Calcium Nitrate Tetrahydrate

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K. Ismail - One of the best experts on this subject based on the ideXlab platform.

  • Acidity function of Calcium Nitrate Tetrahydrate melt
    Indian journal of chemistry. Sect. A: Inorganic physical theoretical & analytical, 2003
    Co-Authors: S. Dev, B. Sunar, S. S. Islam, K. Ismail
    Abstract:

    Visible spectra of methyl red, methyl orange, p-nitrophenol , p-nitroaniline , and bromophenol blue in Calcium Nitrate Tetrahydrate melt have been recorded at 25°C. All the indicators react with the acidic Calcium Nitrate Tetrahydrate melt. It is found that indicators having high pKa value in the range ~ 4 can be used as probes if the spectra of acidic and basic forms of such indicators in the hydrate melt are well separated. Acidity function of Calcium Nitrate Tetrahydrate melt has been determined from the spectral data of p-nitroaniline and bromophenol blue only and its values, 1.8 and 2.6 respectively are estimated from their respecti ve spectra. Room-temperature molten salts are now emerging as potential solvents for synthetic work '. Hydrate melts are one kind of room-temperature ionic liquids 2 , which possess remarkable chemical properties. Due to the presence of aquometal complexes hydrate melts and highly concentrated aqueous solutions of certain metal salts have high acidic behaviour3.(" which can be controlled by the addition of a second salt4. The acidic behaviour of hydrate melts is attributed to the equilibrium of the type

  • electrical conductance of sodium dodecyl sulfate in Calcium Nitrate Tetrahydrate acetamide melts
    Journal of Chemical & Engineering Data, 2001
    Co-Authors: Dev S And, K. Ismail
    Abstract:

    The specific conductance of sodium dodecyl sulfate (SDS) in molten mixtures of Calcium Nitrate Tetrahydrate (CNTH) and acetamide was measured at 38 °C. In these molten mixtures SDS undergoes micellization and the values of the critical micelle concentration (cmc) were estimated. The shape of the specific conductance versus concentration of SDS isotherm depends on the relative amounts of the hydrated salt and acetamide present in the molten mixture. The slope of this isotherm is positive in the acetamide-rich (>∼73 mass % acetamide) melt, and it changes to a negative value in the hydrated salt-rich melt.

  • Density and Electrical Conductance of Calcium Nitrate Tetrahydrate + Acetamide Melt
    Journal of Chemical & Engineering Data, 1995
    Co-Authors: S. K. Chettri, S. Dev, K. Ismail
    Abstract:

    Density and electrical conductance of the Calcium Nitrate Tetrahydrate+acetamide melt were measured as functions of temperature and mole fraction of acetamide. On the basis of the additivity of molar volume, an alternative method has been suggested for estimating the densities of high- or low-melting anhydrous inorganic and organic salts using a suitable hydrate melt as solvent. Molar conductance data were analyzed by using the Vogel-Tammann-Fulcher equation. At ambient temperature the specific conductance of molten Calcium Nitrate Tetrahydrate decreases by the addition of acetamide as was the case with the addition of KNO 3 −

  • density and electrical conductance of Calcium Nitrate Tetrahydrate acetamide melt
    Journal of Chemical & Engineering Data, 1995
    Co-Authors: S. K. Chettri, S. Dev, K. Ismail
    Abstract:

    Density and electrical conductance of the Calcium Nitrate Tetrahydrate+acetamide melt were measured as functions of temperature and mole fraction of acetamide. On the basis of the additivity of molar volume, an alternative method has been suggested for estimating the densities of high- or low-melting anhydrous inorganic and organic salts using a suitable hydrate melt as solvent. Molar conductance data were analyzed by using the Vogel-Tammann-Fulcher equation. At ambient temperature the specific conductance of molten Calcium Nitrate Tetrahydrate decreases by the addition of acetamide as was the case with the addition of KNO 3 −

Michelina Catauro - One of the best experts on this subject based on the ideXlab platform.

  • Sol-gel synthesis, structure and bioactivity of polycaprolactone/CaO . SiO2 hybrid material.
    Journal of Materials Science: Materials in Medicine, 2004
    Co-Authors: Michelina Catauro, Antonio Marotta, Aline Buri, Francesco De Gaetano, Maria Grazia Raucci, Lucio D'ambrosio
    Abstract:

    A method has been developed to cast novel organic/inorganic polymer hybrids from multicomponent solutions containing tetramethyl orthosilicate, Calcium Nitrate Tetrahydrate, polycaprolactone, water, and methylethyketone via sol–gel process. The existence of the hydrogen bonds between organic and inorganic components of the hybrid and hydroxyapatite formation on the surface was proved by Fourier transform infrared analysis. The morphology of the hybrid material was studied by scanning electron microscopy. The structure of a molecular level dispersion was disclosed by atomic force microscopy, pore size distribution, and surface measurements. The infrared spectra of the hybrid relative to sample soaked in a fluid simulating the composition of human blood plasma suggests that polycaprolactone/CaO • SiO2 hybrid material synthesised via sol–gel process is bioactive as well as the CaO • SiO2 gel glass.

  • Antibacterial and bioactive silver-containing Na2O·CaO·2SiO2 glass prepared by sol–gel method
    Journal of materials science. Materials in medicine, 2004
    Co-Authors: Michelina Catauro, Maria Grazia Raucci, F. De Gaetano, A. Marotta
    Abstract:

    The antibacterial effect of addition of silver oxide to Na2O x CaO x 2SiO2 glass have been studied. Silver containing and silver free Na2O x CaO x 2SiO2 glasses have been prepared by sol-gel synthesis using tetramethil orthosilicate, sodium ethoxide, Calcium Nitrate Tetrahydrate and silver Nitrate as starting materials and methyl ethyl ketone as solvent. The gel was examined by differential thermal analysis, thermo gravimetric analysis, FTIR spectroscopy and X-ray diffraction analysis. Antibacterial and bioactive tests on gel glass powders, obtained after a heat treatment of 2 h at 600 degrees C of the dried gel, were carried out. High antimicrobial effects of samples against Escherichia coli and Streptococcus mutans were found. FTIR measurements and SEM micrographs have ascertained the formation of a hydroxyapatite layer on the surface of samples soaked in a simulated body fluid for different times.

  • Low temperature synthesis, structure and bioactivity of xCaO.(1-x)SiO2 glasses
    Journal of thermal analysis, 1997
    Co-Authors: Aline Buri, Michelina Catauro, Aniello Costantini, G. Laudisio, R. Fresa, Francesco Branda
    Abstract:

    Glasses of composition expressed by the following general formula xCaO(1-x)SiO2 (0.30 less than or equal to x less than or equal to 0.50) can be prepared by means of the sol-gel route starting from tetramethylorthosilicate and Calcium Nitrate Tetrahydrate They are all difficult to prepare by means of the traditional technique of quenching the melt, because of the high liquidus temperature, T-1, that in the case of x=0.3 glass is T-1=1650 degrees C. The DTA apparatus appears a valuable tool for defining the procedure necessary to obtain the glass through the sol-gel route. The glass x=0.3 is bioactive. The experimental results suggest that the gel structures, such as obtained at room temperature, are very similar; only at high temperature do the reactions of hydrolysis and polycondensation go to completion and the structural units characteristic of each glass are obtained

S. K. Chettri - One of the best experts on this subject based on the ideXlab platform.

  • Density and Electrical Conductance of Calcium Nitrate Tetrahydrate + Acetamide Melt
    Journal of Chemical & Engineering Data, 1995
    Co-Authors: S. K. Chettri, S. Dev, K. Ismail
    Abstract:

    Density and electrical conductance of the Calcium Nitrate Tetrahydrate+acetamide melt were measured as functions of temperature and mole fraction of acetamide. On the basis of the additivity of molar volume, an alternative method has been suggested for estimating the densities of high- or low-melting anhydrous inorganic and organic salts using a suitable hydrate melt as solvent. Molar conductance data were analyzed by using the Vogel-Tammann-Fulcher equation. At ambient temperature the specific conductance of molten Calcium Nitrate Tetrahydrate decreases by the addition of acetamide as was the case with the addition of KNO 3 −

  • density and electrical conductance of Calcium Nitrate Tetrahydrate acetamide melt
    Journal of Chemical & Engineering Data, 1995
    Co-Authors: S. K. Chettri, S. Dev, K. Ismail
    Abstract:

    Density and electrical conductance of the Calcium Nitrate Tetrahydrate+acetamide melt were measured as functions of temperature and mole fraction of acetamide. On the basis of the additivity of molar volume, an alternative method has been suggested for estimating the densities of high- or low-melting anhydrous inorganic and organic salts using a suitable hydrate melt as solvent. Molar conductance data were analyzed by using the Vogel-Tammann-Fulcher equation. At ambient temperature the specific conductance of molten Calcium Nitrate Tetrahydrate decreases by the addition of acetamide as was the case with the addition of KNO 3 −

Iskender Yilgor - One of the best experts on this subject based on the ideXlab platform.

S. Dev - One of the best experts on this subject based on the ideXlab platform.

  • Acidity function of Calcium Nitrate Tetrahydrate melt
    Indian journal of chemistry. Sect. A: Inorganic physical theoretical & analytical, 2003
    Co-Authors: S. Dev, B. Sunar, S. S. Islam, K. Ismail
    Abstract:

    Visible spectra of methyl red, methyl orange, p-nitrophenol , p-nitroaniline , and bromophenol blue in Calcium Nitrate Tetrahydrate melt have been recorded at 25°C. All the indicators react with the acidic Calcium Nitrate Tetrahydrate melt. It is found that indicators having high pKa value in the range ~ 4 can be used as probes if the spectra of acidic and basic forms of such indicators in the hydrate melt are well separated. Acidity function of Calcium Nitrate Tetrahydrate melt has been determined from the spectral data of p-nitroaniline and bromophenol blue only and its values, 1.8 and 2.6 respectively are estimated from their respecti ve spectra. Room-temperature molten salts are now emerging as potential solvents for synthetic work '. Hydrate melts are one kind of room-temperature ionic liquids 2 , which possess remarkable chemical properties. Due to the presence of aquometal complexes hydrate melts and highly concentrated aqueous solutions of certain metal salts have high acidic behaviour3.(" which can be controlled by the addition of a second salt4. The acidic behaviour of hydrate melts is attributed to the equilibrium of the type

  • Density and Electrical Conductance of Calcium Nitrate Tetrahydrate + Acetamide Melt
    Journal of Chemical & Engineering Data, 1995
    Co-Authors: S. K. Chettri, S. Dev, K. Ismail
    Abstract:

    Density and electrical conductance of the Calcium Nitrate Tetrahydrate+acetamide melt were measured as functions of temperature and mole fraction of acetamide. On the basis of the additivity of molar volume, an alternative method has been suggested for estimating the densities of high- or low-melting anhydrous inorganic and organic salts using a suitable hydrate melt as solvent. Molar conductance data were analyzed by using the Vogel-Tammann-Fulcher equation. At ambient temperature the specific conductance of molten Calcium Nitrate Tetrahydrate decreases by the addition of acetamide as was the case with the addition of KNO 3 −

  • density and electrical conductance of Calcium Nitrate Tetrahydrate acetamide melt
    Journal of Chemical & Engineering Data, 1995
    Co-Authors: S. K. Chettri, S. Dev, K. Ismail
    Abstract:

    Density and electrical conductance of the Calcium Nitrate Tetrahydrate+acetamide melt were measured as functions of temperature and mole fraction of acetamide. On the basis of the additivity of molar volume, an alternative method has been suggested for estimating the densities of high- or low-melting anhydrous inorganic and organic salts using a suitable hydrate melt as solvent. Molar conductance data were analyzed by using the Vogel-Tammann-Fulcher equation. At ambient temperature the specific conductance of molten Calcium Nitrate Tetrahydrate decreases by the addition of acetamide as was the case with the addition of KNO 3 −

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