Synthesis, characterization, and miscibility of caprolactone random copolymers
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Materials Literature
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Layering transitions in colloidal crystals as observed by diffraction and direct-lattice imaging
Layering transitions of colloidal crystals confined between two smooth glass surfaces have been studied by transmission diffraction of light as well as direct-lattice imaging with an optical microscope. The polystyrene spheres we studied have diameter \ensuremath{\Phi}=0.305 \ensuremath{\mu}m and a surface charge of \…
Ultrasonic investigation of the glass transition in glycerol
We have measured, as a function of temperature and frequency, the velocity and attenuation of ultrasound near the glass transition of glycerol. The data are compared with that from frequency-dependent specific-heat measurements recently performed on the same sample. When the difference between adiabatic and isothermal…
Significance of Internal Stresses for the Martensitic Transformation in Yttria‐Stabilized Tetragonal Zirconia Polycrystals During Degradation
Various aspects of the tetragonal ( t ) to monoclinic ( m ) transformation during degradation have been studied experimentally and theoretically in yttria‐stabilized tetragonal zirconia polycrystals (Y‐TZP), i.e., polycrystalline t ‐ZrO 2 containing Y 2 O 3 in solution. Transmission electron microscopy (TEM) revealed…
Photoelectric Properties of Copper Phthalocyanine Langmuir-Blodgett Film
Photovoltaic and structural characteristics of Langmuir-Blodgett film photocells have been studied using asymmetrically substituted copper phthalocyanine (asy-CuPc). By polarized-light absorbance measurements, each phthalocyanine molecule was found to be arranged in the film with its ring facing towards the dipping di…
Plenary Lecture—1986: Effects of Alloy Composition and Microstructure on the Passivity of Stainless Steels
The passive region of stainless steels (SSs), as defined by the low current regime between the active-passive transition and the pitting potential or the transpassive potential, is discussed in terms of solid solution alloying and microstructure. In considering the beneficial effects of solid solution alloying, emphas…
The recent developments of thermotropic liquid crystalline polymers
Abstract The historical development of both main‐chain (M.C.) and side‐chain (S.C.) liquid crystalline polymers (LCPs) is presented. Synthetic routes and characterization techniques for LCPs are introduced. Various approaches to reduce the melting points of M.C. LCPs and to increase the mesogenic order of S.C. LCPs ar…
Crystallography of quasi-crystals
The symmetry of quasi-crystals, a class of materials that has recently aroused interest, is discussed. It is shown that a quasi-crystal is a special case of an incommensurate crystal phase and that it can be described by a space group in more than three dimensions. A number of relevant three-dimensional quasi-crystals…
Preparation of c-axis oriented PbTiO3 thin films and their crystallographic, dielectric, and pyroelectric properties
Highly c-axis oriented and epitaxial PbTiO3 thin films were grown on MgO single crystals and epitaxial Pt film substrates by the rf-magnetron sputtering method. The films with a 98% c-axis orientation rate were obtained under low deposition rate (<20 Å/min) and low gas pressure (∼1 Pa) using a PbO-rich target.…
Electrochemical Properties of Electropolymerized Poly(1-pyrenamine) Films
Abstract The electropolymerization of 1-pyrenamine (PA) in an acetonitrile solution led to the polymeric film formation on electrode surfaces. The chemical, spectroscopic, electrical and electrochemical characterization of the resulting poly(1-pyrenamine) (PPA) films was carried out. The number-average molecular weigh…
Osmotic pressure of foams and highly concentrated emulsions. I. Theoretical considerations
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOsmotic pressure of foams and highly concentrated emulsions. I. Theoretical considerationsH. M. PrincenCite this: Langmuir 1986, 2, 4, 519–524Publication Date (Print):July 1, 1986Publication History Published online1 May 2002Published inissue 1 July 1986https://pubs.acs.org/…
Theoretical calculations of semiconductor heterojunction discontinuities
We have performed self-consistent density functional calculations on semiconductor heterojunctions, using ab initio nonlocal pseudopotentials, and have derived valence band discontinuities for many different interfaces between both lattice-matched and strained epitaxial layers. The agreement with reported experimental…
Chromatographic analysis of the chiral and covalent instability of S-adenosyl-L-methionine
The chirality of biologically active S-adenosyl-L-methionine (AdoMet) is S,S, where the designations refer to the sulfur and the alpha-carbon, respectively. This paper describes a cation-exchange high-performance liquid chromatographic (HPLC) method for separating (S,S)-AdoMet from the biologically inactive (R,S)-AdoM…
Bound Rubber and Carbon Black Reinforcement
Abstract The first description of the bound rubber phenomenon was by Twiss in 1925, who made the observation that the resistance of carbon black-natural rubber mixes to solvents was related to improved mechanical properties. Boiry studied many of the factors influencing the insolubilization of NR by fillers including…
Strength Limitations of Transformation‐Toughened Zirconia Alloys
Two mechanisms are proposed for the limitation of strength in transformation‐toughened zirconia ceramics: that the strength is limited by the critical stress to induce the tetragonal‐to‐monoclinic zirconia phase transformation and that the inherent R ‐curve behavior of these materials limits the strength. Experimental…
The molecular origin of lamellar branching in the α (monoclinic) form of isotactic polypropylene
Abstract The specific lamellar branching characteristic of isotactic polypropylene (iPP) in its α monoclinic modification, first investigated in detail by Khoury, is analyzed in molecular terms on the basis of the geometrical and structural models of Padden and Keith and of Binsbergen and de Lange, respectively. As su…
The dynamics of the spreading of liquids on a solid surface. Part 2. Surfactants
A theoretical study is made of the effect of the presence of a surfactant on the dynamics involved in the movement of the contact line when one liquid displaces an immiscible second liquid where both are in contact with a smooth solid surface. The general procedure of solution is described for a general model for slip…
The influence of substratum surface free energy on growth and spreading of human fibroblasts in the presence and absence of serum proteins
To determine whether the surface free energy of polymer materials influences the spreading of 13 polymers and glass were related to spreading and growth of human skin fibroblasts. Experiments were performed in both the presence and absence of serum proteins. We calculated the surface free energy from contact angles of…
Electrical Conduction in Carbon Black Composites
Abstract Electrical conductivity is important in many rubber and plastic compounds including antistatic applications, wire and cable sheathing, and shielding against electromagnetic interference (EMI). Elastomers and plastics are insulators (dielectrics) to which conductivity is imparted by addition of a finely divide…
Thermodynamic Properties of Iron and Silicon
This work reviews and discusses the data on the various thermodynamic properties of iron and silicon available through March 1984. These include heat capacity, enthalpy, enthalpies of transition and melting, vapor pressure, and enthalpy of vaporization. The recommended values for heat capacity, enthalpy, entropy, and…