Article
Biotechnology & Applied Microbiology
Young-gyun Park, Young Su Lee, Souvic Sarker, Eun Hye Ham, Un Taek Lim
Summary: Recently, the potential of using positive phototaxis exhibited by natural enemies to enhance pest control efficiency in agriculture has been explored in Korea and Japan. This study evaluated the responses of seven natural enemies to different wavelengths of LED light and assessed how mating status and gender affected their responses using a video tracking system. The results showed that wavelengths of 385 nm and 405 nm were highly attractive to most natural enemies, except for two species. Unmated females of one species moved greater distances than mated ones, while both males and females of another species remained longer under UV light. Therefore, the use of UV or near-UV lighting could help retain natural enemies in specific agricultural contexts for better pest control.
BIOLOGICAL CONTROL
(2023)
Article
Polymer Science
Fatima Hammoud, Akram Hijazi, Sylvain Duval, Jacques Lalevee, Frederic Dumur
Summary: The article presents a series of compounds based on the 5,12-dihydroindolo[3,2-a]carbazole scaffold, where selective introduction of different functional groups on the two carbazole moieties was achieved by controlling reaction conditions. Experimental evidence showed higher reactivity of one of the carbazoles, leading to the generation of asymmetrically substituted structures.
EUROPEAN POLYMER JOURNAL
(2022)
Article
Chemistry, Applied
Hong Chen, Guillaume Noirbent, Yijun Zhang, Ke Sun, Shaohui Liu, Damien Brunel, Didier Gigmes, Bernadette Graff, Fabrice Morlet-Savary, Pu Xiao, Frederic Dumur, Jacques Lalevee
Summary: Chalcones have been synthesized with 18 different derivatives, serving as catalysts for both free radical and cationic polymerization. These dyes show excellent efficiency in acrylate polymerization under LED 405 nm, and can also promote the cationic polymerization of EPOX. Additionally, stereoscopic 3D patterns were successfully fabricated using the DLW technique, demonstrating reversible swelling properties and shape-memory effects.
Article
Biochemistry & Molecular Biology
Yenthel Verhaegen, Libao Liu, Tien T. Nguyen, Tom Van Loy, Arnout R. D. Voet, Dominique Schols, Wim Dehaen, Steven De Jonghe
Summary: A diverse library of compounds was synthesized through various reactions on a bromo-naphthalene precursor, and demonstrated CCR8 antagonistic properties in experiments, with decreased activity possibly explained by homology molecular modeling.
BIOORGANIC CHEMISTRY
(2021)
Article
Orthopedics
Linlin Liu, Chang Liu, Congying Deng, Xin Wang, Xiangde Liu, Maolin Luo, Shuxian Wang, Juncai Liu
Summary: Studies on 3D-printed porous bone scaffolds mainly focus on material and structural parameters. However, repairing large femoral defects requires selecting appropriate structural parameters based on the needs of different parts. This paper proposes a stiffness gradient scaffold design concept, using different structures for different functions. An integrated fixation device is also designed for scaffold fixation. Finite element method analysis shows that the stress distribution of stiffness gradient scaffolds is more uniform, and the strain of host bone tissue is significantly changed, promoting bone tissue growth. The integrated fixation method provides stability, less stress, and even distribution, making it effective for repairing large femoral bone defects.
JOURNAL OF ORTHOPAEDIC SURGERY AND RESEARCH
(2023)
Article
Chemistry, Analytical
Changwoo Noh, Changwoo Han, Sang Min Won, Changhwan Shin
Summary: A novel vertical gate-all-around device architecture GAA-FinFET was proposed to improve device performance and address the short channel effect. Compared to conventional FinFET and NSFET, GAA-FinFET exhibited superior characteristics in terms of SCE and electrical performance.
Article
Multidisciplinary Sciences
Yaru Qin, Qihui Wang, Chenglong Shi, Bing Liu, Shuqing Ma, Miao Zhang
Summary: This paper comprehensively evaluates the static mechanical properties, permeability, and cell adhesion effect of Ti6Al4V bionic scaffolds with different axial diameter ratios using numerical simulation and experiments. The results show that the scaffold with a non-1:1 axial diameter ratio has more advantages than the ordinary uniform scaffold structure with a 1:1 axial diameter ratio, which is of great significance for the optimal design of scaffolds.
SCIENTIFIC REPORTS
(2022)
Article
Engineering, Electrical & Electronic
Yabin Sun, Meng Wang, Xianglong Li, Shaojian Hu, Ziyu Liu, Yun Liu, Xiaojin Li, Yanling Shi
Summary: An improved parasitic-aware design technology co-optimization (DTCO) for gate-all-around nanosheet field effect transistor (GAA-NSFET) at 3 nm node is proposed in this article. The presented method optimizes power, performance, and area (PPA) of the benchmark circuit by considering structure parameters and process effects, achieving significant improvements in power consumption, speed, and area. This optimization and design foundation for GAA-NSFET in future 3 nm technology node will be valuable for further research and development.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2022)
Article
Chemistry, Multidisciplinary
Mun Kyoung Kim, Hojeong Lee, Jong Ho Won, Woohyeong Sim, Shin Joon Kang, Hansaem Choi, Monika Sharma, Hyung-Suk Oh, Stefan Ringe, Youngkook Kwon, Hyung Mo Jeong
Summary: This study presents a novel tin oxide nanoparticle catalyst with highly controlled sub-nanoscale interplanar gaps synthesized via the lithium electrochemical tuning method. The catalyst shows significant enhancement in CO2RR selectivity and stability over 50 hours, indicating the potential of controlled atomic spaces in directing electrochemical reaction selectivity and the design of highly optimized catalytic materials.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Engineering, Biomedical
Drake D. Pedersen, Seungil Kim, Antonio D'Amore, William R. Wagner
Summary: Development of tissue engineered scaffolds for cardiac valve replacement is reaching the stage of clinical application. However, there is a lack of research on degradable valve scaffolds, which is crucial for short-term survival and long-term remodeling. This study aimed to characterize strain profiles on the leaflets of degradable polymeric valve scaffolds and examine the impact of material stiffness and geometric configuration on valve performance. The results showed that both material stiffness and geometric configuration significantly affected valve performance, with the latter having a greater impact. The findings provide valuable insights for valve design using tissue engineered scaffolds.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2023)
Article
Psychology, Developmental
Lisa-Marie Collimore, Mark A. Schmuckler
Summary: This study investigated the impact of perceptual-motor context on cognitive-spatial reasoning and found that reaching around a barrier affects infants' search behavior. Interestingly, reaching around a barrier improves B trial performance for younger infants.
JOURNAL OF EXPERIMENTAL CHILD PSYCHOLOGY
(2024)
Article
Computer Science, Interdisciplinary Applications
Shimeng Qiao, Helong Yu, Ali Asghar Heidari, Ayman A. El-Saleh, Zhennao Cai, Xingmei Xu, Majdi Mafarja, Huiling Chen
Summary: This paper proposes an enhanced whale optimization algorithm (WDNMWOA) based on worst individual disturbance (WD) and neighborhood mutation search (NM) to address the issues of weak global exploration and low optimization accuracy in the original algorithm. The experimental results demonstrate that WDNMWOA has better convergence accuracy and stronger optimization ability compared to the original WOA.
JOURNAL OF COMPUTATIONAL DESIGN AND ENGINEERING
(2022)
Article
Engineering, Electrical & Electronic
Soyoun Kim, Kitae Lee, Sihyun Kim, Munhyeon Kim, Jong-Ho Lee, Sangwan Kim, Byung-Gook Park
Summary: By comparing Gate-All-Around Field-Effect Transistors (GAAFETs) with FinFETs at the 3-nm technology nodes, the effect of tapered fin shape on device performance is determined. TCAD simulation is utilized to analyze various figures of merit for different supply voltages, and it is found that the optimal taper angle can enhance the device performance, particularly in terms of AC characteristics.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2022)
Article
Chemistry, Physical
Nisha Yadav, Sunil Jadav, Gaurav Saini
Summary: To meet the scaling targets and continue with Moore's Law, the transition from FinFET to Gate-All-Around (GAA) nanosheet Field Effect Transistors (FETs) is necessary. This work benchmarks nanosheet FET against FinFET and finds that stacked nanosheet FET offers improved performance. The study investigates the impact of geometrical parameter variations on the performance of stacked nanosheet FET and identifies the factors that contribute to better driving capability, current, and delay.
Article
Environmental Sciences
Ronghua Yu, Qichao Wang, Guangyao Dai, Xiangcheng Chen, Chao Ren, Jintao Liu, Dongrui Li, Xitao Wang, Haishuai Cao, Shengguang Qin, Songhua Wu
Summary: A 1550 nm all-fiber dual-polarization coherent Doppler lidar (DPCDL) was developed to measure the depolarization ratio of atmospheric aerosols. The performance of the system was evaluated through calibration procedures and compared with a micro-pulse polarization lidar. The results confirmed the authenticity of the depolarization ratio measured with the DPCDL.
Article
Polymer Science
Frederic Dumur
Summary: Photopolymerization under visible light has made significant progress in recent years, thanks to the development of new irradiation setups based on LEDs. Efficient photoinitiating systems that match the light sources used in 3D printers have become increasingly important. However, visible light photoinitiators, although they increase the thickness of the polymerized films, are often strongly colored compounds that hinder the use of photopolymers for everyday applications. To tackle this issue, the development of photobleachable photoinitiating systems has emerged as a promising research field. This review provides an overview of recent advances in photobleachable photoinitiators and discusses the exploration of various structures to address the challenge of achieving colorless coatings.
EUROPEAN POLYMER JOURNAL
(2023)
Article
Biochemistry & Molecular Biology
Thanh-Tuan Bui, Sebastien Peralta, Frederic Dumur
Summary: Fifteen push-pull dyes based on tetracyclic polyaromatic pyrene were synthesized and their optical properties were investigated in twenty-two solvents with different polarities. Surprisingly, contrary to conventional D-pi-A push-pull dyes, negative solvatochromism was observed in many of the dyes. Photoluminescence and thermal properties were also examined, and theoretical calculations were conducted to support the experimental findings.
Review
Polymer Science
Frederic Dumur
Summary: Anthraquinone has been identified as a promising scaffold for designing photoinitiating systems activable in the visible range and under low light intensity. Molecular engineering has allowed the development of water-soluble, panchromatic, or photobleachable dyes based on this scaffold. This review provides an overview of recent advances in photopolymerization using anthraquinone-based photoinitiating systems.
EUROPEAN POLYMER JOURNAL
(2023)
Article
Polymer Science
Marie Le Dot, Nicolas Giacoletto, Fabrice Morlet-Savary, Bernadette Graff, Valerie Monnier, Didier Gigmes, Malek Nechab, Frederic Dumur, Pierre Gerard, Jacques Lalevee
Summary: A new configuration of Metal Acetylacetonate Bidentate Ligand Interaction (MABLI) mechanism has been discovered for initiating the polymerization of recyclable Elium (R) thermoplastic resins under mild conditions. The presence of a phosphine oxide significantly reduces curing time and achieves nearly 100% conversion. Additionally, the combination of MABLI and photoactivation in a dual cure approach enhances the polymerization efficiency.
EUROPEAN POLYMER JOURNAL
(2023)
Review
Polymer Science
Frederic Dumur
Summary: Photopolymerization is a research field that aims to replace energy-consuming UV irradiation setups with energy-saving light-emitting diodes (LEDs) or even sunlight as a light source. Various dyes have been developed to efficiently promote polymerization processes under sunlight, enabling the use of photopolymerization in outdoor applications. This review provides an overview of different photoinitiating systems developed for polymerization processes under sunlight or daylight, comparing their efficiency to that of artificial light sources.
EUROPEAN POLYMER JOURNAL
(2023)
Review
Chemistry, Physical
Frederic Dumur
Summary: Photopolymerization is an active research field focused on polymerizing in greener conditions using visible light instead of traditional UV light. Furane is an interesting candidate for designing photocatalysts of polymerization due to its low cost and easy chemical modification. This review provides an overview of furane-based photoinitiator design and compares them to reference systems to demonstrate their potential in innovative structures.
Review
Chemistry, Physical
Frederic Dumur
Summary: Photopolymerization uses light as the activation source to convert liquid monomers to polymers. The development of visible light photo-initiating systems and the search for new dyes that can polymerize a resin within seconds are ongoing. Quinoxaline has been identified as a promising scaffold for designing UV-centered and visible light photo-initiating systems. This review provides an overview of different quinoxaline-based dyes and compares them with reference systems to demonstrate their significance.
Article
Polymer Science
Frederic Dumur
Summary: Photoinitiating systems activable under visible light are the subject of many studies due to their ability to achieve higher light penetration. The reactivity of these systems can be improved by investigating new dye structures, including naphthoquinones which have been underexplored as visible light photoinitiators of polymerization. Recent developments have shown promising results in designing photoinitiators with naphthoquinone, paving the way for future advancements. This review provides an overview of different photoinitiators containing a naphthoquinone unit and compares their polymerization efficiencies with reference compounds.
EUROPEAN POLYMER JOURNAL
(2023)
Review
Polymer Science
Frederic Dumur
Summary: Iodonium salts, a type of cationic photoinitiators, have a long history of use in the polymerization of epoxides or vinyl ethers. However, their UV-centered absorption restricts their use to the visible range through a photosensitization process. To simplify the composition of photopolymerizable resins, various dyes have been covalently linked to iodonium salts, resulting in monocomponent photoinitiating systems. This review provides an overview of the different dyes connected to iodonium salts.
EUROPEAN POLYMER JOURNAL
(2023)
Article
Polymer Science
Frederic Dumur
Summary: Photopolymerization is undergoing a revolution with the emergence of affordable and easily accessible LEDs, making polymerization possible under safe and energy-saving conditions. Bodipys, which are renowned for their high photoluminescence quantum yields, exceptional molar extinction coefficients, and narrow absorption and emission bands, have been identified as a promising platform for designing photoinitiators. Recent advancements in difluoroborane derivatives, such as boranils, squaraine-derived structures, and 2-phenacylbenzoxazole difluoroboranes, have expanded the application scope of photopolymerization. This review presents the various bodipys, boranils, squaraine-based difluoroborate complexes, and 2-phenacylbenzoxazole difluoroboranes used in developing photoinitiating systems and compares their efficiency to reference photoinitiating systems.
EUROPEAN POLYMER JOURNAL
(2023)
Review
Polymer Science
Frederic Dumur
Summary: In recent years, research efforts have focused on multicomponent photoinitiating systems, especially for the design of visible light photoinitiating systems. Monocomponent Type II photoinitiators have been designed to simplify the elaboration of photocurable resins. Sulfonium salts, as remarkable photoinitiators, lack absorption in the visible range, leading to various structural modifications for redshifting their absorptions. This work provides an overview of different sulfonium salts activable under visible light.
Article
Chemistry, Multidisciplinary
Yijun Zhang, Zheng Liu, Timur Borjigin, Bernadette Graff, Fabrice Morlet-Savary, Michael Schmitt, Didier Gigmes, Frederic Dumur, Jacques Lalevee
Summary: Seventeen carbazole-fused coumarin-based oxime esters were developed as efficient and visible light-absorbing initiators for polymerization. Certain oxime esters exhibited comparable or better photoinitiation performance than the benchmark photoinitiator under LED irradiation. These oxime esters also showed thermal initiation behavior and could be used as both thermal and photo-initiators. Moreover, two oxime esters, OXE-1 and OXE-5, were found to be sunlight activable and achieved high monomer conversion rates within one hour.
Article
Chemistry, Physical
Nataliya Kalashnyk, Adam Hassan Denawi, Frederic Dumur, Didier Gigmes, Xavier Bouju, Sylvain Clair
Summary: The supramolecular self-assembly of s-indacene-1,3,5,7(2H,6H)-tetrone on the Cu(111) surface was investigated and six different phases were found, driven by different interactions. Host-guest interactions allowed for the accommodation of molecular or metal clusters inside the nanoporous patterns. Three metal-organic networks led to the creation of regular arrays of isolated metal adatoms or adatom clusters.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Fatima Hussein, Corentin Pigot, Francisco Romero Lairado, Marco Minissale, Eric Salomon, Thierry Angot, Frederic Dumur, Malek Nechab, Didier Gigmes, Sylvain Clair, Luca Giovanelli
Summary: On-surface synthesis is an important tool for building covalently bonded molecular nanostructures and offers new synthetic pathways. This study investigates the adsorption behavior of a chiral molecule on a metal surface, demonstrating the formation of low-dimensional structures through activated homocoupling reactions and showcasing adsorption-induced chiral inversion.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Polymer Science
Fatima Hammoud, Aristea Pavlou, Alexandros Petropoulos, Bernadette Graff, Michael G. Siskos, Akram Hijazi, Fabrice Morlet-Savary, Frederic Dumur, Jacques Lalevee
Summary: A series of Type I photoinitiators based on the naphthoquinone scaffold were designed and synthesized for the first time to induce photopolymerization under visible light. These photoinitiators exhibited excellent photoinitiation abilities and some even outperformed the benchmark Type I phosphine-oxide. The chemical mechanisms supporting the photopolymerization process were investigated, and the newly proposed structures showed higher efficiency in free radical photopolymerization. Additionally, 3D objects were successfully fabricated using a direct laser writing approach.
