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1.
Macromol Rapid Commun ; 39(4)2018 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-29210493

RESUMO

Silicone elastomers have broad versatility within a variety of potential advanced materials applications, such as soft robotics, biomedical devices, and metamaterials. A series of custom 3D printable silicone inks with tunable stiffness is developed, formulated, and characterized. The silicone inks exhibit excellent rheological behavior for 3D printing, as observed from the printing of porous structures with controlled architectures. Herein, the capability to tune the stiffness of printable silicone materials via careful control over the chemistry, network formation, and crosslink density of the ink formulations in order to overcome the challenging interplay between ink development, post-processing, material properties, and performance is demonstrated.


Assuntos
Materiais Biocompatíveis/química , Elastômeros/química , Silicones/química , Materiais Biocompatíveis/síntese química , Elastômeros/síntese química , Tinta , Porosidade , Impressão Tridimensional , Reologia , Silicones/síntese química
2.
ACS Appl Mater Interfaces ; 5(24): 13129-34, 2013 Dec 26.
Artigo em Inglês | MEDLINE | ID: mdl-24283629

RESUMO

A universal approach for on-demand development of monolithic metal oxide composite bulk materials with air-like densities (<5 mg/cm(3)) is reported. The materials are fabricated by atomic layer deposition of titania (TiO2) or zinc oxide (ZnO) using the nanoscale architecture of 1 mg/cm(3) SiO2 aerogels formed by self-organization as a blueprint. This approach provides deterministic control over density and composition without affecting the nanoscale architecture of the composite material that is otherwise very difficult to achieve. We found that these materials provide laser-to-X-ray conversion efficiencies of up to 5.3%, which is the highest conversion efficiency yet obtained from any foam-based target, thus opening the door to a new generation of highly efficient laser-induced nanosecond scale multi-keV X-ray sources.

3.
Anal Chem ; 75(8): 1924-30, 2003 Apr 15.
Artigo em Inglês | MEDLINE | ID: mdl-12713052

RESUMO

Liquid array-based multiplexed immunoassays designed for rapid, sensitive, specific, and simultaneous detection of multiple simulants of biological warfare agents have been developed. In both blind and standard laboratory trials, we demonstrate the simultaneous detection of four simulant agents from a single sample. The challenge agents comprise broad classes of pathogens (virus, protein toxins, bacterial spores, vegetative cells). Assay performance of each analyte was optimized, and dose-response curves and the limits of detection (LODs) for individual analytes are presented. Assay performance, including dynamic range, sensitivity, and LODs for liquid arrays and enzyme-linked immunosorbant assay were compared and are shown to be similar. Maximum assay sensitivity is obtained in approximately 1 h, and good sensitivity is achieved in as little as 30 min. Although the sample matrixes are very complex, even for highly multiplexed assays the samples do not exhibit evidence of nonspecific binding, demonstrating that the assays also have high specificity.


Assuntos
Guerra Biológica/prevenção & controle , Imunoensaio , Bactérias/isolamento & purificação , Guerra Biológica/métodos , Microesferas , Toxinas Biológicas/análise , Vírus/isolamento & purificação
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