Loading...
Search for:
photothermally
0.003 seconds
Total 37 records
Cavity-mediated stationary atom-mirror entanglement in the presence of photothermal effects
, Article Physics Letters, Section A: General, Atomic and Solid State Physics ; Volume 376, Issue 45 , 2012 , Pages 2955-2961 ; 03759601 (ISSN) ; Bahrampour, A. R ; Sharif University of Technology
2012
Abstract
We study stationary entanglement properties of an optomechanical system containing an atomic ensemble. We focus onto the case of the movable mirror strongly coupled to the cavity field through both radiation pressure and photothermal force. Exploiting a quantum Langevin equation approach we investigate the bipartite entanglement properties of various bipartite subsystems as well as stationary tripartite entanglement of the system. We particularly study robustness of the atom-mirror entanglement against temperature. We show that, even though the photothermal force is a dissipative force, it can significantly improve the cavity mediated atom-mirror entanglement
Efficient wound healing by antibacterial property: Advances and trends of hydrogels, hydrogel-metal NP composites and photothermal therapy platforms
, Article Journal of Drug Delivery Science and Technology ; Volume 73 , 2022 ; 17732247 (ISSN) ; Gheybi, H ; Adeli, M ; Sharif University of Technology
Editions de Sante
2022
Abstract
Bacterial infection is one of the biggest challenges in wound healing and imposes enormous burden on patient and medical system. Moreover, multidrug resistant microorganisms (MDR) limit the usage of therapeutic agents including antibiotics for wound treatment. Hydrogels are three-dimensional networks that have emerged as efficient scaffolds for the treatment of infected wounds. In addition to their intrinsic antibacterial activities, hydrogels are able to load and release therapeutic agents to keep the efficient dose during wound healing process. At the same lines, incorporation of metal nanoparticles (NPs) into hydrogels boosts their antibacterial activity. Moreover, photothermal agents...
Cationic graphene oxide nanoplatform mediates miR-101 delivery to promote apoptosis by regulating autophagy and stress
, Article International journal of nanomedicine ; Volume 13 , 2018 , Pages 5865-5886 ; 11782013 (ISSN) ; Akhavan, O ; Mottaghitalab, F ; Adeli, M ; Dinarvand, R ; Razzazan, S ; Arefian, E ; Soleimani, M ; Atyabi, F ; Sharif University of Technology
NLM (Medline)
2018
Abstract
Introduction: MicroRNA-101 (miR-101) is an intense cancer suppressor with special algorithm to target a wide range of pathways and genes which indicates the ability to regulate apoptosis, cellular stress, metastasis, autophagy, and tumor growth. Silencing of some genes such as Stathmin1 with miR-101 can be interpreted as apoptotic accelerator and autophagy suppressor. It is hypothesized that hybrid microRNA (miRNA) delivery structures based on cationized graphene oxide (GO) could take superiority of targeting and photothermal therapy to suppress the cancer cells
Photothermal properties of two-dimensional molybdenum disulfide (MoS2) with nanoflower and nanosheet morphology
, Article Materials Research Bulletin ; Volume 152 , 2022 ; 00255408 (ISSN) ; Shokrgozar, M. A ; Hamid, D. H ; Vossoughi, M ; Sharif University of Technology
Elsevier Ltd
2022
Abstract
PEGylated MoS2 nanoflower (MoS2-NF) and nanosheet (MoS2-NS) are synthesized through a one-pot hydrothermal method as photo absorbing agent (PAA). It is found that employing different thiol precursors result in distinct morphologies. The products are structurally, chemically, and morphologically characterized. Electron microscopy demonstrates the formation of sheet and flower morphologies of MoS2. Fourier transform infrared (FTIR) and thermal gravimetric (TGA) analysis confirm the PEGylation of MoS2 nanostructures. Raman and X-ray photoelectron spectroscopy (XPS) confirm the formation of 1T/2H structure of both samples. MoS2-NS demonstrates higher NIR absorption than MoS2-NF with a mass...
Entanglement and Decoherence in Optomechanical Systems Coupled through Photothermal Effects
, Ph.D. Dissertation Sharif University of Technology ; Bahrampour, Alireza (Supervisor)
Abstract
Optomechanical systems have attracted considerable attention in the last decade. Such a raising prominence is mainly due to its capability in providing new insight into the quantum behavior of macroscopic objects and exploring the interface between quantum and classical mechanics. Alongside this fundamental quest, cavity optomechanics has many other benefits, ranging from very precise measurements on forces and positions to quantum information processing. In this thesis, we investigate quantum properties of such systems. Particularly, we study cooling of the mechanical resonator toward its ground state and the entanglement between this mechanical resonator and the cavity field. Cooling the...
Photothermally heated and mesh-gridded solar-driven direct contact membrane distillation for high saline water desalination
, Article International Journal of Heat and Mass Transfer ; Volume 199 , 2022 ; 00179310 (ISSN) ; Asadollahi, M ; Mousavi, S.A ; Rajabi ghahnavieh, A ; Behzadi Sarok, M ; Khayet, M ; Sharif University of Technology
Elsevier Ltd
2022
Abstract
Photothermally heated and mesh-gridded membrane distillation (PHMD) system is proposed for desalination of high saline aqueous solutions. A triple-layered membrane, composed of a photothermal top nanofibrous layer containing polyacrylonitrile and dispersed carbon black nanoparticles and a polyvinylidene fluoride porous membrane supported on a nonwoven polyester, was prepared. A polypropylene mesh was used to hold the membrane. A 3D numerical simulation of the PHMD system was carried out by COMSOL and the appropriate length of the membrane module was determined. The effects of various operating parameters including solar radiation intensity on the permeate flux and thermal efficiency were...
The use of a glucose-reduced graphene oxide suspension for photothermal cancer therapy
, Article Journal of Materials Chemistry ; Volume 22, Issue 27 , 2012 , Pages 13773-13781 ; 09599428 (ISSN) ; Ghaderi, E ; Aghayee, S ; Fereydooni, Y ; Talebi, A ; Sharif University of Technology
RSC
2012
Abstract
A single-step green method for effective reduction and functionalization of graphene oxide (GO) by glucose was developed. Then, efficacy of the glucose-reduced GO sheets in photothermal therapy of LNCaP prostate cancer cells was investigated in vitro. The GO suspension reduced and functionalized by glucose in the presence of Fe catalyst showed a biocompatible property with an excellent near-infrared (NIR) photothermal therapy efficiency better than hydrazine-reduced GO, single-wall and multi-wall carbon nanotube suspensions which even showed some levels of toxicities. For complete destruction of the cancer cells at some time intervals of NIR irradiation (e.g., 0.5 and 12 min with a power...
Thermally conductive and superhydrophobic polyurethane sponge for solar-assisted separation of high-viscosity crude oil from water
, Article ACS Applied Materials and Interfaces ; Volume 14, Issue 5 , 2022 , Pages 7329-7339 ; 19448244 (ISSN) ; Pourjavadi, A ; Sharif University of Technology
American Chemical Society
2022
Abstract
The rapid and effective separation of high-viscosity heavy crude oil from seawater is a worldwide challenge. Herein, an ultralow density, photothermal, superhydrophobic, and thermally conductive polyurethane/polyaniline/hexagonal boron nitride@Fe3O4/polyacrylic-oleic acid resin sponge (PU/PANI/h-BN@Fe3O4/AR) was fabricated with a water contact angle (WCA) of 158°, thermal conductivity of 0.76 W m-1 K-1, density of 0.038 g cm-3, limited oxygen index (LOI) of 28.82%, and porosity of 97.97% and used for solar-assisted separation of high-viscosity crude oil from water. Photothermal components were composed of PANI and Fe3O4, while h-BN particles were used as thermally conductive and flame...
Design, Simulation and Construction of a Rapid Gene Amplification Microfluidic Device Using Polymerase Chain Reaction (PCR) Method
, M.Sc. Thesis Sharif University of Technology ; Shamloo, Amir (Supervisor)
Abstract
Polymerase chain reaction method is a conventional method for obtaining multiple copies of a specified segment in the DNA molecule and to amplify the DNA molecule itself. Therefore, this method has been of paramount importance in different fields of research and has been applied for different applications. PCR requires thermal cycling, or repeated temperature changes between two or three discrete temperatures to amplify specific nucleic acid target sequences. To achieve such thermal cycling, conventional bench-top thermal cyclers generally use a metal heating block powered by Peltier elements or benefit from forced convection heat transfer. Although efforts have been made in order to reduce...
An Experimental Study of Cancer Treatment Using Combined Hyperthermia and Chemotherapy Methods
, Ph.D. Dissertation Sharif University of Technology ; Vosoghi, Manoucher (Supervisor) ; Hormozinezhad, Mohammad Reza (Supervisor) ; Dinarvand, Rasoul (Supervisor) ; Iraji Zad, Azam (Co-Advisor)
Abstract
Cancer treatment is one of the most challenging issues of recent years. Extensive researches have been conducted in various fields of medicine, pharmacy, and medical physics in this regard. Today, considering nanotechnology developments, researchers believe that full cancer treatment is possible through the use of nano-systems designed with scientific background to overcome the defects of previous methods. In this research, the main purpose is to design and synthesize multifunctional hybrid nanostructures with favorable optical and magnetic properties providing a way to combine chemotherapy and thermal treatment. Accordingly, two different structures were designed and experimentally...
Study, Optimization and Construction of a Microfluidic Gene Amplification Device by Using Thin Film Layer Method
, M.Sc. Thesis Sharif University of Technology ; Vosoughi, Manouchehr (Supervisor) ; Alemzadeh, Iran (Co-Supervisor) ; Shamloo, Amir (Co-Supervisor)
Abstract
Polymerase Chain Reaction (PCR) is a process in which a special piece of a gene is amplified millions of times over a short period. This method has been of paramount importance in different fields of research and has been applied for different applications. PCR requires thermal cycling, or repeated temperature changes between two or three discrete temperatures to amplify specific nucleic acid target sequences. To achieve such thermal cycling, conventional bench-top thermal cyclers generally use a metal heating block powered by Peltier elements or benefit from forced convection heat transfer. Due to the fact that these methods are time consuming, it seems that design and fabrication of a fast...
Zinc ferrite spinel-graphene in magneto-photothermal therapy of cancer
, Article Journal of Materials Chemistry B ; Vol. 2, Issue. 21 , 2014 , p. 3306-3314 ; Meidanchi, A ; Ghaderi, E ; Khoei, S ; Sharif University of Technology
Abstract
A magneto-photothermal therapy for cancer (in vitro photothermal therapy of prostate cancer cells and in vivo photothermal therapy of human glioblastoma tumors in the presence of an external magnetic field) was developed using superparamagnetic zinc ferrite spinel (ZnFe2O4)-reduced graphene oxide (rGO) nanostructures (with various graphene contents). In vitro application of a low concentration (10 μg mL-1) of the ZnFe 2O4-rGO (20 wt%) nanostructures under a short time period (∼1 min) of near-infrared (NIR) irradiation (with a laser power of 7.5 W cm-2) resulted in an excellent destruction of the prostate cancer cells, in the presence of a magnetic field (∼1 Tesla) used for localizing the...
Hyperthermia-induced protein corona improves the therapeutic effects of zinc ferrite spinel-graphene sheets against cancer
, Article RSC Advances ; Vol. 4, issue. 107 , 2014 , p. 62557-62565 ; Akhavan, O ; Meidanchi, A ; Laurent, S ; Mahmoudi, M ; Sharif University of Technology
Abstract
Superparamagnetic zinc ferrite spinel-graphene nanostructures were synthesized as potential therapeutic agents in the magnetic targeted photothermal therapy of cancer and/or drug delivery. The global temperature of the solution and the local temperature at the nanoparticle (NP) surface determine the protein corona composition/content, which in turn affects the biological effects of NPs and the corresponding physiological responses. Therefore, it is rational to hypothesize that spinel-graphene nanostructures may have distinct protein corona compositions and contents, and therapeutic and toxic effects under laser irradiation. To assess this hypothesis, the effects of laser irradiation on the...
Improving the optomechanical entanglement and cooling by photothermal force
, Article Physical Review A - Atomic, Molecular, and Optical Physics ; Volume 85, Issue 6 , 2012 ; 10502947 (ISSN) ; Bahrampour, A. R ; Sharif University of Technology
2012
Abstract
Cooling and entanglement in optomechanical systems coupled through radiation pressure and photothermal force are studied. To develop the photothermal model, we derive an expression for deformation constant of the force. By exploiting linearized quantum Langevin equations, we investigate the dynamics of such systems. According to our analysis, in addition to separate action of radiation pressure and photothermal force, their cross-correlation effect plays an important role in the dynamics of the system. We also achieve an exact relation for the phonon number of the mechanical resonator in such systems, and then we derive an analytical expression for it at the weak-coupling limit. At the...
Wrapping bacteria by graphene nanosheets for isolation from environment, reactivation by sonication, and inactivation by near-infrared irradiation
, Article Journal of Physical Chemistry B ; Volume 115, Issue 19 , 2011 , Pages 6279-6288 ; 15206106 (ISSN) ; Ghaderi, E ; Esfandiar, A ; Sharif University of Technology
American Chemical Society
2011
Abstract
Bioactivity of Escherichia coli bacteria (as a simple model for microorganisms) and interaction of them with the environment were controlled by their capturing within aggregated graphene nanosheets. The oxygen-containing functional groups of chemically exfoliated single-layer graphene oxide nanosheets were reduced by melatonin as a biocompatible antioxidant. While each one of the graphene (oxide) suspension and melatonin solution did not separately show any considerable inactivation effects on the bacteria, aggregation of the sheets in the melatonin-bacterial suspension resulted in trapping the bacteria within the aggregated sheets, i.e., a kind of inactivation. The bacteria trapped within...
Photothermal heating using a near-field plasmonic probe, application in NFO-CVD
, Article 5th International Conference on Millimeter-Wave and Terahertz Technologies, MMWaTT 2018, 18 December 2018 through 20 December 2018 ; Volume 2018-December , 2019 , Pages 94-96 ; 21570965 (ISSN); 9781538677179 (ISBN) ; Heydarian, H ; Rashidian, B ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2019
Abstract
We present near-field photothermal heating capability of an aperture SNOM probe by exploiting a bowtie nanostructure on top of the probe aperture, which operates as a nanosource of heat to activate underlying nanoparticle. Heat generation density calculated for the bowtie nanostructure at its absorption resonance wavelength of 694 nm verifies efficient concentration of heating power at the bowtie tips, due to optical near-field effects. Total absorbed power for the nanodisk beneath the probe has the same resonance wavelength at 694 nm, which confirms that the temperature increase produced at the underneath nanoparticle is due to utilizing the bowtie nanostructure on top of the SNOM probe as...
An optimal architecture of magneto-plasmonic core-shell nanoparticles for potential photothermal applications
, Article Physical Chemistry Chemical Physics ; Volume 22, Issue 25 , 2020 , Pages 14318-14328 ; Souri, S ; Navid, H. A ; Sadighi Bonabi, R ; Anvari, A ; Palpant, B ; Sharif University of Technology
Royal Society of Chemistry
2020
Abstract
In this work, the optical responses of Fe3O4@Au and Fe3O4@Ag are comprehensively investigated using the discrete dipole approximation. It is found that the resonance wavelength and absorption efficiency strongly depend on the composition of the core and shell, geometry of the nanoparticles, core to particle volume ratio, core radius and shell thickness. The strongest impact is due to the shell material, the shape of the nanoparticles and their combination. When the composition of the shell is changed from gold to silver, instead of one fundamental resonance peak the absorption spectrum shows two, corresponding to the bonding plasmon mode at the nanoparticle-environment interface and...
Nanomaterials for photothermal and photodynamic cancer therapy
, Article Applied Physics Reviews ; Volume 9, Issue 1 , 2022 ; 19319401 (ISSN) ; Alizadeh, E ; Bani, F ; Davaran, S ; Akbarzadeh, A ; Rabiee, N ; Bahadori, A ; Ziaei, M ; Bagherzadeh, M ; Saeb, M. R ; Mozafari, M ; Hamblin, M. R ; Sharif University of Technology
American Institute of Physics Inc
2022
Abstract
In recent years, the role of optically sensitive nanomaterials has become powerful moieties in therapeutic techniques and has become particularly emphasized. Currently, by the extraordinary development of nanomaterials in different fields of medicine, they have found new applications. Phototherapy modalities, such as photothermal therapy (PTT) by toxic heat generation and photodynamic therapy (PDT) by reactive oxygen species, are known as promising phototherapeutic techniques, which can overcome the limitations of conventional protocols. Moreover, nanomaterial-based PDT and PTT match the simultaneous immune therapy and increase the immune system stimulation resulting from the denaturation of...
Gold-based hybrid nanostructures: more than just a pretty face for combinational cancer therapy
, Article Biophysical Reviews ; Volume 14, Issue 1 , 2022 , Pages 317-326 ; 18672450 (ISSN) ; Bavi, O ; Zamani, M ; Sharif University of Technology
Springer Science and Business Media Deutschland GmbH
2022
Abstract
The early diagnosis together with an efficient therapy of cancer is essential to treat cancer patients and to enhance their quality of life. The use of nanostructures, as a newer technology, has demonstrated proven benefits as efficient cancer theranostic agents in numerous recent studies. Having a tunable surface plasmon resonance, gold nanostructures have been the subject of many recent studies as excellent imaging and photothermal therapy agents. However, the potential cytotoxicity and weak stability of gold nanostructures necessitate further modifications using biocompatible materials for biological applications. Based on the composition of the final structure, these gold-based hybrid...
Tunable surface plasmon resonance–based remote actuation of bimetallic core-shell nanoparticle-coated Stimuli responsive polymer for switchable chemo-photothermal synergistic cancer therapy
, Article Journal of Pharmaceutical Sciences ; Volume 107, Issue 10 , 2018 , Pages 2618-2627 ; 00223549 (ISSN) ; Sadighi Bonabi, R ; Pourghazi, K ; Hadilou, N ; Sharif University of Technology
Abstract
New dual light/temperature-responsive nanocarriers were synthesized using bimetallic plasmonic Au-Ag and Ag-Au nanoparticles (NPs) as cores of vehicles which subsequently functionalized with an upper critical solubility temperature–based poly acrylamide-co-acrylonitrile using reversible addition-fragmentation chain transfer for spatiotemporally controlled chemo-photothermal synergistic cancer therapy. The bimetallic cores were assigned to sense wavelengths close to the localized surface plasmon resonance of monometallic NP shell to produce heat which not only can increase the surrounding temperature over the upper critical solubility temperature of polymer to open its valves and promote drug...