Long-ranged order in a thermally driven system with temperature dependent interactions

Soft Matter ◽  
2022 ◽  
Author(s):  
Rahul Karmakar ◽  
Jaydeb Chakrabarti
Keyword(s):  
Temperature Difference ◽  
Metallic Nanoparticles ◽  
Particle Interaction ◽  
Temperature Dependent ◽  
Driving Situation ◽  
Driven System ◽  
Thermally Driven

Aggregation of macro-molecules under external drive is far from understood. An important driving situation is achieved by temperature difference. The inter-particle interaction in metallic nanoparticles with ligand capping is reported...

scholarly journals Circular dispersive shock waves in colloidal media

2016 ◽  
Vol 25 (04) ◽  
pp. 1650044 ◽  
Author(s):  
A. Azmi ◽  
T. R. Marchant
Keyword(s):  
Solitary Waves ◽  
Numerical Solutions ◽  
Particle Density ◽  
Modulational Instability ◽  
Particle Interaction ◽  
Packing Fraction ◽  
Effect Of Temperature ◽  
Hard Sphere Model ◽  
Large Radius ◽  
Temperature Dependent

A dispersive shock wave (DSW), with a circular geometry, is studied in a colloidal medium. The colloidal particle interaction is based on the repulsive theoretical hard sphere model, where a series in the particle density, or packing fraction is used for the compressibility. Experimental results show that the particle interactions are temperature dependent and can be either repulsive or attractive, so the second term in the compressibility series is modified to allow for temperature dependent effects, using a power-law relationship. The governing equation is a focusing nonlinear Schrödinger-type equation with an implicit nonlinearity. The initial jump in electric field amplitude is resolved via a DSW, which forms before the onset of modulational instability. A semi-analytical solution for the amplitude of the solitary waves in a DSW of large radius, is derived based on a combination of conservation laws and geometrical considerations. The effect of temperature and background packing fraction on the evolution of the DSW and the amplitude of the solitary waves is discussed and the semi-analytical solutions are found to be very accurate, when compared with numerical solutions.

Thermally driven V2O5nanocrystal formation and the temperature-dependent electronic structure study

CrystEngComm ◽  
2012 ◽  
Vol 14 (2) ◽  
pp. 626-631 ◽  
Author(s):  
Chongwen Zou ◽  
Lele Fan ◽  
Ruiqun Chen ◽  
Xiaodong Yan ◽  
Wensheng Yan ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Structure Study ◽  
Temperature Dependent ◽  
Thermally Driven

scholarly journals A Simple Method Based on Routine Observations to Nowcast Down-Valley Flows in Shallow, Narrow Valleys

2016 ◽  
Vol 55 (7) ◽  
pp. 1497-1511 ◽  
Author(s):  
Gert-Jan Duine ◽  
Thierry Hedde ◽  
Pierre Roubin ◽  
Pierre Durand
Keyword(s):  
Temperature Difference ◽  
Potential Temperature ◽  
Threshold Value ◽  
Simple Relation ◽  
Forecast Verification ◽  
Valley Wind ◽  
Simple Method ◽  
Thermally Driven ◽  
Scale Down ◽  
Valley Flows

AbstractA simple relation to diagnose the existence of a thermally driven down-valley wind in a shallow (100 m deep) and narrow (1–2 km wide) valley based on routine weather measurements has been determined. The relation is based on a method that has been derived from a forecast verification principle. It consists of optimizing a threshold of permanently measured quantities to nowcast the thermally driven Cadarache (southeastern France) down-valley wind. Three parameters permanently observed at a 110-m-high tower have been examined: the potential temperature difference between the heights of 110 and 2 m, the wind speed at 110 m, and a bulk Richardson number. The thresholds are optimized using the wind observations obtained within the valley during the Katabatic Winds and Stability over Cadarache for the Dispersion of Effluents (KASCADE) field experiment, which was conducted in the winter of 2013. The highest predictability of the down-valley wind at the height of 10 m (correct nowcasting ratio of 0.90) was found for the potential temperature difference at a threshold value of 2.6 K. The applicability of the method to other heights of the down-valley wind (2 and 30 m) and to summer conditions is also demonstrated. This allowed a reconstruction of the climatology of the thermally driven down-valley wind that demonstrates that the wind exists throughout the year and is strongly linked to nighttime duration. This threshold technique will make it possible to forecast the subgrid-scale down-valley wind from operational numerical weather coarse-grid simulations by means of statistical downscaling.

On Studying Fluidic Motions in an Oscillating Heat Pipe

2013 ◽  
Vol 284-287 ◽  
pp. 513-517
Author(s):  
Han Ming Chen ◽  
Ching Ming Chiang ◽  
Kuo Hsiang Chien ◽  
Chi Chuan Wang
Keyword(s):  
Heat Pipe ◽  
Temperature Difference ◽  
Closed Loop ◽  
Operating Temperature ◽  
Lower Number ◽  
Liquid Ratio ◽  
Oscillating Heat Pipe ◽  
Thermally Driven ◽  
Higher Temperature ◽  
Channel Configuration

This study develops an analytical model applicable for predicting the fluidic motion of an oscillating heat pipe (OHP) with asymmetric arrayed channel configuration. The analytic model considers the temperature difference between the average evaporating region and the average condensing region as the thermally driven force for the fluidic motion. The calculated results show that the closed-loop OHP with asymmetric arrayed channel under lower number of turns, lower filled liquid ratio, higher operating temperature and higher temperature difference between the average evaporating region and the average condensing region for the frequency ratio of unity could attain a better performance of the fluidic motions.

scholarly journals Adsorption of dye molecules on metallic nanoparticles: Unraveling the origins of the modified spectral absorption

2021 ◽  
Author(s):  
◽  
Xiaohan Chen
Keyword(s):  
Metallic Nanoparticles ◽  
Particle Interaction ◽  
Metallic Nanoparticle ◽  
Surface Absorption ◽  
High Coverage ◽  
Silver Colloids ◽  
Chemical Effects ◽  
Surface Enhanced ◽  
Low Coverage ◽  
Insight Into

<p>The enhanced optical response of molecules in the vicinity of metallic nanoparticle is the basis for many surface enhanced spectroscopies and of interest to the field of plasmonics. However, the mechanisms behind the enhancement are still a matter of debate because of the interplay between electromagnetic and chemical effects, which complicates the interpretation of spectral changes. Our ability to measure the surface absorption of dyes from very low coverage to high coverage allows us to identify the con- tribution of each effect (dye-dye interaction and dye-particle interaction) to the spectral modifications. In the course of this investigation, we also measured the adsorption isotherms of dyes in the presence of halide ions, which provides a detailed insight into the adsorption process on silver colloids.</p>

Generalised dissipative particle dynamics with energy conservation: density- and temperature-dependent potentials

2019 ◽  
Vol 21 (45) ◽  
pp. 24891-24911 ◽  
Author(s):  
Josep Bonet Avalos ◽  
Martin Lísal ◽  
James P. Larentzos ◽  
Allan D. Mackie ◽  
John K. Brennan
Keyword(s):  
Energy Conservation ◽  
Force Fields ◽  
Dissipative Particle Dynamics ◽  
Particle Interaction ◽  
Interaction Force ◽  
Particle Dynamics ◽  
Temperature Dependent ◽  
Energy Conserving ◽  
Dynamics Method

Energy-conserving dissipative particle dynamics method appropriate for particle interaction force fields that are both density- and temperature-dependent.

Seebeck Scanning Microprobe for Thermoelectric FGM

2005 ◽  
Vol 492-493 ◽  
pp. 587-592 ◽  
Author(s):  
D. Platzek ◽  
G. Karpinski ◽  
Cestmir Drasar ◽  
Eckhard Müller
Keyword(s):  
Seebeck Coefficient ◽  
Conversion Efficiency ◽  
Temperature Difference ◽  
Current Flow ◽  
Electrical Potential ◽  
Large Temperature ◽  
Voltage Response ◽  
Temperature Dependent ◽  
Temperature Range ◽  
Additional Option

The FGM principle plays an important role in enhancing the efficiency of thermoelectric devices. While a thermoelectric generator (TEG) is typically operating in a large temperature difference, attractive conversion efficiency of a particular semiconductor is restricted to a small temperature range. Hence, when employing a semiconductor with its highest possible efficiency at the respective temperature in the internal temperature field along a stacked TEG, the overall conversion efficiency of the device may be considerably enhanced. Similarly, the FGM principle can be employed for linearization of thermal sensors. The output voltage (response) of the sensor is proportional to the Seebeck coefficient of the material the sensor is made of. Since the Seebeck coefficient is strongly temperature-dependent, the sensor response is not linear with temperature. However, combining in a stack two or more semiconductors which temperature dependence of the Seebeck coefficient are complementary to each other, results in a sensor with linear response (i.e. its output is proportional to the temperature difference, or heat flux, respectively.) Stacking of several materials to each other or grading a semiconducting sample requires a technique which can scan the Seebeck coefficient profiles S(x) along the stack. Accordingly a Seebeck micro-probe technique has been developed for scanning the surface of a sample monitoring S with a resolution of down to 10 µm within the temperature range from -15°C to 60°C. An additional option of such a device is the scanning of the electrical potential along the stack under current flow [1]. Thus, related experimental data on the local profiles of the electrical conductivity and Seebeck coefficient along the stack (or continuously graded FGM) will be available. The apparatus has been automated so that extended areas may be scanned providing two-dimensional images. Additionally, several samples can be scanned in one automatic run.

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