Materials Literature
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A series of (hyper)branched poly( l -lactide)(PLLA) copolymers has been prepared by ring-opening multibranching copolymerization of l -lactide with a hydroxyl-functional (ABB′) lactone inimer, 5HDON (5-hydroxymethyl-1,4-dioxane-2-on). Polymerization was conducted in bulk and solution and catalyzed either by stanneous-…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTEffect of Degree of Branching on the Self-Assembly of Amphiphilic Hyperbranched Multiarm CopolymersHaixing Cheng†, Xijing Yuan†, Xiaoyi Sun†, Kunpeng Li‡, Yongfeng Zhou*†, and Deyue Yan*†View Author Information† School of Chemistry and Chemical Engineering, State Key Laboratory…
Archaea synthesize isopentenyl diphosphate (IPP) and dimethylallyl diphosphate (DMAPP), the essential building blocks of isoprenoid compounds, from mevalonate (MVA). However, an analysis of the genomes of several members of the Archaea failed to identify genes for the enzymes required to convert phosphomevalonate (PM)…
We report the high thermoelectric figure-of-merit (ZT) on the Se-deficient polycrystalline compounds of In4Se3−x (0.02≤x≤0.5) and the anisotropic electronic band structure. The Se-deficiency (x) has the effect of decreasing the semiconducting band gap and increasing the power factor. The band structure calculation for…
A highly sensitive method for the determination of gadolinium based MRI contrast agents in environmental water samples has been developed using hydrophilic interaction chromatography (HILIC) coupled with inductively coupled plasma mass spectrometry (ICP-MS). The contrast agents used in the present study are Gd-DTPA (M…
Abstract Hybrid nanocomposites of polypropylene/ultra‐high molecular weight polyethylene (PP/UHMWPE, 70/30) with various amounts of carbon black (CB) and carboxylated multiwalled carbon nanotubes (c‐MWNTs) were prepared by the solution mixing and melt blending techniques. The effects of the mixture of CB and c‐MWNTs o…
Thin films assembled from microgel building blocks have been constructed using a simple, high-throughput, and reproducible centrifugation (or "active") deposition technique. When compared to a common passive adsorption method (e.g., dip coating), microgels that are actively deposited onto a surface have smaller footpr…
Recent progress in developing statistical mechanical theories of supercooled polymer melts and glasses is reviewed. The focus is on those approaches that are either explicitly formulated for polymers, or are applications of more generic theories to interpret polymeric phenomena. These include two configurational entro…
We propose microfluidics as a useful platform for reconfigurable electromagnetic metamaterials. Microfluidic split-ring resonators (MF-SRRs) are fabricated inside a flexible elastomeric material by employing rapid prototyping. The transmission measurements performed for mercury-injected MF-SRR exhibits sharp magnetic…
There are concerns regarding the toxicity of nano-TiO2, but data are limited on the mechanism underlying oxidative damage to liver of mice. In order to further study these mechanisms of nano-TiO2 particles, nano-anatase TiO2 (5 nm) were injected into the abdominal cavity of ICR mice daily for 14 days and biochemical p…
The development of ultrasensitive and rapid methods for the detection of dipicolinic acid (DPA), a biomarker for bacterial spores including Bacillus anthracis, is increasingly important. This paper reports the results of an investigation of surface enhanced Raman spectroscopy (SERS) based ultrasensitive detection of D…
As the field of nanotechnology continues to grow, evaluating the cytotoxicity of nanoparticles is important in furthering their application within biomedicine. Here, we report the synthesis, characterization, and cytotoxicity of nanoparticles of different morphologies of yttrium oxide, a promising material for biologi…
We report the design and implementation of a vertical organic field effect transistor which is compatible with standard device fabrication technology and is well described by a self consistent device model. The active semiconductor is a film of C60 molecules, and the device operation is based on the architecture of th…
Using a tunneling-percolation model and Monte Carlo simulations, we study the resistivity of graphene-based nanocomposites as a function of both graphene sheet and device parameters. We observe an inverse power law dependence of resistivity on device dimensions and volume fraction near the percolation threshold, and f…
Hydrophobic plasticizer protects polylactide (PLA) against hydrolytic degradation but still migrates to aging medium and there undergoes further hydrolysis contributing to the spectrum of degradation products. PLA plasticized with hydrophobic acetyl tributyl citrate (ATC) plasticizer showed a slower degradation rate c…
The present study describes the antimicrobial activity of C-AuNp-Amp (chitosan-capped gold nanoparticles coupled with ampicillin). C-AuNp-Amp was synthesized using the wet precipitation method and characterized using FTIR (Fourier-transform IR) spectroscopy and AFM (atomic force microscopy) techniques. The optimal lev…
Polyethylene-based used plastics needs hundreds of years to degrade in atmospheric conditions. Thus, in addition to conventional recycling facilities for polymer waste (PW), innovative solutions are required. This paper describes a solvent-free process that converts PW such as low-density (LD) and high-density polyeth…
Several instrumental analyses, such as spectroscopic properties, luminescent intensity, nuclear magnetic resonance, X‐ray diffraction, electron spin resonance, X‐ray photoelectron spectroscopy, and extended X‐ray absorption fine structure, have been performed on a Bi 2 O 3 –Al 2 O 3 –SiO 2 glass system. After the role…
We study the phase behavior of systems of particles interacting through pair potentials with a hard core plus a soft repulsive component. We consider several different forms of soft repulsion, including a square shoulder, a linear ramp and a quasi-exponential tail. The common feature of these potentials is the presenc…
Drug delivery with precise spatial and temporal control is of broad current interest in biology and medicine. Despite recent advances achieved by combining drugs or drug carriers with NIR light responsive plasmonic nanomaterials, existing technologies are not capable of preventing drug leakage or degradation. We repor…