MX2008007974A - Metal-containing nanowires prepared using mesoporous molecular sieves as templates, and their use in smoking articles - Google Patents

Abstract

Cut filler compositions, smoking articles such as cigarettes 2, methods for making cigarettes and methods for treating cigarette smoke are provided, which involve the use of metal-containing nanowires. The metal-containing nanowires are capable of removing at least one constituent from tobacco smoke, preferably in a selective manner. The metal-containing nanowires may comprise any suitable metal, metal oxide or mixtures thereof . For example, the metal-containing nanowires comprise at least one transition or lanthanide metal or metal oxide thereof . Exemplary metals or metal oxides thereof include, but are not limited to, iron, copper, zinc, titanium, vanadium, palladium, cobalt, molybdenum and manganese. The metal-containing nanowires may be produced by (i) loading at least one metal-containing composition into a mesoporous molecular sieve substrate via repeated incipient-wetness impregnation followed by stepwise calcination to form said nanowires;and (ii) isolating the nanowires by extracting the mesoporous molecular sieve substrate, e.g. , with aqueous NaOH.

Description

NANOALAM BRES CONTE NIEN DO M ETAL PREPARATIONS USAN DO MOLECULAR TOMICES M ESOPOROSOS AS PLANTI LLAS AND ITS USE IN ARTICLES ULOS FOR SMOKING BACKGROUND Certain filter materials have been suggested for incorporation into cigarette filters, including cotton, paper, cellulose and certain synthetic fibers. However, such filter materials generally only remove particulates and condensed components of tobacco smoke. In this way, they are usually not optimal for the removal of certain gaseous components to smoke tobacco, for example, volatile organic components. In light of this, a variety of additives has been proposed in the technique to complement the performance of filter materials. Despite developments to date, there is still an interest in developing improved and more efficient methods and compositions for removing certain constituents in mainstream tobacco smoke. Preferably, such methods and compositions should not involve expensive or slow manufacturing and / or processing steps. More preferably, such methods and compositions should be capable of selectively removing at least one constituent of mainstream tobacco smoke in the filter region of the cigarette and / or along the length of the cigarette during smoking. .

BRIEF DESCRIPTION OF THE NONDION Cutting, filter and paper filler compositions, smoking articles, such as cigarettes, and methods for making cigarettes and filters, which involve the use of metal-containing nanowires capable of removing at least one constituent of tobacco smoke, are provided. In one embodiment, the cut filler compositions are provided, which comprise tobacco, and metal-containing nanowires, wherein the metal-containing nanowires are capable of removing at least one constituent of tobacco smoke. In another embodiment, smoking articles are provided, which comprise metal-containing nanoalloys, wherein the metal-containing nanowires are capable of removing at least one constituent of tobacco smoke. Examples of smoking articles include, for example, cigarettes, pipes, cigars and other non-traditional cigarettes. The metal-containing nanowires can be dispersed in a cut filler, located in a paper wrapper and / or located in a filter portion of the smoking article. These smoking articles may preferably comprise up to about 200 mg of the metal-containing nanowires, preferably more than about 5 mg of the metal-containing nanowires. The filter for the smoking article can be a mono filter, a dual filter, a triple filter, a cavity filter, a depressed filter or a free flow filter. The metal-containing nanowires can be incorporated into one or more filter parts selected from the group consists of: set paper insert, a plug, a space, cigarette filter paper, a cellulose acetate sleeve, a polypropylene sleeve and a free flow sleeve. Preferably, the metal-containing nanowires are capable of selectively removing at least one constituent of smoke from the main stream. Examples of constituents that can be removed include, but are not limited to, aldehydes, carbon monoxide, 1,3-butadiene, isoprene, acrolein, acrylonitrile, hydrogen cyanide, o-toluid ina, 2-naphthylamine, nitrogen, benzene, N-nitrosonornicotine, phenol, catechol, benz (a) anthracene, benzo (a) pyrene and mixtures thereof. Preferably, the metal-containing nanowires are present in an amount effective to remove at least one constituent of mainstream tobacco smoke; for example, preferably at least about 30% or more preferably at least about 50% of at least one constituent can be removed from the mainstream tobacco smoke. The nanowires may be less than 500 nm in diameter, less than 1 00 nm in diameter, less than 5 nm in diameter and / or have an aspect ratio between about 1 00 to about 1000. The metal-containing nanowires can comprise any metal, metal oxide or mixtures of the same. adequate systems. For example, the metal-containing nanowires may comprise at least one transition metal or metal oxide thereof selected from one or more of a transition metal or lanthanide or an atom metalloid and memes of the same, for example, B, Al, Si, Ti, V, Mn, Fe, Co, Cu, Zn, Ge, Y, Zr, Nb, Mo, Ru, Rh, Pd, Ag, Ce , Hf, Ta, W, Re, I r, Pt and Au. Particularly preferred metals are iron, copper, zinc, titanium, vanadium, palladium, cobalt, molybdenum and / or magnesium. The metal-containing nanowires can be produced by (i) charging at least one metal-containing composition into a mesoporous molecular sieve substrate via one or more incipient moisture impregnation steps followed by calcination in steps to form said nanowires; and (ii) isolating the nanowires by removing the mesoporous molecular sieve substrate, for example, by extraction with a suitable etching solution. The mesoporous molecular sieve substrate preferably comprises pores having an average diameter from about 2 nm to about 30 nm (about 20 A to about 300 A). Examples of mesoporous molecular sieve substrates that can be used to synthesize metal-containing nanowires include MCM-41, MCM-48 and SBA-1, for example. In yet another embodiment, a method for making a cigarette comprises (i) adding an effective amount of at least one metal-containing nanowire to a cutting filler, wherein the metal-containing nano-wire is capable of removing at least one constituent of tobacco smoke.; (ii) providing the cutting filler comprising the metal-containing nanowire to a cigarette rolling machine to form a tacho column; and (iii) place a wrapping paper around the tobacco column to form a tobacco bar of a cigarette. In one embodiment, methods for making a cigarette are provided, which comprise (i) providing a cutting filler to a cigarette making machine to form a tobacco column; (ii) placing a paper wrap around the tobacco column to form a tobacco rod; and (iii) attaching a cigarette filter to a tobacco rod using tip paper to form the cigarette, wherein the cigarette filter comprises an effective amount of at least one nanowire containing metal capable of removing at least one constituent of the smoke. of mainstream tobacco. Another embodiment relates to methods for making a cigarette, comprising (i) providing the cutting filler to a cigarette making machine in order to form a tobacco column; and (ii) placing a paper wrap around the tobacco column to form a tobacco rod of a cigarette, wherein the paper wrapper comprises an effective amount of at least one nano metal containing metal capable of removing at least one cigarette. a constituent of side stream tobacco smoke. Another embodiment relates to methods for making a cigarette filter, which comprises incorporating an effective amount of at least one nanowire containing metal capable of removing at least one constituent of mainstream tobacco smoke in a cigarette filter. In another embodiment, a method is provided to treat mainstream smoke from a smoking article to remove at least one constituent of mainstream tobacco smoke.

BRIEF DESCRIPTION OF THE FIGURES Figure 1 is a partially schematic perspective view of a cigarette incorporating a modality, wherein the folded paper containing metal-containing nanowires is inserted into a hollow portion of a tubular filter element of the cigarette; Figure 2 is a partially schematic perspective view of another embodiment in which the metal-containing nanoamalles are incorporated in folded paper and inserted into a hollow portion of a first free-flowing sleeve of a tubular filter element adjacent to a second sleeve free of flow; Figure 3 is a partially schematic perspective view of another embodiment, wherein the metal-containing nanowires are incorporated in a plug-space-plug filter element; Figure 4 is a partially schematic perspective view of another embodiment, wherein the metal-containing nanowires are incorporated in a three-piece filter element having three plugs; Figure 5 is a partially schematic perspective view of another embodiment, wherein the metal-containing nanowires are incorporated in a four-piece filter element having a plug-space-plug arrangement and a hollow sleeve; Figure 6 is a partially schematic perspective view of another embodiment, wherein the metal-containing nanowires are incorporated in a three-part filter element having two plugs and a hollow sleeve; Figure 7 is a partially schematic perspective view of another embodiment, wherein the metal-containing nanowires are incorporated into a two-part filter element having two plugs; and Figure 8 is a partially schematic perspective view of another embodiment, wherein the metal-containing nanowires are incorporated into a filter element that can be used in a smoking article.

DETAILED DESCRIPTION Cutting, filter and paper filler compositions, smoking articles, such as cigarettes, methods for making cigarettes and methods for smoking cigarettes, which involve the use of metal-containing nano-metals to remove one or more constituents of the cigarette, are provided. Tobacco smoke mainstream and sidestream. The term "main stream" smoke refers to the mixture of gases that are emitted through the mouth or filter end of a smoking article, such as a cigarette, pipe, cigar or non-traditional cigarette, for example, the amount of smoke that is emitted or dragged from the mouth end of a cigarette during cigarette smoking.The metal-containing nanowires are used for seletive and effective removal of selected smoke constituents. mainstream tobacco. Preferably, other constituents in mainstream smoke, i.e., such as those which contribute to taste, will not be focused for removal. By "removed" it is meant that the concentration of at least some of at least one constituent in mainstream smoke is decreased. This can be achieved through a variety of mechanisms. For example, the constituent can react chemically with the metal-containing nanowires. Alternatively, the constituent can be adsorbed onto the surface of the nanowire containing metal, and thus can be removed from tobacco smoke before reaching the smoker or emitted as secondhand smoke. By "selective removal" it is meant that certain constituents are substantially removed from mainstream smoke, while other constituents are not substantially removed. The term "selective" also encompasses "l-preference" removal of certain mainstream smoke constituents, that is, where more than one constituent can be removed, but where one constituent is removed to a greater degree than another component. The nanowires used can be produced by any suitable technique. For example, nanowires can be formed by charging several solutions containing metal into a mesoporous molecular sieve substrate, which is subjected to one or more steps of incipient moisture impregnation followed by calcination in steps. The solutions containing meta l used for the impregnation of incipient moisture may comprise any suitable precursor and / or at least one metal ion. The solvent for the metal-containing solutions should be selected so as to facilitate impregnation in the pores of the mesoporous molecular sieves. Examples of suitable solvents include ethanol and / or water, for example.

Any suitable mesoporous molecular sieve substrate can be used to direct the synthesis of metal-containing nanowires. Exemplary materials are described, for example, in patents related to MCM-41, MC-48 and SBA-1 5; such as US patents nos. 5, 1 08,725; 5,098,684 and 5,162,643, all of which are incorporated herein by reference in their entirety. The diameter of the nanowires can be controlled through the selection of a mesoporous molecular sieve substrate having an appropriate average pore size and pore distribution. By selecting and using a meosoporous molecular sieve substrate with uniform dimensions, it is possible to form nanoa lamabres of very uniform dimensions. In addition, the final structure of the nanowires can be controlled by selecting a one-dimensional material to form a series of nanowires in parallel, or a three-dimensional material with interconnected pores to form an interconnected network of nanowires. The mesoporous silica can be obtained commercially, or synthesized using any suitable known or modified procedure. See, for example, D. Zhao, et al, Science, 279: 465 (1998) and Huang, M. H. et al. , Chem. Commun. , pp. 1 063-1 064 (2000). By For example, the mesoporous silica SBA-1 can be synthesized using copolymer copolymer of (poly) ethylene oxide-(poly) propylene oxide-(poly) ethylene oxide EO2oPO7oEO2O, as a template under acidic conditions. A solution comprising EO20PO70EO20: HCl 2M: TEOS: H2O in approximately a mass ratio of 2: 60: 4.25: 1 5 can be prepared and stirred for several hours at about 40 ° C, and then heated at 100 ° C overnight . The solid products can be filtered and calcined at 500 ° C for 5 hours. The samples can be analyzed, that is, using techniques such as transmission electron microscopy and / or low angle X-ray fractionation, to verify that they have the desired mesoporous structure, as well as any desired specification that refers to diameter, etc. In order to prepare nanowires, one or more steps of impregnation of incipient moisture, followed by calcination in steps, can be used. Mesoporous molecular sieve materials are soaked in a metal-containing solution to form a supersension, which is stirred at ambient temperatures for a sufficient time to allow the solution to penetrate the pores of the mesoporous molecular sieve materials. In a preferred modality, the suspension can be agitated for several hours at night. The suspension is then filtered, rinsed with deionized water and subjected to a calcination step under suitable conditions to decompose the solution containing impregnated metal to form wires. For example, the calcination step can be performed at temperatures between about 250 ° C to about 400 ° C under either an inert or ambient atmosphere Finally, the nanowires can be isolated by removing the surrounding molecular sieve substrate using a suitable etching solution. The metal-containing nanowires, as described above, can be provided along the length of a tobacco rod by distributing the metal-containing nanowires in the tobacco or incorporating the mixture into the cut-fill tobacco using any suitable method. The metal-containing wires can be provided in the form of a powder or in a solution in the form of a dispersion In a preferred method, the nano-metals containing metal in the form of a dry powder are powdered in the cut filler tobacco. The metal-containing nanowire may also be present in the the form of a solution and atomized in the cut filler tacho Alternatively, the taba Co can be coated with a solution containing the metal-containing nanowires. Metal-containing nozzles can also be added to the stock of cut filler tobacco provided to the cigarette making machine or added to a tobacco column before wrapping the cigarette paper. around the cigarette bar The metal-containing nanowires will preferably be distributed along the tobacco bar portion of a cigarette, the cigarette paper and / or the cigarette filter. When providing the metal-containing nanowires throughout from the tobacco bar In complete, it is possible to reduce the amount of carbon monoxide and / or nitric oxide throughout the cigarette, and in particular in the combustion region and in the pyrolysis zone. Any conventional or modified cigarette manufacturing technique can be used to incorporate metal-containing nanowires. The resulting cigarettes can be manufactured to any known specification using standard and modified cigarette manufacturing techniques and equipment. Normally, the cut filler composition is optionally combined with other cigarette additives, and a cigarette making machine is provided to produce a tobacco column, which is then wrapped in cigarette paper and optionally finished in a tip with filters. Any suitable tobacco mixture can be used for cutting filler. Examples of suitable types of tobacco materials include Burley, Maryland or Oriental tobaccos, smoke-cured, rare or specialty tobacco, and mixtures thereof. The tobacco material can be provided in the form of tobacco sheet; processed processing materials, such as inflated or expanded tobacco by volume, stems of processed tobacco, such as stems inflated with cut or rolled with cut, reconstituted tobacco materials; or mixtures thereof. The cut filler may also include tobacco substitutes. In a cigarette manufacture, tobacco is normally employed in the form of a cutting filler, ie, in the form of shreds or filaments cut into widths ranging from about% cm to about 1/8 cm (about 1/1 0 in to about 1/20 in) or even 1/1 6 cm (1/40 in). The lengths of the filaments vary from about 0.65 cm to about 7.6 cm (about 0.25 in. To about 3.0 in.). The cigarettes may additionally comprise one or more flavorings or other additives, for example, burnt additives, combustion modifying agents, coloring agents, binders, etc. The resulting cigarettes can be manufactured to any desired specification using standard or modified cigarette manufacturing techniques and equipment. The cigarettes can vary from about 50 mm to about 1 20 mm in length. "Smoking" a cigarette includes heating or combustion of the cigarette to form smoke and entrain the smoke through the smoking article. In general, smoking a cigarette involves lighting one end of the cigarette and dragging the cigarette smoke through the mouth end of the cigarette, while the tobacco contained therein experiences a combustion reaction. However, the cigarette can also be smoked by other methods. For example, the cigarette can be smoked by heating the cigarette and / or heating using an electric heater as described in commonly assigned US patents. 6.053, 1 76; 5,934,289; 5, 591, 368 or 5, 322, 075, for example.

Any conventional or modified method for making cigarette filters can be used to incorporate the metal-containing nanowires. For example, various cigarette filter arrays and methods for making filters are described in U.S. Pat. No. 6, 209, 547, which is incorporated herein in its entirety. Figure 1 illustrates a cigarette 2 having a tobacco rod 4, a filtering portion 6, and a nozzle filter plug 8. As shown, the metal-containing nanowires can be loaded onto paper folded 1 0 inserted into a cavity h ueca, such as the intrior of a free flow cuff 12 that forms part of the filter portion 6. Figure 2 shows a cigarette 2 having a tobacco rod 4 and a filter portion 6, wherein the folded paper 1 0 is located in the hollow cavity of a first smoke-free sleeve 1 3 located between the nozzle filter 8 and a second free flow sleeve 1 5. The paper 1 0 can be used in forms other than a folded sheet. For example, paper 10 may be displayed as one or more individual strips, a rolled roll, etc. In any form, a desired amount of the metal-containing nanowires may be provided in the cigarette filter portion by a combination of the reagent coated area / paper area and / or the total area of coated paper used in the sample. the filter (for example, greater amounts of metal-containing nanowires can be provided simply by using larger pieces of coated paper). In the cigarettes shown in Figures 1 and 2, the tobacco rod 4 and the filter portion 6 are bonded together with paper tip 1 4. In both cigarettes, the filter portion 6 can be held in place by filter overwrap 1 1. The metal-containing nanowires can be incorporated into the filter paper in a variety of ways. For example, metal-containing nanowires can be mixed with water to form a paste. The paste can then be coated on pre-formed filter paper and allowed to dry. The filter paper can then be incorporated into the filter portion of a cigarette in the manner shown in Figures 1 and 2. Alternatively, the dry paper can be wrapped in a plug form and inserted into a filter portion of the cigarette. . For example, the paper can be wrapped in a plug form and inserted as a plug into the interior of a free-flowing filter element, such as a polypropylene or cellulose acetate sleeve. In another arrangement, the paper may comprise an internal liner of such a flow-free filter element. Alternatively, the metal-containing nano-metals can be added to the filter paper or cigarette during the papermaking process. For example, metal-containing nanowires can be mixed with bulk cellulose to form a cellulose pulp blend. The mixture can then be formed into cigarette paper or filter according to any conventional or modified method. In another preferred embodiment, the metal-containing nanowires are incorporated into the fibrous material of the cigarette filter portion per se. Such filter materials include, but not are limited to fibrous filter materials including paper, such as toe paper or fiber plugs such as cellulose acetate fibers and polypropylene fibers. This embodiment is illustrated in Figure 3, which shows a cigarette 2 comprised of a tobacco rod 4 and a filter portion 6 in the form of a plug-space-plug filter having a bulb filter 8, a plug 1 6 and a space 1 8. The plug 1 6 may comprise a tube or solid piece of material l such as cellulose acetate or polypropylene fibers. The tobacco rod 4 and the filter portion 6 are joined together with tip paper 1 4. The filter portion 6 can include a filter overwrap 1. The filter overwrap 1 1 containing traditional fibrous filter material and metal-containing nanowires can be incorporated in or on the filter overwrap 1 1, such as when coated thereon. Alternatively, the metal-containing nanowires can be incorporated into the nozzle filter 8, plug 1 6 and / or space 1 8. Furthermore, the metal-containing nanowires can be incorporated into any portion element. of a cigarette filter. For example, the filter portion may consist only of the nozzle filter 8 and metal-containing nanowires may be incorporated in the nozzle filter 8 and / or the tip paper 1 4. FIG. 4 shows a cigarette 2 included in FIG. by a tobacco rod 4 and filter portion 6. This arrangement is similar to that of Figure 3, except that space 1 8 is filled with nanowire granules containing metal or a plug 1 5 made of material, such as acetate. cellulose or fibrous polypropylene containing nanowires containing metal. As in the previous embodiment, the plug 16 can be hollow or solid and the tobacco rod 4 and filter portion 6 are n joined together with the tip paper 1 4. There is also a filter overwrap 1 1. Figure 5 shows a cigarette 2 comprised of a tobacco rod 4 and a filter portion 6, wherein the filter portion 6 includes a nozzle filter 8, a filter overwrap 1 1, tip paper 1 4 for attaching the tobacco rod 4 and the filter portion 6, a space 1 8, a plug 1 6 and a hollow sleeve 20. The metal-containing nanowires can be incorporated in one or more elements of the filter portion 6. For example, The metal-containing nanowires can be incorporated into the sleeve 20 or nanoa granules containing metal can be filled in the space within the sleeve. If desired, the plug 1 6 and the sleeve 20 can be made of material such as cellulose acetate or fibrous polypropylene containing metal-containing nanowires. As in the previous embodiment, the plug 1 6 can be hollow or solid. Figures 6 and 7 show additional modifications of the filter portion 6. In Figure 6, the cigarette 2 is comprised of a tobacco rod 4 and filter portion 6. The filter portion 6 includes a fuel filter. 8, a filter overwrap 1 1, a plug 22 and a sleeve 20 and metal-containing nanowires can be incorporated into one or more of these filter elements. In Fig. 7, the filter portion 6 includes a nozzle filter 8 and a plug 24, and metal-containing nanowires can be incorporated into one or more of these filter elements. Like plug 1 6, taps 22 and 24 can be solid or hollow. In the cigarettes shown in Figures 6 and 7, the tobacco rod 4 and the filter portion 6 are annealed together by tip paper. 4. Various techniques can be used to apply nano-metal containing metals to filter fibers. other substrate supports. For example, metal-containing nanowires can be added to the filter fibers before they are formed in a filter cartridge, for example, a cigarette tip. Metal-containing nano-metals can be added to filter fibers, for example, in the form of a dry powder or a paste. If the metal-containing nanowires are applied in the form of a paste, the fibers are allowed to dry before they form in a filter cartridge. In another preferred embodiment, the metal-containing nanowires are employed in a hollow portion of a rye filter. For example, some cigarette filters have a plug / space / plug configuration, in which the plugs comprise a fibrous filter material and the space is simply a gap between the two filter plugs. That gap can be filled with nanoa lameres containing metal. An example of this embodiment is shown in Figure 3. The metal-containing nanowires may be in gumular form or may be loaded on a suitable support, such as a fiber or filament. In another embodiment, metal-containing nanowires are used in a filter portion of a cigarette to be used with a smoking device as described in the commonly assigned US patent no. 5,692,525, the entire contents of which are incorporated herein by reference. Figure 8 illustrates a type of construction of a cigarette 10, which can be used with an electric smoking device. As shown, the cigarette 1 00 includes a tobacco rod 60 and a filter portion 62 disposed by tip paper 64. The filter portion 62 preferably contains a tubular free flow filter element 1 02 and a stopper of filter filter 1 04. Flow-free filter element 1 02 and fuel filter plug 1 04 can be attached as a combined plug 1 1 0 with plug wrap 1 1 2. The tobacco rod 60 can have several forms that incorporate one or more of the following articles: an overwrap 71, another tubular free flow filter element 74, an indigo cylindrical plug 80 preferably wrapped in a plug wrapper 84, a tobacco web 66 that Component comprises a base 68 pattern and tobacco flavor material 70 and a hollow space 91. The free flow filter element 74 provides structural definition and support at the tipped end 72 of the tobacco rod 60. At the free end 78 of the tobacco rod 60, the tobacco web 66 together with the overwrap 71 are wrapped around the cylindrical cork stopper 80. Various modifications can be made to a filter arrangement for such a cigarette incorporating the metal-containing nanowires. In such a cigarette, the metal-containing nanowires can be incorporated in various ways, such as when loaded onto paper or other substrate material that is adjusted in the passage of the metal element. free flow filter 1 02 in it. The metal-containing nanowires can also be deployed as a liner or a plug inside the tubular free flow filter element 1 02. Alternatively, metal containing nanowires can be incorporated into the fibrous wall portions of the tubing element. tubular free flow filter 1 02 by itself. For example, the tubular flow free filter element or sleeve 1 02 can be made of suitable materials, such as cellulose acetate or polypropylene fibers and the metal-containing nanowires can be mixed with such fibers prior to or as part of the forming process. sleeve. As explained above, the metal-containing nanowires can be incorporated into various support materials. When the metal-containing nanowires are used in filter paper, the metal-containing nanowires can be incorporated into support particles having an average particle size of up to 1 00 μm, preferably less than 30 μm. When the metal-containing nanowires are used in granular form, larger support particles can be used. Such support particles preferably have a mesh size from 1 8 mesh to 60 (1 000 to 250 mers, US standard, ASTM E 1 1). To form such particles, larger particles of agglomerated material may break into smaller particles having a desired size by any suitable technique, such as milling. The smallest particles can be separated to produce a range of particle size desired by any suitable technique, such as sieving. Although the invention has been described with reference to the preferred embodiments, it will be understood that variations and modifications may be frequented as will be apparent to those skilled in the art. Such variations and modifications will be considered within the scope and scope of the invention as defined by the appended claims thereto. All of the aforementioned references are hereby incorporated by reference in their entirety to the same extent as if each individual reference were indicated specifically and individually as incorporated herein by reference in its entirety.

Claims (1)

1. CLAIMS A cut filler composition comprising tobacco and nanowires containing metal, wherein the metal-containing nanowires are capable of removing at least one constituent of tobacco smoke, and the nanowires comprise a metal, a metal oxide or mixtures thereof A cutting filler composition according to claim 1, wherein the at least one constituent is selected from the group consisting of aldehydes, carbon monoxide, 1,3-butadiene, isoprene, acrolein, acplonitplo, hydrogen cyanide, o-toluidine, 2-naphthalamine, nitrogen oxide, benzene, N-nitrosonornicotma, phenol, catechol, benz (a) anthracene, benzo (a) p-rene, and mixtures thereof, and the nanowires containing metal are present in an effective amount to remove at least about 30% of at least one mainstream smoke constituent 3 A cutting filler composition according to claim 1, wherein the nanowires are men Ores that are 100 nm in diameter or the nanowires are less than 5 nm in diameter A cut filler composition according to claim 1, wherein the metal-containing nanowires comprise at least one transition metal or lanthanide or metal oxide thereof. A cut filler composition in accordance with claim 1, wherein the metal-containing nanowires comprise at least one metal or metal oxide selected from the group consisting of iron, copper, zinc, titanium, vanadium, palladium, cobalt, molybdenum and manganese. 6. A cut filler composition according to claim 1, wherein the nanowires are produced by: (i) charging at least one composition containing metal into a mesoporous molecular sieve substrate via repeated incipient moisture impregnation followed by calcination in steps to form said nanofatters; and (ii) isolating the nanowires by extracting the mesoporous molecular sieve substrate. 7. A smoking article comprising metal-containing nano-metals, wherein the metal-containing nanowires are capable of removing at least one constituent of tobacco smoke and the nanowires comprise a metal, a metal oxide or mixtures thereof. 8. A smoking article according to claim 7, wherein the metal-containing nano-metals are located in a cut filler, a paper wrapper and / or a filter portion. 9. A smoking article according to claim 7, wherein the metal-containing nanoalloys are incorporated in one or more filter portions selected from the group consisting of: configured paper insert, a plug, a space, Cigarette filter paper, a cellulose acetate sleeve, a polypropylene sleeve and a free flow cuff. 1. A method for making an article for smoking according to claim 7, the method comprising: (i) providing a cutting filler to a cigarette making machine to form a tobacco column; (ii) placing a paper wrap around the tobacco column; and (i¡¡) attaching a cigarette filter to the tobacco rod using tip paper to form a cigarette, wherein at least the cigarette filter or the cut filler or the paper wrapper comprises an effective amount of nanowires. containing metal capable of removing at least one constituent of main stream tobacco smoke. SUMMARY Cutting filler compositions, smoking articles such as cigarettes 2, methods for making cigarettes and methods for treating cigarette smoke, which involve the use of metal-containing nanowires, are provided. The metal-containing nanowires are capable of removing at least one constituent of tobacco smoke, preferably in a selective manner. The metal-containing nanowires can comprise any suitable metal, metal oxide or mixtures thereof. For example, the metal-containing nanowires comprise at least one transition metal or lanthanide or metal oxide thereof. Metals or metal oxides of the same examples include, but are not limited to, iron, copper, zinc, titanium, vanadium, palladium, cobalt, molybdenum and manganese. The metal-containing nanowires can be produced by (i) charging at least one metal-containing composition into a mesoporous molecular sieve substrate via repeated incipient moisture impregnation followed by calcination in steps to form said nanowires; and (i) isolating the nanowires by extracting the mesoporous molecular sieve substrate, for example, with aqueous NaOH.