Materials Literature
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Abstract Polyimide‐ g ‐nylon 6 copolymers were prepared by the polymerization of phenyl 3,5‐diaminobenzoate with several diamines and dianhydrides with a one‐step method. The polyimides containing pendant ester moieties were then used as activators for the anionic polymerization of molten ε‐caprolactam. Nylon 6‐ b ‐po…
Biraite-(Ce), ideally Ce2Fe2+(CO3)(Si2O7), has been found in the Biraia deposit (Irkutsk district, Russia), associated with cordylite-(Ce) and -(La), aragonite, strontianite, Sr,Fe- bearing dolomite, ancylite-(Ce) and -(La), hydroxyl-bastnäsite-(Ce), daqingshanite-(Ce) and -(La), tremolite, winchite, ferriallanite-(C…
The cysteine residues of yeast alcohol dehydrogenase (YADH) were covalently modified by N-(1-pyrenyl) maleimide (PM). A maximum of 3.4 cysteines per YADH monomer could be modified by PM. The secondary structure of PM-YADH was found to be similar to that of the native YADH using far-UV circular dichroism. The covalent…
Sugar boiling experiments were carried out in a pilot vacuum pan with the aim of developing new methods for monitoring and estimation of important variables in industrial crystallization. A mathematical model based on mass balances was applied, using typical on-line data recorded during the boiling runs, to determine…
Protein nanocrystallography, a new technology for crystal growth based on protein nanotemplates, has recently been shown to produce diffracting, stable and radiation-resistant lysozyme crystals. This article, by computing these lysozyme crystals' atomic structures, obtained by the diffraction patterns of microfocused…
Among the four valid type-minerals reported in Rwanda, three were described in the Buranga pegmatite, which is host to over hundred of other mineral species More than half of the recorded minerals from Buranga are phosphates, of which two compositional groups are recognised: Al-dominant and Fe-Mn-dominant phases Where…
The physics of k-core percolation pertains to those systems whose constituents require a minimum number of k connections to each other in order to participate in any clustering phenomenon. Examples of such a phenomenon range from orientational ordering in solid ortho-para H2 mixtures to the onset of rigidity in bar-jo…
Abstract A triple‐helix‐forming collagen model peptide, (prolyl‐ trans ‐4‐hydroxyprolyl‐glycyl) 10 [(Pro‐Hyp‐Gly) 10 ], and a thermosensitive elastin‐derived pentapeptide, valyl‐prolyl‐glycyl‐valyl‐glycyl (Val‐Pro‐Gly‐Val‐Gly), were copolymerized in various mole ratios using 1‐ethyl‐3‐(3‐dimethylaminopropyl)‐carbodiim…
The avian eggshell is a highly ordered calcitic bioceramic composite, with both inorganic and organic constituents. The interactions between the inorganic and organic components within the structure are poorly understood but are likely to occur at the nanometre level. Thus structural variation at this level may imping…
Reported here are the structural properties of a zinc 2,9,16,23-tetra-tert-butyl-29H,31H-phthalocyanine Langmuir monolayer on a water surface under progressive lateral compression investigated by grazing incidence X-ray scattering. Grazing incidence diffuse X-ray scattering out of the specular plane (GIXOS) is exploit…
5,10,15,20-Tetraaryl-21-vacataporphyrin, 1 (butadieneporphyrin, annulene-porphyrin hybrid), which contains a vacant space instead of heteroatomic bridge, gives diamagnetic zinc(II) 1-ZnCl and cadmium(II) 1-CdCl and paramagnetic nickel(II) 1-NiCl complexes. A metal ion is bound in the macrocyclic cavity by three pyrrol…
This is the first part of a study of the local field effects on (non)linear optical susceptibilities of solutions of para-nitroaniline (pNA) in three different solvents, cyclohexane (CH), 1,4-dioxane (DI), and tetrahydrofuran (THF), using a discrete molecular representation of the condensed phase. To account for dipol…
Two examples of phase transition in self-assembled mesostructured hybrid thin films are reported. The materials have been synthesized using tetraethoxysilane as the silica source hydrolyzed with or without the addition of methyltriethoxysilane. The combined use of transmission electron microscopy, small-angle X-ray sc…
A series of novel AB3-type monomers were prepared from nontoxic natural gallic acid and amino acids. These monomers were then melt-polycondensed in the presence of MgO as a catalyst via a transesterification process at 170-190 degrees C to yield the hyperbranched poly(ester-amide)s bearing terminal acetyl groups. FTIR…
Abstract New poly(imide–benzoxazole) copolymers were prepared directly from a dianhydride, a diacid chloride, and a bis( o ‐diaminophenol) monomer in a two‐step method. In the first step, poly(amic acid–hydroxyamide) precursors were synthesized by low‐temperature solution polymerization in an organic solvent. Subseque…
A refined hydrochemical model for single-bubble sonoluminescence (SBSL) is presented. The processes of water vapor evaporation and condensation, mass diffusion, and chemical reactions are taken into account. Numerical simulations of Xe-, Ar- and He-filled bubbles are carried out. The results show that the trapped wate…
TEM images and measurements of SERRS (surface-enhanced resonance Raman scattering) spectra as a function of the porphyrin concentrations in systems with unmodified and chloride-modified Ag nanoparticles and protoporphyrin IX (PPIX) are reported. TEM images have shown formation of compact aggregates in systems with chl…
Amphiboles have been synthesized by hydrothermal techniques at 500–600 °C, 1 Kbar P(H2O) and low oxygen fugacity (close to NNO) at nominal compositions along the join ferri-clinoholmquistite [squareLi2Mg3Fe3+2Si8O22(OH)2] – ferri-clino-ferroholmquistite [squareLi2Fe2+3Fe3+2Si8O22(OH)2]. SEM-EDS and X-ray powder diffra…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTNew Facile Approach to Novel Water-Soluble Aliphatic Poly(butylene tartarate)s Bearing Reactive Hydroxyl Pendant GroupsQinghui Hao, Jing Yang, Qiaobo Li, Yang Li, Lin Jia, Qiang Fang, and Amin CaoView Author Information Laboratory for Polymer Materials, Shanghai Institute of Or…
Abstract Compatibilized blends of poly(ethylene terephthalate (PET) with an aromatic polyamide such as poly( m ‐xylylene adipamide) (MXD6) have good transparency ( T ) because the constituent refractive indices (RIs) match closely. However, haziness is observed when the blends are stretched. This study demonstrated th…