scholarly journals Magnetic gas sensing: working principles and recent developments

2021 ◽  
Author(s):  
Pratik V. Shinde ◽  
Chandra Sekhar Rout
Keyword(s):  
Magnetic Properties ◽  
Gas Sensors ◽  
Gas Sensing ◽  
Review Article ◽  
Future Perspectives ◽  
Active Materials ◽  
Recent Developments

In magnetic gas sensors, the change in the magnetic properties of the active materials is measured. In this review article, the working principles, fundamentals, recent developments, and future perspectives in magnetic gas sensors are reviewed.

Schottky diodes based on 2D materials for environmental gas monitoring: a review on emerging trends, recent developments and future perspectives

2021 ◽  
Author(s):  
Minu Mathew ◽  
Chandra Sekhar Rout
Keyword(s):  
Gas Sensing ◽  
2D Materials ◽  
Schottky Diodes ◽  
High Sensitivity ◽  
Future Perspectives ◽  
Working Temperature ◽  
Emerging Trends ◽  
Gas Sensing Properties ◽  
Recent Developments ◽  
Sensitivity And Selectivity

This review details the fundamentals, working principles and recent developments of Schottky junctions based on 2D materials to emphasize their improved gas sensing properties including low working temperature, high sensitivity, and selectivity.

scholarly journals Recent Developments in Lignin- and Tannin-Based Non-Isocyanate Polyurethane Resins for Wood Adhesives—A Review

2021 ◽  
Vol 11 (9) ◽  
pp. 4242
Author(s):  
Manggar Arum Aristri ◽  
Muhammad Adly Rahandi Lubis ◽  
Sumit Manohar Yadav ◽  
Petar Antov ◽  
Antonios N. Papadopoulos ◽  
...  
Keyword(s):  
Automotive Industry ◽  
Polymeric Materials ◽  
Review Article ◽  
Future Perspectives ◽  
Wood Adhesives ◽  
Adhesion Properties ◽  
Lighting Industry ◽  
Renewable Natural Resources ◽  
Recent Developments ◽  
Strong Adhesion

This review article aims to summarize the potential of using renewable natural resources, such as lignin and tannin, in the preparation of NIPUs for wood adhesives. Polyurethanes (PUs) are extremely versatile polymeric materials, which have been widely used in numerous applications, e.g., packaging, footwear, construction, the automotive industry, the lighting industry, insulation panels, bedding, furniture, metallurgy, sealants, coatings, foams, and wood adhesives. The isocyanate-based PUs exhibit strong adhesion properties, excellent flexibility, and durability, but they lack renewability. Therefore, this study focused on the development of non-isocyanate polyurethane lignin and tannin resins for wood adhesives. PUs are commercially synthesized using polyols and polyisocyanates. Isocyanates are toxic, costly, and not renewable; thus, a search of suitable alternatives in the synthesis of polyurethane resins is needed. The reaction with diamine compounds could result in NIPUs based on lignin and tannin. The research on bio-based components for PU synthesis confirmed that they have good characteristics as an alternative for the petroleum-based adhesives. The advantages of improved strength, low curing temperatures, shorter pressing times, and isocyanate-free properties were demonstrated by lignin- and tannin-based NIPUs. The elimination of isocyanate, associated with environmental and human health hazards, NIPU synthesis, and its properties and applications, including wood adhesives, are reported comprehensively in this paper. The future perspectives of NIPUs’ production and application were also outlined.

scholarly journals Biomass-based chemical looping technologies: the good, the bad and the future

2017 ◽  
Vol 10 (9) ◽  
pp. 1885-1910 ◽  
Author(s):  
Xiao Zhao ◽  
Hui Zhou ◽  
Vineet Singh Sikarwar ◽  
Ming Zhao ◽  
Ah-Hyung A. Park ◽  
...  
Keyword(s):  
Review Article ◽  
Chemical Looping ◽  
Future Perspectives ◽  
The Future ◽  
Challenges And Opportunities ◽  
Recent Developments

This review article focuses on the challenges and opportunities of biomass-based chemical looping technologies and explores fundamentals, recent developments and future perspectives.

scholarly journals Photoacoustic-Based Gas Sensing: A Review

Sensors ◽  
2020 ◽  
Vol 20 (9) ◽  
pp. 2745 ◽  
Author(s):  
Stefan Palzer
Keyword(s):  
Gas Sensors ◽  
Gas Sensing ◽  
Optical Detection ◽  
Detection Limits ◽  
Review Article ◽  
Detection Methods ◽  
Attractive Alternative ◽  
Photoacoustic Effect ◽  
Miniaturized Devices

The use of the photoacoustic effect to gauge the concentration of gases is an attractive alternative in the realm of optical detection methods. Even though the effect has been applied for gas sensing for almost a century, its potential for ultra-sensitive and miniaturized devices is still not fully explored. This review article revisits two fundamentally different setups commonly used to build photoacoustic-based gas sensors and presents some distinguished results in terms of sensitivity, ultra-low detection limits, and miniaturization. The review contrasts the two setups in terms of the respective possibilities to tune the selectivity, sensitivity, and potential for miniaturization.

Nanomaterial gas sensors for biosensing applications: A Review

2021 ◽  
Vol 15 ◽  
Author(s):  
Kurmendra
Keyword(s):  
Gas Sensor ◽  
Crystalline Structure ◽  
Gas Sensors ◽  
Gas Sensing ◽  
Review Article ◽  
Morphological Properties ◽  
Future Research ◽  
Sensing Application ◽  
Detection Of Biomolecules ◽  
2D And 3D

Background: Nanomaterial is one of the most used materials for various gas sensing application to detect toxic gases, human breath, and other specific gas sensing. One of the most important applications of nanomaterial based gas sensors is as biosensing applications. In this review article, the gas sensors for biosensing are discussed by classifying gas sensors on the basis of crystalline structure and different categories of nanomaterial. Methods: In this paper, firstly rigorous efforts has been made to find out research questions by going through structured and systematic survey of available peer reviewed high quality articles in this field. The papers related to nanomaterial based biosensors are then reviewed qualitatively to provide substantive findings from the recent developments in this field. Results: In this review article, firstly classifications of nanomaterial gas sensors have been presented on the basis of crystalline structure of nanomaterial and different types of nanomaterial available for biosensing applications. Further, the gas sensors based on nanomaterial for biosensing applications are collected and reviewed in terms of their performance parameters such as sensing material used, target gas component, detection ranges (ppm-ppb), response time, operating temperature and method of detection etc. The different nanomaterials possess slightly different sensing and morphological properties due to their structure, therefore, it can be said that a nanomaterial must be selected carefully for particular application. The 1D nanomaterials show best selectivity and sensitivity for gases available in low concentration ranges due to their miniaturised structure as compared to 2D and 3D nanomaterials. However, these 2D and 3D nanomaterials also so good sensing properties compared to bulk semiconductor materials. The polymer and nanocomposites have opened door for future research and have great potential for new generation gas sensor for detecting biomolecules. Conclusion: These nanomaterials extend great properties towards sensing application of different gases for lower concentration of particular gas particles. Nano polymer and nano composites have great potential to be used gas sensor for detection of biomolecules.

scholarly journals Functions of Ionic Liquids in Preparing Membranes for Liquid Separations: A Review

Membranes ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 395
Author(s):  
Dayuan Zheng ◽  
Dan Hua ◽  
Yiping Hong ◽  
Abdul-Rauf Ibrahim ◽  
Ayan Yao ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Ionic Liquids ◽  
Vapor Pressure ◽  
Physical Properties ◽  
Review Article ◽  
Future Perspectives ◽  
Comprehensive Overview ◽  
Membrane Materials ◽  
Recent Developments ◽  
Liquid Separations

Membranes are widely used for liquid separations such as removing solute components from solvents or liquid/liquid separations. Due to negligible vapor pressure, adjustable physical properties, and thermal stability, the application of ionic liquids (ILs) has been extended to fabricating a myriad of membranes for liquid separations. A comprehensive overview of the recent developments in ILs in fabricating membranes for liquid separations is highlighted in this review article. Four major functions of ILs are discussed in detail, including their usage as (i) raw membrane materials, (ii) physical additives, (iii) chemical modifiers, and (iv) solvents. Meanwhile, the applications of IL assisted membranes are discussed, highlighting the issues, challenges, and future perspectives of these IL assisted membranes in liquid separations.

scholarly journals Photobiocatalysis in Continuous Flow

2022 ◽  
Vol 1 ◽  
Author(s):  
Santiago Nahuel Chanquia ◽  
Alessia Valotta ◽  
Heidrun Gruber-Woelfler ◽  
Selin Kara
Keyword(s):  
Continuous Flow ◽  
State Of The Art ◽  
Review Article ◽  
Future Perspectives ◽  
Practical Applications ◽  
Research Areas ◽  
Recent Developments ◽  
Catalytic Processes

In the last years, there were two fields that experienced an astonishing growth within the biocatalysis community: photobiocatalysis and applications of flow technology to catalytic processes. Therefore, it is not a surprise that the combination of these two research areas also gave place to several recent interesting articles. However, to the best of our knowledge, no review article covering these advances was published so far. Within this review, we present recent and very recent developments in the field of photobiocatalysis in continuous flow, we discuss several different practical applications and features of state-of-the art photobioreactors and lastly, we present some future perspectives in the field.

Trends in the Development of Gas Sensors

1989 ◽  
Vol 22 (6) ◽  
pp. 176-182 ◽  
Author(s):  
T A Jones
Keyword(s):  
Gas Sensors ◽  
Future Development ◽  
Gas Sensing ◽  
New Developments ◽  
Advantages And Disadvantages ◽  
Recent Developments

Recent developments in various types of gas sensing devices are examined and the advantages and disadvantages of currently available sensors in relation to the various application areas are summarized. Possible directions of future development are identified and discussed. The trends in the ways that sensors are utilized and the possible impact of new developments in a number of application areas are considered.

Terrorism and military actions pose the ultimate challenge to gas sensing

Sensor Review ◽  
2011 ◽  
Vol 31 (1) ◽  
pp. 6-12 ◽  
Author(s):  
Robert Bogue
Keyword(s):  
Gas Sensors ◽  
Gas Sensing ◽  
Research Effort ◽  
Chemical Warfare Agents ◽  
Content Type ◽  
Us Military ◽  
The Us ◽  
Recent Developments ◽  
Warfare Agents ◽  
Technological Challenge

PurposeThis paper aims to provide a review of the uses of gas sensors to detect explosives' vapours and chemical warfare agents (CWAs).Design/methodology/approachFollowing a brief introduction, this paper first considers the use of gas sensors to detect explosives. Second, gas sensors that respond to CWAs are discussed. Some mentioned is made of commercial devices but the emphasis is on emerging technologies and recent research.FindingsDetecting explosives is an emerging application for gas sensors. Despite some commercial products, it is the topic of a major research effort and poses a significant technological challenge due to the very low vapour concentrations involved. Many optical and solid‐state techniques are under development and some have shown ppt levels of resolution to TNT and allied compounds. Detecting CWAs is a far more mature application and many products exist, often based on analytical methods. Nevertheless, research into improved sensing techniques continues, frequently aimed at detecting ppb concentrations of nerve agents. Much of this research is aimed at meeting the needs of, and is being funded by, the US military and security agencies.Originality/valueThis paper provides a technical review of recent developments in the use of gas sensors to detect explosives and CWAs.

Metal-oxide based ammonia gas sensors: A review

2020 ◽  
Vol 10 ◽  
Author(s):  
Priya Gupta ◽  
Savita Maurya ◽  
Narendra Kumar Pandey ◽  
Vernica Verma
Keyword(s):  
Metal Oxide ◽  
Metal Oxides ◽  
Gas Sensor ◽  
Gas Sensors ◽  
Review Paper ◽  
Gas Sensing ◽  
Gas Sensitivity ◽  
Ammonia Gas ◽  
Ammonia Sensing ◽  
Ammonia Gas Sensors

: This review paper encompasses a study of metal-oxide and their composite based gas sensors used for the detection of ammonia (NH3) gas. Metal-oxide has come into view as an encouraging choice in the gas sensor industry. This review paper focuses on the ammonia sensing principle of the metal oxides. It also includes various approaches adopted for increasing the gas sensitivity of metal-oxide sensors. Increasing the sensitivity of the ammonia gas sensor includes size effects and doping by metal or other metal oxides which will change the microstructure and morphology of the metal oxides. Different parameters that affect the performances like sensitivity, stability, and selectivity of gas sensors are discussed in this paper. Performances of the most operated metal oxides with strengths and limitations in ammonia gas sensing application are reviewed. The challenges for the development of high sensitive and selective ammonia gas sensor are also discussed.

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