Dark matters: black-PDMS nanocomposite for opaque microfluidic systems

2019 ◽  
Vol 21 (5) ◽  
pp. 2719-2726 ◽  
Author(s):  
Vania Silverio ◽  
Ana V. Silva ◽  
Kacper Przykaza ◽  
Luis F. Santos ◽  
Luis V. Melo ◽  
...  
Keyword(s):  
Optical Properties ◽  
Physical Properties ◽  
Microfluidic Systems ◽  
Dark Matters

A black nanocomposite was used to tune optical properties of PDMS and its effect on surface physical properties was determined.

scholarly journals Rational construction of a library of M29 nanoclusters from monometallic to tetrametallic

2019 ◽  
Vol 116 (38) ◽  
pp. 18834-18840 ◽  
Author(s):  
Xi Kang ◽  
Xiao Wei ◽  
Shan Jin ◽  
Qianqin Yuan ◽  
Xinqi Luan ◽  
...  
Keyword(s):  
Optical Properties ◽  
Physical Properties ◽  
In Situ Synthesis ◽  
Atomic Level ◽  
Metal Exchange ◽  
Alloy Nanoparticles ◽  
Synergetic Effects ◽  
Rational Construction ◽  
Target Metal

Exploring intermetallic synergy has allowed a series of alloy nanoparticles with prominent chemical–physical properties to be produced. However, precise alloying based on a maintained template has long been a challenging pursuit, and little has been achieved for manipulation at the atomic level. Here, a nanosystem based on M29(S-Adm)18(PPh3)4 (where S-Adm is the adamantane mercaptan and M is Ag/Cu/Au/Pt/Pd) has been established, which leads to the atomically precise operation on each site in this M29 template. Specifically, a library of 21 species of nanoclusters ranging from monometallic to tetrametallic constitutions has been successfully prepared step by step with in situ synthesis, target metal-exchange, and forced metal-exchange methods. More importantly, owing to the monodispersity of each nanocluster in this M29 library, the synergetic effects on the optical properties and stability have been mapped out. This nanocluster methodology not only provides fundamental principles to produce alloy nanoclusters with multimetallic compositions and monodispersed dopants but also provides an intriguing nanomodel that enables us to grasp the intermetallic synergy at the atomic level.

scholarly journals Physical Properties of the Interplanetary Dust

1971 ◽  
Vol 12 ◽  
pp. 377-388
Author(s):  
Martha S. Hanner
Keyword(s):  
Optical Properties ◽  
Spatial Distribution ◽  
Chemical Composition ◽  
Physical Properties ◽  
Physical Nature ◽  
Interplanetary Dust ◽  
Physical Structure ◽  
Dust Particles ◽  
Cometary Material ◽  
Direct Condensation

The interplanetary dust may be composed of cometary material, interstellar grains, debris from asteroidal collisions, primordial material formed by direct condensation, or contributions from all of these sources. Before we can determine the origin of the dust, we need to know its physical nature, spatial distribution, and the dynamical forces that act on the particles. The spatial distribution and dynamics are separately treated in this symposium by Roosen. We discuss here the physical characteristics of the dust particles: their size distribution, chemical composition, physical structure, and optical properties.

Manufacturing process and optical properties of zinc oxide thin films as photoanode in DSSC

2018 ◽  
Vol 1 (86) ◽  
pp. 33-40
Author(s):  
Wiktor Matysiak ◽  
Tomasz Tański ◽  
Marta Zaborowska
Keyword(s):  
Thin Films ◽  
Zinc Oxide ◽  
Optical Properties ◽  
Solar Cells ◽  
Physical Properties ◽  
Dye Sensitized Solar Cells ◽  
Zno Thin Films ◽  
Oxide Thin Films ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

Purpose: It has been recently observed, that zinc oxide thin films are gaining much popularity, particularly in applications such as toxic gas sensors, photocatalytic materials and photovoltaic cells. Due to much better physical properties of ZnO compared to the ones of titanium dioxide (TiO2), which is currently the most used material in dye sensitized solar cells, efforts are being made to fabricate DSSCs with thin films and/or nanostructures, including nanowires, nanofibres and nanoparticles of zinc oxide. Design/methodology/approach: In this paper, zinc oxide thin films were prepared using sol-gel and spin coating methods from Zn(COO)2 x 2H2O dissolved in ethanol and acetic acid with ZnO monocrystalline nanoparticles of 0 and 10% (wt.) relative to the final concentration of produced solutions. The effect of calcination process on ZnO thin films at 600°C were examined using atomic force microscope to investigate the morphology of semiconductor coatings, infrared spectroscopy to prove the chemical structure of material. Besides, optical properties were analysed on the basis of absorbance in the function of wavelength spectra and the values of energy band gaps were studied. Findings: The topography analysis of ZnO thin films showed an increase in roughness with the increase of zinc oxide nanoparticles in the thin films material. In addition, the analysis of the optical properties of ZnO thin films showed a decrease in absorption level in the range of near-ultraviolet wavelength for the obtained layers after annealing. Research limitations/implications: It was found that ZnO thin films produced by spin coating and calcination method are a proper material for photoanode in dye-sensitized solar cells, as zinc oxide layers provide better conductivity across the photovoltaic cell. Practical implications: The results provide the possibility of production DSSCs with zinc oxide thin films as photoanode. Originality/value: The dye-sensitized solar cells based on zinc oxide photoanodes could be alternative semiconductor material to titanium dioxide, which is used in nowadays solar cells. It was estimated that ZnO, especially zinc oxide nanostructures have much better physical properties, than TiO2 structures. What is more, zinc oxide thin layers are characterized by the lower energy losses resulting from the physical properties of such nanostructures, which results in more efficient solar energy into electricity conversion.

Tuning of electrical and optical properties of polyaniline incorporated functional paper for flexible circuits through oxidative chemical polymerization

RSC Advances ◽  
2016 ◽  
Vol 6 (97) ◽  
pp. 94795-94802 ◽  
Author(s):  
Krishna Deb ◽  
Arun Bera ◽  
Biswajit Saha
Keyword(s):  
Optical Properties ◽  
Physical Properties ◽  
Organic Semiconductor ◽  
Electrical And Optical Properties ◽  
Paper Substrate ◽  
Chemical Polymerization ◽  
Functional Paper

An organic semiconductor polyaniline based material with outstanding physical properties was prepared on a flexible paper substrate.

scholarly journals On the optical and physical properties of tabasheer. By David Brewster, LL. D. F. R. S. Lond. and Edin. In a letter to the Right Hon. Sir Joseph Banks, Bart. G. C. B. P. R. S. &c

1833 ◽  
Vol 2 ◽  
pp. 115-116
Keyword(s):  
Optical Properties ◽  
Specific Gravity ◽  
Physical Properties ◽  
The State ◽  
Index Of Refraction ◽  
Flint Glass ◽  
The Third ◽  
Refractive Power ◽  
The Absolute ◽  
The Right

Tabasheer is a substance found in the cavities of the bamboo, existing originally in the state of a transparent fluid, but gradually indurating into a solid of different degrees of hardness: it consists of 70 silica, + 30 potash and lime. One variety has a milky transparency, transmitting a yellowish, and reflecting a bluish light; another is translucent, and a third opake: the two first varieties become transparent, and evolve air when immersed in water: the third evolves air also, but remains opake. If the first varieties be only slightly wetted they become quite opake. The property of acquiring transparency by the evolution of air from, and the absorption of water by its pores, belongs also to the hydrophanous opal; but the faculty of becoming opake by a small quantity, and transparent by a larger, of water, shows a singularity of structure in tabasheer. As the tabasheer disengages more air than hydrophane, its pores must be more numerous; and therefore the transmission of light, so as to form a perfect image, indicates either a very feeble refractive power or some peculiarity in the construction of its pores. To determine this, Dr. Brewster formed a prism of tabasheer with an angle of 34° 15', and upon measuring its refractive power found it very low, though various in different specimens, the index of refraction varying from 1·11 to 1·18, that of water being 1·33, of flint-glass 1·60, of sulphur 2·11, of phosphorus 2·22, and of the diamond 2·47. So that tabasheer has a lower refractive power than any other solid or liquid, and holds an intermediate place between water and the gases. Dr. Brewster then gives a formula for computing the absolute refractive power of bodies, and a table of results, from which it appears that, in this respect, the refractive power of tabasheer is so low as to be separated by a considerable interval from all other bodies. The author next proceeds to detail a variety of experiments upon the absorbent powers of the different kinds of tabasheer, in respect to several liquids, and the corresponding effects upon its optical properties and specific gravity, and concludes with observations on the cause of the paradox exhibited by the transparent tabasheer, in becoming opake by absorbing a small quantity of water, and transparent when the quantity is increased.

scholarly journals Tunable physical properties in BiAl1−xMnxO3 thin films with novel layered supercell structures

2020 ◽  
Vol 2 (1) ◽  
pp. 315-322 ◽  
Author(s):  
Shikhar Misra ◽  
Leigang Li ◽  
Xingyao Gao ◽  
Jie Jian ◽  
Zhimin Qi ◽  
...  
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Physical Properties ◽  
Layered Structures ◽  
Molar Ratio

Morphology tuning of Bi-based layered structures by varying the Al : Mn molar ratio leads to tunable magnetic and optical properties.

scholarly journals Crystal Structures and Optical Properties of Two Novel 1,3,5-Trisubstituted Pyrazoline Derivatives

Crystals ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 467
Author(s):  
Qi Feng ◽  
Wenhui Huan ◽  
Jiali Wang ◽  
Jiadan Lu ◽  
Guowang Diao ◽  
...  
Keyword(s):  
Optical Properties ◽  
Charge Transfer ◽  
Solid State ◽  
Physical Properties ◽  
Intramolecular Charge Transfer ◽  
Solvent Polarity ◽  
Dihedral Angles ◽  
Polar Solvents ◽  
X Ray ◽  
X Ray Crystallography

Two novel 1,3,5-trisubstituted pyrazoline derivatives—1-acetyl-3-(4-methoxyphenyl)-5-(6-methoxy-2-naphthyl)-pyrazoline (2a) and 1-(4-nitrophenyl)-3-(4-methoxyphenyl)-5-(6-methoxy-2-naphtyl)-pyrazoline (2b)—were synthesized and their structures were determined by single crystal X-ray crystallography. Both of the two crystals exhibit twisted structures due to the large dihedral angles between the pyrazolinyl ring and the aromatic ring at the 5-position (88.09° for 2a and 71.26° for 2b). The optical–physical properties of the two compounds were investigated. The fluorescent emission of 2b arises from the 1,3-disubstituted pyrazoline chromophores and exhibits a red shift in polar solvents and solid-state, which could be attributed to photo-induced intramolecular charge transfer (ICT) from N1 to C3 in the pyrazoline moiety and the intermolecular interactions within the crystal. The fluorescent emissions of 2a (λmax 358–364 nm) in solvents and solid-state both come from 6-methoxy-2-naphthyl chromophores, which are fairly insensitive to the solvent polarity.

Characterization Of Pathological Skin Sample By Polarimetric Technique

2015 ◽  
Vol 6 (1) ◽  
Author(s):  
Anil Gupta ◽  
C LP Gupta ◽  
Purnima Bharti ◽  
Devash Kumar
Keyword(s):  
Experimental Study ◽  
Optical Properties ◽  
Light Intensity ◽  
Physical Properties ◽  
Biological Tissue ◽  
Incident Light ◽  
Polarization State ◽  
Skin Sample ◽  
Skin Changes

Measurement of optical properties of skin is an expanding and growing field of research. Recent studies have shown that the biological tissue, especially skin changes the polarization state of the incident light. Using this property will enable the study of abnormalities and diseases that alter not only the light intensity but also its polarization state. We have tried an experimental study for measuring changes of polarization state of the light scattered from skin sample. Using the strokes vector and Mueller matrix notation we have shown that some elements of matrix were sensitive to the changes of the polarization when physical properties of the scatters are changed with sample.

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