Materials Literature
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The grain size dependence of yield stress has been investigated for nanocrystalline (nc) bulk aluminum produced by hot extrusion of ball-milled powders. The Hall-Petch slope is positively deviated as the grain size is reduced below 60 nm. For the specific grain size range from 60 nm down to 48 nm, structural analyses…
Stable solid-like vesicles were prepared via a facile ionic self-assembly (ISA) route, through complexation between 1-naphthylammonium chloride (NA) and sodium deoxycholate (NaDC), and the vesicles could entrap hydrophilic quantum dots (QDs) to exhibit fluorescence microscopy images and transform to nanobelts with tem…
5-Hexylthiophene-fused porphyrazines were designed and synthesized as novel soluble phthalocyanine derivatives. Single-crystal X-ray structural analyses indicated that they have a well-ordered structure in the solid state in spite of the existence of disorder in the thiophene-fused porphyrazine core. Due to the high s…
In this paper we describe dewetting phenomena in organic (polystyrene, PS)/inorganic (polyferrocenyldimethylsilane, PFS) block copolymer thin films. Mesoscale dendritic structures are induced when the spin-cast thin film of this polymer is subjected to so-called hybrid annealing, which involves both thermal and solven…
Highly efficient migration has been observed for soft liquid-crystalline azobenzene-containing polymer films to form surface relief gratings (SRGs). The efficient migration is probably driven by the interfacial instability at boundaries between the smectic liquid-crystalline phase and photo-induced isotropic one. Howe…
Superlattices are considered one of the most promising material systems for nanotechnological applications in fields such as high figure of merit (ZT) thermoelectrics, microelectronics, and optoelectronics owing to the possibility that these materials could be tailored to obtain desired thermal properties. Factors tha…
Distant and intense electronic communication between two amine sites through a porphyrin pi-spacer was quantified with inter-valence charge transfer (IVCT) band analyses.
We compare the macroscopic and magnetic properties of three spin crossover compounds, [FeII(2-pic)3]Cl2·EtOH, [FeII(2-pic)3]Cl2·2-PrOH and [FeII(2-pic)3]Cl2·(EtOH)0.744·(2-PrOH)0.256 (pic = picolylamine), with their crystal structures in high-spin, low-spin and photoexcited high-spin states. We show that the spin conv…
The synthesis and characterization of a series of novel liquid-crystalline molecules containing a trifluoromethylphenyl core or a 2,3-bis(trifluoromethyl)phenyl core is described. All trifluoromethylphenyl-containing compounds (W530, W551, and W558) have mesomorphic properties while 2,3-bis(trifluoromethyl)phenyl-cont…
or O. This adsorbed oxygen gets trapped at the grain boundary trap states, thereby increasing the grain boundary potential barrier. This culminates in an increase in resistivity of the material. For reducing gases, the trap states get depleted of charge carriers and thereby reduce the resistance through lowering of th…
Graphene is a promising nanoelectronic material that may replace silicon owing to its extraordinary electronic properties.Among many other methods of making Graphene,epitaxial growth on silicon carbide is of great potential in electronic application.In this paper,the band structure of Graphene is first introduced and…
This paper presents the results of studies carried out at the Textile Research Institute in Łodź, aimed at developing multi-layer, flat or spatial textile-polymeric materials, designed for shielding electromagnetic radiation (EMR), showing a possible high absorption coefficient, a so-called insertion loss of ≥ 40%. Th…
Na-rich montmorillonite (MMT) was intercalated with silver cations, which were subsequently reduced with formaldehyde or sodium borohydride. The silver-montmorillonite nanocomposites were studied by UV-visible spectrometry, transmission electron microscopy (TEM) and X-ray diffractometry (XRD). The influence of differe…
Complexes of Gd, Eu and Yb(III) have been prepared with a series of heptadentate ligands related to the parent complex AAZTA, based on the 6-methyl-6-aminoperhydrodiazepine moiety. For (RR) and (RS)-diastereoisomers of a di-glutarate ligand, solution NMR studies revealed the presence of two major species that undergo…
2 Abstract: The residual film toxicity, fumigant toxicity and repellent effect of methanol extract of root bark of Calotropis gigantea (Linn) and its chloroform and petroleum ether (40-60°C) soluble fractions were evaluated against several inster of larvae and adult of Tribolium castaneum. In residual film toxicity, m…
In this study, a technological procedure for the production of a molding compound based on short carbon fibers and an ablative phenol-formaldehyde resin for high temperature application was optimized. The starting raw materials were characterized and molding compounds with different fiber/ /matrix ratios and different…
Four transition metal incorporated phosphotungstates have been synthesized through the reaction of Na(2)WO(4), H(3)PO(4), Co/Ni(NO(3))(2), and the multifunctional amine N,N'-Bis(2-hydroxyethyl) piperazine (bhep). Na(2){MHbhep(H(2)O)(4)}[PW(10)M(2)O(38){Hbhep}(2)] M = Co(2+) (1), and Ni(2+)(2) represent rare examples o…
Stepwise reactions of [Et(4)N][Tp*WS(3)] () (Tp* = hydridotris(3,5-dimethylpyrazol-1-yl)borate) with 1-4 equiv. of CuNCS (and Et(4)NBr in the case of three equiv. of CuNCS) afforded the [1 + 1] to [1 + 4] addition products [Et(4)N][Tp*WS(mu-S)(2)(CuNCS)].0.5CH(2)Cl(2) (.0.5CH(2)Cl(2)), [Et(4)N][Tp*W(mu(3)-S)(mu-S)(2)(…
The phase formation in the BaB 2 O 4 -NaF cut has been investigated by the methods of solid-phase synthesis, visual polythermal analysis, and spontaneous crystallization on a platinum loop. A range of primary crystallization of the new compound Ba 2 Na 3 [B 3 O 6 ] 2 F (hexagonal system, P 6 3 / m , a = 7.346(1) Å, c…
Using infrared spectroscopy, a comparative investigation was carried out of the surface properties of mesoporous aluminas prepared by the carbon templating route and of a commercial alumina PURAL SB. In the hydroxylated state the mesoporous materials bear surface OH groups terminally bonded to an octahedral Al3+ ion,…