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Online since: March 2015
Authors: Sergey Prokoshkin, Karine Inaekyan, Mikhail Petrzhik, Mikhail Filonov, Yuriy Pustov, Sergey Dubinskiy, Andrey Korotitskiy, Vadim Sheremetyev, Vladimir Brailovski, Yulia S. Zhukova
Effect of thermomechanical treatment on structure and functional properties.
Surface structure and properties.
Thermomechanical Treatment and Functional Properties Structure formation after TMT.
Filonov, Kinetic Regularities and Mechanism of Formation of Nanosize Passive Films on Titanium Alloys for Medical Application and Their Electrochemical Behavior in Simulated Physiological Media, Protection of Metals and Physical Chemistry of Surfaces 48 (2012) 315-321
Filonov, The Role of Martensitic Transformation in Corrosion Fatigue Failure of Ti–22 Nb–6 Ta and Ti–22 Nb–6 Zr (at %) Medical Alloys, Protection of Metals and Physical Chemistry of Surfaces 50 (2014) 524-529
Surface structure and properties.
Thermomechanical Treatment and Functional Properties Structure formation after TMT.
Filonov, Kinetic Regularities and Mechanism of Formation of Nanosize Passive Films on Titanium Alloys for Medical Application and Their Electrochemical Behavior in Simulated Physiological Media, Protection of Metals and Physical Chemistry of Surfaces 48 (2012) 315-321
Filonov, The Role of Martensitic Transformation in Corrosion Fatigue Failure of Ti–22 Nb–6 Ta and Ti–22 Nb–6 Zr (at %) Medical Alloys, Protection of Metals and Physical Chemistry of Surfaces 50 (2014) 524-529
Online since: September 2012
Authors: Yuichi Ohya, Hiroyuki Suzuki, Koji Nagahama, Akihiro Takahashi, Tatsuro Ouchi, Akinori Kuzuya
Design of Biodegradable Injectable Polymers Exhibiting Temperature-Responsive Sol-Gel Transition
Yuichi Ohya1,2, a, Hiroyuki Suzuki1, Koji Nagahama3, Akihiro Takahashi2,
Tatsuro Ouchi1, and Akinori Kuzuya1,2
1Department of Chemistry and Materials Engineering, Kansai University, 3-3-35 Yamate, Suita, Osaka 564-8680, Japan
2ORDIST, Kansai University, 3-3-35 Yamate, Suita, Osaka 564-8680, Japan
3Department of Nanobiochemistry, Frontiers Innovative Research in Science and Technology (FIRST), Konan University, 7-1-20 Minatojimaminamimachi, Chuo-ku, Kobe 650-0047, Japan
ayohya@kansai-u.ac.jp
Keywords: Injectable polymers; Biodegradable polymers; Temperature-responsive sol-gel transition; Poly(ethylene glycol); Polylactide; Stereocomplex
Abstract.
Generally, amphiphilic copolymers consisting of hydrophilic PEG and hydrophobic aliphatic polyesters are considered to form a micelle-like core-shell structure in aqueous solution below the transition temperature, and exhibit a sol-gel transition in response to increasing temperature.
Structure of 8-arm PEG-b-PL(D)LA-b-PEG We have attempted to combine temperature-responsive sol-gel transition with two-solution stereocomplex formation to obtain a PEG/PLA-based system exhibiting instant gelation and higher mechanical strength in the hydrogel state.
These properties are considered to be based on stereocomplex formation and the branched structure of the copolymer, which results in the formation of a strong and effective crosslinked network.
Generally, amphiphilic copolymers consisting of hydrophilic PEG and hydrophobic aliphatic polyesters are considered to form a micelle-like core-shell structure in aqueous solution below the transition temperature, and exhibit a sol-gel transition in response to increasing temperature.
Structure of 8-arm PEG-b-PL(D)LA-b-PEG We have attempted to combine temperature-responsive sol-gel transition with two-solution stereocomplex formation to obtain a PEG/PLA-based system exhibiting instant gelation and higher mechanical strength in the hydrogel state.
These properties are considered to be based on stereocomplex formation and the branched structure of the copolymer, which results in the formation of a strong and effective crosslinked network.
Green Energy Anode Materials: Pyrolytic Carbons Derived from Peanut Shells for Lithium Ion Batteries
Online since: December 2011
Authors: George Ting Kuo Fey, Yu Yen Lin, Kai Pin Huang, Yi Chuan Lin, T. Prem Kumar, Yung Da Cho, Hsien Ming Kao
Kumar1, Yung-Da Cho1 and Hsien-Ming Kao2
1Department of Chemical and Materials Engineering, National Central University, Chung-Li, Taiwan 320 R.O.C.
2Department of Chemistry, National Central University, Chung-Li, Taiwan 320 R.O.C.
Thus, the electrochemical lithium insertion properties of disordered carbons seem to be dictated by the carbon network structure [26, 27].
The general absence of distinguishable peaks results from the disordered structure of the carbons, which bestows a broad spectrum of lithium accommodation energies by virtue of the presence of electronically and geometrically non-equivalent sites.
According to Gnanaraj et al. [36], the small sizes of the graphene flake fragments in disordered carbons, considered to be packed in a butterfly-like structure [37], and the lack of long-range order preclude staging behavior during the insertion and deinsertion processes.
Thus, the electrochemical lithium insertion properties of disordered carbons seem to be dictated by the carbon network structure [26, 27].
The general absence of distinguishable peaks results from the disordered structure of the carbons, which bestows a broad spectrum of lithium accommodation energies by virtue of the presence of electronically and geometrically non-equivalent sites.
According to Gnanaraj et al. [36], the small sizes of the graphene flake fragments in disordered carbons, considered to be packed in a butterfly-like structure [37], and the lack of long-range order preclude staging behavior during the insertion and deinsertion processes.
Online since: April 2013
Authors: Dhanya Sunil
Recennt advances on Chitosan-Metal Oxide Nanoparticles and their biological Application
Dhanya Sunil
1Department of Chemistry, Manipal Institute of Technology, Manipal University, 576 104, Manipal, Karnataka, India.
One of the reasons behind the extreme interest is that nanotechnology permits the controlled synthesis of materials where at least one dimension of the structure is less than 100 nm.
The reduction of materials alter their electrical, magnetic, structural, morphological, and chemical properties enabling them to interact in unique ways with cell biomolecules and aid their physical transport into the interior structures of cells.
Hb in the film retained the native structure and the fabricated CH/nano-TiO2/Hb/CILE (Fig.4) showed good electrocatalytic ability to the reduction of trichloroacetic acid (TCA) and H2O2, which exhibited a potential application in fabricating a new kind of third generation biosensor.
One of the reasons behind the extreme interest is that nanotechnology permits the controlled synthesis of materials where at least one dimension of the structure is less than 100 nm.
The reduction of materials alter their electrical, magnetic, structural, morphological, and chemical properties enabling them to interact in unique ways with cell biomolecules and aid their physical transport into the interior structures of cells.
Hb in the film retained the native structure and the fabricated CH/nano-TiO2/Hb/CILE (Fig.4) showed good electrocatalytic ability to the reduction of trichloroacetic acid (TCA) and H2O2, which exhibited a potential application in fabricating a new kind of third generation biosensor.
Online since: June 2013
Authors: Gang Cheng, Jean Claude Gelin, Thierry Barrière
The hot embossing process is based on the replication of a master structure into the polymer material [8].
Finally the mould is opened to obtain the polymer component with micro structured cavities.
Zhu, Understanding the nature of viscoelasticity of polymer based on relaxation time defined from Maxwell model, Chemistry Online 9 (2004) 705-706
Richards, Internal friction and dynamic modulus transitions in hardened cement paste at low temperatures, Materials and Structures 2 (1969) 17-22
Finally the mould is opened to obtain the polymer component with micro structured cavities.
Zhu, Understanding the nature of viscoelasticity of polymer based on relaxation time defined from Maxwell model, Chemistry Online 9 (2004) 705-706
Richards, Internal friction and dynamic modulus transitions in hardened cement paste at low temperatures, Materials and Structures 2 (1969) 17-22
Online since: May 2024
Authors: Gabriel V. Buzato, Pedro H.P. Olívio, Adriano L. Souza
The structure of the MO dye is shown in Fig. 1.
Chemical structure for methyl Orange dye.
MATERIAL CONCENTRATION [mg L-1] R2 EXPERIMENTAL qe [mg g-1] k2[s g mg-1] Reference SiO2-CTAB 10 1.0 4.43 2.50×10-2 This work Carbon nanotubes 40 0.99 64.7 3.85×10-5 [44] Zeolitic imidazolate structure containing Cadmium 200 0.99 39.4 1.33×10-4 [4] MnFe2O4 – chitosan composite 100 1.0 24,.4 5.23×10-4 [45] Figs. 9a and 9b show the fitting of the experimental data to the Langmuir isotherm model for the SiO2-UN and SiO2-CTAB xerogels, respectively.
Scherer, Sol-Gel Science: The Physics and Chemistry of Sol-Gel Processing, first ed., Academic Press, Harcourt Brace Jovanovich Publishers, Boston, San Diego, New York, London, Sydney, Tokyo, Toronto, 1990
Chemical structure for methyl Orange dye.
MATERIAL CONCENTRATION [mg L-1] R2 EXPERIMENTAL qe [mg g-1] k2[s g mg-1] Reference SiO2-CTAB 10 1.0 4.43 2.50×10-2 This work Carbon nanotubes 40 0.99 64.7 3.85×10-5 [44] Zeolitic imidazolate structure containing Cadmium 200 0.99 39.4 1.33×10-4 [4] MnFe2O4 – chitosan composite 100 1.0 24,.4 5.23×10-4 [45] Figs. 9a and 9b show the fitting of the experimental data to the Langmuir isotherm model for the SiO2-UN and SiO2-CTAB xerogels, respectively.
Scherer, Sol-Gel Science: The Physics and Chemistry of Sol-Gel Processing, first ed., Academic Press, Harcourt Brace Jovanovich Publishers, Boston, San Diego, New York, London, Sydney, Tokyo, Toronto, 1990
Online since: June 2025
Authors: Ahmad Taufiq, Miftakhul Rohmah, Sunaryono Sunaryono, Muhammad Safwan Abd Aziz, Arif Hidayat, Ainun Nikmah
Fe3O4 has an inverted cubic spinel structure, where oxygen forms the cubic face center, while Fe cations occupy tetrahedral [Fe2+] sites and octahedral [Fe2+, Fe3+] sites [3], which are easily modified and combined with other materials for various applications, such as drug delivery systems.
Farghali, “Synthesis, Characterization, and In Vitro Anticancer Evaluation of Iron Oxide/Chitosan Nanocomposites,” Inorganic and Nano-Metal Chemistry, vol. 47, no. 3, pp. 405–411, Mar. 2017, doi: 10.1080/15533174.2016.1186064
Bruns, “Infrared Spectral Evidence and DFT Calculations of Hydrogen-Bonding and Molecular Structures of Acetogenins,” Journal of Molecular Structure, vol. 1130, pp. 174–180, Feb. 2017, doi: 10.1016/j.molstruc.2016.10.007
Farghali, “Synthesis, Characterization, and In Vitro Anticancer Evaluation of Iron Oxide/Chitosan Nanocomposites,” Inorganic and Nano-Metal Chemistry, vol. 47, no. 3, pp. 405–411, Mar. 2017, doi: 10.1080/15533174.2016.1186064
Bruns, “Infrared Spectral Evidence and DFT Calculations of Hydrogen-Bonding and Molecular Structures of Acetogenins,” Journal of Molecular Structure, vol. 1130, pp. 174–180, Feb. 2017, doi: 10.1016/j.molstruc.2016.10.007
Online since: November 2020
Authors: José Ângelo Camilli, Celso Aparecido Bertran, Mariana Motisuke, Ana Claudia de Souza, Craig McNulty
OBSERVATION PERIOD
GROUP α- TCP
GROUP α- TCPW
30
5 RATS
5 RATS
Preparation of Biomaterials
The material used in this study consists of a Wollastonite whisker-reinforced α-TCP-based CFC that was developed by the Institute of Chemistry of UNICAMP.
It is important the detailed knowledge about the interactions between material and living cells for creating and developing new materials that can carry living cells or growth factors that allow regeneration and not just the repair of damaged or worn structures and tissues[39] As they present characteristics of biocompatibility and bioactivity, whiskers can be a viable option to reinforce calcium phosphate cement, improving their mechanical properties without harming patients' health. [16] Conclusion An addition of wollastonite whisker in other biomaterials becomes a viable option because it is not cytotoxic; it is resorbable and stimulates bone neoformation, as found in this study.
Biology of bone tissue: structure, function, and factors that influence bone cells.
The effect of biomimetic apatite structure on osteoblast viability, proliferation, and gene expression.
It is important the detailed knowledge about the interactions between material and living cells for creating and developing new materials that can carry living cells or growth factors that allow regeneration and not just the repair of damaged or worn structures and tissues[39] As they present characteristics of biocompatibility and bioactivity, whiskers can be a viable option to reinforce calcium phosphate cement, improving their mechanical properties without harming patients' health. [16] Conclusion An addition of wollastonite whisker in other biomaterials becomes a viable option because it is not cytotoxic; it is resorbable and stimulates bone neoformation, as found in this study.
Biology of bone tissue: structure, function, and factors that influence bone cells.
The effect of biomimetic apatite structure on osteoblast viability, proliferation, and gene expression.
Online since: February 2021
Authors: Wan Maisarah Mukhtar, Nurul Husna Md Khairuddin Pang, Razman Mohd Halim
Metallic nanoparticles including metal oxide nanomaterials poss unique optical, electronic, chemical, and magnetic properties that are obviously different from their bulk structure [22-23].
Nowadays, fiber optics sensor is one of the alternative sensing device because of its simple structure, free from electromagnetic effect and low cost.
To enhance the sensitivity of these sensors through the amplification of evanescent field, major alteration on the fiber structure is required such as cladding’s removal via etching technique [28].
Food chemistry, 196, 309-323
Nowadays, fiber optics sensor is one of the alternative sensing device because of its simple structure, free from electromagnetic effect and low cost.
To enhance the sensitivity of these sensors through the amplification of evanescent field, major alteration on the fiber structure is required such as cladding’s removal via etching technique [28].
Food chemistry, 196, 309-323
Online since: September 2024
Authors: Rhonalyn V. Maulion, Maxine Ranses D. Danico, Amani Llanes, Lovely Charmaine B. Llave, Benjie M. Magwari
The effectiveness of silica nanoparticles in removing nitrate ions in wastewater is due to its porous structure and large surface area.
To increase the adsorption efficiency of silica nanoparticles in aqueous solution, a cationic quaternary ammonium compound like CTAB can be used in functionalizing the surface of silica nanoparticles to produce a mesoporous, hollow and core shell structure [7].
There is a distinct difference between the two especially in terms of function, the arrangement is different, but the molecular formula is the same [9], hence it is important to take note of the structure.
“Direct determination of nitrate in natural water by ultraviolet first derivative spectrometry”, Analytical Chemistry, An Indian Journal, 13(1), 69-76.2013
To increase the adsorption efficiency of silica nanoparticles in aqueous solution, a cationic quaternary ammonium compound like CTAB can be used in functionalizing the surface of silica nanoparticles to produce a mesoporous, hollow and core shell structure [7].
There is a distinct difference between the two especially in terms of function, the arrangement is different, but the molecular formula is the same [9], hence it is important to take note of the structure.
“Direct determination of nitrate in natural water by ultraviolet first derivative spectrometry”, Analytical Chemistry, An Indian Journal, 13(1), 69-76.2013