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Article: Efficient Route for the Preparation of Composite Resin Incorporating Silver Nanoparticles with Enhanced Antibacterial Properties.

Beery, Drake / Mottaleb, Mohammad Abdul / Meziani, Mohammed J / Campbell, James / Miranda, Isabella Pires / Bellamy, Michael

Nanomaterials (Basel, Switzerland)

2022 Volume 12, Issue 3

Abstract: An efficient and facile route for the immobilization of silver (Ag) nanoparticles (NPs) in anion exchange resin beads with different silver loading is proposed. In this method, ... ...

Abstract	An efficient and facile route for the immobilization of silver (Ag) nanoparticles (NPs) in anion exchange resin beads with different silver loading is proposed. In this method, BH
Language	English
Publishing date	2022-01-29
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2662255-5
ISSN	2079-4991
ISSN	2079-4991
DOI	10.3390/nano12030471
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Carbon Dots as Potent Antimicrobial Agents.

Dong, Xiuli / Liang, Weixiong / Meziani, Mohammed J / Sun, Ya-Ping / Yang, Liju

Theranostics

2020 Volume 10, Issue 2, Page(s) 671–686

Abstract: Carbon dots (CDots) have emerged to represent a highly promising new platform for visible/natural light-activated microbicidal agents. In this article, the syntheses, structures, and properties of CDots are highlighted, representative studies on their ... ...

Abstract	Carbon dots (CDots) have emerged to represent a highly promising new platform for visible/natural light-activated microbicidal agents. In this article, the syntheses, structures, and properties of CDots are highlighted, representative studies on their activities against bacteria, fungi, and viruses reviewed, and the related mechanistic insights discussed. Also highlighted and discussed are the excellent opportunities for potentially extremely broad applications of this new platform, including theranostics uses.
MeSH term(s)	Anti-Infective Agents/chemistry ; Anti-Infective Agents/pharmacology ; Bacteria/drug effects ; Bacteria/growth & development ; Carbon/chemistry ; Carbon/pharmacology ; Drug Resistance, Microbial ; Nanostructures/chemistry ; Quantum Dots/administration & dosage ; Quantum Dots/chemistry
Chemical Substances	Anti-Infective Agents ; Carbon (7440-44-0)
Language	English
Publishing date	2020-01-01
Publishing country	Australia
Document type	Journal Article ; Research Support, Non-U.S. Gov't ; Review
ZDB-ID	2592097-2
ISSN	1838-7640 ; 1838-7640
ISSN (online)	1838-7640
ISSN	1838-7640
DOI	10.7150/thno.39863
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Efficient Route for the Preparation of Composite Resin Incorporating Silver Nanoparticles with Enhanced Antibacterial Properties

Drake Beery / Mohammad Abdul Mottaleb / Mohammed J. Meziani / James Campbell / Isabella Pires Miranda / Michael Bellamy

Nanomaterials, Vol 12, Iss 471, p

2022 Volume 471

Abstract: An efficient and facile route for the immobilization of silver (Ag) nanoparticles (NPs) in anion exchange resin beads with different silver loading is proposed. In this method, BH 4 − ions were first introduced into chloride-form resin through an ion ... ...

Abstract	An efficient and facile route for the immobilization of silver (Ag) nanoparticles (NPs) in anion exchange resin beads with different silver loading is proposed. In this method, BH 4 − ions were first introduced into chloride-form resin through an ion exchange process with Cl − ions, followed by in-situ chemical reduction of Ag + ions at the surface of the resin to form metallic Ag nanoparticles. Morphology and structure of the resulting Ag-resin nanocomposites were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), Fourier transform infra-red (FTIR), inductively coupled plasma-optical emission spectrometry (ICP-OES), and thermogravimetry analysis (TGA). The results confirmed the presence of smaller diameter Ag NPs incorporated into the resin beads having an average diameter on the order of 10 nm with a few Ag NP clusters of 20–100 nm. The nanoparticles were homogeneously distributed throughout the resin. There were no dramatic increases in average particle sizes even at very high Ag loadings. The resin retained its structure and stability, allowing higher stability of immobilized AgNPs than the colloidal ones. The Ag-loaded resins made with 50 mM AgNO 3 were tested for antibacterial activity in vitro against Escherichia coli ( E. coli ) as a model microbial contaminant in water. Results showed greater than 99% bacterial inhibition within 3 h of exposure. The resin form offers greater ease of handling, long-term storage at room temperature, reusability in repeated reactions, and reduces the risk of environmental contamination.
Keywords	silver nanoparticles ; resin beads ; nanocomposites ; antibacterial properties ; Chemistry ; QD1-999
Subject code	540
Language	English
Publishing date	2022-01-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: On the myth of "red/near-IR carbon quantum dots" from thermal processing of specific colorless organic precursors.

Liang, Weixiong / Wang, Ping / Meziani, Mohammed J / Ge, Lin / Yang, Liju / Patel, Amankumar K / Morgan, Sabina O / Sun, Ya-Ping

Nanoscale advances

2021 Volume 3, Issue 14, Page(s) 4186–4195

Abstract: Carbon dots were originally found and reported as surface-passivated small carbon nanoparticles, where the effective surface passivation was the chemical functionalization of the carbon nanoparticles with organic molecules. Understandably, the very broad ...

Abstract	Carbon dots were originally found and reported as surface-passivated small carbon nanoparticles, where the effective surface passivation was the chemical functionalization of the carbon nanoparticles with organic molecules. Understandably, the very broad optical absorptions of carbon dots are largely the same as those intrinsic to the carbon nanoparticles, characterized by progressively decreasing absorptivities from shorter to longer wavelengths. Thus, carbon dots are generally weak absorbers in the red/near-IR and correspondingly weak emitters with low quantum yields. Much effort has been made on enhancing the optical performance of carbon dots in the red/near-IR, but without meaningful success due to the fact that optical absorptivities defined by Mother Nature are in general rather inert to any induced alterations. Nevertheless, there were shockingly casual claims in the literature on the major success in dramatically altering the optical absorption profiles of "carbon dots" by simply manipulating the dot synthesis to produce samples of some prominent optical absorption bands in the red/near-IR. Such claims have found warm receptions in the research field with a desperate need for carbon dots of the same optical performance in the red/near-IR as that in the green and blue. However, by looking closely at the initially reported synthesis and all its copies in subsequent investigations on the "red/near-IR carbon dots", one would find that the "success" of the synthesis by thermal or hydrothermal carbonization processing requires specific precursor mixtures of citric acid with formamide or urea. In the study reported here, the systematic investigation included precursor mixtures of citric acid with not only formamide or urea but also their partially methylated or permethylated derivatives for the carbonization processing under conditions similar to and beyond those commonly used and reported in the literature. Collectively all of the results are consistent only with the conclusion that the origins of the observed red/near-IR optical absorptions in samples from some of the precursor mixtures must be molecular chromophores from thermally induced chemical reactions, nothing to do with any nanoscale carbon entities produced by carbonization.
Language	English
Publishing date	2021-06-10
Publishing country	England
Document type	Journal Article
ISSN	2516-0230
ISSN (online)	2516-0230
DOI	10.1039/d1na00286d
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Dispersion of high-quality boron nitride nanosheets in polyethylene for nanocomposites of superior thermal transport properties.

Wang, Zhengdong / Priego, Paul / Meziani, Mohammed J / Wirth, Kathleen / Bhattacharya, Sriparna / Rao, Apparao / Wang, Ping / Sun, Ya-Ping

Nanoscale advances

2020 Volume 2, Issue 6, Page(s) 2507–2513

Abstract: High-quality boron nitride nanosheets (BNNs) characterized by large aspect ratios and less defective surfaces and structures are in demand for thermal management and other uses that exploit the uniquely advantageous properties of boron nitride, such as ... ...

Abstract	High-quality boron nitride nanosheets (BNNs) characterized by large aspect ratios and less defective surfaces and structures are in demand for thermal management and other uses that exploit the uniquely advantageous properties of boron nitride, such as being highly thermally conductive yet electrically insulating and extreme chemical and thermal stabilities. In this study, an ammonia-assisted exfoliation processing method was developed and applied to the preparation of high-quality BNNs. As a demonstration of the excellent potential of these nanomaterials, the BNNs were dispersed in polyethylene polymers for nanocomposite films of superior thermal transport performance at levels significantly beyond the state of the art in the literature. Effects of crosslinking in the nanocomposite film structure on thermal transport were also explored and favorable outcomes were achieved.
Language	English
Publishing date	2020-04-08
Publishing country	England
Document type	Journal Article
ISSN	2516-0230
ISSN (online)	2516-0230
DOI	10.1039/d0na00190b
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Theoretical Demonstration of the Interest of Using Porous Germanium to Fabricate Multilayer Vertical Optical Structures for the Detection of SF

Zegadi, Rami / Lorrain, Nathalie / Meziani, Sofiane / Dumeige, Yannick / Bodiou, Loїc / Guendouz, Mohammed / Zegadi, Abdelouahab / Charrier, Joël

Sensors (Basel, Switzerland)

2022 Volume 22, Issue 3

Abstract: Porous germanium is a promising material for sensing applications in the mid-infrared wavelength range due to its biocompatibility, large internal surface area, open pores network and widely tunable refractive index, as well as its large spectral ... ...

Abstract	Porous germanium is a promising material for sensing applications in the mid-infrared wavelength range due to its biocompatibility, large internal surface area, open pores network and widely tunable refractive index, as well as its large spectral transparency window ranging from 2 to 15 μm. Multilayers, such as Bragg reflectors and microcavities, based on porous germanium material, are designed and their optical spectra are simulated to enable SF
Language	English
Publishing date	2022-01-22
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2052857-7
ISSN	1424-8220 ; 1424-8220
ISSN (online)	1424-8220
ISSN	1424-8220
DOI	10.3390/s22030844
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Carbon dots

Wang, Ping / Meziani, Mohammed J / Fu, Yingqiang / Bunker, Christopher E / Hou, Xiaofang / Yang, Liju / Msellek, Hind / Zaharias, Melina / Darby, Jasmine P / Sun, Ya-Ping

Nanoscale advances

2021 Volume 3, Issue 8, Page(s) 2316–2324

Abstract: Carbon dots (CDots) are defined as surface-passivated small carbon nanoparticles, with the effective passivation generally achieved by organic functionalization. Photoexcited CDots are both potent electron donors and acceptors, and their characteristic ... ...

Abstract	Carbon dots (CDots) are defined as surface-passivated small carbon nanoparticles, with the effective passivation generally achieved by organic functionalization. Photoexcited CDots are both potent electron donors and acceptors, and their characteristic bright and colorful fluorescence emissions make them excellent fluorescence sensors for organic analytes and metal ions. For the latter extraordinarily low detection limits based on extremely efficient quenching of fluorescence intensities by the targeted metal cations have been observed and reported in the literature. However, all of the dot samples in those reported studies were made from "one-pot" carbonization of organic precursors mostly under rather mild processing conditions, unlikely to be sufficient for the required level of carbonization. Those dot samples should therefore be more appropriately considered as "nano-carbon/organic hybrids", characterized structurally as being highly porous and spongy, which must be playing a dominating role in the reported sensing results. In this study, we compared the dot samples from carbonization syntheses under similarly mild and also more aggressive processing conditions with the classically defined and structured CDots for the fluorescence sensing of copper(ii) cations in aqueous solutions. The observed dramatic decoupling between quenching results for fluorescence intensities and lifetimes of the carbonization samples, with the former being extraordinary and the latter within the diffusion controlled limit, suggested that the quenching of fluorescence intensities was greatly affected by the higher local quencher concentrations than the bulk associated with the porous and spongy sample structures, especially for the sample from carbonization under too mild processing conditions. The major differences between the classical CDots and the nano-carbon/organic hybrids are highlighted, and the tradeoffs between sensitivity and accuracy or reproducibility in the use of the latter for fluorescence sensing are discussed.
Language	English
Publishing date	2021-02-26
Publishing country	England
Document type	Journal Article
ISSN	2516-0230
ISSN (online)	2516-0230
DOI	10.1039/d1na00002k
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Advances in Studies of Boron Nitride Nanosheets and Nanocomposites for Thermal Transport and Related Applications.

Meziani, Mohammed J / Sheriff, Kirkland / Parajuli, Prakash / Priego, Paul / Bhattacharya, Sriparna / Rao, Apparao M / Quimby, Jesse L / Qiao, Rui / Wang, Ping / Hwu, Shiou-Jyh / Wang, Zhengdong / Sun, Ya-Ping

Chemphyschem : a European journal of chemical physics and physical chemistry

2021 Volume 23, Issue 1, Page(s) e202100645

Abstract: Hexagonal boron nitride (h-BN) and exfoliated nanosheets (BNNs) not only resemble their carbon counterparts graphite and graphene nanosheets in structural configurations and many excellent materials characteristics, especially the ultra-high thermal ... ...

Abstract	Hexagonal boron nitride (h-BN) and exfoliated nanosheets (BNNs) not only resemble their carbon counterparts graphite and graphene nanosheets in structural configurations and many excellent materials characteristics, especially the ultra-high thermal conductivity, but also offer other unique properties such as being electrically insulating and extreme chemical stability and oxidation resistance even at elevated temperatures. In fact, BNNs as a special class of 2-D nanomaterials have been widely pursued for technological applications that are beyond the reach of their carbon counterparts. Highlighted in this article are significant recent advances in the development of more effective and efficient exfoliation techniques for high-quality BNNs, the understanding of their characteristic properties, and the use of BNNs in polymeric nanocomposites for thermally conductive yet electrically insulating materials and systems. Major challenges and opportunities for further advances in the relevant research field are also discussed.
MeSH term(s)	Boron Compounds ; Graphite ; Nanocomposites ; Thermal Conductivity
Chemical Substances	Boron Compounds ; boron nitride (2U4T60A6YD) ; Graphite (7782-42-5)
Language	English
Publishing date	2021-11-05
Publishing country	Germany
Document type	Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S. ; Review
ZDB-ID	2025223-7
ISSN	1439-7641 ; 1439-4235
ISSN (online)	1439-7641
ISSN	1439-4235
DOI	10.1002/cphc.202100645
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Pharmaceuticals in grocery market fish fillets by gas chromatography-mass spectrometry.

Mottaleb, Musavvir Arafat / Stowe, Carly / Johnson, Daniel R / Meziani, Mohammed J / Mottaleb, M Abdul

Food chemistry

2016 Volume 190, Page(s) 529–536

Abstract: Occurrences of pharmaceuticals are evident in aquatic organisms. A reproducible gas chromatography-mass spectrometry (GC-MS) method using selected ion monitoring (SIM) has been used to determine the anti-histamine diphenhydramine (DPH), anti-anxiety ... ...

Abstract	Occurrences of pharmaceuticals are evident in aquatic organisms. A reproducible gas chromatography-mass spectrometry (GC-MS) method using selected ion monitoring (SIM) has been used to determine the anti-histamine diphenhydramine (DPH), anti-anxiety diazepam (DZP), anti-seizure carbamazepine (CZP) drugs and their metabolites in grocery stores fish that were homogenized, extracted, pre-concentrated, cleaned up, and examined. Identifications of the compounds in extracts were obtained by comparing similar mass spectral features and retention properties with standards. Among nine frequently detected drugs, only DPH and DZP were observed and ranged from 0.61 to 6.21 and 1.99 to 16.57 ng/g, respectively, in fourteen fish species. These concentration values were lower than the environmental fish. Mean spike recoveries of analytes exceeded 75% with relative standard deviations (RSD)<10%. The statistically-derived method detection limits (MDLs) for nine compounds ranged from 0.13 to 5.56 ng/g. Average surrogate recoveries were 80-85% with 4-9% RSD.
MeSH term(s)	Animals ; Fishes/metabolism ; Gas Chromatography-Mass Spectrometry/methods ; Pharmaceutical Solutions
Chemical Substances	Pharmaceutical Solutions
Language	English
Publishing date	2016-01-01
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	243123-3
ISSN	1873-7072 ; 0308-8146
ISSN (online)	1873-7072
ISSN	0308-8146
DOI	10.1016/j.foodchem.2015.06.003
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Article: Boron Nitride Nanosheets from Different Preparations and Correlations with Their Material Properties

Wang, Zhengdong / Meziani, Mohammed J / Patel, Amankumar K / Priego, Paul / Wirth, Kathleen / Wang, Ping / Sun, Ya-Ping

Industrial & engineering chemistry process design and development. 2019 Sept. 18, v. 58, no. 40

2019

Abstract: Boron nitride nanosheets (BNNs) are pursued for their high thermal conductivity yet electrical insulation and their extreme thermal and chemical stabilities for a variety of applications. For high-quality BNNs, a number of exfoliation approaches under ... ...

Abstract	Boron nitride nanosheets (BNNs) are pursued for their high thermal conductivity yet electrical insulation and their extreme thermal and chemical stabilities for a variety of applications. For high-quality BNNs, a number of exfoliation approaches under different processing conditions were evaluated. Three more effective methods were identified, including method-A based on refluxing and vigorous sonication in isopropyl alcohol, method-B involving ball-milling in urea, and method-C with the aid of ammonia in hydrothermal processing. These methods produced BNNs of apparently different structural and morphological characteristics, with those from the first two being smaller pieces, more defective, and their polymeric nanocomposites exhibiting relatively lower thermal conductive performance. The method-C yielded BNNs of obviously better quality, as also made evident by the observed high thermal diffusivities of their corresponding polymeric nanocomposites. Correlations of exfoliation approaches and conditions with characteristics of the produced BNNs and consequences to their various applications are discussed.
Keywords	ammonia ; boron nitride ; diffusivity ; hot water treatment ; insulating materials ; isopropyl alcohol ; nanosheets ; polymer nanocomposites ; process design ; sonication ; thermal conductivity ; urea
Language	English
Dates of publication	2019-0918
Size	p. 18644-18653.
Publishing place	American Chemical Society
Document type	Article
ZDB-ID	1484436-9
ISSN	1520-5045 ; 0888-5885
ISSN (online)	1520-5045
ISSN	0888-5885
DOI	10.1021/acs.iecr.9b03930
Database	NAL-Catalogue (AGRICOLA)

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