fahimeh noori

Surface plasmons have been used recently to generate heat nanosources, the intensity of which can be tuned, for example, with the wavelength of the excitation radiation and polarization. We present versatile analytical investigations for the three–dimensional computation of the temperature rise in complex planar arrays of metallic nanoparticles. In the case of elongated particles sustaining transverse and longitudinal plasmon modes, we show a simple temperature rise control of the surrounding medium when turning the incident polarization. In this article, the results of analytical simulation for the temperature distribution are presented in a planer array of gold hexagonal dimer nanoparticles and it is investigated how the temperature distribution of the array will change by changing the polarization angle of the incident light and wavelength. The polarization angle of the incident light is considered in 0 degrees (parallel to the dimer axis) and 45 degrees, and 90 degrees (perpendicular to the dimer axis) and,  according to the resonance wavelengths in each polarization, the temperature distribution and value have been simulated. In 90-degree polarization, light absorption is the most, and the highest wavelength of it occurred at 1334 nm, and this wavelength causes high-temperature changes in the array.

In recent years, there has been an increasing interest in using plasmonic nanoparticles as thermal nano sources with the ability to be controlled remotely by light, which has led to the emergence of thermoplasmonics science. In this regard, nanoparticles with different shapes, compositions, and materials can create limited heat generation at the nanoscale. Therefore, in this article, the plasmonic and thermoplasmonic properties of asymmetric hexagonal heterodimer nanoparticles of Ag-Au, Cu-Ag, and Cu-Au compositions have been investigated. The isosbestic points and the coupling energy due to the gap created in the plasmonic modes of the absorption spectrum due to the change in the polarization of the light have been investigated and calculated. The obtained results show that with the combination of heterogeneous binary nanoparticles of silver and copper in light polarization parallel to the dimer axis, the electric field can be strengthened up to 293 times, and the highest temperature change in Ag-Au heterogeneous binary nanoparticles with a value of ∆Tmax=417℃  in L polarization is related.

In recent years, there has been a growing interest in the use of plasmonic nanoparticles as sources of heat remotely controlled by light, giving rise to the field of thermoplasmonics. To this end, gold nanoframes are unique nanomaterials with the intrinsic capability to generate a nanoscale confined light-triggered thermal effect. Therefore, the plasmonic and thermoplasmonic properties of the gold hexagonal nanoframes have been investigated in this paper. Moreover, the effect of some influential parameters such as gap distance between the two nanoparticles and the distance between the center of the cavities and the center of the nanoframes on the local electric field and the surface temperature of the nanoframes have been reported

When metal nanoparticles are exposed to electromagnetic waves, they generate heat due to the interaction of surface conduction electrons of nanoparticles and their fluctuations, as well as the Joule heating effect. The emerging science of investigating heat produced by nanoparticles is called thermoplasmonics. The heat generated is remotely controlled by light. This generated heat increases the temperature in nanoparticles and the environment. Thermoplasmonics has many applications in various fields such as physics, chemistry, and medicine, and measuring the produced heat is complicated. This article studies the practical method of increasing the local electric field and producing heat by nanoparticles. Placing asymmetric hexagonal nanoparticles as an antenna or amplifier around a rectangular nanoparticle increases the light interaction with the middle nanoparticle. It causes an increase in the local electric field and generated heat by the middle nanoparticle.

Obesity increases inflammatory indices and creates insulin resistance, and proper diet along with regular physical exercises are effective in improving these indices. Therefore, the aim of this study was to investigate 10 weeks of calorie restriction along with alkaline, acidic diet and functional exercises on lipid profile, body composition and C-reactive protein levels in obese and overweight adults. In this semi-experimental research, 53 obese and overweight adults (18 men, 35 women) with an average age of 35.4±8.3 years voluntarily participated. Calorie restriction along with alkaline and acidic diet and functional exercises were applied in three experimental groups and one control group for 10 weeks. Body composition (weight, waist-hip ratio, body mass index, muscle and fat mass, visceral fat), lipid indices (fasting cholesterol, high-density lipoprotein, low-density lipoprotein, triglyceride) and C-reactive protein levels were measured. Anukova and Bonferroni tests were used to compare groups in the post-test and the significance level was 0.05. body composition (weight, body mass index, waist-to-hip ratio, fat mass and visceral fat) and cholesterol decreased in the alkaline diet group along with calorie restriction and functional exercises in overweight and obese people (P≥0.05). Calorie restriction and alkaline diet by reducing acid load along with 10 weeks of functional training lead to improvement of body composition and cholesterol in overweight and obese adults.