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Wyświetlanie 1-15 z 17
Tytuł:
Chitosan-based nanocomposites modified with reduced graphene oxide prepared via green synthesis
Autorzy:
Kosowska, K.
Domalik-Pyzik, P.
Jagiełło, J.
Lipińska, L.
Chłopek, J.
Powiązania:
https://bibliotekanauki.pl/articles/284680.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
nanocomposites
graphene oxide
green synthesis
Źródło:
Engineering of Biomaterials; 2017, 20, no. 143 spec. iss.; 59
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Green chemistry for the preparation of silver nanoparticles using mint leaf leaves extracts and evaluation of their antimicrobial potential
Autorzy:
Aziz, Wisam J.
Jassim, Haneen A.
Powiązania:
https://bibliotekanauki.pl/articles/1112556.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Green synthesis
Mentha (Mint)
Silver Nanoparticles
Opis:
The aim of this study was to develop a green synthesis of silver nanoparticles using mint plant leaves extracts. The fresh suspension of plant extracts was yellowish-green in color. However, after the addition of AgNO3 within 15min, the suspension showed a change in color to dark brown after 5 hours of incubation at room temperature. The formation of silver nanoparticles was confirmed using UV-Vis spectral analysis and revealed silver surface plasmon resonance band to be in a range around 200-500 nm. The XRD pattern showed the characteristic bragg peaks of (111), (200) and (220) planes of the face center cubic (FCC) silver nanoparticles AgNPS. Under scanning electron microscope (SEM), silver nanoparticles with a mean particle size of 26 nm and a spherical shape were most frequently observed. In testing, the synthesized AgNPs colloidal solution showed better antibacterial activity against both Gram-positive and Gram-negative bacterial strains. The diameter of the inhibition zones of AgNPs at 50 µg/ml concentration against bacterial strains such as Bacillus subtilis and Escherichia coli were 25 mm and 20 mm, respectively.
Źródło:
World News of Natural Sciences; 2018, 18, 2; 163-170
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Easy, Simplistic and Green Synthesis of Various Benzimidazole and Benzoxazole Derivatives Using PEG400 as a Green Solvent
Autorzy:
Khunt, M. D.
Kotadiya, V. C.
Viradiya, D. J.
Baria, B. H.
Bhoya, U. C.
Powiązania:
https://bibliotekanauki.pl/articles/411999.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
PEG-400
Benzimidazole
Benzoxazole
Green synthesis
Opis:
An improved environmentally benign procedure for the synthesis of various benzimidazole and benzoxazole derivatives using green solvent PEG400. We have optimized the reaction condition and it was found that PEG400 was believed to be best as compared to PEG200, PEG600 and PEG800 at 80 to 85 °C. This method provides a novel route for the synthesis of benzimidazole and benzoxazole derivatives. The main attractive features of this process are a mild reaction conditions, easy workup procedure and good to excellent yield. The structures of all the synthesized compounds were confirmed by 1H NMR, IR, MASS and Elemental Analysis.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 6; 61-68
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bio synthesis and characterization of silver nanoparticles using Lagenaria siceraria leaf extract and their antibacterial activity
Autorzy:
Anandh, B.
Muthuvel, A.
Emayavaramban, M.
Powiązania:
https://bibliotekanauki.pl/articles/412277.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
green synthesis
silver nanoparticles
Lagenaria siceraria
antibacteriala activity
Opis:
The present investigation demonstrates the formation of silver nanoparticles by the reduction of the aqueous silver metal ions during exposure to the Lagenaria siceraria leaf extract. The synthesized AgNPs have characterized by UV-visible spectroscopy, X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR) techniques. AgNPs formation has screened by UV-visible spectroscopy through colour conversion due to surface plasma resonance band at 427 nm. X-ray diffraction (XRD) confirmed that the resulting AgNPs are highly crystalline and the structure is face centered cubic (fcc). FT-IR spectrum indicates the presence of different functional groups present in the biomolecules capping the nanoparticles. Further, inhibitory activity of AgNPs and leaf extract were tested against human pathogens like gram-pastive (Staphylococcus aureus, Bacillus subtilis), gram-negative (Escherichia coli and Pseudomonas aeruginosa). The results indicated that the AgNPs showed moderate inhibitory actions against human pathogens than Lagenaria siceraria leaf extract, demonstrating its antimicrobial value against pathogenic diseases.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 19, 1; 35-45
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis of silver nanoparticles by aqueous extract of Zingiber officinale and their antibacterial activities against selected species
Autorzy:
Hussain, Zawar
Jahangeer, Muhammad
ur Rahman, Shafiq
Ihsan, Tamanna
Sarwar, Abid
Ullah, Najeeb
Aziz, Tariq
Alharbi, Metab
Alshammari, Abdulrahman
Alasmari, Abdullah F.
Powiązania:
https://bibliotekanauki.pl/articles/27315653.pdf
Data publikacji:
2023
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
Nanotechnology
Antibacterial activity
Silver-nanoparticles
green synthesis
Ginger
Opis:
Silver nanoparticles have special plasmonic and antibacterial characteristics that make them efficient in a variety of commercial medical applications. According to recent research, chemically synthesized silver nanoparticles are harmful even in low concentrations. It was crucial to identify appropriate synthesis methods that may have low costs and be nontoxic to the environment. Zingiber officinale (ginger) extracts used to prepare silver nanoparticles were inexpensive and environmentally friendly, and the best physicochemical characteristics were analyzed. Silver nanoparticles were characterized by using UV-visible spectroscopy, Scanning electron microscopy (SEM), and X-ray diffraction (XRD). The surface Plasmon resonance peak at 425 nm was observed using UV-Visible spectroscopy. Scanning electron microscopy observed that the nanoparticles were spherical and ranged in size from 5 to 35 nm. The XRD pattern values of 2θ: 38.2° , 46.3° , and 64.58° are used to determine the planes (111), (200), and (220). The silver nanoparticle’s existence was verified by the face-centered cubic (FCC). Silver nanoparticles were found to have antibacterial efficacy against gram-positive Staphylococcus and gram-negative bacteria such as Pseudomonas aeruginosa, Klebsiella Aerogenes, Salmonella, Staphylococcus and Escherichia coli. The antibacterial activity of silver nanoparticles was observed using the agar well diffusion (AWD) method at three different concentrations (100 μg/ ml, 75 μg/ml, and 50 μg/ml). The zone of inhibition measured against the bacterial strains pseudomonas Aeruginosa, Klebsiella aerogenes, Escherichia coli, Salmonella and Staphylococcus which were (18.4±1.25 mm, 16.9±0.74 mm, 14.8±1.25 mm), (16.8±0.96 mm, 14.6±0.76 mm, 14.0±1.15 mm), (19.7±0.76 mm, 18.2±0.66 mm, 15.4±1.15 mm), (16.6±0.67 mm, 14.2±0.23 mm, 12.8±0.78 mm) and (12±0.68 mm, 10±0.20 mm, 08±0.15 mm). These nanoparticles’ potent antibacterial properties may enable them to be employed as nanomedicines for a variety of gramnegative bacterial illness treatments.
Źródło:
Polish Journal of Chemical Technology; 2023, 25, 3; 23--30
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
PEG mediated eco-friendly one pot sunthesis of benzylamine coumarin derivatives using multicomponent reactant
Autorzy:
Viradiya, D. J.
Kotadiya, V. C
Khunt, M. D.
Baria, B. H.
Bhoya, U. C.
Powiązania:
https://bibliotekanauki.pl/articles/412545.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
one pot reaction
benzylamine coumarin derivative
green synthesis
PEG-400
Opis:
A green resourceful, eco-friendly and facile protocol was developed for the synthesis of benzylamine coumarin derivatives by the reaction of 4-hydroxy coumarin, secondary amine and aromatic aldehyde in the presence of PEG400 as a solvent as well as catalyst at room temperature. A wide range of functional groups were tolerated in the developed protocol. The structures of all the synthesized compounds were confirmed by 1H NMR, IR, MASS and Elemental Analysis. The target molecules were obtained in good to excellent yield applying this method.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 11, 2; 177-184
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Soymida febrifuga aqueous root extract maneuvered silver nanoparticles as mercury nanosensor and potential microbicide
Autorzy:
Sowmyya, T.
Lakshmi, G. Vijaya
Powiązania:
https://bibliotekanauki.pl/articles/1158479.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Characterization
Green synthesis
Mercury nanosensor
Microbicide
Silver nanoparticles
Soymida febrifuga
Opis:
The present communication reports a rapid, uncomplicated, sustainable and facile method of eco-friendly synthesis of silver nanoparticles (AgNPs). The pressing need for the development of benign, profitable and eco-friendly alternative routes has inspired researchers to explore plant extracts as safer replacements to hazardous chemicals. In the present study, a benign method of synthesis of AgNPs using Soymida febrifuga aqueous root extract has been developed. The characterization studies of synthesized AgNPs revealed spherical morphology and crystalline nature of AgNPs. The average particle size was 21.81 nm. The synthesized AgNPs were employed as mercury nanosensor for the selective and sensitive detection of toxic mercury ions in water and soil samples. The AgNPs showed a marked visual color change and change in surface plasmon resonance band on interaction with mercury ions. The greater selectivity of AgNPs towards mercury ions was observed. The limit of detection of mercury by 100 μL of colloidal AgNPs was found to be 2×10-4 M visually and 1.332×10-5 M spectrophotometrically in water samples and ×-4 M visually and 22.3×10-5 M spectrophotometrically in soil samples. The method makes use of a small quantity of AgNPs for detection of mercury in water and soil samples. The method proposed in the present study provides a rapid, selective and sensitive method for detection of mercury ions in environmental water and soil samples. The synthesized AgNPs were also used as effective microbicidal agents. The microbicidal potential of the synthesized AgNPs was checked against two gram positive and gram negative bacterial strains.
Źródło:
World Scientific News; 2018, 114; 84-105
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A novel study of pH influence on Ag nanoparticles size with antibacterial and antifungal activity using green synthesis
Autorzy:
Wisam, J. Aziz
Haneen, A. Jassim
Powiązania:
https://bibliotekanauki.pl/articles/1177924.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
AgNPs
Green synthesis
Hydrothermal
Silver nanoparticles
Zingiber Officinale (Ginger)
pH effect
Opis:
In this paper, the effect of pH on nanoparticles (AgNPs) using plants extracting has been investigated. The aqueous sol of AgNPs prepared at different pH values using hydrothermal method display different Surface Plasmon Resonance (SPR) behavior and the maximum absorption values were at pH = 14. AgNPs were characterized using X-Ray diffraction, UV-Vis spectroscopy and scanning electron microscope. Face-center cubic Ag nanoparticles with crystal size about 3.86 nm have been noticed. The absorption band showed that Ag has sharp curves in the ultraviolet and at the edge of the visible region. The SEM images showed cluster shaped nanoparticles, and when increasing the pH values, the result revealed the formation of larger nanoparticles cluster with more accurate crystallite sizes. The antimicrobial and antifungal activity was performed by Agar well diffusion assay against Escherichia coli, Bacillus subtilis and Candida albicans. The diameter of the inhibition zones of Ag NPs against the bacterial strains such as, Bacillus subtilis (31 mm) and Escherichia coli (30 mm) at 200 µg/ml concentration and the diameter of the inhibition zones of Ag NPs against the fungus strains such as, Candida albicans (36 mm) at the same concentration.
Źródło:
World Scientific News; 2018, 97; 139-152
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biosynthetic of Titanium Dioxide Nanoparticles Using Zizyphus Spina-Christi Leaves Extract: Properties
Autorzy:
Alobaidi, Tuqa B.
Alwared, Abeer I.
Powiązania:
https://bibliotekanauki.pl/articles/2025518.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
green synthesis
TiO2
Zizyphus Spina-Christi
band gap
XRD
FE-SEM
Opis:
The present project utilizes a straightforward, inexpensive, and environmentally friendly approach to produce Titanium dioxide nanoparticles utilizing Zizyphus Spina-Christi leaves (Z-TiO2). Ultra-Spectrophotometry (UV-Vis) was used to characterize the synthesized nanoparticles, which showed the production of nanoparticles at 320 nm absorbance. To investigate functional groups, Fourier Transform Infrared Spectroscopy (FTIR) has been used. The presence of Titanium Dioxide was verified using Energy Distribution X-ray Spectroscopy (EDS). Surface area is calculated using the Brunauer Emmett Teller (BET) formula. Images from Field Emission Electron Microscopy (FE-SEM) verified the nanoparticles' spherical shape and relatively homogenous size distribution. These findings demonstrated that the production of Z-TiO2 nanoparticles was successful.
Źródło:
Journal of Ecological Engineering; 2022, 23, 1; 315-324
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bioeffects of silver nanoparticles (AgNPs) synthesized by producer of biosurfactant Bacillus subtilis strain : in vitro cytotoxicity, antioxidant properties and metabolic activities of mammalian cells
Autorzy:
Chojniak-Gronek, Joanna Małgorzata
Jałowiecki, Łukasz
Płaza, Grażyna Anna
Powiązania:
https://bibliotekanauki.pl/articles/2203138.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
green synthesis
bio-AgNPs
in vitro cytotoxicity
antioxidant properties
PM-Ms
Biolog system
Opis:
The present study is focused on the evaluation of bioeffects of silver nanoparticles (AgNPs) synthesized by Bacillus subtilis strain I’-1a, the producer of iturin A lipopeptide biosurfactant. The following properties of biologically synthesized silver nanoparticles (bio-AgNPs) were evaluated: in vitro cytotoxicity, antioxidant properties, and metabolic activities of mammalian cells. As a control, chemically synthesized silver nanoparticles (chem-AgNPs) were used. In vitro, antioxidant activity of bio-AgNPs showed a significant effect on the scavenging of free radicals. Bio-AgNPs can be potent natural antioxidants and can be essential for health preservation against oxidative stress-related degenerative diseases, such as cancer. The cell viability of human skin fibroblasts NHDF was remarkably inhibited in the presence of both AgNPs. However, bio-AgNPs were more active than chem-AgNPs. In our experiment, microarrays PM-M1–PM-M4 were used to evaluate the growth of NHDF fibroblast cells in the presence of bio-AgNPs and chem-AgNPs. The NHDF fibroblast cells were more active in the presence of bio-AgNPs than in chem-AgNPs. Probably, the presence of biosurfactant produced by Bacillus subtilis I’-1a significantly increased the stability of biogenic AgNPs and enhanced their biological activities and specific interaction with human DNA. Furthermore, the evaluated biological activities were enhanced for the biosurfactant-based AgNPs.
Źródło:
Archives of Environmental Protection; 2022, 48, 4; 45--52
2083-4772
2083-4810
Pojawia się w:
Archives of Environmental Protection
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Green Synthesis of Copper Nanoparticles Using Ocimum sanctum L. (Tulsi) and Piper nigrum L. (Pepper Seed) for Pollution Free Environment
Autorzy:
Nirmala, M.
Kavitha, B.
Nasreen, S.
Kiruthika, S.
Divya, B.
Manochitra, E.
Powiązania:
https://bibliotekanauki.pl/articles/1031782.pdf
Data publikacji:
2020
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Copper
Copper nano particles
Cu
Diffraction
Green synthesis
Ocimum sanctum
Pepper
Piper nigrum
Tulsi
Opis:
Synthesis of nanoparticles using plant leaf extract is an eco-friendly, non-toxic and cost efficient approach in the field of nanotechnology. In this study, biosynthesis of stable copper nanoparticles were prepared by using Ocimum sanctum and Piper nigrum extract. These biosynthesized Cu nanoparticles were characterized with the help of X-Ray diffraction (XRD), Scanning Electron Microscopy (SEM) and Fourier transforms infrared spectroscopy (FTIR). The crystalline size of the Copper Nanoparticles prepared from Tulsi extract is little smaller than Copper nanoparticles prepared from Pepper extract. SEM images of Copper nanoparticles showed that the cluster formation, presence of smaller and larger grains. FTIR analysis revealed that the functional groups present in the Copper nanoparticles prepared from both Tulsi and Pepper extracts. Thus, this method can be used for rapid and ecofriendly biosynthesis of stable copper nanoparticles and can be used for catalytic agent, anti-microbial, anti-fungal, anti-biotic, nanosensor, super conducting material, solar cell applications.
Źródło:
World Scientific News; 2020, 150; 105-117
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synteza nanocząstek srebra przy użyciu ekstraktów roślinnych
Synthesis of silver nanoparticles using plant extracts
Autorzy:
Knurek, Jakub
Buchaj, Aleksandra
Garbacz, Monika
Powiązania:
https://bibliotekanauki.pl/articles/297726.pdf
Data publikacji:
2019
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
green synthesis
silver nanoparticles
nanotechnology
microbiology
antibacterial activity
zielona synteza
nanocząstki srebra
nanotechnologia
mikrobiologia
aktywność przeciwbakteryjna
Opis:
The field of nanotechnology is the most dynamic region of research in material sciences and the synthesis of nanoparticles is picking up significantly throughout the world. This trend is related to the possibilities of using them in many disciplines, including microbiology, biotechnology and laboratory diagnostics. Due to the high interest in nanoparticles synthesis, the methods of formation and stabilization of nanometric particles have become the subject of many studies in recent years. Medicinally active plants have proven to be the best reservoirs of diverse phytochemicals for the synthesis of biogenic silver nanoparticles. The resulting structures are characterized by optimal properties, and the method used is more ecological than chemical reduction. Accordingly, this review presents different methods of preparation silver nanoparticles and application of these nanoparticles in different fields.
Nanotechnologia jest jedną z najbardziej dynamicznych dyscyplin badań w dziedzinie inżynierii materiałowej, a liczba syntez nanocząstek metali znacząco rośnie na całym świecie. Ten trend związany jest z możliwościami wykorzystania ich w wielu dyscyplinach nauki, m.in. mikrobiologii, biotechnologii i diagnostyce laboratoryjnej. Ze względu na duże zainteresowanie nanocząstkami metody tworzenia i stabilizacji nanometrycznych cząstek stały się w ostatnich latach przedmiotem wielu badań. Udowodniono, że ekstrakty roślinne, zawierające zespół związków fitochemicznych, mogą być wykorzystywane do syntezy biogennych nanocząstek srebra. Powstałe struktury charakteryzują się stosownymi właściwościami, a metoda „zielonej” syntezy jest bardziej ekologiczna od innych technik. W związku z tym w artykule przedstawiono różne metody biosyntezy nanocząstek srebra oraz ich interdyscyplinarne zastosowania.
Źródło:
Inżynieria i Ochrona Środowiska; 2019, 22, 1; 63-74
1505-3695
2391-7253
Pojawia się w:
Inżynieria i Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Insect antifeedant potent unsaturated 1,3-oxazine-2-amines
Autorzy:
Thirunarayanan, G.
Renuka, V.
Sekar, K.G.
Lakshmanan, K.
Anbarasu, K.
Powiązania:
https://bibliotekanauki.pl/articles/412312.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Insect antifeedant activity
4th instar larvae Achoea Janata L
Aryl 1,3-oxazine
Castor leaf discs
Green synthesis
IR and NMR spectra
Opis:
Insect antifeedant activities of some halo substituted aryl 1,3-oxazine-2-amines have been measured using 4th instar larvae Achoea Janata L by castor leaf discs-Dethler’s method. The highly halo substituted oxazine amines have shown good insect antifeedant activities. The 1,3-oxazine amines have been synthesised by greener method by solvent-free cyclization of aryl enones with urea under microwave irradiation. The yields of the oxazines were more than 80 %. The synthesised oxazines were characterized by their physical constants, analytical and spectroscopic data.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 4; 66-81
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Occurrence, characterization and action of metal nanoparticles
Występowanie, charakterystyka i działanie nanocząstek metali
Autorzy:
Masarovičová, E.
Kráľová, K.
Powiązania:
https://bibliotekanauki.pl/articles/126623.pdf
Data publikacji:
2012
Wydawca:
Towarzystwo Chemii i Inżynierii Ekologicznej
Tematy:
behaviour
direct and indirect effects
green synthesis
living organisms
metal nanoparticles
plants
zachowania
skutki bezpośrednie i pośrednie
zielona synteza
organizmy żywe
nanocząstki metali
rośliny
Opis:
Metal nanoparticles (MNPs) are attracting attention for many technological applications as catalysts, in optical materials, medical treatments, sensors, and in energy storage and transmission. The function and use of these materials depend on their composition and structure. A practical route for synthesis of MNPs is by chemical procedure and by use of biological material (“green synthesis” as a dependable, environmentally benign process) including bacteria, algae and vascular plants (mainly metallophytes). Currently, there are various chemical and physical synthetic methods used for preparation of metal nanoparticles and several experimental techniques aimed at controlling the size and shape of MNPs. Toxic effects of MNPs on plants could be connected with chemical toxicity based on their chemical composition (eg release of toxic metal ions) and with stress or stimuli caused by the surface, size and shape of the particle. The physicochemical properties of nanoparticles determine their interaction with living organisms. In general, plant cells possess cell walls that constitute a primary site for interaction and a barrier for the entrance of nanoparticles. Inside cells, nanoparticles might directly provoke either alterations of membranes and other cell structures or activity of protective mechanisms. Indirect effects of MNP depend on their chemical and physical properties and may include physical restraints, solubilization of toxic nanoparticle compounds, or production of reactive oxygen species. However, it should be stressed that impact of MNPs on human and environmental health remains still unclear. Thus, evaluation scheme for national nanotechnology policies (that would be used to review the whole national nanotechnology plan) was recommended. The three following criteria for policy evaluation were suggested: appropriateness, efficiency and effectiveness.
Nanocząstki metali (MNPS) przyciągają uwagę ze względu na ich wykorzystanie w wielu zastosowaniach jako katalizatory, materiały optyczne, czujniki, w zabiegach medycznych, w przechowywaniu i transmisji energii. Funkcja i zastosowanie tych materiałów zależą od ich składu i struktury. Praktycznymi drogami syntezy MNPS są metody chemiczne i wykorzystanie materiałów biologicznych („zielona synteza” niezawodna, przyjazna środowisku), w tym bakterii, glonów i roślin naczyniowych (głównie metalofitów). Obecnie stosowane są różne fizyczne i chemiczne metody wytwarzania nanocząstek metali i kilka technik eksperymentalnych, mających na celu kontrolę wielkości i kształtu MNPS. Toksyczny wpływ MNPS na rośliny może być związany z toksycznością chemiczną ze względu na ich skład chemiczny (np. uwalnianie jonów metali) oraz stresem lub stymulacją spowodowanymi przez powierzchnię, wielkość i kształt cząstek. Interakcje z organizmami żywymi są określane przez fizykochemiczne właściwości nanocząstek. Ogólnie rzecz biorąc, ściany komórkowe roślin stanowią podstawowy element interakcji i barierę wejścia nanocząstek. Wewnątrz komórek nanocząstki mogą bezpośrednio wywoływać zarówno zmiany błon komórkowych, jak i innych struktur lub spowodować aktywizację mechanizmów ochronnych. Pośrednie skutki MNP zależą od ich właściwości chemicznych i fizycznych, mogących prowadzić do tworzenia pewnych ograniczeń fizycznych, rozpuszczania związków toksycznych czy wytwarzania reaktywnych form tlenu. Jednak należy podkreślić, że wpływ MNPS na zdrowie ludzi i stan środowiska jest nadal niejasny. Z tego względu konieczne jest stworzenie schematu systemu oceny polityki w dziedzinie nanotechnologii (które zostaną wykorzystane do przeglądu całości krajowego planu nanotechnologicznego). Zaproponowano trzy następujące kryteria oceny polityki: adekwatność, efektywność i skuteczność.
Źródło:
Proceedings of ECOpole; 2012, 6, 2; 445-449
1898-617X
2084-4557
Pojawia się w:
Proceedings of ECOpole
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polimery z pamięcią kształtu i ich otrzymywanie
Shape-memory polymers and their preparation
Autorzy:
Andrzejewski, Kewin
Czyżów, Wiktor
Jacewicz, Dagmara
Drzeżdżon, Joanna
Powiązania:
https://bibliotekanauki.pl/articles/2086740.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Chemiczne
Tematy:
polimery
synteza
katalizatory
zielona chemia
polymers
synthesis
catalysts
green chemistry
Opis:
SMP (shape-memory polymers) is an innovative class of programmable materials responsive to various stimuli. They are attracting increasing attention regarding possible new inventions, industrial use, and overall polymer research. After a brief introduction, this article examines the conventional shape-memory effect, methods of fabrication of shape memory polymers, and molecular and structural requirements for SMP to function. The shape memory behavior of such polymers is thoroughly presented, with the focus being on the thermo- and photo-induced SME. The uses in biomedical and industrial areas are also discussed.
Źródło:
Wiadomości Chemiczne; 2022, 76, 3-4; 183--205
0043-5104
2300-0295
Pojawia się w:
Wiadomości Chemiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
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