Self-Assembly Film of Zeolite Y Nanocrystals Loading Palladium on an Au Electrode for Electrochemical Applications

2006 ◽  
Vol 18 (12) ◽  
pp. 1173-1178 ◽  
Author(s):  
Yan-Xia Jiang ◽  
Di Si ◽  
Sheng-Pei Chen ◽  
Shi-Gang Sun
Keyword(s):  
Self Assembly ◽  
Zeolite Y ◽  
Au Electrode ◽  
Electrochemical Applications

Zeolates: A Coordination Chemistry View of Metal-Ligand Bonding in Intrazeolite MOCVD Type Precursors and Semiconductor Nanoclusters

1992 ◽  
Vol 277 ◽  
Author(s):  
Geoffrey A. Ozin ◽  
Carol L. Bowes ◽  
Mark R. Steele
Keyword(s):  
Self Assembly ◽  
Materials Science ◽  
Zeolite Y ◽  
Chemical Vapour ◽  
Internal Surface ◽  
Building Blocks ◽  
Structural Features ◽  
Organic Chemical ◽  
Wide Range ◽  
Shape Selective

ABSTRACTVarious MOCVD (metal-organic chemical vapour deposition) type precursors and their self-assembled semiconductor nanocluster products [1] have been investigated in zeolite Y hosts. From analysis of in situ observations (FTIR, UV-vis reflectance, Mössbauer, MAS-NMR) of the reaction sequences and structural features of the precursors and products (EXAFS and Rietveld refinement of powder XRD data) the zeolite is viewed as providing a macrospheroidal, multidendate coordination environment towards encapsulated guests. By thinking about the α- and β-cages of the zeolite Y host effectively as a zeolate ligand composed of interconnected aluminosilicate “crown ether-like” building blocks, the materials chemist is able to better understand and exploit the reactivity and coordination properties of the zeolite internal surface for the anchoring and self-assembly of a wide range of encapsulated guests. This approach helps with the design of synthetic strategies for creating novel guest-host inclusion compounds having possible applications in areas of materials science such as nonlinear optics, quantum electronics, and size/shape selective catalysis.

The preparation of polyaniline/gold nanocomposites by self-assembly and their electrochemical applications

2010 ◽  
Vol 70 (9) ◽  
pp. 663-668 ◽  
Author(s):  
Qin Xu ◽  
Jun Leng ◽  
Hong-bo Li ◽  
Gui-ju Lu ◽  
Yang Wang ◽  
...  
Keyword(s):  
Self Assembly ◽  
Electrochemical Applications ◽  
Gold Nanocomposites

Electrochemical characteristic of Selenocysteine Self-assembly monolayers at Au electrode

2011 ◽  
Vol 657 (1-2) ◽  
pp. 74-78 ◽  
Author(s):  
Tingting Wang ◽  
Yan Bai ◽  
Haiying Luo ◽  
Xiaoli Yan ◽  
Wenjie Zheng
Keyword(s):  
Self Assembly ◽  
Electrochemical Characteristic ◽  
Au Electrode

Flow injection amperometric sensing of uric acid and ascorbic acid using the self-assembly of heterocyclic thiol on Au electrode

2011 ◽  
Vol 16 (1) ◽  
pp. 173-178 ◽  
Author(s):  
Ramendra Sundar Dey ◽  
Susmita Gupta ◽  
Rupankar Paira ◽  
Shen-Ming Chen ◽  
C. Retna Raj
Keyword(s):  
Ascorbic Acid ◽  
Uric Acid ◽  
Flow Injection ◽  
Self Assembly ◽  
The Self ◽  
Au Electrode ◽  
Amperometric Sensing

scholarly journals Chemically controlled interfacial nanoparticle assembly into nanoporous gold films for electrochemical applications

2018 ◽  
Vol 6 (2) ◽  
pp. 556-564 ◽  
Author(s):  
Mikkel U.-B. Christiansen ◽  
Nedjeljko Seselj ◽  
Christian Engelbrekt ◽  
Michal Wagner ◽  
Frederick N. Stappen ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Self Assembly ◽  
Nanoporous Gold ◽  
Nanoparticle Assembly ◽  
Gold Films ◽  
Electrochemical Applications ◽  
Air Interface

Nanoporous gold (NPG) is an effective material for electrocatalysis and can be made by self-assembly of gold nanoparticles at liquid–air interface.

Self-Assembled Au Electrode for Direct Electrochemistry of Horseradish Peroxidase and Detection of Hydrogen Peroxide

2013 ◽  
Vol 704 ◽  
pp. 72-76
Author(s):  
Han Cui ◽  
Zhao Hao Wang ◽  
Qi Jin Wan ◽  
Nian Jun Yang
Keyword(s):  
Horseradish Peroxidase ◽  
Self Assembly ◽  
Dynamic Range ◽  
Electrochemical Impedance ◽  
Saturated Calomel Electrode ◽  
Direct Electrochemistry ◽  
Buffer Solution ◽  
Cyclic Voltammetric ◽  
Continuous Processes ◽  
Au Electrode

The H2O2 biosensor was prepared by continuous processes: 2,3-dimercaptosuccinic acid (DMSA) self-assembly monolayers gold nanoparticles (AuNPs) film by electrodepositioncovalent immobilization of horseradish peroxidase (HRP). In pH 7.2 phosphoric buffer solution (PBS), the HRP-AuNPs-DMSA-Au electrode exhibited a pair of well-defined cyclic voltammetric peaks in H2O2 solution, and the oxidation peak is about +0.4V versus saturated calomel electrode (SCE). The resulting substrates were characterized by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The biosensor exhibited remarkable sensitivity towards H2O2 and a wide dynamic range of 2-800 μM. The electrode retained 90% of its initial activity after 30 days of storage at 4°C.

On-chip integration of novel Au electrode with a higher order three-dimensional layer stack nanostructure for surface-enhanced Raman spectroscopy

RSC Advances ◽  
2015 ◽  
Vol 5 (89) ◽  
pp. 73194-73201 ◽  
Author(s):  
Akinobu Yamaguchi ◽  
Takao Fukuoka ◽  
Ryohei Hara ◽  
Kazuhisa Kuroda ◽  
Ryo Takahashi ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Self Assembly ◽  
Three Dimensional ◽  
Surface Enhanced Raman Spectroscopy ◽  
Higher Order ◽  
Au Electrode ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
On Chip

We develop a novel in situ surface-enhanced Raman spectroscopy (SERS) platform with three-dimensional nanostructure gold electrodes using the competitive self-assembly between dielectrophoresis and convective aggregation.

In vitro and in vivo polysaccharides assembly: ultrastructural and cytochemical study of growing plant cell wall components.

1978 ◽  
Vol 36 (2) ◽  
pp. 434-435
Author(s):  
D. Reis ◽  
B. Vian ◽  
J. C. Roland
Keyword(s):  
Cell Wall ◽  
Self Assembly ◽  
Plant Cell Wall ◽  
Higher Plants ◽  
Three Dimensional ◽  
Cytochemical Study ◽  
Wall Components

Wall morphogenesis in higher plants is a problem still open to controversy. Until now the possibility of a transmembrane control and the involvement of microtubules were mostly envisaged. Self-assembly processes have been observed in the case of walls of Chlamydomonas and bacteria. Spontaneous gelling interactions between xanthan and galactomannan from Ceratonia have been analyzed very recently. The present work provides indications that some processes of spontaneous aggregation could occur in higher plants during the formation and expansion of cell wall.Observations were performed on hypocotyl of mung bean (Phaseolus aureus) for which growth characteristics and wall composition have been previously defined.In situ, the walls of actively growing cells (primary walls) show an ordered three-dimensional organization (fig. 1). The wall is typically polylamellate with multifibrillar layers alternately transverse and longitudinal. Between these layers intermediate strata exist in which the orientation of microfibrils progressively rotates. Thus a progressive change in the morphogenetic activity occurs.

The Nature of Rapidly Extracted Phycocyanin from the Blue-Green Alga Plectonema Boryanum

1971 ◽  
Vol 29 ◽  
pp. 366-367
Author(s):  
M. Kessel ◽  
R. MacColl
Keyword(s):  
Self Assembly ◽  
Analytical Ultracentrifugation ◽  
Uranyl Acetate ◽  
The Self ◽  
Major Protein ◽  
Subunit Structure ◽  
Blue Green Alga ◽  
Thin Sections ◽  
Blue Green Algae ◽  
Cacodylate Buffer

The major protein of the blue-green algae is the biliprotein, C-phycocyanin (Amax = 620 nm), which is presumed to exist in the cell in the form of distinct aggregates called phycobilisomes. The self-assembly of C-phycocyanin from monomer to hexamer has been extensively studied, but the proposed next step in the assembly of a phycobilisome, the formation of 19s subunits, is completely unknown. We have used electron microscopy and analytical ultracentrifugation in combination with a method for rapid and gentle extraction of phycocyanin to study its subunit structure and assembly.To establish the existence of phycobilisomes, cells of P. boryanum in the log phase of growth, growing at a light intensity of 200 foot candles, were fixed in 2% glutaraldehyde in 0.1M cacodylate buffer, pH 7.0, for 3 hours at 4°C. The cells were post-fixed in 1% OsO4 in the same buffer overnight. Material was stained for 1 hour in uranyl acetate (1%), dehydrated and embedded in araldite and examined in thin sections.

Video real-time imaging of artificial membranes during freeze-drying by cryo-electron microscopy

1988 ◽  
Vol 46 ◽  
pp. 16-17
Author(s):  
Alan S. Rudolph ◽  
Ronald R. Price
Keyword(s):  
Real Time ◽  
Self Assembly ◽  
Freeze Drying ◽  
Video Capture ◽  
Drying Process ◽  
Artificial Membranes ◽  
The Past ◽  
Cryo Electron Microscopy ◽  
Spherical Structures ◽  
Capture Techniques

We have employed cryoelectron microscopy to visualize events that occur during the freeze-drying of artificial membranes by employing real time video capture techniques. Artificial membranes or liposomes which are spherical structures within internal aqueous space are stabilized by water which provides the driving force for spontaneous self-assembly of these structures. Previous assays of damage to these structures which are induced by freeze drying reveal that the two principal deleterious events that occur are 1) fusion of liposomes and 2) leakage of contents trapped within the liposome [1]. In the past the only way to access these events was to examine the liposomes following the dehydration event. This technique allows the event to be monitored in real time as the liposomes destabilize and as water is sublimed at cryo temperatures in the vacuum of the microscope. The method by which liposomes are compromised by freeze-drying are largely unknown. This technique has shown that cryo-protectants such as glycerol and carbohydrates are able to maintain liposomal structure throughout the drying process.

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