Self-assembly of colloidal sulfur particles influenced by sodium oxalate salt on glass surface from evaporating drops

Soft Matter ◽  
2012 ◽  
Vol 8 (14) ◽  
pp. 3771 ◽  
Author(s):  
Naveen Noah Jason ◽  
Rajib Ghosh Chaudhuri ◽  
Santanu Paria
Keyword(s):  
Self Assembly ◽  
Glass Surface ◽  
Sodium Oxalate ◽  
Colloidal Sulfur ◽  
Evaporating Drops

Self-assembly of colloidal sulfur particles on a glass surface from evaporating sessile drops: influence of different salts

2014 ◽  
Vol 38 (12) ◽  
pp. 5943-5951 ◽  
Author(s):  
Santanu Paria ◽  
Rajib Ghosh Chaudhuri ◽  
Naveen Noah Jason
Keyword(s):  
Self Assembly ◽  
Glass Surface ◽  
Colloidal Sulfur ◽  
Sessile Drops

Laser Sub-Micron Patterning of Rough Surfaces by Micro-Particle Lens Arrays

2011 ◽  
Vol 1 (3) ◽  
pp. 1-9 ◽  
Author(s):  
Ashfaq Khan ◽  
Zengbo Wang ◽  
Mohammad A Sheikh ◽  
Lin Li
Keyword(s):  
Rough Surface ◽  
Self Assembly ◽  
Glass Surface ◽  
Rough Surfaces ◽  
Flat Glass ◽  
Surface Patterning ◽  
Laser Surface ◽  
New Method ◽  
Experimental Investigations ◽  
Sio2 Spheres

Laser surface patterning by Contact Particles Lens Arrays (CPLA) has been widely utilized for patterning of smooth surfaces but there is no technique developed by which CPLA can be deposited on a rough surface. For deposition of CPLA, conventional techniques require the surface to be flat, smooth and hydrophilic. In this study, a new method for the deposition of CPLA on a rough surface is proposed and utilized for patterning. In this method, a hexagonal closed pack monolayer of SiO2 spheres was first formed by self-assembly on a flat glass surface. The formed monolayer of particles was picked up by a flexible sticky surface and then placed on the rough surface to be patterned. A Nd:YVO4 laser was used to irradiate the substrate with the laser passing through the sticky plastic and the particles. Experimental investigations have been carried out to determine the properties of the patterns.

scholarly journals Nanocoatings of Bovine Serum Albumin on Glass: Effects of pH and Temperature

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Sergio-Miguel Acuña-Nelson ◽  
José-Miguel Bastías-Montes ◽  
Fabiola-Rossana Cerda-Leal ◽  
Julio-Enrique Parra-Flores ◽  
Juan-Salvador Aguirre-García ◽  
...  
Keyword(s):  
Bovine Serum Albumin ◽  
Serum Albumin ◽  
Self Assembly ◽  
Glass Surface ◽  
Bovine Serum ◽  
Electrostatic Interactions ◽  
Dynamic Contact ◽  
Dlvo Theory ◽  
Contact Angles ◽  
Protein Size

Protein adsorption is influenced by many factors such as temperature, pH, protein size and structure, or surface energy and roughness, among others. Self-assembled monolayers (SAMs) and the Langmuir-Blodgett (LB) technique are two of the techniques more used to produces ultrathin films of proteins on surfaces. In this work, we established protocols for the preparation of nanocoatings of bovine serum albumin (BSA) protein on glass surface using SAMs and LB. Furthermore, we determined how small changes in temperature and pH can affect the covering when SAMs are used. Using a combination of different analyses, such as relative roughness, dynamic contact angles, and atomic force microscopy (AFM), it was possible to establish conditions to obtain a uniform nanocoating using SAMs. The results of the analysis of the nanocoating performed using the LB technique were very similar to those obtained using SAMs. The Derjaguin–Landau–Verwey–Overbeek (DLVO) theory in conjunction with the AFM images showed that electrostatic interactions are very important in the self-assembly process, but a process dominated solely by attraction is not sufficient to achieve a good SAM nanocoating, since it does not allow proper orientation and packaging of BSA molecules on the glass surface.

Suppressing the coffee stain effect: how to control colloidal self-assembly in evaporating drops using electrowetting

Soft Matter ◽  
2011 ◽  
Vol 7 (10) ◽  
pp. 4954 ◽  
Author(s):  
H. B. Eral ◽  
D. Mampallil Augustine ◽  
M. H. G. Duits ◽  
F. Mugele
Keyword(s):  
Self Assembly ◽  
Evaporating Drops

Size-Discriminative Self-Assembly of Nanospheres in Evaporating Drops

2004 ◽  
Vol 108 (1) ◽  
pp. 8-10 ◽  
Author(s):  
Andrei P. Sommer ◽  
Matti Ben-Moshe ◽  
Shlomo Magdassi
Keyword(s):  
Self Assembly ◽  
Evaporating Drops

Laser Sub-Micron Patterning of Rough Surfaces by Micro-Particle Lens Arrays

2012 ◽  
pp. 130-139
Author(s):  
Ashfaq Khan ◽  
Zengbo Wang ◽  
Mohammad A Sheikh ◽  
Lin Li
Keyword(s):  
Rough Surface ◽  
Self Assembly ◽  
Glass Surface ◽  
Rough Surfaces ◽  
Flat Glass ◽  
Surface Patterning ◽  
Laser Surface ◽  
New Method ◽  
Experimental Investigations ◽  
Sio2 Spheres

Laser surface patterning by Contact Particles Lens Arrays (CPLA) has been widely utilized for patterning of smooth surfaces but there is no technique developed by which CPLA can be deposited on a rough surface. For deposition of CPLA, conventional techniques require the surface to be flat, smooth and hydrophilic. In this study, a new method for the deposition of CPLA on a rough surface is proposed and utilized for patterning. In this method, a hexagonal closed pack monolayer of SiO2 spheres was first formed by self-assembly on a flat glass surface. The formed monolayer of particles was picked up by a flexible sticky surface and then placed on the rough surface to be patterned. A Nd:YVO4 laser was used to irradiate the substrate with the laser passing through the sticky plastic and the particles. Experimental investigations have been carried out to determine the properties of the patterns.

C60Clusters Self-Assembly in One-beam Optical Trap

2001 ◽  
Vol 675 ◽  
Author(s):  
W. Eugene Collins ◽  
Weijie Lu ◽  
Steven Morgan ◽  
Andrey Zavalin
Keyword(s):  
Self Assembly ◽  
Glass Surface ◽  
Optical Trap

ABSTRACTC60aggregated clusters up to 20 um length were created on a glass surface within a solution inside of a gradient one-beam optical trap. It was possible to grow rod-shaped structures by motion of an optical trap parallel to the surface of the substrate. After the deposited structures became stable, the solution was dried. By AFM measurements of the stable dried structures, it was shown, that aggregations have typical sizes of 5–15 um X 1.5–2 um, and thickness near 1.5 um. The aggregations consist of thinner (30–100 nm diameter) rods, bundled together.

scholarly journals Photostability ofJ-aggregates adsorbed onTiO2nanoparticles and AFM imaging ofJ-aggregates on a glass surface

2004 ◽  
Vol 6 (1) ◽  
pp. 29-33 ◽  
Author(s):  
Mohamed M. S. Abdel-Mottaleb ◽  
Mark Van der Auweraer ◽  
Mohamed S. A. Abdel-Mottaleb
Keyword(s):  
Self Assembly ◽  
Glass Surface ◽  
Spectral Properties ◽  
Helical Structure ◽  
The Self ◽  
Nano Particles ◽  
Dye Molecules ◽  
Force Microscopy ◽  
Atomic Force ◽  
Afm Imaging

Spectral properties and photostability of the 5,5’-6,6‘-tetrachloro-1,1‘-dioctyl-3,3‘-bis-(3-carboxypropyl)- benzimidacarbocyanine (Dye1)J-aggregate was investigated in solution and upon adsorption onTiO2nano-particles. Dye1was found to photodegrade on the surface ofTiO2. Additionally, the self-assembly of Dye1was studied on a glass surface by non-contact atomic force microscopy (NCAFM). The dye molecules form a well-defined fiber like structure that extends for tens of micrometers. The internal structure of the fibers was clearly resolved and showed a number of small tubes wrapped around each other to form a helical structure.

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.

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