Article
Chemistry, Multidisciplinary
Soo-Jung Kwak, Sang-Sun Oh, Yong-Hyun Ahn, Seung-Hoi Kim
Summary: A novel catalyst has been developed by immobilizing Cu(OAc)2 salt to polydopamine-coated magnetite (Fe3O4). The catalyst, characterized using various techniques, was found to be effective for synthesizing 1,2,3-triazoles in high yield under green conditions in water. The catalyst can be easily separated and reused without significant loss of efficiency, and the process is simple, environmentally friendly, and economical.
Article
Physics, Fluids & Plasmas
R. Mark Bradley, Patrick D. Shipman
Summary: In this study, the patterns created by scanning an atomic force microscope tip over a polymer surface were investigated using a mesoscopic model. The research discovered that the steady-state solution is only stable below a critical value, beyond which periodic stick-slip motion occurs.
Article
Chemistry, Physical
Ruixue Zhang, Yan Chen, Muhua Ding, Jie Zhao
Summary: This review provides a comprehensive summary of seminal heterogenized Cu-catalyzed homogenous catalysis reported over the last decade, highlighting the potential and synthetic perspectives of heterogeneous copper catalysis in both academic and industry.
Article
Materials Science, Multidisciplinary
Yongda Yan, Zihan Li, Jiqiang Wang, Yanquan Geng
Summary: This paper compares the material removal mechanisms of single-scratch and nanomilling processes on a copper surface using molecular dynamics simulations. By analyzing the groove morphology, atomic flow behavior, and the variation in scratching force, the material removal mechanism is revealed. The effects of tip trajectory and crystallographic orientation on atomic removal are also studied. The findings provide important insights for improving the ability of tip-based nanomachining.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Chunwei Dong, Ren-Wu Huang, Arunachalam Sagadevan, Peng Yuan, Luis Gutierrez-Arzaluz, Atanu Ghosh, Saidkhodzha Nematulloev, Badriah Alamer, Omar F. Mohammed, Irshad Hussain, Magnus Rueping, Osman M. Bakr
Summary: In this study, a synthesis method for obtaining an atomically precise nanoparticle with a surface-defective analogue is reported. The loss of a single surface atom drastically alters the reactivity of the nanoparticle, showing promising activity for click chemistry, especially photoinduced azide-alkyne cycloaddition. This study not only uncovers the effect of single-surface atom modification on nanoparticle properties but also demonstrates the potential of single-atom surface modification as a means for designing nanoparticle catalysts.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Physics, Fluids & Plasmas
Pedro J. Martinez, Enrico Gnecco, Juan J. Mazo
Summary: This study investigates the quantifiable characteristics of wave-like features observed on polymer surfaces when examined with AFM, and demonstrates the presence of ripples and dotted regions under different parameter values. The amplitude, period, and orientation of these features are numerically estimated, revealing a cooperative process involving the scanning of multiple lines leading to the emergence of ripples.
Article
Physics, Multidisciplinary
Simone Benaglia, Manuel R. Uhlig, Jose Hernandez-Munoz, Enrique Chacon, Pedro Tarazona, Ricardo Garcia
Summary: This study demonstrates that the generation of 3D maps is dependent on the polarization of the tip, with differently charged tips revealing different density distributions. Experimental data reproduce key findings of the theory.
PHYSICAL REVIEW LETTERS
(2021)
Article
Chemistry, Physical
Carlos Lizandara-Pueyo, Xinyuan Fan, Carles Ayats, Miquel A. Pericas
Summary: This study involved the controlled synthesis of calcium carbonate particles surface-functionalized with azido groups, followed by copper-catalyzed alkyne-azide cycloaddition reactions to prepare novel catalytic materials. The immobilized catalyst demonstrated high selectivity and efficiency in catalyzing Michael addition reactions of aldehydes, with the added advantage of being reusable and adaptable to continuous-flow operation for increased productivity.
JOURNAL OF CATALYSIS
(2021)
Article
Chemistry, Multidisciplinary
Jinhyoung Lee, Eungchul Kim, Jinill Cho, Hyunho Seok, Gunhoo Woo, Dayoung Yu, Gooeun Jung, Hyeon Hwangbo, Jinyoung Na, Inseob Im, Taesung Kim
Summary: This study presents a novel method of tip-induced optoelectrical engineering that allows remote control and detection of interfacial charge transfer dynamics in hybrid molecular systems. The approach combines photo-induced force microscopy and Kelvin probe force microscopy to achieve high spatial resolution. The results reveal the optoelectrical origin of metal-molecule interfaces and demonstrate the potential for non-destructive tunneling control in ultrathin hybrid molecular systems.
Article
Materials Science, Multidisciplinary
Benny Ku, Ferdinandus van de Wetering, Jens Bolten, Bart Stel, Mark A. van de Kerkhof, Max C. Lemme
Summary: This study treats particle contamination as a particle-plane problem and quantifies the van der Waals forces using vacuum atomic force microscopy (AFM) contact measurements. By combining numerical Hamaker theory and blind tip reconstruction, the Hamaker constants for different material systems have been successfully determined, providing important information for devising photomask cleaning strategies.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Chemistry, Physical
Shuo Deng, Ran Xu, Weibin Seh, Jiayi Sun, Weifan Cai, Jianping Zou, Qing Zhang
Summary: This paper presents the discovery of direct current (DC) generation through sliding a metal tip against a doped semiconductor. It is found that the DC current generation is degraded with repeated sliding. The study shows that an ultrathin silicon oxide layer can be induced during sliding, and annealing the clean silicon substrate can mitigate current degradation.
Article
Chemistry, Physical
Tapas Goswami, Sudhanshu Naithani, Amit Kumar, Sushil Kumar
Summary: We have synthesized two easily synthesizable, reusable and morphology-controlled copper nanostructures grafted over rGO. The nanocatalysts with rod-like and spherical nanostructures promoted the one-pot multicomponent click reaction to produce a 1,2,3-triazole derivative with high yield. The nanocomposites with rod-like morphology exhibited significantly higher catalytic activity and could rapidly synthesize the desired product in pure water.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Review
Chemistry, Multidisciplinary
Fengjuan Qin, Wenxing Chen
Summary: Single-atom alloy (SAA) catalysts play an important role in heterogeneous catalysis, with wide applications and outstanding performance in improving atom utilization and catalytic selectivity. Research progress on copper-based single-atom alloys is promising and shows potential applications in various catalytic reactions.
CHEMICAL COMMUNICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Nata F. S. de Bem, Michael G. Ruppert, Andrew J. Fleming, Yuen K. Yong
Summary: The article introduces an atomic force microscope cantilever with on-chip actuation and dual-sensing capabilities. A mathematical model is developed and validated, and a physical prototype is presented for calibration and validation. Experimental results demonstrate consistency with external measurements.
SENSORS AND ACTUATORS A-PHYSICAL
(2022)
Article
Chemistry, Physical
Shivani Bhagat, Shilpa Dani, Ankit Verma, Ravinder Dharavath, Umesh R. Pratap
Summary: Covalent triazine frameworks (CTFs) are synthesized and integrated with copper ions to form a catalyst (Cu@CTF) with excellent performance for click reaction. The catalyst shows fast reaction rate, high yield, and recyclability, indicating its superior applicability in catalysis. This research advances the development and usage of functional CTF materials for catalysis.
JOURNAL OF MOLECULAR STRUCTURE
(2023)
Review
Chemistry, Multidisciplinary
Xiao-Yang Chen, Hongliang Chen, J. Fraser Stoddart
Summary: The tetracationic cyclophane, known as the little blue box, is valuable in constructing stimuli-responsive materials by binding small pi-donors and forming complexes with viologen radical cations. Its significance in the discovery of host-guest complexes and mechanically interlocked molecules is highlighted.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
James S. W. Seale, Bo Song, Yunyan Qiu, J. Fraser Stoddart
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Yuanning Feng, Partha Jyoti Das, Ryan M. Young, Paige J. Brown, Jessica E. Hornick, Jacob A. Weber, James S. W. Seale, Charlotte L. Stern, Michael R. Wasielewski, J. Fraser Stoddart
Summary: In this study, a series of fluorescent dyes with quadrupolar A-D-A constitutions were synthesized and characterized. The effects of different electron-withdrawing groups at the termini of a para-terphenylene backbone were investigated. The fluorescence emission wavelengths covered a range from 380 to 557 nm, and the photophysical properties were attributed to intramolecular charge transfer.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Yu Wang, Huang Wu, Leighton O. Jones, Martin A. Mosquera, Charlotte L. Stern, George C. Schatz, J. Fraser Stoddart
Summary: Cocrystal engineering is a popular strategy for tuning the photophysical properties of crystalline materials. This study reports a color-tunable upconversion-emission switch based on the interconversion between two cocrystals. The research provides a critical example of precise control of cocrystal-to-cocrystal transformation and offers a reference for fabricating color tunable nonlinear optical materials in the solid state.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Review
Nanoscience & Nanotechnology
Hongliang Chen, Chuancheng Jia, Xin Zhu, Chen Yang, Xuefeng Guo, J. Fraser Stoddart
Summary: Developing new materials is a long-standing goal in various fields, and understanding single-molecule reactions can deepen our understanding of chemical reactions and provide new frameworks in materials science. This review focuses on state-of-the-art chemical reactions in single-molecule junctions and highlights the advantages of real-time testbeds for studying reaction dynamics, intermediates, transition states, and solvent effects. The behavior of single-molecule reactions is compared with reactions in ensemble states, and the potential of leveraging single-molecule catalysis for large-scale materials production is explored.
NATURE REVIEWS MATERIALS
(2023)
Review
Polymer Science
Han Han, James S. W. Seale, Liang Feng, Yunyan Qiu, J. Fraser Stoddart
Summary: Rotaxanes with well-defined ring sequences are attractive synthetic goals for constructing functional materials. Sequence-controlled synthesis of oligo- and polyrotaxanes is important for developing sequence-defined polymers and dynamic functional materials. This Review discusses the pivotal role of sequence isomerism in rotaxanes and explores different synthetic approaches for constructing sequence-controlled rotaxanes. By comparing the advantages and disadvantages of these approaches, possible synthetic strategies are proposed to predict the future of sequence-controlled synthesis of polyrotaxanes.
JOURNAL OF POLYMER SCIENCE
(2023)
Review
Chemistry, Multidisciplinary
Xinchun Yang, Zakir Ullah, J. Fraser Stoddart, Cafer T. Yavuz
Summary: Porous organic cages (POCs) are a new class of low-density crystalline materials that have wide applications in molecular recognition, gas storage and separation, and proton conduction. Compared to other porous structures like MOFs, COFs, and POPs, POCs have the advantages of specific surface areas, porosities, open pore channels, tunable structures, and solubilities in common solvents. This review summarizes recent progress in POCs, including their design, synthesis, characterization, and applications, and discusses future challenges and opportunities in the field.
Article
Chemistry, Multidisciplinary
Taeyeon Kim, Yuanning Feng, James P. O'Connor, J. Fraser Stoddart, Ryan M. Young, Michael R. Wasielewski
Summary: Designing and controlling charge transfer pathways in organic semiconductors are crucial for solar energy applications. This study investigates the photoinduced charge transfer and relaxation dynamics in host-guest complexes, and demonstrates that the charge transfer pathway can be controlled by subtle chemical modifications of the acceptor host.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Yang Liu, Xin-Ru Guan, Duan-Chao Wang, J. Fraser Stoddart, Qing-Hui Guo
Summary: Single-crystal-to-single-crystal (SCSC) polymerization is an effective method for environmentally friendly preparation of polymer single crystals (PSCs) with high crystallinity and molecular weights. Solubility and solution processibility are major challenges for practical applications of PSCs, but this study successfully synthesized soluble and processable PSCs with rigid polycationic backbones. The resulting polymeric crystals have excellent solubility, crystallinity and rheological properties, and can be characterized using various techniques.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Editorial Material
Multidisciplinary Sciences
Huang Wu, Chun Tang, Long Zhang, J. Fraser Stoddart
NATIONAL SCIENCE REVIEW
(2023)
Article
Chemistry, Multidisciplinary
Ping Zhou, Yanjun Fu, Maolin Wang, Renhui Qiu, Yuwei Wang, J. Fraser Stoddart, Yuping Wang, Hongliang Chen
Summary: Supramolecular electronics use noncovalent interactions like π-π and hydrogen bonding to introduce molecular assemblies into electronic devices. This research demonstrates a strategy for building electronically robust switches using two different noncovalent interactions. By compressing the junction, the single-supermolecule switch is turned ON through π-π interactions dominating the transport. Stretching the junction to form hydrogen-bonded dimers turns the switch OFF, resulting in a dramatic decrease in conductance. The study shows the potential for designing robust bistable mechanoresponsive devices for integrated circuits in microelectromechanical systems.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Chi-Hsien Wang, Yi-Chia Lin, Surojit Bhunia, Yuanning Feng, Pramita Kundu, Charlotte L. Stern, Pei-Lin Chen, J. Fraser Stoddart, Masaki Horie
Summary: In this study, stimuli-responsive molecular crystals with distinct thermal phase transitions, photoinduced deformations, and mechanical behavior were reported. The understanding of the correlation between structure-thermomechanical and structure-photomechanical properties was advanced for the development of multi-stimulus-responsive materials.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Fangbai Xie, Haochuan Mao, Chenjian Lin, Yuanning Feng, J. Fraser Stoddart, Ryan M. Young, Michael R. Wasielewski
Summary: This study demonstrates that a photogenerated spin-correlated radical ion pair can be used to sense an electric field change through molecular recognition. The experiment shows that the distance between the two charges decreases when a certain molecule encapsulates one of the charges, indicating that the system can function as a quantum sensor to detect electric field changes.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Review
Chemistry, Multidisciplinary
Huangtianzhi Zhu, Liya Chen, Bin Sun, Mengbin Wang, Hao Li, J. Fraser Stoddart, Feihe Huang
Summary: Macrocyclic molecules have broad applications due to their guest binding properties. Extending host-guest chemistry from solution to the solid state enables the formation of more stable and processable complexes. Solid-state host-guest chemistry can encapsulate guests with higher affinities, which is crucial for applications in separation science and devices.
NATURE REVIEWS CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Yu Wang, Huang Wu, Leighton O. Jones, Martin A. Mosquera, Charlotte L. Stern, George C. Schatz, J. Fraser Stoddart
Summary: Cocrystal engineering is a popular strategy for tuning the photophysical properties of crystalline materials. This research presents a color-tunable upconversion-emission switch based on the interconversion between two cocrystals, demonstrating the reversible transformation and color change mechanism between cocrystals.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)