Article
Materials Science, Paper & Wood
Qi Sun, Wenjun Xu, Yue Qiu
Summary: In this study, a comparative analysis was conducted on the decomposition behavior of nitrocellulose supplemented with nitric acid or sulfuric acid, revealing that the involvement of nitric acid reduces the onset temperature and activation energy, making nitrocellulose more prone to self-accelerating decomposition.
Article
Materials Science, Paper & Wood
Qi Sun, Yue Qiu
Summary: This paper investigated the risks of nitrocellulose used for lacquers in terms of spontaneous combustion through experimental and mathematical methods. The study analyzed the heat generation behavior and kinetic parameters of thermal decomposition of nitrocellulose at different nitrogen contents and masses. It also examined the effects of heating rate and atmosphere on thermal behavior and derived critical ignition temperature and self-accelerating decomposition temperature. The research found that nitrocellulose with higher nitrogen content or larger package size had lower activation energy and thermal risks.
Article
Materials Science, Paper & Wood
Shiying Li, Yu Li, Yajun Ding, Ye Yuan, Zhongliang Xiao
Summary: This paper successfully synthesized sodium carboxymethyl-nitrocellulose (CMNC) with thermal stability, flame suppression, and anti-migration properties by reacting nitrocellulose with denitration and etherification. The thermal stability of CMNC was found to be better than that of original nitrocellulose, and its thermal decomposition behaviors were similar to both nitrocellulose and carboxymethyl cellulose.
Article
Health Care Sciences & Services
Zoran Nikolovski, Dario Vrdoljak, Nikola Foretic, Mia Peric, Dora Maric, Charalampos Fountoulakis
Summary: This study aimed to determine the effect of slow-paced breathing (SPB) on acute stress in handball coaches during official matches. The results showed that SPB training led to a decrease in salivary cortisol concentration and alpha-amylase activity, and improved heart rate changes. Therefore, SPB could be used as a tool to help coaches achieve a desirable mental state during matches.
Article
Chemistry, Physical
Mohammed Dourari, Ahmed Fouzi Tarchoun, Djalal Trache, Amir Abdelaziz, Slimane Bekhouche, Abdelatif Harrat, Hani Boukeciat, Nawel Matmat
Summary: The present study developed new energetic composites containing nanostructured nitrocellulose or nitrated cellulose, hydrazinium nitro triazolone, and MgAl-CuO nanothermite. Various analytical techniques were used to analyze the prepared energetic formulations, and kinetic modeling was used to elucidate the catalytic impact of MgAl-CuO on the thermal behavior. The findings demonstrated the potential application of these newly elaborated composites in the next generation of composite explosives and high-performance propellants.
Article
Engineering, Multidisciplinary
Jie Xiong, Bo Jin, Xue-mei Yu, Ling Liao, Ru-fang Peng
Summary: A series of fullerene anisole derivative stabilizers were synthesized and characterized, showing good compatibility with nitrocellulose and effective stabilization of its degradation process.
DEFENCE TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Qiong Wang, Lu-ping Xu, Chong-qing Deng, Er-gang Yao, Hai Chang, Wei-qiang Pang
Summary: Nanoscale composite energetic materials (CEMs) based on oxidizer and fuel have potential advantages in energy adjustment and regulation. Micro- and nanosized fibers based on nano nitrocellulose (NC)-ammonium dinitramide (ADN) were prepared and characterized. The results showed that the fibers had a fluffy 3D macrostructure with energetic particles embedded. ADN reduced the first exothermic peak temperature and moved the pressure rise time forward. It also decreased the ignition delay time and enhanced the burning intensity of the fibers, while reducing the mechanical sensitivities.
Article
Nanoscience & Nanotechnology
Imen Boumar, Muhammedin Deliorman, Pavithra Sukumar, Mohammad A. Qasaimeh
Summary: This paper introduces a novel hybrid flow assay for the detection and screening of IgM and IgG antibodies in SARS-CoV-2 infections. The assay utilizes gold nanoparticles conjugated with SARS-CoV-2 S and N proteins to capture antibodies from a small amount of blood in just one step and provides quick results. The adhesive bandage-like design allows for rapid, low-cost, and easy-to-use tests for large-scale detection and screening in households.
MICROSYSTEMS & NANOENGINEERING
(2023)
Article
Materials Science, Paper & Wood
Xiaofei Qi, Ning Yan, Hongyan Li, Yu Zhao, Peijin Lin, Qilong Yan
Summary: This study investigates the relaxation behavior and molecular interactions of nitrocellulose blended with an insensitive plasticizer through dynamic mechanical analysis and molecular dynamics simulations. The results show that with increasing temperature, the elastic modulus of the material decreases, indicating enhanced mobility of the polymer chain elements and increased rotation of molecular bonds.
Article
Materials Science, Paper & Wood
Yang Zhao, Bo Jin, Tian Zheng, Rufang Peng
Summary: This study synthesized novel arylmalonamide[70]fullerocyclopropanes and investigated their thermal stability and influence on the thermal decomposition of nitrocellulose. The results showed that these compounds can significantly improve the thermal stability of nitrocellulose, presenting promising potential for applications as stabilizers.
Article
Materials Science, Paper & Wood
Xiaofei Qi, Ning Yan, Hongyan Li, Yu Zhao, Peijin Liu, Qilong Yan
Summary: By performing dynamic mechanical analysis and molecular dynamic simulations, we discovered two mechanical relaxation processes in the nitrocellulose/plasticizer blend at different temperatures and revealed the mechanisms of temperature on relaxation. Furthermore, we observed the sudden enhancements on the mobility of polymer chain elements and the rotation of molecular bonds, as well as the decrease in the intensity of intermolecular interactions with the increase of temperature. These findings provide guidance for strengthening the performance of nitrocellulose-based propellants over a wide temperature range.
Editorial Material
Physics, Multidisciplinary
Mark Tame
Summary: It has been commonly believed that the quantum statistics of light are maintained when photons interact with plasmons. However, an analysis of the scattering process reveals that light can actually blend different plasmonic pathways, indicating that this assumption is not always true.
Article
Engineering, Multidisciplinary
Ling Liao, Bo Jin, Zhi-cheng Guo, Fei Xian, Chen-jie Hou, Ru-fang Peng
Summary: The study explores the impact of the position and number of pyrrolidine bound to the carbon cage on the stabilization effect of fulleropyrrolidine derivatives to nitrocellulose/nitroglycerine. Results show that the stabilization effect of the bisadducts is significantly better than that of monoadduct and C60, with different binding positions affecting the stabilization effect differently. Further analysis using EPR and FT-IR reveals different abilities of fulleropyrrolidine bisadducts to absorb nitroxide, consistent with the performance test results.
DEFENCE TECHNOLOGY
(2021)
Article
Multidisciplinary Sciences
Georgios Chondrogiannis, Shirin Khaliliazar, Anna Toldra, Pedro Reu, Mahiar M. Hamedi
Summary: The study shows that immobilized ACP on nitrocellulose paper retains its enzymatic function and can be easily and rapidly activated using agitation. This prevents leakage into the solution, opening up new possibilities for paper-based POC devices.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Multidisciplinary
Jie Xiong, Shuang Feng, Rufang Peng, Bo Jin
Summary: The stereoselective preparation of fullerene bis-adducts through nontethered methods is challenging due to the production of significant amount of regioisomers. The trans-4 aziridino[60]fullerenes were selectively synthesized without a catalyst by reacting octabromofullerene with corresponding aniline. Characterization through NMR, UV-vis spectroscopy, and X-ray analysis was provided. The possible synthesis process of highly regioselective trans-4-bisaziridino[60]fullerenes was proposed along with exploring their potential application as propellant stabilizers.
CHINESE JOURNAL OF CHEMISTRY
(2023)
Article
Nanoscience & Nanotechnology
Valentina Brega, Federica Scaletti, Xianzhi Zhang, Li-Sheng Wang, Prudence Li, Qiaobing Xu, Vincent M. Rotello, Samuel W. Thomas
ACS APPLIED MATERIALS & INTERFACES
(2019)
Article
Chemistry, Multidisciplinary
Matthew J. Feeney, Samuel W. Thomas
Article
Chemistry, Physical
Seth A. Sharber, Samuel W. Thomas
CHEMISTRY OF MATERIALS
(2020)
Article
Chemistry, Organic
Yu Yan, Zachary A. Lamport, Ioannis Kymissis, Samuel W. Thomas
JOURNAL OF ORGANIC CHEMISTRY
(2020)
Article
Nanoscience & Nanotechnology
Valentina Brega, Samuel W. Thomas
Summary: This paper introduces a new type of fluorophores, conjugated polymer nanoparticles (CPNs), that exhibit a ratiometric response upon photo-oxidation and can be tuned for emission wavelength by blending different conjugated polymers and dopants. Through a rational design process and refining the compositions, these CPNs possess desirable characteristics for analytical applications such as utility in aqueous environments, high quantum yield, emission of red light, and ratiometric luminescent responses.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Review
Chemistry, Physical
Seth A. Sharber, William J. Mullin, Samuel W. Thomas
Summary: This article discusses the importance of controlling the packing of pi-conjugated materials for their properties and performance, introduces the application of halogen bonding and interactions of aromatic rings in noncovalent control, demonstrates the achievement of specific solid-state properties through design assembly, and suggests strategies for future designs of π-conjugated molecular materials.
CHEMISTRY OF MATERIALS
(2021)
Review
Polymer Science
William J. Mullin, Seth A. Sharber, Samuel W. Thomas
Summary: Organic conjugated polymers and oligomers are important in electronic applications due to their solution processability and structural tunability, with the optoelectronic properties influenced by constitutional structure in dilute environments and by intramolecular conformation and intermolecular electronic coupling in the solid state. Developing strategies to optimize solid-state packing is crucial for enhancing electronic capabilities of conjugated materials.
JOURNAL OF POLYMER SCIENCE
(2021)
Article
Biochemistry & Molecular Biology
Valentina Brega, Samuel W. Thomas
Summary: This paper evaluates the impact of the regiochemistry of pyridinium rings in isomeric pyridinium alkynylanthracenes on their performance as photosensitizers for PDT in HeLa cells, offering new insights for the development of photodynamic therapy.
PHOTOCHEMISTRY AND PHOTOBIOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Yu Yan, Matthew Feeney, Luke M. Davis, Samuel W. Thomas
Summary: A simple approach to cross-link free-standing hydrogen-bonded LbL films was reported in this paper, in which the stiffness of the films increased by three orders of magnitude upon cross-linking with Fe3+. The mechanical properties of these films can also be tuned using light by the photoinduced reduction of coordinated iron(III) ions.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Chemistry, Organic
Yu Yan, Valentina Brega, Manuel M. Pina, Samuel W. Thomas
Summary: The photochemical oxidations of acenes can pose challenges for their optoelectronic applications, but they also form the basis for many luminescent sensing schemes. Diethynyl substitution is widely adopted to control oxidation and improve solubility and processability of long acenes, but the influence of differences between the alkyne groups on key properties of long acenes remains largely unknown.
ORGANIC & BIOMOLECULAR CHEMISTRY
(2023)
Article
Materials Science, Multidisciplinary
William J. Mullin, Peter Mueller, Anthony J. Schaefer, Elisa Guzman, Steven E. Wheeler, Samuel W. Thomas
Summary: This study investigates the stacking interactions between aromatic rings and heterocycles, revealing that fluorinated side-chains and electron-rich units have interactions in the solid state, while electron-deficient units are incompatible. These interactions play a significant role in compound stability.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Review
Chemistry, Organic
Valentina Brega, Yu Yan, Samuel W. Thomas
ORGANIC & BIOMOLECULAR CHEMISTRY
(2020)
Article
Chemistry, Multidisciplinary
William J. Mullin, Huan Qin, Tomoyasu Mani, Peter Mueller, Matthew J. Panzer, Samuel W. Thomas
CHEMICAL COMMUNICATIONS
(2020)
Article
Materials Science, Multidisciplinary
Seth A. Sharber, Arielle Mann, Kuo-Chih Shih, William J. Mullin, Mu-Ping Nieh, Samuel W. Thomas
JOURNAL OF MATERIALS CHEMISTRY C
(2019)
Article
Materials Science, Multidisciplinary
William J. Mullin, Robert H. Pawle, Seth A. Sharber, Peter Mueller, Samuel W. Thomas
JOURNAL OF MATERIALS CHEMISTRY C
(2019)
