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Designing Materials for Hard Tissue Replacement
Shekhar Nath,Bikramjit Basu 한국세라믹학회 2008 한국세라믹학회지 Vol.45 No.1
In last two decades, an impresive progres has been recorded in terms of developing new .materials or refining existing mate-rial composition/microstructure in order to obtain better.performance in biomedical applications. The success of such effortsclearly demands better .understanding of various concepts, e.g. biocompatibility, host response, cell-biomaterial.interaction. In thisarticle, we review the fundamental understanding that is required with .respect to biomaterials development, as well as variousmaterials and their properties, which .placed to present various design aspects, in terms of materials processing, of ceramics and .polymer based biocomposites, Amongthe bioceramic composites, the research results.obtained with Hydroxyapatite (HAp)-based biomaterials with metallic (Ti) orceramic.(Mullite) reinforcements as wel as SiO 2-MgO-Al2O3-K2O-B2O3-F glas ceramics and .stabilized ZrO2 based bioinert ceram-.properties of Polyethylene (PE) based hybrid biocomposites are dis-cussed to illustrate the. concept on how can the physical/wear properties be enhanced along with biocompatibility . due tocombined addition of bioinert and bioactive ceramic to a bioinert polymeric matrix. .The tribological and corrosion properties ofsome important orthopedic metallic alloys based .on Ti or Co-Cr-Mo are also illustrated. At the close, the future perspective onorthopedic.biomaterials development and some unresolved issues are presented.
( Subir Paul ),( Bikramjit Kundu ) 한국부식방식학회(구 한국부식학회) 2018 Corrosion Science and Technology Vol.17 No.5
Metallic structures in the oil and gas production undergo severe degradation due to sweet and sour corrosion caused by the presence of CO<sub>2</sub> and H<sub>2</sub>S in the fluid environment. The corrosion behavior of 304 austenitic stainless was investigated in the presence of varying concentrations of CO<sub>2</sub> or H<sub>2</sub>S and CO<sub>2</sub> + H<sub>2</sub>S to understand the effect of the parameters either individually or in combination. Potentiodynamic polarization study revealed that a small amount of CO<sub>2</sub> aided in the formation of calcareous deposit of protective layer on passive film of 304 steel, while increase in CO<sub>2</sub> concentration ruptured the layer resulting in sweet corrosion. The presence of S<sup>2-</sup> damaged the passive and protective layer of the steel and higher levels increased the degradation rate. Electrochemical impedance studies revealed lower polarization resistance and impedance at higher concentration of CO<sub>2</sub> or H<sub>2</sub>S, supporting the outcomes of polarization study. XRD analysis revealed different types of iron carbides and iron sulphides corresponding to sweet and sour corrosion as the corrosion products, respectively. SEM analysis revealed the presence of uniform, localized and sulphide cracking in sour corrosion and general corrosion with protective carbide layer amid for sweet corrosion.
A new record of monogeneric family Vietnamellidae (Insecta: Ephemeroptera) from India
C. Selvakumar,Bikramjit Sinha,M. Vasanth,K.A. Subramanian,K.G. Sivaramakrishnan 한국응용곤충학회 2018 Journal of Asia-Pacific Entomology Vol.21 No.3
A new record of monogeneric family Vietnamellidae (Insecta: Ephemeroptera) is established for India with Vietnamella sp. A described based on the larvae from Arunachal Pradesh, India. This species can be distinguished from other known species of this genus in the larval stage by the following combination of characters: (i) outer pair of projections in head large and stout, triangular, cone-shaped with serrated spines; (ii) posterolateral angles of abdominal terga 2–9 extended into sharp projections; (iii) caudal filaments pale yellowish brown with dense lateral setae on inner and outer margins of middle part; (iv) femora of mid- and hind-legs broader; and (v) second segment of the maxillary palpi shorter than first segment.
Designing Materials for Hard Tissue Replacement
Nath, Shekhar,Basu, Bikramjit The Korean Ceramic Society 2008 한국세라믹학회지 Vol.45 No.1
In last two decades, an impressive progress has been recorded in terms of developing new materials or refining existing material composition/microstructure in order to obtain better performance in biomedical applications. The success of such efforts clearly demands better understanding of various concepts, e.g. biocompatibility, host response, cell-biomaterial interaction. In this article, we review the fundamental understanding that is required with respect to biomaterials development, as well as various materials and their properties, which are relevant in applications, such as hard tissue replacement. A major emphasize has been placed to present various design aspects, in terms of materials processing, of ceramics and polymer based biocomposites, Among the bioceramic composites, the research results obtained with Hydroxyapatite (HAp)-based biomaterials with metallic (Ti) or ceramic (Mullite) reinforcements as well as $SiO_2-MgO-Al_2O_3-K_2O-B_2O_3-F$ glass ceramics and stabilized $ZrO_2$ based bioinert ceramics are summarized. The physical as well as tribological properties of Polyethylene (PE) based hybrid biocomposites are discussed to illustrate the concept on how can the physical/wear properties be enhanced along with biocompatibility due to combined addition of bioinert and bioactive ceramic to a bioinert polymeric matrix. The tribological and corrosion properties of some important orthopedic metallic alloys based on Ti or Co-Cr-Mo are also illustrated. At the close, the future perspective on orthopedic biomaterials development and some unresolved issues are presented.