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  • 1.
    Thapa, Anshu
    et al.
    Univ Sao Paulo, Sao Carlos, SP, Brazil; Univ Bath, England.
    Soares, Andrey Coatrini
    Univ Sao Paulo, Sao Carlos, SP, Brazil.
    Soares, Juliana Coatrini
    Univ Sao Paulo, Sao Carlos, SP, Brazil.
    Awan, Iram Taj
    Univ Sao Paulo, Sao Carlos, SP, Brazil.
    Volpati, Diogo
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Melendez, Matias Eliseo
    Barretos Canc Hosp, Barretos, Brazil.
    Guerreiro Fregnani, Jose Humberto Tavares
    Barretos Canc Hosp, Barretos, Brazil.
    Carvalho, Andre Lopes
    Barretos Canc Hosp, Barretos, Brazil.
    Oliveira, Osvaldo N., Jr.
    Univ Sao Paulo, Sao Carlos, SP, Brazil.
    Carbon Nanotube Matrix for Highly Sensitive Biosensors To Detect Pancreatic Cancer Biomarker CA19-92017In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 9, no 31, p. 25878-25886Article in journal (Refereed)
    Abstract [en]

    Biosensors fabricated with nanomaterials promise faster, cheaper, and more efficient alternatives to traditional, often bulky devices for early cancer diagnosis. In this study, we fabricated a thin film sensing unit on interdigitated gold electrodes combining polyethyleneimine and carbon nanotubes in a layer by layer fashion, onto which antibodies anti-CA19-9 were adsorbed with a supporting layer of N-hydroxysuccini-mide and 1-ethyl-3 (3-dimethylaminopropyl) carbodiimide solution. By use of impedance spectroscopy, the pancreatic cancer biomarker CA19-9 was detected in a buffer with limit of detection of 0.35 U/mL. This high sensitivity allowed for distinction between samples of blood serum from patients with distinct probabilities to develop pancreatic cancer. The selectivity of the biosensor was confirmed in subsidiary experiments with HT-29 and SW-620 cell lines and possible interferents, e.g., p53 protein, ascorbic acid, and glucose, where significant changes in capacitance could only be measured with HT-29 that contained the CA19-9 biomarker. Chemisorption of CA19-9 molecules onto the layer of anti-CA19-9 antibodies was the mechanism responsible for sensing while electrostatic interactions drove the adsorption of carbon nanotubes, according to polarization modulated infrared reflection absorption spectroscopy (PM-IRRAS). The adsorption behavior was successfully described by the Langmuir-Freundlich isotherm.

  • 2.
    Zhao, Yadong
    et al.
    KTH Royal Institute of Technology.
    Moser, Carl
    KTH Royal Institute of Technology och Valmet AB .
    Henriksson, Gunnar
    KTH Royal Institute of Technology.
    Lindström, Mikael E.
    KTH Royal Institute of Technology.
    Li, Jiebing
    KTH Royal Institute of Technology.
    Cellulose Nanofibers from Softwood, Hardwood, and Tunicate: Preparation-Structure-Film Performance Interrelation2017In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 9, no 15, p. 13508-13519Article in journal (Refereed)
    Abstract [en]

    This work reveals the structural variations ofcellulose nanofibers (CNF) prepared from different cellulosesources, including softwood (Picea abies), hardwood (Euca-lyptus grandis × E. urophylla), and tunicate (Ciona intestinalis),using different preparation processes and their correlations tothe formation and performance of the films prepared from theCNF. Here, the CNF are prepared from wood chemical pulpsand tunicate isolated cellulose by an identical homogenizationtreatment subsequent to either an enzymatic hydrolysis or a2,2,6,6-tetramethylpiperidinyl-1-oxyl (TEMPO)-mediated oxi-dation. They show a large structural diversity in terms ofchemical, morphological, and crystalline structure. Amongothers, the tunicate CNF consist of purer cellulose and have a degree of polymerization higher than that of wood CNF.Introduction of surface charges via the TEMPO-mediated oxidation is found to have significant impacts on the structure,morphology, optical, mechanical, thermal, and hydrophobic properties of the prepared films. For example, the film density isclosely related to the charge density of the used CNF, and the tensile stress of the films is correlated to the crystallinity index ofthe CNF. In turn, the CNF structure is determined by the cellulose sources and the preparation processes. This study providesuseful information and knowledge for understanding the importance of the raw material for the quality of CNF for various typesof applications.

  • 3.
    Öhlund, Thomas
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Schuppert, Anna
    Institut Charles Gerhardt de Montpellier, France.
    Hummelgård, Magnus
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Bäckström, Joakim
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Nilsson, Hans-Erik
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.
    Olin, Håkan
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Inkjet Fabrication of Copper Patterns for Flexible Electronics: Using Paper with Active Precoatings2015In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 7, no 33, p. 18273-18282Article in journal (Refereed)
    Abstract [en]

    Low-cost solution-processing of highly conductive films is important for the expanding market of printed electronics. For roll-to-roll manufacturing, suitable flexible substrates and compatible postprocessing are essential. Here, custom-developed coated papers are demonstrated to facilitate the inkjet fabrication of high performance copper patterns. The patterns are fabricated in ambient conditions using water-based CuO dispersion and intense pulsed light (IPL) processing. Papers using a porous CaCO3 precoating, combined with an acidic mesoporous absorption coating, improve the effectiveness and reliability of the IPL process. The processing is realizable within 5 ms, using a single pulse of light. A resistivity of 3.1 ± 0.12 μΩ·cm is achieved with 400 μm wide conductors, corresponding to more than 50% of the conductivity of bulk copper. This is higher than previously reported results for IPL-processed copper.

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