Accounts of materials research最新文献_第9页

Fast Scanning Calorimetry of Semicrystalline Polymers: From Fundamental Research to Industrial Applications 半晶聚合物的快速扫描量热法：从基础研究到工业应用

IF 14

Accounts of materials research Pub Date : 2025-04-26 DOI: 10.1021/accountsmr.5c0003110.1021/accountsmr.5c00031

Rui Zhang*, Mengxue Du, Katalee Jariyavidyanont, René Androsch*, Evgeny Zhuravlev and Christoph Schick*,

{"title":"Fast Scanning Calorimetry of Semicrystalline Polymers: From Fundamental Research to Industrial Applications","authors":"Rui Zhang*, Mengxue Du, Katalee Jariyavidyanont, René Androsch*, Evgeny Zhuravlev and Christoph Schick*, ","doi":"10.1021/accountsmr.5c0003110.1021/accountsmr.5c00031","DOIUrl":"https://doi.org/10.1021/accountsmr.5c00031https://doi.org/10.1021/accountsmr.5c00031","url":null,"abstract":"The global production of polymer products currently exceeds 400 megatons annually. To ensure effective and environmentally responsible use of this vast resource, optimizing the properties of the products is essential. Achieving this requires precise control over the internal structure of the polymers. Depending on the materials used, polymers can exist in either amorphous or semicrystalline states. Processing is often performed from the melt state, and the cooling rate plays a critical role in determining whether amorphous or semicrystalline products are formed alongside other process parameters such as the pressure and shear rates.To understand the structure formation during processing, knowledge of the cooling rate dependence is therefore essential. As all of these processes are associated with thermal effects, calorimetry is universally applicable here. Achieving cooling rates that are comparable to those during processing has therefore long been a challenge for calorimetric measurement methods. With the introduction of MEMS-based chip sensors for calorimetry, significant progress has been made in reproducing conditions, such as those that occur during injection molding. These special calorimetric techniques are often summarized under the terms Fast Scanning Calorimetry (FSC) or Nanocalorimetry, alluding to nanogram samples.Investigations with controlled cooling rates of up to 1 × 106 K/s are now possible with special chip sensors and allow the study of material properties under extreme conditions. Technological issues such as crystallization and nucleation processes under process-relevant conditions can be investigated in most cases with commercial devices that achieve cooling rates of 104 K/s. The cooling rates to be considered in relation to various manufacturing processes are discussed here, and the functionality of corresponding chip calorimeters is briefly presented.Since calorimetry only provides general information on the processes taking place in the material, but not directly on the resulting structures, combinations of FSC and methods for structure elucidation, e.g., microscopy, are also presented. The main part of this Account deals with contributions of FSC to the understanding of crystallization processes under conditions as they occur in different manufacturing processes. Not only the influence of the cooling rate during injection molding but also the multistage cooling by chill rolls during film production is considered.Thanks to the high scanning rate of FSC, needed to bypass crystallization in the low-supercooling temperature range where heterogeneous nucleation dominates, an important aspect of polymer structure formation─homogeneous crystal nucleation─has become accessible for direct observation. Homogeneous nucleation can occur not only during cooling but also during storage at temperatures close to or even below the glass transition temperature in the amorphous st","PeriodicalId":72040,"journal":{"name":"Accounts of materials research","volume":"6 5","pages":"627–637 627–637"},"PeriodicalIF":14.0,"publicationDate":"2025-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144114622","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fast Scanning Calorimetry of Semicrystalline Polymers: From Fundamental Research to Industrial Applications 半晶聚合物的快速扫描量热法：从基础研究到工业应用

Accounts of materials research Pub Date : 2025-04-26 DOI: 10.1021/accountsmr.5c00031

Rui Zhang, Mengxue Du, Katalee Jariyavidyanont, René Androsch, Evgeny Zhuravlev, Christoph Schick

引用次数: 0

IF 14

Accounts of materials research Pub Date : 2025-04-25

Cheng Chen, Yiding Wang, Jie Hou* and Jun Song*,

引用次数: 0

Synthesis of Homogeneous Plasmonic Nanostructures for Generating Uniform and Reproducible Photonic Environments 合成均匀等离子体纳米结构以产生均匀和可复制的光子环境

IF 14.7

Accounts of materials research Pub Date : 2025-04-25 DOI: 10.1021/accountsmr.5c00043

Yoonhee Kim, Yuna Kwak, Jihyeon Choi and Jwa-Min Nam*,

{"title":"Synthesis of Homogeneous Plasmonic Nanostructures for Generating Uniform and Reproducible Photonic Environments","authors":"Yoonhee Kim, Yuna Kwak, Jihyeon Choi and Jwa-Min Nam*, ","doi":"10.1021/accountsmr.5c00043","DOIUrl":"10.1021/accountsmr.5c00043","url":null,"abstract":"The preserved bosonic nature of surface plasmon polaritons from incident photons allows plasmonic nanomaterials to serve as effective photonic platforms. The strong light–matter interaction occurring at the surface concentrates light energy within a narrow region, thereby altering the local density of optical states. This modified photonic environment is typically expressed as near-field enhancement and improves the transition probability of nearby molecules or quantum emitters. However, despite the potential of plasmonic nanostructures to act as signal-transducers, issues in generating reproducible and consistent photonic responses with these platforms hinder their wide use for practical applications. As the parameters of plasmonic modulation are highly sensitive to even minor differences in surface morphology, a key origin of fluctuation in optical responses is the physical heterogeneity of the constituent nanostructures themselves. Therefore, although statistical and analytical techniques can obtain optically consistent signals from plasmonic nanostructures, the necessity of synthesizing uniform plasmonic nanostructures to achieve identical optical signals is becoming ever-more evident.This Account focuses on synthetic approaches to ensure structural uniformity of plasmonic nanostructures, which in turn produces precisely tunable and reproducible optical signals. The discussion begins with methods to realize monodispersity in simple forms of plasmonic nanostructures whose geometric homogeneity can be acquired during the nucleation and growth stages of synthesis. As heterogeneous nanoparticles of different shapes and their corresponding nonuniform plasmonic responses originate primarily from differences in seed crystallinity, nucleation─the point at which the crystallinity of the nanoparticle emerges─plays a crucial role. By gaining an understanding of how reduction rate, surface ligands, and etching control the formation of seeds with different crystallographic structures, strategies for obtaining homogeneous seed structures are explained. This is followed by discussions about the growth stage where the final morphology of nanostructures is determined. The main task of this subsequent growth stage is the preservation of initial crystallinity by balancing the interplay between deposition and surface diffusion. Lastly, shape-selective purification strategies are investigated, particularly depletion-induced flocculation, as they remove impurities and improve overall yields.Meanwhile, the advanced functionality of plasmonic nanostructures has been achieved through the synthesis of more complex architectures. Accordingly, this Account then discusses approaches using the monodisperse basic nanostructures as building blocks, either by acting as templates on which secondary structures can be grown or by their self-assembly into multidimensional superlattices. Template synthesis maintains the uniformity of initial structures while e","PeriodicalId":72040,"journal":{"name":"Accounts of materials research","volume":"6 6","pages":"742–753"},"PeriodicalIF":14.7,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143876242","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

IF 14

Accounts of materials research Pub Date : 2025-04-25

Yuqing Luo, Junmei Chen, Na Han and Yanguang Li*,

引用次数: 0

IF 14

Accounts of materials research Pub Date : 2025-04-25

Jiangyu Zhu, Rong Zhang, Dongyue An, Yuanhe Gu, Xuefeng Lu* and Yunqi Liu*,

引用次数: 0

IF 14

Accounts of materials research Pub Date : 2025-04-25

Ai-Yong Zhang, Chang Liu and Han-Qing Yu*,