Herein, magnetic wood was successfully prepared by in situ synthesizing Fe3O4 wood, through coprecipitation chemical interactions. A facile impregnation method, vacuum followed pressure impregnation, introduced to transport the adequate amount of ferric salt precursor and further shorten required production cycle. It demonstrated that obtained products exhibited outstanding microwave-absorbing properties. The best electromagnetic interference (EMI) absorbing properties could reach −64.26 dB...

Here, we synthesized Fe/C composites with different crystal structures (Fe3O4@C, Fe3O4/Fe@C, or Fe3C@C) by carbonizing iron(III) 2,4-pentanedionate (Fe(acac)3) pre-enriched forestry waste wood at pyrolysis temperatures from 400 to 1000 °C. The obtained samples are porous 3D (three-dimensional) biochars inlaid varied Fe phases. corresponding EMW absorbing properties proved be dependent on the temperature, as well resulting and graphitization degrees. Among them, Fe3C@C °C possesses excellent...

With the rapid growth in use of wireless electronic devices, society urgently needs electromagnetic wave (EMW) absorbing material with light weight, thin thickness, wide effective band width, and strong absorption capacity. Herein, multi-layer magnetic composite boards are fabricated by hot-pressing fiber normal veneer layer-by-layer. The fibers obtained using in-situ chemical co-precipitation used to fabricate board hot-pressing. capacities 72 h impregnation time exhibit strongest...

In this study, the low-cost processing residue of Radiata pine (Pinus radiata D. Don) was used as lone carbon source for synthesis CQDs (Carbon quantum dots) with a QY (The yield CQDs) 1.60%. The were obtained by hydrothermal method, and +a PVA-based biofilm prepared fluidized drying method. effects CNF (cellulose nanofibers) content on morphology, optical, mechanical, water-resistance, wettability properties PVA/CQDs PVA/CNF/CQDs films are discussed. results revealed that, when excitation...

Blue luminescent carbon quantum dots (CQDs) were prepared from cyanobacteria by a hydrothermal method. The PL yields of the obtained CQDs was 5.30%. Cyanobacteria-based dots/polyvinyl alcohol/nanocellulose composite films prepared, which could emit bright blue under UV light. FTIR characterization showed that had hydroxyl groups on surface and no new formed after combining three materials. photoluminescence (PL) spectra revealed emission excitation dependent. Studies water resistance...

With a view to evaluating the impact of combination densification and thermal treatment on dimensional stability surface hardness, poplar (Populus lasiocarpa Oliv.) lumber was densified under three compression ratios (10, 18, 25%), press temperatures (130, 150, 170°C), two pressure holding times (15 35 min). It subsequently thermally treated at (180, 190, 200°C) exposure (1.5, 2.5, 3.5 h). Density, density profiles, water-soaked radial (thickness) swelling, hardness were examined. The...

The physical and mechanical properties of thermally modified wood (TMW) have been comprehensively studied; however, the quantitative analysis water states cell wall pores TMW is limited. In this work, Douglas fir Norway spruce were at 180, 200 220 °C, then studied by NMR cryoporometry method. results show that samples had lower fiber saturation point bound content than reference all experimental temperatures, indicating reduced hygroscopicity due to thermal modification (TM). addition, TM...

Abstract Poplar wood was modified by a combination of thermo-mechanical densification (TMD) and heat treatment (HT) process at five temperatures ranging from 170 to 210°C. A new two-step conditioning method (CM) is suggested, in the course which submitted 50°C/99% RH→25°C/65% RH, where RH means relative humidity climate chamber. The traditional one-step CM (25°C/65% RH) served as reference. effects history on hardness were observed analyzed along with change dimensional stability. lower case...

The interactive effect of the thermo-mechanical densification and heat treatment on set-recovery modified wood were investigated for optimizing combined modification process in this study.Process parameters such as temperature, duration densification, temperature selected main factors.Three levels each these factors chosen, then nine experiments plus one verification experiment conducted according to principles Taguchi DoE method results ANOVA analysis.It was observed that dimensional...

To investigate the surface properties of different modified poplar (Populus tomentosa Carr.) wood samples, color, roughness, and wettability untreated (control) via heat treatment, resin impregnation, impregnation combined treatment were analyzed compared in this study. The impregnant used test was a urea-formaldehyde with low molecular weight viscosity. results showed that lightness samples sorted order as follows: control lighter than impregnated sample, which sample. relatively smooth,...

Abstract Whether water sorption hysteresis exists above 75 °C and the representation of its relationship with wood softening remains unclear. In this study, at three temperature levels, namely, 75, 90 99.5 °C, was investigated using accurately controlled conditioning chambers powder samples from seven species. The dry mass loss percentage proper equilibrium time evaluated by pretests to ensure reliable isotherms afterwards. after entire isotherm running needs be kept within 0.5% avoid...

To investigate the effects of urea-formaldehyde (UF) resin impregnation combined heat treatment (IMPG-HT) on pyrolysis behavior poplar wood, chemical composition, characteristics, kinetics, and gaseous products released during untreated (control), IMPG-HT, IMPG HT woods were analyzed. The results demonstrate that IMPG-HT changes wood significantly. Unlike control samples, thermogravimetric / derivative (TG/DTG) curves shift toward lower temperature, shoulder DTG weaken or even disappear....

Moisture content (MC) has an important effect on the performance of wood in service. In attempt to rapidly and non-destructively acquire MC heat-treated wood, a radio frequency-type moisture meter was used take 170, 185, 200 °C Manchurian ash Mongolian pine samples as well reference (conventional kiln-dried) samples. A linear regression analysis applied assess relationship between values obtained using those oven-dry method by fitting data points according least squares method. From results...

This study proposes a reliability-based topology optimization model reconstruction method considering stress constraints to solve the problem of high on crane boom head in working process. Firstly, empty area is filled as design region. Next, random variables and reliability indexes are set, performed for Finally, reconstructed professional software. The irregular uplift entity parts designed ribbed plates support structures obtain regular optimized model. Meanwhile, finite element analysis...

Neuron-specific enolase (NSE), a tumor marker of small cell lung cancer (SCLC), has high application value in the early diagnosis SCLC.

Abstract Small-diameter Masson pine ( Pinus massoniana ) logs with a length of 800 mm and diameter ranging from 108 to 132 were dried mild schedule in laboratory dryer. The drying experiments done using or without bark longitudinal cut. reduction moisture content over time was monitored by resistance-type meter. results indicated that small-diameter can be the proposed successfully. Debarking reduced times; however, more checks on log surfaces detected. Making cut helped increase rate reduce...

In order to study the effects of a messmate heartwood extraction process on its cell wall pore structure and drying ability, nanopore was explored after via gas adsorption technology. Specifically, particles were extracted with methanol, then original samples evaluated by N2 CO2 sorption pycnometer methods, respectively. Overall, compared samples, porosity, micropore volume, mesopore BET specific surface area, area micropores heartwoods increased 2.55%, 0.007 cm3/g, 0.0014 0.24 m2·g-1, 21.9...