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IZDELAVA MIKRO-VAKUUMSKEGA PRIJEMALA ZA POTREBE GRADNJE MEMS-ov
Nina Božič, 2009, diplomsko delo

Opis: Diplomska naloga je razdeljena na dva večja dela. V prvem, teoretičnem delu sem se najprej posvetila raziskavi področja nano-tehnologije za potrebe gradnje MEMS-ov. Podanih je nekaj primerov uporabe le teh. Sledi pregled trenutno poznanih prijemal za potrebe mikro in nano-pozicioniranja. Teoretični del naloge se zaključi z opisom sistema nano-robotske celice, ki je v praktičnem delu uporabljen za izvedbo eksperimentov. V praktičnem delu naloge je predstavljen celoten razvoj in izdelava lastnega mikro- prijemala, ki deluje na vakuumskem principu. Vakuumsko mikro-prijemalo omogoča rokovanje z mikro-delci. Razvite so bile štiri različne variante mikro-vakuumskih prijemal, ki smo jih v okviru eksperimentov tudi preizkusili. V nalogi so podane osnovne smernice in napotki za razvoj te vrste prijemal.
Ključne besede: nano-robot, mikro-prijemalo, nano-tehnologije, MEMS
Objavljeno: 21.09.2009; Ogledov: 2206; Prenosov: 196
.pdf Celotno besedilo (2,26 MB)

3.
ANALIZA NANO-KOMPOZITNIH FILTROV Z UPORABO MALOKOTNEGA IN ŠIROKOKOTNEGA RENTGENSKEGA SIPANJA (SWAXS)
Petra Gašparič, 2011, diplomsko delo

Opis: Cilj naloge »Analiza nano-kompozitnih filtrov z uporabo malokotnega in širokokotnega rentgenskega sipanja (SWAXS)« je izdelati nano-kompozit in z uporabo malokotne rentgenske analizne metode (SAXS) analizirati strukturo ter določiti vpliv različnih pogojev na razplastitev plastenih silikatov. Pripravili smo disperzije nanodelcev montmorilonita z različnimi površinsko aktivnimi sredstvi v različnih koncentracijah. Iz disperzij smo s postopkom fotopolimerizacije izdelali polimerizirane N-isopropilakrilamidne (PNIPAAM) hidrogele z vključenimi plastenimi silikati. Analizirali smo morfološke značilnosti hidrogelov z vrstičnim elektronskim mikroskopom (SEM). Z rentgensko strukturno analizo smo določili stopnjo razplastitve plastenih silikatov v disperziji, v disperziji z dodatkom monomera ter v hidrogelu. Na podlagi SEM posnetkov hidrogelov smo ugotovili, da je pri vseh prisotna porna struktura v obliki satovja. Na podlagi rentgenskih sipalnih krivulj smo izračunali dimenzije galerij v plastenih silikatih in ugotovili, da se te povečajo že ob dodatku monomera pred polimerizacijo, kar pomeni, da imamo vrinjeno strukturo oz. interkalacijo. Po polimerizaciji so razdalje med plastmi še večje oz. na sipalni krivulji ni izrazitega maksimuma, ki bi kazal na prisotnost ponavljajočih se strukturnih enot. Izdelali smo nano-kompozit z delaminirano oz. razplasteno strukturo.
Ključne besede: plasteni silikati, površinsko aktivna sredstva, nano-kompoziti, malokotno rentgensko sipanje (SAXS)
Objavljeno: 07.10.2011; Ogledov: 1368; Prenosov: 87
.pdf Celotno besedilo (4,09 MB)

4.
Calculation of the thermal conductivity of nanofluids containing nanoparticles and carbon nanotubes
Jurij Avsec, Maks Oblak, 2003, izvirni znanstveni članek

Opis: A mathematical model for the calculation of thermal conductivity of nanofluids containing nanoparticles and nanotubes on the basis of statistical mechanics is presented. This appears to be the first such attempt published in the scientific literature. We focus on the influence of the liquid layer structure around nanoparticles as the reason for enhancement of the thermal conductivity of nanofluids. Analytical results of both the current analysis and statistical mechanics are compared with experimental data reported in the scientific literature, which show good agreement.
Ključne besede: statistical thermodynamics, mathematical models, thermal conductivity, nanofluids, transport properties, statistical nano-mechanics
Objavljeno: 31.05.2012; Ogledov: 1078; Prenosov: 48
URL Povezava na celotno besedilo

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CFD analysis of exothermic reactions in Al-Au nano multi-layered foils
Karlo Raić, Rebeka Rudolf, Primož Ternik, Zoran Žunič, Vojkan Lazić, Dragoslav Stamenković, Tatjana Tanasković, Ivan Anžel, 2011, izvirni znanstveni članek

Opis: This work presents the possibility of numerical modelling using Computational Fluid Dynamics (CFD) in the field of nano-foils. The governing equations were solved using a Finite Volume Methodology (FVM). The computational domain was discretized using a uniform Cartesian grid with the appropriate mesh size along the x and y directions employing the corresponding number of grid points. The field variables were discretized at the cell centres and the spatial, as well as the time, derivatives were approximated using the second-order accurate numerical scheme. The time-evolution of the temperature and concentration fields, as well as the atomic diffusion coefficient, will be presented for the appropriate Al-Au nano-foil geometry and boundary conditions.
Ključne besede: Au-Al nano-foils, finite volume method, temperature transfer, concentration transfer
Objavljeno: 01.06.2012; Ogledov: 956; Prenosov: 56
.pdf Celotno besedilo (526,41 KB)
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7.
Au-nano-delci in njihova uporaba
Rebeka Rudolf, Lidija Zorko, Ivan Anžel, 2011, izvirni znanstveni članek

Opis: Razvoj tehnik za sintezo Au-nano delcev z določeno velikostjo, obliko in sestavo je izziv in pomembno področje raziskav v nanotehnologiji. Zlati nanodelci so namreč atraktivni zaradi potencialne uporabe v elektrokemiji in medicini, kot tudi za proizvodnjo različnih nano-naprav.
Ključne besede: Au, nano-delci, nano-tehnologije, uporabnost
Objavljeno: 01.06.2012; Ogledov: 1057; Prenosov: 36
URL Povezava na celotno besedilo

8.
Gold in the past, today and future
Rebeka Rudolf, Maša Anžel, Evgenija Marković, Miodrag Čolić, Dragoslav Stamenković, 2012, pregledni znanstveni članek

Opis: This paper deals with gold, which is described as a chemical element. Special attention is paid to its physical-chemical properties and, furthermore, where or in what form it can be found in nature. We discuss the role it has played through history and we inform how gold has been developed to the level it has reached today's value. Still more, when gold is broken into nanoparticles, this form could be highly useful for a wide range of processes, including general nanotechnology, electronics manufacturing and the synthesizing of different functional materials. It is important that we know that gold is also used in industry in many engineering applications (contacts in micro-electronics) and medicine (dental alloys, implants).
Ključne besede: gold, physical-chemical properties, nano-particles, applications
Objavljeno: 01.06.2012; Ogledov: 1604; Prenosov: 56
.pdf Celotno besedilo (144,60 KB)
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9.
Binding silver nano-particles onto viscose non-woven using different commercial sol-gel procedures
Tanja Pivec, Zdenka Peršin, Silvo Hribernik, Tina Maver, Mitja Kolar, Karin Stana-Kleinschek, 2012, izvirni znanstveni članek

Opis: The paper presents possible solution of Ag binding using commercial sol-gel systems which enable its low release into a wound, providing a good antimicrobial effect on those bacterial cultures that are most likely present in the wound. The influence of different sol-gel systems on the hydrophilic properties of carrier materials and the level of released silver has been studied. The results showed that sol-gel as binding-systems could provide proper hydrophilic properties of material, whilst binding silver strongly enough providing at the same time excellent antimicrobial activity of the treated viscose meterials.
Ključne besede: silver nano-particles, sol-gel, viscose non-woven, silver release, hydrophilicity, antimicrobial properties
Objavljeno: 01.06.2012; Ogledov: 1917; Prenosov: 38
.pdf Celotno besedilo (235,88 KB)
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10.
Nanofoils for soldering and brazing in dental joining practice and jewellery manufacturing
Karlo Raić, Rebeka Rudolf, Borut Kosec, Ivan Anžel, Vojkan Lazić, Aleksandar Todorović, 2009, izvirni znanstveni članek

Opis: This paper describes the development of novel, reactive Al-Au nano-multilayered foils, their possible application in different fields and a discussion of the nano-foils' suitability for dental and jewellery applications. Moreover, this study includes the rapid joining of similar and dissimilar materials, by placing multilayer nano-foils and two layers of solder or braze. The foils precisely control the instantaneous release of heatenergy for the joining and act as a controllable local heat source. The reactive foils' thickness is in the range 10 nm to less than 100 nm and they contain many nanoscale layers that alternate between materials with high mixing heats, such as Al and Au. The foil between the two solder/braze layers melts the solder/braze with the heat generated by the reaction and bonds the components. The use of reactive foils eliminates the need for a furnace and dramatically increases the soldering/brazing heating rate of the components being bonded. Thus, ceramics and metals can be fused over required areas without the thermal stresses that are encountered in furnace soldering or brazing. In addition, a completely new plasma technology is proposed for the manufacturing of nano-foils and the first results of the preliminary experimental testing are presented.
Ključne besede: ceramic-metal bonding, low-temperature, nano-foils, plasma technology, dentistry, jewellery
Objavljeno: 01.06.2012; Ogledov: 1203; Prenosov: 34
.pdf Celotno besedilo (175,31 KB)
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