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Seminar INFLPR, Miercuri, 2.11.2016, ora 11:00, Sectia Laseri, Dr. Ion SANDU: „Studiul relaţiei dintre autoasamblarea unor nanomateriale si constrangerile geometrice impuse acestora”

Home Information Research Events Seminars Seminar INFLPR, Miercuri, 2.11.2016, ora 11:00, Sectia Laseri, Dr. Ion SANDU: „Studiul relaţiei dintre autoasamblarea unor nanomateriale si constrangerile geometrice impuse acestora”

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Seminar INFLPR

Miercuri, 2.11.2016, ora 11:00

Sectia Laseri, sala de seminar

Contractul nr.: 4N/2016

Proiectul: PN 16 47 01 01, “Cercetari avansate asupra materiei aflata in conditii extreme”

Faza nr. 7: „Studiul relaţiei dintre autoasamblarea unor nanomateriale si constrangerile geometrice impuse acestora”

Termen: 15 Octombrie 2016

Responsabil faza: Dr. Ion Sandu

Prezinta: Dr. Ion SANDU

Raport de faza la proiectul NUCLEU.

Abstract:
Intr-o lume in care tehnologiile curente, „inalte”, sofisticate si scumpe tind sa isi atinga limitele, abordarile ieftine dar nu mai putin sofisticate ar putea sa le inlocuiasca. In acest scop, autoasamblarea pare sa fie una dintre cele mai promitatoare. Autoasamblarea este principiul fundamental care genereaza organizare structurala la toate nivelurile, de la molecule la galaxii si consta in organizarea autonoma a unor componente in tipare sau structuri ordonate fara interventia omului [G.M. Whitesides and B. Grzybowski, Self-Assembly at All Scales, Science 2095, 2002]. Autoasamblarea se face prin intermediul unor forte precum cele: magetice, electrice, electro-magnetice, Van der Waals, gravitationale, hidrofobe precum si a unei pseudo-forte si anume constrangerea geometrica. Prin depunerea unor picaturi sau filme lichide care contin nano-obiecte pe un substrat si evaporarea solventului, am observat ca arhitectura picaturii sau a filmului lichid poate influenta dramatic calitatea monostratului de nano-obiecte auto-asamblate. Am descoperit ca o picatura coloidala constransa geometric sa fie plata (de catre un esafodaj extern) isi ordoneaza particulele in benzi monostrat fara dislocatii. Aceasta calitate le face potrivite sa fie folosite ca dispozitive in fenomenele de tip difractie Bragg sau ca masti litografice. Am gasit de asemenea ca unele saruri ionice cristalizeaza (din solutii apoase) sub forma de retele mono-cristaline atunci cand solutiile lor diluate sunt evaporate ca filme subtiri (constrangere geometrica) pe plita incinsa. Un alt treilea domeniu studiat a fost despre diferentele posibile in statica, evaporarea si cristalizarea unor picaturi depuse pe substrat plan ”infinit” si pe suprafata superioara a unor stalpi cilindrici (aplicatii posibile in tehnica VLS). Rezultatele gasite in studiul influentei constrangerii geometrice asupra fenomenului de auto-asamblare ar putea duce la fabricarea unor dispozitive performante si totusi ieftine.

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