scholarly journals High efficiency Mg2(Si,Sn)-based thermoelectric materials: scale-up synthesis, functional homogeneity, and thermal stability

RSC Advances ◽  
2019 ◽  
Vol 9 (40) ◽  
pp. 23021-23028 ◽  
Author(s):  
Nader Farahi ◽  
Christian Stiewe ◽  
D. Y. Nhi Truong ◽  
Johannes de Boor ◽  
Eckhard Müller
Keyword(s):  
Thermal Stability ◽  
Thermoelectric Materials ◽  
High Performance ◽  
High Efficiency ◽  
Scale Up ◽  
Synthesis Method ◽  
Industrial Applications ◽  
Magnesium Silicide ◽  
Functional Homogeneity ◽  
Scalable Synthesis

Considering the need for large quantities of high efficiency thermoelectric materials for industrial applications, a scalable synthesis method for high performance magnesium silicide based materials is proposed.

scholarly journals High-performance La-doped BCZT thin film capacitors on LaNiO3/Pt composite bottom electrodes with ultra-high efficiency and high thermal stability

2019 ◽  
Vol 45 (9) ◽  
pp. 11749-11755 ◽  
Author(s):  
Shangkai He ◽  
Biaolin Peng ◽  
Glenn J.T. Leighton ◽  
Christopher Shaw ◽  
Ningzhang Wang ◽  
...  
Keyword(s):  
Thin Film ◽  
Thermal Stability ◽  
High Performance ◽  
High Efficiency ◽  
High Thermal Stability ◽  
Thin Film Capacitors ◽  
La Doped

Large Scale Solid State Synthetic Technique for High Performance Thermoelectric Materials: Magnesium-Silicide-Stannide

2020 ◽  
Vol 3 (3) ◽  
pp. 2130-2136
Author(s):  
Daniel C. Ramirez ◽  
Leilane R. Macario ◽  
Xiaoyu Cheng ◽  
Michael Cino ◽  
Daniel Walsh ◽  
...  
Keyword(s):  
Solid State ◽  
Thermoelectric Materials ◽  
High Performance ◽  
Large Scale ◽  
Magnesium Silicide

Review of Sliding Mode Observers for Sensorless Control of Permanent Magnet Synchronous Motor Drives

2018 ◽  
Vol 9 (1) ◽  
pp. 46
Author(s):  
Ganapathy Ram ◽  
Santha K R
Keyword(s):  
Permanent Magnet ◽  
High Performance ◽  
High Efficiency ◽  
Position Control ◽  
Sliding Mode ◽  
Sensorless Control ◽  
Low Cost ◽  
Permanent Magnet Synchronous Motor ◽  
Industrial Applications ◽  
Hardware Complexity

Permanent magnet synchronous motors (PMSMs) are increasingly used in high performance variable speed drives of many industrial applications. PMSM has many features, like high efficiency, compactness, high torque to inertia ratio, rapid dynamic response, simple modeling and control, and maintenance free operation. Presence of position sensors presents several disadvantages, such as reduced reliability, susceptibility to noise, additional cost and weight and increased complexity of the drive system. For these reasons, the development of alternative indirect methods for speed and position control becomes an important research topic. Advantages of sensorless control are reduced hardware complexity, low cost, reduced size, cable elimination, increased noise immunity, increased reliability and decreased maintenance. The key problem in sensorless vector control of ac drives is the accurate dynamic estimation of the stator flux vector over a wide speed range using only terminal variables (currents and voltages). The difficulty comprises state estimation at very low speeds where the fundamental excitation is low and the observer performance tends to be poor. Moreover, the noises of system and measurements are considered other main problems. This paper presents a comprehensive study of the different sliding mode observer methods of speed and position estimations for sensorless control of PMSM drives.

Evaluation of thermo-mechanical, dielectric and corrosion resistant properties of cardanol benzoxazine-epoxy based hybrid composites: A very low temperature curing pre-polymer for high performance paint related applications

2019 ◽  
Vol 32 (5) ◽  
pp. 524-539 ◽  
Author(s):  
V Selvaraj ◽  
TR Raghavarshini ◽  
M Alagar
Keyword(s):  
Thermal Stability ◽  
Low Temperature ◽  
High Performance ◽  
Hybrid Composites ◽  
Industrial Applications ◽  
Curing Temperature ◽  
Polymerization Temperature ◽  
Corrosion Resistant ◽  
The Matrix ◽  
Ep Matrix

In the present work, the hybrid siloxane-based cardanol-benzoxazine-epoxy (1:1 ratio) matrix (SBCBz-EP) capable of curing at substantially low temperature when compared with that of conventional benzoxazines was prepared and characterized. The matrix SBCBz-EP was reinforced with varying weight percentages (1, 3 and 5 wt%) of hydroxyl-terminated cyclotriphosphazene (HTCP) and the resulting hybrid composites were characterized by modern analytical methods, which can be used for paint-related applications due to their low-temperature curing behaviour. Data obtained from differential scanning calorimeter analysis infer that the glass transition temperature of the hybrid matrix (SBCBz-EP) and HTCP reinforced with 1, 3 and 5 wt% composites was 73°C, 75°C, 82°C, and 88°C, respectively. The polymerization temperature obtained for SBCBz-EP matrix and HTCP-reinforced hybrid composites was considerably lower than that of conventional benzoxazines. The present hybridization approach of benzoxazine and epoxy paves an avenue to alleviate the deficient characteristics of both industrially valuable resins namely high curing temperature and brittle behaviour of benzoxazines and also to improve thermal stability, mechanical strength and flame-retardant behaviour of epoxy resins. Data obtained from mechanical, dielectric, thermal stability and corrosion-resistant studies indicate that the properties of hybrid composites (HTCP/SBCBZ-EP) were enhanced to an appreciable extent according to the wt% of HTCP and it can be suggested that these hybrid composite materials can be used in the form of adhesives, sealants, encapsulants and water-resistant coatings for high performance industrial applications.

A scalable synthesis of ternary nanocatalysts for a high-efficiency electrooxidation catalysis by microfluidics

Nanoscale ◽  
2020 ◽  
Vol 12 (23) ◽  
pp. 12647-12654
Author(s):  
Yingyan Zhou ◽  
Dumei Wang ◽  
Xueming Kang ◽  
Dongtang Zhang ◽  
Xiangnan Dou ◽  
...  
Keyword(s):  
Continuous Flow ◽  
High Efficiency ◽  
Scale Up ◽  
High Dispersion ◽  
Nanomaterials Synthesis ◽  
Scalable Synthesis

An array-channel continuous flow scale-up strategy based on a microchip for high dispersion of loaded PtFeCu/C nanocatalysts for nanomaterials’ synthesis is reported.

scholarly journals The Synthesis of Mannose-6-Phosphate Using Polyphosphate-Dependent Mannose Kinase

Catalysts ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 250
Author(s):  
Wenlong Zhu ◽  
Miaomiao Gao ◽  
Biqiang Chen ◽  
Tianwei Tan ◽  
Hui Cao ◽  
...  
Keyword(s):  
Scale Up ◽  
Enzymatic Reaction ◽  
Synthesis Method ◽  
Cost Effective ◽  
Industrial Applications ◽  
Key Factors ◽  
Reaction Conditions ◽  
Mannose 6 Phosphate ◽  
Arthrobacter Species ◽  
Optimal Reaction

Mannose-6-phosphate (M6P) is involved in many metabolic pathways in life, and it has important applications in the treatment of diseases. This study explored a cost-effective enzyme catalytic synthesis method of M6P, using polyphosphate-dependent mannose kinase from Arthrobacter species. This synthesis uses polyphosphate to replace expensive ATP, and it is greener and safer than chemical synthesis. This study investigated the effects of key factors such as metal ions, temperature, and substrate addition on this enzymatic reaction, and improved the conversion efficiency. We moreover take advantage of the response surface method to explore the best catalytic conditions synthetically. The conversion was 99.17% successful under the optimal reaction conditions. After a series of optimizations, we carried out a 200 mL scale-up experiment, which proved that the method has good prospects for industrial applications.

Tetrahedrites for Low Cost and Sustainable Thermoelectrics

2016 ◽  
Vol 257 ◽  
pp. 135-138 ◽  
Author(s):  
António Pereira Gonçalves ◽  
Elsa Branco Lopes ◽  
Judith Monnier ◽  
Eric Alleno ◽  
Claude Godart ◽  
...  
Keyword(s):  
Thermoelectric Materials ◽  
High Performance ◽  
Low Cost ◽  
Scale Up ◽  
Raw Material ◽  
Thermoelectric Devices ◽  
Long Term Stability ◽  
Thermoelectric Systems ◽  
Resistance To Oxidation

Sustainable development is the way to ensure the Human progress within the bounds of the ecological possible. In this context thermoelectric systems can play an important role. However, the price of most high-performance thermoelectric devices is high, mainly due to the use of expensive elements, which raised the interest for cheap thermoelectric materials. It is also clear that the production of competitive thermoelectric devices critically depends on other factors, like the manufacturing costs, and that the materials fabrication simplicity, reproducibility, and use of easy scale-up processes will also play a fundamental role.Tetrahedrites, with generic formula Cu10M2Sb4S13 (M = Cu, Mn, Fe, Co, Ni, Zn), are world spread sulfosalt minerals that crystallize in the cubic Cu12Sb4S13-type structure. They are environment friendly materials mainly formed by non-expensive elements. Recently, mineral based and synthetic tetrahedrites were considered as promising thermoelectric materials, with zT ~ 1 at T ~ 700 K. Though, tetrahedrite melts incongruently, the preparation of appropriate tetrahedrite samples usually requiring long-term annealing procedures. Here we present a set of systematic studies on the use of tetrahedrites as low-cost and sustainable thermoelectric materials. The raw material prices evaluation, the feasibility of rapid, scalable, cheap tetrahedrite preparation and their long term stability and resistance to oxidation under working conditions are highlighted.

scholarly journals Green Route for Fabrication of Water-Treatable Thermoelectric Generators

2022 ◽  
Vol 2022 ◽  
pp. 1-12
Author(s):  
Shinichi Hata ◽  
Misaki Shiraishi ◽  
Soichiro Yasuda ◽  
Gergely Juhasz ◽  
Yukou Du ◽  
...  
Keyword(s):  
Thermoelectric Power ◽  
Organic Semiconductors ◽  
Thermoelectric Materials ◽  
High Performance ◽  
High Efficiency ◽  
Aqueous Media ◽  
Maximum Output Power ◽  
Maximum Output ◽  
Thermoelectric Generators ◽  
Green Route

Since future energy harvesting technologies require stable supply and high-efficiency energy conversion, there is an increasing demand for high-performance organic thermoelectric generators (TEGs) based on waterproof thermoelectric materials. The poor stability of n-type organic semiconductors in air and water has proved a roadblock in the development of reliable thermoelectric power generators. We developed a simple green route for preparing n-type carbon nanotubes (CNTs) by doping with cationic surfactants and fabricated films of the doped CNTs using only aqueous media. The thermoelectric properties of the CNT films were investigated in detail. The nanotubes doped using a cationic surfactant (cetyltrimethylammonium chloride (CTAC)) retained an n-doped state for at least 28 days when exposed to water and air, indicating higher stability than that for contemporary CNT-based thermoelectric materials. The wrapping of the surfactant molecules around the CNTs is responsible for blocking oxygen and water from attacking the CNT walls, thus, extending the lifetime of the n-doped state of the CNTs. We also fabricated thermoelectric power conversion modules comprising CTAC-doped (n-type) and sodium dodecylbenzenesulfonate- (SDBS-) doped (p-type) CNTs and tested their stabilities in water. The modules retained 80±2.4% of their initial maximum output power (at a temperature difference of 75°C) after being submerged in water for 30 days, even without any sealing fills to prevent device degradation. The remarkable stability of our CNT-based modules can enable the development of reliable soft electronics for underwater applications.

scholarly journals Fabrication of High-Performance Bamboo–Plastic Composites Reinforced by Natural Halloysite Nanotubes

Molecules ◽  
2020 ◽  
Vol 25 (9) ◽  
pp. 2259
Author(s):  
Xiaobei Jin ◽  
Jingpeng Li ◽  
Rong Zhang ◽  
Zehui Jiang ◽  
Daochun Qin
Keyword(s):  
Thermal Stability ◽  
High Performance ◽  
Moisture Absorption ◽  
Mechanical Performance ◽  
Halloysite Nanotubes ◽  
Industrial Applications ◽  
High Concentration ◽  
Morphological Studies ◽  
Plastic Composites ◽  
The Impact

Bamboo-plastic composites (BPCs) as new biomass-plastic composites have recently attracted much attention. However, weak mechanical performance and high moisture absorption as well as low thermal stability greatly limit their industrial applications. In this context, different amounts of halloysite nanotubes (HNTs) were used as a natural reinforcing filler for BPCs. It was found that the thermal stability of BPCs increased with increasing HNT contents. The mechanical strength of BPCs was improved with the increase in HNT loading up to 4 wt% and then worsened, while the impact strengths were slightly reduced. Low HNT content (below 4 wt%) also improved the dynamic thermomechanical properties and reduced the water absorption of the BPCs. Morphological studies confirmed the improved interfacial compatibility of the BPC matrix with 4 wt% HNT loading, and high-concentration HNT loading (above 6 wt%) resulted in easy agglomeration. The results highlight that HNTs could be a feasible candidate as nanoreinforcements for the development of high-performance BPCs.

Scalable synthesis of bi-functional high-performance carbon nanotube sponge catalysts and electrodes with optimum C–N–Fe coordination for oxygen reduction reaction

2015 ◽  
Vol 8 (6) ◽  
pp. 1799-1807 ◽  
Author(s):  
Gang Yang ◽  
Woongchul Choi ◽  
Xiong Pu ◽  
Choongho Yu
Keyword(s):  
Catalytic Activity ◽  
Carbon Nanotube ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
High Performance ◽  
Synthesis Method ◽  
Three Dimensional ◽  
Reduction Reaction ◽  
Scalable Synthesis

Three-dimensional N/Fe-containing carbon nanotube sponges showing striking improvements in catalytic activity and stability were grown using a facile/scalable synthesis method.

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