Real-time in situ visualization of internal relative humidity in fluorescence embedded cement-based materials

2021 ◽  
Author(s):  
Hai-tao Gu ◽  
Zheng-hong Yang ◽  
Zhen Fan ◽  
Wei Jiang
Keyword(s):  
Relative Humidity ◽  
Real Time ◽  
Cement Based Materials ◽  
In Situ Visualization ◽  
Internal Relative Humidity

In-Situ Visualization of Evaporation Induced Self-Assembly Phenomena of Nanofluids Detecting the Interfacial Surface Plasmon Reflectance

2015 ◽  
Author(s):  
Iltai (Isaac) Kim ◽  
Kenneth David Kihm
Keyword(s):  
Refractive Index ◽  
Real Time ◽  
Surface Plasmon ◽  
Self Assembly ◽  
Effective Refractive Index ◽  
In Situ Visualization ◽  
Evaporation Induced Self Assembly ◽  
Self Assembled ◽  
Mapping Techniques

Innovative optical techniques based on nano-biophotonics such as surface plasmon resonance (SPR) imaging and R-G-B natural fringe mapping techniques are developed to characterize the transport and optical properties of nanofluids in situ, real-time, and full field manner. Recent results regarding the characterization of nanofluids are summarized and future research directions are presented. 47 nm Al2O3 nanoparticles are dispersed in water with various concentrations. Al2O3 nanofluids droplets are placed on substrates and evaporated in room temperature. In-situ visualization of evaporation-induced self-assembly is conducted to detect concentration, effective refractive index, and different self-assembled pattern including cavity with various nanofluids concentrations and surface hydrophobbicities with SPR and fringe mapping. During the evaporation, time-dependent and near-field nanoparticle concentrations are determined by correlating the SPR reflectance intensities with the effective refractive index (ERI) of the nanofluids. With increasing the concentrations of nanofluids, the existence of hidden complex cavities inside a self-assembled nanocrystalline structure or final dryout pattern is discovered in real-time. R-G-B natural fringe mapping allowed the reconstruction of the 3D cavity formation and crystallization processes quantitatively. The formation of the complex inner structure was found to be attributable to multiple cavity inceptions and their competing growth during the aquatic evaporation. Furthermore, the effect of surface hydrophobicity is examined in the formation of hidden complex cavities, taking place on three different substrates bearing different levels of hydrophobicity; namely, cover glass (CG), gold thin film (Au), and polystyrene dish (PS). These surface plamson resonance imaging and natural fringe mapping techniques are expected to provide a breakthrough in micro-nanoscale thermal fluids phenomena and nano-biochemical sensing when coupled with localized surface Plasmon and metamaterials techniques.

Measurement of the Internal Relative Humidity Distribution in Concrete

2010 ◽  
Vol 163-167 ◽  
pp. 1409-1413 ◽  
Author(s):  
Ji Kai Zhou ◽  
Xu Dong Chen ◽  
Jian Zhang ◽  
Xiao Wei Kan
Keyword(s):  
Relative Humidity ◽  
Significant Influence ◽  
Measurement System ◽  
External Environment ◽  
Measuring Method ◽  
Test Results ◽  
Moisture Contents ◽  
Cement Based Materials ◽  
Predrilled Hole ◽  
Internal Relative Humidity

The internal relative humidity (RH) and humidity gradients in concrete at early ages have a significant influence upon the properties of concrete, where exists a great discrepancy among the test results under different methods. By comparing and analyzing the traditional measuring methods of the RH in concrete, a new measuring method will be developed in this study, which could measure the internal RH in cement-based materials accurately, conveniently and digitally. The changing laws of the internal RH in concrete at early ages were discussed. The results indicate that the measuring results under the new developed system was more accurate than that by the predrilled hole method, while the external environment does not have any effect on the measured results obtained by using the new measurement system. What’s more, the results achieved by the new developed system approached the real RH in concrete very quickly; the RH near the surface of the specimen decreased quickly, while the RH in the center of the specimen decreased slowly, the moisture contents unevenly distributed through the various height of the specimen. Hence, there exists an obvious humidity gradient in concrete.

Atmospheric Probe for Real Time Weather Monitoring

2017 ◽  
Vol 2017 (1) ◽  
pp. 000280-000285
Author(s):  
J. Craig Prather ◽  
Michael Bolt ◽  
Haley Harrell ◽  
Tyler Horton ◽  
John Manobianco ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Relative Humidity ◽  
Real Time ◽  
Base Station ◽  
Gps Receiver ◽  
Time Analysis ◽  
Atmospheric Measurements ◽  
Real Time Analysis ◽  
Manufacturing Techniques

Abstract This work outlines the development and testing of novel in-situ atmospheric sensors. The system is designed for deployment of the sensors en masse to increase the geospatial density of atmospheric measurements. This sensor system is being designed to replace the costly, larger atmospheric sensors currently in use. Improvement in sensor technologies, substrates, and additive manufacturing techniques have allowed for such a device to be realizable. The devices contain a sensor suite that gathers temperature, relative humidity, and pressure from microsensors as well as position, velocity, and heading from a compact GPS receiver. This data is then sent to a base station for analysis by atmospheric scientists, with the potential for real time analysis.

Real-Time Fluorescence In Situ Visualization of Latent Fingerprints Exceeding Level 3 Details Based on Aggregation-Induced Emission

2020 ◽  
Vol 142 (16) ◽  
pp. 7497-7505 ◽  
Author(s):  
Ya-Long Wang ◽  
Chong Li ◽  
Hong-Qing Qu ◽  
Cheng Fan ◽  
Peng-Ju Zhao ◽  
...  
Keyword(s):  
Real Time ◽  
Latent Fingerprints ◽  
Aggregation Induced Emission ◽  
In Situ Visualization ◽  
Level 3

scholarly journals Single-Shot Multicontrast X-ray Imaging for In Situ Visualization of Chemical Reaction Products

2021 ◽  
Vol 7 (11) ◽  
pp. 221
Author(s):  
Margarita Zakharova ◽  
Andrey Mikhaylov ◽  
Vitor Vlnieska ◽  
Danays Kunka
Keyword(s):  
Real Time ◽  
Chemical Reaction ◽  
Single Shot ◽  
Reaction Products ◽  
Time Resolved ◽  
X Ray ◽  
X Ray Imaging ◽  
In Situ Visualization ◽  
Different Time Scales

We present the application of single-shot multicontrast X-ray imaging with an inverted Hartmann mask to the time-resolved in situ visualization of chemical reaction products. The real-time monitoring of an illustrative chemical reaction indicated the formation of the precipitate by the absorption, differential phase, and scattering contrast images obtained from a single projection. Through these contrast channels, the formation of the precipitate along the mixing line of the reagents, the border between the solid and the solution, and the presence of the scattering structures of 100–200 nm sizes were observed. The measurements were performed in a flexible and robust setup, which can be tailored to various imaging applications at different time scales.

Echtzeitnahe Simulation mit in-situ Visualisierung*/Near Real-time simulation with in-situ visualization

2019 ◽  
Vol 109 (03) ◽  
pp. 163-167
Author(s):  
A. Bruns ◽  
T. Schlegel ◽  
M. Lickefett ◽  
J. Siegert
Keyword(s):  
Real Time ◽  
Digital Image ◽  
Material Flow ◽  
Assembly Line ◽  
Flow Simulation ◽  
Industrie 4.0 ◽  
Time Simulation ◽  
In Situ Visualization ◽  
Factory Layout

Die hier dargestellten Arbeiten wurden im Applikationszentrum Industrie 4.0 als ein Teil des Showcases „Autonome Produktion“ durchgeführt. Das Fraunhofer IPA und das IFF haben gemeinsam eine echtzeitnahe Materialflusssimulation mit in-situ Visualisierung entwickelt, die automatisch ein digitales Abbild der Produktion am Beispiel einer verketteten Montagelinie erzeugt und über eine Deckeninstallation aus 6x2 Projektoren auf den Hallenboden projiziert. Durch diese in-situ Visualisierung können Abweichungen vom geplanten Ablauf in Echtzeit sichtbar gemacht, Probleme behoben und Stillstandszeiten verringert werden, bevor sie auftreten.   The work presented in this article was carried out in the Application Center for Industrie 4.0 as part of the showcase “Autonomous Production“. The IPA and IFF have jointly developed a material flow simulation close to real-time with in-situ visualization that automati cally generates a digital image of the production (e.g., a chained assembly line) and projects a 2D factory layout onto the floor using a 6x2 projector ceiling installation. In-situ visualization makes it possible to visualize the need for optimization and the prognosis of disruptive effects in the simulation model in real-time. Problems can be solved before they occur and downtime can be reduced.

Probing the Dynamic Self-Assembly Behaviour of Photoswitchable Wormlike Micelles in Real Time

2018 ◽  
Author(s):  
Elaine A. Kelly ◽  
Judith E. Houston ◽  
Rachel Evans
Keyword(s):  
Real Time ◽  
Absorption Spectroscopy ◽  
Self Assembly ◽  
Uv Light ◽  
Wormlike Micelles ◽  
Tetraethylene Glycol ◽  
Light Illumination ◽  
First Time ◽  
Dependent Processes

Understanding the dynamic self-assembly behaviour of azobenzene photosurfactants (AzoPS) is crucial to advance their use in controlled release applications such as<i></i>drug delivery and micellar catalysis. Currently, their behaviour in the equilibrium <i>cis-</i>and <i>trans</i>-photostationary states is more widely understood than during the photoisomerisation process itself. Here, we investigate the time-dependent self-assembly of the different photoisomers of a model neutral AzoPS, <a>tetraethylene glycol mono(4′,4-octyloxy,octyl-azobenzene) </a>(C<sub>8</sub>AzoOC<sub>8</sub>E<sub>4</sub>) using small-angle neutron scattering (SANS). We show that the incorporation of <i>in-situ</i>UV-Vis absorption spectroscopy with SANS allows the scattering profile, and hence micelle shape, to be correlated with the extent of photoisomerisation in real-time. It was observed that C<sub>8</sub>AzoOC<sub>8</sub>E<sub>4</sub>could switch between wormlike micelles (<i>trans</i>native state) and fractal aggregates (under UV light), with changes in the self-assembled structure arising concurrently with changes in the absorption spectrum. Wormlike micelles could be recovered within 60 seconds of blue light illumination. To the best of our knowledge, this is the first time the degree of AzoPS photoisomerisation has been tracked <i>in</i><i>-situ</i>through combined UV-Vis absorption spectroscopy-SANS measurements. This technique could be widely used to gain mechanistic and kinetic insights into light-dependent processes that are reliant on self-assembly.

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