Johnson Matthey Technology Review最新文献_第5页

Porous Metallic Implants from Additive Manufacturing to Biocorrosion: A Review 从增材制造到生物腐蚀的多孔金属植入物:综述

IF 2.3 4区化学

Johnson Matthey Technology Review Pub Date : 2023-01-01 DOI: 10.1595/205651324x16826780236175

Salwa El Baakili, Patrick Munyensanga, Meriame Bricha, K. El Mabrouk

{"title":"Porous Metallic Implants from Additive Manufacturing to Biocorrosion: A Review","authors":"Salwa El Baakili, Patrick Munyensanga, Meriame Bricha, K. El Mabrouk","doi":"10.1595/205651324x16826780236175","DOIUrl":"https://doi.org/10.1595/205651324x16826780236175","url":null,"abstract":"The improved bulk and surface function of manufactured implants has advanced implantation procedures, leading to a decline in surgical risks. Most of the current techniques discussed in the literature are related to additive manufacturing (AM) of lightweight implants based on reliable, precise, flexible scaffolds and capable of mimicking bone properties while incorporating multi-physics features. Furthermore, these techniques have evolved in the production of a variety of biocompatible materials. AM has progressed beyond prototype to full-scale manufacturing of metals, polymers, and ceramic products. However, metallic implants often fail in vivo due to biocorrosion and deterioration, limiting implant longevity. This study reviewed current trends and approaches to enhancing the surface corrosion resistance of porous metallic implants and the effect of interfacial films on biological activity. The art of porous metallic implants manufactured by additive manufacturing and their biocorrosion behavior are discussed. This review also evaluates future trends and perspectives in additively manufactured synthetic orthopedic implants porous with enhanced surface morphology.","PeriodicalId":14807,"journal":{"name":"Johnson Matthey Technology Review","volume":"1 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67352017","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Guest Editorial: Facility Process Safety and Control 嘉宾评论:设施过程安全与控制

IF 2.3 4区化学

Johnson Matthey Technology Review Pub Date : 2023-01-01 DOI: 10.1595/205651323x16679225966590

J. Pearce

引用次数: 0

“PGM Market Report May 2023” 《2023年5月PGM市场报告》

IF 2.3 4区化学

Johnson Matthey Technology Review Pub Date : 2023-01-01 DOI: 10.1595/205651323x16856083453770

A. Cowley

引用次数: 4

Advertisement: Johnson Matthey Virtual Platinum Group Metal Conference 2023 广告:庄信万丰虚拟铂金集团金属会议2023

IF 2.3 4区化学

Johnson Matthey Technology Review Pub Date : 2023-01-01 DOI: 10.1595/205651323x16869233430585

Emma Schofield

引用次数: 0

Rhodium and Rhodium-Alloy Films and Nanoparticles 铑和铑合金薄膜和纳米颗粒

IF 2.3 4区化学

Johnson Matthey Technology Review Pub Date : 2023-01-01 DOI: 10.1595/205651324x16794770872879

Yicheng Zhou, Wangping Wu, Qinqin Wang, Liangbing Wang

引用次数: 0

Impact of Fermentation Conditions and Purification Strategy on Bacterial Cellulose Properties 发酵条件和纯化策略对细菌纤维素性质的影响

IF 2.3 4区化学

Johnson Matthey Technology Review Pub Date : 2023-01-01 DOI: 10.1595/205651323x16794186402492

H. Yu, Kacper Bruzda, D. Charalampopoulos, A. Chatzifragkou

引用次数: 0

Moving from Fuel to Feedstock: Selective Hydrocarbon Activation using Rhodium and Iridium Complexes 从燃料到原料:使用铑和铱配合物的选择性碳氢化合物活化

IF 2.3 4区化学

Johnson Matthey Technology Review Pub Date : 2023-01-01 DOI: 10.1595/205651323x16765646706676

Paul A. Morton, S. M. Mansell

{"title":"Moving from Fuel to Feedstock: Selective Hydrocarbon Activation using Rhodium and Iridium Complexes","authors":"Paul A. Morton, S. M. Mansell","doi":"10.1595/205651323x16765646706676","DOIUrl":"https://doi.org/10.1595/205651323x16765646706676","url":null,"abstract":"Carbon-hydrogen bond activations and their subsequent functionalisation have long been an important target in chemistry because C-H bonds are ubiquitous throughout nature, making C-H derivatisation reactions highly desirable. The selective and efficient functionalisation of this bond into many more useful carbon-element bonds (e.g., C-B, C-Si, C-O, and C-S bonds) would have many uses in pharmaceutical and bulk chemical synthesis. Activation of the C-H bond is, however, challenging due to the high strength and low bond-polarity of this bond rendering its cleavage unfavourable. With the correct choice of reagents and systems, especially those utilising directing groups, kinetically and thermodynamically favourable catalytic processes have been developed. However, a key remaining challenge is the development of undirected, intermolecular reactions using catalysts that are both selective and active enough to make useful processes. In this review, the progress towards optimising group 9 C-H activation catalysts is discussed, particularly focusing on undirected reactions that are kinetically more difficult, starting with a brief history of C-H activation, identifying the importance of auxiliary ligands including the nature of anionic ligand (e.g., cyclopentadienyl, indenyl, fluorenyl, trispyrazolylborate) and neutral ligands (e.g., phosphines, carbonyl, alkenes, N-heterocyclic carbenes) that contribute towards the stability and reactivity of these metal complexes. The tethering of the anionic ligand to strong σ-donating ligands is also briefly discussed. The focus of this review is primarily on the group 9 metals rhodium and iridium, however, C-H activation using group 8 and 10 metals are compared where useful. The most recent advances in this field include the development of C-H borylation of many small hydrocarbon substrates such as arenes, heterocycles and n-alkanes as well as the more challenging substrate methane.","PeriodicalId":14807,"journal":{"name":"Johnson Matthey Technology Review","volume":"1 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67352274","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hydrogen Spillover Mechanisms on Cu/ZnO-Based Catalysts for CO2 Hydrogenation to Methanol Cu/ zno基催化剂对CO2加氢制甲醇的氢溢出机理

4区化学

Johnson Matthey Technology Review Pub Date : 2023-01-01 DOI: 10.1595/205651324x16980703569747

Mustafa Al Salmi

引用次数: 0

Emergency Medical Response for Non-Hospitalized Person Events in a Children's Hospital. 儿童医院对非住院病人事件的紧急医疗响应。

IF 8 4区化学

Johnson Matthey Technology Review Pub Date : 2022-03-15 DOI: 10.1542/hpeds.2021-006268

Olivia L Hoffman, Jane Romano, Monica E Kleinman

{"title":"Emergency Medical Response for Non-Hospitalized Person Events in a Children's Hospital.","authors":"Olivia L Hoffman, Jane Romano, Monica E Kleinman","doi":"10.1542/hpeds.2021-006268","DOIUrl":"10.1542/hpeds.2021-006268","url":null,"abstract":"Objectives: Hospital-based code blue (CB) teams are designed for hospitalized patients (HP) with unanticipated medical emergencies outside of an ICU. At our freestanding pediatric institution, the same team responds to CB calls involving nonhospitalized persons (NHP) throughout the hospital campus. We hypothesized there are significant differences between the characteristics of NHP and HP requiring emergency medical response, and most responses for NHP do not require advanced critical care.Methods: We analyzed a retrospective cohort of CB responses at our large, urban, academic children's medical center from January to December 2017. We evaluated the demographic and clinical characteristics of these HP compared with NHP events.Results: There were 168 CB activations during the study, of which 135 (80.4%) were for NHP. Ninety-one (67.4%) of the NHP responses involved adults (age >18 years) compared with 6 (18.2%) of the HP. Triggers for CB team activation for NHP were most frequently syncope (42.2%), seizure (10.3%), or fall (9.6%) compared with seizure (30.3%), hypoxia (27.3%), or anaphylaxis (12.1%) for HP. Critical interventions such as bag-mask ventilation and cardiopulmonary resuscitation were infrequently performed for either cohort.Conclusions: CB activations in our pediatric institution more often involve NHP than HP. NHP responses are more likely to involve adults and infrequently require advanced interventions. Use of a pediatric CB team for NHP events may be an unnecessary use of pediatric critical care resources. Future studies are warranted to evaluate the most effective team composition, training, and response system for NHP in a freestanding children's hospital.","PeriodicalId":14807,"journal":{"name":"Johnson Matthey Technology Review","volume":"1 1","pages":""},"PeriodicalIF":8.0,"publicationDate":"2022-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89465388","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Using Spraying as an Alternative Method for Transferring Capsules Containing Shea Butter to Denim and Non-Denim Fabrics : Preparation of microcapsules for delivery of active ingredients 使用喷雾作为将含有乳木果油的胶囊转移到牛仔布和非牛仔布织物上的替代方法:制备用于传递活性成分的微胶囊

IF 2.3 4区化学

Johnson Matthey Technology Review Pub Date : 2022-01-11 DOI: 10.1595/205651322x16376750190432

İ. İvedi, Bahadır Güneşoğlu, S. Karavana, G. Kartal, G. Erkan, A. M. Sarıışık

{"title":"Using Spraying as an Alternative Method for Transferring Capsules Containing Shea Butter to Denim and Non-Denim Fabrics : Preparation of microcapsules for delivery of active ingredients","authors":"İ. İvedi, Bahadır Güneşoğlu, S. Karavana, G. Kartal, G. Erkan, A. M. Sarıışık","doi":"10.1595/205651322x16376750190432","DOIUrl":"https://doi.org/10.1595/205651322x16376750190432","url":null,"abstract":"The aim of this study was to prepare microcapsules and transfer them to denim and non-denim trousers using different application methods. For this purpose, shea butter as active agent was encapsulated in an ethyl cellulose shell using the spray dryer method, and capsule optimisation\u0000 was studied. A morphological assessment showed that the capsules had a smooth surface and were spherical in shape. The homogenous size distribution of the capsules was supported by laser diffraction analysis. The capsules showed a narrow size distribution, and the mean particle size of optimum\u0000 formulations of shea butter was 390 nm. Denim fabrics were treated with shea butter capsules using the methods of exhaustion and spraying in order to compare these application methods. The presence of capsules on the fabrics was tested after five wash cycles. The comparison of application\u0000 methods found similar preferred characteristics for both the exhaustion and spraying methods. However, the spraying method was found to be more sustainable, because it allows working with low liquor ratios in less water, with lower chemical consumption and less waste than the exhaustion method,\u0000 which requires working with a high liquor ratio. This study showed that the spraying method can be used as an alternative to other application methods in the market for reducing energy consumption, and shea butter capsules can provide moisturising properties to the fabrics.","PeriodicalId":14807,"journal":{"name":"Johnson Matthey Technology Review","volume":"1 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2022-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48729664","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1