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  • 1
    Online Resource
    Online Resource
    Ammonia Gas Sensing Behavior of Hybridization between Reduced Graphene Oxide and Gold Nanoparticles
    Hindawi Limited ; 2020
    In:  Journal of Nanomaterials Vol. 2020 ( 2020-08-28), p. 1-11
    Details
    In: Journal of Nanomaterials, Hindawi Limited, Vol. 2020 ( 2020-08-28), p. 1-11
    Abstract: Stack and composite are the two ways of hybridization between gold nanoparticles (AuNPs) and reduced graphene oxide (rGO) which have been fabricated and tested the ability to detect NH 3 gas at room temperature. The device based on the rGO-AuNP composite structure exhibited the highest response and the fastest response and recovery time compared to stack and bare rGO. The red shift of a resonant peak in the absorption spectra and the negative shift in the binding energy of 4f 5/2 peak indicated that the remarkable NH 3 gas-sensing properties of this composite are mainly attributed to a chemical bonding formed between AuNPs and rGO at the defective sites. This type of interaction facilitates the electron transfer from the defect states to the AuNP surface wherein it easily reacts with the oxygen molecules in the atmosphere to create oxygen absorbents. Consequently, NH 3 not only reacts with sp 3 -hybridized atoms but also reacts primarily with oxygen absorbents on the surface of AuNPs, resulting in a better sensing behavior of composite samples.
    Type of Medium: Online Resource
    ISSN: 1687-4110 , 1687-4129
    URL: Article
    DOI: 10.1155/2020/7680508
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2020
    detail.hit.zdb_id: 2229480-6
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  • 2
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    Online Resource
    First Report on Association of Hyperuricemia with Type 2 Diabetes in a Vietnamese Population
    Hindawi Limited ; 2019
    In:  International Journal of Endocrinology Vol. 2019 ( 2019-09-02), p. 1-7
    Details
    In: International Journal of Endocrinology, Hindawi Limited, Vol. 2019 ( 2019-09-02), p. 1-7
    Abstract: Background . Uric acid is a powerful free-radical scavenger in humans, but hyperuricemia may induce insulin resistance and beta-cell dysfunction. The study aimed to evaluate the association between hyperuricemia and hyperglycemia, considering the confounding factors in a Vietnamese population. Methods . A population-based cross-sectional study recruited 1542 adults aged 50 to 70 years to collect data on socioeconomic status, lifestyle factors, and clinical patterns. Associations between hyperuricemia and hyperglycemia (isolated impaired fasting glucose (IFG), isolated impaired glucose tolerance (IGT), combined IFG-IGT, and type 2 diabetes (T2D)) were evaluated by multinomial logistic regression analysis in several models, adjusting for the confounding factors including socioeconomic status, lifestyle factors, and clinical measures. Results . Uric acid values were much higher in IFG, IFG-IGT, and T2D groups compared to those in the normal glucose tolerance (NGT) group. The significant association of hyperuricemia with IFG, IFG-IGT, and T2D was found in the model unadjusted and remained consistently in several models adjusted for socioeconomic status, lifestyle factors, and clinical patterns. In the final model, the consistent hyperglycemia risk was found in total sample (OR = 2.23 for IFG, OR = 2.29 for IFG-IGT, and 1.75 for T2D, P ≤ 0.006 ) and in women (OR = 2.90 for IFG, OR = 3.96 for IFG-IGT, and OR = 2.49 for T2D, P 〈 0.001 ) but not in men. Conclusions . It is the first report in Vietnamese population suggesting the significant association of hyperuricemia with IFG, IFG-IGT, and T2D; and the predominant association was found in women than in men, taken into account the confounding factors.
    Type of Medium: Online Resource
    ISSN: 1687-8337 , 1687-8345
    URL: Article
    DOI: 10.1155/2019/5275071
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2019
    detail.hit.zdb_id: 2502951-4
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  • 3
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    Online Resource
    Scalable Electrochemical Synthesis of Novel Biogenic Silver Nanoparticles and Its Application to High-Sensitive Detection of 4-Nitrophenol in Aqueous System
    Hindawi Limited ; 2021
    In:  Advances in Polymer Technology Vol. 2021 ( 2021-1-16), p. 1-9
    Details
    In: Advances in Polymer Technology, Hindawi Limited, Vol. 2021 ( 2021-1-16), p. 1-9
    Abstract: This study reports a scalable green electrochemical synthesis of novel biogenic silver nanoparticles colloid (biogenic AgNPs) in large scale up to 5 liters using the bulk silver bar and the green tea leaves (Camellia sinensis) extract (GTE) as reducing agent during the electrochemical process. Under a direct-current voltage source, the biomolecules in GTE can release electrons to promote the reducing process of Ag+ to Ag0. More interestingly, the formation of the intermediate complex helps to cap on the nanoparticles, which leads to stabilizing AgNPs. The as-synthesized biogenic AgNPs with the size of 34 nm exhibit the outstanding electrochemical properties due to the presence of biomolecules on the biogenic AgNPs surface, which facilitates the effective attaching of AgNPs on the carbon surface of the screen-printed carbon electrode (SPE) through the formation of the strong C-O coordinate bonds between O atom of oxygen functional groups and C atom of SPE. The electrochemical properties of the biogenic AgNPs-modified SPE are enhanced significantly in comparison with bare SPE and pure AgNPs-SPE. The biogenic AgNPs-SPE is applied successfully to the detection of 4-nitrophenol (4-NP). The electrochemical sensor using biogenic AgNPs can reliably detect 4-NP in the linear range from 0.1 to 25 μM with the sensitivity about 6.69 μA μM-1 cm-2. The present work reveals, as the greener synthesis method with ultra-large scalable ability, high purity, and excellent electrochemical properties of biogenic AgNPs is very promising for technological applications in high-sensitive electrochemical chemosensors, nanopharmaceuticals, and other fields.
    Type of Medium: Online Resource
    ISSN: 1098-2329 , 0730-6679
    URL: Article
    DOI: 10.1155/2021/6646219
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2021
    detail.hit.zdb_id: 2014633-4
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  • 4
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    Online Resource
    Determination of Cobalt in Seawater Using Neutron Activation Analysis after Preconcentration by Adsorption onto γ -MnO 2 Nanomaterial
    Hindawi Limited ; 2018
    In:  Journal of Chemistry Vol. 2018 ( 2018), p. 1-8
    Details
    In: Journal of Chemistry, Hindawi Limited, Vol. 2018 ( 2018), p. 1-8
    Abstract: The γ - M n O 2 nanomaterial has been used to adsorb cobalt in the seawater at Phan Thiet City, Binh Thuan Province, Vietnam. Its concentration is determined by using the neutron activation analysis (NAA) method at the Dalat nuclear research reactor. Factors affecting the uptake of cobalt on the γ - M n O 2 material such as the pH, adsorption time, and initial cobalt(II) concentration are investigated. The irradiated experiment data are calculated using the K0-Dalat program. The results obtained show that the trace dissolved cobalt in Phan Thiet seawater is found equal to 0.25 ± 0.04  μ g/L ( n = 5 , P = 95 %) with the adsorption efficiency being higher than 95% ( n = 4 , P = 95 %).
    Type of Medium: Online Resource
    ISSN: 2090-9063 , 2090-9071
    URL: Article
    DOI: 10.1155/2018/9126491
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2018
    detail.hit.zdb_id: 2393625-3
    detail.hit.zdb_id: 2703077-5
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  • 5
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    Online Resource
    Synthesis of Magnesium Oxide Nanoplates and Their Application in Nitrogen Dioxide and Sulfur Dioxide Adsorption
    Hindawi Limited ; 2019
    In:  Journal of Chemistry Vol. 2019 ( 2019-05-26), p. 1-9
    Details
    In: Journal of Chemistry, Hindawi Limited, Vol. 2019 ( 2019-05-26), p. 1-9
    Abstract: In this research, nanostructured magnesium oxide was synthesized through the sol-gel calcination or hydrothermal calcination method using various surfactants. The X-ray diffraction pattern of the materials confirmed that all the prepared magnesium oxide samples were single phase without any impurity. The scanning electron microscopy images and specific surface area values showed that sodium dodecyl sulfate was the most suitable surfactant for the synthesis of magnesium oxide nanoplates with the diameter of 40–60 nm, the average thickness of 5 nm, and a specific surface area of 126 m 2 /g. This material was utilized for nitrogen dioxide and sulfur dioxide adsorption under ambient condition. The saturated adsorption capacities of magnesium oxide were 174 mg/g for nitrogen dioxide and 160 mg/g for sulfur dioxide, making the magnesium oxide nanoplates a promising candidate for toxic gas treatment.
    Type of Medium: Online Resource
    ISSN: 2090-9063 , 2090-9071
    URL: Article
    DOI: 10.1155/2019/4376429
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2019
    detail.hit.zdb_id: 2393625-3
    detail.hit.zdb_id: 2703077-5
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  • 6
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    Online Resource
    Nanomaterials for Biomedical Applications and Environmental Monitoring
    Hindawi Limited ; 2015
    In:  Journal of Nanomaterials Vol. 2015 ( 2015), p. 1-2
    Details
    In: Journal of Nanomaterials, Hindawi Limited, Vol. 2015 ( 2015), p. 1-2
    Type of Medium: Online Resource
    ISSN: 1687-4110 , 1687-4129
    URL: Article
    DOI: 10.1155/2015/283286
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2015
    detail.hit.zdb_id: 2229480-6
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  • 7
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    Online Resource
    Impact of Health Insurance on Health Care Utilisation and Out-of-Pocket Health Expenditure in Vietnam
    Hindawi Limited ; 2020
    In:  BioMed Research International Vol. 2020 ( 2020-08-26), p. 1-16
    Details
    In: BioMed Research International, Hindawi Limited, Vol. 2020 ( 2020-08-26), p. 1-16
    Abstract: Background . In recent years, health insurance (HI) has been chosen by many low- and middle-income countries to obtain an important health policy target—universal health coverage. Vietnam has recently introduced the Revised Health Insurance Law, and the effects of the voluntary health insurance (VHI) and heavily subsidised health insurance (HSHI) programmes have not yet been analysed. Therefore, this study is aimed at examining the impact of these HI programmes on the utilisation of health care services and out-of-pocket health expenditure (OOP) in general and across different health care providers in particular. Methods . Using the two waves of Vietnam Household Living Standard Surveys 2014 and 2016 and the difference-in-difference method, the impacts of VHI and HSHI on health care utilisation and OOP in Vietnam were estimated. Results . For both the VHI and HSHI groups, we found that HI increased the probability of seeking outpatient care, the mean number of outpatient visits, the total number of visits, and the mean number of visits at the district level of health care providers in the last 12 months. However, there was no evidence that the HSHI programmes increased the mean number of inpatient visits and the number of visits at the provincial hospital. We also found that while the VHI programme reduced OOP for both outpatient and inpatient care, the HSHI scheme did not result in a reduction in OOP for hospitalisation, although HI lowered the total OOP. Similarly, we found that for both groups, HI reduced OOP when the insured visited district and provincial hospitals. However, the statistically significant impact was not demonstrated when the enrolees of HSHI programmes visited provincial hospitals. Conclusion . The study offers evidence that the Vietnamese HI scheme increased health care service utilisation and decreased OOP for the participants of the VHI and HSHI programmes. Therefore, the government should continue to consider improving the HI system as a strategy to achieve universal health coverage.
    Type of Medium: Online Resource
    ISSN: 2314-6133 , 2314-6141
    URL: Article
    DOI: 10.1155/2020/9065287
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2020
    detail.hit.zdb_id: 2698540-8
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  • 8
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    Biosynthesis of Zinc Oxide Nanoparticles Using Aqueous Piper betle Leaf Extract and Its Application in Surgical Sutures
    Hindawi Limited ; 2021
    In:  Journal of Nanomaterials Vol. 2021 ( 2021-2-12), p. 1-15
    Details
    In: Journal of Nanomaterials, Hindawi Limited, Vol. 2021 ( 2021-2-12), p. 1-15
    Abstract: Surgical site infection (SSI), mainly caused by Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli), is considered the most frequent complication in a surgical patient. Globally, surgical site infection accounts for 2.5%-41.9% and even higher rates in developing countries. SSI affects not only the patient’s health but also the development of society. Like previous reports, a surgical suture increases the hazard of SSI due to its structure. The antibacterial suture is the most effective solution to decrease the SSI. Due to some unique properties, nano-zinc oxide (ZnO NPs) is one of the promising antibacterial agents for coating on the suture. In this study, we aim to synthesize the ZnO NPs using Piper betle leaf extract and used it to coat the suture. The effect of synthesis parameters on the size and morphology of ZnO NPs was studied as well. The UV-Vis spectrum indicated the formation of ZnO NPs with λ max at around 370 nm. The volume of leaf extract plays a role in controlling the size and morphology of zinc oxide nanoparticles. The average particle size of as-synthesized ZnO NPs was around 112 nm with a hexagonal and spherical shape. Other than that, the results proved that ZnO NPs performed a high antibacterial activity against S. aureus and E. coli with its antibacterial effectiveness up to 5 days. The ZnO NP-coated sutures also exhibited a high performance on bacterial inactivation. With key findings, this study made a tremendous contribution to lowering the burden on medical services in terms of medical treatment cost in developing countries.
    Type of Medium: Online Resource
    ISSN: 1687-4129 , 1687-4110
    URL: Article
    DOI: 10.1155/2021/8833864
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2021
    detail.hit.zdb_id: 2229480-6
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  • 9
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    Online Resource
    The Facile Synthesis of Novel ZnO Nanostructure for Galactose Biosensor Application
    Hindawi Limited ; 2019
    In:  Journal of Nanomaterials Vol. 2019 ( 2019-02-25), p. 1-8
    Details
    In: Journal of Nanomaterials, Hindawi Limited, Vol. 2019 ( 2019-02-25), p. 1-8
    Abstract: We introduce a novel structure of ZnO nanorods (NRs) grown on ZnO NRs (ZnO NRs/NRs) via a facile, low-cost, and environmentally friendly synthesis for galactose biosensor application. The galactose oxidase enzyme (GalO x ) is immobilized on the ZnO NR/NR surface to form the novel electrode structure (GalO x |ZnO NRs/NRs). The GalO x |ZnO NR/NR electrode has a linear detection range of current density from 11.30  μ A/mm 2 to 18.16  μ A/mm 2 over a galactose concentration range from 40 mM to 230 mM, indicating the increment of electrode sensitivity up to 60.7%. The ZnO NR/NR morphology with a high surface area to volume ratio has a great contribution to the electrochemical performance of galactose biosensor. Our results propose a straightforward approach to fabricate architecturally ZnO-based nanostructure for biosensor application.
    Type of Medium: Online Resource
    ISSN: 1687-4110 , 1687-4129
    URL: Article
    DOI: 10.1155/2019/2364327
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2019
    detail.hit.zdb_id: 2229480-6
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  • 10
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    Online Resource
    Decoration of Silver Nanoparticles on Multiwalled Carbon Nanotubes: Antibacterial Mechanism and Ultrastructural Analysis
    Hindawi Limited ; 2015
    In:  Journal of Nanomaterials Vol. 2015 ( 2015), p. 1-11
    Details
    In: Journal of Nanomaterials, Hindawi Limited, Vol. 2015 ( 2015), p. 1-11
    Abstract: Recently, development of carbon nanocomposites composed of carbon nanostructures and metal nanoparticles has attracted much interests because of their large potential for technological applications such as catalyst, sensor, biomedicine, and disinfection. In this work, we established a simple chemistry method to synthesize multiwalled carbon nanotubes (MWCNTs) decorated with silver nanoparticles (Ag-NPs) using a modified photochemical reaction (Tollens process). The formation and interaction of Ag-NPs with functionalized groups on the surface of MWCNTs were analyzed by X-ray diffraction, transmission electron microscopy, Raman spectroscopy, and Fourier-transform infrared spectroscopy. The average size of Ag-NPs on the MWCNTs was approximately ~7 nm with nearly uniform size distribution. Antibacterial effect of Ag-MWCNTs nanocomposites was evaluated against two pathogenic bacteria including Gram-negative Escherichia Coli and Gram-positive Staphylococcus aureus bacteria. Interaction and bactericidal mechanism of Ag-MWCNTs with tested bacteria was studied by adapting the electron microscopy. Analysis on ultrastructural changes of bacterial cells indicates that antibacterial action mechanism of Ag-MWCNTs is physical interaction with cell membrane, the large formation of cell-Ag-MWCNTs aggregates, and faster destructibility of cell membrane and disruption of membrane function, hence resulting in cells death.
    Type of Medium: Online Resource
    ISSN: 1687-4110 , 1687-4129
    URL: Article
    DOI: 10.1155/2015/814379
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2015
    detail.hit.zdb_id: 2229480-6
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