Article
Optics
Pierre Lassegues, Mateus Antonio Fernandes Biscassi, Martial Morisse, Andre Cidrim, Pablo Gabriel Santos Dias, Hodei Eneriz, Raul Celistrino Teixeira, Robin Kaiser, Romain Bachelard, Mathilde Hugbart
Summary: This study reports on the transition from a thermal to a spontaneous emission mechanism for the loss of light temporal coherence from a macroscopic atomic cloud, exploring the process by tuning the pump strength at different temperatures.
Article
Multidisciplinary Sciences
Yogesh Dadhich, Nazek Alessa, Reema Jain, Abdul Razak Kaladgi, Karuppusamy Loganathan, V. Radhika Devi
Summary: The current study investigates the thermally radiative flow of Jeffrey nanofluid over a stretching wedge, considering the Brownian motion and thermophoresis effects. The governing partial differential equations are transformed into non-dimensional ordinary differential equations using symmetry variables. The MATLAB function bvp4c is utilized to solve the resulting ODEs. The impacts of different flow variables on heat transfer, temperature, mass, velocity, and nanoparticle concentration are examined.
Article
Optics
Yi Peng, Jian Qiu, Li Peng, Kaiqing Luo, Dongmei Liu, Peng Han
Summary: In this paper, a criterion is proposed to determine the wave vector range for the image method of heterodyne near-field light scattering. The criterion analyzes the hologram of the particles to extract particle dynamics, and its effectiveness is verified.
Article
Thermodynamics
Yogesh Dadhich, Reema Jain, Abdul Razak Kaladgi, Mamdooh Alwetaishi, Asif Afzal, C. Ahamed Saleel
Summary: The study focuses on magnetohydrodynamic flow, heat, and mass transfer in radiated Jeffery fluid containing nanoparticles. Utilizing MATLAB algorithm for numerical analysis, the impacts of various physical parameters are discussed through graphs and tables.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Chemistry, Physical
Hamid Loulijat, Hassane Moustabchir
Summary: This paper presents the study of nanoscale mechanisms and their effects on shear viscosity enhancement in nanofluid through equilibrium molecular dynamics simulation. The results reveal the contribution of Brownian motion of gold nanoparticles and interfacial layer at water-gold interface to shear viscosity enhancement.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Optics
Wonhyuk Jo, Rustam Rysov, Fabian Westermeier, Michael Walther, Leonard Mueller, Andre Philippi-Kobs, Matthias Riepp, Simon Marotzke, Irina Lokteva, Michael Sprung, Gerhard Gruebel, Wojciech Roseker
Summary: This paper presents a proof-of-principle study of three-dimensional photon correlation spectroscopy (3D PCS) in the hard X-ray regime. By employing an X-ray optical cross-correlator, the dynamics of silica colloidal nanoparticles dispersed in polypropylene glycol were measured. The obtained cross correlation functions showed excellent agreement with auto-correlation measurements. This demonstration lays the foundation for X-ray speckle-based studies of densely packed soft matter systems.
Article
Physics, Multidisciplinary
Sohail A. Khan, T. Hayat, A. Alsaedi
Summary: This study investigates the MHD stagnation point flow of Jeffrey nanomaterials towards a stretching sheet, using the OHAM method to obtain convergent solutions and discussing the effects of various variables on temperature, velocity, and concentration. The results show that velocity is influenced by relaxation and retardation times parameters, higher magnetic variable reduces velocity, higher Eckert number increases temperature, larger Schmidt number leads to concentration decay, and thermophoresis and Brownian motion have opposite effects on concentration distribution.
CHINESE JOURNAL OF PHYSICS
(2022)
Review
Chemistry, Multidisciplinary
Maozhong Sun, Xiuxiu Wang, Xiao Guo, Liguang Xu, Hua Kuang, Chuanlai Xu
Summary: This review summarizes the principles and fabrication strategies of chiral nanomaterials, and discusses their applications in bioscience. The optical activity of these materials can be controlled using external fields, and they have great potential for various applications.
Article
Mathematics
Mark Peletier, Nir Gavish, Pierre Nyquist
Summary: In this study, we investigate a one-dimensional system of hard rods and prove a large-deviation principle for the empirical measure of the rod positions. We find that the limit evolution of the system exhibits a gradient-flow structure with an entropy-like driving functional and Wasserstein dissipation. This research has important implications for the modeling of interacting particle systems with finite-size effects.
POTENTIAL ANALYSIS
(2023)
Article
Biology
Manas Mondal, Srabani Chakrabarti, Yi Qin Gao, Dhananjay Bhattacharyya, Jaydeb Chakrabarti
Summary: This study investigates the indoor propagation of airborne diseases through a microscopic model of virus particles in respiratory microdroplets. The motion of the virus particles is influenced by various forces, including air flow from indoor air conditioning, gravity, viscous drag, interfacial tension, thermal forces, and interaction forces with other viral particles. The simulations and scaling analysis reveal the time it takes for a droplet to reach the ground and the distance it propagates horizontally from the source. This research provides insights into the long-distance transmission of airborne respiratory droplets in indoor conditions.
COMPUTATIONAL BIOLOGY AND CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Xuewen Fu, Siyu Liu, Bin Chen, Jau Tang, Yimei Zhu
Summary: Studying the superfast unidirectional ballistic dynamics of individual nanoparticles along the liquid-gas interface and manipulating them using four-dimensional electron microscopy. Experimental results show that nanoparticles exhibit continuous superfast unidirectional translation upon repetitive femtosecond laser excitation, driven by unidirectional random impulsive forces induced by nanobubbles, which can be controlled by tuning laser characteristics. This directional plasmonic NB-propulsion mechanism provides insights for the design of light-controllable artificially intelligent micro/nanomotor systems.
Article
Mathematics, Applied
A. D. A. M. BOBROWSKI, T. O. M. A. S. Z. KOMOROWSKI
Summary: This paper studies a diffusion approximation for a model of stochastic motion of a particle in one spatial dimension. The direction of the particle's motion undergoes random changes with a Poisson clock, and it interacts with an interface that can reflect, transmit, or kill the particle with probabilities depending on its arrival direction. The study proves that if the probability of killing is positive, the limit process is a minimal Brownian motion. In the case of no killing, the limit is a skew Brownian motion. The paper also introduces a cosine family related to the skew Brownian motion and provides a new derivation of transition probability densities for this process.
JOURNAL OF EVOLUTION EQUATIONS
(2022)
Article
Chemistry, Physical
Mohsen Sadeghi, Frank Noe
Summary: This study introduces a framework based on anisotropic Langevin dynamics to model hydrodynamic effects in biological membrane systems. Friction and diffusion tensors are obtained analytically or semi-analytically to accurately describe in-plane and out-of-plane flow dynamics. The method provides insights into dispersion relations of planar membrane patches and discusses the impact of hydrodynamic interactions on non-equilibrium dynamics and surface viscosity of the model membrane.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Polymer Science
Janine L. Thoma, Jean Duhamel
Summary: Four polymeric bottle brushes with PyEG y side chains were synthesized and their conformation was evaluated through fluorescence measurements in different solvents. Solvent-induced differences in excimer formation efficiency were observed, leading to a direct relationship between the efficiency and local pyrene concentration, which can be used to probe the conformation of highly branched macromolecules in solution.
Article
Geochemistry & Geophysics
Gerardo Di Martino, Alessio Di Simone, Antonio Iodice
Summary: This paper proposes an analytical formulation to describe the normalized radar cross section (NRCS) of anisotropic power-law spectrum surfaces using the theory of fractional Brownian motion (fBm). The obtained results are compared with measured NRCSs and results obtained via numerical integration methods, demonstrating the accuracy and effectiveness of the proposed formulation.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2023)
Article
Chemistry, Multidisciplinary
Bing Ni, Mikhail Mychinko, Sergio Gomez-Grana, Jordi Morales-Vidal, Manuel Obelleiro-Liz, Wouter Heyvaert, David Vila-Liarte, Xiaolu Zhuo, Wiebke Albrecht, Guangchao Zheng, Guillermo Gonzalez-Rubio, Jose M. Taboada, Fernando Obelleiro, Nuria Lopez, Jorge Perez-Juste, Isabel Pastoriza-Santos, Helmut Coelfen, Sara Bals, Luis M. Liz-Marzan
Summary: A chiral growth method using cysteine as a dissymmetry inducer was developed to prepare gold nanorods with twisted morphology. Electron microscopy analysis suggests that the dissymmetry is caused by the development of chiral facets on the initial nanorods, resulting in a twisted shape. Cysteine plays a crucial role in assisting the enantioselective facet evolution, leading to the formation of highly chiral morphology with significant plasmonic optical activity.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Javier Plou, Pablo S. Valera, Isabel Garcia, David Vila-Liarte, Carlos Renero-Lecuna, Jesus Ruiz-Cabello, Arkaitz Carracedo, Luis M. Liz-Marzan
Summary: During the response to stress, damaged cells release metabolites and secretomes, which can be utilized in anticancer therapies and biomarker predictions. However, monitoring these processes is challenging, leading to the development of noninvasive secretome screening tools. Machine learning methods and microfluidic chips were used to identify secretome variations and classify cell death, allowing for faster implementation of surface-enhanced Raman scattering (SERS) into cell secretome classification.
Article
Chemistry, Multidisciplinary
Xing Liu, Yanli Du, Shenli Wang, Yu Huang, Yongzhi Tian, Daniel Garcia-Lojo, Ignacio Perez-Juste, Jorge Perez-Juste, Isabel Pastoriza-Santos, Guangchao Zheng
Summary: This article investigates the synthesis of chiral cobalt oxide nanoparticles mediated by histidine and discovers their unique and tunable chiroptical properties. The analysis indicates that the ratio of Co2+/Co3+ and their interactions with the imidazole groups of histidine are behind their chiral properties. Furthermore, the study demonstrates the use of chiral cobalt oxide nanoparticles for the development of sensitive and enantioselective circular dichroism-based sensors.
Article
Polymer Science
Chris Vanheusden, Jan Vanminsel, Naveen Reddy, Pieter Samyn, Jan D'Haen, Roos Peeters, Anitha Ethirajan, Mieke Buntinx
Summary: Biobased and biodegradable polyhydroxyalkanoates (PHAs) are gaining popularity. Poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHHx) polymer has a processing window suitable for packaging, agricultural, and fishery applications. Centrifugal fiber spinning (CFS) is a promising technique to produce PHBHHx fibers with tunable morphology and properties. CFS can create beads and continuous fibers based on the polymer concentration, and thermal post-processing can further enhance the fibers' mechanical properties.
Article
Materials Science, Multidisciplinary
Manuel Obelleiro-Liz, Victor F. Martin, Diego M. Solis, Jose M. Taboada, Fernando Obelleiro, Luis M. Liz-Marzan
Summary: Chiral metal nanoparticles can induce and harness optical activity, but there is limited control over their morphological detail and resulting optical activity due to incomplete knowledge of growth mechanisms. This study uses computer-aided design and simulations to analyze the influence of structural changes on the plasmonic circular dichroism spectra of rod-shaped gold nanoparticles. Interesting patterns in plasmon-mediated resonant behavior are identified, which can guide the understanding and fabrication of these nanoparticles for applications such as spectroscopic detection and surface-enhanced Raman optical activity.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Evgenii Vlasov, Alexander Skorikov, Ana Sanchez-Iglesias, Luis M. Liz-Marzan, Johan Verbeeck, Sara Bals
Summary: Electron tomography (ET) is a powerful tool for determining the 3D structure of nanomaterials, but it is time-consuming. Surface-sensitive secondary electron (SE) imaging, using the SE electron beam induced current (SEEBIC) technique, is proposed as an alternative to ET for studying nanomaterial morphology. SEEBIC imaging provides valuable information with high spatial resolution and shorter throughput times compared to ET. The contrast formation mechanisms that aid in interpreting SEEBIC data are also discussed.
ACS MATERIALS LETTERS
(2023)
Editorial Material
Chemistry, Multidisciplinary
Warren C. W. Chan, Natalie Artzi, Chunying Chen, Xiaodong Chen, Dean Ho, Tony Hu, Kazunori Kataoka, Luis M. Liz-Marzan, Rahmi Oklu, Wolfgang J. Parak
Article
Chemistry, Physical
Xiaolu Zhuo, David Vila-Liarte, Shengyan Wang, Dorleta Jimenez de Aberasturi, Luis M. Liz-Marzan
Summary: A study on the stability of chiral gold nanorods (Au NRs) covered by different protecting shells was conducted. The findings can be applied to other chiral plasmonic nanoparticles and address concerns of instability in various applications.
CHEMISTRY OF MATERIALS
(2023)
Editorial Material
Chemistry, Physical
Galo J. A. A. Soler-Illia, Marco Faustini, Luis M. Liz-Marzan
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Physical
Jiaoyang Sa, Ningneng Hu, Wouter Heyvaert, Kyle Van Gordon, Hao Li, Le Wang, Sara Bals, Luis M. Liz-Marzan, Weihai Ni
Summary: Chiral ligands are necessary for the synthesis of dissymmetric plasmonic metal nanocrystals. However, chirality can also spontaneously evolve during the co-deposition of Au and Ag on Au nanorods. The presence of a specific Au/Ag ratio leads to phase segregation, forming an interface within the AuAg shell. Chirality is observed both at the Au-Ag interface and at the exposed surface of Au nanorods after Ag etching.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Carlos Fernandez-Lodeiro, Reem Tambosi, Javier Fernandez-Lodeiro, Adrian Fernandez-Lodeiro, Silvia Nuti, Soufian Ouchane, Nouari Kebaili, Jorge Perez-Juste, Isabel Pastoriza-Santos, Carlos Lodeiro
Summary: In this study, a novel approach for silica coating of silver nanoparticles using adenosine monophosphate (AMP) surface modification was proposed. The thickness of the silica coating could be tightly adjusted by varying the silica precursor or CTAC concentration. The study also revealed the influence of silica coating on the antimicrobial effect of AgNPs and investigated different bacterial growth conditions.
Article
Nanoscience & Nanotechnology
Samuel Thomas Holder, Carla Estevez-Varela, Isabel Pastoriza-Santos, Martin Lopez-Garcia, Ruth Oulton, Sara Nunez-Sanchez
Summary: Light-harvesting complexes in natural photosynthetic systems, such as those in purple bacteria, consist of photo-reactive chromophores embedded in densely packed antenna systems. Inspired by the molecular composition of such biological systems, we create a library of organic materials composed of densely packed J-aggregates in a polymeric matrix. These organic materials show polaritonic properties that can be tuned from visible to infrared.
Article
Chemistry, Physical
Alina Arslanova, Ine Matthe, Olivier Deschaume, Carmen Bartic, Wouter Monnens, Erwin Konrad Reichel, Naveen Reddy, Jan Fransaer, Christian Clasen
Summary: The motion of self-propelling microswimmers is affected by liquid-liquid interfaces (LLI), which can enhance or reduce their mobility and also steer the direction of their propulsion. In this study, the adsorption and motion of bimetallic Janus sideways propelled rods were studied at the interface between an aqueous solution of hydrogen peroxide and oil. It was found that the wetting properties of the rods result in a wide distribution of their velocities at the LLI, with a significant enhancement of motility compared to near a solid wall.
Article
Chemistry, Multidisciplinary
Carla Estevez-Varela, Sara Nunez-Sanchez, Paula Pineiro-Varela, Dorleta Jimenez de Aberasturi, Luis M. Liz-Marzan, Jorge Perez-Juste, Isabel Pastoriza-Santos
Summary: Plexcitonic nanoparticles, which exhibit strong light-matter interactions, have been investigated using UV-visible and SERS spectroscopies, supported by FDTD calculations in this study. The combination of plasmonic nanomaterials and J-aggregates is found to be crucial, with the refractive index contrast between water and the TDBC shell playing a significant role in the observed SERS efficiency.