{"id":507,"date":"2021-09-14T07:32:02","date_gmt":"2021-09-14T07:32:02","guid":{"rendered":"https:\/\/foodsafety.upb.ro\/?page_id=507"},"modified":"2021-11-29T09:06:14","modified_gmt":"2021-11-29T09:06:14","slug":"laboratorul-de-caracterizare-coloizi","status":"publish","type":"page","link":"https:\/\/foodsafety.upb.ro\/en\/laboratorul-de-caracterizare-coloizi\/","title":{"rendered":"Colloid characterization laboratory"},"content":{"rendered":"\t\t
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\n\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\tAnalizor dimensiune nanoparticule \u0219i poten\u021bial zeta<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t
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\n\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\tEchipament analiz\u0103 suprafa\u021b\u0103 \u2013 BET<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t
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\n\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\tNum\u0103r\u0103tor de particule \u0219i celule<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Analizor dimensiune nanoparticule \u0219i poten\u021bial zeta<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Determinarea are la baz\u0103 o tehnologie neinvaziv\u0103 bazat\u0103 pe difuzia dinamic\u0103 a luminii (DLS) emis\u0103 de un laser. Particula asimilat\u0103 cu o sfer\u0103 se afl\u0103 \u00een deplasare constant\u0103 datorit\u0103 mi\u0219c\u0103rii browniene ca urmare a ciocnirilor statistice cu moleculele de lichid. \u00cen aceast\u0103 mi\u0219care, particulele mici se vor mi\u0219ca mai rapid dec\u00e2t particulele mari.\u00a0<\/span><\/p>

Distribu\u0163ia m\u0103rimii particulelor ob\u0163inute prin DLS este func\u0163ie de intensitatea relativ\u0103 a luminii \u00eempr\u0103stiat\u0103 de particule de diferite clase dimensionale. Se m\u0103soar\u0103 dependen\u0163a de timp a fluctua\u0163iilor intensit\u0103\u0163ilor pentru determinarea coeficientului de difuzie transla\u0163ional (D), respectiv diametrul hidrodinamic (D<\/span>H<\/span>). Rezultatul constituie o distribu\u0163ie a intensitatii care poate fi convertit\u0103 \u00eentr-o distribu\u021bie de volum sau mas\u0103 dac\u0103 propriet\u0103\u0163ile optice ale particulelor sunt cunoscute (Teoria Mie).\u00a0<\/span><\/p>

Teoria Mie permite un calcul riguros al distribu\u0163iei m\u0103rimii particulelor din date de difrac\u0163ie laser, \u00eens\u0103 acest\u0103 predic\u0163ie a m\u0103rimii tuturor particulelor, mici sau mari, transparente sau opace, este condi\u021bionat\u0103 de urm\u0103toarele aproxim\u0103ri:<\/span><\/p>

– Particulele ce urmeaz\u0103 a fi m\u0103surate sunt sferice.<\/span><\/p>

– Suspensia de particule este diluat\u0103.<\/span><\/p>

– Propriet\u0103\u021bile optice ale particulelor \u015fi ale mediului \u00eenconjur\u0103tor sunt cunoscute.<\/span><\/p>

– Particulele sunt omogene.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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Echipament analiz\u0103 suprafa\u021b\u0103 \u2013 BET<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Sistemul de porozimetre cu gaz (Horiba SA 9600) ofer\u0103 o alternativ\u0103 ieftin\u0103 de determinare a suprafe\u021bei specifice. Acesta utilizeaz\u0103 metoda gazului de curgere, care determin\u0103 cantitatea de gaz (de exemplu, amestec de azot\/heliu) care se adsoarbe pe un e\u0219antion de prob\u0103 ca un singur strat de molecule, a\u0219a-numitul strat monomolecular.<\/span><\/p>

Folosind aceast\u0103 abordare, m\u0103sur\u0103torile totale ale suprafe\u021bei pot fi f\u0103cute rapid, la fiecare \u0219ase minute, \u00een func\u021bie de m\u0103rimea suprafe\u021bei.<\/span><\/p>

Este recomandat pentru realizarea rapid\u0103 \u0219i simpl\u0103 a determin\u0103rilor de suprafa\u021b\u0103 specific\u0103 pentru o gam\u0103 larg\u0103 de probe de pulberi incluz\u00e2nd:<\/span><\/p>

  • ingrediente farmaceutice active, \u00een special cele cu suprafe\u021be reduse<\/span><\/li>
  • o gam\u0103 de catalizatori nanostructura\u021bi.<\/span><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t
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    Caracteristici tehnice<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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    • metoda de analiz\u0103:<\/span><\/li>\n<\/ul>\n
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      1. indice de suprafa\u021b\u0103 BET \u2013 un singur punct de analiz\u0103<\/span><\/li>\n
      2. indice de suprafa\u021b\u0103 BET \u2013 3 puncte de analiz\u0103<\/span><\/li>\n
      3. volumul de pori (min. 0,005 cc\/g)<\/span><\/li><\/ol>\n
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        • domeniul de m\u0103sur\u0103: 0,10 – 2000 m<\/span>2<\/span>\/g<\/span><\/li>\n
        • timpul de analiz\u0103: 3 – 6 minute pentru o prob\u0103 (punct de analiz\u0103)<\/span><\/li>\n
        • productivitatea: 15 analize\/or\u0103 (analize \u00eentr-un singur punct) sau 3 analize\/or\u0103 (analiz\u0103 \u00een 3 puncte) <\/span><\/li>\n
        • precizia m\u0103sur\u0103torii: 0,01 m<\/span>2<\/span>\/g<\/span><\/li>\n
        • repetabilitate: 0,15%;<\/span><\/li>\n
        • Devia\u021bie Standard Relativ\u0103 (RDS)<\/span><\/li>\n<\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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          Num\u0103r\u0103tor de particule \u0219i celule<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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          Analizorul furnizeaz\u0103 informa\u021bii despre comportamentul probei \u00een timpul m\u0103sur\u0103rii (aglomerare, dizolvare, sedimentare), put\u00e2nd fi utilizat \u00een diverse domenii cum ar fi siguran\u021b\u0103 alimentar\u0103, domeniul biomedical, biotehnologii, biologie celular\u0103, bacteriologie, contaminarea aerului, ceramic\u0103, cosmetice, industria farmaceutic\u0103, industria alimentar\u0103, metale, alge marine, lubrifian\u021bi, fluide hidraulice, industria petrolier\u0103 \u0219i protec\u021bia mediului.<\/span><\/p>

          Principiul de m\u0103surare utilizat: electrical sensing zone, \u00een conformitate cu standardul ISO 13319.\u00a0<\/span><\/p>

          Un avantaj deosebit al cestui instrument \u00eel reprezint\u0103 faptul c\u0103 rezultatele NU sunt influen\u021bate de culoarea, forma particulelor sau compozi\u021bia \u0219i indicele de refrac\u021bie.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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          Caracteristici<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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          • \n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<\/i>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\tnum\u0103rarea particulelor \u0219i celulelor cu dimensiuni cuprinse \u00eentre: 0,2 \u0219i 1600 \u00b5m \u00een diametru \u0219i 0,033 fL \u0219i 2.145 x 109 fL sau \u03bcm3 \u00een volume<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t
          • \n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<\/i>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\tdistribu\u021bia dimensional\u0103 a particulelor dup\u0103: diametru, num\u0103r, volum \u0219i aria suprafe\u021bei, dintr-o singur\u0103 m\u0103surare <\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t
          • \n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<\/i>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\tcaracterizarea particulelor de orice natur\u0103 indiferent de culoare, form\u0103, compozi\u021bie \u0219i indicele de refrac\u021bie al acestora<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t
          • \n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<\/i>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\tselectarea a minim 400 de canale pentru un anumit interval de dimensiune selectat<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t
          • \n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<\/i>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\tdiferen\u021bierea clar\u0103 \u00eentre diferite clase de dimensiuni<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t
          • \n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<\/i>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\u00eenregistrarea a minim 500 000 de impulsuri per analiz\u0103<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t
          • \n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<\/i>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\tanaliza impulsurilor \u0219i a distribu\u021biei acestora \u00een func\u021bie de timp <\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t
          • \n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<\/i>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\tselectarea volumului \u00een intervalul: 50-2000 \u00b5L<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t
          • \n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<\/i>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\tdeterminarea automat\u0103 a eficien\u021bei filtr\u0103rii <\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t
          • \n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<\/i>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\treproductibilitate ridicat\u0103 a rezultatelor<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t<\/ul>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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            Specifica\u021bii<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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            • \n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<\/i>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\tintervalul de dimensiuni al particulelor m\u0103surate: de la 0,2 \u00b5m la 1600 \u00b5m<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t
            • \n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<\/i>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\tdiametrul nominal al aperturilor: 20-2000 \u00b5m <\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t
            • \n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<\/i>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\tlinearitate: +\/-1% pentru diametru; +\/-3% pentru volum<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t
            • \n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<\/i>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\tintervalul de curent pentru aperturi: 30 \u00b5A-6000 \u00b5A, selectabil \u00een pa\u0219i de 0,2 \u00b5A<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t
            • \n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<\/i>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\tacurate\u021bea curentului selectat: +\/-0,5%<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t
            • \n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<\/i>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\tdomeniul aperturii tubului de analiza: 2-80%<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t<\/ul>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

              Analizor dimensiune nanoparticule \u0219i poten\u021bial zeta Echipament analiz\u0103 suprafa\u021b\u0103 \u2013 BET Num\u0103r\u0103tor de particule \u0219i celule Analizor dimensiune nanoparticule \u0219i poten\u021bial zeta Determinarea are la baz\u0103 o tehnologie neinvaziv\u0103 bazat\u0103 pe difuzia dinamic\u0103 a luminii (DLS) emis\u0103 de un laser. Particula asimilat\u0103 cu o sfer\u0103 se afl\u0103 \u00een deplasare constant\u0103 datorit\u0103 mi\u0219c\u0103rii browniene ca urmare […]<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"elementor_header_footer","meta":{"footnotes":""},"class_list":["post-507","page","type-page","status-publish","hentry"],"yoast_head":"\nLaboratorul de caracterizare coloizi - FoodSafety<\/title>\n<meta name=\"description\" content=\"Sistemul de porozimetre cu gaz (Horiba SA 9600) ofer\u0103 o alternativ\u0103 ieftin\u0103 de determinare a suprafe\u021bei specifice.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/foodsafety.upb.ro\/en\/laboratorul-de-caracterizare-coloizi\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Laboratorul de caracterizare coloizi - 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