scholarly journals Preparation of Poly (N-4-Antipyrinyl or Procainyl Methyl Nadamic Acids) as Drug Polymers

2014 ◽  
Vol 5 (1) ◽  
pp. 42-53
Author(s):  
Dr. Firyal M. Ali AL-Salami ◽  
Abbas N. M. AL-Sharify ◽  
Khudheyer Jawad Kadhem
Keyword(s):  
Room Temperature ◽  
Uv Spectroscopy ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Release Rates ◽  
Ph Values ◽  
Ft Ir ◽  
Physical And Chemical ◽  
And Chemical Properties ◽  
Ostwald Viscometer

Two new monomers of N-4-antipyrinyl methyl nadamic acid M1 and N-Procaienyl methyl nadamic acid M2 were synthesized from reaction of 4-Aminoantipyrine or procaine with methyl nadic anhydride at room temperature with dioxane as a solvent. The prepared monomers M1 and M2 were polymerized free radically with AIBN as initiator to corresponding polyamic acids P1 and P2, Which were converted to their sodium salt polymers P3 and P4 to enhanced their solubility's in water. The physical and chemical properties were studied for monomers and polymers, also FT-IR ,1H-NMR  and UV. Spectroscopy was characterized of M1or M2. The intrinsic viscosity was measured by  Ostwald viscometer at 30 0C  .The swelling %was measured and the controlled release rates of drug polymers were studied in different pH values at 37 0C.

Physical and Chemical Properties of Silicon Dioxide Film Deposited by New Process

1987 ◽  
Vol 105 ◽  
Author(s):  
Takuji Goda ◽  
Hirotsugu Nagayama ◽  
Akihiro Hishinuma ◽  
Hideo Kawahara
Keyword(s):  
Silicon Dioxide ◽  
Room Temperature ◽  
Etching Rate ◽  
Chemical Properties ◽  
Industrial Area ◽  
Physical And Chemical Properties ◽  
Silicon Dioxide Film ◽  
Wide Range ◽  
Physical And Chemical ◽  
And Chemical Properties

AbstractA new coating process of silicon dioxide (SiO2) “LPD” process, has been developed recently. Silicon dioxide (SiO2) film can be deposited on any substrate at the room temperature by immersing in hexafluorosilicic acid (H2SiF6).In this study, physical and chemical properties of the “LPD- SiO2” film were investigated by using XPS, IR, ellipsometry, and etch rate measurement. The properties of this film deposited at the room temperature were almost the same as those of plasma CVD. The “LPD-SiO2” film without annealing was contained traces of F and OH. However, by annealing, F and OH were rapidly evaporated from the film and the film was getting densified.As the “LPD-SiO2” film deposited at the room temperature showed very good results of chemical etching rate and of step coverage, it is expected that it is possible to use this “LPD- SiO2” film in the wide range of industrial area.

Extraction of Essential Oil from Sedap malam Flower (Polianthes tuberosa) Using Methanol Solvent

2021 ◽  
Vol 872 ◽  
pp. 67-71
Author(s):  
Suharno Rusdi ◽  
Farida Imtiyaz ◽  
Nopia Denvil Wulandari ◽  
Achmad Chafidz
Keyword(s):  
Essential Oil ◽  
Chemical Properties ◽  
Extraction Process ◽  
Physical And Chemical Properties ◽  
Simple Distillation ◽  
Infra Red ◽  
Ft Ir ◽  
Ir Analysis ◽  
Physical And Chemical ◽  
And Chemical Properties

The objectives of this study are to obtain essential oil from Sedap Malam (Tuberose) flower via extraction method and to characterize the physical and chemical properties of the essential oil produced, such as density, rendement, and chemical composition. The extraction process was carried out by using methanol solvent. The ratio between Sedap Malam flower and the methanol solvent was 1:5. After the extraction process of the essential oil finished, the essential oil and the solvent were separated via a simple distillation process. The collected essential oil was then characterized using Gas Chromatography-Mass Spectrophotometry (GC-MS) apparatus and Fourier Transform Infra-Red (FT-IR) analysis to investigate the content of the essential oil extracted from Sedap Malam flower. The physical characterization results showed that the essential oil has average rendement value of 12.605 % and density value of 1.0905 g/mL. Additionally, organoleptic test was carried to test the response of respondents toward the color and odor/fragrance of the essential oil extracted from Sedap Malam flower. Most of the responses were included in categories of “Like” and “Really like”. Additionally, for the fragrance, most of response of the respondents for all the four samples of essential oil were in category of “Really like”.

scholarly journals Influence of the Addition of Calcium Hydroxide Powder on Some Physical and Chemical Properties of the Sealer MTA Fillapex

2012 ◽  
Vol 3 (2) ◽  
pp. 180-183
Author(s):  
Marcelo Ferrarezi de Andrade ◽  
Renato de Toledo Leonardo ◽  
Edson Alves de Campos ◽  
Milton Carlos Kuga ◽  
Marco Antonio Hungaro Duarte ◽  
...  
Keyword(s):  
Calcium Hydroxide ◽  
Calcium Release ◽  
Ph Value ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Ph Values ◽  
The One ◽  
Physical And Chemical ◽  
The Impact ◽  
And Chemical Properties

ABSTRACT Objective This study evaluated the flow, pH and calcium release of MTA Fillapex (G1) or Fillapex plus 10% in weight of calcium hydroxide powder (G2), compared to AH Plus (G3) and Sealapex (G4). Materials and methods The flow test was performed according to ISO 6876:2001 requirements. The sealers were placed into plastic tubes and immersed in deionized water. After 24 hours, 7, 14 and 28 days, the water of each tube was removed and tested to evaluate the pH values and the level of released calcium. Calcium release values were analyzed statistically by Kruskal Wallis and Dunn tests and pH values analyzed by ANOVA and Tukey tests (α = 5%). Results G1 presented higher flow among all sealers. The addition of 10% calcium hydroxide into MTA Fillapex reduced the flow (p < 0.05) but, in a level, that is lower than the one recommended for ISO norms. G2 and G4 presented pH values and calcium release higher than G3 (p < 0.05) in all periods. G1 presented pH value higher than G3 (p < 0.05), except in 7 days period (p > 0.05). G4 presented higher pH values than G1 and G2, but the calcium release was similar for all periods (p > 0.05). G3 presented lower calcium release among all groups (p < 0.05). Conclusion The addition of 10% calcium hydroxide in MTA Fillapex caused reduction in flow and no negative interference in pH and/or calcium release. However, the obtained flow is different from ISO requirements. Clinical relevance MTA Fillapex presents levels of flow above the ISO norms. The addition of calcium hydroxide is a suggestion for solving this problem, but the impact of these procedures should be carefully evaluated. How to cite this article Keine KC, Guiotti FA, Leonardo RT, Kuga MC, Duarte MAH, de Campos EA, de Andrade MF. Influence of the Addition of Calcium Hydroxide Powder on Some Physical and Chemical Properties of the Sealer MTA Fillapex. World J Dent 2012;3(2):180-183.

scholarly journals Substratos no desenvolvimento de cultivares de gérbera envasada

2015 ◽  
Vol 21 (2) ◽  
pp. 177
Author(s):  
Fernanda Ludwig ◽  
Dirceu Maximino Fernandes ◽  
Amaralina Celoto Guerrero ◽  
Roberto Lyra Villas Bôas
Keyword(s):  
Dry Matter ◽  
Ornamental Plants ◽  
Chemical Properties ◽  
Dry Mass ◽  
Chemical Characteristics ◽  
Physical And Chemical Properties ◽  
Ph Values ◽  
Aerial Parts ◽  
Physical And Chemical ◽  
And Chemical Properties

The gerbera is a prominent culture that has gained in the Brazilian market of flowers and ornamental plants and there is a great demand for adequate substrates for its production. This study was conducted to evaluate the growth and distribution of dry mass and nitrogen in potted gerbera, depending on the substrates and cultivars. Experimental design was randomized blocks in a 5x2 factorial arrangement (5 substrates and 2 cultivars). Red and Cherry cultivars were evaluated at 1, 15, 29, 43 and 50 days of acclimation (DAA) to the leaves number, leaf area, dry mass of aerial parts (leaf and flower) and accumulation of nitrogen. From 29 DAA, the inflorescence has established as the drain and has contributed significantly to the total dry mass. The accumulation of nitrogen was similar in vegetative and reproductive periods. The traits evaluated varied depending on the substrate used, influenced by physical and chemical properties of the same. The growth, dry matter and nitrogen distribution potted gerbera cultivars Cherry and Red are influenced by physical and chemical characteristics of substrates, with better results in substrates with bulk density of less than 530 kg m-3 and pH values between 5.5 and 6.8

scholarly journals COMPARISON OF THE PHYSICAL AND CHEMICAL PROPERTIES BETWEEN CONTAINER-GROWN WOODY ORNAMENTALS

HortScience ◽  
1994 ◽  
Vol 29 (7) ◽  
pp. 730e-730
Author(s):  
April D. Edwards ◽  
Steven E. Newman ◽  
Adolph J. Laiche
Keyword(s):  
Pore Space ◽  
Chemical Properties ◽  
Hibiscus Cannabinus ◽  
Pine Bark ◽  
Physical And Chemical Properties ◽  
Woody Ornamentals ◽  
Fiber Core ◽  
Ph Values ◽  
Physical And Chemical ◽  
And Chemical Properties

Kenaf (Hibiscus cannabinus) is an alternative fiber crop being grown in Mississippi that maybe used as a tree-less fiber substitute for making paper. A by-product in this process is the pithy light-weight fiber core. The objective of this study was to examine the chemical and physical properties of kenaf fiber core as a medium component in growing woody ornamentals and compare to pine bark. Comparisons of media in which Ilex crenata `Cherokee' and Rhodoendron eirocarpum `Wakabuisi' were grown were made. The physical and chemical properties including bulk density, total pore space, water retention, pH and soluble salt concentrations were determined. Aged kenaf had lower pH values than fresh and both aged and fresh kenaf had higher pH values than pine bark. The total pore space of kenaf was lower than the pore space of pine bark. At the termination of the study, the kenaf media had considerable shrinkage, which was considered unsuitable for a long-term crop.

Synthesis of AC60-Para-Xylylene Copolymer

1992 ◽  
Vol 247 ◽  
Author(s):  
Douglas A. Loy ◽  
Roger A. Assink
Keyword(s):  
Free Radical ◽  
Room Temperature ◽  
Chemical Properties ◽  
Gravimetric Analysis ◽  
Physical And Chemical Properties ◽  
Thermal Gravimetric ◽  
Green Solution ◽  
Physical And Chemical ◽  
And Chemical Properties ◽  
Brown Powder

ABSTRACTThe preparation and purification of macroscopic quantities of buckminsterfullerenes [1] or buckyballs has ignited an explosion of research into their physical and chemical properties, and a variety of strategies for preparing new fullerene-based materials. Free radical synthesis is an appealing approach for forming polymeric fullerene materials. We report a polymeric fullerene material prepared by reacting pure C60 with xylylene from the thermolysis of paracyclophane. Addition of xylylene to a purple solution of C60 in toluene solution at -78 °C resulted in an olive-green solution from which an insoluble brown powder precipitated upon warming to room temperature. Analyses of the powder by solid state 13C MAS NMR, IR, and thermal gravimetric analysis are consistent with C60-xylylene copolymer.

An Instrument Established for the High Temperature Measurement of Ultraviolet-Visible Absorption Spectra of Molten Fluoride Salt Behaving As Coolant in the Molten Salt Reactor

2018 ◽  
Author(s):  
Hongtao Liu ◽  
Yiyang Liu ◽  
Tao Su
Keyword(s):  
High Temperature ◽  
Molten Salts ◽  
Room Temperature ◽  
Chemical Properties ◽  
Molten Salt Reactor ◽  
Physical And Chemical Properties ◽  
Molten Fluoride ◽  
Fluoride Salts ◽  
Physical And Chemical ◽  
And Chemical Properties

Molten salts were widely used in nuclear and solar power field due to the excellent heat transfer and storage. Molten fluoride salts were selected as primary and secondary coolants in the Molten Salt Reactor Experiment (MSRE) developed by Oak Ridge National Laboratory (ORNL). Therefore, it is dramatically important to study the physical and chemical properties of molten fluoride salts that impact on the design of reactor core and thermohydraulics. The molecular structure directly determines the physical and chemical properties of matter, so it is also essential to study the structure of molten salts. Spectroscopy has been proven to be a very useful tool for investigating molten salts structures. However, the standard instrument is inapplicable for measurement of the high temperature molten salts, especially for molten fluoride salts. To obtain the ultraviolet-visible (UV-Vis) absorption spectra of molten salts at high temperature, an instrument was designed to study the structures of molten salts in situ. The instrument is mainly composed of a vertical pit furnace connecting with a glovebox and an assembled cuvette which can operate from room temperature up to 800°C. The assembled cuvette is made of Hastelloy C/N as the main body with a reverse ‘T’ contour and diamond or crystalline CaF2 etc. as the window plates, so it can withstand the corrosion produced by the sample and allow the interest light passing through. The effective spectral range of this instrument is from 200 to 1000 nm. Performances of the instrument are testified by spectral studies on water under room temperature and molten salts under high temperature.

U(VI) Extraction by 8-hydroxyquinoline: a comparison study in ionic liquid and in dichloromethane

2017 ◽  
Vol 105 (6) ◽  
Author(s):  
Li-Yong Yuan ◽  
Xiang-Hong Liao ◽  
Zhi-Rong Liu ◽  
Zhi-Fang Chai ◽  
Wei-Qun Shi
Keyword(s):  
Room Temperature ◽  
Chemical Properties ◽  
Liquid Extraction ◽  
Physical And Chemical Properties ◽  
Comparison Study ◽  
New Class ◽  
Liquid Liquid Extraction ◽  
Physical And Chemical ◽  
Fuel Reprocessing ◽  
And Chemical Properties

AbstractRoom temperature ionic liquids (RTILs) represent a recent new class of solvents with potential application in liquid/liquid extraction based nuclear fuel reprocessing due to their unique physical and chemical properties. The work herein provides a comparison of U(VI) extraction by 8-hydroxyquinoline (HOX) in a commonly used RTIL, i.e. 1-butyl-3-methylimidazolium hexafluorophosphate ([C

Thermal Transport in the Copper Powders with Nanometer and Micrometer Particles

2010 ◽  
Vol 126-128 ◽  
pp. 952-956 ◽  
Author(s):  
Ching Yen Ho ◽  
Yu Hsiang Tsai ◽  
Feng Ming Sui
Keyword(s):  
Constant Temperature ◽  
Room Temperature ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Nanosized Particles ◽  
Bulk Materials ◽  
Processing Technologies ◽  
Copper Powders ◽  
Physical And Chemical ◽  
And Chemical Properties

This paper investigates effects of particle size on heat transfer in copper powders. The understanding for thermal properties of the powder is advantageous to the advancement of the processing technologies such as laser cladding, laser sintering, powder metallurgy and its other applications. Nanosized particles possess characteristic physical and chemical properties different from those of bulk materials due to the confinement of electrons, excitons, and photons into small volumes. Therefore it is valuable to discuss the thermal behaviours of powders constituted by nanometer-sized particles. The powder is wrapped up in the slender tube. One end of the slender tube filled with powder is connected to the low constant-temperature reservoir and the other end is kept at room temperature. The temperature histories at the 1cm location of the slender tube from the low constant-temperature reservoir are recorded using thermal couples. Powders of particles with the sizes 50nm and 5000nm are employed in this experiment. The results show that the thermal diffusion in the 50nm Cu powder is faster than that in the 5000nm Cu powder.

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