Cámara de cianocrilato para la exploración lofoscópica-Cyanoacrylate chamber for lophoscopic exploration by diegoandrescantor@gmail.com

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    Cámara de cianocrilato para la exploración lofoscópica

    Cyanoacrylate chamber for lophoscopic exploration

    Diego A. Cantor (diegoandrescantor@gmail.com)

    Universidad Interamericana de Puerto Rico — Recinto Metro Inter American University of Puerto Rico — Metro Campus

    Asociación de Estudiantes de Química, Inter Metro

     

     

    Cyanoacrylates are a family of strong fast-acting adhesives with industrial, forensic, medical, and household uses. Cyanoacrylate adhesives have a short shelf life if not used, about one year from manufacture if unopened, one month once opened. They have some minor toxicity. Cyanoacrylates include

    methyl 2-cyanoacrylate, ethyl-2-cyanoacrylate (commonly sold under trade names such as "Super Glue" and "Krazy Glue"), n-butyl cyanoacrylate and
    2-octyl cyanoacrylate (used in medical, veterinary and first aid applications). Octyl cyanoacrylate was developed to address toxicity concerns and to reduce skin irritation and allergic response. Cyanoacrylate adhesives are sometimes known generically as instant glues, power glues or superglues (although "Super Glue" is a trade name). The abbreviation "CA" is commonly used for industrial grades.

     

     

    Introducción

    El cianocrilato es un reactivo químico que se usa para detectar huellas dactilares. Fue descubierto en el 1982 por del U.S. Army Criminal Investigation Laboratory en Japon (Laboratorio deinvestigadores Investigación Criminalística del Ejército de los Estados Unidos con base en Japón) y la Oficina para el Control de Bebidas Alcohólicas, Tabaco y Armas de Fuego.

     

     

    Una de las características más importantes de este revelador es que al reaccionar con los aminoácidos que provienen de la transpiración los plastificará, dando como resultado la fijación permanente de todos los detalles de las crestas y surcos interpapilares de la huella. La lofoscopía es el estudio de revelar huellas casi en cualquier tipo de superficie satinada.

     

     

    También es usado frecuentemente en el revelado de huellas existentes sobre la piel humana, en casos como de agresión sexual.

    Forma de utilizarse:

    Para mayores resultados la muestra a examinar, se tendrá que colocar dentro de una cámara hermética, que contenga los vapores liberados del pegamento, y es lo más ideal teniendo en cuenta que es un producto toxico.

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    Fuente:

    “Cianocrilato. Revelador químico de huellas dactilares

    (http://bit.ly/2dPeFiu)

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    Los vapores que emana este reactivo son utilizados para revelar huellas en superficies como:

     

     

    “Exploración Lofoscópica”

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    Cyanoacrylate is used as a forensic tool to capture latent fingerprints on non-porous surfaces like glass, plasDc, etc.[9] Cyanoacrylate is warmed to produce fumes that react with the invisible fingerprint residues and atmospheric moisture to form a white polymer (polycyanoacrylate) on the fingerprint ridges. The ridges can then be recorded.

    The developed fingerprints are, on most surfaces (except on white plasDc or similar), visible to the naked eye. Invisible or poorly visible prints can be further enhanced by applying a luminescent or non- luminescent stain.

     

     

    Behaviors

    Cyanoacrylates are mainly used as adhesives. They require some care and knowledge for effective use: they do not bond some materials; their shelf life at room temperature is about 12 months unopened and one month once opened; they do not fill spaces, unlike epoxies, and a very thin layer bonds more effectively than a thicker one that does not cure properly; they bond many substances, including human skin and tissues. They have an exothermic reaction to natural fibers: cotton, wool, leather, see reaction with cotton below. Cyanoacrylate glue has a low shearing strength, which has led to its use as a temporary adhesive in cases where the piece needs to be sheared off later. Common examples include mounting a work piece to a sacrificial glue block on a lathe, and tightening pins and bolts. It is also used in conjunction with another, slower, but more resilient adhesive as way of rapidly forming a joint, which then holds the pieces in the appropriate configuration until the second adhesive has set.

    Cyanoacrylate is not resistant to friction if applied to a smooth surface. Using either sugar or sandpaper can remove a good amount of cyanoacrylate from a user's fingertips.