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Zhang M, Xu S, Zuo Z, Xu H, Xu Q, Li T, Zhang X, Wang L. Modulation of rice starch physicochemical properties and digestibility: The role of highland barley non-starch polysaccharide fractions. Int J Biol Macromol 2024; 279:135206. [PMID: 39244124 DOI: 10.1016/j.ijbiomac.2024.135206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2024] [Revised: 08/26/2024] [Accepted: 08/28/2024] [Indexed: 09/09/2024]
Abstract
Highland barley non-starch polysaccharides (HBNP), particularly β-glucans, are known for their health-promoting effects, including modulation of glycemic response and enhancement of gut health. This study investigated the impact of different HBNP fractions on the properties and digestibility of high-glycemic index rice starch. HBNP was segmented into five fractions (HBNP-15, HBNP-30, HBNP-45, HBNP-60, and HBNP-75) using gradient ethanol precipitation, and these fractions exhibited varying molecular weights, monosaccharide compositions, and β-glucan contents. All fractions reduced rice starch's pasting viscosity, with 1 % HBNP-75 leading to a 99.1 % decrease in final viscosity. Morphological and size distribution analyses showed that HBNP fractions limited granule swelling and disrupted starch's continuous phase structure. HBNPs also reduced starch digestibility and increased the formation of resistant starch from 10 % to 28 %. These results suggest potential uses for HBNP fractions in developing low-glycemic starch-based foods.
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Affiliation(s)
- Ming Zhang
- National Engineering Research Center of Cereal Fermentation and Food Biomanufacturing, Jiangnan University, Lihu Road 1800, Wuxi 214122, China; Jiangsu Provincial Engineering Research Center for Bioactive Product Processing, Jiangnan University, Lihu Road 1800, Wuxi 214122, China; School of Food Science and Technology, Jiangnan University, Lihu Road 1800, Wuxi 214122, China; Institute of Modern Agriculture, Jiangsu Provincial Agricultural Reclamation and Development Co., Ltd., Nanjing 211800, China
| | - Shunqian Xu
- National Engineering Research Center of Cereal Fermentation and Food Biomanufacturing, Jiangnan University, Lihu Road 1800, Wuxi 214122, China; Jiangsu Provincial Engineering Research Center for Bioactive Product Processing, Jiangnan University, Lihu Road 1800, Wuxi 214122, China; School of Food Science and Technology, Jiangnan University, Lihu Road 1800, Wuxi 214122, China
| | - Zhongyu Zuo
- National Engineering Research Center of Cereal Fermentation and Food Biomanufacturing, Jiangnan University, Lihu Road 1800, Wuxi 214122, China; Jiangsu Provincial Engineering Research Center for Bioactive Product Processing, Jiangnan University, Lihu Road 1800, Wuxi 214122, China; School of Food Science and Technology, Jiangnan University, Lihu Road 1800, Wuxi 214122, China
| | - Hui Xu
- National Engineering Research Center of Cereal Fermentation and Food Biomanufacturing, Jiangnan University, Lihu Road 1800, Wuxi 214122, China; Jiangsu Provincial Engineering Research Center for Bioactive Product Processing, Jiangnan University, Lihu Road 1800, Wuxi 214122, China; School of Food Science and Technology, Jiangnan University, Lihu Road 1800, Wuxi 214122, China
| | - Qianqian Xu
- National Engineering Research Center of Cereal Fermentation and Food Biomanufacturing, Jiangnan University, Lihu Road 1800, Wuxi 214122, China; Jiangsu Provincial Engineering Research Center for Bioactive Product Processing, Jiangnan University, Lihu Road 1800, Wuxi 214122, China; School of Food Science and Technology, Jiangnan University, Lihu Road 1800, Wuxi 214122, China
| | - Ting Li
- National Engineering Research Center of Cereal Fermentation and Food Biomanufacturing, Jiangnan University, Lihu Road 1800, Wuxi 214122, China; Jiangsu Provincial Engineering Research Center for Bioactive Product Processing, Jiangnan University, Lihu Road 1800, Wuxi 214122, China; School of Food Science and Technology, Jiangnan University, Lihu Road 1800, Wuxi 214122, China
| | - Xinxia Zhang
- National Engineering Research Center of Cereal Fermentation and Food Biomanufacturing, Jiangnan University, Lihu Road 1800, Wuxi 214122, China; Jiangsu Provincial Engineering Research Center for Bioactive Product Processing, Jiangnan University, Lihu Road 1800, Wuxi 214122, China; School of Food Science and Technology, Jiangnan University, Lihu Road 1800, Wuxi 214122, China
| | - Li Wang
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, Jiangnan University, Lihu Road 1800, Wuxi 214122, China; National Engineering Research Center of Cereal Fermentation and Food Biomanufacturing, Jiangnan University, Lihu Road 1800, Wuxi 214122, China; Jiangsu Provincial Engineering Research Center for Bioactive Product Processing, Jiangnan University, Lihu Road 1800, Wuxi 214122, China; School of Food Science and Technology, Jiangnan University, Lihu Road 1800, Wuxi 214122, China.
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2
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Sentis MPL, Lemahieu G, Hemsley E, Bouzaid M, Brambilla G. Size distribution of migrating particles and droplets under gravity in concentrated dispersions measured with static multiple light scattering. J Colloid Interface Sci 2024; 653:1358-1368. [PMID: 37801846 DOI: 10.1016/j.jcis.2023.09.163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2023] [Revised: 09/21/2023] [Accepted: 09/27/2023] [Indexed: 10/08/2023]
Abstract
HYPOTHESIS Light scattering techniques can provide a non-intrusive measurement of particle and droplet size distribution but are limited to relatively diluted liquid dispersions. Measurement of particle velocity distributions (PVD) and particle/droplet size distributions (PSD) in diluted to highly concentrated solid suspensions and emulsions can be performed by coupling the static multiple light scattering technique (SMLS) to mathematical models describing the vertical motion under gravity of polydisperse particles and droplets. EXPERIMENTS Measurement of the PSD using SMLS was performed on silica particles dispersed in water with monomodal, bimodal and trimodal PSDs ranging from 570 nm and 7.90 µm. Quasi-monodisperse certified latex particles with 815 nm mean diameter dispersed in water and non-controlled emulsions of hexadecane-water emulsions at volume fractions ranging from 0.005 % to 20 % were also characterized with SMLS. These measurements were compared to certified size distributions, and to laser diffraction and dynamic light scattering measurements. FINDINGS Robust, highly resolutive and concentration-dependent measurement of the PVD and PSD of solid particles and droplets was achieved for diluted to highly concentrated liquid dispersions. As interactions between particles or droplets are dependent on the dispersed phase concentration, accurate characterization of as-formulated industrial liquid dispersions can be performed with SMLS.
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3
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Fang Z, Sallach JB, Hodson ME. Ethanol, not water, should be used as the dispersant when measuring microplastic particle size distribution by laser diffraction. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 902:166129. [PMID: 37562611 DOI: 10.1016/j.scitotenv.2023.166129] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Revised: 07/21/2023] [Accepted: 08/06/2023] [Indexed: 08/12/2023]
Abstract
Size distribution is a crucial characteristic of microplastics (MPs). A typical method for measuring this property is wet laser diffraction. However, when measuring size distributions of MPs, despite it being a poor dispersant for many MPs, water is commonly selected, potentially limiting the reliability of reported measurements. To evaluate dispersant suitability, different aqueous concentrations of ethanol (0, 10, 20, 30, 40, 50, 75, 100 wt%) and aqueous solutions of 0.001 wt% Triton X-100 and a mixture comprising 10 wt% sodium pyrophosphate and 10 wt% methanol were used as dispersants in a laser granulometer (Mastersizer 2000) to determine particle size distributions (PSDs) of granular polyethylene MP35, MP125 and MP500 particles (nominally <35, <125 and, < 500 μm in size). The reliability of the PSDs depended on the dispersant used and size of primary MPs. With increasing ethanol concentrations, PSD curves of MP35 particles shifted from multi-modal to mono-modal distributions. The measured size distribution reduced from 1588.7 to 4.5 μm in water to 39.9 to 0.1 μm in 100 wt% ethanol. Generally, as ethanol concentration increased, uncertainty associated with the PSD parameters decreased. Although Triton X-100 and the mixed solution also showed better dispersion than water, measured particle sizes and coefficient of variation (COV, %) were notably larger than those for 100 wt% ethanol. Similar trends were observed for larger-sized MP125 and MP500 particles, but differences in PSD curves, PSD parameters, and COV (%) among dispersants were less pronounced. In all dispersants, the volume weighted mean diameters (VWMD) in 100 wt% ethanol (MP35: 14.1 μm, MP125: 102.5 μm, MP500: 300.0 μm) were smallest and close to diameters determined from microscope observations (MP35: 14.6 μm, MP125: 109.0 μm, MP500: 310.6 μm). Therefore, for accurate determinations of the PSDs of MP by wet laser diffraction, ethanol rather than water should be used as the dispersant.
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Affiliation(s)
- Z Fang
- Department of Environment and Geography, University of York, York YO10 5NG, United Kingdom.
| | - J B Sallach
- Department of Environment and Geography, University of York, York YO10 5NG, United Kingdom
| | - M E Hodson
- Department of Environment and Geography, University of York, York YO10 5NG, United Kingdom
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More S, Bampidis V, Benford D, Bragard C, Halldorsson T, Hernández‐Jerez A, Hougaard Bennekou S, Koutsoumanis K, Lambré C, Machera K, Naegeli H, Nielsen S, Schlatter J, Schrenk D, Silano (deceased) V, Turck D, Younes M, Castenmiller J, Chaudhry Q, Cubadda F, Franz R, Gott D, Mast J, Mortensen A, Oomen AG, Weigel S, Barthelemy E, Rincon A, Tarazona J, Schoonjans R. Guidance on risk assessment of nanomaterials to be applied in the food and feed chain: human and animal health. EFSA J 2021; 19:e06768. [PMID: 34377190 PMCID: PMC8331059 DOI: 10.2903/j.efsa.2021.6768] [Citation(s) in RCA: 67] [Impact Index Per Article: 22.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/30/2021] [Indexed: 02/08/2023] Open
Abstract
The EFSA has updated the Guidance on risk assessment of the application of nanoscience and nanotechnologies in the food and feed chain, human and animal health. It covers the application areas within EFSA's remit, including novel foods, food contact materials, food/feed additives and pesticides. The updated guidance, now Scientific Committee Guidance on nano risk assessment (SC Guidance on Nano-RA), has taken account of relevant scientific studies that provide insights to physico-chemical properties, exposure assessment and hazard characterisation of nanomaterials and areas of applicability. Together with the accompanying Guidance on Technical requirements for regulated food and feed product applications to establish the presence of small particles including nanoparticles (Guidance on Particle-TR), the SC Guidance on Nano-RA specifically elaborates on physico-chemical characterisation, key parameters that should be measured, methods and techniques that can be used for characterisation of nanomaterials and their determination in complex matrices. The SC Guidance on Nano-RA also details aspects relating to exposure assessment and hazard identification and characterisation. In particular, nanospecific considerations relating to in vitro/in vivo toxicological studies are discussed and a tiered framework for toxicological testing is outlined. Furthermore, in vitro degradation, toxicokinetics, genotoxicity, local and systemic toxicity as well as general issues relating to testing of nanomaterials are described. Depending on the initial tier results, additional studies may be needed to investigate reproductive and developmental toxicity, chronic toxicity and carcinogenicity, immunotoxicity and allergenicity, neurotoxicity, effects on gut microbiome and endocrine activity. The possible use of read-across to fill data gaps as well as the potential use of integrated testing strategies and the knowledge of modes or mechanisms of action are also discussed. The Guidance proposes approaches to risk characterisation and uncertainty analysis.
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5
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Barone G, O'Regan J, Kelly AL, O'Mahony JA. Physicochemical and bulk handling properties of micronised calcium salts and their application in calcium fortification of whey protein-based solutions. J FOOD ENG 2021. [DOI: 10.1016/j.jfoodeng.2020.110213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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6
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Jaeggi A, Rajagopalan AK, Morari M, Mazzotti M. Characterizing Ensembles of Platelike Particles via Machine Learning. Ind Eng Chem Res 2020. [DOI: 10.1021/acs.iecr.0c04662] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Anna Jaeggi
- Institute of Energy and Process Engineering, ETH Zurich, 8092 Zurich, Switzerland
| | | | - Manfred Morari
- Department of Electrical and Systems Engineering, University of Pennsylvania, Philadelphia 19104, United States
| | - Marco Mazzotti
- Institute of Energy and Process Engineering, ETH Zurich, 8092 Zurich, Switzerland
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Ferreira C, Cardona J, Agimelen O, Tachtatzis C, Andonovic I, Sefcik J, Chen YC. Quantification of particle size and concentration using in-line techniques and multivariate analysis. POWDER TECHNOL 2020. [DOI: 10.1016/j.powtec.2020.08.015] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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8
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Yang Y, Liao S, Luo Z, Qi R, Mac Fhionnlaoich N, Stellacci F, Guldin S. Comparative characterisation of non-monodisperse gold nanoparticle populations by X-ray scattering and electron microscopy. NANOSCALE 2020; 12:12007-12013. [PMID: 32463396 DOI: 10.1039/c9nr09481d] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Accurate nanoparticle size determination is essential across various research domains, with many functionalities in nanoscience and biomedical research being size-dependent. Although electron microscopy is capable of resolving a single particle down to the sub-nm scale, the reliable representation of entire populations is plagued by challenges in providing statistical significance, suboptimal preparation procedures and operator bias. While alternative techniques exist that provide ensemble information in solution, their implementation is generally challenging for non-monodisperse populations. Herein, we explore the use of small-angle X-ray scattering in combination with form-free Monte Carlo fitting of scattering profiles as an alternative to conventional electron microscopy imaging in providing access to any type of core size distribution. We report on a cross-method comparison for quasi-monodisperse, polydisperse and bimodal gold nanoparticles of 2-7 nm in diameter and discuss advantages and limitations of both techniques.
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Affiliation(s)
- Ye Yang
- Department of Chemical Engineering, University College London, Torrington Place, London, WC1E 7JE, UK.
| | - Suiyang Liao
- Institute of Materials, École Polytechnique Fédérale de Lausanne (EPFL), Station 12, 1015 Lausanne, Switzerland
| | - Zhi Luo
- Institute of Materials, École Polytechnique Fédérale de Lausanne (EPFL), Station 12, 1015 Lausanne, Switzerland
| | - Runzhang Qi
- Department of Chemical Engineering, University College London, Torrington Place, London, WC1E 7JE, UK.
| | - Niamh Mac Fhionnlaoich
- Department of Chemical Engineering, University College London, Torrington Place, London, WC1E 7JE, UK.
| | - Francesco Stellacci
- Institute of Materials, École Polytechnique Fédérale de Lausanne (EPFL), Station 12, 1015 Lausanne, Switzerland and Interfaculty Bioengineering Institute, École Polytechnique Fédérale de Lausanne (EPFL), Station 12, 1015 Lausanne, Switzerland
| | - Stefan Guldin
- Department of Chemical Engineering, University College London, Torrington Place, London, WC1E 7JE, UK.
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9
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Ivancic T, Lu C, Sheppard R, Thompson MR, Pawlak JL, Cheng CM, Lawton DJW. Investigating the Synergistic Anionic/Nonionic Surfactant Interaction on Nanoparticle Synthesis with Solvent-Free Extrusion Emulsification. Ind Eng Chem Res 2020. [DOI: 10.1021/acs.iecr.0c00550] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- T. Ivancic
- Department of Chemical Engineering, McMaster University, Hamilton, Ontario L8S 4L7, Canada
| | - C. Lu
- Xerox Corporation, Rochester, New York 14605, United States
| | - R. Sheppard
- Xerox Corporation, Rochester, New York 14605, United States
| | - M. R. Thompson
- Department of Chemical Engineering, McMaster University, Hamilton, Ontario L8S 4L7, Canada
| | - J. L. Pawlak
- Xerox Corporation, Rochester, New York 14605, United States
| | - C.-M. Cheng
- Xerox Corporation, Rochester, New York 14605, United States
| | - D. J. W. Lawton
- Xerox Research Center of Canada, Mississauga, Ontario L5K 2L1, Canada
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10
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Postelmans A, Aernouts B, Saeys W. Estimation of Particle Size Distribution from Bulk Scattering Spectra: Validation on Monomodal Suspensions. Anal Chem 2019; 91:10040-10048. [PMID: 31318541 DOI: 10.1021/acs.analchem.9b01913] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A particle size distribution (PSD) estimation method based on light-scattering properties was validated on experimental visible/near-infrared scattering spectra of polystyrene suspensions, with a nominal particle size ranging from 0.1 to 12 μm in diameter. On the basis of μs and g spectra extracted from double integrating sphere measurements, good PSD estimates were obtained for particles ≥1 μm. The particle volume fraction estimates in the case of μs were close to the target concentrations, although influenced by small baseline fluctuations on the spectra. For submicrometer particles, on the other hand, the non-oscillating μs spectra lack discriminating power, resulting in erroneous PSD estimates. The reduced scattering coefficient spectra (μs') were found less useful for particle size estimation as they lack a characteristic shape, causing an over- or underestimation of the distribution width. In summary, the estimation routine proved to deliver PSD estimates in line with the reference measurements for micrometer-sized or larger particles based on their μs and g scattering spectra. Additional validation on more polydisperse samples forms the next step before going to bimodal PSD estimates.
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Affiliation(s)
- Annelies Postelmans
- Department of Biosystems , MeBioS, KU Leuven , Kasteelpark Arenberg 30 , 3001 Leuven , Belgium
| | - Ben Aernouts
- Department of Biosystems , MeBioS, KU Leuven , Kasteelpark Arenberg 30 , 3001 Leuven , Belgium.,Department of Biosystems, Biosystems Technology Cluster , KU Leuven Campus Geel , Kleinhoefstraat 4 , 2440 Geel , Belgium
| | - Wouter Saeys
- Department of Biosystems , MeBioS, KU Leuven , Kasteelpark Arenberg 30 , 3001 Leuven , Belgium
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11
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Fato TP, Li DW, Zhao LJ, Qiu K, Long YT. Simultaneous Removal of Multiple Heavy Metal Ions from River Water Using Ultrafine Mesoporous Magnetite Nanoparticles. ACS OMEGA 2019; 4:7543-7549. [PMID: 31459847 PMCID: PMC6648574 DOI: 10.1021/acsomega.9b00731] [Citation(s) in RCA: 56] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2019] [Accepted: 04/16/2019] [Indexed: 05/17/2023]
Abstract
The exploration of simultaneous removal of co-existing or multiple pollutants from water by the means of nanomaterials paves a new avenue that is free from secondary pollution and inexpensive. In the aquatic environment, river water contains a mixture of ions, which can influence the adsorption process. In this respect, removing heavy metal ions becomes a true challenge. Here, four heavy metal ions, namely, Pb2+, Cd2+, Cu2+, and Ni2+, have been successfully removed simultaneously from river water using ultrafine mesoporous magnetite (Fe3O4) nanoparticles (UFMNPs) based on the affinity of these metal ions toward the UFMNP surfaces as well as their unique mesoporous structure, promoting the easy adsorption. The individual removal efficiencies of Pb2+, Cd2+, Cu2+, and Ni2+ ions from river water were 98, 87, 90, and 78%, respectively, whereas the removal efficiencies of the mixed Pb2+, Cd2+, Cu2+, and Ni2+ ions were 86, 80, 84, and 54%, respectively, in the same river water. Thus, the data clearly indicate the complex removal of heavy metal ions in multi-ion systems. This study has demonstrated the huge potential of UFMNPs to be effective for their use in wastewater treatment, especially to simultaneously remove multiple heavy metal ions from aqueous media.
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Affiliation(s)
- Tano Patrice Fato
- School
of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Da-Wei Li
- School
of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Li-Jun Zhao
- School
of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Kaipei Qiu
- School
of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
- E-mail: . Tel/Fax: 86-21-64252339
| | - Yi-Tao Long
- School
of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
- State
Key Laboratory of Analytical Chemistry for Life Science, School of
Chemistry and Chemical Engineering, Nanjing
University, 163 Xianlin
Avenue, Nanjing 210039, China
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12
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Supported Mn catalysts and the role of different supports in the catalytic oxidation of carbon monoxide. Chem Eng Sci 2019. [DOI: 10.1016/j.ces.2018.12.006] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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13
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Plant-Mediated Green Synthesis of Nanostructures: Mechanisms, Characterization, and Applications. INTERFACE SCIENCE AND TECHNOLOGY 2019. [DOI: 10.1016/b978-0-12-813586-0.00006-7] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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14
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Mostovshchikov A, Ilyin A, Egorov I. Effect of electron beam irradiation on the thermal properties of the aluminum nanopowder. Radiat Phys Chem Oxf Engl 1993 2018. [DOI: 10.1016/j.radphyschem.2018.09.024] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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15
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Milošević I, Rtimi S, Jayaprakash A, van Driel B, Greenwood B, Aimable A, Senna M, Bowen P. Synthesis and characterization of fluorinated anatase nanoparticles and subsequent N-doping for efficient visible light activated photocatalysis. Colloids Surf B Biointerfaces 2018; 171:445-450. [DOI: 10.1016/j.colsurfb.2018.07.035] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2018] [Revised: 06/22/2018] [Accepted: 07/16/2018] [Indexed: 10/28/2022]
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16
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Standard characterisation method for the granulometric state of intensely dispersed pigments and fillers based on an interlaboratory performance study. POWDER TECHNOL 2018. [DOI: 10.1016/j.powtec.2018.07.052] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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17
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Hardy A, Benford D, Halldorsson T, Jeger MJ, Knutsen HK, More S, Naegeli H, Noteborn H, Ockleford C, Ricci A, Rychen G, Schlatter JR, Silano V, Solecki R, Turck D, Younes M, Chaudhry Q, Cubadda F, Gott D, Oomen A, Weigel S, Karamitrou M, Schoonjans R, Mortensen A. Guidance on risk assessment of the application of nanoscience and nanotechnologies in the food and feed chain: Part 1, human and animal health. EFSA J 2018; 16:e05327. [PMID: 32625968 PMCID: PMC7009542 DOI: 10.2903/j.efsa.2018.5327] [Citation(s) in RCA: 114] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
The European Food Safety Authority has produced this Guidance on human and animal health aspects (Part 1) of the risk assessment of nanoscience and nanotechnology applications in the food and feed chain. It covers the application areas within EFSA's remit, e.g. novel foods, food contact materials, food/feed additives and pesticides. The Guidance takes account of the new developments that have taken place since publication of the previous Guidance in 2011. Potential future developments are suggested in the scientific literature for nanoencapsulated delivery systems and nanocomposites in applications such as novel foods, food/feed additives, biocides, pesticides and food contact materials. Therefore, the Guidance has taken account of relevant new scientific studies that provide more insights to physicochemical properties, exposure assessment and hazard characterisation of nanomaterials. It specifically elaborates on physicochemical characterisation of nanomaterials in terms of how to establish whether a material is a nanomaterial, the key parameters that should be measured, the methods and techniques that can be used for characterisation of nanomaterials and their determination in complex matrices. It also details the aspects relating to exposure assessment and hazard identification and characterisation. In particular, nanospecific considerations relating to in vivo/in vitro toxicological studies are discussed and a tiered framework for toxicological testing is outlined. It describes in vitro degradation, toxicokinetics, genotoxicity as well as general issues relating to testing of nanomaterials. Depending on the initial tier results, studies may be needed to investigate reproductive and developmental toxicity, immunotoxicity, allergenicity, neurotoxicity, effects on gut microbiome and endocrine activity. The possible use of read‐across to fill data gaps as well as the potential use of integrated testing strategies and the knowledge of modes/mechanisms of action are also discussed. The Guidance proposes approaches to risk characterisation and uncertainty analysis, and provides recommendations for further research in this area. This publication is linked to the following EFSA Supporting Publications article: http://onlinelibrary.wiley.com/doi/10.2903/sp.efsa.2018.EN-1430/full
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Kotzur BA, Berry RJ, Zigan S, García-Triñanes P, Bradley MS. Particle attrition mechanisms, their characterisation, and application to horizontal lean phase pneumatic conveying systems: A review. POWDER TECHNOL 2018. [DOI: 10.1016/j.powtec.2018.04.047] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Modlitbová P, Klepárník K, Farka Z, Pořízka P, Skládal P, Novotný K, Kaiser J. Time-Dependent Growth of Silica Shells on CdTe Quantum Dots. NANOMATERIALS 2018; 8:nano8060439. [PMID: 29914152 PMCID: PMC6027165 DOI: 10.3390/nano8060439] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/24/2018] [Revised: 06/11/2018] [Accepted: 06/14/2018] [Indexed: 11/16/2022]
Abstract
The purpose of this study is to investigate the time dependent growth of silica shells on CdTe quantum dots to get their optimum thicknesses for practical applications. The core/shell structured silica-coated CdTe quantum dots (CdTe/SiO2 QDs) were synthesized by the Ströber process, which used CdTe QDs co-stabilized by mercaptopropionic acid. The coating procedure used silane primer (3-mercaptopropyltrimethoxysilane) in order to make the quantum dots (QDs) surface vitreophilic. The total size of QDs was dependent on both the time of silica shell growth in the presence of sodium silicate, and on the presence of ethanol during this growth. The size of particles was monitored during the first 72 h using two principally different methods: Dynamic Light Scattering (DLS), and Scanning Electron Microscopy (SEM). The data obtained by both methods were compared and reasons for differences discussed. Without ethanol precipitation, the silica shell thickness grew slowly and increased the nanoparticle total size from approximately 23 nm up to almost 30 nm (DLS data), and up to almost 60 nm (SEM data) in three days. During the same time period but in the presence of ethanol, the size of CdTe/SiO2 QDs increased more significantly: up to 115 nm (DLS data) and up to 83 nm (SEM data). The variances occurring between silica shell thicknesses caused by different methods of silica growth, as well as by different evaluation methods, were discussed.
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Affiliation(s)
- Pavlína Modlitbová
- Central European Institute of Technology (CEITEC) Brno University of Technology, Technická 3058/10, 61600 Brno, Czech Republic.
| | - Karel Klepárník
- Institute of Analytical Chemistry, Academy of Sciences of the Czech Republic, Veveří 97, 60200 Brno, Czech Republic.
| | - Zdeněk Farka
- Central European Institute of Technology (CEITEC) Masaryk University, Kamenice 5, 62500 Brno, Czech Republic.
| | - Pavel Pořízka
- Central European Institute of Technology (CEITEC) Brno University of Technology, Technická 3058/10, 61600 Brno, Czech Republic.
| | - Petr Skládal
- Central European Institute of Technology (CEITEC) Masaryk University, Kamenice 5, 62500 Brno, Czech Republic.
| | - Karel Novotný
- Central European Institute of Technology (CEITEC) Masaryk University, Kamenice 5, 62500 Brno, Czech Republic.
| | - Jozef Kaiser
- Central European Institute of Technology (CEITEC) Brno University of Technology, Technická 3058/10, 61600 Brno, Czech Republic.
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Eco-compatible synthesis of novel 3-hydroxyflavones catalyzed by KF-impregnated mesoporous natural zeolite clinoptilolite. Chem Heterocycl Compd (N Y) 2018. [DOI: 10.1007/s10593-018-2297-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Ali S, Farrukh MA. Effect of Calcination Temperature on the Structural, Thermodynamic, and Optical Properties of MoO3
Nanoparticles. J CHIN CHEM SOC-TAIP 2017. [DOI: 10.1002/jccs.201700163] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Shaista Ali
- Nano-Chemistry Laboratory, Department of Chemistry; GC University Lahore; Lahore 54000 Pakistan
| | - Muhammad Akhyar Farrukh
- Nano-Chemistry Laboratory, Department of Chemistry; GC University Lahore; Lahore 54000 Pakistan
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23
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Encapsulation of ginger ethanolic extract in nanoliposome and evaluation of its antioxidant activity on sunflower oil. CHEMICAL PAPERS 2017. [DOI: 10.1007/s11696-017-0164-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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24
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Kuśnieruk S, Wojnarowicz J, Chodara A, Chudoba T, Gierlotka S, Lojkowski W. Influence of hydrothermal synthesis parameters on the properties of hydroxyapatite nanoparticles. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2016; 7:1586-1601. [PMID: 28144510 PMCID: PMC5238695 DOI: 10.3762/bjnano.7.153] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2016] [Accepted: 10/13/2016] [Indexed: 05/26/2023]
Abstract
Hydroxyapatite (HAp) nanoparticles of tunable diameter were obtained by the precipitation method at room temperature and by microwave hydrothermal synthesis (MHS). The following parameters of the obtained nanostructured HAp were determined: pycnometric density, specific surface area, phase purity, lattice parameters, particle size, particle size distribution, water content, and structure. HAp nanoparticle morphology and structure were determined using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). X-ray diffraction measurements confirmed crystalline HAp was synthesized, which was pure in terms of phase. It was shown that by changing the synthesis parameters, the diameter of HAp nanoparticles could be controlled. The average diameter of the HAp nanoparticles was determined by Scherrer's equation via the Nanopowder XRD Processor Demo web application, which interprets the results of specific surface area and TEM measurements using the dark-field technique. The obtained nanoparticles with average particle diameter ranging from 8-39 nm were characterized by having homogeneous morphology with a needle shape and a narrow particle size distribution. Strong similarities were found when comparing the properties of some types of nanostructured hydroxyapatite with natural occurring apatite found in animal bones and teeth.
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Affiliation(s)
- Sylwia Kuśnieruk
- Laboratory of Nanostructures, Institute of High Pressure Physics (UNIPRESS), Polish Academy of Sciences, Sokolowska Street 29/37, 01-142 Warsaw, Poland
| | - Jacek Wojnarowicz
- Laboratory of Nanostructures, Institute of High Pressure Physics (UNIPRESS), Polish Academy of Sciences, Sokolowska Street 29/37, 01-142 Warsaw, Poland
| | - Agnieszka Chodara
- Laboratory of Nanostructures, Institute of High Pressure Physics (UNIPRESS), Polish Academy of Sciences, Sokolowska Street 29/37, 01-142 Warsaw, Poland
| | - Tadeusz Chudoba
- Laboratory of Nanostructures, Institute of High Pressure Physics (UNIPRESS), Polish Academy of Sciences, Sokolowska Street 29/37, 01-142 Warsaw, Poland
| | - Stanislaw Gierlotka
- Laboratory of Nanostructures, Institute of High Pressure Physics (UNIPRESS), Polish Academy of Sciences, Sokolowska Street 29/37, 01-142 Warsaw, Poland
| | - Witold Lojkowski
- Laboratory of Nanostructures, Institute of High Pressure Physics (UNIPRESS), Polish Academy of Sciences, Sokolowska Street 29/37, 01-142 Warsaw, Poland
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Göhler D, Khosrawipour V, Khosrawipour T, Diaz-Carballo D, Falkenstein TA, Zieren J, Stintz M, Giger-Pabst U. Technical description of the microinjection pump (MIP ®) and granulometric characterization of the aerosol applied for pressurized intraperitoneal aerosol chemotherapy (PIPAC). Surg Endosc 2016; 31:1778-1784. [PMID: 27631320 DOI: 10.1007/s00464-016-5174-5] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2016] [Accepted: 08/06/2016] [Indexed: 10/21/2022]
Abstract
BACKGROUND Pressurized intraperitoneal aerosol chemotherapy (PIPAC) is gaining acceptance in clinical practice, but detailed information about the microinjection pump (MIP®), the generated aerosol and drug distribution is missing. ANALYTICAL METHODS Ex vivo granulometric analyses by means of laser diffraction spectrometry were performed for MIP® aerosol characterization. Beside the standard operation conditions, the impact of the volumetric liquid flow rate on the aerosol characteristics was investigated with different liquids. Granulometric results as well as the local drug distribution were verified by ex vivo gravimetric analyses. On the basis of determined MIP® characteristics, the aerosol droplet size, which is necessary for a homogenous intra-abdominal drug distribution, was calculated. RESULTS Granulometric analyses showed that the MIP® aerosol consists of a bimodal volume-weighted particle size distribution (PSD3) with a median droplet diameter of x 50,3 = 25 µm. Calculations reveal that the droplet size for a homogenous intra-abdominal drug distribution during PIPAC therapy should be below 1.2 µm. We show that >97.5 vol% of the aerosolized liquid is delivered as droplets with ≥3 µm in diameter, which are primarily deposited on the surface beneath the MIP® by gravitational settling and inertial impaction. These findings were confirmed by ex vivo gravimetric analyses, where more than 86.0 vol% of the aerosolized liquid was deposited within a circular area with a diameter of 15 cm. CONCLUSIONS The granulometric aerosol properties, as well as the aerodynamic conditions achieved by standard MIP® operation, do not support the idea of widespread or homogenous drug distribution in the abdominal cavity.
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Affiliation(s)
- Daniel Göhler
- Research Group Mechanical Process Engineering, Institute of Process Engineering and Environmental Technology, Technische Universität Dresden, Dresden, Germany
| | - Veria Khosrawipour
- Department of General Surgery and Therapy Center for Peritonealcarcinomatosis, St. Mary's Hospital Herne, Ruhr University Bochum, Hölkeskampring 40, 44625, Herne, Germany.,Basic Research Laboratory Department of Surgery, St. Mary's Hospital Herne, Ruhr University Bochum, Bochum, Germany
| | - Tanja Khosrawipour
- Basic Research Laboratory Department of Surgery, St. Mary's Hospital Herne, Ruhr University Bochum, Bochum, Germany
| | - David Diaz-Carballo
- Department of Hematology and Medical Oncology, St. Mary's Hospital Herne, Ruhr University Bochum, Bochum, Germany
| | - Thomas Albert Falkenstein
- Basic Research Laboratory Department of Surgery, St. Mary's Hospital Herne, Ruhr University Bochum, Bochum, Germany
| | - Jürgen Zieren
- Department of General Surgery and Therapy Center for Peritonealcarcinomatosis, St. Mary's Hospital Herne, Ruhr University Bochum, Hölkeskampring 40, 44625, Herne, Germany
| | - Michael Stintz
- Research Group Mechanical Process Engineering, Institute of Process Engineering and Environmental Technology, Technische Universität Dresden, Dresden, Germany
| | - Urs Giger-Pabst
- Department of General Surgery and Therapy Center for Peritonealcarcinomatosis, St. Mary's Hospital Herne, Ruhr University Bochum, Hölkeskampring 40, 44625, Herne, Germany. .,Basic Research Laboratory Department of Surgery, St. Mary's Hospital Herne, Ruhr University Bochum, Bochum, Germany.
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Dhakal S, Giusti MM, Balasubramaniam VM. Effect of high pressure processing on dispersive and aggregative properties of almond milk. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2016; 96:3821-3830. [PMID: 26679559 DOI: 10.1002/jsfa.7576] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2015] [Revised: 09/30/2015] [Accepted: 12/06/2015] [Indexed: 06/05/2023]
Abstract
BACKGROUND A study was conducted to investigate the impact of high pressure (450 and 600 MPa at 30 °C) and thermal (72, 85 and 99 °C at 0.1 MPa) treatments on dispersive and aggregative characteristics of almond milk. Experiments were conducted using a kinetic pressure testing unit and water bath. Particle size distribution, microstructure, UV absorption spectra, pH and color changes of processed and unprocessed samples were analyzed. RESULTS Raw almond milk represented the mono model particle size distribution with average particle diameters of 2 to 3 µm. Thermal or pressure treatment of almond milk shifted the particle size distribution towards right and increased particle size by five- to six-fold. Micrographs confirmed that both the treatments increased particle size due to aggregation of macromolecules. Pressure treatment produced relatively more and larger aggregates than those produced by heat treated samples. The apparent aggregation rate constant for 450 MPa and 600 MPa processed samples were k450MPa,30°C = 0.0058 s(-1) and k600MPa,30°C = 0.0095 s(-1) respectively. CONCLUSIONS This study showed that dispersive and aggregative properties of high pressure and heat-treated almond milk were different due to differences in protein denaturation, particles coagulation and aggregates morphological characteristics. Knowledge gained from the study will help food processors to formulate novel plant-based beverages treated with high pressure. © 2015 Society of Chemical Industry.
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Affiliation(s)
- Santosh Dhakal
- Department of Food Science & Technology, The Ohio State University, Columbus, OH, 43210, USA
| | - M Monica Giusti
- Department of Food Science & Technology, The Ohio State University, Columbus, OH, 43210, USA
| | - V M Balasubramaniam
- Department of Food Science & Technology, The Ohio State University, Columbus, OH, 43210, USA
- Department of Food Agricultural and Biological Engineering, The Ohio State University, Columbus, OH, 43210, USA
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Ashik U, Daud WW. Stabilization of Ni, Fe, and Co nanoparticles through modified Stöber method to obtain excellent catalytic performance: Preparation, characterization, and catalytic activity for methane decomposition. J Taiwan Inst Chem Eng 2016. [DOI: 10.1016/j.jtice.2015.12.019] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Soori M, Zarezadeh K, Sheibani S, Rashchi F. Mechano-chemical processing and characterization of nano-structured FeS powder. ADV POWDER TECHNOL 2016. [DOI: 10.1016/j.apt.2016.02.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Babick F, Mielke J, Wohlleben W, Weigel S, Hodoroaba VD. How reliably can a material be classified as a nanomaterial? Available particle-sizing techniques at work. JOURNAL OF NANOPARTICLE RESEARCH : AN INTERDISCIPLINARY FORUM FOR NANOSCALE SCIENCE AND TECHNOLOGY 2016; 18:158. [PMID: 27375365 PMCID: PMC4908171 DOI: 10.1007/s11051-016-3461-7] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2016] [Accepted: 05/25/2016] [Indexed: 05/05/2023]
Abstract
ABSTRACT Currently established and projected regulatory frameworks require the classification of materials (whether nano or non-nano) as specified by respective definitions, most of which are based on the size of the constituent particles. This brings up the question if currently available techniques for particle size determination are capable of reliably classifying materials that potentially fall under these definitions. In this study, a wide variety of characterisation techniques, including counting, fractionating, and spectroscopic techniques, has been applied to the same set of materials under harmonised conditions. The selected materials comprised well-defined quality control materials (spherical, monodisperse) as well as industrial materials of complex shapes and considerable polydispersity. As a result, each technique could be evaluated with respect to the determination of the number-weighted median size. Recommendations on the most appropriate and efficient use of techniques for different types of material are given.
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Affiliation(s)
- Frank Babick
- />Research Group of Mechanical Process Engineering, Institut für Verfahrenstechnik und Umwelttechnik, Technische Universität Dresden (TUD), 01062 Dresden, Germany
| | - Johannes Mielke
- />Division 6.8 Surface Analysis and Interfacial Chemistry, Bundesanstalt für Materialforschung und -prüfung (BAM), 12205 Berlin, Germany
| | - Wendel Wohlleben
- />Department of Material Physics, BASF SE, 67056 Ludwigshafen, Germany
| | - Stefan Weigel
- />RIKILT – Wageningen UR, 6700 AE Wageningen, The Netherlands
- />Bundesinstitut für Risikobewertung (BfR), 10589 Berlin, Germany
| | - Vasile-Dan Hodoroaba
- />Division 6.8 Surface Analysis and Interfacial Chemistry, Bundesanstalt für Materialforschung und -prüfung (BAM), 12205 Berlin, Germany
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Ohenoja K, Illikainen M. Effect of operational parameters and stress energies on stirred media milling of talc. POWDER TECHNOL 2015. [DOI: 10.1016/j.powtec.2015.05.036] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Dudkiewicz A, Boxall AB, Chaudhry Q, Mølhave K, Tiede K, Hofmann P, Linsinger TP. Uncertainties of size measurements in electron microscopy characterization of nanomaterials in foods. Food Chem 2015; 176:472-9. [DOI: 10.1016/j.foodchem.2014.12.071] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2014] [Revised: 12/16/2014] [Accepted: 12/17/2014] [Indexed: 11/26/2022]
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Case Study – Characterization of Nanomaterials in Food Products. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/b978-0-08-099948-7.00009-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/30/2023]
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Dudkiewicz A, Wagner S, Lehner A, Chaudhry Q, Pietravalle S, Tiede K, Boxall ABA, Allmaier G, Tiede D, Grombe R, von der Kammer F, Hofmann T, Mølhave K. A uniform measurement expression for cross method comparison of nanoparticle aggregate size distributions. Analyst 2015; 140:5257-67. [DOI: 10.1039/c5an00561b] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Measurement methods produce incomparable results when applied to aggregated nanoparticles.
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Affiliation(s)
- Agnieszka Dudkiewicz
- The Food and Environment Research Agency
- York Y041 1LZ
- UK
- The University of York
- York
| | - Stephan Wagner
- Department of Environmental Geosciences
- University of Vienna
- A-1090 Vienna
- Austria
| | - Angela Lehner
- Reasearch group Bio- and Polymer Analysis
- Institute of Chemical Technologies and Analytics
- Vienna University of Technology
- A-1060 Vienna
- Austria
| | | | | | - Karen Tiede
- The Food and Environment Research Agency
- York Y041 1LZ
- UK
| | | | - Guenter Allmaier
- Reasearch group Bio- and Polymer Analysis
- Institute of Chemical Technologies and Analytics
- Vienna University of Technology
- A-1060 Vienna
- Austria
| | - Dirk Tiede
- Department of Geoinformatics - Z_GIS
- University of Salzburg
- A-5020 Salzburg
- Austria
| | - Ringo Grombe
- Joint Research Centre
- Institute for Reference Materials and Measurements
- Geel 2440
- Belgium
| | | | - Thilo Hofmann
- Department of Environmental Geosciences
- University of Vienna
- A-1090 Vienna
- Austria
| | - Kristian Mølhave
- Deptartment of Micro and Nanotechnology
- Technical University of Denmark
- Denmark
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Ramírez-Ortega D, Meléndez AM, Acevedo-Peña P, González I, Arroyo R. Semiconducting properties of ZnO/TiO2 composites by electrochemical measurements and their relationship with photocatalytic activity. Electrochim Acta 2014. [DOI: 10.1016/j.electacta.2014.06.060] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Graczyk H, Bryan LC, Lewinski N, Suarez G, Coullerez G, Bowen P, Riediker M. Physicochemical characterization of nebulized superparamagnetic iron oxide nanoparticles (SPIONs). J Aerosol Med Pulm Drug Deliv 2014; 28:43-51. [PMID: 24801912 DOI: 10.1089/jamp.2013.1117] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND Aerosol-mediated delivery of nano-based therapeutics to the lung has emerged as a promising alternative for treatment and prevention of lung diseases. Superparamagnetic iron oxide nanoparticles (SPIONs) have attracted significant attention for such applications due to their biocompatibility and magnetic properties. However, information is lacking about the characteristics of nebulized SPIONs for use as a therapeutic aerosol. To address this need, we conducted a physicochemical characterization of nebulized Rienso, a SPION-based formulation for intravenous treatment of anemia. METHODS Four different concentrations of SPION suspensions were nebulized with a one-jet nebulizer. Particle size was measured in suspension by transmission electron microscopy (TEM), photon correlation spectroscopy (PCS), and nanoparticle tracking analysis (NTA), and in the aerosol by a scanning mobility particle sizer (SMPS). RESULTS The average particle size in suspension as measured by TEM, PCS, and NTA was 9±2 nm, 27±7 nm, and 56±10 nm, respectively. The particle size in suspension remained the same before and after the nebulization process. However, after aerosol collection in an impinger, the suspended particle size increased to 159±46 nm as measured by NTA. The aerosol particle concentration increased linearly with increasing suspension concentration, and the aerodynamic diameter remained relatively stable at around 75 nm as measured by SMPS. CONCLUSIONS We demonstrated that the total number and particle size in the aerosol were modulated as a function of the initial concentration in the nebulizer. The data obtained mark the first known independent characterization of nebulized Rienso and, as such, provide critical information on the behavior of Rienso nanoparticles in an aerosol. The data obtained in this study add new knowledge to the existing body of literature on potential applications of SPION suspensions as inhaled aerosol therapeutics.
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Affiliation(s)
- Halshka Graczyk
- 1 Institute for Work and Health, University of Lausanne and Geneva , 1066 Epalinges-Lausanne, Switzerland
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Van Roosbroeck R, Van Roy W, Stakenborg T, Trekker J, D'Hollander A, Dresselaers T, Himmelreich U, Lammertyn J, Lagae L. Synthetic antiferromagnetic nanoparticles as potential contrast agents in MRI. ACS NANO 2014; 8:2269-2278. [PMID: 24483137 DOI: 10.1021/nn406158h] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We present the top-down synthesis of a novel type of MRI T2 contrast agent with great control over size and shape using a colloidal lithography technique. The resulting synthetic antiferromagnetic nanoparticles (SAF-NPs) yield improved relaxivities compared to superparamagnetic iron oxide alternatives (SPIONs). For T2 weighted imaging, the outer sphere relaxation theory has shown that the sensitivity of a T2 contrast agent is dependent on the particle size with an optimal size that exceeds the superparamagnetic limit of SPIONs. With the use of the interlayer exchange coupling effect, the SAF-NPs presented here do not suffer from this limit. Adjusting the outer sphere relaxation theory for spherical particles to SAF-NPs, we show both theoretically and experimentally that the SAF-NP size can be optimized to reach the r2 maximum. With measured r2 values up to 355 s(-1) mM(-1), our SAF-NPs show better performance than commercial alternatives and are competitive with the state-of-the-art. This performance is confirmed in an in vitro MRI study on SKOV3 cells.
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Aguiló-Aguayo N, Maurizi L, Galmarini S, Ollivier-Beuzelin MG, Coullerez G, Bertran E, Hofmann H. Aqueous stabilisation of carbon-encapsulated superparamagnetic α-iron nanoparticles for biomedical applications. Dalton Trans 2014; 43:13764-75. [DOI: 10.1039/c4dt00085d] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Carbon-encapsulated superparamagnetic α-Fe nanoparticles were stabilised in aqueous media allowing their cell internalisation.
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Affiliation(s)
- Noemí Aguiló-Aguayo
- FEMAN Group
- IN2 UB
- Department of Applied Physics and Optics
- Universitat de Barcelona
- 08028 Barcelona, Spain
| | - Lionel Maurizi
- Laboratoire de Technologie de Poudres (LTP)
- EPFL-STI-IMX-LTP
- Lausanne, Switzerland
| | - Sandra Galmarini
- Laboratoire de Technologie de Poudres (LTP)
- EPFL-STI-IMX-LTP
- Lausanne, Switzerland
| | | | - Géraldine Coullerez
- Laboratoire de Technologie de Poudres (LTP)
- EPFL-STI-IMX-LTP
- Lausanne, Switzerland
| | - Enric Bertran
- FEMAN Group
- IN2 UB
- Department of Applied Physics and Optics
- Universitat de Barcelona
- 08028 Barcelona, Spain
| | - Heinrich Hofmann
- Laboratoire de Technologie de Poudres (LTP)
- EPFL-STI-IMX-LTP
- Lausanne, Switzerland
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Slotwinski JA, Garboczi EJ, Stutzman PE, Ferraris CF, Watson SS, Peltz MA. Characterization of Metal Powders Used for Additive Manufacturing. JOURNAL OF RESEARCH OF THE NATIONAL INSTITUTE OF STANDARDS AND TECHNOLOGY 2014; 119:460-93. [PMID: 26601040 PMCID: PMC4487284 DOI: 10.6028/jres.119.018] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 08/12/2014] [Indexed: 05/18/2023]
Abstract
Additive manufacturing (AM) techniques can produce complex, high-value metal parts, with potential applications as critical parts, such as those found in aerospace components. The production of AM parts with consistent and predictable properties requires input materials (e.g., metal powders) with known and repeatable characteristics, which in turn requires standardized measurement methods for powder properties. First, based on our previous work, we assess the applicability of current standardized methods for powder characterization for metal AM powders. Then we present the results of systematic studies carried out on two different powder materials used for additive manufacturing: stainless steel and cobalt-chrome. The characterization of these powders is important in NIST efforts to develop appropriate measurements and standards for additive materials and to document the property of powders used in a NIST-led additive manufacturing material round robin. An extensive array of characterization techniques was applied to these two powders, in both virgin and recycled states. The physical techniques included laser diffraction particle size analysis, X-ray computed tomography for size and shape analysis, and optical and scanning electron microscopy. Techniques sensitive to structure and chemistry, including X-ray diffraction, energy dispersive analytical X-ray analysis using the X-rays generated during scanning electron microscopy, and X-Ray photoelectron spectroscopy were also employed. The results of these analyses show how virgin powder changes after being exposed to and recycled from one or more Direct Metal Laser Sintering (DMLS) additive manufacturing build cycles. In addition, these findings can give insight into the actual additive manufacturing process.
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Surface modification of TiO2 nanoparticles with AHAPS aminosilane: distinction between physisorption and chemisorption. ADSORPTION 2013. [DOI: 10.1007/s10450-013-9555-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Gericke M, Trygg J, Fardim P. Functional Cellulose Beads: Preparation, Characterization, and Applications. Chem Rev 2013; 113:4812-36. [DOI: 10.1021/cr300242j] [Citation(s) in RCA: 177] [Impact Index Per Article: 16.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Martin Gericke
- Laboratory of Fibre and Cellulose Technology, Åbo Akademi, Porthansgatan 3, FI-20500 Turku,
Finland, Members of the European Polysaccharide Network of Excellence
(EPNOE)
| | - Jani Trygg
- Laboratory of Fibre and Cellulose Technology, Åbo Akademi, Porthansgatan 3, FI-20500 Turku,
Finland, Members of the European Polysaccharide Network of Excellence
(EPNOE)
| | - Pedro Fardim
- Laboratory of Fibre and Cellulose Technology, Åbo Akademi, Porthansgatan 3, FI-20500 Turku,
Finland, Members of the European Polysaccharide Network of Excellence
(EPNOE)
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Cho EJ, Holback H, Liu KC, Abouelmagd SA, Park J, Yeo Y. Nanoparticle characterization: state of the art, challenges, and emerging technologies. Mol Pharm 2013; 10:2093-110. [PMID: 23461379 DOI: 10.1021/mp300697h] [Citation(s) in RCA: 195] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Nanoparticles have received enormous attention as a promising tool to enhance target-specific drug delivery and diagnosis. Various in vitro and in vivo techniques are used to characterize a new system and predict its clinical efficacy. These techniques enable efficient comparison across nanoparticles and facilitate a product optimization process. On the other hand, we recognize their limitations as a prediction tool, due to inadequate applications and overly simplified test conditions. We provide a critical review of in vitro and in vivo techniques currently used for evaluation of nanoparticles and introduce emerging techniques and models that may be used complementarily.
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Affiliation(s)
- Eun Jung Cho
- Department of Industrial and Physical Pharmacy, Purdue University, West Lafayette, Indiana 47907, USA
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Zhu YD, Allen GC, Adams JM, Gittins DI, Hooper JJ, Skuse DR. Barrier properties of latex/kaolin coatings. Polym Chem 2013. [DOI: 10.1039/c3py00376k] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Rudin T, Pratsinis SE. Homogeneous Iron Phosphate Nanoparticles by Combustion of Sprays. Ind Eng Chem Res 2012; 51:7891-7900. [PMID: 23407874 DOI: 10.1021/ie202736s] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Low-cost synthesis of iron phosphate nanostructured particles is attractive for large scale fortification of basic foods (rice, bread, etc.) as well as for Li-battery materials. This is achieved here by flame-assisted and flame spray pyrolysis (FASP and FSP) of inexpensive precursors (iron nitrate, phosphate), solvents (ethanol), and support gases (acetylene and methane). The iron phosphate powders produced here were mostly amorphous and exhibited excellent solubility in dilute acid, an indicator of relative iron bioavailability. The amorphous and crystalline fractions of such powders were determined by X-ray diffraction (XRD) and their cumulative size distribution by X-ray disk centrifuge. Fine and coarse size fractions were obtained also by sedimentation and characterized by microscopy and XRD. The coarse size fraction contained maghemite Fe(2)O(3) while the fine was amorphous iron phosphate. Furthermore, the effect of increased production rate (up to 11 g/h) on product morphology and solubility was explored. Using increased methane flow rates through the ignition/pilot flame of the FSP-burner and inexpensive powder precursors resulted in also homogeneous iron phosphate nanoparticles essentially converting the FSP to a FASP process. The powders produced by FSP at increased methane flow had excellent solubility in dilute acid as well. Such use of methane or even natural gas might be economically attractive for large scale flame-synthesis of nanoparticles.
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Affiliation(s)
- Thomas Rudin
- Particle Technology Laboratory, Institute of Process Engineering, Department of Mechanical and Process Engineering, ETH Zurich, 8092 Zurich, Switzerland
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Saghiri MA, Asgar K, Lotfi M, Garcia-Godoy F. Nanomodification of mineral trioxide aggregate for enhanced physiochemical properties. Int Endod J 2012; 45:979-88. [DOI: 10.1111/j.1365-2591.2012.02056.x] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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Jäger G, Girfoglio M, Dollo F, Rinaldi R, Bongard H, Commandeur U, Fischer R, Spiess AC, Büchs J. How recombinant swollenin from Kluyveromyces lactis affects cellulosic substrates and accelerates their hydrolysis. BIOTECHNOLOGY FOR BIOFUELS 2011; 4:33. [PMID: 21943248 PMCID: PMC3203333 DOI: 10.1186/1754-6834-4-33] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2011] [Accepted: 09/23/2011] [Indexed: 05/02/2023]
Abstract
BACKGROUND In order to generate biofuels, insoluble cellulosic substrates are pretreated and subsequently hydrolyzed with cellulases. One way to pretreat cellulose in a safe and environmentally friendly manner is to apply, under mild conditions, non-hydrolyzing proteins such as swollenin - naturally produced in low yields by the fungus Trichoderma reesei. To yield sufficient swollenin for industrial applications, the first aim of this study is to present a new way of producing recombinant swollenin. The main objective is to show how swollenin quantitatively affects relevant physical properties of cellulosic substrates and how it affects subsequent hydrolysis. RESULTS After expression in the yeast Kluyveromyces lactis, the resulting swollenin was purified. The adsorption parameters of the recombinant swollenin onto cellulose were quantified for the first time and were comparable to those of individual cellulases from T. reesei. Four different insoluble cellulosic substrates were then pretreated with swollenin. At first, it could be qualitatively shown by macroscopic evaluation and microscopy that swollenin caused deagglomeration of bigger cellulose agglomerates as well as dispersion of cellulose microfibrils (amorphogenesis). Afterwards, the effects of swollenin on cellulose particle size, maximum cellulase adsorption and cellulose crystallinity were quantified. The pretreatment with swollenin resulted in a significant decrease in particle size of the cellulosic substrates as well as in their crystallinity, thereby substantially increasing maximum cellulase adsorption onto these substrates. Subsequently, the pretreated cellulosic substrates were hydrolyzed with cellulases. Here, pretreatment of cellulosic substrates with swollenin, even in non-saturating concentrations, significantly accelerated the hydrolysis. By correlating particle size and crystallinity of the cellulosic substrates with initial hydrolysis rates, it could be shown that the swollenin-induced reduction in particle size and crystallinity resulted in high cellulose hydrolysis rates. CONCLUSIONS Recombinant swollenin can be easily produced with the robust yeast K. lactis. Moreover, swollenin induces deagglomeration of cellulose agglomerates as well as amorphogenesis (decrystallization). For the first time, this study quantifies and elucidates in detail how swollenin affects different cellulosic substrates and their hydrolysis.
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Affiliation(s)
- Gernot Jäger
- AVT-Aachener Verfahrenstechnik, Biochemical Engineering, RWTH Aachen University,
Worringerweg 1, D-52074 Aachen, Germany
| | - Michele Girfoglio
- Institute of Molecular Biotechnology, RWTH Aachen University, Worringerweg 1,
D-52074 Aachen, Germany
| | - Florian Dollo
- AVT-Aachener Verfahrenstechnik, Biochemical Engineering, RWTH Aachen University,
Worringerweg 1, D-52074 Aachen, Germany
| | - Roberto Rinaldi
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, D-45470
Mülheim an der Ruhr, Germany
| | - Hans Bongard
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, D-45470
Mülheim an der Ruhr, Germany
| | - Ulrich Commandeur
- Institute of Molecular Biotechnology, RWTH Aachen University, Worringerweg 1,
D-52074 Aachen, Germany
| | - Rainer Fischer
- Institute of Molecular Biotechnology, RWTH Aachen University, Worringerweg 1,
D-52074 Aachen, Germany
- Fraunhofer Institute for Molecular Biology and Applied Ecology (IME),
Forckenbeckstrasse 6, D-52074 Aachen, Germany
| | - Antje C Spiess
- AVT-Aachener Verfahrenstechnik, Enzyme Process Technology, RWTH Aachen University,
Worringerweg 1, D-52074 Aachen, Germany
| | - Jochen Büchs
- AVT-Aachener Verfahrenstechnik, Biochemical Engineering, RWTH Aachen University,
Worringerweg 1, D-52074 Aachen, Germany
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Aschauer U, Burgos-Montes O, Moreno R, Bowen P. Hamaker 2: A Toolkit for the Calculation of Particle Interactions and Suspension Stability and its Application to Mullite Synthesis by Colloidal Methods. J DISPER SCI TECHNOL 2011. [DOI: 10.1080/01932691003756738] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Possibilities and limitations of different analytical methods for the size determination of a bimodal dispersion of metallic nanoparticles. Colloids Surf A Physicochem Eng Asp 2011. [DOI: 10.1016/j.colsurfa.2011.01.031] [Citation(s) in RCA: 152] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Aimable A, Torres Puentes A, Bowen P. Synthesis of porous and nanostructured particles of CuO via a copper oxalate route. POWDER TECHNOL 2011. [DOI: 10.1016/j.powtec.2010.08.044] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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