In Situ Spectroscopic Probes for Structures and Processes at the Surface of Noble Metallic Nanoparticles

2021 ◽  
pp. 2000316
Author(s):  
Shan Xue ◽  
Pritam Guha ◽  
Qunhui Yuan ◽  
Wei Gan
Keyword(s):  
Metallic Nanoparticles ◽  
Spectroscopic Probes

Incessant and economical technique for in-situ preparation of metallicnano on/in polyester fabric

2021 ◽  
Vol 64 (2) ◽  
pp. 68-70
Author(s):  
Satyajeet B. Chaudhari ◽  
Bharat H. Patel ◽  
Aadhar A. Mandot
Keyword(s):  
Metal Ion ◽  
Metallic Nanoparticles ◽  
Room Temperature ◽  
Polyester Fabric ◽  
Atmospheric Conditions ◽  
Spherical Nanoparticles ◽  
In Situ Preparation

Composite textiles consisting of metallic nanoparticles dispersed in textiles fabric have been prepared by the reduction of metal ion from its salt at room temperature under normal atmospheric conditions. Morphology and structures have been investigated by SEM. Spherical nanoparticles were found to be homogeneously dispersed in/on the polyester (PET) fiber and the particles were elementally analyzed by the XRF technique.

Liquid Spreading Induced by In Situ Generation of Metallic Nanoparticles

Langmuir ◽  
2020 ◽  
Vol 36 (41) ◽  
pp. 12237-12246
Author(s):  
Nitish Singh ◽  
Yashaswini Jain ◽  
Kaushal Kishore ◽  
Animangsu Ghatak
Keyword(s):  
Metallic Nanoparticles ◽  
Liquid Spreading ◽  
In Situ Generation

scholarly journals Metal oxide and bimetallic nanoparticles in ionic liquids: synthesis and application in multiphase catalysis

2013 ◽  
Vol 2 (5) ◽  
pp. 577-595 ◽  
Author(s):  
Martin H.G. Prechtl ◽  
Paul S. Campbell
Keyword(s):  
Ionic Liquids ◽  
Metal Oxide ◽  
Metallic Nanoparticles ◽  
Bimetallic Nanoparticles ◽  
Synthetic Methods ◽  
Supramolecular Organization ◽  
Stabilizing Agents ◽  
Bimetallic Alloy ◽  
Current State

AbstractIonic liquids (ILs) are well established as solvents and stabilizing agents for the synthesis of metallic nanoparticles (NPs) in general. The physicochemical properties of ILs and the supramolecular organization in the liquid state are capable of directing the growth of transition metal NPs generated in situ and to subsequently protect and stabilize them. Until now, many different NPs have been successfully synthesized within these media; however, the synthesis of metal oxide and bimetallic alloy or core-shell NPs in ILs is still relatively rare. Herein, we summarize the current state-of-the-art of the synthetic methods for these materials and their application in the broad field of catalysis, including multiphase systems, hydrogenation, dehydrogenation, functionalization, as well as defunctionalization reactions.

Growth and Characterization of Cobalt-filled Carbon Nanotubes Prepared by a Simple Catalytic Method

2003 ◽  
Vol 776 ◽  
Author(s):  
Xicheng Ma ◽  
Yuanhua Cai ◽  
Xia Li ◽  
Ning Lun ◽  
Shulin Wen
Keyword(s):  
Carbon Nanotubes ◽  
Metallic Nanoparticles ◽  
Low Cost ◽  
Catalytic Method ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
High Resolution Tem ◽  
One Step

AbstractHigh-quality cobalt-filled carbon nanotubes (CNTs) were prepared in situ in the decomposition of benzene over Co/silica-gel nano-scale catalysts. Unlike the previous reports, the catalysts needn't be pre-reduced prior to the forming of Co-filled CNTs, thus the advantage of this method is that Co-filled CNTs can be produced in one step, at a relatively low cost. Transmission electron microscopy (TEM) investigation showed that the products contained abundance of CNTs and most of them were filled with metallic nanoparticles or nanorods. High-resolution TEM (HRTEM), selected area electron diffraction (SAED) patterns and energy dispersive X-ray spectroscopy (EDS) confirmed the presence of Co inside the nanotubes. The encapsulated Co was further identified always as high temperature alpha-Co phase with fcc structure, which frequently consists of twinned boundaries and stacking faults. Based on the experimental results, a possible growth mechanism of the Co-filled CNTs was proposed.

In Situ Synthesis and Immobilization of Metallic Nanoparticles on a Calixarene Monolayer

Langmuir ◽  
2013 ◽  
Vol 29 (42) ◽  
pp. 13042-13049 ◽  
Author(s):  
Ruitao Zhou ◽  
M. P. Srinivasan
Keyword(s):  
Metallic Nanoparticles ◽  
In Situ Synthesis

A dispenser–reactor apparatus applied forin situXAS monitoring of Pt nanoparticle formation

2015 ◽  
Vol 22 (3) ◽  
pp. 736-744 ◽  
Author(s):  
Jocenir Boita ◽  
Marcus Vinicius Castegnaro ◽  
Maria do Carmo Martins Alves ◽  
Jonder Morais
Keyword(s):  
Photoelectron Spectroscopy ◽  
Metallic Nanoparticles ◽  
Pt Nanoparticles ◽  
Lattice Parameter ◽  
X Ray Diffraction ◽  
Time Resolved ◽  
X Ray ◽  
Two Stages ◽  
X Ray Absorption

In situtime-resolved X-ray absorption spectroscopy (XAS) measurements collected at the PtL3-edge during the synthesis of Pt nanoparticles (NPs) in aqueous solution are reported. A specially designed dispenser–reactor apparatus allowed for monitoring changes in the XAS spectra from the earliest moments of Pt ions in solution until the formation of metallic nanoparticles with a mean diameter of 4.9 ± 1.1 nm. By monitoring the changes in the local chemical environment of the Pt atoms in real time, it was possible to observe that the NPs formation kinetics involved two stages: a reduction-nucleation burst followed by a slow growth and stabilization of NPs. Subsequently, the synthesized Pt NPs were supported on activated carbon and characterized by synchrotron-radiation-excited X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and extended X-ray absorption fine structure (EXAFS). The supported Pt NPs remained in the metallic chemical state and with a reduced size, presenting slight lattice parameter contraction in comparison with the bulk Pt values.

Silver Nanoparticles - Graphene Oxide Nanocomposite for Antibacterial Purpose

2011 ◽  
Vol 364 ◽  
pp. 439-443 ◽  
Author(s):  
Soon Wei Chook ◽  
Chin Hua Chia ◽  
Zakaria Sarani ◽  
Mohd Khan Ayob ◽  
Kah Leong Chee ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Graphene Oxide ◽  
Metallic Nanoparticles ◽  
Biomedical Applications ◽  
Food Packaging ◽  
Single Layer ◽  
In Situ Synthesis ◽  
Graphene Oxide Sheets

Graphene oxide (GO) sheets, a single layer of carbon atoms which can be served as substrates for fabricating metallic nanoparticles-GO nanocomposites. In this study, the nanocomposite of silver nanoparticles and graphene oxide were produced via in-situ synthesis and with the addition of chitosan to investigate the formation of silver nanoparticles on the graphene oxide sheets. XRD and UV-Vis studies confirmed the formation of silver nanoparticles on GO sheets, while TEM and FESEM images presented the loading of silver nanoparticles on the GO sheets. The degree of loading and distribution of the silver nanoparticles on the graphene oxide were depend on the method during the formation of silver nanoparticles. The nanocomposites can be potentially used in food packaging and biomedical applications.

scholarly journals In Situ Quantification of Polyhydroxybutyrate in Photobioreactor Cultivations of Synechocystis sp. Using an Ultrasound-Enhanced ATR-FTIR Spectroscopy Probe

2021 ◽  
Vol 8 (9) ◽  
pp. 129
Author(s):  
Philipp Doppler ◽  
Christoph Gasser ◽  
Ricarda Kriechbaum ◽  
Ardita Ferizi ◽  
Oliver Spadiut
Keyword(s):  
Process Analytical Technology ◽  
Attenuated Total Reflection ◽  
Monitoring Tool ◽  
Biotechnological Production ◽  
Promising Alternative ◽  
Production Processes ◽  
Spectroscopic Probes ◽  
Phb Production ◽  
Analytical Technology

Polyhydroxybutyrate (PHB) is a very promising alternative to most petroleum-based plastics with the huge advantage of biodegradability. Biotechnological production processes utilizing cyanobacteria as sustainable source of PHB require fast in situ process analytical technology (PAT) tools for sophisticated process monitoring. Spectroscopic probes supported by ultrasound particle traps provide a powerful technology for in-line, nondestructive, and real-time process analytics in photobioreactors. This work shows the great potential of using ultrasound particle manipulation to improve spectroscopic attenuated total reflection Fourier-transformed mid-infrared (ATR-FTIR) spectra as a monitoring tool for PHB production processes in photobioreactors.

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