Materials Literature
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A new class of periodic mesoporous organosilicas (PMOs) with 4-phenyl ether and 4-phenyl sulfide bridge-bonded silsesquioxanes integrated into the pore walls to create ligand channels have been synthesized using inorganic salt-assisted self-assembly directed by a supramolecular polyoxyethylene (10) stearyl ether (Brij…
Abstract To examine the feasibility of whey protein isolate (WPI) coating as an alternative oxygen barrier for food packaging, heat‐denatured aqueous solutions of WPI with various levels of glycerol as a plasticizer were applied on corona‐discharge‐treated low‐density polyethylene (LDPE) films. The resulting WPI‐coate…
O presente trabalho tem por objetivo estudar o comportamento térmico e o mecanismo de decomposição térmica de compósitos de poliuretano nas proporções de: 5, 10 e 20%(p/p) de fibra de curauá. As amostras foram caracterizadas por técnicas de análise térmica (TG, DTG, DTA e DSC) e propriedades mecânicas (resistência à t…
The correlation $$(\bar a_2 + \bar a_3 ) = (\bar a_1 + \bar a_4 )$$ has been established for the mean parameters of the reduced perovskite unit cells, $$\bar a_1 ,\bar a_2 ,\bar a_3 $$ and $$\bar a_4 $$ of four arbitrary compounds with the perovskite structure having the compositions (1) ABX 3, (2) A′BX 3, (3) AB′X 3,…
Semi-empirical ZINDO SOS and ab initio quadratic response function (DDRPA) calculations on a series of donor–acceptor substituted π-conjugated chromophores based on styryl benzothiazoles are used to aid in the design of dyes with high non-linear optical properties. Structural modifications studied include nature and p…
Adiabatic calorimetry of water confined within nano‐pores of silica gel was carried out. The water within pores was classified into two parts, namely interfacial water and internal water. Water within 3 nm pores was well prevented from crystallization, and showed a heat capacity peak at 227 K and two glass transitions…
Foreword. Chapter 1. Introduction (B. Fultz). Chapter 2. Experimental Techniques and Instrumentation (R.F. Egerton). Chapter 3. EELS Quantitative Analysis (R.D. Leapman). Chapter 4. Energy Loss Fine Structure (P. Rez). Chapter 5. Energy Filtered Diffraction (L. Reimer). Chapter 6. EFTEM Elemental Mapping in Materials…
Excited-state dynamics and mechanisms of the rapid deactivation process of indigo carmine (InC) were investigated by means of femtosecond transient absorption spectroscopy and steady-state Raman spectroscopy. Solvent dependence of the excited-state lifetime revealed that intermolecular hydrogen-bonding with the solven…
In this paper, we report that novel multiwalled carbon nanotube (MWNT)/BaTiO3 nanocomposite ceramics were successfully fabricated via a hot-press sintering approach. Well dispersed MWNT–BaTiO3 composite powders were prepared by primarily synthesizing a new BaTiO3–MWNT hybrid material and then mixing it with tetragonal…
The properties of multi-functional CuCr and CuCrZr alloys with ultra fine grains (UFG) produced by equal-channel angular pressing (ECAP) have been investigated in dependence of concentration of alloying elements. A special attention is paid to optimization of fatigue performance together with strength, thermal and ele…
We first electrodeposited highly ordered nanowires using a home-made alumina template. Home-made nanoporous alumina templates were prepared by a two-step anodization method and selective removal of aluminum substrate by bromine solution. Chronopotentiometry ( i.e. , constant current method) of was applied to deposit c…
The synthesis and properties of a series of bi- and terthiophenes 3–8 substituted with meso-tetraphenylporphyrin (TPP) groups via an isolating oxaalkyl chain is described. Electrooxidative polymerization leads to the corresponding metal complexed porphyrin-functionalized polythiophenes P4–P8. The electrochemical and s…
A perylene derivative, n-(n-butyl)-n′-(4-aminobutyl) perylene-3,4,9,10-tetracarboxylic acid diimide (simplified as nBu-PTCD-(CH2)4-NH2) has been chosen as the target molecule for studies involving single molecule detection (SMD) using Raman scattering. The enhancement of the Raman signal is the result of the multiplic…
Heterometal alkoxide [YAl(OPri)6(PriOH)]2 has been used as a molecular template for the controlled and selective synthesis of metastable yttrium aluminate (YAlO3, YAP) in nanocrystalline form. The results indicate that the strict control over the Y∶Al ratio (1∶1) in the precursor suppresses the formation of other Y∶Al…
The aim of this study was to evaluate the dynamic fatigue strengths at 10(5) cycles and the strains of particulate filler composite resins with and without reinforcing fibers. An UHMWPE (Ribbond), a polyaromatic polyamide fiber (Fibreflex), and three glass fibers (GlasSpan, FibreKor, Vectris Frame) were used to reinfo…
Accelerated weathering studies of untreated and treated oil palm fiber reinforced phenol formaldehyde composites and oil palm/glass hybrid fiber reinforced phenol formaldehyde composites were conducted. Thermal, water, biological and γ radiation effects on the composite properties were analysed. Mechanical properties…
The temperature and the oxygen partial pressure dependencies of the hole and electron conductivities of 20 mol doped Y, Gd, Sm, Nd, La) were measured by the dc polarization method using a Hebb-Wagner's ion blocking cell at 973-1273 K in the oxygen partial pressure range of to −1. All measured data were fitted to the s…
Endonuclease BamHI mutants having an azophenylalanine residue in the dimer interface (azoAla-BamHI) were synthesized; while the activity was almost suppressed using trans-azoAla-BamHI, the cis-isomer generated with photoirradiation recovered its intrinsic activity.
Dimerization of monoporphyrinate lanthanide complexes [Yb(Por)(H(2)O)(3)]Cl, (Por = TTP(2-), TMPP(2-) and TPP(2-)) in the presence of sterically hindered tripodal ligand, zinc Schiff-base, dilute HCl, K(2)CO(3) solution, 4,4'-bipyridine (bipy), and basic 8-hydroxyquinaldine (HQ) solution was observed in CH(2)Cl(2) at…
Abstract Summary: A review of the processes underlying the solid state postcondensation of poly(ethylene terephthalate) (PET) is presented. Fundamental aspects of the reactions are treated, and it is shown that the rate of polycondensation in the solid state depends on the relative rates of two types of diffusion. On…