{"id":141287,"date":"2022-09-28T13:36:07","date_gmt":"2022-09-28T11:36:07","guid":{"rendered":"https:\/\/concentrol.com\/new-laboratory-equipment-bubble-pressure-tensiometer\/"},"modified":"2022-09-28T13:42:58","modified_gmt":"2022-09-28T11:42:58","slug":"nou-equip-de-laboratori-tensiometre-de-pressio-de-bombolla","status":"publish","type":"post","link":"https:\/\/hosting175685eu-cp704.wordpresstemporal.com\/ca\/nou-equip-de-laboratori-tensiometre-de-pressio-de-bombolla\/","title":{"rendered":"Nou equip de laboratori: Tensi\u00f2metre de pressi\u00f3 de bombolla"},"content":{"rendered":"

[vc_row][vc_column][vc_column_text uncode_shortcode_id=\u00bb338883″]Una bona an\u00e0lisi de la qu\u00edmica \u00e9s essencial per oferir productes i serveis de qualitat. Concentrol augmenta cont\u00ednuament la capacitat t\u00e8cnica. Un exemple \u00e9s un \u00fatil que permet als laboratoris de la companyia mesurar la tensi\u00f3 superficial din\u00e0mica.<\/span><\/p>\n

La tensi\u00f3 superficial d’un l\u00edquid es defineix com l’energia necess\u00e0ria per augmentar-ne la superf\u00edcie una \u00e0rea determinada. \u00c9s una mesura de les forces d’atracci\u00f3 intermoleculars entre les diferents mol\u00e8cules d’un l\u00edquid a la superf\u00edcie: els l\u00edquids amb forces d’atracci\u00f3 intermoleculars fortes tenen una tensi\u00f3 superficial elevada.<\/span><\/p>\n

Hi ha diferents m\u00e8todes per mesurar la tensi\u00f3 superficial. Un dels m\u00e9s comuns \u00e9s l’anell de Du No\u00fcy que permet mesurar la tensi\u00f3 superficial est\u00e0tica del l\u00edquid. No obstant aix\u00f2, per a processos industrials on hi ha una generaci\u00f3 r\u00e0pida de noves superf\u00edcies, com poden ser aplicaci\u00f3 amb rodets o impressi\u00f3, \u00e9s interessant mesurar la tensi\u00f3 superficial din\u00e0mica. Per aix\u00f2 es pot utilitzar el m\u00e8tode din\u00e0mic de pressi\u00f3 de bombolla. Aquest instrument produeix bombolles a diferents freq\u00fc\u00e8ncies a trav\u00e9s d’un capil\u00b7lar submergit al l\u00edquid a analitzar i mesura la pressi\u00f3 necess\u00e0ria per formar una bombolla del radi del capil\u00b7lar (pressi\u00f3 m\u00e0xima). La pressi\u00f3 necess\u00e0ria per formar la bombolla est\u00e0 directament relacionada amb la tensi\u00f3 superficial.<\/span><\/p>\n

El valor de tensi\u00f3 superficial d’un l\u00edquid pur \u00e9s independent del temps de vida de la bombolla. Tot i aix\u00f2, la tensi\u00f3 superficial en fluids en pres\u00e8ncia d’additius tensioactius dep\u00e8n del temps de vida de la bombolla. Quan es genera una superf\u00edcie nova, les mol\u00e8cules de surfactant difonen cap a aquesta nova superf\u00edcie i s’orienten, aquest proc\u00e9s necessita temps i dep\u00e8n de la mobilitat del surfactant en soluci\u00f3. Per aix\u00f2, el valor tensi\u00f3 superficial din\u00e0mica dep\u00e8n del temps de vida de bombolla.<\/span><\/p>\n

Recentment, Concentrol ha adquirit un tensi\u00f2metre de pressi\u00f3 de bombolla per als laboratoris de R+D. Aquest equip permet la mesura de les tensions din\u00e0miques des d’un temps de bombolla de 15 mil\u00b7lisegons fins als 100000 mil\u00b7lisegons (100 segons) on els valors obtinguts es consideren quasi-est\u00e0tics. Aquest equip ens ajuda al desenvolupament de nous additius humectants, ja que ens permet observar difer\u00e8ncies en comportament entre diferents additius, com en la seg\u00fcent comparativa entre dos additius de la gamma ORDISOL SWT.<\/span><\/p>\n

S’han fet mesuraments de tensi\u00f3 superficial en aigua destil\u00b7lada utilitzant el m\u00e8tode de pressi\u00f3 m\u00e0xima de bombolla. S’han adquirit lectures en continu des dels 15 mil\u00b7lisegons fins als 50 segons de temps de bombolla. La dosi d’additiu humectant s’ha establert al 0,1%.<\/span><\/p>\n

Els valors de tensi\u00f3 superficial a temps de bombolla de 50 segons es poden considerar com un valor de tensi\u00f3 quasi-est\u00e0tic.<\/span><\/p>\n

 <\/p>\n

Resultats<\/b><\/i><\/p>\n\n\n\n\n\n
Ad. Humectant<\/b><\/td>\nTemps de bombolla (s)<\/b><\/td>\nTensi\u00f3 Superficial (mN\/m))<\/b><\/td>\n<\/tr>\n
ORDISOL SWT-31<\/span><\/td>\n48.483<\/span><\/td>\n38.3<\/span><\/td>\n<\/tr>\n
ORDISOL SWT-33<\/span><\/td>\n50.075<\/span><\/td>\n39.9<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
Taula 1: Mesuraments quasiest\u00e0tics de tensi\u00f3 superficial amb un temps de bombolla de 50 segons.<\/span><\/i><\/h6>\n

A continuaci\u00f3, es mostra el gr\u00e0fic de tensions superficials mesurades en els diferents temps de bombolla per a cada additiu. Es poden observar dues zones ben diferenciades al gr\u00e0fic: La primera (de 0,025 a 10 segons) s’observa una forta disminuci\u00f3 en els valors de tensi\u00f3 superficial a mesura que el temps de bombolla augmenta. Aquesta zona correspon a la regi\u00f3 de tensi\u00f3 superficial din\u00e0mica. A partir dels 10 segons, s’observa com la tensi\u00f3 superficial s’estabilitza disminuint el pendent de la corba. Aquesta zona correspon a la regi\u00f3 de tensi\u00f3 superficial quasi-est\u00e0tica.<\/span><\/p>\n

\"\"<\/span><\/p>\n

 <\/p>\n

Ampliaci\u00f3 de la regi\u00f3 din\u00e0mica: s’amplia la zona de la regi\u00f3 din\u00e0mica del gr\u00e0fic anterior. Es pot observar com l’ORDISOL SWT-31 t\u00e9 un comportament de disminuci\u00f3 de la tensi\u00f3 superficial din\u00e0mica m\u00e9s r\u00e0pid que l’ORDISOL SWT-33 obtenint valors de tensi\u00f3 din\u00e0mica inferiors per a cada temps de bombolla.<\/span><\/p>\n

\"\"<\/span><\/p>\n

 <\/p>\n

Aquesta nova eina exemplifica la voluntat de Concentrol de desenvolupar noves solucions per als seus clients, aix\u00ed com mantenir la millor qualitat als seus productes. Els laboratoris de l’empresa estan en investigaci\u00f3 cont\u00ednua, prova d’aix\u00f2 \u00e9s el continu que genera i finalment s’aplica a noves solucions l\u00edder del sector.<\/span>[\/vc_column_text][\/vc_column][\/vc_row]<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"

[vc_row][vc_column][vc_column_text uncode_shortcode_id=\u00bb338883″]Una bona an\u00e0lisi de la qu\u00edmica \u00e9s essencial per oferir productes i serveis de qualitat. Concentrol augmenta cont\u00ednuament la […]<\/p>\n","protected":false},"author":24,"featured_media":141276,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"content-type":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-141287","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-noticies"],"acf":[],"yoast_head":"\nNou equip de laboratori: Tensi\u00f2metre de pressi\u00f3 de bombolla<\/title>\n<meta name=\"description\" content=\"Concentrol - Chemical Solutions\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/concentrol.com\/ca\/nou-equip-de-laboratori-tensiometre-de-pressio-de-bombolla\/\" \/>\n<meta property=\"og:locale\" content=\"ca_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Nou 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