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排序方式: 共有235条查询结果,搜索用时 15 毫秒
91.
Kumar AM Sivakova S Fox JD Green JE Marchant RE Rowan SJ 《Journal of the American Chemical Society》2008,130(4):1466-1476
Novel supramolecular coatings that make use of low-molecular weight ditopic monomers with guanine end groups are studied using fluid tapping AFM. These molecules assemble on highly oriented pyrolytic graphite (HOPG) from aqueous solutions to form nanosized banding structures whose sizes can be systematically tuned at the nanoscale by tailoring the molecular structure of the monomers. The nature of the self-assembly in these systems has been studied through a combination of the self-assembly of structural derivatives and molecular modeling. Furthermore, we introduce the concept of using these molecular assemblies as scaffolds to organize functional groups on the surface. As a first demonstration of this concept, scaffold monomers that contain a monomethyl triethyleneglycol branch were used to organize these "functional" units on a HOPG surface. These supramolecular grafted assemblies have been shown to be stable at biologically relevant temperatures and even have the ability to significantly reduce static platelet adhesion. 相似文献
92.
Paul H.J.Kouwer Paula de Almeida Onno ven den Boomen Zaskia H.Eksteen-Akeroyd Roel Hammink Maarten Jaspers Stijn Kragt Mathijs F.J.Mabesoone Roeland J.M.Nolte Alan E.Rowan Martin G.T.A.Rutten Vincent A.A.Le Sage Daniёl C.Schoenmakers Chengfen Xing Jialiang Xu 《中国化学快报》2018,29(2):281-284
The gelation temperature and mechanical properties of aqueous ethylene glycol-decorated polyisocyanide solutions strongly depends on the length of the glycol tail. Copolymerisation of monomers with different tail lengths allows for precise engineering of the gel properties. 相似文献
93.
Tulloch WM Rutherford TS Huntington EH Ewart R Harb CC Willke B Gustafson EK Fejer MM Byer RL Rowan S Hough J 《Optics letters》1998,23(23):1852-1854
We present measurements of the power noise that is due to optical amplification in a laser-diode-pumped Nd:YAG free-space traveling-wave linear amplifier in a master-oscillator-power-amplifier configuration. The quantum noise behavior of the optical amplifier was demonstrated by use of InGaAs photodetectors in a balanced detection configuration, at a total photocurrent of 100 mA and in a frequency band from 6.25 to 15.625 MHz. The experimental results are in good agreement with predictions. 相似文献
94.
Erik Schwartz Matthieu Koepf Heather J. Kitto Mónica Espelt Vicent J. Nebot‐Carda Rene De Gelder Roeland J. M. Nolte Jeroen J. L. M. Cornelissen Alan E. Rowan 《Journal of polymer science. Part A, Polymer chemistry》2009,47(16):4150-4164
The design and synthesis of functional biomimetic water soluble polymers with a defined secondary structure has been developed using β‐sheet polyisocyanopeptide scaffolds. Water soluble isocyanopolymers were prepared by random copolymerisation of the azido functionalized isocyanopeptides with nonfunctionalised methyl ester isocyanides derived from alanine. Upon saponification of the latter function a rigid rod water soluble polymer was obtained with an accessible azide for postfunctionalization. The potential of these biomimetic polymers was successfully demonstrated by using the click chemistry reaction of these polymers with an acetylene functionalised rhodamine dye. © 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 4150–4164, 2009 相似文献
95.
Wester de Poel Sander J. T. Brugman Kim H. A. van de Ven Anouk Gasseling Jordi de Lange Eleanor R. Townsend Anthonius H. J. Engwerda Maciej Jankowski Melian A. R. Blijlevens Ben L. Werkhoven Jakub Drnec Francesco Carl Roberto Felici Aashish Tuladhar Narendra M. Adhikari James J. De Yoreo Johannes A. A. W. Elemans Willem J. P. van Enckevort Alan E. Rowan Elias Vlieg 《Angewandte Chemie (International ed. in English)》2020,59(6):2323-2327
Organothiol monolayers on metal substrates (Au, Ag, Cu) and their use in a wide variety of applications have been extensively studied. Here, the growth of layers of organothiols directly onto muscovite mica is demonstrated using a simple procedure. Atomic force microscopy, surface X‐ray diffraction, and vibrational sum‐frequency generation IR spectroscopy studies revealed that organothiols with various functional endgroups could be self‐assembled into (water) stable and adaptable ultra‐flat organothiol monolayers over homogenous areas as large as 1 cm2. The strength of the mica–organothiol interactions could be tuned by exchanging the potassium surface ions for copper ions. Several of these organothiol monolayers were subsequently used as a template for calcite growth. 相似文献
96.
97.
Quantitative methods for food allergens: a review 总被引:1,自引:0,他引:1
Stéphanie Kirsch Séverine Fourdrilis Rowan Dobson Marie-Louise Scippo Guy Maghuin-Rogister Edwin De Pauw 《Analytical and bioanalytical chemistry》2009,395(1):57-67
The quantitative detection of allergens in the food chain is a strategic health objective as the prevalence of allergy continues
to rise. Food allergenicity is caused by proteins either in their native form or in forms resulting from food processing.
Progress in mass spectrometry greatly opened up the field of proteomics. These advances are now available for the detection
and the quantification of traces of allergenic proteins in complex mixtures, and complete the set of biological tests used
until now, such as ELISA or PCR. We review methods classified according to their ability to simultaneously quantify and identify
allergenic proteins and underline major advances in the mass-spectrometric methods.
Stéphanie Kirsch and Séverine Fourdrilis contributed equally to this paper. 相似文献
98.
Nicole Hondow Rik Brydson Peiyi Wang Mark D. Holton M. Rowan Brown Paul Rees Huw D. Summers Andy Brown 《Journal of nanoparticle research》2012,14(7):1-15
The electronics industry is one of the world??s fastest growing manufacturing industries. However, e-waste has become a serious pollution problem. This study reports the recovery of e-waste for preparing valuable MCM-48 and ordered mesoporous carbon for the first time. Specifically, this study adopts an alkali-extracted method to obtain sodium silicate precursors from electronic packaging resin ash. The influence of synthesis variables such as gelation pH, neutral/cationic surfactant ratio, hydrothermal treatment temperature, and calcination temperature on the mesophase of MCM-48 materials is investigated. Experimental results confirm that well-ordered cubic MCM-48 materials were synthesized in strongly acidic and strongly basic media. The resulting mesoporous silica had a high surface area of 1,317?m2/g, mean pore size of about 3.0?nm, and a high purity of 99.87?wt%. Ordered mesoporous carbon with high surface area (1,715?m2/g) and uniform pore size of CMK-1 type was successfully prepared by impregnating MCM-48 template using the resin waste. The carbon structure was sensitive to the sulfuric acid concentration and carbonization temperature. Converting e-waste into MCM-48 materials not only eliminates the disposal problem of e-waste, but also transforms industrial waste into a useful nanomaterial. 相似文献
99.
Artur CG Miller R Meyer M Le Ru EC Etchegoin PG 《Physical chemistry chemical physics : PCCP》2012,14(9):3219-3225
Single-molecule Surface-Enhanced Raman Scattering (SERS) detection of buckminsterfullerene (C(60)) is achieved by using different isotopologues of the molecule with a distribution around an average isotopic substitution ((12)C → (13)C) of ~30%. The distribution of different isotopologues creates a broad (~20 cm(-1)) average SERS signal within which single-molecule SERS spectra of individual isotopic realizations of the molecule can be distinguished. The SERS enhancement factors for SM-SERS C(60) events are typically in the range of ~10(8), suggesting a limitation imposed by either photobleaching or surface interactions with the (Ag) metallic colloids to reach the highest SERS hot-spots (which can typically have larger maximum enhancements). SM-SERS signals of isotopically substituted C(60) also show broader peaks (FWHM ≈ 4 cm(-1)) than equivalent signals in natural C(60). The latter feature suggests a contribution to the homogeneous broadening coming from isotopic disorder in the molecule; a feature that can only be observed with the ability to detect single-molecule spectra. 相似文献
100.
Hetterscheid DG Hendriksen C Dzik WI Smits JM van Eck ER Rowan AE Busico V Vacatello M Van Axel Castelli V Segre A Jellema E Bloemberg TG de Bruin B 《Journal of the American Chemical Society》2006,128(30):9746-9752
Unprecedented rhodium-catalyzed stereoselective polymerization of "carbenes" from ethyl diazoacetate (EDA) to give high molecular mass poly(ethyl 2-ylidene-acetate) is described. The mononuclear, neutral [(N,O-ligand)M(I)(cod)] (M = Rh, Ir) catalytic precursors for this reaction are characterized by (among others) single-crystal X-ray diffraction. These species mediate formation of a new type of polymers from EDA: carbon-chain polymers functionalized with a polar substituent at each carbon of the polymer backbone. The polymers are obtained as white powders with surprisingly sharp NMR resonances. Solution and solid state NMR data for these new polymers reveal a highly stereoregular polymer, with a high degree of crystallinity. The polymer is likely syndiotactic. Material properties are very different from those of atactic poly(diethyl fumarate) polymer obtained by radical polymerization of diethyl fumarate. Other diazoacetates are also polymerized. Further studies are underway to reveal possible applications of these new materials. 相似文献