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Daryoosh Vashaee

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https://www.readbyqxmd.com/read/27793788/from-solvent-free-microspheres-to-bioactive-gradient-scaffolds
#1
Morteza Rasoulianboroujeni, Mostafa Yazdimamaghani, Payam Khoshkenar, Venkata Raveendra Pothineni, Kwang Min Kim, Teresa A Murray, Jayakumar Rajadas, David K Mills, Daryoosh Vashaee, Keyvan Moharamzadeh, Lobat Tayebi
A solvent-free microsphere sintering technique was developed to fabricate scaffolds with pore size gradient for tissue engineering applications. Poly(D,L-Lactide) microspheres were fabricated through an emulsification method where TiO2 nanoparticles were employed both as particulate emulsifier in the preparation procedure and as surface modification agent to improve bioactivity of the scaffolds. A fine-tunable pore size gradient was achieved with a pore volume of 30±2.6%. SEM, EDX, XRD and FTIR analyses all confirmed the formation of bone-like apatite at the 14th day of immersion in Simulated Body Fluid (SBF) implying the ability of our scaffolds to bond to living bone tissue...
October 25, 2016: Nanomedicine: Nanotechnology, Biology, and Medicine
https://www.readbyqxmd.com/read/27519021/nanoscale-solid-state-cooling-a-review
#2
Amirkoushyar Ziabari, Mona Zebarjadi, Daryoosh Vashaee, Ali Shakouri
The recent developments in nanoscale solid-state cooling are reviewed. This includes both theoretical and experimental studies of different physical concepts, as well as nanostructured material design and device configurations. We primarily focus on thermoelectric, thermionic and thermo-magnetic coolers. Particular emphasis is given to the concepts based on metal-semiconductor superlattices, graded materials, non-equilibrium thermoelectric devices, Thomson coolers, and photon assisted Peltier coolers as promising methods for efficient solid-state cooling...
September 2016: Reports on Progress in Physics
https://www.readbyqxmd.com/read/27392974/thioglycolic-acid-capped-cds-quantum-dots-conjugated-to-%C3%AE-amylase-as-a-fluorescence-probe-for-determination-of-starch-at-low-concentration
#3
Mahnoush Tayebi, Mohammad Tavakkoli Yaraki, Azadeh Mogharei, Mahnaz Ahmadieh, Mohammadreza Tahriri, Daryoosh Vashaee, Lobat Tayebi
In the present research, water soluble thioglycolic acid-capped CdS quantum dots (QDs) were synthesized by chemical precipitation method. The characteristics of prepared quantum dots were determined using X-Ray Diffraction (XRD) and Transmission Electron Microscopy (TEM). The obtained results revealed that CdS QDs have 5.60 nm crystallite size, hexagonal wurtzite structure and spherical morphology with less than 10 nm diameter. The photoluminescence (PL) spectroscopy was performed in order to study the effect of the presence of starch solutions...
September 2016: Journal of Fluorescence
https://www.readbyqxmd.com/read/27157760/mechanical-properties-of-natural-chitosan-hydroxyapatite-magnetite-nanocomposites-for-tissue-engineering-applications
#4
Fatemeh Heidari, Mehdi Razavi, Mohammad E Bahrololoom, Reza Bazargan-Lari, Daryoosh Vashaee, Hari Kotturi, Lobat Tayebi
Chitosan (CS), hydroxyapatite (HA), and magnetite (Fe3O4) have been broadly employed for bone treatment applications. Having a hybrid biomaterial composed of the aforementioned constituents not only accumulates the useful characteristics of each component, but also provides outstanding composite properties. In the present research, mechanical properties of pure CS, CS/HA, CS/HA/magnetite, and CS/magnetite were evaluated by the measurements of bending strength, elastic modulus, compressive strength and hardness values...
August 1, 2016: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/26972331/classification-of-valleytronics-in-thermoelectricity
#5
Payam Norouzzadeh, Daryoosh Vashaee
The theory of valleytronics as a material design tool for engineering both thermal and electrical transport properties is presented. It is shown that the interplay among the valleytronics parameters such as the degeneracy of the band, intervalley transitions, effective mass, scattering exponent, and the Fermi energy may deteriorate or ameliorate any or all of the main thermoelectric properties. A flowchart classifying the different paths through which the valleytronics can influence the thermoelectric figure-of-merit ZT is derived and discussed in detail...
2016: Scientific Reports
https://www.readbyqxmd.com/read/26543020/biomineralization-and-biocompatibility-studies-of-bone-conductive-scaffolds-containing-poly-3-4-ethylenedioxythiophene-poly-4-styrene-sulfonate-pedot-pss
#6
Mostafa Yazdimamaghani, Mehdi Razavi, Masoud Mozafari, Daryoosh Vashaee, Hari Kotturi, Lobat Tayebi
UNLABELLED: Considering the well-known phenomenon of enhancing bone healing by applying electromagnetic stimulation, manufacturing conductive bone scaffolds is on demand to facilitate the delivery of electromagnetic stimulation to the injured region, which in turn significantly expedites the healing procedure in tissue engineering methods. For this purpose, hybrid conductive scaffolds composed of poly(3,4-ethylenedioxythiophene), poly(4-styrene sulfonate) ( PEDOT: PSS), gelatin (Gel), and bioactive glass (BaG) were produced employing freeze drying technique...
December 2015: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/25893390/in-vivo-biocompatibility-of-mg-implants-surface-modified-by-nanostructured-merwinite-peo
#7
Mehdi Razavi, Mohammadhossein Fathi, Omid Savabi, Daryoosh Vashaee, Lobat Tayebi
Magnesium (Mg) alloys have been suggested as biodegradable bone implant materials due to their good intrinsic biocompatibility and great mechanical properties. Although magnesium has attractive properties as an orthopedic implant material, its quick degradation and low bioactivity may lead to the loss of mechanical integrity of the implant during the bone healing process. In this paper, we endeavor to surmount the abovementioned defects using the surface coating technique. We have recently coated AZ91 magnesium implants with merwinite (Ca3MgSi2O8) through the coupling of plasma electrolytic oxidation (PEO) and electrophoretic deposition method...
May 2015: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/25744661/type-viii-si-based-clathrates-prospects-for-a-giant-thermoelectric-power-factor
#8
Payam Norouzzadeh, Jerzy S Krasinski, Charles W Myles, Daryoosh Vashaee
Although clathrate materials are known for their small thermal conductivity, they have not shown a large thermoelectric power factor so far. We present the band structures of type VIII Si, Ge, and Sn clathrates as well as the alkali and alkaline-earth intercalated type VIII Si clathrates. Our calculations revealed that this group of materials has potentially large power factors due to the existence of a large number of carrier pockets near their band edges. In particular, we calculated the charge carrier transport properties of Si46-VIII both for n-type and p-type materials...
April 14, 2015: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/25686970/surface-modification-of-biodegradable-porous-mg-bone-scaffold-using-polycaprolactone-bioactive-glass-composite
#9
Mostafa Yazdimamaghani, Mehdi Razavi, Daryoosh Vashaee, Lobat Tayebi
A reduction in the degradation rate of magnesium (Mg) and its alloys is in high demand to enable these materials to be used in orthopedic applications. For this purpose, in this paper, a biocompatible polymeric layer reinforced with a bioactive ceramic made of polycaprolactone (PCL) and bioactive glass (BG) was applied on the surface of Mg scaffolds using dip-coating technique under low vacuum. The results indicated that the PCL-BG coated Mg scaffolds exhibited noticeably enhanced bioactivity compared to the uncoated scaffold...
April 2015: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/25579892/in-vivo-assessments-of-bioabsorbable-az91-magnesium-implants-coated-with-nanostructured-fluoridated-hydroxyapatite-by-mao-epd-technique-for-biomedical-applications
#10
Mehdi Razavi, Mohammadhossein Fathi, Omid Savabi, Daryoosh Vashaee, Lobat Tayebi
Although magnesium (Mg) is a unique biodegradable metal which possesses mechanical property similar to that of the natural bone and can be an attractive material to be used as orthopedic implants, its quick corrosion rate restricts its actual clinical applications. To control its rapid degradation, we have modified the surface of magnesium implant using fluoridated hydroxyapatite (FHA: Ca10(PO4)6OH2-xFx) through the combined micro-arc oxidation (MAO) and electrophoretic deposition (EPD) techniques, which was presented in our previous paper...
March 2015: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/25391971/prediction-of-giant-thermoelectric-power-factor-in-type-viii-clathrate-si46
#11
Payam Norouzzadeh, Charles W Myles, Daryoosh Vashaee
Clathrate materials have been the subject of intense interest and research for thermoelectric application. Nevertheless, from the very large number of conceivable clathrate structures, only a small fraction of them have been examined. Since the thermal conductivity of clathrates is inherently small due to their large unit cell size and open-framework structure, the current research on clathrates is focused on finding the ones with large thermoelectric power factor. Here we predict an extraordinarily large power factor for type-VIII clathrate Si(46)...
2014: Scientific Reports
https://www.readbyqxmd.com/read/25203515/in-vivo-study-of-nanostructured-akermanite-peo-coating-on-biodegradable-magnesium-alloy-for-biomedical-applications
#12
Mehdi Razavi, Mohammadhossein Fathi, Omid Savabi, Daryoosh Vashaee, Lobat Tayebi
The major issue for biodegradable magnesium alloys is the fast degradation and release of hydrogen gas. In this article, we aim to overcome these disadvantages by using a surface modified magnesium implant. We have recently coated AZ91 magnesium implants by akermanite (Ca2 MgSi2 O7 ) through the combined electrophoretic deposition (EPD) and plasma electrolytic oxidation (PEO) methods. In this work, we performed the in vitro and in vivo examinations of these coated implants using L-929 cell line and rabbit animal model...
May 2015: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/25118669/improvement-of-biodegradability-bioactivity-mechanical-integrity-and-cytocompatibility-behavior-of-biodegradable-mg-based-orthopedic-implants-using-nanostructured-bredigite-ca7mgsi-4o-16-bioceramic-coated-via-asd-epd-technique
#13
Mehdi Razavi, Mohammadhossein Fathi, Omid Savabi, Daryoosh Vashaee, Lobat Tayebi
This research explored the influence of surface modification of AZ91 Mg alloy on the biodegradation, bioactivity, mechanical integrity and cytocompatibility of the alloy. For this purpose, a nanostructured bredigite (Ca7MgSi4O16) ceramic coating was prepared on biodegradable AZ91 Mg alloy through anodic spark deposition and electrophoretic deposition method. The phase composition and surface morphology of the coated alloy were characterized by X-ray diffraction, scanning electron microscope and transmission electron microscope...
December 2014: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/24907750/in-vitro-study-of-nanostructured-diopside-coating-on-mg-alloy-orthopedic-implants
#14
Mehdi Razavi, Mohammadhossein Fathi, Omid Savabi, Daryoosh Vashaee, Lobat Tayebi
The high corrosion rate of Mg alloys has hindered their application in various areas, particularly for orthopedic applications. In order to decrease the corrosion rate and to improve the bioactivity, mechanical stability and cytocompatibility of the Mg alloy, nanostructured diopside (CaMgSi2O6) has been coated on AZ91 Mg alloy using a combined micro arc oxidation (MAO) and electrophoretic deposition (EPD) method. The crystalline structure, the morphology and the composition of the samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR)...
August 1, 2014: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/24863221/green-synthesis-of-a-new-gelatin-based-antimicrobial-scaffold-for-tissue-engineering
#15
Mostafa Yazdimamaghani, Daryoosh Vashaee, Senait Assefa, Mitra Shabrangharehdasht, Armin Tahmasbi Rad, Margaret A Eastman, Kenneth J Walker, Sundar V Madihally, Gerwald A Köhler, Lobat Tayebi
With the aim of developing appropriate scaffolds for tissue engineering to suppress the formation of biofilms, an effective one-pot process was applied in this study to produce scaffolds with inherent antibacterial activity. A new method to synthesize genipin-crosslinked gelatin/nanosilver scaffolds with "green" in situ formation of silver nanoparticles by heat treatment is presented in this paper. In this procedure, toxic solvents, reducing agents, and stabilizing agents are avoided. UV-visible absorption spectra of the synthesized gelatin/nanosilver solutions were obtained immediately and three months after the synthesis revealing the presence and high stability of the silver nanoparticles...
June 1, 2014: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/24730280/electrospun-nanofibers-from-filtration-membranes-to-highly-specialized-tissue-engineering-scaffolds
#16
Vahid Shabafrooz, Masoud Mozafari, Daryoosh Vashaee, Lobat Tayebi
Electrospinning is a widely used technique to produce continuous polymeric fibers ranging from 2 nm to several micrometers. This technique is not only employed in research laboratories, but it is also increasingly being applied in different industrial fields in the last few decades as a highly versatile and cost-effective technology. Compared to conventional techniques for fiber fabrication, electrospinning can fabricate fibers in a more desirable size (e.g., nanoscale). Nanofibers are generated by the application of a strong electric field on polymer solution...
January 2014: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/24721316/surface-microstructure-and-in-vitro-analysis-of-nanostructured-akermanite-ca2mgsi2o7-coating-on-biodegradable-magnesium-alloy-for-biomedical-applications
#17
Mehdi Razavi, Mohammadhossein Fathi, Omid Savabi, Batoul Hashemi Beni, Daryoosh Vashaee, Lobat Tayebi
Magnesium (Mg) alloys, owing to their biodegradability and good mechanical properties, have potential applications as biodegradable orthopedic implants. However, several poor properties including low corrosion resistance, mechanical stability and cytocompatibility have prevented their clinical application, as these properties may result in the sudden failure of the implants during the bone healing. In this research, nanostructured akermanite (Ca2MgSi2O7) powder was coated on the AZ91 Mg alloy through electrophoretic deposition (EPD) assisted micro arc oxidation (MAO) method to modify the properties of the alloy...
May 1, 2014: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/24443356/conducting-scaffolds-for-liver-tissue-engineering
#18
Armin Tahmasbi Rad, Naushad Ali, Hari Shankar R Kotturi, Mostafa Yazdimamaghani, Jim Smay, Daryoosh Vashaee, Lobat Tayebi
It is known that there is a correlation between a cell membrane potential and the proliferation of the cell. The high proliferation capacity of liver cells can also be attributed to its specific cell membrane potential as liver cell is recognized as one of the most depolarized of all differentiated cells. We hypothesized that this phenomenon can be emphasized by growing liver cells in conducting scaffolds that can increase the electrical communication among the cells. In this article, using tissue engineering techniques, we grew hepatocyte cells in scaffolds with various compositions...
November 2014: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/24399874/3d-conductive-nanocomposite-scaffold-for-bone-tissue-engineering
#19
Aref Shahini, Mostafa Yazdimamaghani, Kenneth J Walker, Margaret A Eastman, Hamed Hatami-Marbini, Brenda J Smith, John L Ricci, Sundar V Madihally, Daryoosh Vashaee, Lobat Tayebi
Bone healing can be significantly expedited by applying electrical stimuli in the injured region. Therefore, a three-dimensional (3D) ceramic conductive tissue engineering scaffold for large bone defects that can locally deliver the electrical stimuli is highly desired. In the present study, 3D conductive scaffolds were prepared by employing a biocompatible conductive polymer, ie, poly(3,4-ethylenedioxythiophene) poly(4-styrene sulfonate) (PEDOT:PSS), in the optimized nanocomposite of gelatin and bioactive glass...
2014: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/24172765/prediction-of-a-large-number-of-electron-pockets-near-the-band-edges-in-type-viii-clathrate-si46-and-its-physical-properties-from-first-principles
#20
Payam Norouzzadeh, Charles W Myles, Daryoosh Vashaee
The material design of type-VIII clathrate Si46 is presented based on first principles. The structural, electronic, elastic, vibrational, and thermodynamic properties of this hypothetical material are presented. Our results predict that type-VIII clathrate Si46 is an indirect semiconductor with a bandgap of 1.24 eV. The band structure revealed an interestingly large number of electron pockets near both conduction and valance band edges. Such a large density of states near the band edges, which is higher than that of the best thermoelectric materials discovered so far, can result in a large thermoelectric power factor (>0...
November 27, 2013: Journal of Physics. Condensed Matter: An Institute of Physics Journal
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