The excellent mechanical properties of carbon nanotubes (CNTs) make them the ideal reinforcements... more The excellent mechanical properties of carbon nanotubes (CNTs) make them the ideal reinforcements for high performance composites. The misalignment and waviness of CNTs within composites are two major issues that limit the reinforcing efficiency. We report an effective method to increase the strength and stiffness of high volume fraction, aligned CNT composites by reducing CNT waviness using a drawing and stretching approach.
A simple method for processing high-performance carbon nanotube (CNT)/poly (vinyl alcohol)(PVA) c... more A simple method for processing high-performance carbon nanotube (CNT)/poly (vinyl alcohol)(PVA) composites by coupling the spraying of a PVA solution with the continuous winding of CNT sheets from an array onto a rotating mandrel is reported. This method allows the CNT composites to have a high CNT volume fraction, while having a high degree of alignment, long CNTs, and good integration with the matrix, which are extremely difficult to realize simultaneously by other processes.
Abstract A post-growth chemical vapor deposition (CVD) treatment was used to tune the compressive... more Abstract A post-growth chemical vapor deposition (CVD) treatment was used to tune the compressive mechanical properties of carbon nanotube (CNT) arrays. Millimeter tall CNT arrays with low compressive resilience were changed to a foam-like material with high compressive strength and almost complete recovery upon unloading. The foam was tuned to provide a range of compressive properties for various applications.
Conventional micro-fiber-reinforced composites provide insight into critical structural features ... more Conventional micro-fiber-reinforced composites provide insight into critical structural features needed for obtaining maximum composite strength and stiffness: the reinforcements should be long, well aligned in a unidirectional orientation, and should have a high reinforcement volume fraction. It has long been a challenge for researchers to process CNT composites with such structural features.
Abstract Wavy ribbons of carbon nanotubes (CNTs) are embedded in elastomeric substrates to fabric... more Abstract Wavy ribbons of carbon nanotubes (CNTs) are embedded in elastomeric substrates to fabricate stretchable conductors that exhibit excellent performance in terms of high stretchability and small resistance change. A CNT ribbon with a thin layer of sputtered Au/Pd film is transferred onto a prestrained poly (dimethylsiloxane)(PDMS) substrate and buckled out-of-plane upon release of the prestrain.
The excellent mechanical properties of carbon nanotubes (CNTs) make them the ideal reinforcements... more The excellent mechanical properties of carbon nanotubes (CNTs) make them the ideal reinforcements for high performance composites. The misalignment and waviness of CNTs within composites are two major issues that limit the reinforcing efficiency. We report an effective method to increase the strength and stiffness of high volume fraction, aligned CNT composites by reducing CNT waviness using a drawing and stretching approach.
A simple method for processing high-performance carbon nanotube (CNT)/poly (vinyl alcohol)(PVA) c... more A simple method for processing high-performance carbon nanotube (CNT)/poly (vinyl alcohol)(PVA) composites by coupling the spraying of a PVA solution with the continuous winding of CNT sheets from an array onto a rotating mandrel is reported. This method allows the CNT composites to have a high CNT volume fraction, while having a high degree of alignment, long CNTs, and good integration with the matrix, which are extremely difficult to realize simultaneously by other processes.
Abstract A post-growth chemical vapor deposition (CVD) treatment was used to tune the compressive... more Abstract A post-growth chemical vapor deposition (CVD) treatment was used to tune the compressive mechanical properties of carbon nanotube (CNT) arrays. Millimeter tall CNT arrays with low compressive resilience were changed to a foam-like material with high compressive strength and almost complete recovery upon unloading. The foam was tuned to provide a range of compressive properties for various applications.
Conventional micro-fiber-reinforced composites provide insight into critical structural features ... more Conventional micro-fiber-reinforced composites provide insight into critical structural features needed for obtaining maximum composite strength and stiffness: the reinforcements should be long, well aligned in a unidirectional orientation, and should have a high reinforcement volume fraction. It has long been a challenge for researchers to process CNT composites with such structural features.
Abstract Wavy ribbons of carbon nanotubes (CNTs) are embedded in elastomeric substrates to fabric... more Abstract Wavy ribbons of carbon nanotubes (CNTs) are embedded in elastomeric substrates to fabricate stretchable conductors that exhibit excellent performance in terms of high stretchability and small resistance change. A CNT ribbon with a thin layer of sputtered Au/Pd film is transferred onto a prestrained poly (dimethylsiloxane)(PDMS) substrate and buckled out-of-plane upon release of the prestrain.
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Papers by Xin Wang