™ is crucial for safe application as a biomaterial.
Related Concept Videos
02:26Protein Networks
4.5K
An organism can have thousands of different proteins, and these proteins must cooperate to ensure the health of an organism. Proteins bind to other proteins and form complexes to carry out their functions. Many proteins interact with multiple other proteins creating a complex network of protein interactions.
These interactions can be represented through maps depicting protein-protein interaction networks, represented as nodes and edges. Nodes are circles that are representative of a protein,...
These interactions can be represented through maps depicting protein-protein interaction networks, represented as nodes and edges. Nodes are circles that are representative of a protein,...
4.5K
02:26Protein Networks
2.8K
2.8K
02:34Polymers
40.6K
The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
40.6K
02:18Network Covalent Solids
16.1K
Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
16.1K
01:25Network Function of a Circuit
681
Frequency response analysis in electrical circuits provides vital insights into a circuit's behavior as the frequency of the input signal changes. The transfer function, a mathematical tool, is instrumental in understanding this behavior. It defines the relationship between phasor output and input and comes in four types: voltage gain, current gain, transfer impedance, and transfer admittance. The critical components of the transfer function are the poles and zeros.
681
01:24Sequence Networks of Rotating Machines
489
A Y-connected synchronous generator, grounded through a neutral impedance, is designed to produce balanced internal phase voltages with only positive-sequence components. The generator's sequence networks include a source voltage that is exclusively in the positive-sequence network. The sequence components of line-to-ground voltages at the generator terminals illustrate this configuration.
Zero-sequence current induces a voltage drop across the generator's neutral impedance and other...
Zero-sequence current induces a voltage drop across the generator's neutral impedance and other...
489