Ankoma Anderson | Anderson University (South Carolina) (original) (raw)
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Papers by Ankoma Anderson
Herein, we report research centered on the use of single walled carbon nanotubes (SWNTs) for thei... more Herein, we report research centered on the use of single walled carbon nanotubes (SWNTs) for their electrical conductivity (EC) , or more specifically the harvesting of metallic-SWNTs for their extremely high EC, and on the exploitation of carbon and boron nitride nano-fillers for polymeric composites of high thermal conductivity (TC). SWNTs as produced are a mixture of both metallic and semiconducting components , which are distinctively different in electrical conductivity and many other aspects. Thus post-production separation of -SWNTs from their mixtures in the as-produced samples is necessary. As a result, my dissertation is formatted as such: the first chapter is a detailed review of Metallic Single Walled Carbon Nanotubes for electrically conductive materials and devices; the second chapter is primarily focused on the separation of SWNTs into their respective metallic and semiconducting components using non-covalent functionalization and solubilization. The method exploits t...
ChemPhysChem, 2015
Hexagonal boron nitride nanosheets (BNNs) are analogous to their two-dimensional carbon counterpa... more Hexagonal boron nitride nanosheets (BNNs) are analogous to their two-dimensional carbon counterparts in many materials properties, in particular, ultrahigh thermal conductivity, but also offer some unique attributes, including being electrically insulating, high thermal stability, chemical and oxidation resistance, low color, and high mechanical strength. Significant recent advances in the production of BNNs, understanding of their properties, and the development of polymeric nanocomposites with BNNs for thermally conductive yet electrically insulating materials and systems are highlighted herein. Major opportunities and challenges for further studies in this rapidly advancing field are also discussed.
Nanotechnology Reviews, 2012
Polymeric nanocomposite materials that are highly thermally conductive are important to a variety... more Polymeric nanocomposite materials that are highly thermally conductive are important to a variety of applications, with examples ranging from flexible radiators in space to high-performance aircrafts and vehicles and to cutting-edge electronics. Among widely used nanoscale fillers in the development of these materials are carbon nanotubes and graphene sheets. As concluded in previous reviews, the performance of carbon nanotubes for imparting high thermal conductivity into polymeric matrices was generally poor. Here recent results associated with the effort on significant performance improvements are reviewed as an update. By contrast, graphene sheets have emerged as effective nanoscale fillers for polymeric nanocomposites of excellent thermal transport performance, reaching levels that are competitive to those achieved by metals. The significant recent results on thermally conductive polymeric nanocomposites with graphene sheets are highlighted, and their potential applications and ...
The Journal of Physical Chemistry C, 2012
As-produced single-walled carbon nanotubes (SWNTs) are mostly metallic and semiconducting mixture... more As-produced single-walled carbon nanotubes (SWNTs) are mostly metallic and semiconducting mixtures. The population of semiconducting SWNTs in the as-produced mixtures is generally much higher than that of their metallic counterparts. Therefore, postproduction separation of metallic and semiconducting SWNTs is important to many potential uses of the nanotubes, especially those demanding higher electrical conductivity yet lower optical absorption. Because planar aromatic species are known to have ...
Angewandte Chemie International Edition, 2012
Аннотация. Проект закона о нормативных правовых актах является предметом обсуждения научной общес... more Аннотация. Проект закона о нормативных правовых актах является предметом обсуждения научной общественности, политиков, других заинтересованных лиц. В статье дается анализ основных положений проекта закона «О нормативных правовых актах в Российской Федерации» на предмет закрепления в нем обобщений судебной практики и правоприменения, научных разработок и потребностей правотворческой деятельности. При подготовке статьи использовались количественные и качественные способы, а также исторический и специальноюридический методы исследований. Разработка проекта закона Минюстом России дает возможность надеяться на принятие закона, что будет способствовать стабилизации правовой системы, законодательства и правотворчества. Необходимо качественное совершенствование проекта на стадии его обсуждения до официального внесения в законодательный орган: уточнение определения нормативного правового акта, видов документов, субъектов правотворчества, систематизации, ответственности правотворческих органов.
The Journal of Supercritical Fluids, 2012
In the preparation of graphene sheets for various studies and applications, the indirect route th... more In the preparation of graphene sheets for various studies and applications, the indirect route through the reduction of graphene oxides (GOs) has been widely pursued. Exfoliated GOs are shown to be mostly single-layer sheets in aqueous solution, and they are also demonstrated for conversion to recover some of the properties intrinsic to graphene. Beyond the commonly used thermal annealing and chemical reduction methods, several environmentally friendly conversion strategies have been explored in the literature. ...
Journal of Materials Science: Materials in Electronics
The Journal of Physical Chemistry C, May 16, 2011
Pyrene has been a popular molecular structure in the noncovalent functionalization of single-wall... more Pyrene has been a popular molecular structure in the noncovalent functionalization of single-walled carbon nanotubes (SWNTs), and the selectivity between metallic and semiconducting SWNTs for the underlying interactions has been exploited for the postproduction metallic–semiconducting nanotube separation. Two pyrene derivatives, 1-pyreneacetic acid (PyAA) and 1-docosyloxylmethylpyrene (DomP), which are hydrophilic and hydrophobic, respectively, were evaluated on their noncovalent interactions with ...
ACS applied materials & interfaces, Jan 10, 2014
Graphene is known for high thermal and electrical conductivities. In the preparation of neat carb... more Graphene is known for high thermal and electrical conductivities. In the preparation of neat carbon materials based on graphene, a common approach has been the use of well-exfoliated graphene oxides (GOs) as the precursor, followed by conversion to reduced GOs (rGOs). However, rGOs are more suitable for the targeted high electrical conductivity achievable through percolation but considerably less effective in terms of efficient thermal transport dictated by phonon progression. In this work, neat carbon films were fabricated directly from few-layer graphene sheets, avoiding rGOs completely. These essentially graphene-graphene composites were of a metal-like appearance and mechanically flexible, exhibiting superior thermal and electrical transport properties. The observed thermal and electrical conductivities are higher than 220 W/m · K and 85000 S/m, respectively. Some issues in the further development of these mechanically flexible graphene-graphene nanocomposite materials are discu...
RSC Nanoscience & Nanotechnology, 2013
Herein, we report research centered on the use of single walled carbon nanotubes (SWNTs) for thei... more Herein, we report research centered on the use of single walled carbon nanotubes (SWNTs) for their electrical conductivity (EC) , or more specifically the harvesting of metallic-SWNTs for their extremely high EC, and on the exploitation of carbon and boron nitride nano-fillers for polymeric composites of high thermal conductivity (TC). SWNTs as produced are a mixture of both metallic and semiconducting components , which are distinctively different in electrical conductivity and many other aspects. Thus post-production separation of -SWNTs from their mixtures in the as-produced samples is necessary. As a result, my dissertation is formatted as such: the first chapter is a detailed review of Metallic Single Walled Carbon Nanotubes for electrically conductive materials and devices; the second chapter is primarily focused on the separation of SWNTs into their respective metallic and semiconducting components using non-covalent functionalization and solubilization. The method exploits t...
ChemPhysChem, 2015
Hexagonal boron nitride nanosheets (BNNs) are analogous to their two-dimensional carbon counterpa... more Hexagonal boron nitride nanosheets (BNNs) are analogous to their two-dimensional carbon counterparts in many materials properties, in particular, ultrahigh thermal conductivity, but also offer some unique attributes, including being electrically insulating, high thermal stability, chemical and oxidation resistance, low color, and high mechanical strength. Significant recent advances in the production of BNNs, understanding of their properties, and the development of polymeric nanocomposites with BNNs for thermally conductive yet electrically insulating materials and systems are highlighted herein. Major opportunities and challenges for further studies in this rapidly advancing field are also discussed.
Nanotechnology Reviews, 2012
Polymeric nanocomposite materials that are highly thermally conductive are important to a variety... more Polymeric nanocomposite materials that are highly thermally conductive are important to a variety of applications, with examples ranging from flexible radiators in space to high-performance aircrafts and vehicles and to cutting-edge electronics. Among widely used nanoscale fillers in the development of these materials are carbon nanotubes and graphene sheets. As concluded in previous reviews, the performance of carbon nanotubes for imparting high thermal conductivity into polymeric matrices was generally poor. Here recent results associated with the effort on significant performance improvements are reviewed as an update. By contrast, graphene sheets have emerged as effective nanoscale fillers for polymeric nanocomposites of excellent thermal transport performance, reaching levels that are competitive to those achieved by metals. The significant recent results on thermally conductive polymeric nanocomposites with graphene sheets are highlighted, and their potential applications and ...
The Journal of Physical Chemistry C, 2012
As-produced single-walled carbon nanotubes (SWNTs) are mostly metallic and semiconducting mixture... more As-produced single-walled carbon nanotubes (SWNTs) are mostly metallic and semiconducting mixtures. The population of semiconducting SWNTs in the as-produced mixtures is generally much higher than that of their metallic counterparts. Therefore, postproduction separation of metallic and semiconducting SWNTs is important to many potential uses of the nanotubes, especially those demanding higher electrical conductivity yet lower optical absorption. Because planar aromatic species are known to have ...
Angewandte Chemie International Edition, 2012
Аннотация. Проект закона о нормативных правовых актах является предметом обсуждения научной общес... more Аннотация. Проект закона о нормативных правовых актах является предметом обсуждения научной общественности, политиков, других заинтересованных лиц. В статье дается анализ основных положений проекта закона «О нормативных правовых актах в Российской Федерации» на предмет закрепления в нем обобщений судебной практики и правоприменения, научных разработок и потребностей правотворческой деятельности. При подготовке статьи использовались количественные и качественные способы, а также исторический и специальноюридический методы исследований. Разработка проекта закона Минюстом России дает возможность надеяться на принятие закона, что будет способствовать стабилизации правовой системы, законодательства и правотворчества. Необходимо качественное совершенствование проекта на стадии его обсуждения до официального внесения в законодательный орган: уточнение определения нормативного правового акта, видов документов, субъектов правотворчества, систематизации, ответственности правотворческих органов.
The Journal of Supercritical Fluids, 2012
In the preparation of graphene sheets for various studies and applications, the indirect route th... more In the preparation of graphene sheets for various studies and applications, the indirect route through the reduction of graphene oxides (GOs) has been widely pursued. Exfoliated GOs are shown to be mostly single-layer sheets in aqueous solution, and they are also demonstrated for conversion to recover some of the properties intrinsic to graphene. Beyond the commonly used thermal annealing and chemical reduction methods, several environmentally friendly conversion strategies have been explored in the literature. ...
Journal of Materials Science: Materials in Electronics
The Journal of Physical Chemistry C, May 16, 2011
Pyrene has been a popular molecular structure in the noncovalent functionalization of single-wall... more Pyrene has been a popular molecular structure in the noncovalent functionalization of single-walled carbon nanotubes (SWNTs), and the selectivity between metallic and semiconducting SWNTs for the underlying interactions has been exploited for the postproduction metallic–semiconducting nanotube separation. Two pyrene derivatives, 1-pyreneacetic acid (PyAA) and 1-docosyloxylmethylpyrene (DomP), which are hydrophilic and hydrophobic, respectively, were evaluated on their noncovalent interactions with ...
ACS applied materials & interfaces, Jan 10, 2014
Graphene is known for high thermal and electrical conductivities. In the preparation of neat carb... more Graphene is known for high thermal and electrical conductivities. In the preparation of neat carbon materials based on graphene, a common approach has been the use of well-exfoliated graphene oxides (GOs) as the precursor, followed by conversion to reduced GOs (rGOs). However, rGOs are more suitable for the targeted high electrical conductivity achievable through percolation but considerably less effective in terms of efficient thermal transport dictated by phonon progression. In this work, neat carbon films were fabricated directly from few-layer graphene sheets, avoiding rGOs completely. These essentially graphene-graphene composites were of a metal-like appearance and mechanically flexible, exhibiting superior thermal and electrical transport properties. The observed thermal and electrical conductivities are higher than 220 W/m · K and 85000 S/m, respectively. Some issues in the further development of these mechanically flexible graphene-graphene nanocomposite materials are discu...
RSC Nanoscience & Nanotechnology, 2013