Alignment Process for Glass Substrates Using Electrostatic Self-Assembly

2021 ◽  
pp. 448-456
Author(s):  
Martin Stucki ◽  
Christoph Schumann ◽  
Annika Raatz
Keyword(s):  
Self Assembly ◽  
Glass Substrates ◽  
Alignment Process

Biomolecular self-assembly of micrometer sized silica beads on patterned glass substrates

2009 ◽  
Vol 255 (17) ◽  
pp. 7759-7765 ◽  
Author(s):  
Martin Alberti ◽  
Erwin Yacoub-George ◽  
Waltraud Hell ◽  
Christof Landesberger ◽  
Karlheinz Bock
Keyword(s):  
Self Assembly ◽  
Glass Substrates ◽  
Silica Beads

scholarly journals Formation of Hierarchical Porous Films with Breath-Figures Self-Assembly Performed on Oil-Lubricated Substrates

Materials ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 3051 ◽  
Author(s):  
Edward Bormashenko ◽  
Yelena Bormashenko ◽  
Mark Frenkel
Keyword(s):  
Self Assembly ◽  
Large Scale ◽  
Silicone Oil ◽  
Contact Angles ◽  
Porous Films ◽  
Voronoi Tessellations ◽  
Breath Figures ◽  
Glass Substrates ◽  
Industrial Grade ◽  
Hierarchical Porous

Hierarchical honeycomb patterns were manufactured with breath-figures self-assembly by drop-casting on the silicone oil-lubricated glass substrates. Silicone oil promoted spreading of the polymer solution. The process was carried out with industrial grade polystyrene and polystyrene with molecular mass M w = 35 , 000 g m o l . Both polymers gave rise to patterns, built of micro and nano-scaled pores. The typical diameter of the nanopores was established as 125 nm. The mechanism of the formation of hierarchical patterns was suggested. Ordering of the pores was quantified with the Voronoi tessellations and calculation of the Voronoi entropy. The Voronoi entropy for the large scale pattern was S v o r = 0.6 − 0.9 , evidencing the ordering of pores. Measurement of the apparent contact angles evidenced the Cassie-Baxter wetting regime of the porous films.

Characterization Of SnO2 Nanoparticles Deposited Via Layer-by-Layer Self Assembly And Investigation Of Their Sensing Properties

2002 ◽  
Vol 739 ◽  
Author(s):  
R. C. Ghan ◽  
Y. Lvov ◽  
R. S. Besser
Keyword(s):  
Self Assembly ◽  
High Selectivity ◽  
Sno2 Nanoparticles ◽  
Test Chamber ◽  
The Self ◽  
Layer By Layer ◽  
Product Analysis ◽  
Glass Substrates ◽  
Self Assembled

ABSTRACTA technique of Layer-by-Layer (LbL) self-assembly is used to deposit SnO2 nanoparticles on Quartz Crystal Microbalance (QCM) resonators, and on glass substrates which the authors believe has not been previously reported. Characterization of self-assembled SnO2 layers has been performed using QCM, Scanning Electron Microscopy (SEM), and Zeta Potential analysis.We have successfully deposited SnO2 nanoparticles on QCM resonator using self-assembly technique. LbL self-assembly is a method of organization of ultra-thin films by interlayer electrostatic attraction. The thickness and mass of the self-assembled layers can be characterized by the frequency shift obtained using the QCM and empirical equations relating change in frequency with mass and thickness of deposited layers. The deposition of SnO2 nanolayers exhibited a linear reproducibility and the process of self-assembly was independent of the residence time of QCM resonator in the SnO2 nanoparticle colloidal solution. High resolution SEM analysis reveals that the SnO2 nanoparticle layers are uniformly deposited across the entire substrate. Electrical characterization was performed on SnO2 nanoparticle layers self-assembled on glass substrates which were patterned for two point (current-voltage) IV characteristic measurements. Two classes of samples were used. One sample was self-assembled glass substrate patterned with electrical contacts and calcined (baked at 350°C for one hour) to eliminate interlayered polyions and the other sample was not calcined. Results revealed that the calcined samples demonstrated linear ohmic behavior but the uncalcined showed some spurious points which we believe are due to the polyion layers.Characterization of the self-assembled SnO2 nanoparticles is being carried out with the intention of fabricating a high-selectivity μ-gas sensor. A test chamber has been fabricated and results of resistance behavior of the sensor with variation in temperature have been presented.The sensor can find applications in high selectivity sensing of chemical, industrial, domestic, and hazardous environments. After further research and development, this μ-gas sensors could be made generic to sense a variety of gases and employed for integrated on-chip product analysis in multiple chemical microsystem applications.

scholarly journals Quantification of Optical Chirality in Cellulose Nanocrystal Films Prepared by Shear-Coating

2021 ◽  
Vol 11 (13) ◽  
pp. 6191
Author(s):  
Olga Rubí Juárez-Rivera ◽  
Reina Araceli Mauricio-Sánchez ◽  
Kenneth Järrendahl ◽  
Hans Arwin ◽  
Arturo Mendoza-Galván
Keyword(s):  
Self Assembly ◽  
Polarized Light ◽  
Mueller Matrix ◽  
Cellulose Nanocrystal ◽  
Free Standing ◽  
Full Characterization ◽  
Glass Substrates ◽  
Left Handed ◽  
Optical Chirality ◽  
Transmission Modes

Evaporation-induced-self-assembly is widely used to produce chiral cellulose nanocrystal (CNC) free-standing films reflecting left-handed polarized light. Research on supported chiral CNC films is rather scarce. The reflection and/or transmission of unpolarized light are the most common optical techniques used to characterize the selective reflection of CNC films whereas the use of techniques to quantify chiral properties is limited. Here, the fabrication of chiral CNC films supported on glass substrates by a shear-coating method, as well as a full characterization of their polarization properties, are reported. Optical chirality is evidenced in films, showing a brilliant blue structural color when viewed through a left-handed polarizer and darkness through a right-handed polarizer. Mueller-matrix data in the reflection and transmission modes are used to quantitatively characterize the structural origin of color in the films. The quantification of the linear and circular birefringence, as well as circular dichroism, is performed by analytical inversion of the Mueller matrix data in the transmission mode and regression analysis using Tellegen constitutive equations. The equivalence of the two methods to quantify the structural chirality in CNC films is demonstrated. The swelling of films in water and kinetics during drying is studied by reflection spectroscopy.

scholarly journals Formation of Hierarchical Porous Films with Breath-Figures Self-Assembly Performed on Oil-Lubricated Substrates

2019 ◽  
Author(s):  
Edward Bormashenko ◽  
Yelena Bormashenko ◽  
Mark Frenkel
Keyword(s):  
Self Assembly ◽  
Silicone Oil ◽  
Contact Angles ◽  
Porous Films ◽  
Voronoi Tessellations ◽  
Breath Figures ◽  
Glass Substrates ◽  
Industrial Grade ◽  
Hierarchical Porous ◽  
Entropy Measurement

Hierarchical honeycomb patterns were manufactured with the breath-figures self-assembly by drop-casting on the silicone-oil lubricated glass substrates. Silicone oil promoted spreading of the polymer solutions. The process was carried out with the industrial grade polystyrene and polystyrene with the molecular weight Mw=35.000. Both of polymers gave rise to the patterns, built from micro- and nano-scaled pores. Ordering of the pores was quantified with the Voronoi tessellations and calculating the Voronoi entropy. Measurement of the apparent contact angles evidenced the Cassie - Baxter wetting regime of the porous films.

Self-Assembly Strategy for Reducing Non-Specific Adsorption on Substrates and Application for Quantitative Immunoassay

2021 ◽  
Author(s):  
Yanbing lv ◽  
Man Zhao ◽  
Jinjin Fan ◽  
Ruili Wu ◽  
Yanxia Xu ◽  
...  
Keyword(s):  
Self Assembly ◽  
Glass Substrate ◽  
Limit Of Detection ◽  
Substrate Surface ◽  
High Sensitivity ◽  
Specific Adsorption ◽  
Quantitative Detection ◽  
Glass Substrates ◽  
Functionalized Surfaces ◽  
Substrate Surfaces

Abstract Background The development of functionalized surfaces with low non-specific adsorption is important for biomedical applications. To inhibit non-specific adsorption on a substrate, we prepared a novel optical biochip based on a quantum dot fluorescence immunosorbent assay (QD-FLISA), specifically by modifying a layer of dense negatively charged film (SO32−) on the glass substrate surface via self-assembly. Results Using optimized conditions, we constructed a biochip on functionalized glass substrates to achieve quantitative detection of C-reactive protein (CRP). We subsequently achieved quantitative determination of CRP in the range of 1-1,000 ng/mL, with a limit of detection (LOD) of 1.26 ng/mL or 5.17 ng/mL, using poly(styrene sulfonic acid) sodium salt (PSS) or meso-tetra (4-sulfonatophenyl) porphine dihydrochloride (TSPP) on individually modified glass substrate biochips. The experimental protocol was further optimized and the LOD achieved a sensitivity of 0.69 ng/mL using functionalized TSPP and PSS co-treated glass substrate surfaces for the quantitative detection of CRP. Conclusions This work demonstrated an effective and convenient strategy to obtain biochips with low non-specific adsorption properties on functionalized surfaces, thus providing a new approach for creating ultra-high sensitivity microchannels or microarrays on glass substrates.

Self-Assembled Optical Gratings with Banana-Shaped Liquid Crystals

2010 ◽  
Vol 428-429 ◽  
pp. 12-23 ◽  
Author(s):  
Yuan Ming Huang
Keyword(s):  
Liquid Crystals ◽  
Self Assembly ◽  
Red Light ◽  
Diffraction Gratings ◽  
The Self ◽  
Two Dimensional ◽  
Glass Substrates ◽  
Self Assembled ◽  
Optical Gratings ◽  
Diffraction Patterns

We demonstrated that a homologous series of banana-shaped liquid crystals, 1,3-phenylene bis(4-alkyloxybenzylideneamine), could assemble themselves into various kinds of groove-free diffraction gratings when their isotropic melts were slowly cooled into mesophases between two pieces of glass substrates. The groove-free diffraction gratings included one-dimensional parallel gratings, two-dimensional crossed gratings, two-dimensional fan-shaped gratings and two-dimensional circular gratings. Characterization by means of polarized optical microscopy showed that a pattern of periodic modulation of the refractive index was developed in the thin films formed by the banana-shaped compound. Our laser light diffraction experiments confirmed that these groove-free gratings could effectively diffract the incident red light from a helium-neon laser. On the basis of the diffraction equations derived for the self-assembled groove-free optical gratings, the diffraction patterns were simulated for the parallel gratings, orthogonally crossed gratings, fan-shaped gratings and circular gratings, respectively, and good agreement was achieved. The mechanisms on the self-assembly of the banana-shaped molecules were discussed in terms of intermolecular interactions. Our work provides an alternative method for manufacturing diffraction gratings by harnessing the self-assembly of banana-shaped molecules.

Groove-Free Optical Gratings Self-Assembled by Banana-Shaped Molecules

2010 ◽  
Vol 428-429 ◽  
pp. 272-275
Author(s):  
Yuan Ming Huang ◽  
Qing Lan Ma ◽  
Bao Gai Zhai
Keyword(s):  
Thin Films ◽  
Refractive Index ◽  
Optical Properties ◽  
Self Assembly ◽  
Room Temperature ◽  
Diffraction Gratings ◽  
The Self ◽  
Periodic Modulation ◽  
Glass Substrates ◽  
Alternative Method

. We demonstrate that banana-shaped molecules 1,3-phenylene bis(4-methoxybenzylidene amine) can assemble themselves into diffraction gratings when the melt of the banana-shaped compound, which was sandwiched between two pieces of glass substrates, is cooled to room temperature. Polarizing optical microscopic characterization shows that a pattern of periodic modulation of the refractive index can be developed in the thin films formed by the banana-shaped compound. Despite the gratings are groove free, their optical properties are the same as classically ruled gratings. Our work provides an alternative method for manufacturing diffraction gratings by harnessing the self-assembly of banana-shaped molecules.

scholarly journals Control over Vertical Orientation of Liquid Crystal using Spin Coated Silica Nanoparticles Layer on Conductive Substrates

2021 ◽  
Vol 2070 (1) ◽  
pp. 012039
Author(s):  
Ankit Rai Dogra ◽  
Vandna Sharma ◽  
Partha Khanra ◽  
Pankaj Kumar
Keyword(s):  
Indium Tin Oxide ◽  
Self Assembly ◽  
Contrast Ratio ◽  
Chemical Vapour ◽  
Vertical Orientation ◽  
Glass Substrates ◽  
Capillary Method ◽  
Electro Optic ◽  
Ito Glass ◽  
Conductive Substrates

Abstract Recently, various techniques such as self-assembly, chemical vapour deposition and capillary method etc. are used for nanoparticles (NPs) deposition on the conductive substrates for the vertical alignment (VA) of liquid crystals (LCs). The initial VA of LCs in display devices have the potential impact on industry and various electro-optic devices applications. In the present work, vertical orientation of LCs was controlled on silica (SiO2) nanoparticles (NPs) layer deposited on indium tin oxide (ITO) glass substrates using spin coating method. The VA LC cell was also prepared for conventional polyimide coated ITO glass substrates. The morphological images showed the initial darker textures under crossed polarizers and conoscopic image with dark cross confirmed the VA of LC on SiO2 NPs coated substrates analogous to the conventional VA LC cell. Further, electro-optic results revealed the reduction in applied voltage and better contrast ratio for SiO2 NPs coated VA LC cell compared with polyimide coated VA LC cell.

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