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101.
Wang D Nap RJ Lagzi I Kowalczyk B Han S Grzybowski BA Szleifer I 《Journal of the American Chemical Society》2011,133(7):2192-2197
Dissociation of ionizable ligands immobilized on nanopaticles (NPs) depends on and can be regulated by the curvature of these particles as well as the size and the concentration of counterions. The apparent acid dissociation constant (pK(a)) of the NP-immobilized ligands lies between that of free ligands and ligands self-assembled on a flat surface. This phenomenon is explicitly rationalized by a theoretical model that accounts fully for the molecular details (size, shape, conformation, and charge distribution) of both the NPs and the counterions. 相似文献
102.
Dr. Rui Zhang David A. Walker Prof. Bartosz A. Grzybowski Prof. Monica Olvera de la Cruz 《Angewandte Chemie (International ed. in English)》2014,53(1):173-177
Self‐replication is a remarkable phenomenon in nature that has fascinated scientists for decades. In a self‐replicating system, the original units are attracted to a template, which induce their binding. In equilibrium, the energy required to disassemble the newly assembled copy from the mother template is supplied by thermal energy. The possibility of optimizing self‐replication was explored by controlling the frequency at which energy is supplied to the system. A model system inspired by a class of light‐switchable colloids was considered where light is used to control the interactions. Conditions under which self‐replication can be significantly more effective under non‐equilibrium, cyclic energy delivery than under equilibrium constant energy conditions were identified. Optimal self‐replication does not require constant energy expenditure. Instead, the proper timing at which energy is delivered to the system is an essential controllable parameter to induce high replication rates. 相似文献
103.
Dr. Bilge Baytekin Dr. H. Tarik Baytekin Prof. Bartosz A. Grzybowski 《Angewandte Chemie (International ed. in English)》2014,53(27):6946-6950
Mechanical treatment of polymers produces surface cations and anions which, as demonstrated here for the first time, can drive chemical reactions. In particular, it is shown that such a mechanical treatment transforms nonconductive polyaniline into its conductive form. These results provide a mechanical means of patterning conductive polymers and also coating small polymer objects with conductive polyaniline films preventing accumulation of static electricity. 相似文献
104.
Back Cover: Gold(III)‐Mediated Contraction of Benzene to Cyclopentadiene: From p‐Benziporphyrin to Gold(III) True Tetraarylcarbaporphyrin (Chem. Eur. J. 5/2014)
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105.
106.
The present work describes a headspace single-drop microextraction (HS-SDME) method in conjunction with gas chromatography
electron capture detection (GC–ECD) for the determination of an organophosphate insecticide, chlorpyrifos-ethyl (CPF), in
rat liver. Sample preparation included tissue homogenization with methanol in the presence of anhydrous sodium sulfate in
order to isolate CPF from the matrix, followed by dilution with 10 mL of 0.1 M H2SO4 and headspace microextraction to a 2-μL drop of 1-octanol. The main factors affecting extraction efficiency were optimized
[temperature 90 °C, preheating and extraction times of eight and six minutes, respectively, 2 g of (NH4)2SO4, stirring rate of 1000 rpm, 200 μL of methanolic extract]. The method allows for the separation and quantitation of residue
levels of CPF in the livers of rats exposed orally to that insecticide. Using internal standardization (with chlorpyrifos-methyl
used as an internal standard), the linearity of the method was demonstrated in the range 10–2500 ng g−1 with a correlation coefficient R > 0.996 and a satisfactory level of precision (RSD 3.85%, n = 6). Moreover, the results obtained with the new method do not differ from those obtained with the conventional residue
method used in our laboratory. The feasibility of this HS-SDME approach as an equivalent analytical method for the determination
of CPF in rat liver that possessess advantages such as low cost, low solvent consumption and high throughput was confirmed.
Figure Headspace single-drop microextraction 相似文献
107.
Gwenaël Joret Piotr Micek Kevin G. Milans William T. Trotter Bartosz Walczak Ruidong Wang 《Combinatorica》2016,36(4):431-450
Over the last 30 years, researchers have investigated connections between dimension for posets and planarity for graphs. Here we extend this line of research to the structural graph theory parameter tree-width by proving that the dimension of a finite poset is bounded in terms of its height and the tree-width of its cover graph. 相似文献
108.
109.
Paszewski M Smoukov SK Klajn R Grzybowski BA 《Langmuir : the ACS journal of surfaces and colloids》2007,23(10):5419-5422
Photoswelling of thin films of dichromated gelatin provides a basis for fabrication of multilevel surface reliefs via sequential UV illumination through different photomasks. The remarkable feature of this simple, benchtop technique is that by adjusting irradiation times, film thickness, or its hydration state the heights of the developed features can be varied from few nanometers to tens of microns. After UV exposure, the surface structures can be replicated faithfully into either soft or hard PDMS stamps. 相似文献
110.
Smoukov SK Bishop KJ Kowalczyk B Kalsin AM Grzybowski BA 《Journal of the American Chemical Society》2007,129(50):15623-15630
Solutions containing oppositely charged nanoparticles (NPs) deposit "patchy" coatings of alternating charge distribution on various types of materials, including polymers, elastomers, and semiconductors. Surface adsorption of the NPs is driven by cooperative electrostatic interactions and does not require chemical ligation or layer-by-layer schemes. The composition and the quality of the coatings can be regulated by the types, the charges, and the relative concentrations of the NPs used and by the pH. Dense coatings form on flat, curvilinear, or micropatterned surfaces, are stable against common chemicals for prolonged periods of time, and can be used in applications ranging from bacterial protection to plasmonics. 相似文献