Unprecedented Nonflammable Organic Adhesives Leading to Fireproof Wood Products

Abstract

We report an excellent water-based inflammable organic wood adhesive that is able to protect wood products from burning by generating inflammable gases, a porous thick char layer, and radicals that consume the oxygen and hydrogen radicals required in the burning process. The organic adhesive is obtained by the formation of hard supramolecular phases composed of high-density flame-retardant N and P elements through hydrogen bonding and acid–base interaction between the phytic acid and branched polyethylenimine (b-PEI). The phytic acid molecules are packed densely in the framework of the flexible b-PEI so that a porous char layer that would reduce heat conduction can be formed as the adhesive is heated. Together with the formation of inflammable NH3 gas to dilute the oxygen concentration and a PO• radical to capture the H• and O• radicals, the adhesive-treated wood product displays an extremely high limited oxygen index of 100% and a negligible heat release rate, total heat release, and total smoke release. The current flame-retardant water-based organic adhesive is so far the best adhesive for green and safe wood products from burning.

Nanomaterial-based biosensors for the detection of foodborne bacteria: a review

“…91 (d) Schematic illustration of the working principle of mZIF-8/GOx conjugate for the detection of bacteria using a pH meter as a readout. 95…”

“…MOFs have proved to be a more ideal carrier for enzyme immobilization because of their ultra-high porosity and surface area. 94 Gao et al 95 developed a pH meter-assisted biosensor based on GOx coupled magnetic zeolite imidazolate framework-8 (mZIF-8) for field assessment of bacterial contamination. As shown in Fig.…”

Synthesis and Applications of Supramolecular Flame Retardants: A Review

“…Most of these small molecules contain flame-retardant elements with abundant active sites. Shuitao Gao [ 76 ] used PA and branched polyethylenimide (b-PEI) as the basic units. A 3D network was assembled through hydrogen bonding and electrostatic interaction between the phosphonic acid group of PA and the amino and imino groups of b-PEI ( Figure 8 a).…”

“… ( a ) Schematic diagram and physical diagram of PA and b-PEI assembly; SEM image of the assembled sample after lyophilization [ 76 ]. ( b ) The chemical structure of two units for assembly, and the structure diagram in the assembly process [ 77 ].…”

Real-Time pH Sensor in Bacterial Microenvironments Using Liquid Crystal Core–Shell Microspheres

“…4 Consequently, monitoring the localized pH of the bacterial microenvironment is vital for comprehending bacterial adaptation and behavior in the presence of chemical or mechanical stimuli. 5,6 The developments of localized pH measurement are prosperous, 7 with notable sensors based on nanomaterials, 8 fluorescent pH indicators, 9 and microfabricated electrodes 10 being proposed to improve sensitivity, precision, and real-time monitoring capabilities. However, these pH sensors have their limitations.…”