Carbon nanotubes (CNTs) hold the promise of delivering exceptional mechanical properties and multi-functional characteristics. Ever-increasing interest in applying CNTs in many different fields has led to continued efforts to develop dispersion and functionalization techniques. To employ CNTs as effective reinforcement in polymer nanocomposites, proper dispersion and appropriate interfacial adhesion between the CNTs and polymer matrix have to be guaranteed. This paper reviews the current understanding of CNTs and CNT/polymer nanocomposites with two particular topics: (i) the principles and techniques for CNT dispersion and functionalization and (ii) the effects of CNT dispersion and functionalization on the properties of CNT/polymer nanocomposites. The fabrication techniques and potential applications of CNT/polymer nanocomposites are also highlighted.

Dispersion and functionalization of carbon nanotubes for polymer-based nanocomposites: a review

In this study, the mechanical properties of epoxy nanocomposites with graphene platelets, single-walled carbon nanotubes, and multi-walled carbon nanotube additives were compared at a nanofiller weight fraction of 0.1 ± 0.002%. The mechanical properties measured were the Young’s modulus, ultimate tensile strength, fracture toughness, fracture energy, and the material’s resistance to fatigue crack propagation. The results indicate that graphene platelets significantly out-perform carbon nanotube additives. The Young’s modulus of the graphene nanocomposite was ∼31% greater than the pristine epoxy as compared to ∼3% increase for single-walled carbon nanotubes. The tensile strength of the baseline epoxy was enhanced by ∼40% with graphene platelets compared to ∼14% improvement for multi-walled carbon nanotubes. The mode I fracture toughness of the nanocomposite with graphene platelets showed ∼53% increase over the epoxy compared to ∼20% improvement for multi-walled carbon nanotubes. The fatigue resistance resu...

Enhanced mechanical properties of nanocomposites at low graphene content.

In this article, several applications of nanomaterials in food packaging and food safety are reviewed, including: polymer/clay nanocomposites as high barrier packaging materials, silver nanoparticles as potent antimicrobial agents, and nanosensors and nanomaterial-based assays for the detection of food-relevant analytes (gasses, small organic molecules and food-borne pathogens). In addition to covering the technical aspects of these topics, the current commercial status and understanding of health implications of these technologies are also discussed. These applications were chosen because they do not involve direct addition of nanoparticles to consumed foods, and thus are more likely to be marketed to the public in the short term.

Applications of nanotechnology in food packaging and food safety: Barrier materials, antimicrobials and sensors

https://www.alice.cnptia.embrapa.br/bitstream/doc/579864/1/PA09005.pdf

Nanocomposites for food packaging applications

A review of recent research on mechanics of multifunctional composite materials and structures

Interfacial damping characteristics of carbon nanotube-based composites

The overall objective of this research is to create a new actuation system, emulating the ability of plants to generate large strains while carrying significant structural loads. Specifically, the authors aim to create high-authority active structures by exploring a revolutionary combination of two innovative ideas inspired by the mechanical, chemical, and electrical properties of the plants. The first idea, inspired by the fibrillar network in plant cell walls, is to create a high-mechanical-advantage actuator structure based on flexible matrix composites (FMCs). Through fiber—matrix tailoring of FMC tubes, one can cause the structure to actuate in certain desired directions when pressurized. Second, the actuator concept is combined with a novel electroosmotic (EO) transport mechanism to regulate pressure inside the FMC tube, inspired by the ion-transport and volume-control phenomena in plant cells. By adjusting the applied voltage across a charged porous membrane, one can control the internal pressure a...

Kaifeng Wang

Papers

Interfacial damping characteristics of carbon nanotube-based composites

Fibrillar network adaptive structure with ion-transport actuation

Measuring forming limit strains with digital image correlation analysis

Characterization of weld attributes in ultrasonic welding of short carbon fiber reinforced thermoplastic composites

Variable stiffness adaptive structures utilizing hydraulically pressurized flexible matrix composites with valve control