Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Amino acid ester substituted polyphosphazenes are attractive candidates for various biomedical applications because of their biocompatibility, controllable hydrolytic degradation rates, and nontoxic degradation products. In this study, the biocompatibility of three L-alanine ethyl ester functionalized polyphosphazenes…
Graft copolymers were designed that self-assemble into hydrogels mediated by the interaction of coiled-coil peptide domains. A linear hydrophilic polymer of HPMA was chosen as the backbone, and coiled-coil forming peptides, covalently attached to the backbone, formed the grafts. Microrheology was used to evaluate the…
Collagen treatment: Gold nanoparticles conjugated with collagen mimetic peptide (CMP) form stable adducts with collagen fibers (see picture) that are visible by transmission electron microscopy, thereby allowing the study of binding interactions between CMPs and type I collagen fibers. This labeling technique may pote…
Abstract Summary: Mesoporous silica was used as substrate for the grafting of alkyl halides initiators. The control over the surface‐initiated polymerization of styrene and MMA, in terms of molar mass and molar mass distribution, was successfully achieved using an ATRP mechanism. The occurrence of the polymerization i…
High-strength polyimide mats have been formed from electrospun nanofibers of a rigid-rod-like poly(p-phenylene biphenyltetracarboximide) (see Figure). Non-woven mats of aligned nanofibers have a tensile strength of 664 MPa and a tensile modulus of 15.3 GPa. These high-performance electrospun nanofibers with excellent…
The weak anisotropy of the interfacial free energy $\ensuremath{\gamma}$ is a crucial parameter influencing dendritic crystal growth morphologies in systems with atomically rough solid-liquid interfaces. The physical origin and quantitative prediction of this anisotropy are investigated for body-centered-cubic (bcc) f…
Density functional electronic structure studies of tetragonal ${\mathrm{PbVO}}_{3}$ are reported. The results show an important role for both $\mathrm{Pb}\phantom{\rule{0.2em}{0ex}}6p\text{\ensuremath{-}}\mathrm{O}\phantom{\rule{0.2em}{0ex}}2p$ and $\mathrm{V}\phantom{\rule{0.2em}{0ex}}d\text{\ensuremath{-}}\mathrm{O}…
A Mn valence instability on ${\mathrm{La}}_{2∕3}{\mathrm{Ca}}_{1∕3}\mathrm{Mn}{\mathrm{O}}_{3}$ thin films, grown on $\mathrm{La}\mathrm{Al}{\mathrm{O}}_{3}$ (001) substrates is observed by x-ray absorption spectroscopy at the Mn $L$-edge and O $K$-edge. As-grown samples, in situ annealed at $800\phantom{\rule{0.2em}{…
We investigate the bulk magnetic, electron paramagnetic resonance, and magneto-optical properties of ${{\mathrm{Ni}}_{4}{\mathrm{Mo}}_{12}}$, a magnetic molecule with antiferromagnetically coupled tetrahedral ${\mathrm{Ni}}^{\mathrm{II}}$ in a diamagnetic molybdenum matrix. The low-temperature magnetization exhibits s…
The formation of ZnO nanorings and nanohelices with large polar surfaces observed in experiments [Nano Lett. 3, 1625 (2003); J. Am. Chem. Soc. 126, 6703 (2004)] is shown to be a result of the competition between elastic energy, spontaneous polarization-induced surface energy, volume energy, and defect-induced energy.…
Carbon-nanotube-reinforced polyaniline fibers (see Figure) possess improved breaking strength and higher operating stress levels than neat polyaniline, potentially allowing generation of larger stresses by electrochemical actuators containing these fibers. The fibers have tensile strengths of 255 MPa and operate to st…
Abstract Honeycomb‐structured, porous films with pore sizes ranging from 200 nm to 7 μm were prepared with breath figures. The regularity of the hexagonal array and the pore size was influenced by the polymer architecture and the casting conditions. A nanoscaled suborder next to the microarray was obtained with amphip…
A platform for controlled drug delivery using a conductive-polymer substrate has been created. Through the incorporation of biotin into the conductive polymer polypyrrole (PPy) and the subsequent attachment of the desired drug molecule (such as nerve growth factor, NGF) via a streptavidin linker, an applied potential…
The homodimeric mammalian fatty acid synthase is one of the most complex cellular multienzymes, in that each 270-kilodalton polypeptide chain carries all seven functional domains required for fatty acid synthesis. We have calculated a 4.5 angstrom-resolution x-ray crystallographic map of porcine fatty acid synthase, h…
Abstract not available.
A number of short peptide amphiphiles consisting of dipeptides linked to fluorenylmethoxycarbonyl spontaneously form fibrous hydrogels under physiological conditions (see figure). The structural and physical properties of these gels are dictated by the amino acid sequence of the peptide building blocks, and the gels s…
In this book, the mathematical principles and working methods of single-particle reconstruction are described; a method designed to retrieve three-dimensional structural information from electron micrographs showing thousands of “copies” of biological molecules trapped in a thin layer of ice. This technique is uniquel…
An applied electric field can reversibly change the temperature of an electrocaloric material under adiabatic conditions, and the effect is strongest near phase transitions. We demonstrate a giant electrocaloric effect (0.48 kelvin per volt) in 350-nanometer PbZr(0.95)Ti(0.05)O3 films near the ferroelectric Curie temp…
Nanomagnetism is a rapidly expanding area of research in nanoscience, opening perspectives of novel applications. Magnetic molecules are at the very bottom of the possible size of nanomagnets, and they provide a unique opportunity to observe the coexistence of quantum and classical properties. The discovery in the ear…
Researchers at the National Institute of Advanced Industrial Science and Technology (AIST) in Japan have developed a prototype solid oxide fuel cell that operates with high energy efficiency at the relatively low temperature of 570°C, according to a report in the Nikkei Business Daily .