Micron最新文献 - Book学术

Microstructural analysis applied to carbonate matrix acidizing: An overview and a case study 应用于碳酸盐基质酸化的微结构分析：概述与案例研究

IF 2.5 3区工程技术

Micron Pub Date : 2024-09-25 DOI: 10.1016/j.micron.2024.103724

{"title":"Microstructural analysis applied to carbonate matrix acidizing: An overview and a case study","authors":"","doi":"10.1016/j.micron.2024.103724","DOIUrl":"10.1016/j.micron.2024.103724","url":null,"abstract":"<div><div>Carbonate formations constitute the primary source of hydrocarbon reservoirs worldwide, highlighting the importance of gaining a deeper understanding of matrix acidizing phenomena to enhance well productivity in these formations. Microstructural analysis of acidified cores is a key method to assess acidizing systems in carbonate rock samples. X-ray computed microtomography (Micro-CT) has significantly contributed to this field, primarily focusing on the qualitative and quantitative characterization of the profiles of carbonate mineral dissolution, also known as wormholes, created during matrix acidizing. This non-destructive evaluation technique allows the internal analysis of a sample without altering its internal structure or chemical composition. This work focuses on a comprehensive review of the research studies and the main applications of micro-CT for evaluating and characterizing matrix acidizing in carbonates. First, an overview of the fundamentals of micro-CT and acid stimulation in carbonates is provided. Next, the applications of micro-CT are discussed and grouped into microstructural characteristics of wormholes, dynamic in-situ experiments, and pore-scale modeling topics. A case study is presented with a methodology based on micro-CT analysis for matrix acidizing. Finally, future work and current challenges, such as 4D CT and CT-based acidizing models, are discussed.</div></div>","PeriodicalId":18501,"journal":{"name":"Micron","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142359067","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Compact vacuum transfer devices for highly air-sensitive materials in scanning electron microscopy 用于扫描电子显微镜中高气敏性材料的紧凑型真空传输装置

IF 2.5 3区工程技术

Micron Pub Date : 2024-09-21 DOI: 10.1016/j.micron.2024.103720

{"title":"Compact vacuum transfer devices for highly air-sensitive materials in scanning electron microscopy","authors":"","doi":"10.1016/j.micron.2024.103720","DOIUrl":"10.1016/j.micron.2024.103720","url":null,"abstract":"<div><div>Surface analysis experiments on air-sensitive substances are challenging to avoid their contact with air, leading to inaccurate results due to oxidation or hygroscopicity. To address this issue, we designed a compact vacuum transfer device (VTD) and applied it to scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) experiments. Our VTD features a split structure that can be opened and separated in the SEM specimen exchange chamber via magnetic control. This design allows the SEM manufacturer's stub to be fed directly into the SEM specimen chamber, preventing damage to the instrument's internal components and avoiding restrictions on specimen height. Additionally, the compact design maximizes the utilization of sample accommodation space. Besides, it can be flexibly customized in different sizes and types of stubs to adapt electron microscopes from various manufacturers. To confirm the reliability of our device, we applied it to several highly air-sensitive samples for morphology and chemical composition analysis by SEM and EDS. The EDS results showed that the atomic percentage of Na reaches 94.55 % after 14 minutes and 93.44 % after 30 minutes of storage when transferring metallic sodium. Furthermore, our VTD enables airtight recycling and re-transfer of samples after the SEM (-EDS) experiments. These results demonstrate that our device has excellent practicality and airtightness, making it suitable for medium- and long-distance sample transfer between laboratories on the campus.</div></div>","PeriodicalId":18501,"journal":{"name":"Micron","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142322671","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Predicting ELNES/XANES spectra by machine learning with an atomic coordinate-independent descriptor and its application to ground-state electronic structures 利用与原子坐标无关的描述符通过机器学习预测 ELNES/XANES 光谱及其在基态电子结构中的应用。

IF 2.5 3区工程技术

Micron Pub Date : 2024-09-19 DOI: 10.1016/j.micron.2024.103723

引用次数: 0

Direct monitoring of the enzymatically sequestering and degrading of PET microplastics using hyperspectral Raman microscopy 利用高光谱拉曼显微镜直接监测 PET 微塑料的酶封存和降解过程。

IF 2.5 3区工程技术

Micron Pub Date : 2024-09-18 DOI: 10.1016/j.micron.2024.103722

引用次数: 0

The spermatheca ultrastructure of the ground beetle Clinidium canaliculatum (Costa) (Carabidae, Rhysodinae) 地鳖虫Clinidium canaliculatum (Costa) (Carabidae, Rhysodinae) 的精巢超微结构

IF 2.5 3区工程技术

Micron Pub Date : 2024-09-17 DOI: 10.1016/j.micron.2024.103721

{"title":"The spermatheca ultrastructure of the ground beetle Clinidium canaliculatum (Costa) (Carabidae, Rhysodinae)","authors":"","doi":"10.1016/j.micron.2024.103721","DOIUrl":"10.1016/j.micron.2024.103721","url":null,"abstract":"<div><p>The ground beetle <em>Clinidium canaliculatum</em> is a member of Rhysodinae, a taxon with still discussed systematic position. The spermatheca of this species is a small cylindrical structure connected to the common oviduct by a thin duct. The ultrastructure of the organ has revealed that the apical receptacle is provided with an epithelium lined by a thick cuticle from the deeper region of which several finger-like cuticular structures extend into the cytoplasm. On these structures adhere microtubule bundles that cross the whole cytoplasm to anchor on short densities along the basal plasma membrane. These specializations are strongly reminiscent of the hemidesmosomes, possibly playing a mechanical role enabling the cells to resist to the muscle contractions pushing the sperm towards the spermathecal duct. The cells are rich in mitochondria and glycogen granules and they are possibly involved in fluid uptake from the spermathecal lumen. The spermathecal duct has a simple epithelium lined by a soft cuticle. The sperm present in the apical receptacle and in the duct lumen maintain the structure described in the male genital apparatuses. They are generally free and embedded in a homogeneous electron-dense material. Occasionally, a sperm bundle, still with an apical cap, was visible in the spermathecal receptacle.</p></div>","PeriodicalId":18501,"journal":{"name":"Micron","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142270762","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Prospect for detecting magnetism in two-dimensional perovskite oxides by electron magnetic circular dichroism 利用电子磁性圆二色性探测二维包晶氧化物磁性的前景

IF 2.5 3区工程技术

Micron Pub Date : 2024-09-16 DOI: 10.1016/j.micron.2024.103718

{"title":"Prospect for detecting magnetism in two-dimensional perovskite oxides by electron magnetic circular dichroism","authors":"","doi":"10.1016/j.micron.2024.103718","DOIUrl":"10.1016/j.micron.2024.103718","url":null,"abstract":"<div><p>Two-dimensional (2D) magnets, especially strongly correlated 2D transition-metal perovskite oxides, have attracted significant attention due to their intriguing electromagnetic properties for potential applications in spintronic devices. Potentially electron magnetic circular dichroism (EMCD) under zone axis conditions can provide three-dimensional components of magnetic moments in 2D materials, but the collection efficiency and the signal-to-noise ratio for out-of-plane (OOP) components is limited due to the limited collection angle. Here we conducted a comprehensive computational simulation to optimize the experimental setting of EMCD for detecting the OOP components of magnetic moments in three beam conditions (3BCs) on 2D perovskite oxides La<sub>1-x</sub>Sr<sub>x</sub>MnO<sub>3</sub> (LSMO) in a TEM. The key parameters are sample thickness, accelerating voltage, Sr doping concentration, collection semi-angle and position, and sample orientation including systematic reflections excited and tilt angle. Our simulation results demonstrate that the relative dynamical diffraction coefficients of Mn OOP EMCD of LaMnO<sub>3</sub> with a thickness ranging from 1 unit cell (uc) to 4 uc can be optimized in a 3BC with (110) systematic reflections excited and a relatively large collection semi-angle of 19 mrad at the relatively low accelerating voltage of 80 kV. In most cases, the relative dynamic diffraction coefficients for La<sub>1-x</sub>Sr<sub>x</sub>MnO<sub>3</sub> with the thickness ranging from 1 uc to 4 uc decrease with the increase of the Sr doping concentrations. The optimal tilt angle from a zone axis to a 3BC is 18° for the cases of the LSMO thickness of 2 uc, 3 uc and 4 uc, and 22° for the monolayer LSMO. Our work provides the theoretical simulation foundation for optimized EMCD experiments for measuring OOP components of magnetic moments in 2D transition-metal perovskite oxides.</p></div>","PeriodicalId":18501,"journal":{"name":"Micron","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142270761","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Piezo tube stacked scanning tunneling microscope for use in extreme and confined environments 压电管堆叠式扫描隧道显微镜，可在极端和密闭环境中使用

IF 2.5 3区工程技术

Micron Pub Date : 2024-09-16 DOI: 10.1016/j.micron.2024.103719

{"title":"Piezo tube stacked scanning tunneling microscope for use in extreme and confined environments","authors":"","doi":"10.1016/j.micron.2024.103719","DOIUrl":"10.1016/j.micron.2024.103719","url":null,"abstract":"<div><p>Scanning Tunneling Microscopy (STM) is widely used for observing atomic structures due to its ultra-high spatial resolution. As the core units of STM, the coarse stepper motor and imaging unit, have conflicting size requirements for piezo tubes. Longer piezo tubes yield greater output force and easier movement for the motor, while shorter tubes enhance imaging precision and stability for the scanner. Traditional STMs typically employ a large piezo tube for coarse stepping and a smaller one for independent imaging to address this issue. Here, we present the new design of a piezo tube stacked STM, in which two independent piezo tubes act together during tip-sample approach process and only one shorter tube works during scanning imaging. Both tubes are fixed to the framework, ensuring high rigidity and compactness. The new design enables us to achieve both coarse stepping and imaging functions with a total length of only 25 mm for the two tubes, effectively reducing the length of whole STM, facilitating its integration into narrow low-temperature spaces for imaging applications. Using this device, we obtained high-quality atomic images of graphite sample surfaces at room temperature. Continuous scanning imaging of the same area on Au film at 300 K demonstrates the STM’s high stability in both X-Y and Z directions. Atomic images, I-V spectra, and di/dv spectra obtained at 2 K on graphite surface illustrate the excellent application potential of this device in low-temperature environments. Finally, atomic images obtained of graphite in sweeping the magnetic fields from 0 T to 11 T in a huge vibrational dry magnet prove the new STM’s excellent performance in extreme conditions.</p></div>","PeriodicalId":18501,"journal":{"name":"Micron","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142243899","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ultrastructural changes in the spermatogenic cells of domestic chicken (Gallus gallus domesticus) observed at different reproductive stages 观察家鸡（Gallus gallus domesticus）精原细胞在不同生殖阶段的超微结构变化

IF 2.5 3区工程技术

Micron Pub Date : 2024-09-13 DOI: 10.1016/j.micron.2024.103717

{"title":"Ultrastructural changes in the spermatogenic cells of domestic chicken (Gallus gallus domesticus) observed at different reproductive stages","authors":"","doi":"10.1016/j.micron.2024.103717","DOIUrl":"10.1016/j.micron.2024.103717","url":null,"abstract":"<div><p>Spermatogenesis is a complex process. It is the modification of progenitor spermatogonia into mature spermatozoa. The stages are similar in all-male vertebrates, as well as avian species. However, studies on spermatogenesis in birds are fewer compared to mammals. The current study investigated the ultrastructural changes in the spermatogenic cells of domestic chickens in different reproductive stages. Thirty (30) male birds, ten (10) in each of the three reproductive stages: pre-pubertal, pubertal, and adult were used in the study. Testicular tissues from all age groups were processed for transmission electron microscopy (TEM). TEM results showed spermatogonia and primary spermatocytes in the pre-pubertal testis, and the seminiferous tubule lumen was wide and empty. Also, the nuclei of spermatogonia at this stage did not contain condensed chromatin material at the center nor scattered at the periphery of the nuclear membrane. There were slight differences between the spermatogenic cells in the pubertal and adult age groups. The spermatogonia, primary and secondary spermatocytes, and round spermatids with scanty chromatin material were observed in both age groups. In the adult age group, round and elongated spermatids with condensed chromatin materials were observed besides the other spermatogenic cells. Also, the seminiferous tubule lumen was filled with sperm cells and cellular debris, unlike in the pre-pubertal and pubertal age groups where they were wide and empty. The presence of numerous oval mitochondria were observed in all age groups. This signifies the active process of spermatogenesis in pre-pubertal, pubertal, and adult male domestic chickens.</p></div>","PeriodicalId":18501,"journal":{"name":"Micron","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142243900","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Microscopic characterizations for 2D material-based advanced electronics 基于二维材料的先进电子器件的微观表征

IF 2.5 3区工程技术

Micron Pub Date : 2024-09-12 DOI: 10.1016/j.micron.2024.103707

引用次数: 0

A review on SEM imaging of graphene layers 石墨烯层的扫描电镜成像综述

IF 2.5 3区工程技术

Micron Pub Date : 2024-09-11 DOI: 10.1016/j.micron.2024.103716

引用次数: 0