Search results for "nanotekniikka"

Pienestä syntyi suurta = Nano came to Jyväskylä

2014

Dielectric breakdown strength of epoxy bimodal-polymer-brush-grafted core functionalized silica nanocomposites

2014

The central goal of dielectric nanocomposite design is to create a large interfacial area between the matrix polymer and nanofillers and to use it to tailor the properties of the composite. The interface can create sites for trapping electrons leading to increased dielectric breakdown strength (DBS). Nanoparticles with a bimodal population of covalently anchored molecules were created using ligand engineering. Electrically active short molecules (oligothiophene or ferrocene) and matrix compatible long poly(glycidyl methacrylate) (PGMA) chains comprise the bimodal brush. The dielectric breakdown strength was evaluated from recessed samples and dielectric spectroscopy was used to study the di…

Constructing Large 2D Lattices Out of DNA-Tiles.

2021

The predictable nature of deoxyribonucleic acid (DNA) interactions enables assembly of DNA into almost any arbitrary shape with programmable features of nanometer precision. The recent progress of DNA nanotechnology has allowed production of an even wider gamut of possible shapes with high-yield and error-free assembly processes. Most of these structures are, however, limited in size to a nanometer scale. To overcome this limitation, a plethora of studies has been carried out to form larger structures using DNA assemblies as building blocks or tiles. Therefore, DNA tiles have become one of the most widely used building blocks for engineering large, intricate structures with nanometer precis…

State Preparation and Tomography of a Nanomechanical Resonator with Fast Light Pulses

2018

Pulsed optomechanical measurements enable squeezing, non-classical state creation and backaction-free sensing. We demonstrate pulsed measurement of a cryogenic nanomechanical resonator with record precision close to the quantum regime. We use these to prepare thermally squeezed and purified conditional mechanical states, and to perform full state tomography. These demonstrations exploit large photon-phonon coupling in a nanophotonic cavity to reach a single-pulse imprecision of 9 times the mechanical zero-point amplitude $x_\mathrm{zpf}$. We study the effect of other mechanical modes which limit the conditional state width to 58 $x_\mathrm{zpf}$, and show how decoherence causes the state to…

Potential applications of nanotechnology in bioenergy

2011

Nanotechnology has an increasingly large impact on a wide range of industries, but its current use in the production of electricity and heat from biomass is limited. This thesis examined the potential impact of nanotechnology on bioenergy production through a literature review and interviews with industry members. Current technologies and methods in use were reviewed, with a focus on fuel handling and combustion systems. Areas in which problems existed were identified and nanotechnologies with properties relevant to those problems examined. The major nanotechnology areas which were reviewed are nanostructured coatings (wear resistant, corrosion resistant, low friction and anti-icing), nanom…

Black Bioinks from Superstructured Carbonized Lignin Particles

2023

A renewable source of carbon black is introduced by the processing of lignin from agro-forestry residues. Lignin side streams are converted into spherical particles by direct aerosolization followed by carbonization. The obtained submicron black carbon is combined with cellulose nanofibers, which act as a binder and rheology modifier, resulting in a new type of colloidal bioink. The bioinks are tested in handwriting and direct ink writing. After consolidation, the black bioinks display total light reflectance (%R) at least three times lower than commercial black inks (reduction from 12 to 4%R). A loading of up to 20% of nanofibers positively affects the cohesion of the dried bioink (1 to 16…

DNA-based applications in molecular electronics

2011

This thesis is mainly focused on DNA molecules and especially on self-assembled DNA constructs and their potential applications in nanotechnology and molecular electronics. In the field of molecular electronics the conductivity of DNA is a crucial - yet open - question, and it is of great concern, since DNA is a very promising molecule in a context of bottom-up based nanodevices due to its superior selfassembly characteristics. A key tool in all the experiments presented in this thesis is a dielectrophoretic trapping technique, which was exploited in spatial manipulation of individualDNA molecules, DNA constructs and also semiconducting quantum dots. In the case of DNA, the technique provid…

Expansion and Compression of a Helicate with Central Diol-Units as Stereocontrolling Moieties

2022

The dicatechol ester ligand 2-H4 forms the compressed helicate Li4[(2)3Ti2] which upon removal of the internally bound lithium cations expands. In the compressed form, the chiral diol units control the stereochemistry of the complex which is lost upon expansion of the system. peerReviewed

Nanomanipulaatioon ja elektronimikroskopiaan perustuva hiilinanoputkien käsittelymenetelmä

2008

Hiilinanoputkien käyttö transistorikomponenteissa : hiilinanoputkinäytteiden laadun parantaminen, transistorikomponenttien valmistus sekä niiden sähk…

2011

Puolijohdeteollisuuden kantavana voimana on alusta saakka ollut mikroprosessorien laskentatehon jatkuva kasvu, minkä on sallinut valmistusmenetelmien alituinen tehostuminen. Erityisen merkittävässä osassa on ollut yksittäisten transistorikomponenttien koon pienentyminen, sekä niiden pinta-alatiheyden kasvu substraatilla. On kuitenkin tunnustettu tosiasia, että sama kehitys ei voi jatkua enää pitkään, sillä jo nyt toimitaan nykyisten valmistusmenetelmien fysikaalisilla äärirajoilla. Suotuisan kehityksen turvaamiseksi on siis välttämätöntä ottaa käyttöön kokonaan uusia menetelmiä ja materiaaleja. Tutkielmani liittyy hiilinanoputkien (carbon nanotubes, CNTs) käyttöön sähköisissä komponenteissa…