Advanced Three-Dimensional Structural Carbon Nanomaterials.
Degree: PhD, Engineering, 2016, Rice University
Carbon nanomaterials, such as carbon nanotubes (CNTs) and graphene, are
most intensively investigated carbon allotropes because of their outstanding
physical and chemical properties. Recently, it has been realized that threedimensional
(3D) carbon-based structures with nanoscale interconnection provide
the remarkably improved properties required for critically needed applications. The
properties of 3D-CNTs and graphene architectures can be tweaked for various
applications. Therefore, 3D carbon-based solids with nanoscale intermolecular
junctions present an exciting research area and provide opportunities for
fabrication of various 3D-macroscopic architectures with unexpected properties.
The creation of nanoengineered 3D-macroscopic structures in a scalable synthetic
process still remains a challenge. The fundamental problem is the difficulty in
introducing atomic-scale junctions between individual nanoscale structures so that
they can be organized as covalently interconnected nanostructured networks with
controllable physical characteristics, such as density and porosity. Here, 3D
structures have been created using chemical vapor deposition method, solutionbased
chemistry technique and welding method via hypervelocity impact method to
generate atomic-scale junction between carbon nanostructures.
The scalable fabrication of 3D macroscopic scaffolds with different
hierarchical interconnected structures and soldering-like junctions between CNTs
using chemical vapor deposition (CVD) technique is reported. These intermolecular
junctions of CNTs result in a high thermal stability, high electrical conductivity,
excellent mechanical properties, as well as excellent structural stability in a
concentrated acid, base, and organic solvents. The CNT solids with such tremendous
properties represent the next generation of carbon-based materials with a broad
range of potential applications; we demonstrate here a couple such utility impact
damping, removal oil from contaminated water and as a marker for the oil industry.
Additionally, in situ nano-indentation inside a scanning electron microscopy (SEM)
were used to determine the mechanical response of individual covalent junction,
formed in different configurations such as “X”, “Y” and “” shapes between
individual CNTs. Fully atomistic reactive molecular dynamics simulations are used
to support the experimental results as well as to study the deformation behavior of
Vertically aligned multiwall carbon nanotube forests (NTF) synthesized by
water assisted CVD method and both sides functionalized with different
functionalities as hydrophobic and hydrophilic. The produced hygroscopic nanotube
forest demonstrate for water harvesting from air.
The second approach has been used in this work is solution chemistry to generate
crosslinking nanotube structures. The scalable synthesis of 3D macroscopic solids made
of covalently connected nanotubes via Suzuki cross-coupling reaction, a well-known
carbon-carbon covalent bond forming reaction in organic chemistry. The resulting CNTs…
Advisors/Committee Members: Ajayan, Pulickel M. (advisor).
Subjects/Keywords: Nanotubes; Carbon; Three-Dimensional; Mechanical properties; Water harvesting; Functionalization; Unzipping; High impact; Unzipping Mechanism; Stiffness; Intermolecular junctions; 3D CNT solids; Carbon nanotube junction; picoindentation; in situ testing; atomistic modeling; oil-water separation; chemical cross-linking; Suzuki reaction
to Zotero / EndNote / Reference
APA (6th Edition):
Ozden, S. (2016). Advanced Three-Dimensional Structural Carbon Nanomaterials. (Doctoral Dissertation). Rice University. Retrieved from http://hdl.handle.net/1911/95520
Chicago Manual of Style (16th Edition):
Ozden, Sehmus. “Advanced Three-Dimensional Structural Carbon Nanomaterials.” 2016. Doctoral Dissertation, Rice University. Accessed September 19, 2019.
MLA Handbook (7th Edition):
Ozden, Sehmus. “Advanced Three-Dimensional Structural Carbon Nanomaterials.” 2016. Web. 19 Sep 2019.
Ozden S. Advanced Three-Dimensional Structural Carbon Nanomaterials. [Internet] [Doctoral dissertation]. Rice University; 2016. [cited 2019 Sep 19].
Available from: http://hdl.handle.net/1911/95520.
Council of Science Editors:
Ozden S. Advanced Three-Dimensional Structural Carbon Nanomaterials. [Doctoral Dissertation]. Rice University; 2016. Available from: http://hdl.handle.net/1911/95520