Article
Chemistry, Physical
Paula Mayorga-Burrezo, Carmen C. Mayorga-Martinez, Martin Pumera
Summary: Micromachines have been functionalized with magnetic components to achieve efficient magnetic microrobots with photodegradation activity for environmental pollutant decomposition. The influence of photocatalyst on the micromotors' trajectory in conjunction with magnetic motion was investigated. The light-induced reactive oxygen species (ROS) power the microrobots and have a strong influence on magnetic trajectories, resulting in an unexpected alteration of their motion direction. These dual magnetic/photocatalytic microrobots showed great potential for catalytic applications in various fields.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Chemistry, Physical
Igor Fokin, Kai-Thorben Kuessner, Inke Siewert
Summary: This article introduces a method that combines organometallic catalysis and electrochemistry for the electrohydrogenation of ketones and aldehydes. Mechanistic analysis shows that by using a manganese catalyst and a proton relay, electrohydrogenation of C=O bonds can be achieved with high selectivity. The method demonstrates catalytic efficiency and high conversion rate under mild conditions.
Article
Chemistry, Physical
Behdad Aghelnejad, Geoffrey Bodenhausen, Philippe Pelupessy
Summary: Diffusion processes can be directly followed by recording one-dimensional images of a selected slice at different time intervals. The resulting diffusion coefficients of H2O and DMSO are consistent with earlier studies obtained by monitoring NMR signal attenuation as a function of gradient amplitude in gradient echo sequences.
Article
Nanoscience & Nanotechnology
Jessica Ann O'Callaghan, Daeyeon Lee, Daniel A. Hammer
Summary: This study demonstrates the generation of enzyme-powered microcapsules using droplet microfluidics. By functionalizing the surfaces of the microcapsules with enzyme urease, their motion can be actively driven. The research also explores the role of different surfactants and surface roughness in enhancing the motion of these microcapsules.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Review
Physics, Condensed Matter
Subhadip Ghosh, Ambika Somasundar, Ayusman Sen
Summary: Enzymes play a crucial role in supporting life by performing essential tasks through energy released from chemical reactions. Studies have shown that enzyme motion at low Reynolds numbers remains at the epicenter of life. Understanding the mechanisms of enzyme motion is important for designing biomimetic systems and molecular machines.
ANNUAL REVIEW OF CONDENSED MATTER PHYSICS, VOL 12, 2021
(2021)
Review
Chemistry, Inorganic & Nuclear
Nathan Davison, Erli Lu
Summary: Organo-alkali metal reagents are important tools in synthetic chemistry, and their aggregation behavior and structure-reactivity relationship have been extensively studied. This Perspective focuses on the strategies employed to isolate low aggregates and monomeric complexes of common alkali metal alkyls. The relationship between aggregation level, structure, and reactivity is also discussed.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Multidisciplinary
Morgane Valles, Silvia Pujals, Lorenzo Albertazzi, Samuel Sanchez
Summary: This study evaluated the purity of a commercial urease used for powering micro- and nanomotors and found it to be impure. Purification of the urease improved the motility of the micromotors, indicating the importance of protein purity for optimal performance of enzyme-powered motors.
Article
Chemistry, Physical
Juan F. van der Maelen, Javier Ruiz
Summary: DFT theoretical calculations were performed to investigate the Ag2O-induced isomerization process of diaminocarbenes to formamidines coordinated to Mn(I). The results revealed that the reaction mechanism involves the metalation of the N-H residue of the carbene ligand by Ag2O catalyst and the formation of a key transition state with mu-eta(2):eta(2) coordination between the formamidinyl ligand and manganese-silver. In contrast, calculations with Cu2O catalyst showed a similar reaction mechanism that is thermodynamically feasible but kinetically unfavorable, consistent with experimental observations.
Article
Chemistry, Multidisciplinary
Linda Feuerstein, Carl Georg Biermann, Zuyao Xiao, Christian Holm, Juliane Simmchen
Summary: The study expands the range of suitable reactions for micromotors by exploring galvanic exchange processes, resulting in a highly efficient new type of active motility. An electrokinetic model is proposed to better understand the underlying processes involved in micromotor propulsion.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Chemistry, Physical
Yinping Wang, Yannick Coppel, Juliette Fitremann, Stephane Massou, Christophe Mingotaud, Myrtil L. Kahn
Summary: Shaping nanomaterials for electronic devices and batteries requires the formulation of a moldable material that includes these nanomaterials. Organomineral gels, which form a gel without a binder, are a promising option as they do not dilute the properties of the nanomaterial. This study focuses on organometallic gels based on a [ZnCy2] precursor and a primary alkyl amine, exploring the parameters controlling gel properties. The experiments show that gelation time depends on the alkyl chain length of the amine, and that the rigidification of the amine's aliphatic chains has a greater influence on gelation mechanism than the oligomerization of the inorganic backbone.
Article
Chemistry, Analytical
Eric Ruzicka, Perry Pellechia, Brian C. Benicewicz
Summary: Diffusion-ordered spectroscopy (DOSY) 1H nuclear magnetic resonance (NMR) is a powerful tool for characterizing the molecular weights of polymers. Compared to common techniques, DOSY is faster and more cost-effective, and does not require purified samples. The study emphasizes the importance of proper preparation in generating calibration curves, including selecting the correct pulse sequence, optimizing parameters, and sample preparation. It also highlights the increasing significance of incorporating DOSY NMR into the polymer chemist's toolbox.
ANALYTICAL CHEMISTRY
(2023)
Article
Chemistry, Physical
Enping Lin, Zhemin Bai, Yifei Yuan, Zhiwei Chen, Yu Yang, Yuqing Huang, Zhong Chen
Summary: Multidimensional NMR spectroscopy is a powerful tool for structure elucidation and dynamic analysis of complex samples, particularly biological macromolecules. However, the reconstruction of Laplace-related NMR, which involves relaxation or diffusion detection, presents challenges due to its ill-posed property. Existing reconstruction methods for Laplace-related NMR sparse sampling suffer from poor resolution and possible artifacts, highlighting the need for more effective optimization algorithms.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Multidisciplinary
L. Wang, Y. Huang, H. Xu, S. Chen, H. Chen, Y. Lin, X. Wang, X. Liu, S. Sanchez, X. Huang
Summary: This study develops laccase-powered Fe3O4@silica nanomotors assisted by lipase enzyme for enhanced degradation of multiple pollutants. The nanomotors showed increased Brownian motion and catalytic efficiency, leading to efficient degradation of contaminants. The lipase-assisted laccase nanomotors outperformed other nanomotors in terms of catalytic stability and degradation efficiency.
MATERIALS TODAY CHEMISTRY
(2022)
Article
Mechanics
Ke Qin, Zonghao Zou, Lailai Zhu, On Shun Pak
Summary: The use of machine learning techniques in developing microscopic swimmers has gained significant attention. Reinforcement learning has been proven useful in enabling swimmers to learn effective propulsion strategies through interactions with the surroundings. In this study, a reinforcement learning approach is applied to identify swimming gaits of a multi-link model swimmer, showing its potential in both classical and new swimming gaits at low Reynolds numbers.
Article
Engineering, Marine
Cihad Celik, Devrim Bulent Danisman
Summary: This study predicts the powering performance of a semi-displacement ship, both without and with a Hull Vane (HV). The effect of the HV on the propulsion performance is investigated and a practical method is proposed as an engineering application to reduce the computation time. The study shows that HV not only decreases effective power by 11.41% but also increases the propulsive efficiency by 2.1%, which reduces the brake power by 14.61% in total at service speed.
Article
Engineering, Chemical
Teng Li, Ping Jin, Yekai Zhang, Kexin Huang, Jingen Long, Jun Jiang, Shengqin Liu, Ayusman Sen, Weiran Yang
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2020)
Article
Chemistry, Inorganic & Nuclear
Janine Contro, Alex S. Paula, Vinicius Litrenta Medeiros, Ariano D. Rodrigues, Carlos Pacheco, Jose G. Nery
INORGANIC CHEMISTRY COMMUNICATIONS
(2020)
Article
Chemistry, Organic
Lee J. Silverberg, Carlos Pacheco, Debashish Sahu, Peter Scholl, Hany F. Sobhi, Joshua T. Bachert, Kaitlyn Bandholz, Ryan V. Bendinsky, Heather G. Bradley, Baylee K. Colburn, David J. Coyle, Jonathon R. Dahl, Megan Felty, Ryan F. Fox, Kyanna M. Gonzalez, Jasra M. Islam, Stacy E. Koperna, Quentin J. Moyer, Duncan J. Noble, Melissa E. Ramirez, Ziwei Yang
JOURNAL OF HETEROCYCLIC CHEMISTRY
(2020)
Article
Ecology
Arunima Sen, Alena Didriksen, Stephane Hourdez, Mette Marianne Svenning, Tine L. Rasmussen
ECOLOGY AND EVOLUTION
(2020)
Article
Chemistry, Multidisciplinary
Greg D. Barber, Christy George, Kathryn Hogg, Shae T. Johnstone, Carlos N. Pacheco, Hemant P. Yennawar, William G. Van Der Sluys
Article
Geosciences, Multidisciplinary
Wei-Li Hong, Pauline Latour, Simone Sauer, Arunima Sen, William P. Gilhooly, Aivo Lepland, Fotios Fouskas
GEO-MARINE LETTERS
(2020)
Article
Chemistry, Multidisciplinary
Yunwen Zhou, Yanyu Mu, Ming-Feng Hsieh, Bernd Kabius, Carlos Pacheco, Carol Bator, Robert M. Rioux, Jeffrey D. Rimer
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2020)
Article
Chemistry, Physical
Jonathan S. Casey, Julien H. Arrizabalaga, Mohammad Abu-Laban, Jeffrey C. Becca, Benjamin J. Rose, Kevin T. Strickland, Jacob B. Bursavich, Jacob S. McCann, Carlos N. Pacheco, Lasse Jensen, Anilchandra Attaluri, Daniel J. Hayes
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2020)
Article
Chemistry, Multidisciplinary
Joshua E. Kauffman, Abhrajit Laskar, Oleg E. Shklyaev, Anna C. Balazs, Ayusman Sen
Review
Environmental Sciences
Emmelie K. L. Astrom, Arunima Sen, Michael L. Carroll, JoLynn Carroll
FRONTIERS IN MARINE SCIENCE
(2020)
Article
Chemistry, Multidisciplinary
Kayla Gentile, Ambika Somasundar, Ashlesha Bhide, Ayusman Sen
Article
Chemistry, Multidisciplinary
Ambika Somasundar, Ayusman Sen
Summary: The development of nano and micromotors for actively delivering drugs to disease sites in vivo faces challenges such as safety, biocompatibility, ability to traverse body fluids, and reach cellular targets. Furthermore, scalability and uniformity in production are critical factors.
Article
Environmental Sciences
Ting Xu, Yanan Sun, Zhi Wang, Arunima Sen, Pei-Yuan Qian, Jian-Wen Qiu
Summary: Sclerolinum annulatus n. sp. is a newly described species of Siboglinidae found in the Haima cold seep of the South China Sea. It is morphologically distinct with transverse rings and elongated plaques on both sides of the dorsal furrow. Genetic analysis supports its placement in the genus Sclerolinum with a close relationship to an undescribed siboglinid from Japan.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Multidisciplinary Sciences
Arunima Sen, Liselotte W. Andersen, Kasper U. Kjeldsen, Loic N. Michel, Wei Li Hong, Marvin Choquet, Tine L. Rasmussen
Summary: We used ancient DNA extraction methods to confirm the genetic identity of a polychaete species that has been a matter of debate since its description. Our results revealed a high genetic match with a cryptic seep species. Additionally, we found that chemosynthesis-based polychaetes in Arctic seeps are not seep specialists and may have a relatively generalist habitat. Our findings suggest that Arctic chemosymbiotic animals seasonally vary their reliance on chemosynthetic partners due to the extreme seasonality of the Arctic.
Article
Chemistry, Multidisciplinary
Qi Wang, Qile Wang, Yuexiang Zhang, Yasmine M. Mohamed, Carlos Pacheco, Nan Zheng, Richard N. Zare, Hao Chen
Summary: In this study, a new redox neutral reaction involving intermolecular [3 + 2] annulation of N-cyclopropylanilines and alkenes was discovered through electrochemical methods, with a yield of up to 81%. This reaction was achieved by generating an N-cyclopropylaniline radical cation electrochemically and monitoring its reactivity toward alkenes using mass spectrometry. The reaction mechanism was shown to involve a chain mechanism, as supported by experimental evidence from the EC/MS platform.