摘要:
Exemplary embodiments provide methodologies for generating structures of filamentous carbon (or carbon filaments) with controlled geometries. In one exemplary embodiment of forming the carbon filament structure, a metal template can be exposed to a fuel rich gaseous mixture to form a carbon filament structure at an appropriate gas flow and/or at an appropriate temperature on the metal template. The metal template can have one or more metal surfaces with controlled geometries. Carbon filament structures can then be grown on the metal surfaces having corresponding geometries (or shapes) in the growth direction. The carbon filament structure can be two or three dimensional and can have high density. In various embodiments, the metal template can be removed to leave a self-supporting carbon filament structure.
摘要:
The configuration of a feedstock material is controlled by bringing it into contact with at least a first gas moving against it at a location with an area and thickness of the feedstock liquid that forms drops or fibers of a selected size. In one embodiment, drops of agricultural input materials are formed for spraying on agricultural fields. In another embodiment, nanofibers of materials such as chitosan or metals are formed. In another embodiment seeds are planted with gel. In another embodiment particles carrying desired agricultural inputs with modified release characteristics are delivered.
摘要:
The configuration of a feedstock material is controlled by bringing it into contact with at least a first gas moving against it at a location with an area and thickness of the feedstock liquid that forms drops or fibers of a selected size. In one embodiment, drops of agricultural input materials are formed for spraying on agricultural fields. In another embodiment, nanofibers of materials such as chitosan or metals are formed. In another embodiment seeds are planted with gel. In another embodiment particles carrying desired agricultural inputs with modified release characteristics are delivered.
摘要:
A method (10) for making a thread includes the steps of: mixing a polymer material and a solvent to form a solution (11); providing a liquid containing polar molecules, the liquid being insoluble in the solution (12); adding the solution to the liquid to form a solution film on a surface of the liquid (13); and applying an apparatus having a tip to the solution film for drawing out a thread therefrom (14). The solution can further contain an additive for improving one or more properties of the thread. The additive can be selected from nano-materials, for example, carbon nanotubes. The liquid containing polar molecules is water, or a solution having water as a solvent. The tip of the apparatus is needle-shaped.
摘要:
The invention concerns a method for reforming composite fibres comprising colloidal particles and at least a binding and/or crosslinking polymer, characterised in that it comprises: means for deforming, by cold process at room temperature or at a temperature slightly higher than room temperature, said polymer of said fibre, and means for applying, on said fibre, mechanical stresses.
摘要:
Solutions of intermediate molecular weight polymers from about 200,000 to about 4,000,000, such as polyethylene, in a relatively non-volatile solvent are extruded through an aperature at constant concentration and thereafter stretched at a ratio of at least about 3:1 prior to cooling to form a first gel. The first gels are extracted with a volatile solvent to form a second gel, and the second gel is dried to form a low porosity xerogel. Stretching occurs with any one or more of the first gel, second gel or xerogel. The polyethylene products produced by our process include products having a molecular weight between about 200,000 and about 4,000,000 a tenacity of at least about 13 grams/denier, a modulus of at least about 350 gram/denier, a porosity of less than 10% by volume, a crystalline orientation function of at least about 0.95, and a main melting temperature of at least about 140.degree. C.
摘要:
This invention provides for a continuous PTFE fiber having on its surface a substantially round profile and a single spiralling seam formed from a continuous sheet of polytetrafluoroethylene which is helically rolled and self-adhered. The PTFE sheet may include microporous PTFE as well as expanded microporous PTFE. The PTFE sheet may be filled with particulate fillers or coated with polymeric coatings prior to the formation of the inventive fiber. The PTFE sheet may be used to contain various filamentary or sheet-like elements with the inventive fiber.The method for producing the inventive fiber is also disclosed.
摘要:
Monofilaments are made from films of unoriented, polymeric resin thermoplastics. The method comprises providing strips or tapes of the unoriented films, twisting the tapes into a generally cylindrical cross-section and drawing the twisted tape to obtain an oriented, round-in-cross-section, monofilament. In the preferred embodiment, molding is carried out by drawing down the twisted tape.
摘要:
A method of producing threads and fibers of synthetic materials uses a cylindrically-shaped body of the synthetic material which is allowed to rotate against a scratching tool and a peeling knife arranged to follow the scratching tool in the direction of rotation. The peeled-off curtain of parallel threads is stretched, possibly while being simultaneously heated, and possibly the threads are cut to form a staple fiber or are ground to a short-staple floccule. A device for carrying out the aforementioned method, has a turning mechanism, a foil-peeling knife secured to a carriage of the turning mechanism, and a scratching tool arranged to precede the peeling knife.
摘要:
NOVEL COMPOSITE YARN IS PRODUCED WHICH COMPRISES A CONTINUOUS POLYMER SUBSTRATE CONSTITUENT COMBINED WITH FIBRIDS WHICH ARE EMBEDDED WITHIN THE POLYMER SUBSTRATE AND CONSOLIDATED THEREWITH; THESE FIBRIDS GENERALLY PROTRUDE OUTWARDLY FROM THE POLYMER SUBSTRATE CONSITUENT IN THE FORM OF FILAMENTOUS UNITS HAVING AN AVERAGE LENGTH OF FROM 1/8 TO 1/2 INCH AND A FINENESS OF BETWEEN 0.2 AND 1 DENIER AS WELLL AS A CHARACTERISTIC SPECIFIC SURFACE ABOVE 2 M.2/G; THEY IMPART TO THE COMPOSITE YARN A FIBROUS SURFACE TEXTURE; THIS NOVEL YARN IS PRODUCED BY A PROCESS GENERALLY INVOLVING EXTRUSION OF THE POLYMER SUBSTRATE AND COMBINATION AS WELL AS CONSOLIDATION OF THE EXTRUDED SUBSTRATE WITH THE FIBRID UNITS THROUGH PRESSURE AND COOLING.