scholarly journals Preparation and Properties of Composite PAN/PANI Membranes

2017 ◽  
Vol 2017 ◽  
pp. 1-14 ◽  
Author(s):  
Beata Fryczkowska ◽  
Zofia Piprek ◽  
Marta Sieradzka ◽  
Ryszard Fryczkowski ◽  
Jarosław Janicki
Keyword(s):  
Surface Morphology ◽  
Transport Properties ◽  
Chemical Properties ◽  
High Sensitivity ◽  
Sensory Properties ◽  
Inversion Method ◽  
Phase Inversion Method ◽  
Physical And Chemical ◽  
Polyacrylonitrile Solution ◽  
Interesting Solution

The methods of modifying PAN membranes have been known and used for many years. An interesting solution seems to be to give the sensory properties to this type of membranes. This paper presents the results of research on the method of obtaining PAN/PANI membranes using phase inversion method from a solution in DMF, following two methods: (1) dissolving both polymers (PAN and PANI) and then coagulating in water or in an aqueous solution of CSA and (2) forming the membranes from polyacrylonitrile solution and coagulation in water, followed by coating of CSA with a solution of TFE. The membranes obtained as a result of the experiment were tested for physical and chemical properties, transport properties, surface morphology, degree of dispersion of composite components, and sensitivity to the presence of dilute acids and bases. FTIR microspectroscopy and scanning electron microscopy were used to study the surface morphology. The sensory properties of membranes that are inherently colored were determined visually and by UV-Vis spectrophotometry. Furthermore, when choosing the method of membrane forming, we can obtain membranes with good physical and chemical and transport properties or ones characterized by high sensitivity to the pH of the solution.

Synthesis of Cu2O and ZnO Nanowires and their Heterojunction Nanowires by Thermal Evaporation: A Short Review

2014 ◽  
Vol 71 (5) ◽  
Author(s):  
Muhammad Arif Khan ◽  
Samsudi Sakrani ◽  
Syahida Suhaima ◽  
Yussof Wahab ◽  
Rosnita Muhammad
Keyword(s):  
Physical Vapor Deposition ◽  
Thermal Evaporation ◽  
Chemical Properties ◽  
High Sensitivity ◽  
Short Review ◽  
Zno Nanowires ◽  
Oxide Semiconductor ◽  
The Individual ◽  
Photovoltaic Solar Cells ◽  
Physical And Chemical

One dimensional metal oxide semiconductor nanowires of copper (I) oxide (Cu2O), zinc oxide (ZnO), and their heterojunction nanowires possess remarkable physical and chemical properties. ZnO and Cu2O areattractive because the metals are abundant on earth, inexpensive, nontoxic.Moreover, these oxides have useful optical and electrical properties suitable for a wide variety of electrical devices, because their electrical conduction can be predictably controlled by doping. We here restrict the disscussion using a Hot Tube Vacuum Thermal Evaporation. The NWs in these devices will be studied by physical vapor deposition known as vapor-liquid-solid (VLS). Therefore, we explore conventional methods, particularly the VLS of growing ZnO and Cu2O nanowires which are assisted by the catalyst.  In this short review, we report the individual and combined (Cu2O/ZnO) junction nanowires by PVD method.  The main advantages of these composite nanowires are the natural p-n characteristics, the broad light absorption, the high sensitivity to humidity changes, and the fast dynamic response. The combination of all characteristics offered by Cu2O/ZnO nanowires can enable the fabrication of diverse sensing devices, and photovoltaic solar cells.

High Sensitivity Humidity Sensor Based on ZnSnO3 Composite Nanocube

2013 ◽  
Vol 594-595 ◽  
pp. 872-876
Author(s):  
N.D. Md Sin ◽  
M.Z. Musa ◽  
M.H. Mamat ◽  
S. Ahmad ◽  
A. Abdul Aziz ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Humidity Sensor ◽  
Chemical Properties ◽  
High Sensitivity ◽  
Physical And Chemical Properties ◽  
Sensor Performance ◽  
Semiconducting Material ◽  
Physical And Chemical ◽  
And Chemical Properties

The performance of nanocomposites semiconducting material used as a sensor is very much depending upon physical and chemical properties of the material. In this paper we address sensitivity of ZnSnO3thin film deposited by hydrothermal deposition in terms of its behavior towards humidity variations. The electrical, optical and structural properties of ZnSnO3thin film deposit at different volume of solvent (50 ml and 70 ml) grown by novel deposition of ZnSnO3hydrothermal with low temperature 95°C are also reviewed. The sensor performance of ZnSnO3thin film prepared at 50 ml volume show high sensitivity towards humidity. Using FESEM it was noted that the nanocube of ZnSnO3thin films growth on ZnO template with the size of nanocube is 100 to 140nm by varying the volume of the solvent.

scholarly journals Characteristics of polyurethane-based sustained release membranes for drug delivery

2013 ◽  
Vol 11 (4) ◽  
pp. 542-553 ◽  
Author(s):  
Mihaela Mândru ◽  
Constantin Ciobanu ◽  
Stelian Vlad ◽  
Maria Butnaru ◽  
Laurent Lebrun ◽  
...  
Keyword(s):  
Surface Morphology ◽  
Physicochemical Characterization ◽  
Dermal Fibroblasts ◽  
Attenuated Total Reflection ◽  
Inversion Method ◽  
Scanning Calorimetry ◽  
Force Microscopy ◽  
Atomic Force ◽  
Polyurethane Membranes ◽  
Phase Inversion Method

AbstractThis paper is focused on the preparation and physicochemical characterization of two poly(ester ether urethane)s with rifampicin in their matrix and different molar concentrations of urethane groups. The polyurethanes with rifampicin were processed as asymmetrical microporous membranes by a phase inversion method and characterized by attenuated total reflection — Fourier transform infrared (ATR-FTIR) spectroscopy and differential scanning calorimetry (DSC). The influence of the surface morphology in the release of drug compounds was analyzed by scanning electron microscopy (SEM), atomic force microscopy (AFM), contact angle, and water uptake. The release of rifampicin depends on the molar concentration of urethane groups and also on the surface morphology of the polyurethane membranes. The antibacterial activity was evaluated with S. Epidermidis RP 62 A and P. Aeruginosa ATCC 1544. Finally, the biocompatibility of the polyurethane membranes was studied with human dermal fibroblasts (HDF) to evaluate the potential biomedical applications.

scholarly journals Effect of singeing methods on carcass qualities and sensory properties of red Sokoto buck muscle

2018 ◽  
Vol 34 (4) ◽  
pp. 443-453
Author(s):  
Ani Ugochukwu ◽  
Jiya Zhiri ◽  
Ocheme Boniface
Keyword(s):  
Crude Protein ◽  
Chemical Properties ◽  
Sensory Properties ◽  
Hot Water ◽  
Carcass Quality ◽  
Mineral Contents ◽  
University Of Technology ◽  
Sensory Parameters ◽  
Meat Samples ◽  
Physical And Chemical

An experiment was conducted using twenty four red Sokoto bucks to evaluate effect of singeing methods on the carcass quality and sensory properties of red Sokoto buck (Chevon) meat. The study was carried out at the Animal Production Teaching and Research laboratory, Federal University of Technology Minna. The buck carcasses were randomly allocated to four singeing methods of hot water, firewood, rubber tyre and kerosene singeing after slaughter. Data were collected on the sensory parameters, mineral composition, physical and chemical properties and proximate composition. Singeing methods significantly (P<0.05) affects the crude protein and fat contents of the meat samples with crude protein significantly (P<0.05) higher in rubber tyre (31.53%) singed carcasses. While the fat content were significantly (P<0.05) higher in hot water (5.80%) singed carcasses. The mineral contents differs significantly (P<0.05) among singeing methods. The pH and thermal shortening were significantly (P<0.05) higher in buck carcasses singed with kerosene (6.75 and 35.35 respectively). Methods of singeing had significant effect on the carcass quality and sensory properties of meat samples. It was therefore concluded that hot water be used to remove hairs in slaughtered goat carcasses, as this will reduce to practicable level cross contamination of meat during processing. The use of firewood, tyre and kerosene should be total discouraged in meat processing and the public should be educated about the health implication of consuming animal carcasses singed with these methods.

scholarly journals Preparation and properties of cellulose membranes with graphene oxide addition

2017 ◽  
Vol 19 (4) ◽  
pp. 41-49 ◽  
Author(s):  
Beata Fryczkowska ◽  
Kamil Wiechniak
Keyword(s):  
Graphene Oxide ◽  
Phase Inversion ◽  
Chemical Properties ◽  
Composite Membranes ◽  
Inversion Method ◽  
Permeate Flux ◽  
Oxide Addition ◽  
Physico Chemical ◽  
Cellulose Membranes ◽  
Phase Inversion Method

Abstract The paper presents results of research on the preparation of cellulose membranes with graphite oxide addition (GO/CEL). Initially, a cellulose (CEL) solution in 1-ethyl-3-methylimidazole acetate (EMIMAc) was obtained, to which graphene oxide (GO) dispersed in N,N-dimethylformamide (DMF) was added. From this solution, composite membranes were formed using phase inversion method. It was observed that the GO addition influences the physico-chemical properties of GO/CEL composite membranes, resulting in an increase in their mass per unit area, thickness and density, and a decrease in sorption properties. In addition, the study of transport properties has shown that GO/CEL membranes do not absorb BSA particles on their surface, which prevents the unfavorable phenomenon of fouling. An important feature of the obtained membranes is the specific permeate flux which reaches high values (~124 L/m2×h) at 3.8% of the GO addition to the cellulose matrix.

The crystal structure and electrical/thermal transport properties of Li1−xSn2+xP2 and its performance as a Li-ion battery anode material

2021 ◽  
Author(s):  
Yosuke Goto ◽  
Shota Nakanishi ◽  
Yusuke Nakai ◽  
Takeshi Mito ◽  
Akira Miura ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Transport Properties ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Li Ion Battery ◽  
Local Ordering ◽  
Li Ion ◽  
Physical And Chemical ◽  
Battery Anode ◽  
And Chemical Properties

The physical and chemical properties of Li1−xSn2+xP2 are affected by Li/Sn mixed occupation with local ordering.

scholarly journals Research Progress of Gas Sensing Performance of 2D Hexagonal WO3

2021 ◽  
Vol 9 ◽  
Author(s):  
Yueqi Li ◽  
Qin Zhou ◽  
Shoubing Ding ◽  
Zhimin Wu
Keyword(s):  
Gas Sensing ◽  
Low Cost ◽  
Chemical Properties ◽  
High Sensitivity ◽  
Oxide Semiconductor ◽  
Research Progress ◽  
Research Directions ◽  
Sensor Field ◽  
Sensitivity And Selectivity ◽  
Physical And Chemical

Metal oxide semiconductor gas sensing materials have attracted great research interest in the gas sensor field due to their outstanding physical and chemical properties, low cost, and easy preparation. Among them, two-dimensional hexagonal tungsten trioxide (2D h-WO3) is especially interesting because of its high sensitivity and selectivity to some gases. We firstly introduce the characteristics of 2D h-WO3 gas sensing materials and discuss the effects of microstructure, oxygen vacancy, and doping modification on the gas sensing properties of 2D h-WO3 mainly. Finally, we explore the application of 2D h-WO3 gas sensing materials and propose some research directions.

scholarly journals THE STUDY OF NATURAL POLYSACCHARIDES: ORGANOLEPTIC, PHYSICAL, CHEMICAL, MICROBIOLOGICAL PROPERTIES, AND THERMODYNAMIC CHARACTERISTICS OF AQUEOUS SOLUTIONS

2016 ◽  
pp. 72-79
Author(s):  
Dar’ya Belova ◽  
Dar’ya Belova ◽  
Lyubov Dyshlyuk ◽  
Lyubov Dyshlyuk
Keyword(s):  
Aqueous Solutions ◽  
Biodegradable Polymers ◽  
Chemical Properties ◽  
Thermodynamic Characteristics ◽  
High Sensitivity ◽  
Raw Material ◽  
Scanning Calorimetry ◽  
Safety Standards ◽  
Kappa Carrageenan ◽  
Physical And Chemical

Natural polysaccharides is a promising raw material for biodegradable polymers production. To properly select sources of their origin would require conformity with safety standards in force for the similar products. This work conducts a study with a view to examine the extent to which the organoleptic, physical and chemical properties of the polysaccharides in question, as well as their safety indicators conform with the provisions of GOST 16280-2002, CAS 11114-20-8 and CAS 9004-65-3. It is determined that the samples selected, namely, agar-agar produced by Panreac (Germany) and Helicon (USA), carrageenan produced by Boc Sciences (USA) and Newgreen Pharmchem Co. (China) and hydroxypropylmethyl cellulose produced by Acros (Belgium) and Ashland Aqualon Functional Ingredients (USA), meet safety requirements for this type of raw material. Simultaneously, we employ high-sensitivity differential scanning calorimetry method to analyze thermodynamic characteristics of natural polysaccharides’ aqueous solutions. It is shown that gels based on agar-agar have high melting temperature and can withstand temperature rise; after, their microscopic structure is not affected by thermal history, and the gel system remains stable. Thermodynamically, aqueous solution of kappa-carrageenan forms more stable gel than iota-carrageenan; strength and melting point of kappa-carrageenan gels can be adjusted by changing the concentration of potassium chloride in the solution. Aqueous solutions of hydroxypropylmethylcellulose are thermodynamically stable. The experimental data obtained confirm the feasibility of natural polysaccharides application in the production of biodegradable polymers.

scholarly journals Comparison of sensory and rheological properties of green cosmetic creams prepared on different natural, ECOCERT and BDIH certificated self-emulsifying bases

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Katarzyna Wojciechowska ◽  
Adrianna Walczak ◽  
Ewelina Rostowska ◽  
Ewa Poleszak
Keyword(s):  
Rheological Properties ◽  
Apparent Viscosity ◽  
Sensory Analysis ◽  
Chemical Properties ◽  
Sensory Properties ◽  
Physical And Chemical Properties ◽  
Physical Tests ◽  
Study Participants ◽  
Physical And Chemical ◽  
And Chemical Properties

Abstract The objective of this paper was to evaluate and compare the rheological and sensory properties of six natural cosmetic creams that use ECOCERT certificated emulsifying bases: Beautyderm, Dub Base Expert, Simulgreen™ 18-2, Olivem 1000, Montanov L and Emulgin Succro against two synthetics: Granthix APP and Lanette W. The use of emulsifying bases in formulas helps to stabilize the product and improve its rheological and sensory attributes. In this study, the physical and chemical properties of several prepared cosmetic creams were determined. Apparent viscosity and thixotropy were evaluated by viscosimeter, while spreadability was ascertained by extensometer. Moreover, a group of 10 trained members evaluated the sensory properties of the formulas. The obtained formulas based upon natural emulsifiers are characterized by very good physical and chemical properties, high stabilization and good usage quality. The results were confirmed by sensory analysis. The cosmetic creams made with synthetic emulsifying bases were rated the worst by the study participants, which correlated with the physical tests.

scholarly journals Influence of water on the physical properties of olivine, wadsleyite, and ringwoodite

2021 ◽  
Vol 33 (1) ◽  
pp. 39-75
Author(s):  
Bao-Hua Zhang ◽  
Qun-Ke Xia
Keyword(s):  
Physical Properties ◽  
Transport Properties ◽  
Experimental Studies ◽  
Chemical Properties ◽  
Integrated Approach ◽  
Mantle Minerals ◽  
Technological Advances ◽  
Influence Of Water ◽  
Geodynamic Processes ◽  
Physical And Chemical

Abstract. The incorporation of water in nominally anhydrous minerals plays a crucial role in many geodynamic processes and evolution of the Earth and affects the physical and chemical properties of the main constituents of the Earth's mantle. Technological advances now allow the transport properties of minerals to be precisely measured under extreme conditions of pressure and temperature (P and T) that closely mimic the P–T conditions throughout much of the Earth's interior. This contribution provides an overview of the recent progress in the experimental studies on the influence of water on physical properties (i.e., diffusivity, electrical conductivity, thermal conductivity, sound velocity, and rheology) of olivine, wadsleyite, and ringwoodite together with their applications. In particular, consistency among various experimental data is investigated, discrepancies are evaluated, and confusions are clarified. With such progress in the experimental determination of transport properties of major mantle minerals, we can expect new insights into a broad range of geoscience problems. Many unresolved issues around water inside Earth require an integrated approach and concerted efforts from multiple disciplines.

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