Healing with medical implants: The body battles back
Disease or inflammation can have substantial impact on biomaterials performance and the loosely defined term "biocompatibility" (Oliva et al., this issue).
Materials Literature
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Large-Area Patterning of Polyaniline Film Based on in Situ Self-Wrinkling and Its Reversible Doping/Dedoping Tunability
Here we report a simple one-pot yet robust approach to fabricate large-scale wrinkle patterns with reversible acid-doping/base-dedoping tunability. A novel swelling-induced self-wrinkling mechanism is responsible for the in situ growth of wrinkled polyaniline (PANI) film on polydimethylsiloxane (PDMS) substrate. The s…
Oligo(p‐phenyleneethynylene) (OPE) Molecular Wires: Synthesis and Length Dependence of Photoinduced Charge Transfer in OPEs with Triarylamine and Diaryloxadiazole End Groups
The systematic synthesis and photophysical, electrochemical and computational studies on an extended series of triphenylamine-[C≡C-1,4-C6H2(OR)2]n-C≡C-diphenyl-1,3,4-oxadiazole dyad molecules (the OR groups are at 2,5-positions of the para-phenylene ring and R = C6H13; n = 0-5, compounds 1, 2, 3, 4 and 5, respectively…
Total Ionizing Dose Effects on Silicon Ring Resonators
The performance of silicon ring resonators exposed to 10-keV X-ray and 662-keV gamma radiation is reported. Unpassivated rings having no native oxide exhibit a blue-shift in resonance wavelength with increasing total dose, which is attributed to surface oxidation that is accelerated in the presence of high energy radi…
Nafion-Modified MoOxas Effective Room-Temperature Hole Injection Layer for Stable, High-Performance Inverted Organic Solar Cells
We present a hole injection layer processed from solution at room temperature for inverted organic solar cells. Bis(2,4-pentanedionato) molybdenum(VI) dioxide (MoO2(acac)2) is used as the precursor for MoOx. Small amounts of Nafion in the precursor solution allow it to form continuous films with good wetting onto the…
Insights into the Conformations of Three Structurally Diverse Proteins: Cytochrome c , p53, and MDM2, Provided by Variable-Temperature Ion Mobility Mass Spectrometry
Thermally induced conformational transitions of three proteins of increasing intrinsic disorder-cytochrome c, the tumor suppressor protein p53 DNA binding domain (p53 DBD), and the N-terminus of the oncoprotein murine double minute 2 (NT-MDM2)-have been studied by native mass spectrometry and variable-temperature drif…
Integrating Structural and Thermodynamic Mechanisms for Sorption of PCBs by Montmorillonite
Strong sorption of planar nonionic organic chemicals by clay minerals has been observed for important classes of organic contaminants including polyaromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), and dioxins, and such affinity was hypothesized to relate to the interlayer hydrophobicity of smectite clay…
Spin and orbital magnetic response on the surface of a topological insulator
Coupling of the spin and orbital degrees of freedom on the surface of a strong three-dimensional insulator, on the one hand, and textured magnetic configuration in an adjacent ferromagnetic film, on the other, is studied using a combination of transport and thermodynamic considerations. Expressing exchange coupling be…
Directional excitation of graphene surface plasmons
We propose a scheme to directionally couple light into graphene plasmons by placing a graphene sheet on a magneto-optical substrate. When a magnetic field is applied parallel to the surface, the graphene plasmon dispersion relation becomes asymmetric in the forward and backward directions. It is possible to achieve un…
Hydroisomerization of Long Chain n -Paraffins over Pt/ZSM-22: Influence of Si/Al Ratio
Hydroisomerization of n -hexadecane has been investigated over ZSM-22 framework by varying bulk molar Si/Al ratio in the range from 30 to 90 at constant platinum loading of about 0.45 wt %. Thus, ZSM-22 samples have been synthesized and characterized with respect to their crystallinity, textural parameters, and total…
Predicting the excess solubility of acetanilide, acetaminophen, phenacetin, benzocaine, and caffeine in binary water/ethanol mixtures via molecular simulation
We present a general framework to predict the excess solubility of small molecular solids (such as pharmaceutical solids) in binary solvents via molecular simulation free energy calculations at infinite dilution with conventional molecular models. The present study used molecular dynamics with the General AMBER Force…
Distinguishing the Interactions in the Fructose 1,6-Bisphosphate Binding Site of Human Liver Pyruvate Kinase That Contribute to Allostery
In the study of allosteric proteins, understanding which effector-protein interactions contribute to allosteric activation is important both for designing allosteric drugs and for understanding allosteric mechanisms. The antihyperglycemic target, human liver pyruvate kinase (hL-PYK), binds its allosteric activator, fr…
The Electronic Factor in Alkane Oxidation Catalysis
This article addresses the fundamental question of whether concepts from semiconductor physics can be applied to describe the working mode of heterogeneous oxidation catalysts and whether they can be even used to discriminate between selective and unselective reaction pathways. Near-ambient-pressure X-ray photoelectro…
Biodegradation of low density polyethylene (LDPE) by a new biosurfactant-producing thermophilic Streptomyces coelicoflavus NBRC 15399T
In the present study, we tested 83 actinomycete isolates for low density polyethylene (LDPE) degradation in the laboratory, and these isolates were previously isolated for biosurfactant production from the oil contaminated soil sample near Naval Dockyard in Visakhapatnam. Among them, 20 were positive using 2,3,5-triph…
Fluorosurfactants‐Directed Preparation of Homogeneous and Hierarchical‐Porosity CMP Aerogels for Gas Sorption and Oil Cleanup
Homogeneous, hierarchical-porosity and highly hydrophobic conjugated microporous polymer (CMP) aerogels are facilely prepared assisted by fluorosurfactants. The fluorosurfactants show several roles in controlling the gelation process, modulating pore structures, and raising the hydrophobicity of materials, thus giving…
M13 Virus-Enabled Synthesis of Titanium Dioxide Nanowires for Tunable Mesoporous Semiconducting Networks
Mesoporous semiconducting networks exhibit advantageous photoelectrochemical properties. The M13 virus is a versatile biological scaffold that has been genetically engineered to organize various materials into nanowire (NW)-based mesoporous structures. In this study, high-aspect ratio titanium dioxide NWs are synthesi…
Experimental evidence of excited electron number density and temperature effects on electron-phonon coupling in gold films
The electronic transport properties of metals with weak electron-phonon coupling can be influenced by non-thermal electrons. Relaxation processes involving non-thermal electrons competing with the thermalized electron system have led to inconsistencies in the understanding of how electrons scatter and relax with the l…
Solvent Templates Induced Porous Metal–Organic Materials: Conformational Isomerism and Catalytic Activity
Solvent templates induced Co-based metal-organic materials; conformational isomers {[Co2(pdpa)(CH3CN)(H2O)3]·CH3OH·H2O}n (1) and {[Co2(pdpa)(CH3CN)(H2O)3]}n (2) and {[Co5(pdpa)2(μ3-OH)2(H2O)6]·2H2O}n (3) [H4pdpa = 5,5'-(pentane-1,2-diyl)-bis(oxy)diisophthalic acid] were synthesized under the same solvothermal conditio…
Quantitative Biophysical Characterization of Intrinsically Disordered Proteins
Intrinsically disordered proteins (IDPs) are broadly defined as protein regions that do not cooperatively fold into a spatially or temporally stable structure. Recent research strongly supports the hypothesis that a conserved functional role for structural disorder renders IDPs uniquely capable of functioning in biolo…
Design of Aromatic Helical Polymers for STM Visualization: Imaging of Single and Double Helices with a Pattern of π–π Stacking
From scanning tunneling microscopy (STM) images of rationally designed helical polymers with a pattern of π-π stacking, we successfully identified the single- and double-helical superstructures. The STM images of the helical structures revealed the smallest helical architecture (diameter ca. 1.3 nm) that has been seen…