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Stiffness-tunable biomaterials provide a good extracellular matrix environment for axon growth and regeneration

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Neural Regeneration Research 2025年第5期20卷 1364-1376页

作者： Ronglin Han Lanxin Luo Caiyan Wei Yaru Qiao Jiming Xie Xianchao Pan Juan Xing department of Pathophysiology School of Basic Medical SciencesSouthwest Medical UniversityLuzhouSichuan ProvinceChina department of Medicinal chemistry School of PharmacySouthwest Medical UniversityLuzhouSichuan ProvinceChina

Neuronal growth, extension, branching, and formation of neural networks are markedly influenced by the extracellular matrix—a complex network composed of proteins and carbohydrates secreted by cells. In addition to providing physical support for cells, the extracellular matrix also conveys critical mechanical stiffness cues. During the development of the nervous system, extracellular matrix stiffness plays a central role in guiding neuronal growth, particularly in the context of axonal extension, which is crucial for the formation of neural networks. In neural tissue engineering, manipulation of biomaterial stiffness is a promising strategy to provide a permissive environment for the repair and regeneration of injured nervous tissue. Recent research has fine-tuned synthetic biomaterials to fabricate scaffolds that closely replicate the stiffness profiles observed in the nervous system. In this review, we highlight the molecular mechanisms by which extracellular matrix stiffness regulates axonal growth and regeneration. We highlight the progress made in the development of stiffness-tunable biomaterials to emulate in vivo extracellular matrix environments, with an emphasis on their application in neural repair and regeneration, along with a discussion of the current limitations and future prospects. The exploration and optimization of the stiffness-tunable biomaterials has the potential to markedly advance the development of neural tissue engineering.

关键词： alginate axon growth biomaterials extracellular matrix neural repair neurons neuroregeneration polyacrylamide polydimethylsiloxane stiffness

Effect of Graphene Oxide as a Dopant on the Electrochemical Performance of Graphene Oxide/Polyaniline Composite

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Journal of Materials Science & Technology 2014年第4期30卷 321-327页

作者： Fang Hu Wenhai Li Ji Zhang Wei Meng department of physical chemistry China Pharmaceutical University

A method for preparing a graphene oxide/polyaniline （GO/PANI） composite electrode was developed to investigate the effect of GO doped in PANI. PANI was first prepared by the polymerisation of aniline and then dedoped by NH4OH to form emeraldine base （EB）. The dedoped PANI and as-prepared GO were dissolved in N-methyl-2-pyrrolidone （NMP） to generate a homogeneous dispersion. The GO/PANI composites were redoped in HCI before use as electrode materials. These composites were characterised by Raman spectroscopy, X-ray diffraction, UV-vis adsorption spectroscopy, scanning electron microscopy, atomic force microscopy and electrochemical measurements. The GO/PANI composite electrode （containing 2.5% GO） has an initial gravimetric capacitance of 896 F g-1 at a scan rate of 5 mV s-1 and a retention life of 51% after 500 cycles, which is an improvement over that of pure PANI （23%）. The results show that the synergy of GO and PANI attributes to the good electrochemical performance of the GO/PANI composite electrode.

关键词： Electrical properties Carbon film Capacitance Materials synthesis

Bond Valence Sum Analysis of Tl(Ⅰ) and Tl(Ⅲ) Complexes with O and N Donors

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Chinese Journal of Structural chemistry 2011年第12期30卷 1820-1826页

作者： Gus J.Palenika 胡盛志 chemistry department The University of Florida department of chemistry Institute of Physical ChemistryXiamen University

The influence of the lone pair of electrons in thallium complexes is analyzed using the bond valence sum *** length data for metal-organic Tl complexes were obtained from the Cambridge Structural Database（CSD）,and problems with searching the CSD file for Tl complexes are *** recommended R0 values for Tl（Ⅰ）-O of 2.162 ,Tl（Ⅲ）-O of 2.016 ,Tl（Ⅰ）-N of 2.286 ？,and for Tl（Ⅲ）-N of 2.014  used with b = 0.37 were derived from analyses of homoleptic Tl-O,Tl-N,and heteroleptic Tl-O and-N metal organic *** R0 values can be used to assign correctly the oxidation state of Tl in complexes containing any combination of Tl-O or Tl-N *** of questionable oxidation states for Tl complexes are *** R0 value for Tl（Ⅲ）-Cl of 2.300  was also determined.

关键词： thallium complex oxidation state bond valence parameter crystal structure

Photocatalytic reduction of CO2 with H2O over modified TiO2 nanofibers： Understanding the reduction pathway

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Nano Research 2016年第7期9卷 1956-1968页

作者： Anjana Sarkar Eduardo Gracia-Espino Thomas Wagberg Andrey Shchukarev Melinda Mohl Anne-Riikka Rautio Olli Pitkanen Tiva Sharifi Krisztian Kordas Jyri-Pekka Mikkola Technical chemistry Department of Chemistry Chemical-Biological Centre Umea University SE-901 87 Umea Sweden department of Physics Umea University SE-901 87 Umea Sweden Microelectronics and Materials Physics Laboratories Department of Electrical Engineering University of Oulu P.O. Box 4500 Oulu FI-90014 Finland Laboratory of Industrial chemistry and Reaction Engineering Johan Gadofin Process Chemistry Centre Abo Akademi University Biskopsgatan 8 Abo-Turku FI-20500 Finland

Nanosized metal （Pt or Pd）-decorated TiO2 nanofibers （NFs） were synthesized by a wet impregnation method. CdSe quantum dots （QDs） were then anchored onto the metal-decorated TiO2 NFs. The photocatalytic performance of these catalysts was tested for activation and reduction of CO2 under UV-B light. Gas chromatographic analysis indicated the formation of methanol, formic acid, and methyl formate as the primary products. In the absence of CdSe QDs, Pd-decorated TiO2 NFs were found to exhibit enhanced performance compared to Pt-decorated TiO2 NFs for methanol production. However, in the presence of CdSe, Pt-decorated TiO2 NFs exhibited higher selectivity for methanol, typically producing -90 ppmg^-1.h^-1 methanol. The CO2 photoreduction mechanism is proposed to take place via a hydrogenation pathway from first principles calculations, which complement the experimental observations.

关键词： TiO2 photocatalysis CdSe quantum dots CO2 photoreduction

PREPARATION, CHARACTERIZATION AND ADHESIVE PROPERTIES OF DI-AND TRI-HYDROXY BENZOYL CHITOSAN NANOPARTICLES

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Chinese Journal of Polymer Science 2013年第4期31卷 649-659页

作者： Mohamad Taghi Taghizadeh Ali Bahadori department of physical chemistry Faculty of ChemistryUniversity of TabrizTabrizIran

Modified chitosans with 3,4-di-hydroxy benzoyl groups （CS-DHBA） and 3,4,5-tri-hydroxy benzoyl groups （CS- THBA） were synthesized and their nanoparticles were prepared via ionic crosslinking by tripolyphosphate （TPP）. The chemical structure and degree of substitution （DS） of di- and tri-hydroxy benzoyl chitosans are determined by FTIR and IH- NMR spectroscopy. The morphology of particles, size distribution and zeta potential of nanoparticles were studied using transmission electron microscopy （TEM） and dynamic light scattering （DLS）, respectively. The mean diameters of particles of CS-DHBA and CS-THBA nanoparticles were 144 nm and 112 nm, respectively. It was found that the particles size decreased slightly with decreasing the degree of substitution and increasing degree of deacetylation （DD）, due to increasing of ionic crosslinking of ammonium ions and polyanions of tripolyphosphate. The TEM photographs of CS-DHBA show that these particles are spherical in shape, but the particles of CS-THBA show some aggregation. In addition, the solubility and the mechanical properties of the prepared modified chitosans and their nanoparticles were evaluated for bio-adhesive and biomedical application. The results of solubility tests indicated that, the CS-DHBA and CS-THBA have higher solubility at pH 〉 7 comparing to CS. Also the CS-DHBA, CS-THBA and their nanoparticles showed a significant adhesive capacity and enhanced tensile strength and tensile modulus.

关键词： Nanoparticles Di- and tri-hydroxy benzoyl chitosans Ionic cross linking Solubility Adhesive properties.

Volumetric and ultrasonic properties of thiamine hydrochloride drug in aqueous solutions of choline-based deep eutectic solvents at different temperatures

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Chinese Journal of Chemical Engineering 2023年第10期62卷 21-30页

作者： Hemayat Shekaari Fariba Ghaffari Masumeh Mokhtarpour department of physical chemistry University of TabrizTabrizIran

Important efforts have been made over the past years to improve the drug acts,which leads to the discovery of novel drug preparations and delivery *** optimal design of such processes requires a molecular-level understanding of the interactions between drug molecules and biological *** thermodynamic investigation provides deep and complete knowledge of interactions and the choice of appropriate and suitable production compounds in pharmaceutical ***,the analysis of drugs+co-solvents in aqueous media is the central issue in many types of research because they exert their impact by interacting with biological *** work is aimed to measure the density and speed of sound for the thiamine hydrochloride in water+deep eutectic solvents(DESs)mixtures(choline chloride/urea,choline chloride/ethylene glycol and choline chloride/glycerol)at temperature range(293.15-308.15)*** correlation of the evaluated parameters in some standard relations,the partial molar parameters *** molar volumes,Vφ,m,and apparent molar isentropic compression,κ_(s,φ,m),are *** addition,apparent molar isobaric expansion,E^(0)_(φ,m),and Hepler’s constant are computed from the density and speed of sound *** fitting the experimental Vφ,m andκ_(s,φ,m)the Redlich-Meyer equation was employed that the important quantities;standard partial molar volume,V^(0)_(m),and partial molar isentropic compression,κφ,m0,were *** thermodynamic analysis of the studied system also plays a crucial role in the pharmaceutical industry.

关键词： Deep eutectic solvents Thiamine hydrochloride Density Speed of sound Redlich-Meyer equation

Synthesis, Characterization and Electrochemical Study of Graphene Oxide-Multi Walled Carbon Nanotube-Manganese Oxide-Polyaniline Electrode as Supercapacitor

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Journal of Materials Science & Technology 2016年第8期32卷 763-773页

作者： Mir Ghasem Hosseini Elham Shahryari Electrochemistry Research Laboratory Department of Physical Chemistry Chemistry Faculty University of Tabriz

The synthesis of graphene oxide-multi walled carbon nanotube-manganese oxide-polyaniline namely （GMMP） nanocomposite for application in supercapacitor devices was investigated. Morphology of the nanocomposites was studied by X-ray diffraction （XRD）, Fourier transform infrared （FT-IR） spectrosco- py, scanning electron microscopy （SEM）, transmission electron microscopy （TEM） and energy dispersive X-ray micmanalysis （EDX）. The electrochemical properties of nanocomposite based electrodes were in- vestigated by cyclic voltammetry （CV）, galvanostatic charge-discharge and electrochemical impedance spectroscopy （EIS） techniques in 0.5 mol/L Na2SO4. The specific capacitances of 173.00, 127.85, 87.50, 58.65 and 12.00 （mF cm^-2） were obtained for GMMP, GMP （GO-MWCNT-PANI）, GMM （GO-MWCNT-MnO2）, GM （GO-MWCNT） and G （GO） at a scan rate of 10 mV s^-1, respectively. Also, GMMP nanocomposite re- tained 90% initial capacitance after 200 cycle of charge-discharge. The good electrochemical response of this nanocomposite is due to the combination of the electrical double layer capacitance of GO and MWCNT and the gradual introduction of pseudo-capacitance through the redox processes of PANI, -COOH, -OH （in MWCNT-COOH, GO-COOH and GO-OH） and MnO2. This revealed the synergistic effect of PANI, MnO2, -OH -COOH on the carbon based support.

关键词： Supercapacitor Graphene oxide In-situ polymerization Electrochemical Impedance Spectroscopy (EIS) Polyaniline

Corrosion Protection of Electro-Galvanized Steel by Green Conversion Coatings

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Journal of Rare Earths 2007年第5期25卷 537-543页

作者： Mirghasem Hosseini Habib Ashassi-Sorkhabi Heshmat Allah Yaghobkhani Ghiasvand Electrochemistry Research Laboratory Physical Chemistry Department Chemistry Faculty University of Tabriz

A A cerium-based chemical conversion process was studied. First, zinc coating obtained from a free-cyanide alkaline bath, with derivative of imidazol with new brightener, was investigated, zinc-plated steel specimens were treated with a solution of 50 mmol· L^-1 Ce（NO3 ）3 The corrosion behavior of bare and treated mild galvanized steel was evaluated during exposure to 0.5 mol · L^-1 NaCl for different immersion time, using Tafel polarization curves and electrochemical impedance spectroscopy （EIS） measurements. The surface morphology of the coating was studied using scanning electron microscopy （SEM）. The composition and chemical percent of the coating were examined by X-ray dispersion energy （EDAX）. The results of these measurements showed that the newly developed cerium-based conversion coating process was a promising candidate for replacing the conventional chromate treatments used at present for galvanized steel.

关键词： green coating free-cyanide alkaline bath EIS electro-galvanized rare earths

Benzene selective hydrogenation over supported Ni(nano-) particles catalysts: Catalytic and kinetics studies

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Chinese Journal of Chemical Engineering 2018年第3期26卷 521-528页

作者： M.H.Peyrovi N.Parsafard Z.Mohammadian Faculty of chemistry Science and Petroleum Department of Physical Chemistry University of Shahid Beheshti Kosar university of Bojnord Department of Applied Chemistry

This report aims to reduce the benzene in a mixture of benzene and toluene as a model reaction using catalytic hydrogenation. In this research, we developed a series of catalysts with different supports such as Ni/HMS, Ni/HZSM-5, Ni/HZSM5-HMS, Ni/Al2O3 and Ni/SiO2. Kinetic of this reaction was investigated under various hydrogen and benzene pressures. For more study, two kinetic models have also been selected and tested to describe the kinetics for this reaction. Both used models, the power law and Langmuir-Hinshelwood, provided a good fit toward the experimental data and allowed to determine the kinetic parameters. Among these catalysts, Ni/Al2O3 showed the maximum benzene conversion （99.19%） at 130℃ for benzene hydrogenation. The lowest toluene conversion was observed for Ni/SiO2. Furthermore, this catalyst presented high selectivity to benzene （75.26%） at 130℃. The catalytic performance （activity, selectivity and stability） and kinetics evaluations were shown that the Ni/SiO2 is an effective catalyst to hydrogenate benzene. It seems that the surface properties particularly pore size are effective parameter compared to other factors such as acidity and metal dispersion in this process.

关键词： Catalytic hydrogenation Power law model Langmuir-Hinshelwood mode Selectivity Kinetics