1,720,979 research outputs found
Self-assembly of polysaccharide nanocrystals: from aggregation in suspensions to optical materials
No full texthttp://dx.doi.org/10.13039/501100001809 National Natural Science Foundation of Chinahttp://dx.doi.org/10.13039/501100002703 Jiangsu Universityhttp://dx.doi.org/10.13039/501100004543 China Scholarship Councilhttp://dx.doi.org/10.13039/501100004608 Natural Science Foundation of Jiangsu Provinc
Scalable production of carboxylated cellulose nanofibres using a green and recyclable solvent
No full textEnhanced water evaporation via coupled capillary transport and gelation in confined nanocrystal systems
No full textDrying in confined systems is a critical process with broad implications, spanning applications from materials science to water management in microscale technologies. Nevertheless, the coupled dynamics of transport and gelation in confined drying of colloidal suspensions remains poorly understood. Here cellulose nanocrystals (CNCs) are employed as a model system to systematically investigate the temporal dynamics, kinetic behavior, and structural transformation of nanocrystal suspensions during capillary drying. We report a mechanism whereby CNC suspensions, upon exceeding a critical concentration (∼1 wt%), undergo a transition from a fluid-like state to a kinetically arrested gel state at the evaporation front. This transition is accompanied by pinning of the evaporation interface at the capillary opening and leads to the formation of a gel–film heterostructure, consisting of a CNC gel layer with a water concentration gradient and a thin surface film formed via interfacial slip. This heterostructure promotes directional water transport from the capillary interior to the interface and significantly enhances the effective evaporative area, thereby accelerating the overall drying process. These findings offer insights into confinement-driven drying behavior and establish a framework for regulating evaporation kinetics in colloidal systems.Emory University http://dx.doi.org/10.13039/100006939Deutsche Forschungsgemeinschaft http://dx.doi.org/10.13039/501100001659China Scholarship Council http://dx.doi.org/10.13039/50110000454
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Electrospun Lignin/ZnO Nanofibrous Membranes for Self‐Powered Ultrasensitive Flexible Airflow Sensor and Wearable Device
No full textAbstract The interest and demand for flexible sensors and wearable devices are rapidly growing. The added benefit of electricity generation, enabling gas sensors to be self‐powered, increases the applicability of these devices for flexible and wearable airflow sensors. Inspired by water evaporation‐induced power generation, this study explores its potential in sensing applications, which has not yet been explored in detail. Electrospinning technology is used to prepare superhydrophilic lignin/ZnO nanofibrous membranes with a ZnO nanoparticle layer, capable of generating at least 100 mV (which allows it to power its own signal transduction). The membrane is highly sensitive to variations in airflow, enabling its use as an ultrasensitive and flexible airflow sensor. This sensor demonstrates exceptional performance, including a fast response time (0.65 s), broad detection range (with lower detection limit down to 0.25 and upper detection limit of 3 m s −1 ), and extremely high airflow velocity detection accuracy. Beyond these, it can serve as a wearable sensor for sweat monitoring, motion detection, and breath monitoring (to accurately detect breathing rate, intensity and variations in speech). Such self‐powered, ultrasensitive, and flexible lignin/ZnO airflow sensors provide novel potential to advance the development of smart textiles and wearable electronics.Natural Sciences and Engineering Research Council of Canada https://doi.org/10.13039/501100000038Alexander von Humboldt-Stiftung https://doi.org/10.13039/100005156Deutsche Forschungsgemeinschaft https://doi.org/10.13039/50110000165
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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