Hydro‐Assisted Self‐Regenerating Brominated<i>N</i>‐Alkylated Thiophene Diketopyrrolopyrrole Dye Nanofibers—A Sustainable Synthesis Route for Renewable Air Filter Materials

Ravi, Sai Kishore; Singh, Varun Kumar; Suresh, L. Padma; Ku, Calvin; Vijayavenkataraman, Sanjairaj; Nandakumar, Dilip Krishna; Chen, Yun; Sun, Wanxin; Sit, Patrick H.‐L.; Tan, Swee Ching

doi:10.1002/smll.201906319

Cited by 13 publications

(11 citation statements)

References 56 publications

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“…[ 1–4 ] Traditional medical masks consist of three layers of polypropylene (PP) non‐woven webs, including two layers of outer electrospun non‐woven webs and one layer of an inner melt‐blown web. [ 5–7 ] Considering that the pore size of the melt‐blown fabric is small (2 µm) [ 8,9 ] and it is charged after electret treatment, [ 10–13 ] small virus carrying particles filtered by the outer non‐woven fabric are adsorbed onto it. [ 14,15 ] Accordingly, medical masks can effectively block viral carrying particles to prevent infection.…”

Section: Introductionmentioning

confidence: 99%

New Hydrogen Bonding Enhanced Polyvinyl Alcohol Based Self‐Charged Medical Mask with Superior Charge Retention and Moisture Resistance Performances

Wang

Feng

Zheng

et al. 2021

Adv Funct Materials

102

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The water vapor exhaled by the human body can severely accelerate the charge dissipation of a polypropylene (PP)-based medical mask, thereby reducing the electrostatic adsorption efficiency to cause infection. To solve this problem, a new type of polyvinyl alcohol (PVA)-based medical mask through electrostatic spinning to replace the PP melt-blown layer, which has self-charging and charge retention performance in a high humidity environment is fabricated. The PVA is rich in hydroxyl groups, which can spontaneously form hydrogen bonds with water vapor molecules exhaled by the human body and fix water molecules to increase the triboelectricity. By analyzing the electrical output performance of PVA-based triboelectric nanogenerator (TENG), it is shown that the short circuit current is ≈26 times larger than that of PP-based TENG in 95% relative humidity (RH). Moreover, PVA has a strong charge storage capacity and self-charging performance, as determined by hand touching under a high humidity environment. The static dissipation rate of PVA is 1.4 times lower than that of PP at a 95% RH. In comparison with PP-based medical masks, PVAbased medical masks have a high humidity resistance and self-charging performance and can be easily recharged in situ by hand slapping without taking it off for many times.

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Section: Introductionmentioning

confidence: 99%

New Hydrogen Bonding Enhanced Polyvinyl Alcohol Based Self‐Charged Medical Mask with Superior Charge Retention and Moisture Resistance Performances

Wang

Feng

Zheng

et al. 2021

Adv Funct Materials

102

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“…[36] Интересно также сравнить значения энергии связывания в димерах Eb(dimer) (рис. 9), реализуемое как по водородному связыванию, так и по π-π стекингу, и сравнить значения с опубликованными данными [1,2] для аналогичных систем. Р и с .…”

Section: результаты расчетов и их обсуждениеunclassified

“…Исследуемые материалы могут использоваться в области органической электроники, в частности, для органических полевых транзисторов. Ключевые слова: акцептор, дикетопирролопиррол, фуран, водородная связь, адсорбция, графит, самосборка, монослой, молекулярная динамика Диарил-дикетопирролопирролы (DPP), состоящие из акцепторного DPP ядра, замещенного различными π-избыточными гетероциклами-флангами [1,2] (тиофеном (Th), фенилом (Ph), фураном (Fu)), находят свое применение в построении супрамолекулярных архитектур благодаря нескольким типам нековалентных взаимодействий. Среди них -водородное связывание, где донором выступает азоты DPP, а акцептором -атомы кислорода DPP, π-π стекинг, реализуемый или между молекулами в стопках, или между флангами соседних молекул в слое, а также специфические взаимодействия, [3,4].…”

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“…Эту корреляцию между кристаллическими структурами и электронными взаимодействиями в производных DPP можно объяснить с помощью модели взаимодействия экситонов Каши. В настоящее время N-незамещенные DPP, образующие нековалентные полимеры (2D) или кристаллы типа "кирпичная кладка" (3D) [1,2,[8][9][10][11][12][13][14][15][16][17], а также жидкие кристаллы [18] интенсивно изучаются ведущими мировыми лабораториями.…”

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Adlayers of Acceptor Blocks Based on Diketopyrrolo-Pyrrole on Graphite: Self-Assembly and Structure Revealed in All-Atom Modelling

Хаджаб¹,

Guskova²

2021

Вестник Тверского Государственного Университета. Серия: Химия

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В данной статье исследуются адсорбционные слои электроноакцепторных N -незамещенных дифуран-дикетопирролопирролов на поверхности графита. Рассматриваются три конформера, получающиеся внутримолекулярным вращением и различающиеся взаимным расположением центрального дикетопирролопиррольного блока и фурановых заместителей: состояния. Адсорбционные слои образуются в процессе самосборки на поверхности графита за счет межмолекулярной водородной связи, как показывает атомистическое молекулярно-динамическое моделирование. В расчетах имитируется экспериментальный процесс создания слоев, называемый методом нанесения капли. Во всех смоделированных системах наблюдается образование стабильных супрамолекулярных полимеров - длинных упорядоченных ассоциатов на поверхности. Однако, энергия межмолекулярного связывания в этих полимерах и сила и тип водородной связи зависят в той или иной мере от конформации. Каждая из перечисленных характеристик проанализирована количественно, с помощью чего представлена молекулярная картина построения слоев дифуран-дикетопирролопиррола. Исследуемые материалы могут использоваться в области органической электроники, в частности, для органических полевых транзисторов. In this computational work, we investigate the adsorption layers of electron-deficient N -unsubstituted difuran-diketopyrrolopyrroles. Three conformational states differing in the mutual orientation of the central diketopyrrolopyrrole unit and furan flanks are distinguished: . The adsorption layers are obtained during self-assembly on graphite surface through intermolecular hydrogen bonding in all-atom MD simulations. The experimental process for the construction of the adlayers called the spin-coating technique is reproduced in the modelling. In all simulated systems, the formation of stable supramolecular polymers is observed which build the ordered carpets on the surface. However, the binding energetics and the strength and the type of the hydrogen bonding are highly sensitive to the molecular conformation. We quantify each of these characteristics and provide a molecular picture of difuran-diketopyrrolopyrrole adlayers relevant for organic field-effect transistor applications.

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“…Recently, various materials and technologies have been made to develop different kinds of new air filter materials, such as electrospinning [4][5][6]; electrostatic precipitation [7][8][9]; corona charging [10,11]; metal-organic framework (MOF)-based filter media [12][13][14]; selfassembled nanofibers based recyclable air filters [15]; and spun-bond [16][17][18], needlepunching [19][20][21] and melt-blown [22][23][24] nonwovens. Among these, the electrospinning fibers with small diameter and dense packing exhibit excellent filtration efficiency for fine particulate matter, but the undesirable high pressure-drop and low dust holding capacity restrict their application [25].…”

Section: Introductionmentioning

confidence: 99%

A Cleanable Self-Assembled Nano-SiO2/(PTFE/PEI)n/PPS Composite Filter Medium for High-Efficiency Fine Particulate Filtration

Luo

Shen

et al. 2021

Materials

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A silicon dioxide/polytetrafluoroethylene/polyethyleneimine/polyphenylene sulfide (SiO2/PTFE/PEI/PPS) composite filter medium with three-dimensional network structures was fabricated by using PPS nonwoven as the substrate which was widely employed as a cleanable filter medium. The PTFE/PEI bilayers were firstly coated on the surfaces of the PPS fibers through the layer-by-layer self-assembly technique ten times, followed by the deposition of SiO2 nanoparticles, yielding the SiO2/(PTFE/PEI)10/PPS composite material. The contents of the PTFE component were easily controlled by adjusting the number of self-assembled PTFE/PEI bilayers. As compared with the pure PPS nonwoven, the obtained SiO2/(PTFE/PEI)10/PPS composite material exhibits better mechanical properties and enhanced wear, oxidation and heat resistance. When employed as a filter material, the SiO2/(PTFE/PEI)10/PPS composite filter medium exhibited excellent filtration performance for fine particulate. The PM2.5 (particulate matter less than 2.5 μm) filtration efficiency reached up to 99.55%. The superior filtration efficiency possessed by the SiO2/(PTFE/PEI)10/PPS composite filter medium was due to the uniformly modified PTFE layers, which played a dual role in fine particulate filtration. On the one hand, the PTFE layers not only increase the specific surface area and pore volume of the composite filter material but also narrow the spaces between the fibers, which were conducive to forming the dust cake quickly, resulting in intercepting the fine particles more efficiently than the pure PPS filter medium. On the other hand, the PTFE layers have low surface energy, which is in favor of the detachment of dust cake during pulse-jet cleaning, showing superior reusability. Thanks to the three-dimensional network structures of the SiO2/(PTFE/PEI)10/PPS composite filter medium, the pressure drop during filtration was low.

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Hydro‐Assisted Self‐Regenerating BrominatedN‐Alkylated Thiophene Diketopyrrolopyrrole Dye Nanofibers—A Sustainable Synthesis Route for Renewable Air Filter Materials

Cited by 13 publications

References 56 publications

New Hydrogen Bonding Enhanced Polyvinyl Alcohol Based Self‐Charged Medical Mask with Superior Charge Retention and Moisture Resistance Performances

New Hydrogen Bonding Enhanced Polyvinyl Alcohol Based Self‐Charged Medical Mask with Superior Charge Retention and Moisture Resistance Performances

Adlayers of Acceptor Blocks Based on Diketopyrrolo-Pyrrole on Graphite: Self-Assembly and Structure Revealed in All-Atom Modelling

A Cleanable Self-Assembled Nano-SiO2/(PTFE/PEI)n/PPS Composite Filter Medium for High-Efficiency Fine Particulate Filtration

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