Article
Chemistry, Physical
Jiaxing Du, Jianwei Shi, Chun Li, Qiuyu Shang, Xinfeng Liu, Yuan Huang, Qing Zhang
Summary: Researchers demonstrated a directional second harmonic generation (SHG) amplifier formed by MoS2/WS2 monolayer heterostructures, achieving significant enhancement of SHG and improved radiation angle, attributed to the excitation and emission field concentration induced by a vertical Fabry-Perot microcavity.
Article
Chemistry, Inorganic & Nuclear
Gang Yang, Xingxing Jiang, Chao Wu, Zheshuai Lin, Zhipeng Huang, Mark G. Humphrey, Chi Zhang
Summary: Two chalcogenide crystalline compounds, [enH(2)][Ag4Sb2S6] and [enH][Ag2SbS3], were successfully synthesized through mild ionothermal and solvothermal means. The [enH][Ag2SbS3] compound, which crystallizes in a noncentrosymmetric and polar space group, exhibits significant birefringence at 1064nm and is phase-matchable for SHG applications. The compounds' optical band gaps were also determined, and theoretical studies were conducted to further understand the relationship between band structure and nonlinear optical properties.
DALTON TRANSACTIONS
(2021)
Article
Chemistry, Organic
Yetong Zhang, Lepeng Chen, Yinlin Shao, Fangjun Zhang, Zhongyan Chen, Ningning Lv, Jiuxi Chen, Renhao Li
Summary: The study presents a three-component tandem reaction allowing the synthesis of polysubstitution quinolines using 2-aminobenzonitriles, arylboronic acids, and ketones. This method is practical, efficient, and delivers functional quinolines with moderate to good yields and high functional group tolerance. Additionally, a new method for introducing halogen substituents into the target products has been developed, showing potential for further synthetic elaborations.
ORGANIC CHEMISTRY FRONTIERS
(2021)
Article
Chemistry, Organic
Darte Wetzel, Ulrich Luening
Summary: A monodisperse second generation self-assembled dendrimer was synthesized by combining supramolecular chemistry and dynamic covalent chemistry. The ligands were differentiated using a mesitylene unit in the 6,6''-position of one of the terpyridines. Solubility issues were solved by introducing an ethylhexyl ether. The successful formation of the dendrimers was confirmed by H-1 NMR and DOSY NMR spectroscopy, and both first and second generation dendrimers were detected using ESI HRMS.
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Cong Liu, Irina Legchenkova, Libao Han, Wenna Ge, Cunjing Lv, Shile Feng, Edward Bormashenko, Yahua Liu
Summary: The research reported experimental studies on the impact of droplets on superhydrophobic circular groove arrays, resulting in directional droplet transport. The influence of factors such as Weber number, ridge height, and deviation distance on lateral offset distance of bouncing drops was further explored. The study confirmed the suggested theoretical analysis, showing the importance of wetting transition and dynamic pressure in directional droplet transport.
Article
Optics
Supriya Sundareswaran, Srinivasan Karuppannan
Summary: The stable Form-I and metastable Form-II polymorphs of vanillin were successfully separated through nucleation control with selected templates. Both polymorphs exhibit good thermal stability and high SHG efficiency, making them promising for nonlinear optical applications.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Engineering, Marine
Kevin Ewans, Hans Fabricius Hansen, Allan Rod Zeeberg
Summary: Power spectral density and frequency-dependent directional spreading functions have been developed to describe extreme sea state spectra in the Danish sector of the North Sea. Based on measurements from Directional Waverider buoys, the new spreading function is defined through a simple parameterization of frequency-dependent spreading. The comparison with measurements confirms the accuracy of the new spreading function in representing the actual spreading conditions.
Article
Chemistry, Physical
Christian Jonin, Estelle Salmon, Faheem Ahmed, Mohammed Benali Kanoun, Chawki Awada, Pierre-Francois Brevet
Summary: This report proposes a new method based on polarization discrimination to separate SHG and MEPL contributions. The polarization analysis of intensity depth profiles demonstrates a polarization angle shift for the SHG intensity contribution compared to the MEPL one, allowing for the discrimination of the two.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Instruments & Instrumentation
Nikolai R. Lobanov, Peter Linardakis, Daniel Tempra
Summary: The chopping system of a tandem accelerator based on two pairs of parallel plates was investigated in this study. Experimental procedures for measuring the performance of the chopping system, including Beam Profile Monitor (BPM) technique and pulsed beam diagnostic monitor, were described. Results of simulations and experimental observations, as well as an analytical technique for reconstructing the real profile of deflected beams, were presented. Additionally, theoretical and experimental data on the chopper scanning window were discussed, and an analysis of factors limiting system performance was conducted with technical solutions proposed.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
(2021)
Article
Engineering, Electrical & Electronic
Yaqiong Li, Xunhui Lei, Chengcheng Liu, Lifeng Zhang
Summary: The study found that when growing bulk Si from Si-Fe alloy, metal and oxide impurity particles form in the melt, which are captured by bubbles and ultimately aggregate or float as a slag layer. Some impurities segregate at the solid Si/liquid Si-Fe interface and enrich in the alloy phase. Based on these characteristics, a potential production technology is proposed.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2021)
Editorial Material
Engineering, Electrical & Electronic
Kunlun Wang, Yang Yang, Jiong Jin, Tao Zhang, Arumugam Nallanathan, Chintha Tellambura, Bijan Jabbari
Summary: Multi-tier computing enables flexible computation and communication resource sharing by offloading computation-intensive tasks to nearby servers along the cloud-to-thing continuum. It extends the traditional cloud computing architecture to the edge of the network by distributing computing, storage, and communication functions anywhere between the cloud and the endpoint. Multi-tier computing networks with heterogeneous computing resources and collaborative service architectures can support a full range of computing and networking services for different environments and applications.
IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS
(2023)
Article
Engineering, Civil
Shuo Feng, Yiheng Feng, Haowei Sun, Shan Bao, Yi Zhang, Henry X. Liu
Summary: Testing scenario library generation (TSLG) is a critical step for CAV development and deployment. This study proposes a general method for TSLG and investigates theoretical properties regarding CAV evaluation. By designing and studying three typical cases, the proposed method is shown to accelerate CAV evaluation with high accuracy, especially when enhanced by reinforcement learning technique.
IEEE TRANSACTIONS ON INTELLIGENT TRANSPORTATION SYSTEMS
(2021)
Article
Chemistry, Multidisciplinary
ZhiNan Zuo, Ruiying Wang, Yingling Dong, Benlai Wu
Summary: In this study, two homochiral coordination polymers based on zinc/cadmium clusters were synthesized and their thermal stability and optical properties were investigated.
CRYSTAL GROWTH & DESIGN
(2022)
Article
Chemistry, Multidisciplinary
Yehoshua Shapira, Yon Lai, Shirley Schonberger, Nir Shpack, Tamar Finkelstein
Summary: This study evaluates the early radiographic characteristics and the role of the third molar (MM3) in the impaction process of the mandibular second molar (MM2). The primary cause of MM2 impaction was found to be differential root developments and deficient mesial root lengths. Posterior crowding and arch length deficiency were contributing factors. Further investigation is needed to determine the possible involvement of the third molar in MM2 impaction.
APPLIED SCIENCES-BASEL
(2022)
Article
Optics
Kai Guo, Jintao Wu, Fujia Chen, Keya Zhou, Shutian Liu, Zhongyi Guo
Summary: Enhanced second harmonic generation (SHG) and directional emission can be achieved from a topological corner state in an all-dielectric topological photonic crystal, showing a high Q-factor and strong confinement of light at the corner. The enhanced SHG also exhibits robustness against a broad class of defects, offering practical advantages for integrated optical circuits.
Article
Chemistry, Organic
Priscilla Mendonca Matos, William Lewis, Stephen P. Argent, Jonathan C. Moore, Robert A. Stockman
Article
Biophysics
Jennifer M. K. Wakefield, Susan Braovac, Hartmut Kutzke, Robert A. Stockman, Stephen E. Harding
EUROPEAN BIOPHYSICS JOURNAL WITH BIOPHYSICS LETTERS
(2020)
Article
Chemistry, Multidisciplinary
Suzanne J. Partridge, David M. Withall, John C. Caulfield, John A. Pickett, Robert A. Stockman, Neil J. Oldham, Michael A. Birkett
Summary: This study investigated the biosynthesis of nepetalactol and nepetalactone in pea aphids using isotopically-labeled monoterpenoids as molecular probes. The results suggest that iridoid biosynthesis in animals, specifically aphids, may follow a broadly similar route to that characterized for plants.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Multidisciplinary Sciences
Michelle Cutajar, Fabrizio Andriulo, Megan R. Thomsett, Jonathan C. Moore, Benoit Couturaud, Steven M. Howdle, Robert A. Stockman, Stephen E. Harding
Summary: A novel polyhydroxylated monomer was synthesized from sustainable terpene feedstock derived from pine trees and used to prepare a polymer for wood consolidation purposes. Extensive characterization revealed the polymer's elongated shape, hydrogen bonding potential, and suitable molecular weight for further consideration as a potential consolidant.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Organic
Rafid S. Dawood, Robert A. Stockman
Summary: This method efficiently synthesizes two natural products (+)-monomorine I and (+)-indolizidine 195B in high yields from a readily available alcohol, with selective access to two distinct diastereomers through the judicious use of solvent in a nucleophilic addition reaction.
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
(2021)
Article
Biochemistry & Molecular Biology
Michelle Cutajar, Robert A. Stockman, Susan Braovac, Calin Constantin Steindal, Angeliki Zisi, Stephen E. Harding
Summary: Butvar B-98 and PDMS-OH have been identified as effective consolidants for archaeological wood. They offer an alternative to aqueous-based consolidants as they are soluble in organic solvents. Extensive characterization studies have been conducted on these polymers to provide conservators with information about their physical properties.
Article
Polymer Science
Mariana d'Almeida Gameiro, Philippa L. Jacob, Kristoffer Kortsen, Thomas Ward, Vincenzo Taresco, Robert A. Stockman, Yonas Chebude, Steven M. Howdle
Summary: This study reports a green and efficient extraction method for triglyceride vernonia oil from Vernonia galamensis using supercritical carbon dioxide, and successfully synthesizes polymerisable monomers based on vernolic acid.
JOURNAL OF POLYMER SCIENCE
(2022)
Article
Polymer Science
Rachel L. Atkinson, Matthew Elsmore, Sean Smith, Morgan Reynolds -Green, Paul D. Topham, Daniel T. W. Toolan, Matthew J. Derry, Olivia Monaghan, Vincenzo Taresco, Derek J. Irvine, Robert A. Stockman, Davide S. A. De Focatiis, Steven M. Howdle
Summary: We reported the synthesis of terpene-based monomers from beta-pinene, which can be used to produce polymers with high Tg values and well-defined structures. The synthesized materials showed promising properties as hard blocks in thermoplastic elastomers, and ABA triblock copolymers incorporating a renewable soft block were also successfully synthesized using a difunctional RAFT polymerization method. The initial phase separation behavior and adhesive properties of these copolymers were investigated, highlighting their potential as renewably sourced thermoplastic elastomers.
EUROPEAN POLYMER JOURNAL
(2022)
Article
Multidisciplinary Sciences
Michelle Cutajar, Fabricio Machado, Valentina Cuzzucoli Crucitti, Susan Braovac, Robert A. Stockman, Steven M. Howdle, Stephen E. Harding
Summary: The Oseberg Viking ship burial is an extensive collection of Viking wooden artefacts found in Norway. Due to previous treatment with alum, these artefacts are now in a degraded state. In order to prevent further deterioration, researchers have synthesized two hydroxylated polymers, TPA6 and TPA7, which have properties that make them suitable for wood consolidation. Characterization of these polymers shows their optimal molar mass, conformation, and hydroxylated nature, particularly TPA7, making it an interesting lead for further research.
SCIENTIFIC REPORTS
(2022)
Article
Biochemistry & Molecular Biology
Valentina Cuzzucoli Crucitti, Aleksandar Ilchev, Jonathan C. Moore, Harriet R. Fowler, Jean-Frederic Dubern, Olutoba Sanni, Xuan Xue, Bethany K. Husband, Adam A. Dundas, Sean Smith, Joni L. Wildman, Vincenzo Taresco, Paul Williams, Morgan R. Alexander, Steven M. Howdle, Ricky D. Wildman, Robert A. Stockman, Derek J. Irvine
Summary: This study utilized the alpha parameter, a molecular descriptor, to design terpene-based polymers resistant to biofilm formation by Pseudomonas aeruginosa. The potential biofilm resistance of terpene-derived monomers was predicted and ranked using the alpha parameter. The monomers from commercially available terpenes were polymerized and confirmed to have biofilm resistance properties. The scaled-up monomers were successfully printed and used to create bio-instructive microparticles. The observations in this study have significant potential to produce bio-resistant coatings, packaging materials, fibers, and medical devices.
Article
Polymer Science
Harriet R. Fowler, Dara M. O'Brien, Daniel J. Keddie, Cameron Alexander, Derek J. Irvine, Robert A. Stockman, Steven M. Howdle, Vincenzo Taresco
Summary: Polyols and polyacrylates are widely used in polymer synthesis and can be used as monomers, initiators, or building blocks. Finding bio-based/renewable sources for these compounds is crucial due to the increasing need to reduce dependency on fossil fuels. By functionalizing the alkene moieties of common terpenes through oxidation, the toolbox of bio-based diols and triols is expanded. These polyols can be easily converted into terpene-derived diacrylates under mild conditions. As demonstrated, these monomers can be used in aza-Michael polymerizations to form new (bio)degradable poly-beta-amino esters.
MACROMOLECULAR CHEMISTRY AND PHYSICS
(2023)
Article
Multidisciplinary Sciences
Michelle Cutajar, Susan Braovac, Robert A. Stockman, Steven M. Howdle, Stephen E. Harding
Summary: The evaluation of two terpene-derived polymers, TPA6 and TPA7, as consolidants for archaeological wood was conducted. The objective was to expand the non-aqueous treatment options for the highly degraded Oseberg collection. Both polymers successfully penetrated the wood specimens, with a higher concentration on the surface. They also increased the hardness of the specimen surfaces. It is suggested to increase the polymer concentration and soaking time to facilitate better penetration into the wood cores in future investigations.
SCIENTIFIC REPORTS
(2023)
Article
Polymer Science
Olivia R. Monaghan, Stephen T. Skowron, Jonathan C. Moore, Maria Pin-No, Kristoffer Kortsen, Rachel L. Atkinson, Eduards Krumins, Joachim C. Lentz, Fabricio Machado, Zeynep Onat, Adam Brookfield, David Collison, Andrei N. Khlobystov, Davide De Focatiis, Derek J. Irvine, Vincenzo Taresco, Robert A. Stockman, Steven M. Howdle
Summary: This study reports the discovery and analysis of a self-crosslinking sustainable terpene derived monomer, alpha-pinene methacrylate (alpha PMA), and investigates its behavior through computational and experimental methods. The monomer undergoes self-crosslinking during free radical polymerization by chain transfer through hydrogen abstraction from a pendant group. This self-crosslinking process can be exploited to generate renewable high internal phase emulsions.
Article
Polymer Science
Rachel L. Atkinson, Olivia R. Monaghan, Matthew T. Elsmore, Paul D. Topham, Daniel T. W. Toolan, Matthew J. Derry, Vincenzo Taresco, Robert A. Stockman, Davide S. A. De Focatiis, Derek J. Irvine, Steven M. Howdle
Summary: Terpenes are considered ideal candidates for sustainable polymer feedstocks due to their natural abundance and availability from existing waste streams. By using RAFT control, well-defined polymers and precise di- and multiblock copolymer architectures can be synthesized. A wide range of T-g values are observed for terpene (meth)acrylate homopolymers, which can be utilized to create renewably-sourced hard-soft block copolymers.
Review
Chemistry, Organic
Priscilla Mendonca Matos, Robert A. Stockman
ORGANIC & BIOMOLECULAR CHEMISTRY
(2020)
