KONA Powder and Particle Journal最新文献_第9页

Influence of Anions and Cations on the Formation of Iron Oxide Nanoparticles in Aqueous Media 阴离子和阳离子对水介质中氧化铁纳米颗粒形成的影响

IF 4.1 4区材料科学

KONA Powder and Particle Journal Pub Date : 2020-11-28 DOI: 10.14356/kona.2022003

Hidekazu Tanaka

引用次数: 1

Synthesis of Noble Metals and Their Alloy Nanoparticles by Laser-induced Nucleation in a Highly Intense Laser Field 高强度激光场激光诱导成核合成贵金属及其合金纳米颗粒

IF 4.1 4区材料科学

KONA Powder and Particle Journal Pub Date : 2020-10-17 DOI: 10.14356/kona.2022002

Takahiro Nakamura, Yuki Yamazaki, S. Sato

{"title":"Synthesis of Noble Metals and Their Alloy Nanoparticles by Laser-induced Nucleation in a Highly Intense Laser Field","authors":"Takahiro Nakamura, Yuki Yamazaki, S. Sato","doi":"10.14356/kona.2022002","DOIUrl":"https://doi.org/10.14356/kona.2022002","url":null,"abstract":"The synthesis of noble metals and their alloy nanoparticles by laser-induced nucleation is described. Femtosecond laser pulses with an energy on the order of mJ were tightly focused to create an intensity of 10 14 W/cm 2 or more in an aqueous solution of noble metal ions. The intense laser field generated solvated electrons and hydrogen radicals that have a highly reducing ability, resulting in nucleation through the reduction of the noble metal ions and particle growth through ripening. This laser-induced nucleation method can be performed without any reducing agents. Excess irradiation of chloroauric acid solution led to the formation of a stable colloidal solution of gold nanoparticles without any surfactants. Additionally, the irradiation of a mixed solution of different noble metal ions formed solid–solution alloy nanoparticles, even though these metals were immiscible in the bulk. Moreover, the laser-induced nucleation made it possible to form quinary solid-solution alloy nanoparticles of noble metals. The mechanism of superior catalytic activity found for alloy nanoparticles by using Rh–Pd–Pt solid–solution nanoparticles is discussed in terms of elemental distributions inside the particles.","PeriodicalId":17828,"journal":{"name":"KONA Powder and Particle Journal","volume":null,"pages":null},"PeriodicalIF":4.1,"publicationDate":"2020-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88244621","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

Cohesive Powder Flow: Trends and Challenges in Characterisation and Analysis 粘性粉末流动:特征和分析的趋势和挑战

IF 4.1 4区材料科学

KONA Powder and Particle Journal Pub Date : 2020-01-10 DOI: 10.14356/kona.2020018

M. Ghadiri, M. Pasha, Wenguang Nan, C. Hare, Vivacqua, U. Zafar, S. Nezamabadi, A. López, S. Nadimi

{"title":"Cohesive Powder Flow: Trends and Challenges in Characterisation and Analysis","authors":"M. Ghadiri, M. Pasha, Wenguang Nan, C. Hare, Vivacqua, U. Zafar, S. Nezamabadi, A. López, S. Nadimi","doi":"10.14356/kona.2020018","DOIUrl":"https://doi.org/10.14356/kona.2020018","url":null,"abstract":"Powder processing and manufacturing operations are rate processes for which the bottleneck is cohesive powder flow. Diversity of material properties, particulate form, and sensitivity to environmental conditions, such as humidity and tribo-electric charging, make its prediction very challenging. However, this is highly desirable particularly when addressing a powder material for which only a small quantity is available. Furthermore, in a number of applications powder flow testing at low stress levels is highly desirable. Characterisation of bulk powder failure for flow initiation (quasi-static) is well established. However, bulk flow parameters are all sensitive to strain rate with which the powder is sheared, but in contrast to quasi-static test methods, there is no shear cell for characterisation of the bulk parameters in the dynamic regime. There are only a handful of instruments available for powder rheometry, in which the bulk resistance to motion can be quantified as a function of the shear strain rate, but the challenge is relating the bulk behaviour to the physical and mechanical properties of constituting particles. A critique of the current state of the art in characterisation and analysis of cohesive powder flow is presented, addressing the effects of cohesion, strain rate, fluid medium drag and particle shape.","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":"84261274","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

Present Status of Air Filters and Exploration of Their New Applications 空气过滤器的现状及新应用的探索

IF 4.1 4区材料科学

KONA Powder and Particle Journal Pub Date : 2020-01-10 DOI: 10.14356/KONA.2020001

Myong-Hwa Lee, Hyun Jin Choi, M. Kumita, Y. Otani

{"title":"Present Status of Air Filters and Exploration of Their New Applications","authors":"Myong-Hwa Lee, Hyun Jin Choi, M. Kumita, Y. Otani","doi":"10.14356/KONA.2020001","DOIUrl":"https://doi.org/10.14356/KONA.2020001","url":null,"abstract":"図 Abstract Air filters have been commonly used for the removal of airborne particles. Currently the major concerns of air filters are （ 1 ） improvement of collection performance - a filter with a low pressure drop and a high collection efficiency, （ 2 ） influence of dust load on filter performance - prediction of filter life and development of a filter with a longer life, and （ 3 ） collection efficiency of nanoparticles - thermal rebound of sub -10 nm particles on fiber surfaces. In addition to the conventional usages of air filters, they may also be used for the classification of aerosol particles by tuning the filter structure and filtration conditions. Inertial filter is a low - pass filter, which may be used for the sampling of atmospheric particles and continuous measurement of PM 2 . 5 or PM 0 . 1 . The bounce - off of particles on fiber surfaces may be utilized to achieve “sieving” of aerosol particles. Another topic of filter is the collection efficiency of air filter for PM 2 . 5 . Combination of centrifugal force with air filter may solve many problems which the conventional air filters are confronted with now.","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":"80434480","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: 4

Analysis of Industry-Related Flows by Optical Coherence Tomography—A Review 基于光学相干层析成像的产业相关流分析综述

IF 4.1 4区材料科学

KONA Powder and Particle Journal Pub Date : 2020-01-10 DOI: 10.14356/KONA.2020003

Antti I. Koponen, Sanna Haavisto

引用次数: 9

Development and Validation of a Simplified Laboratory Test to Design Vertical Stirred Mills 立式搅拌磨设计简化实验室试验的开发与验证

IF 4.1 4区材料科学

KONA Powder and Particle Journal Pub Date : 2020-01-10 DOI: 10.14356/KONA.2020007

M. G. Bergerman, H. D. Júnior

{"title":"Development and Validation of a Simplified Laboratory Test to Design Vertical Stirred Mills","authors":"M. G. Bergerman, H. D. Júnior","doi":"10.14356/KONA.2020007","DOIUrl":"https://doi.org/10.14356/KONA.2020007","url":null,"abstract":"The use of vertical stirred mills in the mining industry has increased remarkably over the past few decades as a result of the growing demand for finer ore grinding. This equipment is recognized to deliver higher energy efficiency in fine grinding operations when compared to conventional tubular mills. Methods of designing vertical stirred mills involve operational experience, pilot plant tests and bench tests. An important issue is that the laboratory-scale test, conducted in the standard 8\"×10\" jar, requires at least 10–20 kg of material, depending on ore density, which is not available in many cases, particularly in the early stages of greenfield projects. For regrinding of flotation concentrates, several bench scale flotation tests are required to generate such a sample. The paper describes the development and validation with six different ore samples of a simplified laboratory jar mill test using a 6\"×8\" jar, which is smaller than the 8\"×10\" size, the latter commonly used which requires about one-tenth of the mass required in the standard test. The proposed test indicated similar results as compared to the standard procedure.","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":"89322854","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

Preparation and Properties of Spherical Natural Rubber/Silica Composite Powders via Spray Drying 喷雾干燥法制备球形天然橡胶/二氧化硅复合粉体及其性能

IF 4.1 4区材料科学

KONA Powder and Particle Journal Pub Date : 2020-01-10 DOI: 10.14356/kona.2020009

S. Tang, Prachaya Sopanon, W. Tanthapanichakoon, A. Soottitantawat

{"title":"Preparation and Properties of Spherical Natural Rubber/Silica Composite Powders via Spray Drying","authors":"S. Tang, Prachaya Sopanon, W. Tanthapanichakoon, A. Soottitantawat","doi":"10.14356/kona.2020009","DOIUrl":"https://doi.org/10.14356/kona.2020009","url":null,"abstract":"In this work, composite powders of natural rubber/silica (NR-SiO 2 ) were prepared via sol-gel and spray drying method. The morphology and physical properties of resultant rubber composite powders were characterized by scanning electron microscopy with energy dispersive X-ray spectrometry, laser light scattering particle sizer and thermogravimetric analyzer. The results showed that spray-dried NR-SiO 2 particles were spherical in shape with diameter of less than 10 μm, with silica on the outer layer. The particle size was found to increase gradually with the increase in NR/Si mass ratio. Marginal growth in particle size was observed with increasing feed flow rate. Increasing inlet air temperature improved the latex particle encapsulation by silica layer while maintaining the final particle size. The mechanical properties of NR-SiO 2 powders-filled polylactic acid (PLA) composite increase gradually with the addition of dried particles of higher rubber content. However, the composite exhibited relatively lower or reduced tensile strength and elongation at break compared to the host PLA polymer. This could be attributed to poor filler dispersion associated with weak filler/matrix interaction effect occurring during melt-compounding process.","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":"83108485","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

Electrodynamic Sorting of Industrial Scrap Metal 工业废金属的电动分选

IF 4.1 4区材料科学

KONA Powder and Particle Journal Pub Date : 2020-01-10 DOI: 10.14356/kona.2020015

J. Nagel, D. Cohrs, J. Salgado, R. Rajamani

引用次数: 4

Recent Progress on Mesh-free Particle Methods for Simulations of Multi-phase Flows: A Review 多相流模拟的无网格粒子方法研究进展

IF 4.1 4区材料科学

KONA Powder and Particle Journal Pub Date : 2020-01-10 DOI: 10.14356/kona.2020017

M. Sakai, Y. Mori, Xiaosong Sun, K. Takabatake

{"title":"Recent Progress on Mesh-free Particle Methods for Simulations of Multi-phase Flows: A Review","authors":"M. Sakai, Y. Mori, Xiaosong Sun, K. Takabatake","doi":"10.14356/kona.2020017","DOIUrl":"https://doi.org/10.14356/kona.2020017","url":null,"abstract":"The discrete element method (DEM) and the moving particle semi-implicit (MPS) method are the most popular mesh-free particle methods in the discontinuum and continuum. This paper describes a state-of-the-art modeling on multi-phase flows using these mesh-free particle methods. Herein, a combinational model of the signed distance function (SDF) and immersed boundary method (IBM) is introduced for an arbitrary-shaped wall boundary in the DEM simulation. Practically, this model uses a simple operation to create the wall boundary. Although the SDF is a scalar field for the wall boundary of the DEM, it is useful for the wall boundary of the CFD through combination with the IBM. Validation tests are carried out to demonstrate the adequacy of the SDF/IBM wall boundary model. Regarding the mesh-free particle method for continuum, the phase change problem is one of the challenging topics, as the solid state is usually modeled by extremely high viscous fluid in the phase change simulation. The phase change simulation is shown to be efficiently performed through an implicit algorithm and a heat flux model in the MPS method. The adequacy of these models is verified by the numerical examples.","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":"87853414","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: 27

The KONA Award 2018 2018年KONA奖

IF 4.1 4区材料科学

KONA Powder and Particle Journal Pub Date : 2020-01-10 DOI: 10.14356/kona.2020023

引用次数: 0