Effect of Gelatin Content on Degradation Behavior of PLLA/Gelatin Hybrid Membranes.

Background: Poly(L-lactic acid) (PLLA) is a biodegradable polymer (BP) that replaces conventional petroleum-based polymers.  The hydrophobicity of biodegradable PLLA periodontal barrier membrane in wet state can be solved by alloying it with natural polymers. Alloying PLLA with gelatin imparts wet mechanical properties, hydrophilicity, shrinkage, degradability and biocompatibility to the polymeric matrix.

Electrospun Poly(L-Lactic Acid)/Gelatin Hybrid Polymer as a Barrier to Periodontal Tissue Regeneration.

Poly(L-lactic acid) (PLLA) and PLLA/gelatin polymers were prepared via electrospinning to evaluate the effect of PLLA and gelatin content on the mechanical properties, water uptake capacity (WUC), water contact angle (WCA), degradation rate, cytotoxicity and cell proliferation of membranes. As the PLLA concentration increased from 1 wt% to 3 wt%, the tensile strength increased from 5.8 MPa to 9.

Preparation and Drug Release Behavior of Nifedipine-Loaded Poly(lactic acid)/Polyethylene Glycol Microcapsules.

Nifedipine (NF)-loaded poly(lactic acid) (PLA) and PLA/polyethylene glycol (PLA/PEG) microcapsules are synthesized using a high-speed agitator and a syringe pump with an oil-in-water emulsion-solvent evaporation technique to evaluate the effect of PLA/PEG ratio on morphology and drug release behavior of the capsules. Fourier transform infrared spectroscopy (FT-IR), differential scanning calorimeter (DSC), and X-ray diffraction (XRD) results indicate that PEG reacts successfully with PLA due to the ether bond between PEG and PLA. The drug release rate of PLA and PLA/PEG capsules increases dramatically from 0 to 5 min and then reaches a plateau within 15 to 20 min.

Photocatalytic Activity of W-Doped TiO2 Nanofibers for Methylene Blue Dye Degradation.

Photocatalytic degradation of methylene blue (MB) in water was examined using W-doped TiO2 nanofibers prepared by a sol-gel derived electrospinning and subsequent calcination for 4 h at 550 degrees C. Different concentrations of W dopant in the range of 0 to 8 mol% were synthesized to evaluate the effect of W concentration on the photocatalytic activity of TiO2. XRD results indicated that the undoped TiO2 is composed of anatase and rutile phases.

Effect of Al Doping on Optical Band Gap Energy of Al-TiO2 Thin Films.

Al-TiO2 thin films were prepared using a sol-gel derived spin coating by varying the Al/Ti molar ratio from 0 to 0.73 to investigate the effect of Al doping on the optical band gap energy (Eg) of the films. GAXRD results indicated that Al-TiO2 is composed of anatase and FTO phases when the Al/Ti molar ratio was less than 0.

Influence of Calcination Temperature on Crystal Structure of Pt-TiO2 Nanofibers.

Platinum (Pt) doped TiO2 nanofibers were prepared by a sol-gel derived electrospinning and subsequent calcination for 3 h at temperatures from 500 degrees C to 700 degrees C in air. The influence of calcination temperature on crystal structure of the Pt-TiO2 nanofibers was investigated by using an X-ray diffractometer (XRD) and a transmission electron microscope (TEM). The fibers possessed both anatase and rutile phases of TiO2 as a function of the calcination temperature.

Influence of sintering temperature on photoluminescence of Gd2O3:Eu3+ phosphors prepared by liquid phase reaction method.

Nanostructured materials with diameters less than 100 nm have been studied vigorously in recent years. Many studies have been devoted on exceptional optical properties induced by quantum confinement for fundamental research and applications. For excellent luminescence characteristics, phosphor particles have to acquire fine size, narrow size distribution, non-aggregation, good crystalline, and spherical morphology.

Microstructure and hardness of nano-sized Fe-based self-fluxing alloy powder with SiC particles.

The Fe-based self-fluxing alloy powders and SiC particles were mixed and milled by high energy ball-milling, and their microstructure and micro-hardness were investigated after subsequent compaction and sintering. The initial alloy powders with a mean size of approximately 80 microm were fined to 2.1 microm after milling at 800 rpm for 5 h.

Effect of spark plasma sintering on plasma electrolytic oxidation coatings on gas-atomized Mg-Zn-Y alloy containing nano-sized powders.

Mg-1.0wt%Zn-2.0wt%Y alloy powders were produced by gas atomization, and subsequently sintered by spark plasma sintering (SPS).