scholarly journals Lipid-Coating on Polyamide Microcapsules Having Long Alkyl Chains and the Characterization of the Lipid-Coated Surface

1989 ◽  
Vol 62 (11) ◽  
pp. 3587-3592 ◽  
Author(s):  
Kenji Kono ◽  
Shunsaku Kimura ◽  
Yukio Imanishi
Keyword(s):  
Alkyl Chains ◽  
Coated Surface

scholarly journals Crystal structure of thermostable alkylsulfatase SdsAP from Pseudomonas sp. S9

2017 ◽  
Vol 37 (3) ◽  
Author(s):  
Lifang Sun ◽  
Pu Chen ◽  
Yintao Su ◽  
Zhixiong Cai ◽  
Lingwei Ruan ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Sodium Dodecyl ◽  
Titration Calorimetry ◽  
Pseudomonas Sp ◽  
Sterol Carrier Protein ◽  
Dimerization Domain ◽  
Alkyl Chains ◽  
Hydrolysis Of

A novel alkylsulfatase from bacterium Pseudomonas sp. S9 (SdsAP) was identified as a thermostable alkylsulfatases (type III), which could hydrolyze the primary alkyl sulfate such as sodium dodecyl sulfate (SDS). Thus, it has a potential application of SDS biodegradation. The crystal structure of SdsAP has been solved to a resolution of 1.76 Å and reveals that SdsAP contains the characteristic metallo-β-lactamase-like fold domain, dimerization domain, and C-terminal sterol carrier protein type 2 (SCP-2)-like fold domain. Kinetic characterization of SdsAP to SDS by isothermal titration calorimetry (ITC) and enzymatic activity assays of constructed mutants demonstrate that Y246 and G263 are important residues for its preference for the hydrolysis of ‘primary alkyl’ chains, confirming that SdsAP is a primary alkylsulfatase.

Development of Chemical Conversion Coating for Blackening of a Grade of Stainless Steel Useful for Fabrication of Optical Devices

2017 ◽  
Vol 32 (3-4) ◽  
pp. 99
Author(s):  
Lakhi Ram Chauhan ◽  
Majar Singh ◽  
J. K. Bajpai ◽  
Kshipra Misra ◽  
Amit Agarwal
Keyword(s):  
Stainless Steel ◽  
Sea Water ◽  
Chemical Conversion ◽  
Conversion Coating ◽  
Indentation Hardness ◽  
Economical Aspect ◽  
Coated Surface ◽  
Chemical Conversion Coating ◽  
Set Up

An improved chemical conversion coating process for blackening of a specific type of stainless steel has been developed. In this process a new optimized bath compositions and operating procedures were set-up by using different trial & error methods to get the desired coating. The technique is also developed for the simplicity, and economical aspect than other techniques. Characterization of coating is done in terms of morphology, optical, hardness by using SEM, Spectrophotometer, and Indentation Hardness methods. Sea-water and temperature variations effects on the coated surface are also studied.

scholarly journals Characterization of a coated surface by Fourier transform infrared microscopy.

1990 ◽  
Vol 47 (7) ◽  
pp. 553-557 ◽  
Author(s):  
Toshikatsu NISHIOKA ◽  
Tsutomu NISHIKAWA ◽  
Norio TERAMAE ◽  
Tuguo SAWADA
Keyword(s):  
Fourier Transform ◽  
Fourier Transform Infrared ◽  
Infrared Microscopy ◽  
Coated Surface

Physicochemical Characterization of Tetraether Lipids from Thermoplasma acidophilum. II. Film Balance Studies on the Monomolecular Organization of the Main Glycophospholipid in Monofilms

1985 ◽  
Vol 40 (3-4) ◽  
pp. 219-222 ◽  
Author(s):  
Christoph Strobl ◽  
Lambert Six ◽  
Klaus Heckmann ◽  
Birgit Henkel ◽  
Klaus Ring
Keyword(s):  
Surface Pressure ◽  
High Surface ◽  
Physicochemical Characterization ◽  
Thermoplasma Acidophilum ◽  
Alkyl Chains ◽  
Head Groups ◽  
Air Water Interface ◽  
Tetraether Lipids ◽  
High Surface Pressure

The bipolar main tetraether lipid (MPL) of Thermoplasma acidophilum has been shown to form typical liquid expanded films at the air-water interface. The limiting molecular area at the collaps pressure is approximately Ac=73 Å2 per molecule. Monopolar aiphytanyl diether lipids were found to occupy the same area at high surface pressure as MPL. Thus, it was concluded that in the monofilm only one of the two polar headgroups of the MPL molecules is hydrated, i.e. that the single MPL molecules arc oriented upright. The packing properties of MPT. in the monofilm are determined by the properties of the branched alkyl chains only; the polar head groups do not contribute to the space requirement in the film. The collaps pressure of the MPL film is approximately 39 mN m-1 at 8°C. At a surface pressure of π = 30 mN m-1 and 20 °C the film is stable for many hours.

scholarly journals Highly Loaded Cellulose/Poly (butylene succinate) Sustainable Composites for Woody-Like Advanced Materials Application

Molecules ◽  
2019 ◽  
Vol 25 (1) ◽  
pp. 121 ◽  
Author(s):  
Oskars Platnieks ◽  
Sergejs Gaidukovs ◽  
Anda Barkane ◽  
Gerda Gaidukova ◽  
Liga Grase ◽  
...  
Keyword(s):  
Fold Increase ◽  
Advanced Materials ◽  
Butylene Succinate ◽  
Alkyl Chains ◽  
Uniform Dispersion ◽  
Electron Microscopy Analysis ◽  
Microscopy Analysis ◽  
Polymeric Diphenylmethane Diisocyanate ◽  
Polymer Crystallinity

We report the manufacturing and characterization of poly (butylene succinate) (PBS) and micro cellulose (MCC) woody-like composites. These composites can be applied as a sustainable woody-like composite alternative to conventional fossil polymer-based wood-plastic composites (WPC). The PBS/MCC composites were prepared by using a melt blending of 70 wt% of MCC processed from bleached softwood. MCC was modified to enhance dispersion and compatibility by way of carbodiimide (CDI), polyhydroxy amides (PHA), alkyl ester (EST), (3-Aminopropyl) trimethoxysilane (APTMS), maleic acid anhydride (MAH), and polymeric diphenylmethane diisocyanate (PMDI). The addition of filler into PBS led to a 4.5-fold improvement of Young’s modulus E for the MCC composite, in comparison to neat PBS. The 1.6-fold increase of E was obtained for CDI modified composition in comparison to the unmodified MCC composite. At room temperature, the storage modulus E′ was found to improve by almost 4-fold for the APTMS composite. The EST composite showed a pronounced enhancement in viscoelasticity properties due to the introduction of flexible long alkyl chains in comparison to other compositions. The glass transition temperature was directly affected by the composition and its value was −15 °C for PBS, −30 °C for EST, and −10 °C for MAH composites. FTIR indicated the generation of strong bonding between the polymer and cellulose components in the composite. Scanning electron microscopy analysis evidenced the agglomeration of the MCC in the PBS/MCC composites. PMDI, APTMS, and CDI composites were characterized by the uniform dispersion of MCC particles and a decrease of polymer crystallinity. MCC chemical modification induced the enhancement of the thermal stability of MCC composites.

scholarly journals Liquid Crystalline Compounds in the Thiophene Series, Part 6+ Synthesis and Characterization of Azomethines and Vinylenes with Two Mesogenic Groups and Different Alkylene Spacer Lengths

1993 ◽  
Vol 48 (6) ◽  
pp. 826-843 ◽  
Author(s):  
Gerhard Koßmehl ◽  
Frank Dirk Hoppe ◽  
Barbara Hirsch
Keyword(s):  
Aromatic Amines ◽  
Liquid Crystalline ◽  
Synthesis And Characterization ◽  
Scanning Calorimetry ◽  
Polarizing Microscopy ◽  
Alkyl Chains ◽  
Liquid Crystalline Phases ◽  
Smectic Mesophase ◽  
Methylene Groups

Compounds which have two mesogenic groups with and without terminal alkyl chains containing thiophene systems, were prepared from α.ω-bis(5-formyl-2-thienyl)alkanes (3a-3n) and various aromatic amines or 2-fluorenyl-Wittig-salt (10). The liquid crystalline properties of these compounds were characterized by differential scanning calorimetry (DSC) and polarizing microscopy. Only the series of α.ω-bis{5-[N-(4′-butyloxybiphenyl-4-yl)imino]formyl-2-thienyl}alkanes (7a-71) showed enantiotropic smectic and nematic mesophases. The series of E,E-α.ω-bis[5-(2-fluorenylvinyl)-2-thienyl]alkanes (8a-81) showed enantiotropic nematic mesophases for the compounds with 4 and 6 methylene groups, monotropic nematic mesophases for the compounds with 7—12 methylene groups and no liquid crystalline phases for compounds with 3, 5, 16 methylene groups in the connecting alkylene chain. In contrast to the compounds 8a-81, E-l-(5-butyl-2-thienyl)-2-(2-fluorenyl)ethylene has a smectic mesophase.

Fe3O4/MgO Superlattices Grown on MgO(OOl) and Fe/MgO(001) by Molecular Beam Epitaxy

1997 ◽  
Vol 474 ◽  
Author(s):  
G. Chern ◽  
C. L. Chang ◽  
Y. R. Chean
Keyword(s):  
Molecular Beam ◽  
Lattice Mismatch ◽  
High Energy ◽  
High Energy Electron ◽  
X Ray Diffraction ◽  
Oxide Interface ◽  
High Crystalline Quality ◽  
X Ray ◽  
Coated Surface

AbstractThe growth and structural characterization of Fe3O4/MgO superlattices on MgO(001) and Fe-coated MgO(001) are compared. Long modulated coherence and sharp interface are revealed by X-ray diffraction and reflection high energy electron diffraction (RHEED). For the superlattice grown directly on MgO(001), high crystalline quality is comparable to the previous report on the oxide superlattice system. For the superlattice grown on Fe/MgO(001), both chemical and lattice spacing modulations are maintained which is different from the polycrystlline structure of the Fe3O4/NiO grown on Ni-based system. This superiority of the growth on Fe-coated surface results from both the smaller lattice mismatch and the oxidation state of Fe relative to MgO. The changes of the RHEED intensity during the growth of these superlattices are also measured. The evolution of the oxide interface during the growth of Fe3O4/MgO is quantitatively presented.

scholarly journals The Analysis of Periodic Order in Monolayers of Colloidal Superballs

2021 ◽  
Vol 11 (11) ◽  
pp. 5117
Author(s):  
Daniël N. ten Napel ◽  
Janne-Mieke Meijer ◽  
Andrei V. Petukhov
Keyword(s):  
Form Factor ◽  
Colloidal Particles ◽  
Bragg Diffraction ◽  
General Strategy ◽  
X Ray Scattering ◽  
Coated Surface ◽  
Diffraction Peaks ◽  
Diffraction Patterns ◽  
Low Dimensional

The characterization of periodic order in assemblies of colloidal particles can be complicated by the coincidence of Bragg diffraction peaks of the structure and minima in the form factor of the particles. Here, we demonstrate a general strategy to overcome this problem that is applicable to all low-dimensional structures. This approach is demonstrated in the application of small-angle X-ray scattering (SAXS) for the characterization of monolayers of colloidal silica superballs prepared using the unidirectional rubbing method. In this method, the ordering of the colloidal superballs is achieved by mechanically rubbing them onto a polydimethylsiloxane (PDMS)-coated surface. Using three differently shaped superballs, ranging from spherical to almost cubic, we show that certain Bragg peaks may not appear in the diffraction patterns due to the presence of minima in the form factor. We show that these missing Bragg peaks can be visualized by imaging the colloidal monolayers at various orientations. Moreover, we argue that the same strategy can be applied to other techniques, such as neutron scattering.

scholarly journals Alkylated Indolo[3,2,1-Jk]carbazoles as New Building Blocks for Solution Processable Organic Electronics

2020 ◽  
Author(s):  
Thomas Kader ◽  
Guangrong Jin ◽  
Matthias Pletzer ◽  
Dongge Ma ◽  
Johannes Fröhlich ◽  
...  
Keyword(s):  
Organic Electronics ◽  
Photophysical Properties ◽  
Building Blocks ◽  
Electrochemical Stability ◽  
Solution Processed ◽  
Alkyl Chains ◽  
Tert Butyl ◽  
Host Materials ◽  
Blue Solution

<div> <div> <div> <p>A facile strategy for the introduction of tert-butyl and hexyl chains to the indolo[3,2,1-jk]carbazole scaffold is presented. With these building blocks six materials based on three different 4,4ʹ-bis(N- carbazolyl)-1,1ʹ-biphenyl derivatives with varying degree of planarization were prepared. Characterization of the materials showed that the alkyl chains have only minor effects on the photophysical properties of the compounds. In contrast, thermal robustness towards decomposition and electrochemical stability are increased by the introduced alkyl chains. Detailed investigation of the solubility in five different solvents revealed that the incorporation of the alkyl chains increases the solubility significantly. The increased solubility of the materials allowed the application as host materials in red, green and blue solution processed PhOLEDs. Hence, this work presents the first solution processed OLED devices based on the indolo[3,2,1-jk]carbazole scaffold. </p> </div> </div> </div>

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