Gold Nanoparticles Allow Optoplasmonic Evaporation from Open Silica Cells with a Logarithmic Approach to Steady-State Thermal Profiles

Abstract

In this work, plasmonically heated solid-state gold nanoparticle (AuNP) arrays are investigated under novel conditions that include large (>35°C) steady-state (SS) temperature increases (∆T) dominated by conduction in open environments that allow vapor-liquid phase change. Evaporative cooling from the open system decreases SS ∆T of the system by as much as (11.6 ( 0.33)°C (45%), consistent with predictions from an energy balance model expanded in this work to account for evaporative cooling and associated decreasing thermal mass. Comparing dynamic and steady temperature profiles from water evaporating from a AuNPcoated Si cell at 50 mW laser irradiation with the model yielded an average accumulated residual sum of squares of 2.95°C 2 over 200 s. Temperature increases that distribute nonuniformly across sample cell surfaces due to high laser power (e150 mW) and conductive heat transfer are accurately and uniformly (<0.7% difference) represented by an infinite fin model at laser powers from 50 to 150 mW, resulting in R 2 values near unity. Overall heat transfer coefficients for air cells estimated from both dynamic and steady-state models agree within 2.05 to 11.45%. This model independence allows predicting temporal evolution or steady-state distribution of temperatures from just two measured values. The improved models and increased understanding of these systems will play an important role in implementing plasmonically heated structures in sustainable energy applications, biomedical applications and many others.

Initial dynamic thermal dissipation modes enhance heat dissipation in gold nanoparticle–polydimethylsiloxane thin films

“…Optimal thermal heating of AuNPs occurs at the LSPR wavelength with lower temperature changes observed further from the peak wavelength as a result of lower energy absorption away from the LSPR wavelength. The observed multimodal activity decayed as time progressed before reaching an expected linear relation with time as the system reached the steady-state thermal dynamic mode, similar to previously reported nanocomposite samples [29]. The multimodal activity also decreased as the temperature driving force was evaluated further away from the heat spot Figure 3a shows the multimodal activity of the temperature driving force where 0-3 s shown was the dynamic thermal mode, 15-40 s was the steady-state thermal mode, and 3-15 s was the transition period between the dynamic and steady-state thermal modes.…”

Thermoplasmonic dissipation in gold nanoparticle–polyvinylpyrrolidone thin films

“…7 Thermoplasmonic heating is an outcome of optical damping of resonant continuous-wave or pulsed irradiation of NP 8 that have negligible Rayleigh scattering cross sections which occurs by absorption. 9,10 Overall dissipation of absorbed energy via radiative, conductive and convective pathways has been characterized in colloidal suspensions, 11,12 on super-wavelength ceramic 13 and polymer 14 substrates, and in multi-phase 15 and open systems. 16 However, evaluation of correlated optical and thermal effects in NPcontaining lms of subwavelength thickness remains sparse.…”

“…17 Sufficient accrual of heat is reported to reshape NP 18 or melt (evaporate) surrounding solids (liquids). 15,16,19 In contrast, AuNP in water-soluble, subwavelength polyvinylpyrrolidone (PVP) lms at separations less than LSPR wavelength extinguished less power as AuNP content increased. 20 This work measured and evaluated the thermal signature of power absorbed by AuNP concentrated in subwavelength PVP lms and its dissipation as heat, which has not been reported to date.…”

“…29 A microscopic energy balance 12 links nano-optical extinction to thermal dissipation and dynamics of heating and cooling. 13,15,20,30 A compact one-dimensional (1D) form of this balance is extensible to quantify thermal dissipation in 3D multi-scale plasmonic systems using nite element analysis (FEA). 31,32 Comparing optically extinguished power determined by Mie theory and CDA with FEA estimates of power dissipation by NPs in subwavelength polymer lms could improve design and integration into opto-and bioelectronic devices.…”

Polyelectrolytes: Influence on Evaporative Self-Assembly of Particles and Assembly of Multilayers with Polymers, Nanoparticles and Carbon Nanotubes

“…Demonstration of remote release inside living cells [43] enabled tracing intracellular processes relevant to immunology [44]. Besides, aggregates of nanoparticles embedded within biocompatible films can be activated by a near-IR laser [21][22][23]; these effects are based on nanoplasmonic heating of nanoparticles [45][46][47][48][49][50][51][52][53][54][55][56][57]. Additionally, magnetic nanoparticles enable positioning of polyelectrolyte capsules [58], while on the other hand activation is also possible [59].…”