An Invitation to El Naschie’s Theory of Cantorian Space-Time and Dark Energy

The paper is a condensed but accurate account of El Naschie’s theory of Cantorian space-time which was used by him to clarify some major problems in theoretical physics and cosmology. In particular El Naschie’s revision and completion of relativity theory and demystification of dark energy are destined to be two milestones in the history of theoretical physics.

Needleless Electrospinning:Reciprocation vs.Rotation

Needleless electrospinning is a versatile method to produce nanofibers.In particular,the rotary version of this technique has enjoyed widespread use because there is no need to clean the spinneret.The rotation speed is limited by the potential deviation of the jet due to the centrifugal force.Other limitations are due to the fast volatilization of the solvent from the opened spinning system.In order to overcome these drawbacks,here a novel reciprocating system based on a moving spinning-plate is proposed.The spinning process is implemented in a half-closed system with the spinning-plate immersed in the solution tank.When the immersed spinning-plate moves up from the solution tank,multiple jets are ejected from the droplets on the tips of the spinning-plate under the effect of an electric field force.The morphology of the obtained nanofibers has been analyzed by scanning electron microscopy.The results indicated that the obtained fibers are uniform in structures and small in diameters.Both issues of needle clogging and intense solvent evaporation can be mitigated using this alternate approach.

Multifunctional Fibroblasts Enhanced via Thermal and Freeze-Drying Post-treatments of Aligned Electrospun Nanofiber Membranes

Parallel fibrous scaffolds play a critical role in controlling the morphology of cells to be more natural and biologically inspired.Among popular tissue engineering materials,poly(2-hydroxyethyl methacrylate)(pHEMA)has been widely investigated in conventional forms due to its biocompatibility,low toxicity,and hydrophilicity.However,the swelling of pHEMA in water remains a major concern.To address this issue,randomly oriented and aligned as-spun pHEMA nanofibrous scaffolds were first fabricated at speeds of 300 and 2000 rpm in this study,which were then post-treated using either a thermal or a freeze-drying method.In cell assays,human dermal fibroblasts(HDFs)adhered to the freeze-drying treated substrates at a significantly faster rate,whereas they had a higher cell growth rate on thermally-treated substrates.Results indicated that the structural properties of pHEMA nanofibrous scaffolds and subsequent cellular behaviors were largely dependent on post-treatment methods.Moreover,this study suggests that aligned pHEMA nanofibrous substrates tended to induce regular fibroblast orientation and unidirectionally oriented actin cytoskeletons over random pHEMA nanofibrous substrates.Such information has predictive power and provides insights into promising post-treatment methods for improving the properties of aligned pHEMA scaffolds for numerous tissue engineering applications.

TiO2 nanotube arrays decorated with Au and Bi2S3 nanoparticles for efficient Fe3+ ions detection and dye photocatalytic degradation

Due to increasingly serious environmental problems,many researchers are investigating green cleanenergy to solve the world’s energy supply issues.So the strategy that Au nanoparticles(Au NPs)and bismuth sulfide(Bi2S3)NPs are used to evenly decorate TiO2 nanotube arrays(TiO2 NTAs)was carried out.Composite materials demonstrated enhanced solar light absorption ability and excellent photoelectrochemical performance.This was attributed to the presence of Bi2S3 NPs with a narrow band gap and the decoration with noble metallic Au NPs which resulted in local surface plasmon resonance(LSPR)effects.The Au/Bi2S3@TiO2 NTAs composites exhibit improved photocatalytic activity for the degradation of methylene blue(MB)under irradiation of UV and visible light.Moreover,the Au/Bi2S3@TiO2 NTAs exhibits high fluorescence emission at 822 nm.Due to the better binding affinity between Bi2S3,TiO2 and Fe3+ions,the synthesized nanocomposites exhibit high selectivity to Fe3+ions.The number of binding sites for Au/Bi2S3@TiO2 NTAs was estimated to be 1.41 according to the double logarithmic regression method.The calculated value of"K"was 1862 M-1.Fluorescence emission intensity decreases with increasing concentration(30μM–5000μM).The detection limit of the synthesized sensor is 0.221μM.