Multifunctional hyperbranched polyester grafted β-cyclodextrin metal complexes for textile coating

This study approached the developing of grafted beta cyclodextrins (β-CD) for achievement multifunctional properties. Hyperbranched bis-MPA-polyester-16-hydroxyl, generation 2, (HBPE-2) was used as crosslinker in the presence of cobalt (Co) or nickel (Ni) acetate using emulsion technique. The resulting materials were applied in the printing paste for in situ printing of cellulosic fabrics using phthalocyanine organic pigment (C.I: pigment blue 15:3). Fourier transform infrared spectroscopy (FTIR), transmission electron microscope (TEM) and particle size distribution analysis using dynamic light scattering (DLS) technique were examined to illustrate the structure and morphologies of the prepared materials. Moreover, the antimicrobial activity against gram-positive (Staphylococcus aureus) and gram-negative (Escherichia coli) bacteria using the agar diffusion method was also carried out. The FTIR results demonstrated that HBPE-2 can serve as a good crosslinker to obtain the grafted β-CD with high thermal stability and physical attachment relative to the uncrosslinked one. Also, TEM and particle size analysis indicated that successful metal binding to the grafted β-CD was obtained with different morphologies and low particle size relative the uncrosslinked one. All the grafted β-CD samples exhibited good antimicrobial activity up to 20 mg concentration. Besides, the prepared materials accelerated the colour fixation on the surface of the cellulosic fabric prints relative to the used conventional pigment printing under the unfavorable conditions.

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Novelty of Bioengineered Iron Nanoparticles in Nanocoated Surgical Cotton: A Green Chemistry

Advances in Pharmacological Sciences ◽

10.1155/2019/9825969 ◽

2019 ◽

Vol 2019 ◽

pp. 1-10 ◽

Cited By ~ 6

Author(s):

Bhavika Turakhia ◽

Saujanya Chikkala ◽

Sejal Shah

Keyword(s):

Antimicrobial Activity ◽

Particle Size ◽

Green Chemistry ◽

Iron Nanoparticles ◽

Synthesis Method ◽

Cost Effective ◽

Zingiber Officinale ◽

Particle Size Analysis ◽

Size Analysis ◽

Ginger Extract

The current focus of nanotechnology is to develop environmentally safe methodologies for the formulation of nanoparticles. The phytochemistry of Zingiber officinale inspired us to utilize it for the synthesis of iron nanoparticles. GC-MS analysis revealed the phytochemical profile of ginger. Out of 20 different chemicals, gingerol was found to be the most potent phytochemical with a retention time of 40.48 min. The present study reports a rapid synthesis method for the formation of iron nanoparticles and its potential efficacy as an antibacterial agent and an antioxidant. Because of its antibacterial property, ginger extract was used to coat surgical cotton. Synthesized ginger root iron nanoparticles (GR-FeNPs) were characterized by UV-visible spectroscopy, Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction analysis, and particle size analysis. XRD confirmed the crystalline structure of iron oxide nanoparticles as it showed the crystal plane (2 2 0), (3 1 1), (2 2 2), and (4 0 0). The particle size analyzer (PSA) showed the average size of the particles, 56.2 nm. The antimicrobial activity of the FeNPs was tested against different Gram-positive and Gram-negative bacteria. E. coli showed maximum inhibition as compared with the other organisms. Antioxidant activity proved the maximum rate of free radicals at 160 µg/mL produced by nanoparticles. In addition, the antimicrobial activity of nanocoated surgical cotton was evaluated on the first day and 30th day after coating, which clearly showed excellent growth inhibition of organisms, setting a new path in the field of medical microbiology. Hence, iron-nanocoated surgical cotton synthesized using green chemistry, which is antimicrobial and cost effective, might be economically helpful and provide insights to the medical field, replacing conventional wound healing treatments, for better prognosis.

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Size distribution analysis of microstickies treated by enzyme mixtures in papermaking whitewater

TAPPI Journal ◽

10.32964/tj18.3.183 ◽

2019 ◽

Vol 18 (3) ◽

pp. 183-192

Author(s):

YANAN TANG ◽

SHENGFANG GENG ◽

CARL HOUTMAN ◽

SHUBIN WU

Keyword(s):

Particle Size ◽

Capillary Flow ◽

New Technology ◽

Physicochemical Characteristics ◽

Particle Size Analysis ◽

Enzyme Treatment ◽

Size Analysis ◽

Distribution Analysis ◽

Dye Tracing ◽

Formidable Challenge

Microstickies present a formidable challenge for papermakers. Many strategies have been explored to control them. Enzyme treatment is a promising technology, but the mechanism of its action has not been determined, thus inhibiting further application of this new technology. This study investigated characteristics and size distributions of microstickies treated by esterase-cellulase mixtures. Determination of particle size and number was accomplished using a modified flow cytometer, which combined streaming capillary flow, laser-based particle size analysis and fluorescent dye tracing. The results showed that treatment of samples with enzyme mixtures induced size reduction of the larger microstickies. This effect was most dramatic for 1:1 ratios of esterase to cellulase. The treated particles were more stable than untreated ones. The smaller microstickies treated with some ratios of esterase and cellulase tended to aggregate over time. The behaviors of microstickies treated by enzyme mixtures were only slightly affected by temperature and shearing action. The surface physicochemical characteristics of these particles indicated that changes of these basic properties affected the whole whitewater system and resulted in a new equilibrium among all the particles.

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Particle Size Distribution Analysis of an Alumina Powder: Influence of Some Dispersants, pH and Supersonic Vibration

Materials Science Forum ◽

10.4028/www.scientific.net/msf.498-499.73 ◽

2005 ◽

Vol 498-499 ◽

pp. 73-78 ◽

Cited By ~ 3

Author(s):

C.J. Papini ◽

Walter Kenji Yoshito ◽

Douglas Gouvêa ◽

Ricardo Mendes Leal Neto

Keyword(s):

Particle Size ◽

Particle Size Distribution ◽

Size Distribution ◽

Electrostatic Force ◽

Particle Size Analysis ◽

Size Analysis ◽

Alumina Powder ◽

Distribution Analysis ◽

Laser Scattering ◽

Dispersion Condition

It is well known that colloidal powder particles (between 1 mm and 0.001 mm) tend to agglomerate due to electrostatic forces. Then assuring an optimal dispersion condition is essential for good particle-size analysis results, since aggregates or weak agglomerates can be measured as single particles. In this paper the particle size distribution of an alumina powder A1000SG (ALCOA) was measured using distinct dispersion procedures. Distilled water was used as dispersant liquid in the pure state and with additives (citric acid and Duramax D-3005). Dispersion by supersonic vibration was also investigated, but only the application time was varied. Particle size analysis was accomplished by laser scattering technique and the dispersion condition was evaluated through zeta potential. The results showed that the Duramax’s electrosteric impediment is more efficient than citric acid’s electrostatic force, thereby providing better dispersion. Although useful, the supersonic vibration was not good enough to assure an optimal dispersion, at least for the material tested here.

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