M. Tauhidul Islam

Bio: M. Tauhidul Islam is an academic researcher from National Cheng Kung University. The author has contributed to research in topics: Computer science & Medicine. The author has an hindex of 8, co-authored 22 publications receiving 263 citations. Previous affiliations of M. Tauhidul Islam include Bangladesh Atomic Energy Commission & Mawlana Bhashani Science and Technology University.

A PEDOT:PSS and graphene-clad smart textile-based wearable electronic Joule heater with high thermal stability

Abstract: Intelligent, highly conductive, robust, and flexible electronic textile-embedded smart devices hold surging interest in the wearable personalized heating system or thermotherapy. However, designing of these structures with desirable thermotherapy properties hinges on certain aspects such as fast temporal responsiveness, localized tunable heating characteristics, reliability, and stable conductive media over several mechanical disturbances as well as readily scalable opportunities. To address these issues, in this work, a facile and scalable dip-coating approach was devised to develop a stretchable, thermally stable, and electroconductive composite cotton textile with reduced graphene oxide (rGO) and poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) (CGP). The electromechanical properties of CGPs were greatly enhanced due to crystallographic and intra-intermolecular hydrogen bond energy/distance modification. The CGPs fabricated through the systematic dip-coating and drying approach demonstrated outstanding morphological synergies and structural benefits, providing effective endurance against deformations with excellent stable heating up to 60% strain. The composite heater endowed rapidly responsive (15–25 s) Joule heating characteristics, stable heating/cooling cycle and excellent durability to wash. The real-time operation of a wearable fabric heater attached to the finger and palm area of the hand is presented, suggesting its excellent avenues in the personalized electronic healthcare system through tunable and specific region-wise body temperature management for thermotherapy applications.

Ecological risk assessment and health safety speculation during color fastness properties enhancement of natural dyed cotton through metallic mordants

Abstract: Variety and durability of color are presumed as key constrains of natural dyes. So, this study attempts to investigate the effect of metallic mordants on the color fastness properties of ecologically dyed cotton fabric using banana floral stem sap. Color difference was measured in terms of hue (ΔH*), chroma (ΔL*) and value (ΔC*) difference. Metal ions in residual mordanting bath, dyeing wastewater and level of trace metals in the finished fabric surface were accessed to justify the environmental safety and speculate the health risk respectively. Pre-mordanted specimens were dyed at 100 °C for 60 min. Optical properties of extracted sap were observed by UV visible spectroscopy. Dye fixation with fiber was determined by FTIR-ATR spectra. Atomic absorption spectroscopy was employed to determine the trace metals in finished fabric. Effect of metallic mordants were calculated in terms of color fastness to wash, water, perspiration, rubbing and light for estimating the color durability. Except light fastness property almost all color fastness values were 4/5, i.e. very good. Light fastness properties were improved for mordanting action with metallic salts. The level of trace metals in finished fabric were within the safe zone.

American Society for Testing and Materials

Abstract: The American Society for Testing and Materials (ASTM) is an independent organization devoted to the development of standards.

Heating and cooling energy trends and drivers in buildings

Abstract: The purpose of this paper is to provide a source of information on thermal energy use in buildings, its drivers, and their past, present and future trends on a global and regional basis. Energy use in buildings forms a large part of global and regional energy demand. The importance of heating and cooling in total building energy use is very diverse with this share varying between 18% and 73%. Biomass is still far the dominant fuel when a global picture is considered; the role of electricity is substantially growing, and the direct use of coal is disappearing from this sector, largely replaced by electricity and natural gas in the most developed regions. This paper identifies the different drivers of heating and cooling energy demand, and decomposes this energy demand into key drivers based on a Kaya identity approach: number of households, persons per household, floor space per capita and specific energy consumption for residential heating and cooling; and GDP, floor space per GDP, and specific energy consumption for commercial buildings. This paper also reviews the trends in the development of these drivers for the present, future – and for which data were available, for the past – in 11 world regions as well as globally. Results show that in a business-as-usual scenario, total residential heating and cooling energy use is expected to more or less stagnate, or slightly decrease, in the developed parts of the world. In contrast, commercial heating and cooling energy use will grow in each world region. Finally, the results show that per capita total final residential building energy use has been stagnating in the vast majority of world regions for the past three decades, despite the very significant increases in energy service levels in each of these regions.

Effect of natural filler materials on fiber reinforced hybrid polymer composites: An Overview

Abstract: In past decades researchers found many difficulties while providing environmentally supportive materials for product making. Natural fibers possess many advantages over synthetic fibers such as eas...