Preparation, Characterization, and Swelling Behavior of PEGylated Guar Gum @ Ag Nanoparticles

In this study, polyethylene glycol/guar gum @ silver nanoparticles (PEG/GG@AgNPs) were synthesized by using simple sonication method. The nanoparticles were characterized using Fourier-transform infrared spectroscopy (FTIR) and scanning transmission electron microscopy (STEM). The swelling behaviors of nanoparticles were studied in different pHs (5.5 and 7.4). The experimental results were calculated by Fickian diffusion and Schott kinetic models to understand the swelling mechanism and coefficients of the nanoparticles. The results showed that the linear equation of the Fickian diffusion kinetic model was best fit to explain the water diffusion mechanism of the nanoparticle with high correlation coefficient (R2 = 0.982–0.987). The results confirmed that the swelling degree of nanoparticles were 9.71 g/g at pH 5.5. Also, the results confirmed that PEG/GG@AgNPs can be a good candidate for drug delivery systems in pharmaceutical applications

Crystal and Molecular Structure of Bis(2,2-diphenyl-N-(di-n-propylcarbamothioyl) acetamido)copper(II) Complex

Bis(2,2-diphenyl-N-(di-n-propylcarbamothioyl) acetamido)copper(II) complex has been synthesized and characterized by elemental analysis and FT-IR spectroscopy. The crystal and molecular structure of the title compound has been determined from single crystal X-ray diffraction data. It crystallizes in the triclinic space group P-1, with a = 13.046(2) Å, b = 13.135(2) Å, c = 13.179(2) Å, α= 67.083(4)°, β= 67.968(4)°, γ = 84.756(4)° and Dcalc =1.330 g/cm3 for Z = 2. The crystal structure confirms that the complex is a mononuclear copper(II) complex and the 2,2-diphenyl-N-(di-n-propyl-carbamothioyl)acetamide ligand is a bidentate chelating ligand, coordinating to the copper atom through the thiocarbonyl and carbonyl groups. This coordination has a slightly distorted square-planar geometry (O1-Cu1-O2: 86.48(11)°, O1-Cu1-S1: 93.85(9)°, O2-Cu1-S2: 94.20(9)° and S1-Cu1-S2: 91.21(4)°). The title molecule shows a cis-arrangement and C–O, C–S and C–N bond lengths of the complex suggest considerable electronic delocalization in the chelate rings

CCDC 690430: Experimental Crystal Structure Determination

Related Article: H.Arslan, D.S.Mansuroglu, D.VanDerveer, G.Binzet|2009|Spectrochim.Acta,Part A|72|561|doi:10.1016/j.saa.2008.10.049,An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures

The mechanical testing and performance analysis of three-dimensionally produced lingual retainers

Background: Introducing three-dimensional (3D) printing has opened new visions in the orthodontic field. This research evaluates three-dimensionally produced orthodontic retainers and their future possible uses. For this purpose, in vitro tests were performed for these groups, including bond strength, failure analysis, discoloration, and biodegradation. Methods: A total of 30 specimens (n = 30), lower incisor human teeth, were randomly divided into three groups for a bond strength failure analysis (for each group n = 10). In the experimental groups, lingual retainers were fabricated using 3D systems (group 1 with 3D dental pen and group 2 with 3D-printed). In the control group (group 3), the retainer system was a combination of a wire and composite, which is being used worldwide. A total of 30 specimens (n = 30) from the 3D dental pen and 3D-printed for discoloration and biodegradation tests were divided into three groups (water, tea, and coffee). Data were analyzed using the Mann-Whitney U test, ANOVA, and chi-square test. Results: For all parameters tested, significant differences were determined among groups. The 3D pen group had the highest score for bond strength, whereas discoloration differed significantly. Conclusions: According to the limitations of this research, 3D-printed retainers have the potential for clinical use in the near future. © 2023 World Federation of Orthodontist

Electrohydrodynamic Atomization (EHDA) Technique for the Health Sector of Polylactic Acid (PLA) Nanoparticles

Polylactic acid (PLA) is a kind of environmental thermoplastic polymer. Aliphatic polyesters, such as PLA, are a biocompatible polymer with mechanical properties, transparencies and non-toxic properties. These properties are used in consumer products such as packaging, automobile, furniture, food, textile and pharmaceutical industry. In this study, PLA nanoparticle was produced by electrohydrodynamic atomization (EHDA) which is a nanotechnological method. The EHDA system produces micro or nanoparticles by providing an optimization network in the case of high pressure and controllable controllability. Structural properties of the produced nanoparticles (Fourier Transformed Infrared Spectroscopy (FTIR)), thermal (Differential Scanning Calorimeter (DSC)) and morphological (Field Emission Gun Scanning Electron Microscopy (FEGSEM)) characterization studies were made and their properties were determined. PLA nanoparticles with biodegradable properties can be used both as a master and as an additive in clean air filter, tissue engineering and biomedical applications