KONA Powder and Particle Journal最新文献_第10页

Real-time in-situ Rheological Assessment of Sticky Point Temperature and Humidity of Powdered Products 粉状产品粘点温度和湿度的实时原位流变学评价

IF 4.1 4区材料科学

KONA Powder and Particle Journal Pub Date : 2020-01-10 DOI: 10.14356/KONA.2020006

J. Groen, W. Kooijman, Djamilla van Belzen, G. Meesters, D. Schütz, Timothy Aschl, P. Verolme

{"title":"Real-time in-situ Rheological Assessment of Sticky Point Temperature and Humidity of Powdered Products","authors":"J. Groen, W. Kooijman, Djamilla van Belzen, G. Meesters, D. Schütz, Timothy Aschl, P. Verolme","doi":"10.14356/KONA.2020006","DOIUrl":"https://doi.org/10.14356/KONA.2020006","url":null,"abstract":"Unwanted changes in powder flow behavior can unexpectedly occur when a product is exposed to certain conditions of temperature and humidity. This can happen during production, but also during transport or storage. The work reported here demonstrates the novel approach of using an amended powder rheology set-up for measuring and predicting such changes in powder flow behavior. The developed methodology makes it possible to vary in-situ the temperature and the relative humidity of the air to which the product is exposed, thereby mimicking realistic conditions of production or related unit operations. An air flow capable of fluidizing the powder particles is controlled at a specific constant temperature and its relative humidity can be altered while measuring the torque in the fluidized powder bed in real time. The fluidization is necessary for generating a homogeneous introduction of temperature and relative humidity. Results obtained using citric acid and commercial coffee whitener products have proven this methodology to provide both similar and in certain instances dissimilar results compared to the more established methodology such as measuring the vapour adsorption isotherms. These observations are explained. In this way, it can be predicted under which combinations of temperature and humidity a product does or does not become sticky. The main advantages of our approach are that the flow properties are directly assessed, the interpretation of the obtained data is more straightforward and that the measurement times are shortened substantially.","PeriodicalId":17828,"journal":{"name":"KONA Powder and Particle Journal","volume":null,"pages":null},"PeriodicalIF":4.1,"publicationDate":"2020-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90556085","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

The 53rd Symposium on Powder Technology 第53届粉末技术研讨会

IF 4.1 4区材料科学

KONA Powder and Particle Journal Pub Date : 2020-01-10 DOI: 10.14356/kona.2020022

引用次数: 0

Integrating Particle Microstructure, Surface and Mechanical Characterization with Bulk Powder Processing 将颗粒微观结构、表面和力学特性与散装粉末加工相结合

IF 4.1 4区材料科学

KONA Powder and Particle Journal Pub Date : 2020-01-10 DOI: 10.14356/kona.2020008

R. Pinal, M. Carvajal

{"title":"Integrating Particle Microstructure, Surface and Mechanical Characterization with Bulk Powder Processing","authors":"R. Pinal, M. Carvajal","doi":"10.14356/kona.2020008","DOIUrl":"https://doi.org/10.14356/kona.2020008","url":null,"abstract":"Multiple industrial applications, including pharmaceuticals, rely on the processing of powders. The current powder characterization framework is fragmented into two general areas. One deals with understanding powders from the standpoint of its constituting agents—particles. The other deals with understanding based on the bulk— the collective behavior of particles. While complementary, the two aspects provide distinct pieces of information. Whenever possible, experimental techniques should be used to predict powder behavior. However, it is equally important to recognize that because of the natural complexity of powders, existing predictive approaches will continue to be of limited success for predicting the collective behavior of particles. This article discusses the understanding of powder properties from two perspectives. One is the effect of surface energy at the bulk level (large collections of particles), which controls interactions between powders. This aspect is most useful if studied at the bulk-powder level, not at the single-particle level. Another perspective deals with the physico-mechanical properties of individual particles, responsible for the observed behavior of powders when subjected to mechanical stress from unit operations such as milling. This aspect, which controls the failure mechanism of powders subjected to milling, is most useful if assessed at the single-particle, not at the bulk level. Therefore, in order to fully understand, and eventually predict, or at least effectively model powder behavior, a good-judgement-based combination of microscopic and bulk-level analytical methods is necessary.","PeriodicalId":17828,"journal":{"name":"KONA Powder and Particle Journal","volume":null,"pages":null},"PeriodicalIF":4.1,"publicationDate":"2020-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80453742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

General Information 一般信息

IF 4.1 4区材料科学

KONA Powder and Particle Journal Pub Date : 2020-01-10 DOI: 10.14356/kona.2020024

引用次数: 0

NMR as a Tool to Characterize the Aggregation Structure of Silica Nanoparticles in a Liquid 核磁共振作为表征液体中二氧化硅纳米颗粒聚集结构的工具

IF 4.1 4区材料科学

KONA Powder and Particle Journal Pub Date : 2020-01-10 DOI: 10.14356/KONA.2020012

Chika Takai-Yamashita, Emiko Sato, M. Fuji

引用次数: 12

Microbial Aerosols: Sources, Properties, Health Effects, Exposure Assessment—A Review 微生物气溶胶:来源，性质，健康影响，暴露评估综述

IF 4.1 4区材料科学

KONA Powder and Particle Journal Pub Date : 2020-01-10 DOI: 10.14356/KONA.2020005

R. Górny

{"title":"Microbial Aerosols: Sources, Properties, Health Effects, Exposure Assessment—A Review","authors":"R. Górny","doi":"10.14356/KONA.2020005","DOIUrl":"https://doi.org/10.14356/KONA.2020005","url":null,"abstract":"Microorganisms are ubiquitous in the environment. Wherever their sources are present, the particles can be released into the air forming microbiological aerosols. Although most of their particles cause no harm to the exposed individuals, some of their propagules may have infectious or allergenic potential and may carry toxic or irritant substances and components. Their inhalation usually poses a significant health risk and is responsible for numerous adverse outcomes, from allergic reactions, infections and toxic responses to various nonspecific symptoms. This review article provides fundamental background information on the role of microorganisms in the environment, defines and characterizes environmental sources of microbial aerosols, describes microbial abilities for airborne transport and comments on their role in atmospheric processes, discusses their physical and biological characteristics which result in adverse health outcomes observed in exposed individuals. The paper characterizes comprehensively numerous sampling and analysis techniques involved in the quantitative and qualitative evaluation of microbial aerosols together with their practical applications, presents strategies applied in the assessment of harmful microbial agents formed by bioaerosols, explains the ways of creating hygienic standards (understood here as reference/threshold limits) for microbiological aerosols conditioned by both medical and environmental determinants, and comments on their usefulness in the control and protection of environment and health.","PeriodicalId":17828,"journal":{"name":"KONA Powder and Particle Journal","volume":null,"pages":null},"PeriodicalIF":4.1,"publicationDate":"2020-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80188174","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 38

Review of Encapsulated Salt Hydrate Core-Shell Phase Change Materials 包封盐水合物核壳相变材料研究进展

IF 4.1 4区材料科学

KONA Powder and Particle Journal Pub Date : 2020-01-10 DOI: 10.14356/KONA.2020010

Wang Hui, Yunfa Chen, Jianqiang Li, Lijiang Guo, M. Fang

引用次数: 21

Synthesis of Precision Gold Nanoparticles Using Turkevich Method. Turkevich法合成精密金纳米颗粒。

IF 4.1 4区材料科学

KONA Powder and Particle Journal Pub Date : 2020-01-10 Epub Date: 2020-02-29 DOI: 10.14356/kona.2020011

Jiaqi Dong, Paul L Carpinone, Georgios Pyrgiotakis, Philip Demokritou, Brij M Moudgil

{"title":"Synthesis of Precision Gold Nanoparticles Using Turkevich Method.","authors":"Jiaqi Dong, Paul L Carpinone, Georgios Pyrgiotakis, Philip Demokritou, Brij M Moudgil","doi":"10.14356/kona.2020011","DOIUrl":"https://doi.org/10.14356/kona.2020011","url":null,"abstract":"Gold nanoparticles (AuNPs) exhibit unique size-dependent physiochemical properties that make them attractive for a wide range of applications. However, the large-scale availability of precision AuNPs has been minimal. Not only must the required nanoparticles be of precise size and morphology, but they must also be of exceedingly narrow size distribution to yield accurate and reliable performance. The present study aims to synthesize precision AuNPs and to assess the advantages and limitations of the Turkevich method-one of the common chemical synthesis technique. Colloidal AuNPs from 15 nm to 50 nm in diameter were synthesized using the Turkevich method. The effect of the molar ratio of the reagent mixture (trisodium citrate to gold chloride), the scaled-up batch size, the initial gold chloride concentration, and the reaction temperature was studied. The morphology, optical property, surface chemistry, and chemical composition of AuNPs were thoroughly characterized. It was determined that the as-synthesized AuNPs between 15 nm and 30 nm exhibit well-defined size and shape, and narrow size distribution (PDI < 0.20). However, the AuNPs became more polydispersed and less spherical in shape as the particle size increased.","PeriodicalId":17828,"journal":{"name":"KONA Powder and Particle Journal","volume":null,"pages":null},"PeriodicalIF":4.1,"publicationDate":"2020-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.14356/kona.2020011","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"37722047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 115

Shape Controllable Synthesis of Silver Particles by Selecting the Crystallization Routes 选择结晶路线合成形状可控的银颗粒

IF 4.1 4区材料科学

KONA Powder and Particle Journal Pub Date : 2020-01-10 DOI: 10.14356/KONA.2020004

Jianmei Liu, Q. Lin, Yu Zhou, J. Dai, Yongsheng Han

{"title":"Shape Controllable Synthesis of Silver Particles by Selecting the Crystallization Routes","authors":"Jianmei Liu, Q. Lin, Yu Zhou, J. Dai, Yongsheng Han","doi":"10.14356/KONA.2020004","DOIUrl":"https://doi.org/10.14356/KONA.2020004","url":null,"abstract":"Classic crystallization describes a burst nucleation followed by a layer-by-layer atom deposition. The non-classic crystallization refers to particle mediated crystallization process. Different crystallization routes lead to the formation of diverse structured materials. Here we report a rational synthesis of silver particles by selecting the crystallization routes. Silver particles were synthesized by a solution reduction approach. The crystallization routes were regulated by adding amino acids to stabilize silver ions which leads to the decrease of the reduction rate. Without amino acids, silver dendrites were largely formed. With the addition of amino acids, flower-like (low concentration of amino acids) and spherical silver (high concentration of amino acid) particles were synthesized. Three kinds of amino acids were tested and the similar results were obtained. The time-dependent characterization on the evolution of silver particles showed that silver dendrites were formed by the classic atom deposition while the other two morphologies were formed by the combination of classic and non-classic crystallization. The silver particles synthesized were evaluated for ethylene epoxidation and the dendritic particles demonstrated a high selectivity.","PeriodicalId":17828,"journal":{"name":"KONA Powder and Particle Journal","volume":null,"pages":null},"PeriodicalIF":4.1,"publicationDate":"2020-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90833951","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Production of Hematite Micro- and Nanoparticles in a Fluidized Bed Process—Mechanism Study 流化床工艺制备赤铁矿微颗粒及纳米颗粒的机理研究

IF 4.1 4区材料科学

KONA Powder and Particle Journal Pub Date : 2020-01-10 DOI: 10.14356/kona.2020014

N. Bolay, R. Lakhal, M. Hemati

{"title":"Production of Hematite Micro- and Nanoparticles in a Fluidized Bed Process—Mechanism Study","authors":"N. Bolay, R. Lakhal, M. Hemati","doi":"10.14356/kona.2020014","DOIUrl":"https://doi.org/10.14356/kona.2020014","url":null,"abstract":"A continuous, compact and simple process was developed to synthesize micro- and nanoparticles of iron oxide. The process combines the spraying (pulverization) of an aqueous solution of iron nitrate in a fluidized bed reactor containing coarse and hot glass beads ( T = 200 °C) for the production of solids and a transported bed reactor for calcination ( T = 490 °C). The intermediate product formed in the fluidized bed reactor is 2-line ferrihydrite, while the calcination reactor allows the production of hematite micro- and nanoparticles. These particles are characterized by a narrow size distribution, a mean size of 0.5 μm, a specific surface area of 24 m 2 g –1 and a density of 4499 kg m –3 . Particles are made up of small clusters of crystallites having an average size of 47 nm and a low internal porosity (0.12). The reaction mechanism was studied using a muffle furnace and a lab convective dryer. It was found that several steps are involved leading first to the production of iron nitrate dihydrate after the removal of the solution water, as well as two and then five molecules of water of hydration. After that, the elimination of nitrate leads to the production of ferrihydrite. Finally, ferrihydrite is transformed into hematite due to the removal of residual nitrate and water of hydroxylation.","PeriodicalId":17828,"journal":{"name":"KONA Powder and Particle Journal","volume":null,"pages":null},"PeriodicalIF":4.1,"publicationDate":"2020-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76704806","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1