Browsing Waterloo Institute for Nanotechnology by Title
Now showing items 170-189 of 193
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Self-powered on-line ion concentration monitor in water transportation driven by triboelectric nanogenerator
(Elsevier, 2019-08)Ion concentration in water is a key criterion for evaluating water quality. In this work, we developed a self-powered on-line ion concentration monitor in water transportation based on impedance matching effect of triboelectric ... -
Sensing guanine and its derivatives: From molecular recognition to applications
(Elsevier, 2020-11)Guanine plays an indispensable role in building nucleic acids, and its derivatives take part in various cellular functions such as regulating biological reactions and signal transduction. Monitoring the levels of guanine ... -
Sensing Parts-per-Trillion Cd2+, Hg2+ and Pb2+ Collectively and Individually Using Phosphorothioate DNAzymes
(American Chemical Society, 2014-05-22)Cadmium, mercury, and lead are collectively banned by many countries and regions in electronic devices due to their extremely high toxicity. To date, no sensing method can detect them as a group and also individually with ... -
A Silver DNAzyme
(American Chemical Society, 2016-04-05)Silver is a very common heavy metal, and its detection is of significant analytical importance. DNAzymes are DNA-based catalysts; they typically recruit divalent and trivalent metal ions for catalysis. Herein, we report a ... -
Simulated electron affinity tuning in metal-insulator-metal (MIM) diodes
(American Institute of Physics, 2017-04-27)Metal-insulator-metal diodes for rectification applications must exhibit high asymmetry, nonlinearity, and responsivity. Traditional methods of improving these figures of merit have consisted of increasing insulator ... -
Solvent presence and its impact on the lap-shear strength of SDS-decorated graphene hybrid electrically conductive adhesives
(Elsevier, 2017-10-01)The mechanical bonding strength of electrically conductive adhesives (ECAs), as well as the impact of residual solvent on the bonding strength was investigated between a copper clad FR-4 surface and conductive adhesives ... -
Spontaneous Tilting Transition in Liquid-Crystalline Polymer Brushes
(2019)The equilibrium phase behavior of main-chain liquid-crystalline polymer brushes in good solvent is investigated using self-consistent field theory. The calculation assumes semi-dilute brushes, where the grafting density ... -
Stimuli-responsive releasing of gold nanoparticles and liposomes from aptamer-functionalized hydrogels
(Institute of Physics, 2011-11-21)Controlled release of therapeutic agents is important for improving drug efficacy and reducing toxicity. Recently, hydrogels have been used for controlled release applications. While the majority of the previous work focused ... -
Surface Science of DNA Adsorption onto Citrate-Capped Gold Nanoparticles
(American Chemical Society, 2012-02-28)Single-stranded DNA can be adsorbed by citrate capped gold nanoparticles (AuNPs), resulting in increased AuNP stability, which forms the basis of a number of biochemical and analytical applications, but the fundamental ... -
Surfactant-Structure Dependent Interactions with Modified Starch Nanoparticles Probed by Fluorescence Spectroscopy
(American Chemical Society, 2019-02-05)The interactions between the surfactants sodium dodecyl sulfate (SDS) and sodium dioctylsulfosuccinate (AOT) and starch nanoparticles hydrophobically modified with the hydrophobic dye pyrene (Py-SNPs) were investigated in ... -
Synergistic pH effect for reversible shuttling aptamer-based biosensors between graphene oxide and target molecules
(Royal Society of Chemistry, 2011-06-07)DNA aptamers are known to desorb from graphene oxide (GO) surface in the presence of target molecules. We demonstrate herein that the binding equilibrium can be shifted by simply tuning the solution pH. At lower pH, the ... -
Tandem DNAzymes for mRNA cleavage: choice of enzyme, metal ions and the antisense effect
(Elsevier, 2015-04-01)The concept of DNAzyme-based gene silencing via mRNA cleavage was proposed over twenty years ago. A number of studies regarding intracellular gene silencing have been reported as well. However, questions have been raised ... -
Tandem Phosphorothioate Modifications for DNA Adsorption Strength and Polarity Control on Gold Nanoparticles
(American Chemical Society, 2014-09-10)Unmodified DNA was recently used to functionalize gold nanoparticles via DNA base adsorption. Compared to thiolated DNA, however, the application of unmodified DNA is limited by the lack of sequence generality, adsorption ... -
Targeted nanoparticle binding & detection in petroleum hydrocarbon impacted porous media
(Elsevier, 2019-01-01)Targeted nanoparticle binding has become a core feature of experimental pharmaceutical product design which enables more efficient payload delivery and enhances medical imaging by accumulating nanoparticles in specific ... -
Temperature Response of Aqueous Solutions of Pyrene End-Labeled Poly(N-isopropyl acrylamide)s Probed by Steady-State and Time-Resolved Fluorescence
(Wiley, 2018-02-15)Aqueous solutions of a series of monodisperse poly(N‐isopropylacrylamide)s end‐labeled with n‐butyl‐1‐pyrene at one or both chain ends (Pyn‐PNIPAMs with n = 1 or 2) were studied by turbidimetry, light scattering, and ... -
Testing the Universality of Entropic Segregation at Polymer Surfaces
(2018)This study addresses entropic segregation effects at the surfaces of monodisperse and bidisperse melts. For the monodisperse melts, we focus on the segregation of chain ends to the surface, and for the bidisperse melts, ... -
Toward Fast and Quantitative Modification of Large Gold Nanoparticles by Thiolated DNA: Scaling of Nanoscale Forces, Kinetics, and the Need for Thiol Reduction
(American Chemical Society, 2013-08-01)We have recently reported on the fast and quantitative adsorption of DNA to 13 nm gold nanoparticles (AuNPs) at pH 3. This is in contrast to most traditional methods at neutral pH, where the adsorption is both slow and ... -
Towards understanding of poly-guanine activated fluorescent silver nanoclusters
(Institute of Physics, 2014-03-18)It has been recently reported that the fluorescence of some DNA-templated silver nanoclusters (AgNCs) can be significantly enhanced upon by hybridizing with a partially complementary DNA containing a G-rich overhang near ... -
Tunable covalent organic framework electrochemiluminescence from non-electroluminescent monomers
(Elsevier, 2021-10)It is hard to find new electrochemiluminescence (ECL) luminophores using existing research strategies, especially from ECL non-active monomers. Here, fully conjugated covalent organic frameworks with trithiophene (BTT-COFs) ... -
Two Pb2+-specific DNAzymes with opposite trends in split-site-dependent activity
(Royal Society of Chemistry, 2014-05-04)By splitting the catalytic core of DNAzymes into two halves, two Pb2+-specific DNAzymes retain partial activity, while they show opposite trends of activity as a function of the split site, revealing important nucleotides ...