本文采用吸湿性串联差分式电迁移粒径谱仪(Hygros-copicity Tandem Diferential Mobility Analyzer,H-TDMA)和气溶胶组分监测仪(S-611EG),对成都市2019年1—2月气溶胶粒子吸湿增长因子(GF)、气溶胶液态含水量(ALWC)、气溶胶谱分布(PNSD...本文采用吸湿性串联差分式电迁移粒径谱仪(Hygros-copicity Tandem Diferential Mobility Analyzer,H-TDMA)和气溶胶组分监测仪(S-611EG),对成都市2019年1—2月气溶胶粒子吸湿增长因子(GF)、气溶胶液态含水量(ALWC)、气溶胶谱分布(PNSD)、粒子化学组分进行观测,并结合气象要素分析了成都市大气气溶胶吸湿效应及其对能见度的影响。结果表明:(1)成都冬季40~200 nm的非吸湿模态粒子(GF_(NH))的吸湿增长因子随粒径增大而减小,强(弱)吸湿模态粒子的吸湿增长因子(GFMH,LH)均随粒径增大而增大,非(弱)吸湿性粒子比例(NF_(NH,LH))随粒径增大而减少。(2)成都冬季气溶胶液态含水量由爱根核模态和积聚模态粒子占主导,其中爱根核模态对ALWC贡献最大。相对湿度(RH)、细颗粒物(PM_(2.5))对ALWC的影响力依次降低,高PM_(2.5)且高RH是高ALWC的充分条件。(3)不利气象条件是成都此次雾霾过程的主要成因,低能见度在低RH时由PM_(2.5)积累所致,而气溶胶吸湿增长效应在高RH时主导能见度下降。展开更多
We proposed a strategy using high-concentration tannic acid(TA) solutions to form robust and dense supramolecular networks in hydrogels,driven by the high osmotic pressure of the TA solution.The resulting hydrogels ar...We proposed a strategy using high-concentration tannic acid(TA) solutions to form robust and dense supramolecular networks in hydrogels,driven by the high osmotic pressure of the TA solution.The resulting hydrogels are both transparent and tough,with highly compacted networks.The hydrogels exhibit an ultimate tensile strength of approximately 4.55 MPa and a toughness of 160 MJ/m^(3).Additionally,the hydrogels adhere to a wide range of substrates,including metals,ceramics,glass,and even Teflon,with an adhesion strength of up to 42 kPa on Teflon plates.Given the biocompatibility and biodegradability of both PVA and TA,along with the hydrogels' toughness,transparency,and adhesiveness,we anticipated broad applications in the biomedical field,such as in articular cartilage restoration,electronic skin,and wound dressings.Additionally,these hydrogels hold significant potential for applications in wearable technology and optoelectronic devices.展开更多
基金Funded by the Guangdong Major Project of Basic and Applied Basic Research(No.2021B0301030001)the National Key Research and Development Program of China(No. 2021YFB3802300)the National Natural Science Foundation of China(Nos. 52403153 and 52203169)。
文摘We proposed a strategy using high-concentration tannic acid(TA) solutions to form robust and dense supramolecular networks in hydrogels,driven by the high osmotic pressure of the TA solution.The resulting hydrogels are both transparent and tough,with highly compacted networks.The hydrogels exhibit an ultimate tensile strength of approximately 4.55 MPa and a toughness of 160 MJ/m^(3).Additionally,the hydrogels adhere to a wide range of substrates,including metals,ceramics,glass,and even Teflon,with an adhesion strength of up to 42 kPa on Teflon plates.Given the biocompatibility and biodegradability of both PVA and TA,along with the hydrogels' toughness,transparency,and adhesiveness,we anticipated broad applications in the biomedical field,such as in articular cartilage restoration,electronic skin,and wound dressings.Additionally,these hydrogels hold significant potential for applications in wearable technology and optoelectronic devices.
