Materials Literature
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The creation of an effective two-way shape memory alloy (TWSMA) requires appropriate heat treatment and optimal training considerations. In particular, the training method used plays a key role. This work investigates different training methods for producing NiTi TWSMA wires with the hot shape of an arc and the cold s…
Abstract Diamond‐like carbon (DLC) films are gaining attention for its use in a wide range of tribological applications because of their low friction coefficient and high wear resistance. Recently, ultra‐low friction or superlubricity as low as 0.006 has been observed between hydrogen‐free DLC films lubricated with oi…
Abstract Hyperbranched polymers have been synthesized in a microreactor for the first time, employing the known ring‐opening multibranching polymerization of glycidol. Microreactors are well‐known to be beneficial for highly exothermic reactions because of their capability to enhance mass and heat transfer due to shor…
Currently, depolymerization and decolorization of chitosan are achieved by chemical or enzymatic methods, which are time consuming and expensive. Ozone has been shown to be able to degrade macromolecules and remove pigments due to its high oxidation potential. In this study, the effects of ozone treatment on depolymer…
A two dimensional amorphous material is modeled as an assembly of mesoscopic elemental pieces coupled together to form an elastically coherent structure. Plasticity is introduced as the existence of different minima in the energy landscape of the elemental constituents. Upon the application of an external strain rate,…
Polyhydroxyalkanoates (PHAs) are accumulated as intracellular granules by many bacteria under unfavorable conditions, enhancing their fitness and stress resistance. Poly(3-hydroxybutyrate) (PHB) is the most widespread and best-known PHA. Apart from the genes that catalyze polymer biosynthesis, natural PHA producers ha…
Seeding the liquid of d -mannitol with its polymorphs (α, β, and δ) revealed several cases of cross-nucleation between polymorphs. Only seeds of the α polymorph (the structure of the intermediate thermodynamic stability and the fastest growth rate) yielded the same polymorph in new growth. Seeds of the δ polymorph yie…
Abstract A new type of rigid polyurethane foam was produced by incorporating oxazolidone heterocyclic rings on to polyurethane backbones. Epoxidized diethanolamides were synthesized by reacting palm oil blends of epoxidized palm olein and refined bleached deodorized palm kernel olein with diethanolamine to produce rig…
A new synthetic strategy toward novel alkylphenyl-substituted D 2 h symmetric zigzag nanographenes has been established, leading to different derivatives with specific substitution patterns of the disc corona. This concept allowed a facile control over the intracolumnar ordering of the molecules. For the first time, a…
Dynamic heterogeneity in glass formers has been related to their static structure using the concept of dynamic propensity. We reexamine this relationship by analyzing dynamical fluctuations in two atomistic glass formers and two theoretical models. We introduce quantitative statistical indicators which show that the d…
The reaction of Sm{N(SiMe3)2}3 with the bis(phenol)amines H2O2N(R) (H2O2N(R) = RCH2CH2N(2-HO-3,5-C6H2(t)Bu2)2; R = OMe, NMe2 or Me) gave exclusively zwitterions Sm(O2N(R))(HO2N(R)). For R = OMe or NMe2 these were efficient catalysts for the ring-opening polymerisation of epsilon-caprolactone and D,L-lactide with a ten…
We report a detailed spectroscopic investigation of temperature-induced valence and structural instability of the mixed-stack organic charge-transfer (CT) crystal $4,{4}^{\ensuremath{'}}$-dimethyltetrathiafulvalene-chloranil (DMTTF-CA). DMTTF-CA is a derivative of tetrathiafulvalene-chloranil (TTF-CA), the first CT cr…
Various types of topological defects in graphene are considered in the framework of the continuum model for long-wavelength electronic excitations, which is based on the Dirac--Weyl equation. The condition for the electronic wave function is specified, and we show that a topological defect can be presented as a pseudo…
Covalently crosslinked ultrathin films can be fabricated layer-by-layer by exploiting fast and efficient click-type reactions between polyamines and the ‘spring-loaded' functionality of poly(2-alkenyl azlactone)s. The accessibility and reactivity of residual azlactone functionality in these ultrathin materials permits…
Phase diagram and pattern formation in two-dimensional Ising model with coupling between order parameter and lattice vibrations is investigated by Monte-Carlo simulations. It is shown that if the coupling is strong enough (or phonons are soft enough) a short-range order exists in disordered phase for a broader tempera…
Electrically bistable polycrystalline nanowires are obtained by a simple electrospinning process. Two-terminal single nanowire devices that can be prepared by aligning individual AZO nanowires across paired Au electrodes are demonstrated (see figure). These AZO/gold junctions exhibited photoconductive resistance switc…
We apply a molecular theory to predict the structural properties of poly(acrylic acid) macromolecules grafted via one of their ends to solid surfaces. The theory explicitly incorporates the acid−base equilibrium responsible for the charge regulation of the acrylic groups, as well as the conformations, size, shape, and…
A mechanochemical method for the simultaneous one-step production and functionalization of silicon nanoparticles is presented. Fresh surface created through mechanical attrition of the silicon during high energy ball milling (HEBM) allows for direct reaction between the silicon and the reactive alkene or alkyne media,…
We observe a sequence of the anchoring transitions in nematic liquid crystals (NLC) sandwiched between the hydrophobic polyimide substrates treated with the plasma beam. There is a pronounced continuous transition from homeotropic to low tilted (nearly planar) alignment with the easy axis parallel to the incidence pla…
Polaron dephasing processes are investigated in InAs/GaAs dots using far-infrared transient four wave mixing (FWM) spectroscopy. We observe an oscillatory behaviour in the FWM signal shortly (< 5 ps) after resonant excitation of the lowest energy conduction band transition due to coherent acoustic phonon generation. T…