Mixtures Of Bromoform Research Articles

Structural and optical properties of brominated plasma polymers

Novel brominated amorphous hydrogenated carbon (a-C:H:Br) films were produced by the plasma polymerization of acetylene–bromoform mixtures. The main parameter of interest was the degree of bromination, which depends on the partial pressure of bromoform in the plasma feed, expressed as a percentage of the total pressure, RB. When bromoform is present in the feed, deposition rates of up to about 110nmmin−1 may be obtained. The structure and composition of the films were characterized by Transmission Infrared Reflection Absorption Spectroscopy (IRRAS) and X-ray Photo-electron Spectroscopy (XPS). The latter revealed that films with atomic ratios Br:C of up to 0.58 may be produced. Surface contact angles, measured using goniometry, could be increased from ~63° (for an unbrominated film) to ~90° for RB of 60 to 80%. Film surface roughness, measured using a profilometer, does not depend strongly on RB. Optical properties — the refractive index, n, absorption coefficient, α(E), where E is the photon energy, and the optical gap, Eg, were determined from film thicknesses and data obtained by Transmission Ultraviolet–Visible Near Infrared Spectroscopy (UVS). Control of n was possible via selection of RB. The measured optical gap increases with increasing FBC, the atomic ratio of Br to C in the film, and semi-empirical modeling accounts for this tendency. A typical hardness of the brominated films, determined via nano-indentation, was ~0.5GPa.

A study on mixing properties of binary mixtures of bromoform with aliphatic alcohols

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA study on mixing properties of binary mixtures of bromoform with aliphatic alcoholsTejraj M. Aminabhavi and Shrinivas K. RaikarCite this: J. Chem. Eng. Data 1993, 38, 2, 310–319Publication Date (Print):April 1, 1993Publication History Published online1 May 2002Published inissue 1 April 1993https://doi.org/10.1021/je00010a033RIGHTS & PERMISSIONSArticle Views107Altmetric-Citations39LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (834 KB) Get e-Alerts Get e-Alerts

Thermodynamic interactions in mixtures of bromoform with hydrocarbons

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermodynamic interactions in mixtures of bromoform with hydrocarbonsMrityunjaya I. Aralaguppi, Tejraj M. Aminabhavi, Ramachandra H. Balundgi, and Shrikant S. JoshiCite this: J. Phys. Chem. 1991, 95, 13, 5299–5308Publication Date (Print):June 1, 1991Publication History Published online1 May 2002Published inissue 1 June 1991https://doi.org/10.1021/j100166a070RIGHTS & PERMISSIONSArticle Views295Altmetric-Citations181LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (1 MB) Supporting Info (1)»Supporting Information Supporting Information Get e-Alerts

Thermochemical investigations of associated solutions. 10. Excess enthalpies and excess volumes of ternary acetone + bromoform + n-hexane mixtures

Excess molar volumes and excess enthalpies are reported for binary acetone + n-hexane, bromoform + n-hexane and acetone + bromoform mixtures, and for the ternary acetone + bromofonn + n-hexane system at 308.15 K.. Results of these measurements are used to test the applications and limitations of a newly derived conventional non-electrolyte associated solution model. The general model assumes that the Gibbs free energy, excess volume and excess enthalpy can be separated into a chemical and physical contribution. The chemical interaction term results from the formation of molecular complexes and the physical contribution describes non-specific interactions between the uncomplexed and associated species in solution. Six binary interaction parameters are initially needed to describe all the binary non-specific interactions present. Simplifying approximations and mathematical manipulations reduces the number of binary interaction parameters to only three values.

A study on excess functions and thermodynamic parameters of some bromoform- containing binary mixtures

Densities and viscosities have been determined for six binary mixtures of bromoform, aniline, n-hexane, benzonitrile, butyronitrile, and benzylnitrile at different mole fractions and temperatures. The excess volumes VE, apparent excess values of viscosity δη, excess Gibbs energy of activation of flow ΔG*E, and partial molar volumes Vi have been calculated from the experimental data. Furthermore, attempts were made to calculate theoretically the excess isobaric thermal expansion coefficient δα, of the mixtures using the refractive index mixture rules. These results are in good agreement with the experimental data obtained from densities. Various excess functions and thermodynamic parameters have been used in the discussion of results to understand the nature and type of interactions in binary mixtures. Keywords: excess volume, refractive index mixture rules, interactions, bromoform, density, viscosity.

Thermodynamic investigation of molecular complexation in binary acetone + bromoform mixture

Molar excess volumes, VE, and molar excess enthalpies, HE, have been measured for acetone (A) + bromoform (B) mixtures at 298.15 and 308.15 K. Results of these measurements suggest the formation of a 1:1 acetone–bromoform molecular complex. The equilibrium constant, K, the enthalpy of formation, ΔH, of the AB complex as also the molar volume change, ΔV, accompanying the complexation reaction [Formula: see text] have been evaluated from the measured HE and VE data. The K value so obtained has further been substantiated by the K value determined for the AB molecular entity from nmr studies on this mixture. Partial molar enthalpy of B (at infinite dilution) in A and vice versa have also been evaluated from the measured HE data at 298.15 K and used to calculate a consistent molar enthalpy of AB complex formation.

Excess volumes of chloroform and bromoform mixtures with some n-alcohols at 303.15 K

Excess volumes of binary mixtures of chloroform and bromoform with the following n-alcohols: methanol, ethanol, and n-propanol have been measured as a function of composition at 303.15 K by a dilatometric method.

Thermodynamics of weak interactions: Excess enthalpies of some binary bromoform mixtures

Excess enthalpies of bromoform + toluene, + o-xylene + m-xylene and + p-xylene have been determined at 308.15 K. These compounds have been examined for Barker's theory in order to understand the magnitude and nature of various interactions between the components of these mixtures. It has been concluded that the H-atom and one bromine atom of bromoform interact with the π cloud of the aromatic ring. These conclusions have been supplemented by n.m.r. studies. An approximate distance of the bromoform proton from the plane of the aromatic ring has also been calculated and examined in the light of the proposed geometry of the molecular complexes. Equilibrium constants for the complexations reaction have also been determined.

Kinetic Analysis of Hot Bromine Atom Reactions in Liquids

Summary The yield of organically bound radio-bromine was determined in a wide range of mixtures of benzene, hexane, cyclohexane, tetradecane and bromoform with molecular bromine. The data was analysed by applying the kinetic theory of hot reactions to these liquid systems. After a number of drastic assumptions it was found possible to express the data in terms of two parameters: a) the reactivity integral (/) and b) the collisional energy loss (α). The validity of the independently obtained parameters (α and I)was checked by the determination - both experimentally and theoretically - of the organic yield of hot reactions in mixtures of bromoform and benzene. The values found for the α’s indicate that moderating collisions with hydrocarbon involve the whole molecule, whereas with halocarbons the collisions have more of an atom-atom character.

Density of Neutron-Irradiated Lithium Fluoride Crystals

The density of lithium fluoride crystals irradinted in the 1O/sup 18/ range in BRl was measured by flotation of the samples in suitable mixtures of bromoform, hexanol, and pentanol. By comparison with standard floats of fused silica, an accuracy of 0.001% was readily attalned. A U-shaped fiotation chamber was used, one tube con taining the crystals and the other the standard float. (W.D.M.)