scholarly journals Characterization of the Casein/Keratin Self-Assembly Nanomicelles

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Su Xiao-Zhou ◽  
Wang Hong-Ru ◽  
Huang Mian
Keyword(s):  
Self Assembly ◽  
Storage Stability ◽  
Mass Ratio ◽  
Scanning Calorimetry ◽  
Uniform Size ◽  
Force Microscopy ◽  
Atomic Force ◽  
Good Potential ◽  
And Storage

Complex nanomicelles were made from casein and keratin through electrostatic self-assembly and transglutaminase fixation that was proved to be harmless and green. The complex nanomicelles were characterized by dynamic light scattering, scanning electron microscopy, atomic force microscopy, Fourier transform infrared spectroscopy, differential scanning calorimetry, and steady-state florescence. The results show that the complex nanomcelles acquired at the neutral pH in the mass ratio of casein to keratin 4 : 1 exhibit an anomalous sphere shape with uniform size which the diameter is about 40–70 nm. The complex nanomicelles in solution possess excellent dilution and storage stability due to the fixation and their highζ-potential (22.8 mV). The complex nanomicelles are relatively hydrophilic and have a good potential for industrial application.

scholarly journals Characterization of the Spindle Morphology Nanomicelles Assembled from Sericin and Gelatin

2017 ◽  
Vol 2017 ◽  
pp. 1-9
Author(s):  
Xiaozhou Su ◽  
Lei Li ◽  
Weihan Huang
Keyword(s):  
Electron Microscopy ◽  
Protein Concentration ◽  
Scanning Calorimetry ◽  
Force Microscopy ◽  
Atomic Force ◽  
Transmission Electron ◽  
Ft Ir ◽  
And Storage ◽  
Ft Ir Spectroscopy

Complex nanomicelles were prepared by sericin and type A gelatin with molecular weight of 5789 Da and 128664 Da separately. The assembling conditions were as follows: mass ratio (sericin/gelatin) was 1 : 1, protein concentration was 0.5%, temperature was 35°C, and assembling time was 18 hours. Scanning electron microscopy (SEM), atomic force microscopy (AFM), transmission electron microscopy (TEM), Fourier transform infrared (FT-IR) spectroscopy, differential scanning calorimetry (DSC), and dynamic light scattering (DLS) were conducted to observe and characterize the complex nanomicelles. Results showed that the complex sericin/gelatin micelles was a kind of nanospindle micelles. The micelles had high electrochemical stability, thermal stability, antidilution stability, and storage stability.

scholarly journals Morphometric characterization of fibrinogen's αC regions and their role in fibrin self-assembly and molecular organization

Nanoscale ◽  
2017 ◽  
Vol 9 (36) ◽  
pp. 13707-13716 ◽  
Author(s):  
Anna D. Protopopova ◽  
Rustem I. Litvinov ◽  
Dennis K. Galanakis ◽  
Chandrasekaran Nagaswami ◽  
Nikolay A. Barinov ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Self Assembly ◽  
Molecular Organization ◽  
Microscopy Imaging ◽  
Force Microscopy ◽  
Atomic Force ◽  
Atomic Force Microscopy Imaging ◽  
Morphometric Characterization

High-resolution atomic force microscopy imaging reveals the role of fibrinogen αC regions in the early stages of fibrin self-assembly.

scholarly journals Identification and nanomechanical characterization of the fundamental single-strand protofilaments of amyloid α-synuclein fibrils

2018 ◽  
Vol 115 (28) ◽  
pp. 7230-7235 ◽  
Author(s):  
Francesco Simone Ruggeri ◽  
Fabrizio Benedetti ◽  
Tuomas P. J. Knowles ◽  
Hilal A. Lashuel ◽  
Sergey Sekatskii ◽  
...  
Keyword(s):  
Single Molecule ◽  
Self Assembly ◽  
Amyloid Fibrils ◽  
Molecular Assembly ◽  
Single Strand ◽  
Force Microscopy ◽  
Atomic Force ◽  
Presynaptic Protein ◽  
Polypeptide Chains

The formation and spreading of amyloid aggregates from the presynaptic protein α-synuclein in the brain play central roles in the pathogenesis of Parkinson’s disease. Here, we use high-resolution atomic force microscopy to investigate the early oligomerization events of α-synuclein with single monomer angstrom resolution. We identify, visualize, and characterize directly the smallest elementary unit in the hierarchical assembly of amyloid fibrils, termed here single-strand protofilaments. We show that protofilaments form from the direct molecular assembly of unfolded monomeric α-synuclein polypeptide chains. To unravel protofilaments’ internal structure and elastic properties, we manipulated nanomechanically these species by atomic force spectroscopy. The single-molecule scale identification and characterization of the fundamental unit of amyloid assemblies provide insights into early events underlying their formation and shed light on opportunities for therapeutic intervention at the early stages of aberrant protein self-assembly.

Nanoindentation Assisted Self-Assembly of Quantum Dots

2006 ◽  
Author(s):  
Curtis Taylor ◽  
Eric Stach ◽  
Gregory Salamo ◽  
Ajay Malshe
Keyword(s):  
Quantum Dots ◽  
Self Assembly ◽  
Surface Strain ◽  
Ex Situ ◽  
Atomic Step ◽  
Uniform Size ◽  
Force Microscopy ◽  
Atomic Force ◽  
And Performance ◽  
Spatial Positioning

The ability to pattern quantum dots with high spatial positioning and uniform size is critical for the realization of future electronic devices with novel properties and performance that surpass present technology. This work discusses the exploration of an innovative nanopatterning technique to direct the self-assembly of nanostructures. The technique focuses on perturbing surface strain energy by nanoindentation in order to mechanically bias quantum dot nucleation. Growth of InAs quantum dots on nanoindent templates is performed using molecular beam epitaxy (MBE). The effect of indent spacing and size on the patterned growth is investigated. The structural analysis of the quantum dots including spatial ordering, size, and shape are characterized by ex-situ atomic force microscopy (AFM). Results reveal that the indent patterns clearly bias nucleation with dot structures selectively growing on top of each indent. It is speculated that the biased nucleation is due to a combination of favorable surface strain attributed to subsurface dislocation strain fields and/or multi-atomic step formation at the indent sites, which leads to increased adatom diffusion on the patterned area.

scholarly journals Influence of hematite nanorods on the mechanical properties of epoxy resin

2017 ◽  
Vol 82 (4) ◽  
pp. 437-447 ◽  
Author(s):  
Gordana Bogdanovic ◽  
Tijana Kovac ◽  
Enis Dzunuzovic ◽  
Milena Spírková ◽  
Phillip Ahrenkiel ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Epoxy Resin ◽  
Microstructural Characterization ◽  
Uniform Size ◽  
Force Microscopy ◽  
Atomic Force ◽  
Transmission Electron ◽  
Uniform Size Distribution ◽  
Tensile Toughness

The mechanical properties of nanocomposites obtained by incorporation of fairly uniform hematite nanorods (?-Fe2O3 NRs) into epoxy resin were studied as a function of the content of the inorganic phase. A thorough microstructural characterization of the ?-Fe2O3 NRs and the nanocomposites was performed using transmission electron microscopy (TEM) and atomic force microscopy (AFM). The TEM measurements revealed rod-like morphology of the nanofiller with a uniform size distribution (8.5 nm?170 nm, diameter?length). High-magnification TEM and AFM measurements indicated agglomeration of ?-Fe2O3 NRs embedded in the epoxy resin. Stress at break, strain at break, elastic modulus and tensile toughness of the nanocomposites were compared with the data obtained for pure epoxy resin. Significant influence of nanofiller on the mechanical properties of epoxy resin, as well as on the glass transition temperature, could be noticed for samples with low contents of the inorganic phase (up to 1 wt. %).

scholarly journals Synthesis and Characterization of Syndiotactic Polystyrene-Polyethylene Block Copolymer

Polymers ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 698 ◽  
Author(s):  
Lamparelli ◽  
Speranza ◽  
Camurati ◽  
Buonerba ◽  
Oliva
Keyword(s):  
Direct Synthesis ◽  
Gel Permeation Chromatography ◽  
Syndiotactic Polystyrene ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Reaction Conditions ◽  
Force Microscopy ◽  
Synthetic Strategy ◽  
Atomic Force

The direct synthesis of syndiotactic polystyrene-block-polyethylene copolymer (sPS-b-PE) with a diblock structure has been achieved. The synthetic strategy consists of the sequential stereocontrolled polymerization of styrene and ethylene in the presence of a single catalytic system: cyclopentadienyltitanium(IV) trichloride activated by modified methylaluminoxane (CpTiCl3/MMAO). The reaction conditions suitable for affording the partially living polymerization of these monomers were identified, and the resulting copolymer, purified from contaminant homopolymers, was fully characterized. Gel permeation chromatography coupled with two-dimensional NMR spectroscopy COSY, HSQC, and DOSY confirmed the block nature of the obtained polymer, whose thermal behaviour and thin film morphology were also investigated by differential scanning calorimetry, powder wide angle x-ray diffraction, and atomic force microscopy.

scholarly journals Multicomponent Network Formation in Selective Layer of Composite Membrane for CO2 Separation

Membranes ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 174
Author(s):  
Jelena Lillepärg ◽  
Evgeni Sperling ◽  
Marit Blanke ◽  
Martin Held ◽  
Sergey Shishatskiy
Keyword(s):  
Network Formation ◽  
Composite Membranes ◽  
Low Molecular Weight ◽  
Scanning Calorimetry ◽  
Selective Layer ◽  
Characterization Methods ◽  
Force Microscopy ◽  
Thin Film Composite ◽  
Atomic Force

As a promising material for CO2/N2 separation, PolyActiveTM can be used as a separation layer in thin-film composite membranes (TFCM). Prior studies focused on the modification of PolyActiveTM using low-molecular-weight additives. In this study, the effect of chemical crosslinking of reactive end-groups containing additives, forming networks within selective layers of the TFCM, has been studied. In order to understand the influence of a network embedded into a polymer matrix on the properties of the resulting materials, various characterization methods, including Fourier transform infrared spectroscopy (FTIR), gas transport measurements, differential scanning calorimetry (DSC) and atomic force microscopy (AFM), were used. The characterization of the resulting membrane regarding individual gas permeances by an in-house built “pressure increase” facility revealed a twofold increase in CO2 permeance, with insignificant losses in CO2/N2 selectivity.

scholarly journals Characterization and Evaluation of Controlled Antimicrobial Release from Petrochemical (PU) and Biodegradable (PHB) Packaging

Polymers ◽  
2018 ◽  
Vol 10 (8) ◽  
pp. 817 ◽  
Author(s):  
Alexey Iordanskii ◽  
Anna Zhulkina ◽  
Anatoliy Olkhov ◽  
Sergey Fomin ◽  
Andrey Burkov ◽  
...  
Keyword(s):  
Polymer Surface ◽  
Active Agent ◽  
Diffusion Test ◽  
Scanning Calorimetry ◽  
Disk Diffusion Test ◽  
Force Microscopy ◽  
Barrier Materials ◽  
Atomic Force ◽  
Kinetic Release

The academic exploration and technology design of active packaging are coherently supplying innovative approaches for enhancing the quality and safety of food, as well as prolonging their shelf-life. With the object of comparison between two barrier materials, such as stable petrochemical polyurethane (PU), (BASF), and biodegradable natural poly(3-hydroxybutyrate) (PHB), (Biomer Co., Krailling, Germany), the study of antibacterial agent release has been performed. For the characterization of polymer surface morphology and crystallinity, the scanning electron microscopy (SEM), atomic force microscopy (AFM) and differential scanning calorimetry (DSC) were used respectively. The antimicrobial activity of chlorhexidine digluconate (CHD) has been estimated by the Bauer–Kirby Disk Diffusion Test. It was shown that the kinetic release profiles of CHD, as the active agent, in both polymers, significantly differed due to the superposition of diffusion and surface degradation in poly(3-hydroxybutyrate) (PHB). To emphasize the special transport phenomena in polymer packaging, the diffusivity modeling was performed and the CHD diffusion coefficients for the plane films of PU and PHB were further compared. The benefit of active biodegradable packaging on the base of PHB is discussed.

Fabrication and Characterization of LuminescentMultilayer Films Based on Polyoxometalates and Fuchsin Basic

2011 ◽  
Vol 66 (1) ◽  
pp. 43-48
Author(s):  
Changyun Chen ◽  
Jun Peng ◽  
Yan Shen ◽  
Dan Chen ◽  
Huanqiu Zhang ◽  
...  
Keyword(s):  
Self Assembly ◽  
Multilayer Film ◽  
Photoelectron Spectra ◽  
Layer By Layer ◽  
X Ray ◽  
Force Microscopy ◽  
Assembly Method ◽  
Atomic Force ◽  
Fabrication And Characterization

A luminescent multilayer film has been fabricated from the polyoxometalate anion α- [PMo12O40]3− (α-PMo12) and the cation Fuchsin Basic (FB) through an electrostatic layer-by-layer (LbL) self-assembly method and characterized by UV/Vis spectra, atomic force microscopy and X-ray photoelectron spectra. The fluorescence properties of the LbL film have also been investigated. Cyclic voltammetry measurements have demonstrated that the electrochemical properties of the polyoxometalate and FB are maintained in the multilayer film, which exhibits electrocatalytic activity for the reduction of bromate

scholarly journals Polyaniline–nanodiamond fibers resulting from the self-assembly of nano-fibrils: a nanomechanical study

Nanoscale ◽  
2015 ◽  
Vol 7 (34) ◽  
pp. 14358-14367 ◽  
Author(s):  
Daniele Passeri ◽  
Emanuela Tamburri ◽  
Maria Letizia Terranova ◽  
Marco Rossi
Keyword(s):  
Atomic Force Microscopy ◽  
Self Assembly ◽  
The Self ◽  
Force Microscopy ◽  
Self Assembling ◽  
Atomic Force

Nanomechanical characterization of micrometric fibers of polyaniline (PANI) doped with nanodiamond (ND) particles resulting from the self-assembling of PANI/ND nano-fibrils has been performed using torsional harmonics atomic force microscopy.

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