A. Ciuciumis

National Institute for Research and Development in Microtechnologies - IMT Bucharest, Parcu Voluntarilor, Ilfov, Romania

Are you A. Ciuciumis?

Claim your profile

Publications (11)0.2 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: The microchannel based microfluidic devices were obtained using techniques assuming thermal treatments up to 1000°C affecting the processes previously realized on the IC chip. This paper aims to realize low temperature technological processes to obtain microfluidic devices used for biological applications, and in thermal transfer as micro-heat sinks, used in IC chip cooling. The both methods use the positive resist as a sacrificial layer, for the first one having thickness 2 ¿m obtaining semicircular channels with applications in biology, for second one 15-20 ¿m, obtaining near-rectangular channels having applications in thermal transfer for IC chip cooling.
    Semiconductor Conference, 2007. CAS 2007. International; 01/2007
  • Alina Ciuciumis, Ileana Cernica
    [Show abstract] [Hide abstract]
    ABSTRACT: Sol-gel technology is a relatively simple and cheap process to deposit oxides under thin film form out of a sol. The experiments were developed in order to obtain nanomaterials by sol-gel method; nanomaterials that mixed with resin and additives can be deposited in thin and uniform films by spraying on different lignocellulosic composite surfaces. This method assures a functional finishing of the nanomaterials. These films are transparent and the surfaces are flat with no cracks. The influence of substrate type, morphology of the films and of the substrates before and after deposition was studied by means of optical microscopy, scanning electron microscopy (SEM) and atomic force microscopy (AFM). The sol-gel deposit on the lignocellulosic composite substrates lowered the sorption rates of water and water vapours.
    Proceedings of SPIE - The International Society for Optical Engineering 01/2007; DOI:10.1117/12.742078 · 0.20 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Microchannels are very important for microfluidic devices because they carry liquid orfluid quantities, aiming to realize biochemical micro reactions, IC cooling, etc. The most of microfluidic devices used until now bulk micromachining technologies to fabricate microchannels, microchambers, involving high temperature bonding processes. So, the material cost is enough expensive because one extra wafer is needed to encapsulate the microfluidic system. In this paper, two low temperatures, IC -compatible technological processes for microchannels based microfluidic devices fabrication are described. Arrays of microchannels and microfluidic devices (comprising also microchambers / microalveoli) have been fabricated on silicon, or other substrates.
    International Semiconductor Conference, 2006, Sinaia, Romania; 09/2006
  • D. Ulieru, A. Ciuciumis, A. Tantau, E. Ulieru
    [Show abstract] [Hide abstract]
    ABSTRACT: The newly developed mask projection process, called laser direct patterning (LDP) is a process for the high volume production with conductive and reflecting sensors. Due to its simple process mechanism it combines precision and economic efficiency. Depending of material, sensors and sensor elements of thin metal films with lines and spaces 15 m are producible. The paper present the principle of laser ablation of thin metal on polymer substrate, also represented the systems engineering and described the selected applications of this technology for industrial manufacturing
  • D. Ulieru, A. Ciuciumis
    [Show abstract] [Hide abstract]
    ABSTRACT: The improvement of pattern resolution for microsystems fabrication is certainly a proven method for increasing of micro and nanostructure density. Our novel laser technology could be applied for thin metal or alloy films on polymer substrates, which could be structured directly with the laser direct patterning process. So is possible to manufacture ultrafine conductive or reflective structures down to 15 μm in an economical and environmentally friendly way. Increasing demand on the accuracy of microsystems and sensors requires microstructures with lines and spaces down of approximately 5-100 μm.
    Semiconductor Conference, 2005. CAS 2005 Proceedings. 2005 International; 11/2005
  • [Show abstract] [Hide abstract]
    ABSTRACT: The use of microfluidic devices in biomedical research creates clinically useful technologies and devices (for biochemical reaction chambers, and physical particle separation), or in IC chip cooling applications has significant advantages. In the first case, because the fluid volumes within these microchannels are very small, usually several nanoliters, the amount of reagents and analytes used is quite small. In the second case, they present a negligible thermal resistance, due to direct contact with the chip dissipation surface. This paper presents some new technological methods used to prepare by surface microfabrication microchannels and other microfluidic elements, like chambers onto different substrates.
    Semiconductor Conference, 2005. CAS 2005 Proceedings. 2005 International; 11/2005
  • A. Ciuciumis, I. Cernica
    [Show abstract] [Hide abstract]
    ABSTRACT: The paper presents indium tin oxide and cerium dioxide thin films obtained by sol-gel method and deposited on the different wood substrates. Films deposition was performed by immersion of the substrates into coating solution and flow-coating process. Investigation of the surface chemistry and morphology of the wood substrates before and after deposition were obtained by means of atomic force microscopy and optical microscopy. The sol-gel deposit on the wood substrates lowered the rates of water and water vapour sorption (absorption and/or adsorption).
    Semiconductor Conference, 2005. CAS 2005 Proceedings. 2005 International; 11/2005
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: We present the results of an experimental study regarding the increase of the silicon solar cells efficiency by texturing the front surface and the fabrication of microcells on borosilicate glass substrate using silicon micromachining technologies. A `honeycomb' textured front surface has been obtained using a photolithography process to generate patterns (disc hole) on the top surface followed by isotropic etching
    Optical MEMS and Their Applications Conference, 2005. IEEE/LEOS International Conference on; 09/2005
  • International Materials Research Congress, Mexic; 01/2005
  • A. Ciuciumis, A. Folea, I. Cernica
    [Show abstract] [Hide abstract]
    ABSTRACT: This paper presents the effect of heating rate on the sintering behavior and the influence amounts of dopants on the stabilization powders. Different types of powders (doped with La<sub>2</sub>O<sub>3</sub>) were sintered at 1100°C for 2h with a wide range of heating rate. Investigations of phase compositions, densification and microstructure were performed.
    Semiconductor Conference, 2004. CAS 2004 Proceedings. 2004 International; 11/2004
  • A. Ciuciumis, A. Folea, D. Radu
    [Show abstract] [Hide abstract]
    ABSTRACT: The paper presents the experiments developed in order to establish an improved processing technique for ceramic materials, characterized by low temperature and short heating time. The aims are the enhancement of electrical and mechanical properties, when compared to the ceramics prepared by conventional sintering process. The advantages of the new technique based on microwaves were evidenced.
    Semiconductor Conference, 2003. CAS 2003. International; 01/2003