Materials Literature
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Aromatic polyelectrolytes based on sulfonated poly(benzobisthiazoles) (PBTs) have been synthesized by a polycondensation reaction of sulfo-containing aromatic dicarboxylic acids with 2,5-diamino-1,4-benzenedithiol dihydrochloride (DABDT) in freshly prepared polyphosphoric acid (PPA). Several sulfonated PBTs, poly[(ben…
Facile ring-opening polymerization of cyclic aryl ether oligomers containing the 1,2-dibenzoylbenzene moiety to form high molecular weight linear polymers in the presence of a nucleophilic initiator is described. The polymerization can be initiated in the melt in the presence of a nucleophilic initiator such as potass…
Semicrystalline fluoropolymers including poly(tetrafluoroethylene) (PTFE), a 8 mol % hexafluoropropylene (HFP)/92% TFE random copolymer (FEP), and poly(vinyl fluoride) (PVF) were studied using thermally stimulated current depolarization (TSC), ac dielectric, and other thermal analysis techniques. The TSC thermal sampl…
A series of novel bis(phenoxy)naphthalene-containing polyamides having inherent viscosity up to 2.02 dL/g were synthesized by the direct polycondensation of the diamine 1,7-bis(4-aminophenoxy)naphthalene with various aromatic dicarboxylic acids in N-methyl-2-pyrrolidone (NMP) using triphenyl phosphite and pyridine as…
Spherical-nose copper and tantalum rods with aspect ratios between 4.0 and 14.6 were gun launched against 91-cm-diameter and 91-cm-long concrete and simulant reinforced-concrete targets with velocities ranging from 0.15 cm/μs to 0.19 cm/μs. Targets were instrumented with a sequence of break gauges that provided valuab…
Abstract Water inhibits sorption of uncharged organic compounds on montmorillonites saturated with small alkylammonium cations such as tetramethylammonium (TMA) and trimethylphenylammonium (TMPA). As a first step toward understanding the mechanism by which water inhibits arene sorption on TMA- and TMPA-montmorillonite…
The reverse Monte Carlo (RMC) method has been used to generate a model for the atomic structure of amorphous germanium (a-Ge). Fitting to experimental neutron diffraction data and applying coordination number and ``triplet'' constraints, the positions of 3000 ``atoms'' in a box, with full periodicity, were altered unt…
The structure of the ζ-phase in the Pu—U system has been determined by neutron powder diffraction. The phase crystallizes in space group R {\bar 3} m with 58 atoms in the primitive unit cell and 10 atoms in the asymmetric unit. The structure is characterized by many short bonds and fits the general pattern of the ligh…
Polarized absorption and fluorescence spectra were analyzed to establish individual energy (Stark) levels of Nd3+ ions in host crystals of Sr5(PO4)3F (SFAP) and Ca5(PO4)3F (FAP). Site-selective excitation and fluorescence facilitated differentiation between Nd3+ ions in emitting sites associated with 1.06 μm stimulate…
Freshly harvested beansprouts displayed a respiration rate of about 1 mmol O2 kg−1 h−1 at 10°C which was strongly dependent on temperature, a 10-fold increase being observed every 16·5°C (z=16·5°C, ie Q10=4·4). This commodity is also characterised by a high initial microbial load (about 107 cells g−1). During storage…
The crystal structure of shigaite, [AlMn (super 2+) 2 (OH) 6 ] 3 (SO 4 ) 2 Na(H 2 O) 6 {H 2 O} 6 , rhombohedral, a 9.512(1), c 33.074(5) Aa, V 2591.0(8) Aa 3 , Z = 3, R3, has been solved by direct methods and refined to an R index of 4.2% using 979 observed reflections measured with MoKalpha X-radiation. The structura…
The crystal structure of clinoatacamite, Cu 2 (super 2+) (OH),Cl, has been determined and refined to indices R = 5.2 and wR = 4.9%. The structure is monoclinic, space group P2 1 /n (14), with cell parameters a 6.144(1), b 6.805(1), c 9.112(1) Aa, beta 99.55(3) degrees , V 375.7(2) Aa 3 , and with Z = 4. The structure…
The temperature effect on gold nanodispersion in organic liquids was examined by optical absorption spectroscopy and transmission electron microscopy. It was found that the color of the dispersion changed from purple just after preparation under a low-temperature condition to reddish purple or pink with the elevation…
Emulsion copolymerization of silicones (octomethyl tetracyclosiloxane, D4 and methacryloxypropyl trimethoxy silane, MATS) and acrylics was carried out using three different polymerization processes: semicontinuous monomer emulsion addition, batch and initiator solution addition. Results showed that only the semicontin…
Abstract Active polymers containing peroxide groups were synthesized via polymerization of styrene or methyl methacrylate with oligo(adipoyl 2,5‐dimethylhexane‐2,5‐diyl peroxide) (OAHP) or oligo(2,5‐dimethylhexane‐2,5‐diyl 4,4′‐azobis(4‐cyanoperoxyvalerate)) (LUAB). Poly(β‐hydroxynonanoate) (PHN) and the active polyme…
The crystal structure of namuwite, (Zn,Cu)4S04(OHk4H20, trigonal, a = 8.331(6), C = 10.54(1) A, V = 634(1) A3, Pj, Z = 2, has been solved by direct methods and refined to an R index of 7.9% using MoKa X-ray data. The fundamental building unit of the structure is a gently modulated sheet of edge-sharing (Zn,Cu) octahed…
Porous GaP layers prepared by electrochemical anodization of (1 0 0) and (1 1 1) A-oriented n-GaP crystalline substrates in HF solution have been studied by Raman spectroscopy. A surface vibrational mode at 397 cm−1 was observed in porous GaP. The process of anodization results in downward shifts of the TO and LO phon…
The coincidence problem for planar patterns with N-fold symmetry is considered. For the N-fold symmetric module with N<46, all isometries of the plane are classified that result in coincidences of finite index. This is done by reformulating the problem in terms of algebraic number fields and using prime factori…
UNLABELLED: We conducted a systematic study of the effects of liposome formulation and encapsulated radionuclides on imaging ability. METHODS: Various types of liposomes were prepared and labeled with 67Ga, 111In or 99mTc. Their tumor-imaging potential was evaluated in terms of tumor accumulation and tumor-to-blood ra…
Thermosensitive liposomes are microscopic vesicles that can contain drugs and release them effectively in response to hyperthermia. To deliver an antitumor drug specifically to brain tumor, the authors used thermosensitive liposomes containing cis-diamminedichloroplatinum (CDDP) in conjunction with localized brain hea…