Materials

Preparation of a Bimetal Using Mechanical Alloying for Environmental or Industrial Use

This technology could be of use for catalyst production or environmental applications. Following the 1976 Toxic Substances Control Act ban on their manufacture, PCBs remain an environmental threat. PCBs are known to bio-accumulate and concentrate in fatty tissues. Further complications arise from the potential for contamination of commercial mixtures with other more toxic chlorinated compounds such as polychlorinated dibenzodioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs). Until recently, only one option was available for the treatment of PCB-contaminated materials: incineration. This may prove to be more detrimental to the environment than the PCBs themselves due to the potential for formation of PCDDs.

Posted in: Materials, Briefs

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Nano-Ceramic Coated Plastics

Adding this non-stick coating to cookware can create easy-to-clean plastic containers. Plastic products, due to their durability, safety, and low manufacturing cost, are now rapidly replacing cookware items traditionally made of glass and ceramics. Despite this trend, some still prefer relatively expensive and more fragile ceramic/glassware because plastics can deteriorate over time after exposure to foods, which can generate odors, bad appearance, and/or color change. Nano-ceramic coatings can eliminate these drawbacks while still retaining the advantages of the plastic, since the coating only alters the surface of the plastic. The surface coating adds functionality to the plastics such as self-cleaning and disinfectant capabilities that result from a photocatalytic effect of certain ceramic systems. These ceramic coatings can also provide non-stick surfaces and higher temperature capabilities for the base plastics without resorting to ceramic or glass materials.

Posted in: Materials, Briefs, TSP

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Fifty Years of Small Diameter High Quality Precision Tube Technology

Technology, applications, and materials evolve from analog meters to cutting edge medical devices. Over the past fifty years, thin wall small diameter precision metal tubing has undergone quite a transformation. From its use in the mid-1960s as pointers for analog meters, tubes have become essential components in the most cutting edge medical devices. To make that transition, precision tube companies have had to adapt to changing technology, applications, and materials.

Posted in: Bio-Medical, Manufacturing & Prototyping, Custom & Contract Manufacturing, Materials / Adhesives / Coatings, Materials, Metals, Medical, Briefs, MDB

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Manufacturing of Nanocomposite Carbon Fibers and Composite Cylinders

Pitch-based nanocomposite carbon fibers were prepared with various percentages of carbon nanofibers (CNFs), and the fibers were used for manufacturing composite structures. Experimental results show that these nanocomposite carbon fibers exhibit improved structural and electrical conductivity properties as compared to unreinforced carbon fibers. Composite panels fabricated from these nanocomposite carbon fibers and an epoxy system also show the same properties transformed from the fibers.

Posted in: Materials, Briefs

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Multi-scale CNT-Based Reinforcing Polymer Matrix Composites for Lightweight Structures

Applications include commercial aircraft, sports equipment, and automobiles. Reinforcing critical areas in carbon polymer matrix composites (PMCs), also known as fiber reinforced composites (FRCs), is advantageous for structural durability. Since carbon nanotubes (CNTs) have extremely high tensile strength, they can be used as a functional additive to enhance the mechanical properties of FRCs. However, CNTs are not readily dispersible in the polymer matrix, which leads to lower than theoretically predicted improvement in mechanical, thermal, and electrical properties of CNT composites. The inability to align CNTs in a polymer matrix is also a known issue. The feasibility of incorporating aligned CNTs into an FRC was demonstrated using a novel, yet commercially viable nanofiber approach, termed NRMs (nanofiberreinforcing mats). The NRM concept of reinforcement allows for a convenient and safe means of incorporating CNTs into FRC structural components specifically where they are needed during the fabrication process.

Posted in: Materials, Briefs

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Pt-Ni and Pt-Co Catalyst Synthesis Route for Fuel Cell Applications

The main objective is to increase the overall efficiencies of fuel cell systems to support power for manned lunar bases. Oxygen reduction reactions (ORRs) at the cathode are the rate-limiting step in fuel cell performance. The ORR is 100 times slower than the corresponding hydrogen oxidation at the anode. Speeding up the reaction at the cathode will improve fuel cell efficiency.

Posted in: Materials, Briefs, TSP

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Aerogel-Based Multilayer Insulation With Micrometeoroid Protection

The aerogel’s hydrophobic nature ensures thermal performance when exposed to the environment. Ultra-low-density, highly hydrophobic, fiber-reinforced aerogel material integrated with MLI (aluminized Mylar reflectors and B4A Dacron separators) offers a highly effective insulation package by providing unsurpassed thermal performance and significant robustness, delivering substantial MMOD protection via the addition of a novel, durable, external aerogel layer. The hydrophobic nature of the aerogel is an important property for maintaining thermal performance if the material is exposed to the environment (i.e. rain, snow, etc.) during ground installations.

Posted in: Materials, Briefs, TSP

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