Publications/Patents

2014
Liu L, Layani M, Yellinek S, Kamyshny A, Ling H, Lee PS, Magdassi S, Mandler D. "Nano to nano" electrodeposition of WO3 crystalline nanoparticles for electrochromic coatings†. Journal of Materials Chemistry A [Internet]. 2014;2 (38) :16224. Publisher's VersionAbstract
A "nano to nano" electrodeposition approach for preparing nano-structured thin films from the dispersion of nano-objects is reported. A typical WO3 system is demonstrated, where nanocrystalline films are electrodeposited onto transparent conductive electrodes such as ITO and Ag grid printed PET (Ag grid/PET) from the water dispersion of WO3 nanoparticles without applying high potential, adding surfactants or polymers. The process is based on the reduction of WO3, which eliminates the electrostatic repulsion between the nanoparticles causing film deposition on the cathode. The reduced WO3 (HWO3) is conductive, thus it allows further film growth towards higher thickness and coverage. The electrodeposited films consist of stacked crystalline nanoparticles, which provide a highly active surface area, facilitate the penetration of electrolyte and the intercalation/deintercalation of Li+ in the nanocrystals and therefore result in outstanding electrochromic performance and stability (92% contrast, 9 s coloring and 15 s bleaching, retaining 76% contrast after 1000 coloring-bleaching cycles). The thickness, electrochromic performance and surface coverage of the films are well tuned by potential and time. This novel "nano to nano" electrodeposition approach based on the electrochemical redox of nano-objects can be extended to various transition metal oxide nano-objects with different sizes and shapes. [ABSTRACT FROM AUTHOR]Copyright of Journal of Materials Chemistry A is the property of Royal Society of Chemistry and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Tulchinsky D, Uvarov V, Popov I, Mandler D, Magdassi S. A novel non-selective coating material for solar thermal potential application formed by reaction between sol–gel titania and copper manganese spinel. Solar Energy Materials and Solar Cells [Internet]. 2014;120 (Part A) :23 - 29. Publisher's VersionAbstract
A method for preparing a novel bixbyite non-selective coating for solar thermal conversion is described. The coating is formed by a thermal reaction between a titania sol–gel precursor with a copper manganese spinel to form a new material, Cu0.44Ti0.44Mn0.84Fe0.28O3, with a bixbyite structure. The effect of temperature and ratio between the two components on the formation of the bixbyite layer (deposited on Inconel by spray-coating) was studied. The absorptance of the films (AM 1.5; 335–2500nm) with a thickness of 10±2µm after annealing at 2h at 650°C and 750°C was 97.4% and 94.7%, respectively. This synthesis represents a novel approach in which the final solar thermal coating is formed as a continuous and uniform layer which combines both the absorber and the ceramic binder. The developed material shows promising results for future applications as absorber in solar thermal energy conversion.•A new material combining the absorber and a ceramic matrix was formed.•This material was used for solar thermal application with high absorptivity.•The formation of the material occurred by thermal treatment of a sprayed thin film.
Wünscher S, Rasp T, Grouchko M, Kamyshny A, Paulus RM, Perelaer J, Kraft T, Magdassi S, Schubert US. Simulation and prediction of the thermal sintering behavior for a silver nanoparticle ink based on experimental input. Journal of Materials Chemistry C [Internet]. 2014;2 (31) :6342. Publisher's VersionAbstract
In order to develop a prediction model for resistivity evolution during isothermal sintering, a commercial silver nanoparticle ink was characterized for its metal content, particle size and behavior upon heating. Electrical properties, mass loss behavior, grain size development and material densification were studied for thermal sintering at 175 °C. The correlation between mass loss, height loss of the resulting sintered structures, grain size and electrical resistivity was investigated to gain further understanding of the silver nanoparticle sintering process. The results of thermal sintering were used to calibrate a discrete element sintering model that provides microstructural properties with which the resistivity development at 150 and 200 °C was successfully predicted. The model was validated by experimental data obtained at these temperatures. A variation of particle size and particle size distribution in the simulations furthermore illustrate their influence on final resistivity showing that using small particles with a broad distribution are preferable for reducing the final resistivity of the inkjet-printed pattern. [ABSTRACT FROM AUTHOR]Copyright of Journal of Materials Chemistry C is the property of Royal Society of Chemistry and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Meker S, Margulis-Goshen K, Weiss E, Braitbard O, Hochman J, Magdassi S, Tshuva EY. Anti-proliferative Activity of Nano-Formulated Phenolato Titanium(IV) Complexes Against Cancer Cells. [Internet]. 2014;(6) :1294. Publisher's Version
Lu Z, Layani M, Zhao X, Tan LP, Sun T, Fan S, Yan Q, Magdassi S, Hng HH. Fabrication of Flexible Thermoelectric Thin Film Devices by Inkjet Printing. [Internet]. 2014;(17) :3551. Publisher's Version
Margulis K, Magdassi S, Lee HS, Macosko CW. Formation of curcumin nanoparticles by flash nanoprecipitation from emulsions. Journal of Colloid And Interface Science [Internet]. 2014;434 :65 - 70. Publisher's VersionAbstract
•A new method for production of organic nanoparticles is demonstrated for curcumin.•The method is based on flash nanoprecipitation from partially water-soluble emulsions.•A simple hand-operated mixer is employed for flash nanoprecipitation process.•Dry nanometric powders obtained by spray drying are easily dispersible in water.•The resultant particles are 40nm in diameter and contain above 20wt% active substance.Nanometric particles of a model hydrophobic substance curcumin were prepared by a novel method, namely, flash nanoprecipitation from a coarse oil-in-water emulsion. The method employs turbulent co-mixing of water with curcumin-loaded emulsion using manually-operated confined impingement jets mixer. A clear and stable dispersion of nanoparticles was formed in this process, and could be converted to dry, easily water-dispersible powder by spray drying. The mean size of the particles was about 40nm by DLS, confirmed by Cryo-TEM. The obtained particles contained 20.4wt% curcumin, X-ray analysis showed it was amorphous. The significant advantages of the studied process are its feasibility, speed and low cost. It does not require any special high-energy input equipment to reduce the droplet size of the initial emulsion as required by the vast majority of other methods, and relies on rapid turbulent mixing and on flow-induced shear stress formed in the simple, manually-operated mixer. Control experiments clearly indicate that employing emulsion, instead of a plain solution and flash nanoprecipitation instead of a simple antisolvent precipitation are advantageous in terms of particle size and stability.
Lim HM, Tan JY, Batabyal SK, Magdassi S, Mhaisalkar SG, Wong LH. Photoactive Nanocrystals by Low-Temperature Welding of Copper Sulfide Nanoparticles and Indium Sulfide Nanosheets. [Internet]. 2014;(12) :3290. Publisher's Version
Katzir E, Yochelis S, Paltiel Y, Azoubel S, Shimoni A, Magdassi S. Review: Tunable inkjet printed hybrid carbon nanotubes/nanocrystals light sensor. Sensors & Actuators: B. Chemical [Internet]. 2014;196 :112 - 116. Publisher's VersionAbstract
In recent years carbon based devices are exploited for a wide range of applications related to electronics and optoelectronics, due to their unique electrical, optical and mechanical properties. Many sensors, emitters, transistors and logic devices use carbon nanotubes as their major building block. Here we present a technology for inkjet printing of a hybrid tunable detector composed of carbon nanotubes and nanocrystals. The printing can be performed on flexible elastic transparent substrates, as well as on a rigid semiconductor or dielectric substrates. The presented detector is low cost, operates at room temperature and can be printed easily in a large format. We show that these types of sensor function with high quantum efficiency due to a gating effect induced by the light excitation.
Reisfeld R, Grinberg M, Levchenko V, Kukliński B, Mahlik S, Magdassi S, Grouchko M. Sol–gel glasses with enhanced luminescence of laser dye Rhodamine B due to plasmonic coupling by copper nanoparticles. Optical Materials [Internet]. 2014;36 (SI: IWASOM'13) :1611 - 1615. Publisher's VersionAbstract
•Copper nanoparticles increase the fluorescence in doped glasses.•Increase the emission of Rh B is result of its interaction with Cu NPs surface plasmons.•Optimal distances would be increase of fluorescence by orders of magnitude.We present the possibility to increase the emission of Rhodamine B (Rh B) as a result of its interaction with surface plasmons (SF) created by copper nanoparticles (Cu NPs). The optical absorption and emission of Rh B with Cu NPs incorporated into glass films formed by sol–gel method were studied by steady state and picosecond spectroscopy. The observed increased luminescence is the result of interaction of the excited state of the dye with scattered light created by copper plasmons and possible energy transfer from the excited Cu NPs which occur at femptosecond time range. The steady state absorption, excitation, fluorescence and lifetimes excited by picosecond pulses were measured. The quantum efficiencies of the films were obtained by comparative method.
Katzir E, Yochelis S, Paltiel Y, Azoubel S, Shimoni A, Magdassi S. Tunable inkjet printed hybrid carbon nanotubes/nanocrystals light sensor. [Internet]. 2014 :112. Publisher's VersionAbstract
In recent years carbon based devices are exploited for a wide range of applications related to electronics and optoelectronics, due to their unique electrical, optical and mechanical properties. Many sensors, emitters, transistors and logic devices use carbon nanotubes as their major building block. Here we present a technology for inkjet printing of a hybrid tunable detector composed of carbon nanotubes and nanocrystals. The printing can be performed on flexible elastic transparent substrates, as well as on a rigid semiconductor or dielectric substrates. The presented detector is low cost, operates at room temperature and can be printed easily in a large format. We show that these types of sensor function with high quantum efficiency due to a gating effect induced by the light excitation.
Liu C, Cao X, Kamyshny A, Law JY, Magdassi S, Long Y. VO.sub.2/Si-Al gel nanocomposite thermochromic smart foils: Largely enhanced luminous transmittance and solar modulation. [Internet]. 2014 :49. Publisher's VersionAbstract
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Tivony R, Larush L, Sela-Tavor O, Magdassi S. Biomedical Imaging of Colorectal Cancer by Near Infrared Fluorescent Nanoparticles. Journal of biomedical nanotechnology. 2014;10 (6) :1041 - 1048.Abstract

In this paper we describe the preparation of novel Near Infrared (NIR) fluorescent nanoparticles for application in medical imaging of colorectal tumors. The nanoparticles are prepared by using only non-covalent binding processes of molecules which are approved for clinical use. The preparation process is based on the precipitation of a polycation, Eudragit-RS, followed by sequential adsorption of a blocking protein, sodium caseinate, NIR fluorescent dye, Indocyanine Green (ICG) and optionally, a targeting molecule, anti-CEA antibody. Fluorescence measurements have shown that these nanoparticles have higher resistance to photobleaching and higher quantum yield relatively to free ICG. Imaging experiments in orthotopic colorectal cancer mice models have shown that these fluorescent nanoparticles are capable of binding to LS174T human colon tumors in vivo with high specificity, even without the targeting molecule. These nanoparticles, composed of all FDA approved materials, open the way to clinical bioimaging and diagnostics of colon cancer.

Kamyshny A, Magdassi S. Conductive Nanomaterials for Printed Electronics. Small. 2014;10 (17) :3515-3535.Abstract

This is a review on recent developments in the field of conductive nanomaterials and their application in printed electronics, with particular emphasis on inkjet printing of ink formulations based on metal nanoparticles, carbon nanotubes, and graphene sheets. The review describes the basic properties of conductive nanomaterials suitable for printed electronics (metal nanoparticles, carbon nanotubes, and graphene), their stabilization in dispersions, formulations of conductive inks, and obtaining conductive patterns by using various sintering methods. Applications of conductive nanomaterials for electronic devices (transparent electrodes, metallization of solar cells, RFID antennas, TFTs, and light emitting devices) are also briefly reviewed.

Azoubel S, Magdassi S. Controlling adhesion properties of SWCNT-PET films prepared by wet depositionControlling adhesion properties of SWCNT-PET films prepared by wet deposition. ACS Applied Materials and Interfaces [Internet]. 2014;6 (12) :9265-9271. Publisher's Version
Cao X, Wang N, Magdassi S, Mandler D, Long Y. Europium Doped Vanadium Dioxide Material: Reduced Phase Transition Temperature, Enhanced Luminous Transmittance and Solar Modulation. [Internet]. 2014;6 (3) :558 - 561. Publisher's VersionAbstract

Vanadium dioxide is a well-known near room temperature phase transition material with a transition temperature (tau(C)) at 68 degrees C. In this paper, Eu3+ dopant with different doping levels was introduced into the crystal lattice of VO2. The thermochromic properties, including the integrated visible transmittance (T-lum) and the solar modulating ability (Delta T-sol) were favorably affected by the Eu-doping. It is of great interest that the substitution of V4+ by Eu3+ in the VO2 crystal structure reduced the tau(C) from 68 degrees C to 47.5 degrees C with an approximate decreasing rate of 6.5 degrees C/at% up to 4 at%. More importantly, the Eu dopant helped in improving the properties of luminous transmittance and solar modulating ability, which were difficult to be achieved by other dopants.

Meker S, Margulis-Goshen K, Magdassi S, Tshuva EY. Hydrolysis Resistant Salan Titanium(IV) Anti-cancer Agents in Nanoparticles. [Internet]. 2014;19 :S650 - S650. Publisher's Version
Shimoni A, Azoubel S, Magdassi S. Inkjet printing of flexible high-performance carbon nanotube transparent conductive films by "coffee ring effect". Nanoscale [Internet]. 2014;6 (19) :11084-11089. Publisher's Version
Grouchko M, Roitman P, Zhu X, Popov I, Kamyshny A, Su HB, Magdassi S. Merging of metal nanoparticles driven by selective wettability of silver nanostructures. Nature communications. 2014;5.Abstract

The welding and sintering of nanomaterials is relevant, for example, to form electrical contacts between metallic particles in printed electronic devices. Usually the welding of nanoparticles is achieved at high temperatures. Here we find that merging of two different metals, silver and gold nanoparticles, occurs on contact at room temperature. The merging process was investigated by experimental and molecular dynamics simulations. We discovered that the merging of these particles is driven by selective wettability of silver nanoparticles, independent of their size and shape (spheres or rods); silver behaves as a soft matter, whereas gold as a hard surface being wetted and retaining its original morphology. During that process, the silver atoms move towards the surface of the Au nanoparticles and wrap the Au nanoparticles in a pulling up-like process, leading to the wetting of Au nanoparticles.

Grouchko M, Roitman P, Zhu X, Popov I, Kamyshny A, Su H, Magdassi S. Merging of metal nanoparticles driven by selective wettability of silver nanostructures. Nature Communications [Internet]. 2014;5 (1) :3213. Publisher's Version
Cao X, Wang N, Law JY, Loo SCJ, Magdassi S, Long Y. Nanoporous Thermochromic VO2 (M) Thin Films: Controlled Porosity, Largely Enhanced Luminous Transmittance and Solar Modulating Ability. [Internet]. 2014;30 (6) :1710 - 1715. Publisher's VersionAbstract

Vanadium dioxide is the most widely researched thermochromic material with a phase transition temperature (tau(c)) of around 68 degrees C, and its thermochromic performance can be enhanced by adding nanoporosity. Freeze-drying has been employed to fabricate nanostructures with different porosities from 16 to 45% by varying the prefreezing temperature and precursor concentration. The luminous transmittance (T-lum) and solar modulating ability (Delta T-sol) are greatly enhanced as a result of increasing pore size and pore density. The freeze-dried sample with 7.5 mL of H2O2 precursor dip-coated at 300 mm/min gives the best combination of thermochromic properties (T-lum approximate to 50%, Delta T-sol = 14.7%), which Surpasses the best combined thermochromic performance reported to date that we are aware of (T-lum approximate to 41%, Delta T-sol = 14.1%).

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