Materials Literature
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A device for the electrostatic transport and manipulation of liquid droplets on a solid surface is described. Arrays of microelectrodes are fabricated on a substrate, which is covered by a hydrophobic layer. Water droplets, typically a microliter in volume, take spherical shape on the surface and are caused to move by…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTCarbon Nanotube Tips: High-Resolution Probes for Imaging Biological SystemsStanislaus S. Wong, James D. Harper, Peter T. Lansbury,, and Charles M. LieberView Author Information Department of Chemistry and Chemical Biology Harvard University, 12 Oxford Street Cambridge,…
The structure of dispersed liquid crystal droplets elasticity, surface tension, and surface anchoring. For sufficiently large droplets with radius R K / W a, where K is the bulk elastic constant and W a is the anchoring coefficient, the surface terms prevail. As a result, the equilibrium states of large droplets conta…
A novel variation of the template route to mesoporous silica is presented, which extends the range of pore sizes that can be achieved to larger sizes. Polymer latex particles in the range from 20 to 400 nm with different surface functionalities are employed as templates. The synthesis of the latices, sol-gel processin…
We present the crystal structures and magnetic properties of a series of magnetic compounds, MII{N(CN)2}2, where M=Cu (1), Ni (2), Co (3) and Fe (4), and [Mn{N(CN)2}2(C2H5OH)2]Z·(CH3)2CO (5). In the isostructural compounds 1–4, the dicyanamide anion is triply coordinating through its three nitrogen atoms. It bridges t…
The hydrolysis and polymerization of a non-catalyzed silica sol was investigated by Fourier Transform Infrared Spectroscopy (FT-IR) and deconvolution of the infrared spectra. The hydrolysis was followed by the 1168 and 812 cm−1 bands which have been observed that decrease continously with the reaction time, and they d…
The contraction of a collagen lattice by resident fibroblasts causes strains to be developed within that lattice. These strains can be increased or decreased by altering the aspect ratio (ratio of length/width/thickness) of the fibroblast populated collagen lattice, as the cross-sectional area resisting the strain is…
A self-assembled monolayer on a planar gold substrate has been used to initiate the living cationic ring-opening polymerization of 2-ethyl-2-oxazoline. The polymer chain end was functionalized with an alkyl moiety by means of the termination reaction in order to form an amphiphilic brush-type layer. The resulting laye…
The modification of silicas and related materials by attachment of organic functionalities to their surface is an important area of research in heterogeneous catalysis and green chemistry. The methods available for the preparation of these hybrid organic–inorganic materials are reviewed, as are their applications as c…
Superparamagnetic agents in magnetic resonance imaging: physico-chemical characteristics and clinical applications. Superparamagnetic agents have been the subject of extensive research over the last decade. They consist of iron oxide nanoparticles which are highly effective in Magnetic Resonance Imaging (MRI). The par…
This paper compares the information provided by X-ray diffraction and Raman spectrometry in terms of the structural order in a wide set of carbon solids. A special emphasis is placed in checking the validity of the commonly used formula of Tuinstra and Koenig and establishing the magnitude of errors potentially derive…
The molecular characteristics of the first five generations of poly(propyleneimine) dendrimers with two different types of end groups have been investigated using small-angle neutron scattering (SANS), viscosimetry, and molecular dynamics simulations. The dimension of the poly(propyleneimine) dendrimers, as measured b…
This article will briefly review the development of metallomacrocycle syntheses and consider the distinction between equilibrium controlled self-assembly processes and kinetically controlled, but metal directed, macrocycle formation reactions. The use of octahedral rather than square planar or tetrahedral metal coordi…
THEORY OF TA. Apparatus. Measuring Conditions and Mathematical Treatment. Transition Behavior. Chemical Reactions. Physical Parameters. TA DATA. Polymers. Foods. Pharmaceuticals. Organic Materials. Explosives. Inorganic Materials Metals. Appendix.
The high-strain-rate mechanical response of α-titanium is examined in terms of the underlying deformation mechanisms that govern its macroscopic behavior. The mechanical behavior of α-titanium has been evaluated using quasistatic (10−5 to 100 s−1) compression testing with servohydraulic machines, dynamic (10−2 to 104…
This study provided the first evidence for an antioxidant action of the silk protein sericin by showing that sericin suppressed in vitro lipid peroxidation. Furthermore, sericin was found to inhibit tyrosinase activity. These results suggest that sericin may be a valuable natural ingredient for food and cosmetic indus…
Prevention of protein adsorption by the surface-grafted poly(ethylene oxide) (PEO) chains has been well-known. We have examined the mechanisms of how the grafted PEO prevents protein adsorption. PEO−poly(propylene oxide)−PEO (PEO−PPO−PEO) triblock copolymers were used to graft PEO to the trichlorovinylsilane (TCVS)-mo…
Heterometallic complexes containing 3d-/4f-metals have been made with a variety of ligands including Schiff-bases, pyridonates and amino-alcohols. The majority of species with Schiff-base ligands are trinuclear with Cu2Ln cores, and with other ligands larger oligomers are found, ranging as large as Cu12La8 and Cu12Ln6…
Ever since Wilhelm Conrad Röntgen discovered X-rays a century ago and von Laue, Friedrich, Knipping, Braggs and Braggs developed an analytical method almost nine decades ago, single crystal structure analysis has become the most powerful analytical tool used to elucidate unequivocally the three dimensional structure o…
ABSTRACT Advantages, types, formation, and properties of agricultural packaging materials based on proteins, with examples, are reviewed in detail. Proteins have long and empirically been used to make biodegradable, renewable, and edible packaging materials. Numerous cereal and vegetable proteins (such as corn zein, w…