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Thermal properties

Tingting You, Xin Li, Ruizhen Wang, Xueming Zhang, Feng Xu
Synergistic fungal pretreatment involving white-rot and brown-rot fugal pretreatment has shown great potential for enhancing the yield of sugars from biomass time-effectively and environmentally benign. In this work, the effects of this integrated fungal pretreatment on lignin characteristics and thermal behavior of corncob were examined in the view of whole plant valorization. The results show that an efficient deconstruction of lignin was achieved by white-rot fungus, and subsequent brown-rot fungus promoted the preferential breakdown of guaiacyl units, further enhancing lignin extraction efficiency (62...
October 2, 2018: Bioresource Technology
Jiangkun Dai, Wenjia Dan, Siyu Ren, Congguo Shang, Junru Wang
Thirty-three new quaternization harman analogues were synthesized and their antibacterial activity against four Gram-positive and two Gram-negative bacteria were evaluated. The structure-activity relationships were summarized and compounds 4f, 4i, 4l, 4u, 4w, 4x and 5c showed excellent antibacterial activity, low cytotoxicity, good thermal stability and "drug-like" properties. In particular, compound 4x exhibited better bactericidal effect (4-fold superiority against methicillin-resistant Staphylococcus aureus) than standard drugs fosfomycin sodium and ampicillin sodium (minimum inhibitory concentration = 50 nmol/mL)...
October 6, 2018: European Journal of Medicinal Chemistry
Md Manik Mian, Guijian Liu
Novel TiO2 /Fe/Fe3 C-biochar composite, as a heterogeneous catalyst, has been synthesized by a single-step route, where sewage sludge (SS) and different ratios of nanoparticles (NPs: Fe and Ti) impregnated with chitosan using coagulation and flocculation techniques for subsequent thermal decomposition at 800 °C. The physiochemical properties of samples have been characterized thoroughly and employed in methylene blue (MB) degradation tests. It was found that NPs ratio and chitosan support have significant influences on the properties and catalytic activity of catalysts...
October 6, 2018: Chemosphere
Xuejie Yue, Tao Zhang, Dongya Yang, Fengxian Qiu, Zhangdi Li, Gengyao Wei, Yu Qiao
To maintain personal thermal comfort in cold weather, indoor heating consumes large amount of energy and is a primary source of greenhouse gas emission. Traditional clothes are too thick for thermal comfort in cold outdoor environment, resulting the lower wearing comfort. In this work, a multifunctional Ag nanoparticles/cellulose fibers thermal insulation membrane starting from waste paper cellulose fibers was prepared via simple silver mirror reaction and subsequent vacuum filtration process to improve the infrared reflection properties of membranes for human thermal insulation...
October 5, 2018: Journal of Colloid and Interface Science
Baranya Murugan, Uma Maheswari Krishnan
Nanotechnology-based interventions have gained popularity in the past decade for cancer therapy owing to their ability to overcome several shortcomings encountered in conventional therapy. Among the various nanoparticles that have been explored as drug carriers, mesoporous silica possesses certain desirable properties such as regulated pore size, high surface area, chemical and thermal stability, amenability for surface modification and biocompatibility. These systems have been widely investigated for site-specific delivery of single and multiple therapeutic agents as well as for imaging and theranostic applications...
October 10, 2018: International Journal of Pharmaceutics
Yan Xu, Shixin Li, Zengshuai Yan, Zhen Luo, Hao Ren, Baosheng Ge, Fang Huang, Tongtao Yue
A growing number of proteins have been identified as knotted in their native structures, with such entangled topological features being expected to play stabilizing roles maintaining both the global fold and the nature of proteins. However, the molecular mechanism underlying the stabilizing effect is ambiguous. Here, we combine unbiased and mechanical atomistic molecular dynamics simulations to investigate how a protein is stabilized by an inherent knot by directly comparing chemical, thermal, and mechanical denaturing properties of two proteins having the same sequence and secondary structures but differing in the presence or absence of an inherent knot...
September 22, 2018: Biophysical Journal
Bartolomeo Coppola, Nicola Cappetti, Luciano Di Maio, Paola Scarfato, Loredana Incarnato
In this study, the possibility of using a layered silicate-reinforced polylactic acid (PLA) in additive manufacturing applications was investigated. In particular, the aim of this work was to study the influence of printing temperature in the 3D printing process of PLA/clay nanocomposites. For this reason, two PLA grades (4032D and 2003D, D-isomer content 1.5 and 4, respectively) were melt-compounded by a twin screw extruder with a layered silicate (Cloisite 30B) at 4 wt %. Then, PLA and PLA/clay feedstock filaments (diameter 1...
October 11, 2018: Materials
Artid Poonyakan, Manaskorn Rachakornkij, Methi Wecharatana, Watanachai Smittakorn
The use of plastics has increased over the years, thus resulting in a large volume of plastic waste being generated and accumulated in the environment. Due to its non-biodegradability and persistence, recycling processes have become one of the sustainable solutions for preventing environmental deterioration. Plastic wastes, including high density polyethylene (HDPE), low density polyethylene (LDPE), polypropylene (PP), and polyethylene terephthalate (PET), were collected from industrial sector and used as additional ingredients to improve concrete properties...
October 11, 2018: Materials
Christian Schwechheimer, Franziska Rönicke, Ute Schepers, Hans-Achim Wagenknecht
A new set of cyanine-indole dyes was synthesized, characterized by optical and cytotoxic properties and subsequently applied for live cell imaging. Furthermore, these dyes were postsynthetically linked covalently to the 2'-position of uridine anchors in presynthesized oligonucleotides using the copper(i)-catalyzed azide-alkyne cycloaddition in order to evaluate their photostability and imaging properties in living cells. The nucleophilicity at position C-2 of the indole part of the dyes was elucidated as key for a new structure-activity relationship that served as a rational guide to improve the photostability and optical properties of these green-emitting dyes for live cell imaging of nucleic acids...
August 21, 2018: Chemical Science
Meixia Zheng, Fengli Lian, Yao Xiong, Bo Liu, Yujing Zhu, Song Miao, Longtao Zhang, Baodong Zheng
To improve the thermal stability and adsorption performance, xanthan gum was modified with acrylamide and trimethylolpropane triglycidyl ether (TTE). The modified xanthan gum (XGTTE) was characterized by Fourier transform infrared (FT-IR) spectroscopy, X-ray diffractogram (XRD), differential scanning calorimetry (DSC) and scanning electron microscopy (SEM). The characteristic peaks at 3449, 1655, 1611 and 1420 cm-1 in the FT-IR confirm the modification. The XGTTE crystal grew well upon addition of TTE. The XRD and DSC data revealed that the XGTTE enhanced its thermal stability...
January 30, 2019: Food Chemistry
Meng-Na Li, Ying Xie, Han-Qing Chen, Bao Zhang
In this study, wheat starch, A- and B-type starch granules were firstly treated with citric acid (CT) and then subjected to heat-moisture treatment (HMT). The maximum thermo-stable resistant starch (RS) contents reached 71.52%, 71.27%, 71.58% for CT-HMT wheat starch, A- and B-type starch granules, respectively. The hydrolysis kinetic parameters (C∞ and k) reduced after CT-HMT. Differential scanning calorimetry (DSC) and X-ray diffraction (XRD) results revealed that the endothermic and crystalline peaks of CT-HMT starch samples disappeared...
January 30, 2019: Food Chemistry
Teresa Aguilar, Ivan Carrillo-Berdugo, Roberto Gómez-Villarejo, Juan Jesús Gallardo, Paloma Martínez-Merino, José Carlos Piñero, Rodrigo Alcántara, Concha Fernández-Lorenzo, Javier Navas
Nanofluids are systems with several interesting heat transfer applications, but it can be a challenge to obtain highly stable suspensions. One way to overcome this challenge is to create the appropriate conditions to disperse the nanomaterial in the fluid. However, when the heat transfer fluid used is a non-polar organic oil, there are complications due to the low polarity of this solvent. Therefore, this study introduces a method to synthesize TiO₂ nanoparticles inside a non-polar fluid typically used in heat transfer applications...
October 10, 2018: Nanomaterials
Guangjun Zhai, Jinguo Wang, Zimei Chen, Shuaifeng Yang, Yong Men
Three-dimensionally ordered macroporous (3DOM) Co3 O4 -CeO2 catalysts with controllable Co/Ce molar ratios synthesized by colloidal crystal template method were developed to catalyze the NOx -assisted soot oxidation for the first time, and the obtained 3DOM Co3 O4 -CeO2 catalysts exhibited highly enhanced soot oxidation activity. Detailed characterizations of 3DOM Co3 O4 -CeO2 catalysts revealed that the highly enhanced soot oxidation activity was originated from the synergistic promoting effect by combining the macroporous effect resulted from the unique 3DOM framework, the chemical nature associated with more Co3+ reactive sites, the surface enrichment of Ce species and the improved redox properties...
September 24, 2018: Journal of Hazardous Materials
Amélie Leroux, Christophe Egles, Véronique Migonney
The anterior cruciate ligament rupture is one of the most common sport injuries. Due to ligaments' poor healing capacity, surgical intervention is often required. Nowadays, these injuries are managed using replacement autografts or to a lesser extent using artificial ligaments. With the expansion of tissue engineering, more recent researches focus on the development of biodegradable structures that could allow graft functioning while enhancing host integration. The main challenge is to develop a structure that gradually loses its mechanical properties when at the same time the neo-ligament gains in solidity...
2018: PloS One
Yunshan Zhao, Gang Zhang, Mui Hoon Nai, Guangqian Ding, Dengfeng Li, Yi Liu, Kedar Hippalgaonkar, Chwee Teck Lim, Dongzhi Chi, Baowen Li, Jing Wu, John T L Thong
Black phosphorus (BP) has emerged as a promising candidate for next-generation electronics and optoelectronics among the 2D family materials due to its extraordinary electrical/optical/optoelectronic properties. Interestingly, BP shows strong anisotropic transport behavior because of its puckered honeycomb structure. Previous studies have demonstrated the thermal transport anisotropy of BP and theoretically attribute this to the anisotropy in both the phonon dispersion relation and the phonon relaxation time...
October 11, 2018: Advanced Materials
Michael Guerette, Michael R Ackerson, Jay Thomas, E Bruce Watson, Liping Huang
In situ Raman and Brillouin light scattering techniques were used to study thermally induced high-density amorphous (HDA) to low-density amorphous (LDA) transition in silica glass densified in hot compression (up to 8 GPa at 1100 °C). Hot-compressed silica samples are shown to retain structural and mechanical stability through 600 °C or greater, with reduced sensitivity in elastic response to temperature as compared with pristine silica glass. Given sufficient thermal energy to overcome the energy barrier, the compacted structure of the HDA silica reverts back to the LDA state...
May 21, 2018: Journal of Chemical Physics
Duraivelan Palanisamy, Wouter K den Otter
We present an efficient general method to simulate in the Stokesian limit the coupled translational and rotational dynamics of arbitrarily shaped colloids subject to external potential forces and torques, linear flow fields, and Brownian motion. The colloid's surface is represented by a collection of spherical primary particles. The hydrodynamic interactions between these particles, here approximated at the Rotne-Prager-Yamakawa level, are evaluated only once to generate the body's (11 × 11) grand mobility matrix...
May 21, 2018: Journal of Chemical Physics
Lucia R Dumitrescu, Henk Huinink, David M J Smeulders, Jacques A M Dam, Silvia V Gaastra-Nedea
Nucleation of highly supersaturated water vapor in helium, methane, and argon carrier gases at 350 K was investigated using molecular dynamics simulations. Nucleation rates obtained from the mean first passage time (MFPT) method are typically one order of magnitude lower than those from the Yasuoka and Matsumoto method, which can be attributed to the overestimation of the critical cluster size in the MFPT method. It was found that faster nucleation will occur in carrier gases that have better thermalization properties such that latent heat is removed more efficiently...
May 21, 2018: Journal of Chemical Physics
Neil Raymond, Dmitri Iouchtchenko, Pierre-Nicholas Roy, Marcel Nooijen
We introduce a new path integral Monte Carlo method for investigating nonadiabatic systems in thermal equilibrium and demonstrate an approach to reducing stochastic error. We derive a general path integral expression for the partition function in a product basis of continuous nuclear and discrete electronic degrees of freedom without the use of any mapping schemes. We separate our Hamiltonian into a harmonic portion and a coupling portion; the partition function can then be calculated as the product of a Monte Carlo estimator (of the coupling contribution to the partition function) and a normalization factor (that is evaluated analytically)...
May 21, 2018: Journal of Chemical Physics
Xinping Zhang, Huicheng Ren, Aihua He
Two-dimensional (2D) nanomaterials with unique features like a large surface-to-volume ratio and the quantum confinement effect have attracted great attention for applications in energy storage, catalysis, sensing, membranes, etc. Silica (SiO2)-based nanosheets, as members of the 2D material family, are extremely intriguing because of their unique electronic insulation, bio-compatibility and profound chemical and thermal stability. However, there is still a lack of available approaches for fabricating SiO2 nanosheets in a simple, large-scale and cost-effective fashion...
October 11, 2018: Nanoscale
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