scholarly journals Physico-chemical Properties and Performance of High Oleic and Palm-Based Shortenings

2008 ◽  
Vol 57 (11) ◽  
pp. 605-612 ◽  
Author(s):  
Muhamad Roddy Ramli ◽  
Siew Wai Lin ◽  
Cheah Kien Yoo ◽  
Nor Aini Idris ◽  
Miskandar Mat Sahri
Keyword(s):  
Chemical Properties ◽  
High Oleic ◽  
Physico Chemical ◽  
And Performance

scholarly journals Bis(trifluoromethylsulfonyl)imide Ionic Liquids Applied for Fine-Tuning the Cure Characteristics and Performance of Natural Rubber Composites

2021 ◽  
Vol 22 (7) ◽  
pp. 3678
Author(s):  
Anna Sowińska ◽  
Magdalena Maciejewska ◽  
Anna Grajewska
Keyword(s):  
Ionic Liquids ◽  
Natural Rubber ◽  
Crosslink Density ◽  
Chemical Properties ◽  
Fine Tuning ◽  
Crosslinking Degree ◽  
Cure Characteristics ◽  
Physico Chemical ◽  
Elastomer Composites ◽  
And Performance

The goal of this work was to apply ionic liquids (ILs) with bis(trifluoromethylsulfonyl)imide anion (TFSI) for fine-tuning the cure characteristics and physico-chemical properties of elastomer composites based on a biodegradable natural rubber (NR) matrix. ILs with TFSI anion and different cations, such as alkylpyrrolidinium, alkylammonium, and alkylsulfonium cations, were applied to increase the efficiency of sulfur vulcanization and to improve the performance of NR composites. Thus, the influence of ILs on the vulcanization of NR compounds, as well as crosslink density and physical properties of NR vulcanizates, including tensile properties, thermal stability, and resistance to thermo-oxidative aging was explored. The activity of ILs seems to be strongly dependent on their cation. Pyrrolidinium and ammonium ILs effectively supported the vulcanization, reducing the optimal vulcanization time and temperature of NR compounds and increasing the crosslink density of the vulcanizates. Consequently, vulcanizates with these ILs exhibited higher tensile strength than the benchmark without IL. On the other hand, sulfonium ILs reduced the torque increment owing to the lower crosslinking degree of elastomer but significantly improved the resistance of NR composites to thermo-oxidation. Thus, TFSI ILs can be used to align the curing behavior and performance of NR composites for particular applications.

Synthesis of nanosized mixed metal oxides heat and corrosion resistant pigments: CaMnO3, Ca2Cr2O5 and CaSb2O6

2015 ◽  
Vol 44 (6) ◽  
pp. 379-385 ◽  
Author(s):  
Osama A. G. Wahba ◽  
Ali M. Hassan ◽  
H. Abd El-wahab ◽  
A. Mohy-Eldin ◽  
A.M. Naser ◽  
...  
Keyword(s):  
Low Cost ◽  
Chemical Properties ◽  
Mixed Metal Oxide ◽  
Corrosion Resistant ◽  
Content Type ◽  
Mixed Metal ◽  
Nanosized Materials ◽  
Physico Chemical ◽  
And Performance ◽  
Co Precipitation

Purpose – The purpose of this paper is to investigate the synthesis of calcium-based group of mixed metal oxide (MMO) pigments. The evaluation of these pigments as heat and corrosion resistant was also explored. Design/methodology/approach – Two simple synthesis techniques, namely, co-precipitation and solid-state calcination method, were used to synthesise nanosized MMO pigments. And then the physico-chemical requirements according to standards for the synthesised pigments are investigated. Findings – The prepared MMO pigments were mainly in the single phase double oxide forms. The prepared oxides exhibited good heat (up to 600°C) and corrosion resistance properties (in 5 per cent NaCl for 500 h). Research limitations/implications – This paper investigates the physico-chemical properties of synthesised calcium-based group of MMO pigments. And then evaluate it as heat and corrosion resistant paints. The simple techniques used for synthesis of nanosized MMO pigments will significantly improve the research and development of pigments’ structure and performance. Practical implications – Calcium-based MMO pigments can be used as heat and corrosion resistant pigments. The easy synthesis of the mixed oxide pigments will open the door for further vital special industrial uses and applications. Originality/value – Low cost, simple techniques and using naturally abundant material can be used for mass production of some other low-cost nanosized materials.

scholarly journals Applying additivity rule to determine physico-chemical properties of edible oil blends based on known parameters of component oils

2021 ◽  
Vol 126 (1) ◽  
pp. 133-149
Author(s):  
Lucyna Dymińska ◽  
Abduladhim Moamer Albegar ◽  
Adam Zając ◽  
Tadeusz Czuj ◽  
Wojciech Sąsiadek ◽  
...  
Keyword(s):  
Chemical Properties ◽  
Deep Frying ◽  
Chemical Parameters ◽  
Plant Oil ◽  
Oil Blends ◽  
Physico Chemical ◽  
Expected Performance ◽  
Input Dataset ◽  
And Performance ◽  
Oil Blend

In the paper, a procedure was suggested for making plant oil blends of desirable physico-chemical and performance parameters. There was applied a rule of additivity of parameters of component oils in the blend to get oil products with modified nutritional characteristics. The other objective of the research study was to test the usefulness of the procedure when projecting thermal properties of the blends for deep frying. To make oil blends, plant oils were used that were produced by Oleofarm Ltd. The oil blends were analysed using chromatographic and spectroscopic methods. Their chemical parameters constituted an input dataset to make blends of expected performance properties. It was shown experimentally that it was possible to theoretically project physico-chemical and thermal parameters of the final oil blend. When knowing the chemical parameters of individual blend-forming oils, it is possible to employ them to determine the parameters of the final blend. There were suggested oil compositions for the preparation of advantageous blends to be used for deep frying and salad dressings. Thus there was confirmed the purposefulness of blending the oils in order to make a product the qualities of which could be geared to the specific utility purposes.

Nanoscale DNA Sensing-Potential and Prospects

2014 ◽  
Vol 925 ◽  
pp. 486-489
Author(s):  
Md Eaqub Ali ◽  
Md. Mahfujur Rahman ◽  
Sharifah Bee Abd Hamid ◽  
Uda Hashim
Keyword(s):  
Chemical Properties ◽  
Multiplex Detection ◽  
Dna Sensing ◽  
Size Dependent ◽  
Dna Molecule ◽  
Physico Chemical ◽  
Atomic Precision ◽  
Nanoscale Structure ◽  
And Performance ◽  
Significant Attention

Nanomaterials have attractive physico-chemical properties to create building block for special reorganization of DNA molecule. Nanomaterial based DNA sensors can be constructed with atomic precision, enhancing sensitivity and performance. Gold nanoparticles have excellent properties for tailoring size and shape to architect nanoscale structure, enhancing sensing and detection capacity by several magnitudes. Carbon nanotubes can immobilize probe DNA molecule and amplify signal transduction. Silica-nanoparticles based DNA detection inward significant attention because of their small size and ultra-scale sensitivity. Quantum dots have size-dependent adaptable photoluminescence with capability to perform multiplex detection. This paper has reviewed potential nanomaterials for DNA sensing application.

Physico-Chemical Properties and Performance of Novel PEEK-WC Membranes Contacting Human Plasma and Proteins

2005 ◽  
Vol 480-481 ◽  
pp. 257-268 ◽  
Author(s):  
L. De Bartolo ◽  
A. Gugliuzza ◽  
S. Morelli ◽  
B. Cirillo ◽  
A. Gordano ◽  
...  
Keyword(s):  
Human Plasma ◽  
Chemical Properties ◽  
Protein Solutions ◽  
Cellulose Acetate Membrane ◽  
Scanning Calorimetry ◽  
Water Contact ◽  
Membrane Surfaces ◽  
Low Protein ◽  
Physico Chemical ◽  
And Performance

The aim of this work was the exploration of a potential biocompatible membrane prepared from a modified polyetheretherketone (PEEK-WC). The physico-chemical properties of PEEK-WC were characterised by Differential Scanning Calorimetry and FT-Infrared Spectroscopy. The surface affinity of this membrane to human plasma and proteins such as albumin, fibrinogen and immunoglobulins G was evaluated and compared with that of commercial membranes. The wettability of all investigated membranes was established by water contact angle measurements. PEEK-WC membranes exhibited moderate wettability and low protein adsorption, differently from other commercial membranes such as cellulose acetate membrane. A preferential adsorption of hydrophilic proteins as albumin on the membrane surfaces was observed. Human plasma adsorption on membranes followed the same trend as individual protein solutions.

scholarly journals Influence of Drug Incorporation on the Physico-Chemical Properties of Poly(l-Lactide) Implant Coating Matrices—A Systematic Study

Polymers ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 292
Author(s):  
Daniela Arbeiter ◽  
Thomas Reske ◽  
Michael Teske ◽  
Dalibor Bajer ◽  
Volkmar Senz ◽  
...  
Keyword(s):  
Cyclosporine A ◽  
Chemical Properties ◽  
Tensile Tests ◽  
Local Drug Delivery ◽  
Physico Chemical ◽  
Thermal Measurements ◽  
Implant Coating ◽  
Life Threatening ◽  
And Performance ◽  
Drug Incorporation

Local drug delivery has become indispensable in biomedical engineering with stents being ideal carrier platforms. While local drug release is superior to systemic administration in many fields, the incorporation of drugs into polymers may influence the physico-chemical properties of said matrix. This is of particular relevance as minimally invasive implantation is frequently accompanied by mechanical stresses on the implant and coating. Thus, drug incorporation into polymers may result in a susceptibility to potentially life-threatening implant failure. We investigated spray-coated poly-l-lactide (PLLA)/drug blends using thermal measurements (DSC) and tensile tests to determine the influence of selected drugs, namely sirolimus, paclitaxel, dexamethasone, and cyclosporine A, on the physico-chemical properties of the polymer. For all drugs and PLLA/drug ratios, an increase in tensile strength was observed. As for sirolimus and dexamethasone, PLLA/drug mixed phase systems were identified by shifted drug melting peaks at 200 °C and 240 °C, respectively, whereas paclitaxel and dexamethasone led to cold crystallization. Cyclosporine A did not affect matrix thermal properties. Altogether, our data provide a contribution towards an understanding of the complex interaction between PLLA and different drugs. Our results hold implications regarding the necessity of target-oriented thermal treatment to ensure the shelf life and performance of stent coatings.

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.

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