Article
Materials Science, Ceramics
Minhua Sun, Xiuewei Yao
Summary: The study shows that in a supercooled monometallic liquid, atoms with smaller excess volume aggregate to form solid-like clusters, leading to the emergence of structural heterogeneity and dynamical crossover.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2021)
Article
Materials Science, Multidisciplinary
N. A. V. N. E. E. T. Kaur, G. A. U. T. A. M. Das
Summary: The authors developed plasmonic structures of zinc and zinc oxide on the surface of a tapered optical fiber using optical tweezing. The effect of the tweezing conditions on the distribution of the zinc or zinc oxide on the tapered fiber surface was investigated.
OPTICAL MATERIALS EXPRESS
(2022)
Article
Chemistry, Physical
Marceau Henot, Pierre-Michel Dejardin, Francois Ladieu
Summary: This study investigates the orientational dynamics of supercooled glycerol using molecular dynamics simulations and compares the results with experimental data. The findings suggest that the depolarized dynamic light scattering (DDLS) method has low sensitivity to cross-correlations, supporting the idea of directly comparing data from dielectric spectroscopy (DS) and DDLS to evaluate the impact of cross-correlations in polar liquids.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Ecology
Stephanie Jenouvrier, Lise Aubry, Silke van Daalen, Christophe Barbraud, Henri Weimerskirch, Hal Caswell
Summary: Individuals differ in many aspects, and these differences are not only due to individual traits, but also to individual stochasticity. Environmental conditions influence individual heterogeneity and stochasticity, thus affecting the demographic outcomes of populations.
Article
Chemistry, Physical
Jared A. Wood, Yawei Liu, Asaph Widmer-Cooper
Summary: This paper investigates the assembly of nanorods and finds that the preferred pathway usually involves the formation of monolayer assemblies, even in cases of high initial phase density. The presence of depletion attraction can alter nucleation pathways.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Materials Science, Biomaterials
Xiaokang Jin, Chengfeng Xu, Jinhua Hu, Shuting Yao, Zhiwen Hu, Bing Wang
Summary: The study introduced a versatile nanoplatform using antimonene nanosheets coated with biodegradable chitosan, loaded with small molecule photosensitizer IR820 and gold nanoparticles. This system demonstrated excellent photothermal and photodynamic properties, satisfactory degradability, photoacoustic imaging ability, good biocompatibility, and effective intracellular synergistic treatment triggered by near infrared light.
JOURNAL OF MATERIALS CHEMISTRY B
(2021)
Article
Chemistry, Physical
Palle Ramana Murthy, Parasuraman Selvam
Summary: This investigation studied the influence of different types of gold catalysts on the liquid-phase oxidation of glycerol, and found that CMK-3 supported gold nanocube exhibited the highest yield and excellent stability.
Article
Chemistry, Multidisciplinary
Yongfeng Tian, Lu Zhao, Yonghua Pan, Zhengfeng Li, Xiaofeng Shen, Xia Zhang, Xianghu Tang, Xin Feng, Xingjiu Huang
Summary: Surface enhanced Raman spectroscopy (SERS) was used to evaluate the volatile release of nicotine from snus products under different storage conditions. By comparing the intensities of the spectral peaks of nicotine molecules with increasing temperature and humidity, the nicotine release under different conditions could be evaluated. This study provides valuable reference for understanding the volatile release of nicotine and regulating its levels in snus products, and opens up new perspectives for further research on the impact of nicotinoids on smokers' health and cessation programs.
Review
Materials Science, Multidisciplinary
Weizhen Xu, Boyang Wang, Yadan Zhang, Qingxiao An, Rongju Zhou, Chenzhan Peng, Qinlu Lin, Yanxia Xing
Summary: The article summarizes the unique characteristics and application prospects of gold nanorods in biological detection, emphasizing their importance in targeted detection and medical fields.
MATERIALS RESEARCH EXPRESS
(2021)
Article
Chemistry, Physical
Laura Perez-Martinez, Lisa Balke, Angel Cuesta
Summary: The research indicates that there is competition for adsorption of OH between glycerol and gold oxidation, with glycerol slowing down the formation of gold oxide and gold oxide inhibiting glycerol oxidation. The adsorption of carboxylates leads to a progressive decrease in electrocatalytic activity, but it is an equilibrium process. Therefore, maintaining a high flow rate can keep the inhibition of the reaction at an acceptable level.
JOURNAL OF CATALYSIS
(2021)
Review
Chemistry, Multidisciplinary
Tianyu Li, David A. Harrington
Summary: This review discusses the reaction mechanisms of glycerol electrooxidation, emphasizing the inferiority of Pd compared to Pt electrodes in cleaving glycerol C-C bonds and the reasons for CO2 generation at high overpotentials. A new reaction mechanism is proposed to explain the generation of side products. Additionally, experimental results for Ni electrodes and the performance of multi-metallic electrocatalysts are presented.
Article
Chemistry, Physical
Himanshu Tyagi, Tapaswini Dash, Akash Kumar Maharana, Jyoti Saini, Mamta Raturi, Kiran Shankar Hazra
Summary: This study reports on the sub-band gap excitation in 2D zinc oxide layers covered with gold nanoparticles. The introduction of gold nanoparticles increases the electron availability on the zinc oxide lattice, making excitation in the sub-band gap energy range easier to achieve. The sub-band gap excitation and corresponding emission were observed experimentally and confirmed through surface potential measurements.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Multidisciplinary Sciences
Jing Jiang, Zhen Lu, Jie Shen, Takeshi Wada, Hidemi Kato, Mingwei Chen
Summary: The study reveals that high entropy metallic glasses exhibit a depressed dynamical glass transition phenomenon, with HEMGs having moderate calorimetric T-g showing the highest T-alpha and the maximum activation energy of alpha-relaxation. This decoupling of glass transitions from thermal and mechanical measurements demonstrates the impact of high configurational entropy on the structure and dynamics of supercooled liquids and metallic glasses.
NATURE COMMUNICATIONS
(2021)
Article
Food Science & Technology
Xia Xu, Xiaotian Wu, Yuting Ding, Xuxia Zhou
Summary: The study developed a novel biosensor for the rapid and specific detection of histamine in fish samples, showing great potential for on-site detection of various analytes with high accuracy.
Article
Chemistry, Analytical
Caiyun Yan, Kaifeng Jin, Xiangyi Luo, Jinhua Piao, Fang Wang
Summary: An electrochemical biosensor based on chitosan- and thioctic-acid-modified nanoporous gold was constructed for glycerol determination in wine. The biosensor exhibited a wide determination range, low determination limit, high sensitivity, and good selectivity, repeatability, and stability.
Article
Chemistry, Physical
Robert Smit, Zoran Ristanovic, Boleslaw Kozankiewicz, Michel Orrit
Summary: In this study, a strong excitation-induced reverse intersystem crossing (rISC) phenomenon was discovered for single perylene molecules in a dibenzothiophene matrix, leading to faster recovery from the triplet state and significantly enhanced fluorescence brightness. The intrinsic lifetimes of the two effective triplet states were found to become shorter and fluorescence brightness ultimately increased at least fourfold as excitation power increased. These results are important for understanding triplet state manipulation of single-molecule quantum emitters and improving their brightness.
Article
Nanoscience & Nanotechnology
Gayatri Joshi, Avishek Saha, Arnab Dutta, Saumyakanti Khatua
Summary: Near-infrared (NIR) photon-driven H2 production from water is considered an efficient method for sustainable hydrogen-based energy economy. Researchers have developed a gold nanoprism-based photocatalytic assembly capped with an amine and a silane ligand pair, achieving high H2 production rate and photon-to-hydrogen conversion efficiency. The amine ligand scavenges the hot hole while the silane aids the H2 production via hydrolysis on the plasmon surface. This photocatalytic assembly can serve as a template for large-scale NIR-driven H2 production unit.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Nanoscience & Nanotechnology
Diptiranjan Paital, Varsha Thambi, Mahesh S. Kutwal, Saumyakanti Khatua
Summary: Plasmonic porous Au-Ag nanoparticles show significantly improved catalytic activity in electrochemical and photoelectrochemical methanol oxidation reaction (MOR). The presence of nanopores suppresses poisoning from intermediate species, leading to improved stability. Additionally, the porous nanoparticles exhibit enhanced catalytic activity under visible and near-infrared excitations.
ACS APPLIED NANO MATERIALS
(2022)
Review
Chemistry, Physical
Lars Jeuken, Michel Orrit, Gerard Canters
Summary: Optical studies of redox reactions are non-invasive and can be done in solution or on surfaces, however, complications arise in electrochemistry due to surface effects. These effects impact redox thermodynamics and kinetics, as well as the fluorescent properties of dyes. This article summarizes single-molecule work done on protein molecules and discusses future perspectives.
CURRENT OPINION IN ELECTROCHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Nasrin Asgari, Martin Dieter Baaske, Michel Orrit
Summary: We recorded dark-field scattering bursts of individual gold nanorods in water suspension and deduced their Brownian rotational diffusion constant. The rotational diffusion constants were found to be narrower than expected due to spectral selection by plasmonic resonance. We demonstrated the measurements of hot Brownian rotational diffusion and hydrodynamic volumes of nanorods in temperature and viscosity gradients, as well as the changes in diffusion constant upon polymer binding. This analysis technique can be used for very low concentrations of biomolecules in solution.
Article
Chemistry, Physical
Michel Orrit
Summary: In contrast to ensemble-averaged measurements, single-molecule experiments directly show the heterogeneity of molecular properties in space and time. This phenomenon of dynamic heterogeneity is observed in various complex systems, including single biomolecules, glassy systems, and magnetic relaxation of single superparamagnetic nanoparticles. It suggests that dynamic heterogeneity is the common characteristic in complex systems with multiple degrees of freedom.
JOURNAL OF PHYSICAL CHEMISTRY B
(2023)
Article
Chemistry, Physical
Naveen Kumar, Akanksha Sharma, Archit Bahirat, Gayatri Joshi, Saumyakanti Khatua
Summary: In this study, a novel strategy for near-infrared (NIR) photon-to-hydrogen conversion was developed, which does not require external electric bias or sacrificial chemicals. The strategy utilized a plasmonic substrate containing gold nanoprisms to drive the photocatalytic Si-H activation in water, producing hydrogen and silanol. The photocatalytic substrate exhibited excellent photon-to-hydrogen conversion efficiency of 0.85-1.45% for wavelengths between 1000 and 1700 nm, and hydrogen production rate of 132 μL min(-1) mg(-1) Au. The simplicity, scalability, and high photon-to-hydrogen production efficiency of our strategy make it highly relevant for applications in the alternative energy sector.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Yonghui Wang, Subhasis Adhikari, Harmen van der Meer, Junyan Liu, Michel Orrit
Summary: Photothermal (PT) microscopy has great potential in imaging single absorbing nano-objects in soft matter and biological systems. In this study, we showed that the photothermal signal can be significantly enhanced by near-critical CO2, a cheaper alternative to xenon. The use of thin capillaries and COMSOL simulations further supported our experimental findings.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Nanoscience & Nanotechnology
S. Adhikari, J. Li, Y. Wang, L. Ruijs, J. Liu, B. Koopmans, M. Orrit, R. Lavrijsen
Summary: The magnetization switching of synthetic antiferromagnetic nanoplatelets (SAF-PMA NPs) was studied using a single-particle optical technique. The results showed the spatial and temporal heterogeneity of magnetic switching fields at the single-particle level. This research provides important insights into the dynamic torque transfer in biomedical and microfluidic applications.
Article
Chemistry, Physical
Ashish Kar, N. V. S. Praneeth, Saumyakanti Khatua, Bhaskar Datta
Summary: Single-molecule measurements are used to study the interactions between G-quadruplex (GQ) DNA and ligands. Plasmon-enhanced fluorescence is employed to investigate the real-time interaction between the cationic porphyrin ligand TmPyP4 and different topologies of telomeric GQ DNA at the single-molecule level. The dwell times for the ligand are extracted from the fluorescence bursts, and different dwell time distributions are observed for parallel and antiparallel telomeric GQ DNA.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Physical
Yonghui Wang, Subhasis Adhikari, Harmen van der Meer, Junyan Liu, Michel Orrit
Summary: Photothermal (PT) microscopy has shown great potential in imaging single absorbing nano-objects in soft matter and biological systems. By confining near-critical CO2 in a thin capillary, we were able to enhance PT signals, making it a cheaper alternative to xenon. In addition, we demonstrated the enhancement of the magnetic circular dichroism signal of single magnetite nanoparticle clusters in supercritical CO2.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Gayatri Joshi, Rajesh Kashyap, Kalyani Patrikar, Anirban Mondal, Saumyakanti Khatua
Summary: This study demonstrates that utilizing covalently bound surface-coating ligands with suitable orbital alignment can provide electron transport channels, boosting hot electron extraction from gold nanostructures and significantly enhancing the rate of hydrogen evolution reaction under near-infrared excitation.
Article
Chemistry, Multidisciplinary
Gayatri Joshi, Rajesh Kashyap, Kalyani Patrikar, Anirban Mondal, Saumyakanti Khatua
Summary: Photoexcitation of noble metal nanoparticles generates surface plasmons that can initiate and accelerate chemical reactions. However, the efficiency is limited by the recombination of charge carriers. Designing nanostructures that promote charge separation and transport is crucial for efficient utilization of these carriers. We demonstrate that covalently bound surface-coating ligands can enhance the extraction of hot electrons from a gold nanostructure, leading to a significant increase in the rate of photocatalytic hydrogen evolution reaction.
Article
Materials Science, Biomaterials
Jaypalsing Ingle, Bhawna Uttam, Reha Panigrahi, Saumyakanti Khatua, Sudipta Basu
Summary: A dog-bone shaped gold nanoparticle was engineered to induce mitochondrial impairment and apoptotic cancer cell death, opening a new direction for organelle-targeted cancer therapy.
JOURNAL OF MATERIALS CHEMISTRY B
(2023)
Article
Chemistry, Multidisciplinary
Xuxing Lu, Deep Punj, Michel Orrit
Summary: This study demonstrates two methods for synthesizing gold nanorod dimers and shows that these dimers can be used to enhance two-photon-excited fluorescence signals.
