The Experts below are selected from a list of 324 Experts worldwide ranked by ideXlab platform

Hak Yong Kim - One of the best experts on this subject based on the ideXlab platform.

  • Electrospun Composite Nanofibers of polyacrylonitrile and Ag_2CO_3 nanoparticles for visible light photocatalysis and antibacterial applications
    Journal of Materials Science, 2015
    Co-Authors: Gopal Panthi, Soo-jin Park, Tae-woo Kim, Hae-jong Chung, Seong-tshool Hong, Mira Park, Hak Yong Kim
    Abstract:

    First time, polyacrylonitrile (PAN)/Ag_2CO_3 Composite Nanofibers (NFs) with uniformly distributed Ag_2CO_3 nanoparticles (NPs) inside polyacrylonitrile NFs were fabricated via simple and versatile technique; electrospinning of colloidal solution of PAN and Ag_2CO_3 NPs. In this work, Ag_2CO_3 NPs were synthesized by ion-exchange method between Ag(NH_3) _2 ^+ and NaHCO_3. The experimental result demonstrated that PAN/Ag_2CO_3 Composite NFs with average diameter of approximately 430 nm can exhibit good photocatalytic activity for the photodegradation of methyl red under visible light irradiation. In addition, thus obtained Composite NFs displayed enhanced antibacterial activities toward both gram-positive and gram-negative bacteria due to its photogenerated electron–hole pairs indicating that this sort of material may represent a new, promising alternative with a wide range of potential application in the field of water treatment.

  • Electrospun Composite Nanofibers of polyacrylonitrile and Ag 2 CO 3 nanoparticles for visible light photocatalysis and antibacterial applications
    Journal of Materials Science, 2015
    Co-Authors: Gopal Panthi, Soo-jin Park, Tae-woo Kim, Hae-jong Chung, Seong-tshool Hong, Mira Park, Hak Yong Kim
    Abstract:

    First time, polyacrylonitrile (PAN)/Ag2CO3 Composite Nanofibers (NFs) with uniformly distributed Ag2CO3 nanoparticles (NPs) inside polyacrylonitrile NFs were fabricated via simple and versatile technique; electrospinning of colloidal solution of PAN and Ag2CO3 NPs. In this work, Ag2CO3 NPs were synthesized by ion-exchange method between Ag(NH3)2+ and NaHCO3. The experimental result demonstrated that PAN/Ag2CO3 Composite NFs with average diameter of approximately 430 nm can exhibit good photocatalytic activity for the photodegradation of methyl red under visible light irradiation. In addition, thus obtained Composite NFs displayed enhanced antibacterial activities toward both gram-positive and gram-negative bacteria due to its photogenerated electron–hole pairs indicating that this sort of material may represent a new, promising alternative with a wide range of potential application in the field of water treatment.

  • Synthesis and characterization of Electrospun cadmium sulfide- and lead sulfide-blended poly(vinyl acetate) Composite Nanofibers
    Materials Science in Semiconductor Processing, 2014
    Co-Authors: Rajkumar Nirmala, Kyung Soo Jeon, R. Navamathavan, Hak Yong Kim, Soo-jin Park
    Abstract:

    Abstract We report the preparation of cadmium sulfide (CdS) and lead sulfide (PdS) nanoparticle-blended poly(vinylacetate) (PVA) Composite Nanofibers by using an electrospinning technique. The resultant Nanofibers were observed to be very smooth with uniform diameters ranging from 100 to 400 nm. The detailed analyses such as surface morphology, structure, bonding configuration, thermal, optical and electrical properties of the Electrospun Composite Nanofibers were characterized. The introduced CdS and PdS nanoparticles in PVA were significantly enhanced by the electrical property of the Composite Nanofibers. The electrical conduction mechanism was further evaluated by studying the Fowler–Nordheim plots. Overall, the feasibility of obtaining uniformly dispersed CdS and PdS nanoparticles in PVA Nanofibers can be useful for the realization of various nanotechnological device applications.

Seeram Ramakrishna - One of the best experts on this subject based on the ideXlab platform.

  • Modelling and Analysis of Elliptical Cantilever Device Using Flexure Method and Fabrication of Electrospun PVDF/BaTiO3 NanoComposites
    Nano, 2020
    Co-Authors: Ramadoss Tamil Selvan, W. A. D. M. Jayathilaka, Amutha Chinappan, Hilaal Alam, Seeram Ramakrishna
    Abstract:

    Cantilever-based piezoelectric has been the most preferred technique for energy harvesting and sensing application due to its simple design. The energy conversion efficiency has been continuously improved by exploring alternative cantilever geometries by increasing the stress distribution on the beam surface. In this paper, we have introduced half elliptical and full elliptical profile modification in the cantilever structure to improve and uniformly distribute the stress at the beam surface. Stress distribution characteristics of the modified cantilever beams were investigated and compared using finite element analysis. Based on the theoretical and finite element analysis, cantilever beams were fabricated using 3D print technology. Fabricated cantilever beams were then used to investigate the piezoelectric performances of polyvinylidene fluoride (PVDF) in Composite of barium titanate (BaTiO3) nanoparticles in the form of Electrospun Composite Nanofibers. FTIR analysis shows successful conversion of alpha phase to beta phase of PVDF and PVDF/BaTiO3 nanoComposites. During 6[Formula: see text]Hz cyclic actuating experiment, maximum voltage output of 0.15[Formula: see text]V and 1.5[Formula: see text]nA current output were observed. The concept was proposed to replace MEMS-based sensor in hand tremor quantification to assist Parkinson disease management.

  • Electrospun Composite Nanofibers and their multifaceted applications
    Journal of Materials Chemistry, 2012
    Co-Authors: Rishikesh Sahay, J. Sundaramurthy, J. Venugopal, P Suresh Kumar, Radhakrishnan Sridhar, Subodh Gautam Mhaisalkar, Seeram Ramakrishna
    Abstract:

    The re-exploration of the nanostructure production technique known as electrospinning was carried out in the past decade due to its simplicity and uniqueness of producing nanostructures. As nanotechnology is one of the most promising and growing technologies today, a large amount of work is being carried out in an extensive area and shows an extremely huge potential for miraculous works in the fields of medicine and biotechnology. These nanostructures were found to be of great significance because of their inherent properties such as large surface area to volume ratio and the engineered properties such as porosity, stability and permeability. The functionality and applicability of these nanostructures were further improved by incorporating secondary phases either during electrospinning or in the post-processing resulting in the Composite nanostructures. These secondary phases may include metal oxides, carbon nanotubes, precious metals, gold nanoparticles and hydroxyapatite. Nanofibrous materials that mimic the native extracellular matrix (ECM) and promote the adhesion of various cells are being developed as tissue-engineered scaffolds for the skin, bone, vasculature, heart, cornea, nervous system and other tissues. The article discusses in detail the applicability of these Composite fibers in energy, sensors, filters, biotechnology and details the technological issues, research challenges and future trends.

  • Electrospun Composite Nanofibers for Tissue Regeneration
    Journal of Nanoscience and Nanotechnology, 2011
    Co-Authors: Molamma P Prabhakaran, Laleh Ghasemi-mobarakeh, Seeram Ramakrishna
    Abstract:

    Nanotechnology assists in the development of bioComposite nanofibrous scaffolds that can react positively to changes in the immediate cellular environment and stimulate specific regenerative events at molecular level to generate healthy tissues. Recently, electrospinning has gained huge momentum with greater accessibility of fabrication of Composite, controlled and oriented Nanofibers with sufficient porosity required for effective tissue regeneration. Current developments include the fabrication of nanofibrous scaffolds which can provide chemical, mechanical and biological signals to respond to the environmental stimuli. These Nanofibers are fabricated by simple coating, blending of polymers/bioactive molecules or by surface modification methods. For obtaining optimized sur-face functionality, with specially designed architectures for the Nanofibers (multi-layered, core–shell, aligned), electrospinning process has been modified and simultaneous 'electrospin-electrospraying' process is one of the most lately introduced technique in this perspective. Properties such as poros-ity, biodegradation and mechanical properties of Composite Electrospun Nanofibers along with their utilization for nerve, cardiac, bone, skin, vascular and cartilage tissue engineering are discussed in this review. In order to locally deliver electrical stimulus and provide a physical template for cell proliferations, and to gain an external control on the level and duration of stimulation, electrically conducting polymeric Nanofibers are also fabricated by electrospinning. Electrospun polypyrrole (PPy) and polyaniline (PAN) based scaffolds are the most extensively studied Composite substrates for nerve and cardiac tissue engineering with or without electrical stimulations, and are discussed here. However, the major focus of ongoing and future research in regenerative medicine is to effec-tively exploit the pluripotent potential of Mesenchymal Stem Cell (MSC) differentiation on Composite nanofibrous scaffolds for repair of organs.

  • nanobioengineered Electrospun Composite Nanofibers and osteoblasts for bone regeneration
    Artificial Organs, 2008
    Co-Authors: Jayarama Reddy Venugopal, Sharon Low, Aw Tar Choon, Bharath A Kumar, Seeram Ramakrishna
    Abstract:

    Abstract:  Bone defects represent a medical and socioeconomic challenge. Engineering bioartificial bone tissues may help to solve problems related to donor site morbidity and size limitations. Nanofibrous scaffolds were Electrospun into a blend of synthetic biodegradable polycaprolactone (PCL) with hydroxyapatite (HA) and natural polymer gelatin (Gel) at a ratio of 1:1:2 (PCL/HA/Gel) compared to PCL (9%), PCL/HA (1:1), and PCL/Gel (1:2) Nanofibers. These fiber diameters were around 411 ± 158 to 856 ± 157 nm, and the pore size and porosity around 5–35 µm and 76–93%, respectively. The interconnecting porous structure of the nanofibrous scaffolds provides large surface area for cell attachment and sufficient space for nutrient transportation. The tensile property of Composite nanofibrous scaffold (PCL/HA/Gel) was highly flexible and allows penetrating osteoblasts inside the scaffolds for bone tissue regeneration. Fourier transform infrared analysis showed that the Composite nanofiber contains an amino group, a phosphate group, and carboxyl groups for inducing proliferation and mineralization of osteoblasts for in vitro bone formation. The cell proliferation (88%), alkaline phosphatase activity (77%), and mineralization (66%) of osteoblasts were significantly (P < 0.001) increased in Composite nanofibrous scaffold compared to PCL nanofibrous scaffolds. Field emission scanning electron microscopic images showed that the Composite Nanofibers supported the proliferation and mineralization of osteoblast cells. These results show that the fabrication of Electrospun PCL/HA/Gel Composite nanofibrous scaffolds has potential for the proliferation and mineralization of osteoblasts for bone regeneration.

  • Nanobioengineered Electrospun Composite Nanofibers and Osteoblasts for Bone Regeneration
    Artificial organs, 2008
    Co-Authors: Jayarama Reddy Venugopal, Sharon Low, Aw Tar Choon, A. Bharath Kumar, Seeram Ramakrishna
    Abstract:

    Abstract:  Bone defects represent a medical and socioeconomic challenge. Engineering bioartificial bone tissues may help to solve problems related to donor site morbidity and size limitations. Nanofibrous scaffolds were Electrospun into a blend of synthetic biodegradable polycaprolactone (PCL) with hydroxyapatite (HA) and natural polymer gelatin (Gel) at a ratio of 1:1:2 (PCL/HA/Gel) compared to PCL (9%), PCL/HA (1:1), and PCL/Gel (1:2) Nanofibers. These fiber diameters were around 411 ± 158 to 856 ± 157 nm, and the pore size and porosity around 5–35 µm and 76–93%, respectively. The interconnecting porous structure of the nanofibrous scaffolds provides large surface area for cell attachment and sufficient space for nutrient transportation. The tensile property of Composite nanofibrous scaffold (PCL/HA/Gel) was highly flexible and allows penetrating osteoblasts inside the scaffolds for bone tissue regeneration. Fourier transform infrared analysis showed that the Composite nanofiber contains an amino group, a phosphate group, and carboxyl groups for inducing proliferation and mineralization of osteoblasts for in vitro bone formation. The cell proliferation (88%), alkaline phosphatase activity (77%), and mineralization (66%) of osteoblasts were significantly (P 

Soo-jin Park - One of the best experts on this subject based on the ideXlab platform.

  • Electrospun Composite Nanofibers of polyacrylonitrile and Ag_2CO_3 nanoparticles for visible light photocatalysis and antibacterial applications
    Journal of Materials Science, 2015
    Co-Authors: Gopal Panthi, Soo-jin Park, Tae-woo Kim, Hae-jong Chung, Seong-tshool Hong, Mira Park, Hak Yong Kim
    Abstract:

    First time, polyacrylonitrile (PAN)/Ag_2CO_3 Composite Nanofibers (NFs) with uniformly distributed Ag_2CO_3 nanoparticles (NPs) inside polyacrylonitrile NFs were fabricated via simple and versatile technique; electrospinning of colloidal solution of PAN and Ag_2CO_3 NPs. In this work, Ag_2CO_3 NPs were synthesized by ion-exchange method between Ag(NH_3) _2 ^+ and NaHCO_3. The experimental result demonstrated that PAN/Ag_2CO_3 Composite NFs with average diameter of approximately 430 nm can exhibit good photocatalytic activity for the photodegradation of methyl red under visible light irradiation. In addition, thus obtained Composite NFs displayed enhanced antibacterial activities toward both gram-positive and gram-negative bacteria due to its photogenerated electron–hole pairs indicating that this sort of material may represent a new, promising alternative with a wide range of potential application in the field of water treatment.

  • Electrospun Composite Nanofibers of polyacrylonitrile and Ag 2 CO 3 nanoparticles for visible light photocatalysis and antibacterial applications
    Journal of Materials Science, 2015
    Co-Authors: Gopal Panthi, Soo-jin Park, Tae-woo Kim, Hae-jong Chung, Seong-tshool Hong, Mira Park, Hak Yong Kim
    Abstract:

    First time, polyacrylonitrile (PAN)/Ag2CO3 Composite Nanofibers (NFs) with uniformly distributed Ag2CO3 nanoparticles (NPs) inside polyacrylonitrile NFs were fabricated via simple and versatile technique; electrospinning of colloidal solution of PAN and Ag2CO3 NPs. In this work, Ag2CO3 NPs were synthesized by ion-exchange method between Ag(NH3)2+ and NaHCO3. The experimental result demonstrated that PAN/Ag2CO3 Composite NFs with average diameter of approximately 430 nm can exhibit good photocatalytic activity for the photodegradation of methyl red under visible light irradiation. In addition, thus obtained Composite NFs displayed enhanced antibacterial activities toward both gram-positive and gram-negative bacteria due to its photogenerated electron–hole pairs indicating that this sort of material may represent a new, promising alternative with a wide range of potential application in the field of water treatment.

  • Synthesis and characterization of Electrospun cadmium sulfide- and lead sulfide-blended poly(vinyl acetate) Composite Nanofibers
    Materials Science in Semiconductor Processing, 2014
    Co-Authors: Rajkumar Nirmala, Kyung Soo Jeon, R. Navamathavan, Hak Yong Kim, Soo-jin Park
    Abstract:

    Abstract We report the preparation of cadmium sulfide (CdS) and lead sulfide (PdS) nanoparticle-blended poly(vinylacetate) (PVA) Composite Nanofibers by using an electrospinning technique. The resultant Nanofibers were observed to be very smooth with uniform diameters ranging from 100 to 400 nm. The detailed analyses such as surface morphology, structure, bonding configuration, thermal, optical and electrical properties of the Electrospun Composite Nanofibers were characterized. The introduced CdS and PdS nanoparticles in PVA were significantly enhanced by the electrical property of the Composite Nanofibers. The electrical conduction mechanism was further evaluated by studying the Fowler–Nordheim plots. Overall, the feasibility of obtaining uniformly dispersed CdS and PdS nanoparticles in PVA Nanofibers can be useful for the realization of various nanotechnological device applications.

Gopal Panthi - One of the best experts on this subject based on the ideXlab platform.

  • Electrospun Composite Nanofibers of polyacrylonitrile and Ag_2CO_3 nanoparticles for visible light photocatalysis and antibacterial applications
    Journal of Materials Science, 2015
    Co-Authors: Gopal Panthi, Soo-jin Park, Tae-woo Kim, Hae-jong Chung, Seong-tshool Hong, Mira Park, Hak Yong Kim
    Abstract:

    First time, polyacrylonitrile (PAN)/Ag_2CO_3 Composite Nanofibers (NFs) with uniformly distributed Ag_2CO_3 nanoparticles (NPs) inside polyacrylonitrile NFs were fabricated via simple and versatile technique; electrospinning of colloidal solution of PAN and Ag_2CO_3 NPs. In this work, Ag_2CO_3 NPs were synthesized by ion-exchange method between Ag(NH_3) _2 ^+ and NaHCO_3. The experimental result demonstrated that PAN/Ag_2CO_3 Composite NFs with average diameter of approximately 430 nm can exhibit good photocatalytic activity for the photodegradation of methyl red under visible light irradiation. In addition, thus obtained Composite NFs displayed enhanced antibacterial activities toward both gram-positive and gram-negative bacteria due to its photogenerated electron–hole pairs indicating that this sort of material may represent a new, promising alternative with a wide range of potential application in the field of water treatment.

  • Electrospun Composite Nanofibers of polyacrylonitrile and Ag 2 CO 3 nanoparticles for visible light photocatalysis and antibacterial applications
    Journal of Materials Science, 2015
    Co-Authors: Gopal Panthi, Soo-jin Park, Tae-woo Kim, Hae-jong Chung, Seong-tshool Hong, Mira Park, Hak Yong Kim
    Abstract:

    First time, polyacrylonitrile (PAN)/Ag2CO3 Composite Nanofibers (NFs) with uniformly distributed Ag2CO3 nanoparticles (NPs) inside polyacrylonitrile NFs were fabricated via simple and versatile technique; electrospinning of colloidal solution of PAN and Ag2CO3 NPs. In this work, Ag2CO3 NPs were synthesized by ion-exchange method between Ag(NH3)2+ and NaHCO3. The experimental result demonstrated that PAN/Ag2CO3 Composite NFs with average diameter of approximately 430 nm can exhibit good photocatalytic activity for the photodegradation of methyl red under visible light irradiation. In addition, thus obtained Composite NFs displayed enhanced antibacterial activities toward both gram-positive and gram-negative bacteria due to its photogenerated electron–hole pairs indicating that this sort of material may represent a new, promising alternative with a wide range of potential application in the field of water treatment.

Komeil Nasouri - One of the best experts on this subject based on the ideXlab platform.

  • Synthesis of carbon nanotubes Composite Nanofibers for ultrahigh performance UV protection and microwave absorption applications
    Diamond and Related Materials, 2020
    Co-Authors: Komeil Nasouri, Ahmad Mousavi Shoushtari, Javad Mirzaei, Ali Akbar Merati
    Abstract:

    Abstract We report in this research the ultraviolet (UV) protection and microwave absorption properties of polyacrylonitrile (PAN)/multi-walled carbon nanotubes (MWCNTs) Composite Nanofibers based lightweight and flexible Composite structure. The morphological analysis of the synthesis Composite Nanofibers exposed that the Nanofibers average diameter decreases from 271 ± 32 to 161 ± 22 nm with increasing from 0 to 10 wt% MWCNTs content in solution. The increased content of MWCNTs in Composites leads to higher impact among them; then, better UV blocking properties were attained. The maximum UV protection (UPF) value of Composite Nanofibers reaches UPF = 677 with a thickness of 100 μm. The microwave absorption property of the Composite Nanofibers was examined in the X-band frequency range. The optimal microwave reflection loss value is −14.43 dB at 11.49 GHz in Composite Nanofibers containing 10 wt% MWCNTs. This research has expertly made known the potential of developing Electrospun Composite Nanofibers containing carbon nanotubes as lightweight and ultra-thin UV protection and microwave absorption materials.

  • Fabrication of Electrospun Composite Nanofibers Containing Carbon Nanotubes for Reversible Hydrogen Storage Applications
    2014
    Co-Authors: Komeil Nasouri, Ahmad Mousavi Shoushtari
    Abstract:

    In this research, Composite Nanofibers containing carbon nanotubes (CNT) were prepared by using electrospinning technique and hydrogen adsorption/desorption isotherms were carried out by a Sieverts apparatus at room temperature. The SEM analysis of the Nanofibers revealed that the deformation of the nanofiber increases with increasing CNT concentration. The diameter of neat Nanofibers was below 200 nm and had smooth surface. The surface of the Composite Nanofibers was rough even by adding low quantity of CNT. The hydrogen storage results showed an improvement in the adsorption capacity with increasing the CNT content in Composite Nanofibers. These Nanofibers were evacuated again to remove the adsorbed hydrogen at room temperature. Moreover, even though specific surface area and total pore volume were important factors for increasing the capacity of hydrogen adsorption. Finally, maximum adsorption capacity was 0.29 wt % in case of Nanofibers with 10 wt % CNT under 30 bar at 298 K.

  • Reversible Hydrogen Storage in Electrospun Composite Nanofibers
    2013
    Co-Authors: Aminoddin Haji, Komeil Nasouri, Ahmad Mousavi Shoushtari, Ali Kaflou
    Abstract:

    (Received 25 January 2013; revised manuscript received 24 August 2013; published online 27 August 2013) Composite Nanofibers containing single-walled carbon nanotubes (SWNT) were prepared by using elec-trospinning technique and hydrogen adsorption/desorption isotherms were carried out by a Sieverts appa-ratus at room temperature. The SEM analysis of the Nanofibers revealed that the deformation of the nano-fiber increases with increasing SWNT concentration. The diameter of neat Nanofibers was below 200 nm and had smooth surface. The surface of the Composite Nanofibers was rough even by adding low quantity of SWNT. The hydrogen storage results showed an improvement in the adsorption capacity with increasing the SWNT content in Composite Nanofibers. These Nanofibers were evacuated again to remove the ad-sorbed hydrogen at room temperature. Moreover, even though specific surface area and total pore volume were important factors for increasing the capacity of hydrogen adsorption. Finally, maximum adsorption capacity was 0.29 wt % in case of Nanofibers with 10 wt % SWNT under 30 bar at 298 K.

  • Single‐wall carbon nanotubes dispersion behavior and its effects on the morphological and mechanical properties of the Electrospun Nanofibers
    Polymer Composites, 2012
    Co-Authors: Komeil Nasouri, Ahmad Mousavi Shoushtari, Ali Kaflou, Hossein Bahrambeygi, Amir Rabbi
    Abstract:

    The dispersion behavior of single-walled carbon nanotube (SWCNT) has important effects on morphological and mechanical properties of SWCNT Composite Nanofibers. The relationship of the dispersion conditions with morphological and mechanical characteristics for SWCNT / polyacrylonitrile (PAN) / polyvinylpyrrolidone (PVP) Composite Nanofibers have been examined. The SEM and TEM analyses of the Nanofibers revealed that the deformation in the nanofiber structures increases with increasing concentration of SWCNTs. Tensile results showed that only 2 wt% SWCNT loading to the Electrospun Composite Nanofibers gave rise to 10-fold and 3-fold increase in the tensile modulus and tenacity of nanofiber layers, respectively. Essentially, high mechanical properties and uniform morphology of the Composite Nanofibers were found at SWCNT concentration of ∼2 wt% due to their stable and individual dispersion. POLYM. COMPOS., 33:1951–1959, 2012. © 2012 Society of Plastics Engineers