Materials Literature
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A new process for coating a mesoporous silica gel with a mixture of the grafting reagents para-aminophenyltrimethoxysilane and phenyltrimethoxysilane is thoroughly analyzed. The dilution of para-aminophenylsilane with phenylsilane at different ratios allows the density of the functional amino groups present on the sil…
A simple and efficient approach was developed for the synthesis of a series of cationic water-soluble oligofluorenes up to a chain length of a heptamer. Bromoalkyl-substituted fluorenyl boronic esters as the key intermediates were synthesized by using a modified Miyaura reaction. With an increasing number of repeat un…
Low adhesion with normal metals is an intrinsic property of many quasicrystalline surfaces. Although this property could be useful to develop low friction or non-stick coatings, it is also responsible for the poor adhesion of quasicrystalline coatings on metal substrates. Here we investigate the possibility of using c…
We present a review of experimental studies of adsorption systems where pseudomorphic growth on quasicrystal surfaces has been observed. From these studies, we correlate information on the known or suggested adsorption and nucleation sites. For fivefold surfaces of icosahedral quasicrystals, two favoured locations eme…
In the present work, strong polybase quaternized hydroxyethyl cellulose ethoxylate (HECE) and weak polyacid alginate (AA) were assembled into {HECE/AA} n layer-by-layer (LBL) films on electrodes by electrostatic interaction between them, and the films were then immersed in myoglobin (Mb) solution to load Mb into the f…
In this paper, a new net‐shaping process, an hydrolysis‐induced aqueous gelcasting (GC) (GCHAS) has been reported for consolidation of β‐Si 4 Al 2 O 2 N 6 ceramics from aqueous slurries containing 48–50 vol%α‐Si 3 N 4 , α‐Al 2 O 3 , AlN, and Y 2 O 3 powders mixture. Dense ceramics of same composition were also consoli…
Local order of liquid Ti is studied by ab initio molecular dynamics to address the unique liquid structure factor in experiments reported recently. The present study reveals that the local order of liquid Ti is in the form of fragments of the distorted icosahedral short range order, where the distortion is induced by…
The synthesis of a new phthalonitrile derivative (4-(benzo[d]thiazol-2-ylthio)phthalonitrile), its metal-free phthalocyanine, and metallo-phthalocyanines are described. Phthalocyanines are formed in high yield with template synthesis. These compounds showed considerable solubility in CHCl3, DMF and DMSO, a primary con…
Abstract In this work, the surface–protein interfacial noncovalent interactions are generated and tuned as hydrogen bonding, hydrophobic affinity, electrostatic interaction, and additional π‐π overlapping through designing suitable surface property with different chemical moieties and varying the pH of adsorption medi…
Theoretical studies based on density functional theory framework have been performed on covalently functionalized carbon nanotubes (NTs) with azomethine ylides using SIESTA and CPMD codes. In view of the binding energies, it is found that armchair tubes favor functionalization at C−C bonds slanted to the tube axes, wh…
In this investigation, fully thermomechanically coupled constitutive and energy equations for shape memory alloys (SMAs) that include the effect of transformation induced plasticity are presented. This is followed by a micromechanical analysis for the establishment of the fully coupled thermomechanical constitutive eq…
Highly ordered lamellar-type mesoporous silica was prepared by using molecular assemblies formed in an aqueous mixture of cationic cetyltrimethylammonium bromide (CTAB) and anionic sodium octylsulfate (SOS) as structure-directing agents. The mesoporous silica prepared at the composition of CTAB:SOS = 7.5:2.5 (in mol r…
LaPO 4 /Al 2 O 3 composites were fabricated by spark plasma sintering. The effects of LaPO 4 contents on the mechanical properties of the composites were investigated. The bending strength and fracture toughness can reach the maximum value of 568.2±30 MPa and 4.8±0.5 MPa·m 1/2 for the composite with 16.4 vol% LaPO 4 a…
Numerous experimental and computational studies have been carried out in recent years to understand the mechanisms governing the compaction of granular systems. Here the problem is further investigated from a different perspective. We compact spheres by a vibrational annealing method and show how the interactions betw…
A new method for evaluating surface passivation of silicon surfaces using a strongly adsorbing and fluorescing perylenediimide (PDI) dye is reported. Silanes containing differing reactive groups delivering a trimethylsilyl moiety were investigated for their ability to passivate glass surfaces, both from solution and i…
The formation of interfaces of simple crystals with icosahedral quasicrystals has been described. Crystals take on various orientation relationships (ORs) with the quasicrystals in order to make low energy interfaces by matching close packed planes across the interfaces. In the icosahedral phase the closest packed pla…
Ultrafast laser excitation of an InGaAs/InAlAs superlattice (SL) creates coherent folded acoustic phonons that subsequently leak into the bulk (InP) substrate. Upon transmission, the phonons become "unfolded" into bulk modes and acquire a wave vector much larger than that of the light. We show that time-resolved x-ray…
Composites of PP and coir fibers were prepared in a mixer. Two coupling agents were added with view to improve the properties of the composites. The first one was a laboratory-made silane-functionalized-PP and the other was a commercial maleated-PP. The results indicated that the coir fibers acted as reinforcing fille…
${\text{VO}}_{2}$ thin-film planar-type junctions with the size of $1500\text{ }\ensuremath{\mu}\text{m}$ in width and $10\text{ }\ensuremath{\mu}\text{m}$ in length were fabricated on ${\text{Al}}_{2}{\text{O}}_{3}$ (0001) substrates, and the electric-field-induced resistance switching (EIRS) characteristics were inv…
Different epoxide compound influence on two component silyl-terminated polymer/epoxide systems mechanical, rheological and adhesion properties Ritvars Berzins, Remo Merijs Meri and Janis Zicans - Nonmonotonic dependence of adhesion between liquid aluminum and silicon surface on the temperature of the surface Zhanying