scholarly journals Design and Manufacturing of an Innovative Triple-Layer Thermo-Insulated Fabric

2020 ◽  
Vol 10 (2) ◽  
pp. 680
Author(s):  
Rocco Furferi ◽  
Franco Mantellassi ◽  
Yary Volpe
Keyword(s):  
Thermal Insulation ◽  
Textile Industry ◽  
State Of The Art ◽  
New Horizons ◽  
New Class ◽  
Triple Layer ◽  
Important Improvement ◽  
Synthetic Materials ◽  
Design And Manufacturing ◽  
Materials Used

Materials used for creating fabrics featuring insulation and thermoregulation are typically made of multi-layer materials consisting of two outer layers and inner padding, traditionally made from goose or duck feathers or even with synthetic materials. In this context, the development of a fabric in which the insulation is carried out directly thanks to the structure of its weave, i.e., where the thermoregulation function is entrusted to one of the yarns (suitably volumized to reduce its density and trap the air) may be an important improvement compared to the state of the art. Accordingly, the present work describes the development of a new kind of triple-layer thermo-insulated innovative fabric (named T4Innovation), in which the thermal insulation is not obtained by means of a padding but rather through the use of appropriate volumized yarns, able to ensure thermal insulation in a reduced thickness. This fabric is manufactured in a single weaving phase, greatly facilitating the subsequent operations of the garment maker. The designed and manufactured fabric was extensively tested to assess its performance. The test demonstrated the effectiveness of such a new class of textile product in terms of thermal performance, which is comparable to the ones of a padded material. Since T4Innovation demonstrates aesthetic properties very close to that of traditional unpadded fabrics, its future commercialization could open new horizons in terms of design, fashion, and style, which are cornerstones of the fashion textile industry.

Development of Hybrid Cellulose Bio Nanocomposite From Banana and Jute Fiber

2017 ◽  
pp. 361-379 ◽  
Author(s):  
Ayush Rathore ◽  
Mohan Kumar Pradhan
Keyword(s):  
Natural Fiber ◽  
Value Added ◽  
Jute Fiber ◽  
The Sustainable Development ◽  
New Class ◽  
Synthetic Materials ◽  
Ecological Changes ◽  
Major Disadvantage ◽  
New Material ◽  
Materials Used

In the era of globalization and industrialization the concern is limited only in development, without taking the environment into consideration this leads to global warming and big ecological changes in recent year. The material like Synthetic materials used in many applications due to ease of fabrication and higher strength, but the major disadvantage with it is, its neither recyclable nor bio-degradable. Therefore, the researchers develop a new material and technique for the sustainable development. A lot of researches were carried out in the reinforcing potential in the polymer matrix composite, reinforcing can be of two kinds synthetic and natural fiber. Natural fiber is gaining importance in the last decade due to its ecofriendly nature and does not leave carbon foot print, for better utilization of banana and jute fiber for making value added products. Hence, in this work the objective is to develop a new class of hybrid nano-materials from natural fiber such as banana and jute fiber. This chapter sees an opportunity of enhancement of interface property.

scholarly journals Environmentally Friendly, High-Performance Fire Retardant Made from Cellulose and Graphite

Polymers ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2400
Author(s):  
Leandra P. Santos ◽  
Douglas S. da Silva ◽  
Thais H. Morari ◽  
Fernando Galembeck
Keyword(s):  
High Performance ◽  
Raw Materials ◽  
Fire Retardant ◽  
Visual Observation ◽  
Flame Resistance ◽  
New Developments ◽  
New Class ◽  
New Material ◽  
Accredited Laboratory ◽  
Materials Used

Many materials and additives perform well as fire retardants and suppressants, but there is an ever-growing list of unfulfilled demands requiring new developments. This work explores the outstanding dispersant and adhesive performances of cellulose to create a new effective fire-retardant: exfoliated and reassembled graphite (ERG). This is a new 2D polyfunctional material formed by drying aqueous dispersions of graphite and cellulose on wood, canvas, and other lignocellulosic materials, thus producing adherent layers that reduce the damage caused by a flame to the substrates. Visual observation, thermal images and surface temperature measurements reveal fast heat transfer away from the flamed spots, suppressing flare formation. Pinewood coated with ERG underwent standard flame resistance tests in an accredited laboratory, reaching the highest possible class for combustible substrates. The fire-retardant performance of ERG derives from its thermal stability in air and from its ability to transfer heat to the environment, by conduction and radiation. This new material may thus lead a new class of flame-retardant coatings based on a hitherto unexplored mechanism for fire retardation and showing several technical advantages: the precursor dispersions are water-based, the raw materials used are commodities, and the production process can be performed on commonly used equipment with minimal waste.

scholarly journals Optimum Thickness of Thermal Insulation with Both Economic and Ecological Costs of Heating and Cooling

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3835
Author(s):  
Robert Dylewski ◽  
Janusz Adamczyk
Keyword(s):  
Thermal Insulation ◽  
Construction Materials ◽  
Optimum Thickness ◽  
Degree Days ◽  
Transfer Coefficients ◽  
Cooling Period ◽  
Heating And Cooling ◽  
Optimum Heat ◽  
Materials Used ◽  
Building Walls

The energy efficiency of the construction sector should be determined by the cleanliness of the environment and, thus, the health of society. The scientific aim of this article was to develop a methodology for determining the optimum thickness of thermal insulation, taking into account both economic and ecological aspects and considering both heating and cooling costs. The method takes into account the number of degree days of the heating period, as well as the number of degree days of the cooling period. Variants in terms of different types of thermal insulation, various types of construction materials for building walls, climatic zones and heat sources, were taken into consideration. In order to find the optimum thicknesses of thermal insulation, both in economic and ecological terms, a metacriterion was used. The optimum thicknesses of thermal insulation with the use of the metacriterion were obtained in the range of 0.11–0.55 m. It was observed that the values of the optimum heat transfer coefficients for economic and ecological reasons do not depend on the type of construction materials used for vertical walls. The type of applied heat source is of the greatest importance for the size of the economic and ecological benefits. The proposed mathematical model for determining the optimum thickness of thermal insulation with the use of a metacriterion is a kind of generalization of earlier models from the literature.

scholarly journals Bitkilerde Bulunan Fitokimyasalların Biyolojik Aktiviteleri

2020 ◽  
Vol 8 (8) ◽  
pp. 1734-1746
Author(s):  
Tuğba Demir ◽  
Özlem Akpınar
Keyword(s):  
Secondary Metabolites ◽  
Chronic Diseases ◽  
Bioactive Compounds ◽  
Biological Activities ◽  
Beneficial Effects ◽  
Synthetic Materials ◽  
Effective Role ◽  
Materials Used ◽  
Antihypertensive Properties

Bioactive compounds, called phytochemicals, are produced as secondary metabolites in plants that have beneficial effects on health when they are consumed as nutrients. Phytochemicals have an effective role in the formation of the color, smell and taste of the plants. As an alternative to the synthetic materials used in the treatment of many chronic diseases, the interest in the use of plants phytochemicals have been increased. This trend has led to the development of a new market. This review includes biological activities of plant phytochemicals including antioxidant, antimicrobial, antifungal, antidiabetic, antiinflammatory, anticancer and antihypertensive properties.

Development of high-insulating materials with aerogel for protective clothing applications – an overview

2021 ◽  
Vol 112 (2) ◽  
pp. 164-172
Author(s):  
Agnieszka Greszta ◽  
Sylwia Krzemińska ◽  
Grażyna Bartkowiak ◽  
Anna Dąbrowska
Keyword(s):  
Thermal Conductivity ◽  
Thermal Insulation ◽  
Protective Clothing ◽  
State Of The Art ◽  
Knitted Fabrics ◽  
Insulating Materials ◽  
Textile Materials ◽  
Wide Range ◽  
Properties Of Materials ◽  
Hot Environments

Abstract Aerogels are ultra-light solids with extremely low thermal conductivity (even lower than air), thanks to which they have a huge potential in a wide range of applications. The purpose of this publication is to present the state-of-the art knowledge of the possibility of using aerogels to increase the thermal insulation properties of clothing materials intended for use in both cold and hot environments. Various methods of aerogels application to textile materials (non-woven, woven and knitted fabrics) are discussed, indicating their advantages and limitations. Numerous research studies confirm that aerogels significantly improve the thermal insulation properties of materials, but due to their delicate and brittle structure and their tendency to dusting, their application still poses considerable problems.

Ensuring energy efficiency of refrigeration piping

2021 ◽  
pp. 45-52
Author(s):  
G.I. Petrov ◽  
V.N. Kornienko ◽  
A.G. Donetskikh
Keyword(s):  
Energy Efficiency ◽  
Comparative Analysis ◽  
Thermal Insulation ◽  
Raw Materials ◽  
Thermal Characteristics ◽  
Operational Reliability ◽  
Insulating Materials ◽  
Insulation Materials ◽  
Synthetic Rubber ◽  
Materials Used

Improving energy efficiency and energy saving in refrigeration technology depends largely on the use of modern thermal insulation materials in the thermal insulation structures of refrigeration pipelines. The article presents a comparative analysis of the thermal characteristics and operational properties of heat-insulating materials used in refrigeration. The features of RUFLEX thermal insulation materials based on foamed synthetic rubber produced from domestic raw materials and their compliance with the requirements of energy efficiency, durability, operational reliability and safety are considered.

Solid Electrolytic Capacitors Designed for High Temperature Applications

2015 ◽  
Vol 2015 (HiTEN) ◽  
pp. 000142-000152 ◽  
Author(s):  
Randy Hahn ◽  
Kristin Tempel
Keyword(s):  
High Temperature ◽  
Operating Temperature ◽  
Tantalum Pentoxide ◽  
Passive Component ◽  
Surface Mount ◽  
Electrolytic Capacitors ◽  
Developed Surface ◽  
Design And Manufacturing ◽  
Materials Used ◽  
Temperature Applications

For decades the maximum recommended operating temperature of solid electrolytic capacitors was 125°C. Responding to needs in the automotive and downhole drilling industries passive component manufacturers developed surface mount tantalum capacitors rated at 150°C in 2002–2003. Since that time the industry has introduced high temperature capable tantalum capacitors generally in 25°C increments roughly every four years. Today multiple manufacturers have products rated at 230°C poised for market release. The tantalum anode, tantalum pentoxide dielectric and manganese dioxide primary cathode material stand up well to these temperatures, although some optimization of the design and manufacturing process for these materials have been required. The primary challenges encountered when developing solid electrolytic capacitors with high temperature capabilities are associated with the carbon, silver and epoxy encapsulant materials used in conventional surface mount tantalum capacitors. Capacitor manufacturers have taken different paths to overcome these challenges. We have developed a metallized plating process to avoid issues associated with silver paints utilized in conventional Ta capacitors. We have worked with suppliers, or developed in house capabilities, to manufacture the other materials required to withstand the rigors of high temperature applications. This paper will discuss these challenges and provide reliability test data on a recently developed tantalum surface mount series capable of continuous operation at 230°C.

scholarly journals Sperm Cell Driven Microrobots—Emerging Opportunities and Challenges for Biologically Inspired Robotic Design

Micromachines ◽  
2020 ◽  
Vol 11 (4) ◽  
pp. 448 ◽  
Author(s):  
Ajay Singh ◽  
Mohammad Ansari ◽  
Mihir Mahajan ◽  
Shubhangi Srivastava ◽  
Shubham Kashyap ◽  
...  
Keyword(s):  
Targeted Drug Delivery ◽  
State Of The Art ◽  
Cell Manipulation ◽  
Small Scale ◽  
Sperm Cells ◽  
Biologically Inspired ◽  
New Class ◽  
Targeted Drug ◽  
New Applications ◽  
Coupling Mechanisms

With the advent of small-scale robotics, several exciting new applications like Targeted Drug Delivery, single cell manipulation and so forth, are being discussed. However, some challenges remain to be overcome before any such technology becomes medically usable; among which propulsion and biocompatibility are the main challenges. Propulsion at micro-scale where the Reynolds number is very low is difficult. To overcome this, nature has developed flagella which have evolved over millions of years to work as a micromotor. Among the microscopic cells that exhibit this mode of propulsion, sperm cells are considered to be fast paced. Here, we give a brief review of the state-of-the-art of Spermbots—a new class of microrobots created by coupling sperm cells to mechanical loads. Spermbots utilize the flagellar movement of the sperm cells for propulsion and as such do not require any toxic fuel in their environment. They are also naturally biocompatible and show considerable speed of motion thereby giving us an option to overcome the two challenges of propulsion and biocompatibility. The coupling mechanisms of physical load to the sperm cells are discussed along with the advantages and challenges associated with the spermbot. A few most promising applications of spermbots are also discussed in detail. A brief discussion of the future outlook of this extremely promising category of microrobots is given at the end.

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