Materials Literature
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Control of surface wetting properties to produce strongly hydrophobic or hydrophilic effects is at the heart of many macro- and microfluidic applications. In this work, we have investigated coaxial electrospinning to produce core-sheath-structured nano/microfibers that combine different properties from individual core…
We experimentally investigate drop impact dynamics onto different superhydrophobic surfaces, consisting of regular polymeric micropatterns and rough carbon nanofibers, with similar static contact angles. The main control parameters are the Weber number We and the roughness of the surface. At small We, i.e., small impa…
A biocompatible, multimodal, and theranostic functional iron oxide nanoparticle is synthesized using a novel water-based method and exerts excellent properties for targeted cancer therapy, and optical and magnetic resonance imaging. For the first time, a facile, modified solvent diffusion method is used for the co-enc…
Abstract Silicon, in its various forms, finds widespread use in electronic, optical, and structural materials. Research on uses of silicon and silica has been intense for decades, raising the question of how much diversity is left for innovation with this element. Shape variation is particularly well examined. Here, w…
Single-walled-carbon-nanotube (SWNT) films are prepared with high transparency, electrical conductivity, and uniformity, with exceptionally low surface roughness, on arbitrarily large substrates by ultrasonic spraying. This scalable process is ideally suited for large-area, solution-based production of SWNT electrodes…
Screening nanorods coated with a mixture of SERS active molecules and biocompatible polymer identifies three formulations that may be uniquely distinguished in vivo over a spectral bandwidth of only 6 nm in the near-infrared (a spectral multiplexing density over an order of magnitude greater than attainable with semic…
Efficient quantum cutting by the Pr3+–Yb3+ couple is demonstrated for the conversion of blue/green to near-infrared (NIR) radiation with quantum efficiencies close to 200%. The resonant two-step energy transfer process, which involves one higher-energy photon becoming two NIR photons, may lead to the reduction of ener…
Abstract Ultilizing boron nitride nanotubes (BNNTs) as fillers, composites are fabricated with poly(methyl methacrylate), polystyrene, poly(vinyl butyral), or poly(ethylene vinyl alcohol) as the matrix and their thermal, electrical, and mechanical properties are evaluated. More than 20‐fold thermal conductivity improv…
A novel approach to functionalize graphene with large aromatic donor and acceptor molecules consisting of nanographene units is presented, producing an unprecedented class of graphene and nanographene composites with tunable electronic properties. The stability of aqueous dispersion of graphene sheets is greatly enhan…
Flexible, semi-transparent, and free-standing graphite oxide membranes are produced by a facile self-assembly process at the liquid/air interface, and the membranes are thickness controlled and area adjustable. Such macroscopic membranes are constructed from individual graphene oxide sheets by layer-by-layer stacking…
Abstract The conductivity of graphite oxide films is modulated using reducing agents. It is found that the sheet resistance of graphite oxide film reduced using sodium borohydride (NaBH 4 ) is much lower than that of films reduced using hydrazine (N 2 H 4 ). This is attributed to the formation of CN groups in the N 2…
Abstract Tuning perovskites! A dramatic structural control of magnetic properties is reported in Ba 0.7 Sr 0.3 Ru 1− x Mn x O 3 hexagonal perovskites. These are spin‐glasses with freezing temperatures proportional to x in the 6H polytype up to x ≈0.5, but show high temperature antiferromagnetism in 4H phases at high x…
Abstract Under the influence of heat intumescent paints with stoichiometric compositions decomposed to defined compounds: Ammonium polyphosphate degraded to polyphosphoric acid and ammonia. Polyphosphoric acid reacted with pentaerythritols and glycerol to cyclic phosphoric acid esters, which were identified as the blo…
Shine your light: Recent work in photocrystallography demonstrates a large photoinduced increase in the magnetic susceptibility of a solid, which is accompanied by significant changes in the bond lengths of the Nd-NC-Fe moiety (see picture; black are ground-state bond lengths in A, red are photoinduced bond lengths).
The active site of ss-galactosidase (E. coli) contains a Mg(2+) ion ligated by Glu-416, His-418 and Glu-461 plus three water molecules. A Na(+) ion binds nearby. To better understand the role of the active site Mg(2+) and its ligands, His-418 was substituted with Asn, Glu and Phe. The Asn-418 and Glu-418 variants coul…
Turing lead into gold: Hollow hybrid PbS(x)-Au nanostructures of about 10 nm in diameter were synthesized using a one-step reaction under mild experimental conditions. The redox reaction of gold precursors with PbS nanocrystals in the presence of dodecylamine leads to the hollow feature of hybrid nanostructures (see p…
Abstract Join the family : Nanographene and nanodiamond are new members of nanocarbons, which consist of nano‐sized hexagonal and tetrahedral networks, respectively. In contrast to other members of the nanocarbon family, such as fullerenes and carbon nanotubes, the edge or surface in nanographene or nonodiamond plays…
Mixed doubles: The dimeric complex [{Fe(tim)}(2)] (see structure, tim = 2,3,9,10-tetramethyl-1,4,8,11-tetraazacyclotetradeca-1,3,8,10-tetraene) represents an unprecedented complex containing an unsupported Fe-Fe bond. The crystal structure confirms the presence of reduced tim units, thus indicating ligand redox activi…
A number of bacterial collagen-like proteins with Gly as every third residue and a high Pro content have been observed to form stable triple-helical structures despite the absence of hydroxyproline (Hyp). Here, the high yield cold-shock expression system is used to obtain purified recombinant collagen-like protein (V-…
The ultimate miniaturization of electronic devices will likely require local and coherent control of single electronic wavefunctions. Wavefunctions exist within both physical real space and an abstract state space with a simple geometric interpretation: this state space--or Hilbert space--is spanned by mutually orthog…