scholarly journals Physico-Chemical Properties of a Hybrid Biomaterial (PVA/Chitosan) Reinforced with Conductive Fillers

2021 ◽  
Vol 11 (7) ◽  
pp. 3040
Author(s):  
A. Olarte-Paredes ◽  
J.N. Salgado-Delgado ◽  
E. Rubio-Rosas ◽  
A.M. Salgado-Delgado ◽  
H. Hernández-Cocoletzi ◽  
...  
Keyword(s):  
Morphological Analysis ◽  
Chemical Properties ◽  
Ftir Analysis ◽  
Mechanical Tension ◽  
Nyquist Diagram ◽  
Energy Diffusion ◽  
Tension Tests ◽  
Physico Chemical ◽  
The Matrix ◽  
Conductive Fillers

In this study, a novel hybrid material based on Polyvinyl Alcohol-Chitosan (PVA-Chi) was made, reinforced with conductive fillers such as the polypyrrole (PPy), Poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT: PSS), carbon black (CB), and multi-wall carbon nanotube (MWCNT). In order to observe the mechanical and electrical responses of this composite material, for obtaining composite materials, and to characterize them for the development of applications in engineering, FTIR analysis made clear the different functional groups present in the matrix and the fillers used. Using quaternary mixtures (4 fillers) increased the contact angle, which increased hydrophobicity of the biocomposite. The Nyquist diagram of the analyzed samples showed a decrease in resistance and energy diffusion; the latter because of transferring electrons caused by the conductive polymers CB and the MWCNT. In the mechanical tension tests, Young’s modulus values of 18.386 MPa were obtained, in contrast with the material matrix of PVA-Chi, which showed values of 11.628 MPa. Morphological analysis by SEM showed the materials got were homogeneous. The materials got showed higher electrical conductivity in the OH’s presence and NH2 groups, which could have possible applications in biopolymer electrodes.

scholarly journals Physico-Chemical Properties of a Hybrid Biomaterial (Pva/Chitosan) Reinforced With Conductive Fillers

2021 ◽  
Author(s):  
A. Olarte ◽  
J.N. Salgado ◽  
E. Rubio ◽  
R. Salgado ◽  
H. Hernandez ◽  
...  
Keyword(s):  
Morphological Analysis ◽  
Conductive Polymer ◽  
Chemical Properties ◽  
Nyquist Diagram ◽  
Multi Wall Carbon Nanotubes ◽  
Tension Tests ◽  
Physico Chemical ◽  
The Matrix ◽  
Conductive Fillers ◽  
Polymer Fillers

A novel hybrid material based on Polyvinyl alcohol-Chitosan (PVA-Cs) was made, reinforced with conductive polymer fillers such as polypyrrole (PPy), Poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS), carbon black (CB) and multi-wall carbon nanotubes (MW CNT). Our proposal is to use these fillers, which have not been studied in this context before, for obtaining composite materials, and to characterize them for the development of applications in microelectronics. FTIR analysis made evident the different func-tional groups present in the matrix and the fillers used. The use of quaternary mixtures (4 fillers) increased the contact angle, which increased the degree of hydrophobicity of the biocomposite. The Nyquist diagram of the analyzed samples showed a decrease in resistance and energy diffu-sion; the latter due to the transfer of electrons caused by the conductive polymers CB and the MWCNT. In the mechanical tension tests, Young's modulus values of 18.386 MPa were obtained, in contrast with the material matrix of PVA-Cs, which showed values of 11.628 MPa. Further-more, morphological analysis by SEM showed that the materials obtained were homogeneous, with no phase formation. The materials obtained showed higher electrical conductivity in the presence of the OH and NH2 groups, which could have possible applications in biopolymer elec-trodes.

scholarly journals Recycling of buffing dust tanneries waste to prepare structural thermal insulation panels

2021 ◽  
Author(s):  
Wajad Ulfat ◽  
Ayesha Mohyuddin ◽  
Muhammad Amjad ◽  
Shagufta Saeed ◽  
Beenish Mujahid
Keyword(s):  
Thermal Insulation ◽  
Chemical Properties ◽  
Composite Panels ◽  
Ftir Analysis ◽  
Leather Industry ◽  
Weight Percentage ◽  
Blowing Agent ◽  
Physico Chemical ◽  
Sem Study ◽  
Prepared Composite

Abstract Thermal insulation panels were prepared by mixing the buffing dust obtained from tanneries waste with the polystyrene. The ratio in weight percentage of buffing dust, polystyrene and blowing agent was 20:77:3 respectively in these panels. The samples were prepared in co-twine extruder at 210 oC. Different physico-chemical properties were investigated for these samples that are required to analyze the usability of a material for construction. The composite panels showed better thermal insulation characteristics than the simple polystyrene boards. This study demonstrated that prepared composite panels have good thermal conductivity (0.029 W/m-K at 27 oC), density (300 Kg/m3), compression strength (6.25 ton) and water absorption (7.5%) without degradation of mechanical properties. Thermogravimetric analysis depicted that composite panels were thermally stable from 200 oC to 412 oC. FTIR analysis showed that composite has carbonyl and free amino functional groups. The SEM study explained that voids were created in the composite and homogeneousity was decreased after the addition of buffing dust. The composite had 62% of carbon and 0.2% of chromium as determined by EDX analysis. The results suggested that the prepared composite panels can be used as thermal insulation boards in building sector which will help in the recycling of waste produced by leather industry and consequently a reduction in environmental pollution.

scholarly journals Kinetics of transesterification of Madhuca Indica oil over modified zeolites: biodiesel synthesis

2015 ◽  
Vol 50 (4) ◽  
pp. 271-278 ◽  
Author(s):  
SR Pratap ◽  
SZM Shamshuddin ◽  
N Thimmaraju ◽  
M Shyamsundar ◽  
SS Reena
Keyword(s):  
Catalytic Activity ◽  
Chemical Properties ◽  
Ftir Analysis ◽  
Reaction Conditions ◽  
Physico Chemical ◽  
Biodiesel Synthesis ◽  
Basic Zeolites ◽  
Modified Zeolites ◽  
Kinetics Of ◽  
Nay Zeolites

In this article production of biodiesel from Madhuca indica oil (MI-oil) containing high % of free fatty acids (FFA) by transesterification process with methanol over basic zeolites such as NaY loaded with 5-25% KOH is presented. The zeolites were characterized by PXRD, BET and CO2-TPD methods prior to their catalytic activity studies. Optimization of reaction conditions for transesterification was conducted in order to get highest possible yield of biodiesel. 1HNMR and FTIR analysis confirms the conversion of MI-oil to biodiesel. The physico-chemical properties of MI-biodiesel were found to be comparable with that of the standard biodiesel. The NaY and KOH/NaY zeolites were found to be efficient and reusable catalysts without much loss of their catalytic activity when used for several times in biodiesel production.Bangladesh J. Sci. Ind. Res. 50(4), 271-278, 2015

Paper 6: Physical Characteristics of Articular Cartilage

1966 ◽  
Vol 181 (10) ◽  
pp. 16-24 ◽  
Author(s):  
J. Edwards
Keyword(s):  
Fluid Flow ◽  
Articular Cartilage ◽  
Experimental Work ◽  
Chemical Properties ◽  
Physical Factors ◽  
Stress Strain ◽  
Physical Behaviour ◽  
Physico Chemical ◽  
Joint Lubrication ◽  
The Matrix

Since articular cartilage is the principal wear resisting tissue in animal joints, an understanding of its physical behaviour is of particular importance in studies of animal joint lubrication. This review is concerned with the physical factors involved in rheology of cartilage. Particular attention is paid to the physico-chemical properties of its matrix and to the nature of forces acting between its liquid and solid components. The experimental work reviewed includes studies of the interrelations between stress, strain, fluid flow, and time during compression and swelling of the tissue, and of transport of liquid through the matrix. The mechanism which controls the behaviour of cartilage during compression and swelling is discussed.

Influence of the Titanium Dioxide Addition in Matrix Formulation on the Radwaste-Mortar Matrix Characteristics

1995 ◽  
Vol 412 ◽  
Author(s):  
Aleksandar D. Perić
Keyword(s):  
Titanium Dioxide ◽  
Mechanical Strength ◽  
Chemical Properties ◽  
High Water ◽  
Matrix Formulation ◽  
Leach Rate ◽  
Physico Chemical ◽  
The Matrix ◽  
Ph Range ◽  
Mortar Matrix

AbstractThe rutile form of titanium dioxide (TiO2) was added to mortar matrix preparations with the objective to improve the mechanical and physico-chemical characteristics of the radwaste-mortar matrix mixtures, in particular the leach-rate of the immobilized radionuclide. The final solidified radwaste form was made with high water-to-cement ratio (0.36) for easy leaching of the immobilized radionuclide, 37Cs. TiO2was added to the mortar formulation, replacing the appropriate amount of cement, in the amounts of 1,2,5,8 and 10 weight percents of total cement weight. In the highly basic environment of the mortar (pH ≅ 12), the titanium will form a HTiO-type membrane, which is semi-permeable and selective for the cations like Cs+ in the pH range above 5.5. Only the rutile form of TiO2was observed in the prospected radwastemortar mixture samples, using X-ray Fluorescence Spectrometry. Nevertheless, 137Cs leach-rate for the matrix formulations prepared with TiO2 was notably lower than the normally prepared (TiO2 free) samples. Furthermore, the mechanical strength of the samples prepared with TiO2 was higher than that of the TiO 2-free samples, and the correlation between the mechanical strength and TiO2 content appears to be exponential over the composition range explored here. Improvement of the physico-chemical properties of the titanium prepared formulations, is a topic of further investigations.

Decoration of specific sites on freeze-fractured membranes

1978 ◽  
Vol 36 (2) ◽  
pp. 140-141
Author(s):  
H. Gross ◽  
H. Moor
Keyword(s):  
Pure Water ◽  
Freeze Fracture ◽  
Chemical Properties ◽  
Surface Forces ◽  
Sulfate Pentahydrate ◽  
Copper Sulfate Pentahydrate ◽  
Physico Chemical ◽  
Water Of Hydration ◽  
Small Container ◽  
Binding Forces

Fracturing under ultrahigh vacuum (UHV, p ≤ 10-9 Torr) produces membrane fracture faces devoid of contamination. Such clean surfaces are a prerequisite foe studies of interactions between condensing molecules is possible and surface forces are unequally distributed, the condensate will accumulate at places with high binding forces; crystallites will arise which may be useful a probes for surface sites with specific physico-chemical properties. Specific “decoration” with crystallites can be achieved nby exposing membrane fracture faces to water vopour. A device was developed which enables the production of pure water vapour and the controlled variation of its partial pressure in an UHV freeze-fracture apparatus (Fig.1a). Under vaccum (≤ 10-3 Torr), small container filled with copper-sulfate-pentahydrate is heated with a heating coil, with the temperature controlled by means of a thermocouple. The water of hydration thereby released enters a storage vessel.

The microstructure of a TiB2/Ti-47 Al composite material

1989 ◽  
Vol 47 ◽  
pp. 674-675
Author(s):  
O. Popoola ◽  
A.H. Heuer ◽  
P. Pirouz
Keyword(s):  
Composite Material ◽  
Ion Beam ◽  
Chemical Properties ◽  
Intermetallic Alloys ◽  
Transmission Electron ◽  
Diamond Polishing ◽  
Al Composite ◽  
The Matrix ◽  
Argon Ion ◽  
And Chemical Properties

The addition of fibres or particles (TiB2, SiC etc.) into TiAl intermetallic alloys could increase their toughness without compromising their good high temperature mechanical and chemical properties. This paper briefly discribes the microstructure developed by a TiAl/TiB2 composite material fabricated with the XD™ process and forged at 960°C.The specimens for transmission electron microscopy (TEM) were prepared in the usual way (i.e. diamond polishing and argon ion beam thinning) and examined on a JEOL 4000EX for microstucture and on a Philips 400T equipped with a SiLi detector for microanalyses.The matrix was predominantly γ (TiAl with L10 structure) and α2(TisAl with DO 19 structure) phases with various morphologies shown in figure 1.

Physico-Chemical Properties of Recombinant Desulphatohirudin

1990 ◽  
Vol 63 (03) ◽  
pp. 499-504 ◽  
Author(s):  
A Electricwala ◽  
L Irons ◽  
R Wait ◽  
R J G Carr ◽  
R J Ling ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Gel Filtration ◽  
Chemical Properties ◽  
Alpha Helix ◽  
Apparent Molecular Weight ◽  
Correlation Spectroscopy ◽  
Nmr Studies ◽  
Recombinant Hirudin ◽  
Physico Chemical ◽  
Recombinant Molecule

SummaryPhysico-chemical properties of recombinant desulphatohirudin expressed in yeast (CIBA GEIGY code No. CGP 39393) were reinvestigated. As previously reported for natural hirudin, the recombinant molecule exhibited abnormal behaviour by gel filtration with an apparent molecular weight greater than that based on the primary structure. However, molecular weight estimation by SDS gel electrophoresis, FAB-mass spectrometry and Photon Correlation Spectroscopy were in agreement with the theoretical molecular weight, with little suggestion of dimer or aggregate formation. Circular dichroism studies of the recombinant molecule show similar spectra at different pH values but are markedly different from that reported by Konno et al. (13) for a natural hirudin-variant. Our CD studies indicate the presence of about 60% beta sheet and the absence of alpha helix in the secondary structure of recombinant hirudin, in agreement with the conformation determined by NMR studies (17)

Physico-chemical properties of the rare-earth metals, scandium, and yttrium

1963 ◽  
Vol 79 (2) ◽  
pp. 263-293 ◽  
Author(s):  
E.M. Savitskii ◽  
V.F. Terekhova ◽  
O.P. Naumkin
Keyword(s):  
Rare Earth ◽  
Rare Earth Metals ◽  
Chemical Properties ◽  
Physico Chemical ◽  
The Rare Earth
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