scholarly journals Chiroptical Sensing: A Conceptual Introduction

Sensors ◽  
2020 ◽  
Vol 20 (4) ◽  
pp. 974 ◽  
Author(s):  
Ani Ozcelik ◽  
Raquel Pereira-Cameselle ◽  
Natasa Poklar Ulrih ◽  
Ana G. Petrovic ◽  
José Lorenzo Alonso-Gómez
Keyword(s):  
Intermolecular Interactions ◽  
Rational Design ◽  
Review Article ◽  
Structural Elucidation ◽  
Sensing Applications ◽  
Theoretical Approaches ◽  
Essential Tool ◽  
Made In

Chiroptical responses have been an essential tool over the last decades for chemical structural elucidation due to their exceptional sensitivity to geometry and intermolecular interactions. In recent times, there has been an increasing interest in the search for more efficient sensing by the rational design of tailored chiroptical systems. In this review article, advances made in chiroptical systems towards their implementation in sensing applications are summarized. Strategies to generate chiroptical responses are illustrated. Theoretical approaches to assist in the design of these systems are discussed. The development of efficient chiroptical reporters in different states of matter, essential for the implementation in sensing devises, is reviewed. In the last part, remarkable examples of chiroptical sensing applications are highlighted.

scholarly journals Chiroptical Sensing

2019 ◽  
Author(s):  
Ani Ozcelik ◽  
Raquel Pereira-Cameselle ◽  
Nataša Poklar Ulrih ◽  
Ana G. Petrovic ◽  
José Lorenzo Alonso-Gómez
Keyword(s):  
Intermolecular Interactions ◽  
Rational Design ◽  
Review Article ◽  
Structural Elucidation ◽  
Sensing Applications ◽  
Theoretical Approaches ◽  
Essential Tool

Chiroptical responses have been an essential tool over the last decades for chemical structural elucidation due to their exceptional sensitivity to geometry and intermolecular interactions. In recent times, there has been an increasing interest for the search of more efficient sensing by the rational design of tailored chiroptical systems. In this Review article, advances on chiroptical systems towards their implementation in sensing applications are summarized. Strategies to generate chiroptical responses are illustrated. Theoretical approaches to assist in the design of these systems are discussed. Development of efficient chiroptical reporters in different states of matter, essential for the implementation in sensing devises, is reviewed. In the last part, remarkable examples of chiroptical sensing applications are highlighted.

DNA Inspirited Rational Construction of Nonconventional Luminophores with Efficient and Color-Tunable Afterglow

2020 ◽  
Author(s):  
Yunzhong Wang ◽  
Saixing Tang ◽  
Yating Wen ◽  
Shuyuan Zheng ◽  
Bing Yang ◽  
...  
Keyword(s):  
Rational Design ◽  
Room Temperature ◽  
Double Helix ◽  
Mechanical Grinding ◽  
Room Temperature Phosphorescence ◽  
Color Tunable ◽  
Potential Applications ◽  
Rational Construction ◽  
Double Helix Structure ◽  
Made In

<div>Persistent room-temperature phosphorescence (p-RTP) from pure organics is attractive </div><div>due to its fundamental importance and potential applications in molecular imaging, </div><div>sensing, encryption, anticounterfeiting, etc.1-4 Recently, efforts have been also made in </div><div>obtaining color-tunable p-RTP in aromatic phosphors5 and nonconjugated polymers6,7. </div><div>The origin of color-tunable p-RTP and the rational design of such luminogens, </div><div>particularly those with explicit structure and molecular packing, remain challenging. </div><div>Noteworthily, nonconventional luminophores without significant conjugations generally </div><div>possess excitation-dependent photoluminescence (PL) because of the coexistence of </div><div>diverse clustered chromophores6,8, which strongly implicates the possibility to achieve </div><div>color-tunable p-RTP from their molecular crystals assisted by effective intermolecular </div><div>interactions. Here, inspirited by the highly stable double-helix structure and multiple </div><div>hydrogen bonds in DNA, we reported a series of nonconventional luminophores based on </div><div>hydantoin (HA), which demonstrate excitation-dependent PL and color-tunable p-RTP </div><div>from sky-blue to yellowish-green, accompanying unprecedentedly high PL and p-RTP </div><div>efficiencies of up to 87.5% and 21.8%, respectively. Meanwhile, the p-RTP emissions are </div><div>resistant to vigorous mechanical grinding, with lifetimes of up to 1.74 s. Such robust, </div><div>color-tunable and highly efficient p-RTP render the luminophores promising for varying </div><div>applications. These findings provide mechanism insights into the origin of color-tunable </div><div>p-RTP, and surely advance the exploitation of efficient nonconventional luminophores.</div>

scholarly journals Optimization of a Low-Power Chemoresistive Gas Sensor: Predictive Thermal Modelling and Mechanical Failure Analysis

Sensors ◽  
2021 ◽  
Vol 21 (3) ◽  
pp. 783 ◽  
Author(s):  
Andrea Gaiardo ◽  
David Novel ◽  
Elia Scattolo ◽  
Michele Crivellari ◽  
Antonino Picciotto ◽  
...  
Keyword(s):  
Low Power ◽  
Failure Analysis ◽  
Gas Sensors ◽  
High Performance ◽  
Gas Sensing ◽  
Mechanical Failure ◽  
Sensing Applications ◽  
Theoretical Approaches ◽  
Sensing Material ◽  
Silicon Bulk

The substrate plays a key role in chemoresistive gas sensors. It acts as mechanical support for the sensing material, hosts the heating element and, also, aids the sensing material in signal transduction. In recent years, a significant improvement in the substrate production process has been achieved, thanks to the advances in micro- and nanofabrication for micro-electro-mechanical system (MEMS) technologies. In addition, the use of innovative materials and smaller low-power consumption silicon microheaters led to the development of high-performance gas sensors. Various heater layouts were investigated to optimize the temperature distribution on the membrane, and a suspended membrane configuration was exploited to avoid heat loss by conduction through the silicon bulk. However, there is a lack of comprehensive studies focused on predictive models for the optimization of the thermal and mechanical properties of a microheater. In this work, three microheater layouts in three membrane sizes were developed using the microfabrication process. The performance of these devices was evaluated to predict their thermal and mechanical behaviors by using both experimental and theoretical approaches. Finally, a statistical method was employed to cross-correlate the thermal predictive model and the mechanical failure analysis, aiming at microheater design optimization for gas-sensing applications.

scholarly journals Rational design of photocatalysts for ammonia production from water and nitrogen gas

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Seokwoo Choe ◽  
Sung Min Kim ◽  
Yeji Lee ◽  
Jin Seok ◽  
Jiyong Jung ◽  
...  
Keyword(s):  
Energy Source ◽  
Rational Design ◽  
Future Research ◽  
Ammonia Production ◽  
Significant Progress ◽  
Nitrogen Gas ◽  
Research Directions ◽  
Effective Strategies ◽  
Future Research Directions ◽  
Made In

AbstractPhotocatalytic N2 reduction has emerged as one of the most attractive routes to produce NH3 as a useful commodity for chemicals used in industries and as a carbon-free energy source. Recently, significant progress has been made in understanding, exploring, and designing efficient photocatalyst. In this review, we outline the important mechanistic and experimental procedures for photocatalytic NH3 production. In addition, we review effective strategies on development of photocatalysts. Finally, our analyses on the characteristics and modifications of photocatalysts have been summarized, based on which we discuss the possible future research directions, particularly on preparing more efficient catalysts. Overall, this review provides insights on improving photocatalytic NH3 production and designing solar-driven chemical conversions.

scholarly journals Anisotropic, Wrinkled, and Crack-Bridging Structure for Ultrasensitive, Highly Selective Multidirectional Strain Sensors

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Heng Zhang ◽  
Dan Liu ◽  
Jeng-Hun Lee ◽  
Haomin Chen ◽  
Eunyoung Kim ◽  
...  
Keyword(s):  
Rational Design ◽  
Full Range ◽  
Human Motion ◽  
Strain Sensors ◽  
Gauge Factor ◽  
Wearable Electronics ◽  
Trade Off ◽  
Human Motion Detection ◽  
Sensing Applications ◽  
Anisotropic Structures

AbstractFlexible multidirectional strain sensors are crucial to accurately determining the complex strain states involved in emerging sensing applications. Although considerable efforts have been made to construct anisotropic structures for improved selective sensing capabilities, existing anisotropic sensors suffer from a trade-off between high sensitivity and high stretchability with acceptable linearity. Here, an ultrasensitive, highly selective multidirectional sensor is developed by rational design of functionally different anisotropic layers. The bilayer sensor consists of an aligned carbon nanotube (CNT) array assembled on top of a periodically wrinkled and cracked CNT–graphene oxide film. The transversely aligned CNT layer bridge the underlying longitudinal microcracks to effectively discourage their propagation even when highly stretched, leading to superior sensitivity with a gauge factor of 287.6 across a broad linear working range of up to 100% strain. The wrinkles generated through a pre-straining/releasing routine in the direction transverse to CNT alignment is responsible for exceptional selectivity of 6.3, to the benefit of accurate detection of loading directions by the multidirectional sensor. This work proposes a unique approach to leveraging the inherent merits of two cross-influential anisotropic structures to resolve the trade-off among sensitivity, selectivity, and stretchability, demonstrating promising applications in full-range, multi-axis human motion detection for wearable electronics and smart robotics.

Corporate hypocrisy

2021 ◽  
Author(s):  
Manuel Alfonso Garzón Castrillón
Keyword(s):  
Two Dimensions ◽  
Review Article ◽  
Moral Hypocrisy ◽  
Brand Reputation ◽  
Short And Long Term ◽  
Corporate Social ◽  
Temporal Direction ◽  
Practical Implications ◽  
Made In

This review article aimed to contribute to the understanding of the importance of coherence between saying and acting to prevent companies from being perceived from the perspective of business hypocrisy and affecting the brand, reputation, trust and credibility in the company. It was carried out based on the Methodi Ordinatio, addressing its theoretical origins and then approaching the concept, later venturing into the different studies that have approached it from corporate social responsibility (CSR), ethics; reputation, interest groups (stakeholders), and communication, subsequently in relation to the consequences that it generates in world-known organizations, their statements and the criticism made, subsequently an analysis of three aspects or facets is made in which it is presented namely: moral hypocrisy; behavioral hypocrisy and how to attribute business hypocrisy, the next point presents a typology that involves two dimensions: an orientation that refers to the attention span, in the short and long term of participants when making or responding to accusations of hypocrisy and a temporal direction, which refers to the point of comparison, past or future, finally reaches some conclusions, and some practical implications.

scholarly journals History of Contemporary Cultural Psychiatry in Iran

2021 ◽  
Vol 26 (4) ◽  
pp. 524-533
Author(s):  
Ruohollah Seddigh ◽  
◽  
Somayeh Azarnik ◽  
Keyword(s):  
Psychiatric Disorders ◽  
Review Article ◽  
Narrative Review ◽  
Educational Resources ◽  
Cultural Psychiatry ◽  
History Of ◽  
Made In

Cultural psychiatry is one of the relatively new trends in psychiatry that has received much attention today. During the last century, many Iranian psychiatrists have taken steps to introduce various aspects of cultural psychiatry from the field of epidemiology to the cultural conceptualization of psychiatric disorders. This narrative review article tries to refer to the history of contemporary cultural psychiatry and the efforts have been made in this field by Iranian psychiatrists between 1936 and 2019. It seems that the introduction of these efforts as educational resources to residents and students can help to further explain and develop this area and a deeper understanding of psychiatric disorders. However, there are still shortcomings in documenting, compiling, and integrating these services, which require special attention from researchers in this field.

scholarly journals Clinical and Neurobiological Aspects of TAO Kinase Family in Neurodevelopmental Disorders

2021 ◽  
Vol 14 ◽  
Author(s):  
Chun Hu ◽  
Pan Feng ◽  
Qian Yang ◽  
Lin Xiao
Keyword(s):  
Neurodevelopmental Disorders ◽  
Basic Research ◽  
Genetic Data ◽  
Review Article ◽  
Biological Processes ◽  
Behavioral Impairment ◽  
Clinical Investigations ◽  
Substantial Progress ◽  
Biochemical Analyses ◽  
Made In

Despite the complexity of neurodevelopmental disorders (NDDs), from their genotype to phenotype, in the last few decades substantial progress has been made in understanding their pathophysiology. Recent accumulating evidence shows the relevance of genetic variants in thousand and one (TAO) kinases as major contributors to several NDDs. Although it is well-known that TAO kinases are a highly conserved family of STE20 kinase and play important roles in multiple biological processes, the emerging roles of TAO kinases in neurodevelopment and NDDs have yet to be intensively discussed. In this review article, we summarize the potential roles of the TAO kinases based on structural and biochemical analyses, present the genetic data from clinical investigations, and assess the mechanistic link between the mutations of TAO kinases, neuropathology, and behavioral impairment in NDDs. We then offer potential perspectives from basic research to clinical therapies, which may contribute to fully understanding how TAO kinases are involved in NDDs.

The state of the field and debates on ethnic cleansing

2018 ◽  
Vol 46 (6) ◽  
pp. 1136-1145
Author(s):  
H. Zeynep Bulutgil
Keyword(s):  
Review Article ◽  
The State ◽  
Ethnic Cleansing ◽  
Mass Violence ◽  
Strategic Environments ◽  
Made In ◽  
State Of The Field

This review article outlines the progress that the literature on the causes of ethnic cleansing has made in the last 10–15 years. The article specifically focuses on two lines of research that have expanded our understanding of ethnic cleansing: (a) the studies that focus on the role of wars (this literature can in turn be divided into those works that treat “wars as strategic environments” and those that treat “wars as transformational forces”); (b) the studies that focus on the pre-war domestic or international conditions that hinder or promote ethnic cleansing. The last section of the article suggests several future avenues of research that could further refine the study of ethnic cleansing and its relationship to other types of mass violence.

Sign in / Sign up

Export Citation Format

Share Document