Article
Chemistry, Multidisciplinary
Arjun Menon, Peter W. Muenich, Pawel Wagner, David L. Officer, Dirk M. Guldi
Summary: The study describes a novel non-covalent electron donor-acceptor system involving metalloporphyrins and SWCNT, with microscopy and spectroscopy confirming efficient charge-transfer interactions. The fastest charge-separation and recombination dynamics were observed in 2-SWCNT, showing strong interactions and fast excited state decay.
Article
Materials Science, Multidisciplinary
Zakaria Saadi, Simon G. King, Jose Anguita, Vlad Stolojan, S. Ravi P. Silva
Summary: Thermoelectric materials offer a promising solution for recovering wasted energy, but their efficiency is low and the best materials are brittle, toxic, and expensive. This study demonstrates that flexible films of double-walled carbon nanotubes can achieve low thermal conductivity and high electrical conductivity, leading to the development of flexible, cheaper, and more efficient thermoelectric generators.
ENERGY & ENVIRONMENTAL MATERIALS
(2023)
Article
Electrochemistry
C. Barrientos, R. Moscoso, S. Moris, J. A. Squella
Summary: In this study, three new nitroaromatic compounds were synthesized and electrochemically studied on nanostructured electrodic platforms. It was found that these compounds were easily reducible, generating stable redox mediator couples.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Chemistry, Physical
Caiqin Gao, Mingyi Guo, Yukang Liu, Dingyue Zhang, Fan Gao, Ling Sun, Junshan Li, Xianchun Chen, Mauricio Terrones, Yanqing Wang
Summary: Carbon nanotubes (CNTs) have attracted significant interest as functional materials due to their exceptional mechanical, electrical, thermal, and photoelectric properties. However, the strong Van der Waals force causes CNTs to agglomerate into crystalline bundles, hindering their potential applications. Effective dispersion strategies, such as covalent and non-covalent functionalization, have been proposed to overcome this challenge and improve the self-assembling characteristics of CNTs. Non-covalent modifications, including electrostatic interaction, 7C-7C stacking interaction, dipole interactions, Van der Waals interactions, hydrogen bond, and coordination, are particularly attractive for CNTs dispersion without disturbing their internal electronic structure.
Article
Chemistry, Physical
Andres Felipe Quintero-Jaime, Alessio Ghisolfi, Diego Cazorla-Amoros, Emilia Morallon
Summary: Covalent functionalization of MWCNTs and oMWCNTs with Ph2PCl was studied by cyclic voltammetry, resulting in different levels of phosphorus incorporation depending on the upper potential limit used, with simultaneous observation of chlorine incorporation.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Construction & Building Technology
Laura Silvestro, Artur Spat Ruviaro, Paulo Ricardo de Matos, Fernando Pelisser, Daniela Zambelli Mezalira, Philippe Jean Paul Gleize
Summary: This study investigated the functionalization of carbon nanotubes (CNT) with 3-aminopropyltriethoxysilane (APTES) for application in cementitious nanocomposites. The results showed that APTES effectively functionalized the CNT, leading to significant improvements in mechanical performance when incorporated into the cementitious matrix.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Chemistry, Analytical
Michael Lopez Mujica, Ilania Sotomayor-Santander, Patricio Hermosilla-Ibanez, Felipe Oyarzun-Ampuero, Marcela C. Rodriguez, Gustavo A. Rivas, Diego Venegas-Yazigi, Soledad Bollo
Summary: The study presents a hybrid material of POMAF and MWCNTs for amperometric quantification of hydrogen peroxide at glassy carbon electrodes. The material shows good linear range, detection limit, and successful application in enriched milk samples.
Article
Chemistry, Physical
Gabrielle B. Novais, Mariana A. Dias, Adilson A. M. Santana, Thigna C. Batista, Maria N. Marques, Carlisson R. Melo, Ricardo L. C. Albuquerque Junior, Margarete Z. Gomes, Patricia Severino, Eliana B. Souto, Juliana C. Cardoso
Summary: This work focuses on the functionalization of SWCNTs and MWCNTs with two selected isoflavones and compares their physicochemical properties. Acidic treatment improved the dispersibility of both types of nanotubes, but SWCNTs still remained aggregated. However, MWCNTs showed increased dispersibility after acidic treatment. The functionalization with isoflavones was confirmed by improved dispersibility of the nanotubes.
JOURNAL OF MOLECULAR STRUCTURE
(2023)
Article
Chemistry, Multidisciplinary
Silvia Aidee Solorio-Rodriguez, Andrew Williams, Sarah Sos Poulsen, Kristina Bram Knudsen, Keld Alstrup Jensen, Per Axel Clausen, Pernille Hogh Danielsen, Hakan Wallin, Ulla Vogel, Sabina Halappanavar
Summary: This study aimed to determine the influence of single or multi-walled structures and surface functionalization on pulmonary toxicity of carbon nanotubes (CNTs) and to identify the underlying mechanisms. Mice were exposed to different doses of SWCNTs or MWCNTs, and inflammation and DNA damage were assessed. Transcriptomics analysis showed similar responses across all CNTs, with inflammation, cellular stress, metabolism, and DNA damage responses being affected. One pristine SWCNT was found to be the most potent and potentially fibrogenic, warranting further toxicity testing.
Article
Chemistry, Multidisciplinary
Yui Konno, Rina Morooka, Tatsunari Morishita, Pei Zhao, Naoto Miyasaka, Kazuki Ono, Akira Noda, Daiki Uchida, Ren Iwasaki, Michio Yamada, Masahiro Ehara, Yutaka Maeda
Summary: Functionalization of single-walled carbon nanotubes (SWNTs) using a series of bromoalkanes and dibromoalkanes with different tether lengths was investigated. Longer tether lengths (six or more) resulted in SWNT adducts with two new photoluminescence (PL) peaks, while shorter tether lengths (3-5) produced single peaks. The formation mechanism of functionalized adducts was found to be influenced by the tether length, with shorter tethers tending to produce kinetic products.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Environmental Sciences
Miaomiao Tan, Longfei Liu, Deyun Li, Chengliang Li
Summary: The transport behavior of multi-walled carbon nanotubes with different surface modifications in water-saturated sand columns was influenced by pH and ionic strength, with COOH-MWCNTs exhibiting the strongest mobility.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Physics, Applied
Meenu Sharma, Ravi Bhatia, I Sameera
Summary: The conductivity behavior of multiwall carbon nanotube (MWCNT)/poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) composites has been investigated under temperature and magnetic field. By adjusting the loading of MWCNTs, the charge transport can be tuned from insulating to metallic regime. The temperature dependent conductivity shows different power law dependence in different temperature regimes, and the magnetoconductance is influenced by weak localization and electron-electron interactions.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Engineering, Environmental
Mirtha A. O. Lourenco, Marco Fontana, Pravin Jagdale, Candido Fabrizio Pirri, Sergio Bocchini
Summary: In this study, multi-walled carbon nanotubes with different functionalities were chemically modified with N1-(3-trimethoxysilylpropyl)diethylenetriamine (DETASi) to enhance CO2 adsorption/separation properties. Among the functionalized samples, COOH-modified MWCNT showed the highest CO2 adsorption capacity after DETASi modification. Additionally, the selectivity for CO2/N2 separation was improved after DETASi grafting reaction.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Materials Science, Composites
Nasim Jan Mohammadi Dashtaki, Amir Hossein Nassajpour-Esfahani, Morteza Bayareh, Pouya Rezai, Ali Doostmohammadi
Summary: The study found that the properties of nanocomposites were dependent on the concentration of CNTs. Nanocomposites fabricated in a quasi-AC electric field showed more uniform and non-agglomerated characteristics. With 1 wt% of CNT, the nanocomposite exhibited suitable electrical conductivity and mechanical properties for microfluidic devices.
JOURNAL OF COMPOSITE MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Duan-Chao Wang, Hou-Yong Yu, Zhaofeng Ouyang, Dongming Qi, Ying Zhou, Anqi Ju, Ziheng Li, Yiwen Cao
Summary: In this study, composite fibers with chain-ring structures were prepared by connecting cellulose nanofiber (CNF) and multi-walled carbon nanotubes (MWCNT) covalently, solving the problems of MWCNT aerogel formation and phase separation during compounding. The resulting aerogels exhibited mechanical resilience and chain-ring fibers, enabling high compression resistance and application in flexible supercapacitors and sensors.
Article
Chemistry, Applied
Qingyuan Zheng, Jack H. Williams, Scott Elgersma, Mick D. Mantle, Andrew J. Sederman, G. Leendert Bezemer, Constant M. Guedon, Lynn F. Gladden
Summary: In this study, a pilot-scale fixed-bed reactor compatible with NMR/MRI was developed for Fischer-Tropsch synthesis. Multiple magnetic resonance techniques were applied to quantitatively characterize different product species within catalyst pellets, providing valuable information for catalyst and reactor optimization.
Article
Chemistry, Applied
Lisa Ramisch, Sebastian Pfaff, Sabrina M. Gericke, Edvin Lundgren, Johan Zetterberg
Summary: We present a combination of optical operando techniques that allow simultaneous measurement of adsorbed species on catalyst surfaces, monitoring of surface oxide formation, and imaging of the gas phase above the catalyst surface. The experimental setup was validated by studying CO oxidation on Pd(100) at different pressures, revealing the effects of pressure on the heterogeneous catalytic reaction.
Article
Chemistry, Applied
Marta Paniagua, Gabriel Morales, Juan A. Melero, Daniel Garcia-Salgado
Summary: The influence of common impurities in levulinic acid on the catalytic performance of different acid catalysts for bio-jet fuel production was studied. It was found that furfural had the greatest detrimental effect on catalyst performance, while propyl-sulfonic acid-modified SBA-15 and sulfonic acid resin Amberlyst-70 showed good regeneration ability.
Article
Chemistry, Applied
Jesus Tapiador, Pedro Leo, Guillermo Calleja, Gisela Orcajo
Summary: This study presents a new MOF material, Zn-URJC-13, with acid and basic sites, permanent porosity, and high affinity to CO2 molecules. The Zn-URJC-13 catalyst exhibits efficient performance in CO2 cycloaddition reactions and can be reused multiple times.
Article
Chemistry, Applied
Dan Zhao, Vita A. Kondratenko, Dmitry E. Doronkin, Shanlei Han, Jan-Dierk Grunwaldt, Uwe Rodemerck, David Linke, Evgenii V. Kondratenko
Summary: This study demonstrates the potential of cheap and commercially available Zr or Ti-based supports and ZnO to serve as active and selective catalysts for propane dehydrogenation (PDH). The catalytically active species formed in situ under PDH conditions consist of isolated ZnOx. ZnOx on the surface of LaZrOx shows the highest rate of propene formation.
Article
Chemistry, Applied
Hanbyeol Kim, Jung Rae Kim, Young-Kwon Park, Jeong-Myeong Ha, Jungho Jae
Summary: In this study, metal phosphates were used as catalysts for biomass conversion to produce sustainable aromatics through DielsAlder cycloaddition reactions. The effects of synthesis method, activation method, and P/Ti molar ratio on the structure and acid properties of titanium phosphate catalysts were systematically studied. The mesoporous titanium phosphate catalyst synthesized by hydrothermal method at 180℃ for 12 h followed by ethanol refluxing at 60℃ for 24 h at a molar P/Ti ratio of 1 showed the highest surface area and acid site density.
Article
Chemistry, Applied
Yasin Khani, Sumin Pyo, Kwang-Eun Jeong, Chul-Ung Kim, Moonis Ali Khan, Byong-Hun Jeon, Kun-Yi Andrew Lin, Siyoung Q. Choi, Young-Kwon Park
Summary: A protonated form of Zeolite Socony Mobil-5 (H-ZSM-5) catalyst was synthesized through a hydrothermal method using different sources of silica. The effect of loading the catalyst with yttrium, samarium, and gadolinium on the acidic properties was investigated. Among the metal-loaded catalysts, the Sm/LHZ catalyst showed the best performance in the methanol to propylene conversion due to its high amount of weak and intermediate acid sites, while the Gd-LHZ catalyst increased the selectivity towards ethane and propane.
Article
Chemistry, Applied
Michael Franc, Ivana Cisarova, Jan Vesely
Summary: The present study investigates an enantioselective cyclization of enals with imidazolone derivatives catalyzed by a combination of achiral Pd(0) complex and chiral secondary amine. Corresponding spirocyclic imidazolones were produced in high yields with moderate diastereoselectivity and excellent enantioselectivity. The developed co-operative catalytic methodology provides a highly substituted spirocyclic scaffold with four stereogenic centers under mild conditions.
Article
Chemistry, Applied
Mauro Alvarez, Jennifer Cueto, David P. Serrano, Pablo Marin, Salvador Ordonez
Summary: This study focuses on improving the formulation and preparation methods of catalysts for the production of dimethyl carbonate. By using suitable catalyst preparation methods and copper salt precursors, the researchers successfully produced catalysts with optimal performance for dimethyl carbonate formation.
Article
Chemistry, Applied
Claudia J. Keijzer, Luc C. J. Smulders, Dennie Wezendonk, Jan Willem de Rijk, Petra E. de Jongh
Summary: This study investigates the catalytic behavior of alpha-alumina supported silver catalysts in the presence of chloride. It is found that the particle size of silver can affect the selectivity of the catalyst, but different strategies lead to different results. In this size range, the selectivity of ethylene oxide is correlated to the Ag : Al2O3 surface ratio.
Article
Chemistry, Applied
Takeshi Aihara, Wataru Aoki, Michikazu Hara, Keigo Kamata
Summary: The development of acid-base bifunctional catalysts is important for promoting specific chemical transformations. In this study, Ti-based perovskite oxides were synthesized and used as catalysts for two C-C bond-forming reactions (cyanosilylation and Knoevenagel condensation). The highly pure SrTiO3 nanoparticles with a high specific surface area exhibited the highest catalytic performance, and could be easily recovered and reused.
Article
Chemistry, Applied
Olga Gorlova, Petra Pribylova, Eliska Vyskocilova, Katerina Peroutkova, Jan Kohout, Iva Paterova
Summary: This study investigates the Baeyer-Villiger oxidation of beta-cyclocitral using tin-modified mixed oxides as catalysts. The optimal reaction conditions and the effects of various factors on the reaction course and selectivity were determined. The results show that tin-modified mixed oxides exhibit high activity and selectivity in the oxidation reaction.
Article
Chemistry, Applied
M. I. Avila, M. M. Alonso-Doncel, L. Briones, G. Gomez-Pozuelo, J. M. Escola, D. P. Serrano, A. Peral, J. A. Botas
Summary: The catalytic fast pyrolysis of lignin using ion-exchanged zeolite catalysts showed significant improvements in bio-oil quality and the production of aromatic hydrocarbons and oxygenated compounds.
Article
Chemistry, Applied
Enrico Catizzone, Giorgia Ferrarelli, Paolo Bruno, Girolamo Giordano, Massimo Migliori
Summary: The acid-catalysed alcohol conversion reaction is a promising route for de-fossilization strategies. Research on pure alcohol conversion and simultaneous dehydration of mixed alcohols have shown different product compositions, with the type and distribution of acid sites affecting the reaction mechanism.
Article
Chemistry, Applied
Alireza Ranjbari, Juho Kim, Jihee Yu, Jiyun Kim, Mireu Park, Nayoung Kim, Kristof Demeestere, Philippe M. Heynderickx
Summary: This study investigated a novel kinetic model for the adsorption and photocatalytic degradation of methyl orange using commercial ZnO and reduced ZnO photocatalysts. The results provided new insights into the interaction of catalysts with molecules of different charges and compared with a previous study on methylene blue. The presence of oxygen vacancies in ZnO and their effects on adsorption and photocatalytic degradation were analyzed, and the photocatalytic degradation rate of reduced ZnO was found to increase significantly.
