Materials Literature
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We theoretically and experimentally study the mechanical response of silkworm and spider silks against stretching and the relationship with the underlying structural factors. It is found that the typical stress-strain profiles are predicted in good agreement with experimental measurements by implementing the “β-sheet…
A PEG-NH2-based environmentally friendly surface modification strategy was developed for PDMS microchips to prevent protein adsorption and to enhance separation performance. PEG-NH2 was synthesized using a modified synthesis procedure. A two-step grafting method was used for PDMS modification. FTIR absorption by atten…
A series of remote hydroxyl functionalized organoimido derivatives of hexamolybdate, (Bu(4)N)(2)[Mo(6)O(18)(Cres)] (1) (Cres = 4-amino-m-cresol), (Bu(4)N)(2)[Mo(6)O(17)(Cres)(2)] x H(2)O (2), (Bu(4)N)(2)[Mo(6)O(18)(Phen)] x i-PrOH (Phen = p-aminophenol)(3), (Bu(4)N)(2)[Mo(6)O(18)(Phen)] x EtOH (4), (Bu(4)N)(2)[Mo(6)O(…
Terebratulide brachiopod shells have a thin, hard outer nanocrystallinecalcite layer and a hybrid fibre composite inner layer with CaCO(3)fibres embedded in an organic matrix. Here we report our observation bytransmission electron microscopy (TEM) of a large compartment filledwith amorphous calcium carbonate (ACC) in…
Poly(tert-butyl acrylate) (PtBA) bruhes were successfully grafted on the cellulose filter papers via surface-initiated atom transfer radical polymerization (ATRP). Then the grafting PtBA brushes were transferred into poly(acrylic acid) (PAA) in the presence of trifluoroactic acid (TFA), which can form chelate complexe…
Density functional theory (DFT) studies have revealed the energetically favorable reaction paths for oxidation of CO on Pd(4) cluster. Adsorption of various species such as O(2), 2O, O, CO, CO(2), and coadsorbate combinations, including O(2)+CO, 2O+CO, O+CO, and O+CO(2) on neutral, cationic, and anionic Pd(4) clusters…
Density Functional Theory (DFT) calculations on transition metal nitrosyls often reveal unusual spin density profiles, involving substantial spatial separation of majority and minority spin densities. Against this context, there is a significant lack of studies where DFT calculations have been quantitatively calibrate…
Detailed phase diagrams are necessary for improving the temperature stability of piezoelectric properties of (Na,K)NbO3-based solid solutions. We report the phase diagrams of the (1−x)Na0.5K0.5NbO3–xMTiO3 (M=Pb, Ba, Sr, Ca, and Bi0.5Li0.5) solid solutions over a broad temperature range of 10 K≤T≤∼770 K. It is found th…
We report on the electron tunneling characteristics on La0.7Sr0.3MnO3 (LSM) thin-film surfaces up to 580 °C in 10−3 mbar oxygen pressure, using scanning tunneling microscopy/spectroscopy (STM/STS). A thresholdlike drop in the tunneling current was observed at positive bias in STS, which is interpreted as a unique indi…
The low-temperature dielectric relaxation of collagen and elastin was studied over a wide range of hydrations h. The hydration-shell response increases weakly with temperature, is thermally activated, and conforms to energy barrier scaling. This demonstrates the existence of a decoupled, secondary relaxation akin to t…
Unprecedented porphycene complexes, containing a [RuCp*] (Cp*: pentamethylcyclopentadienyl) fragment accommodated in the central N(4) core or directly bonded to the "pi-face" of the macrocycle have been prepared and fully characterized, including via single crystal X-ray diffraction analysis. The optical and electroch…
Hydrothermal reaction of CoCl(2) with trans-3-pyridylacrylic acid (3-pycaH) and Et(3)N results in the formation of a new three-dimensional network formulated as [{Co(4)(mu-H(2)O)(2)(3-pyca)(8)}(0.94){Co(5)(mu(3)-OH)(2)(3-pyca)(8)}(0.06)]. Magnetic measurements reveal that spin-canting and metamagnetic behavior coexist…
We report the synthesis of Mn-substituted titania nanosheets and the preparation of room-temperature ferromagnetic thin films via layer-by-layer assembly of these nanosheets. Ti (5.2−2 x )/6 Mn x /2 O 2 ( x = 0.0−0.4) nanosheets were synthesized by delaminating layered titanates [K 0.8 Ti (5.2−2 x )/3 Li (0.8− x )/3 M…
Ferroelectric (Na 1/2 Bi 1/2 )TiO 3 –BaTiO 3 (BNT–BT) single perovskite thin films have been prepared, for the first time, by chemical solution deposition onto Pt/TiO 2 /SiO 2 /(100)Si substrates. A solution process has been developed for the preparation of precursor solutions. The handling of all the chemical reagent…
Abstract Even for samples exhibiting excellent electronic properties in terms of carrier mobility, sample‐to‐sample variability remains considerable and dislocation density is still very high, the latter characteristic being often related to damages induced either by the substrate polishing step or by substrate bulk d…
Electrospinning offers an attractive opportunity for producing silk fibroin (SF) nano/micro fibrous scaffolds with potential for tissue regeneration and repair. Electrospun scaffolds of silk fibroin were fabricated as a biomimetic scaffold for tissue engineering. The morphology of the electrospun scaffolds was investi…
To test the molecular exciton theory for heterodimeric chromophores, various heterodimers and clusters, in which two different dyes were stacked alternately, were prepared by hybridizing two oligodeoxyribonucleotides (ODNs), each of which tethered a different dye on D-threoninol at the center of the strand. NMR analys…
The expression for hardness related to crystal orientation is proposed. Because all quantities in the equation are inherently coupled to the atomistic structure of matter, the anisotropy of hardness can be determined by first-principles methods. The calculations show the highest hardness is in ${\text{ReB}}_{2}$ and $…
Abstract A series of tetradentate dimeric salicylaldimine ligands (H 2 L n R m ) with terminal chains of variable length (R m ) and a central flexible (CH 2 ) n spacer (L n = 10 and 12) was synthesized. For all ligands, according to their rod‐like molecular shape, mesomorphism characteristic of calamitic systems (nema…
OBJECTIVE: The aim of this study was to evaluate histologically the bio-degradation of two layers of Bio-Gide((R)) (BG) membrane, as compared with that of a single layer. MATERIAL AND METHODS: Two circular calvarial bony defects, 5 mm in diameter, were made in 24 Wistar rats. BG membrane, labeled with biotin, was cut…