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Superplasticizers

Superplasticizers

Superplasticizers are advanced admixtures that enhance the workability of concrete by lowering the water content without compromising the strength of the material. These substances are highly effective water reducers, improving concrete flow, making it easier to work with, and enabling concrete to reach inaccessible areas or densely reinforced sections without mechanical vibration. The key components in superplasticizers are either sulfonated melamine or naphthalene formaldehyde condensates,...

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Related Experiment Video

Updated: Jan 8, 2026

Functionalization of Single-walled Carbon Nanotubes with Thermo-reversible Block Copolymers and Characterization by Small-angle Neutron Scattering

Functionalization of Single-walled Carbon Nanotubes with Thermo-reversible Block Copolymers and Characterization by Small-angle Neutron Scattering

Published on: June 1, 2016

Superplastic carbon nanotubes.

J Y Huang¹, S Chen, Z Q Wang

¹Department of Physics, Boston College, Boston, Massachusetts 02467, USA. huangje@bc.edu

|January 20, 2006

Summary

This summary is machine-generated.

Individual single-walled carbon nanotubes exhibit superplastic deformation at high temperatures, elongating significantly before breaking. This discovery could enhance the properties of advanced materials like ceramics and nanocomposites.

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Last Updated: Jan 8, 2026

Functionalization of Single-walled Carbon Nanotubes with Thermo-reversible Block Copolymers and Characterization by Small-angle Neutron Scattering

Functionalization of Single-walled Carbon Nanotubes with Thermo-reversible Block Copolymers and Characterization by Small-angle Neutron Scattering

Published on: June 1, 2016

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Fabrication, Densification, and Replica Molding of 3D Carbon Nanotube Microstructures

Fabrication, Densification, and Replica Molding of 3D Carbon Nanotube Microstructures

Published on: July 2, 2012

Area of Science:

Materials Science
Nanotechnology
Mechanical Engineering

Background:

Single-walled carbon nanotubes (SWCNTs) possess a theoretical maximum tensile strain of approximately 20%, but practical applications are limited by lower achieved elongations (around 6%).
Understanding the deformation mechanisms of SWCNTs is crucial for their integration into advanced materials.

Purpose of the Study:

To investigate the deformation behavior of individual SWCNTs at high temperatures.
To explore the potential for enhanced mechanical properties in materials utilizing SWCNTs.

Main Methods:

High-temperature tensile testing of individual single-walled carbon nanotubes.
Microscopic analysis to observe deformation mechanisms.

Main Results:

Individual SWCNTs demonstrated superplastic deformation at high temperatures, achieving elongations of up to 280%.
During superplastic deformation, SWCNTs became approximately 15 times narrower.
The observed superplasticity is attributed to the nucleation and movement of structural kinks within the nanotube.

Conclusions:

High temperatures enable superplastic deformation in SWCNTs, significantly exceeding previously observed limits.
The superplasticity mechanism involving kinks offers a pathway to improve the strength and toughness of ceramics and nanocomposites.
This finding has significant implications for the development of high-performance materials for demanding applications.