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New biodegradable paper-based films are a hot research topic in the development of green agriculture. In this study, a black paper-based film coated with cooked tung oil with excellent mechanical properties, a hydrophobic surface, high heat transfer and strong weather resistance was prepared by spraying high-pigment carbon black solution on the surface of base paper. The results showed that the surface-solidified oil film had a rough structure produced via the brush coating process using cooked tung oil. The base film of the black paper had a given hydrophobic structure, and the contact angle reached 98.9°. Cooked tung oil permeates into the inside of the paper base, and after curing, it forms a multi-dimensional network film structure. The maximum tensile stress of the black paper base film is about 123% higher than that of the original paper base film. The coloring of carbon black gives the black paper base film a heat conduction effect, and the average heat transfer rate reaches 15.12 °C/s. Cooked tung oil is combined with the paper-based fiber high-toughness layer to form a stable system. The existence of a cured film improves the basic mechanics and hydrophobicity, and the resistance to ultraviolet radiation and hot air is greatly improved. This study provides a feasible scheme for the application of a black paper base film coated with cooked tung oil. [ABSTRACT FROM AUTHOR]

Long-term labeling of the plasma membrane is crucial for visualizing membrane protein expression and morphological changes but is challenging due to the high fluidity of the plasma membrane, which can lead to probe diffusion or internalization of cells. Here, we precisely control the localization of carbon dots (M-CDs) on the plasma membrane without internalization after long-term observation under fluorescence microscopy. Adjusting the molar ratio of folic acid to o -phenylenediamine allowed fine-tuning of the water solubility and fluorescence emission of the carbon dots. Notably, carbon dots synthesized with a folic acid to o -phenylenediamine molar ratio of 1 : 10 (referred to as M-CD) exhibit excellent cell membrane targeting, likely due to the combination of suitable water-solubility and FA-FR affinity. The photostability of M-CDs is significantly superior to that of the commercial CellMask Crimson, allowing for specific recognition of folic acid receptor-positive cancer cells and minimal internalization over a period of up to 9 hours. This photostable, membrane-targeting M-CD provides a powerful tool for accurately, real-time, and non-invasively assessing the expression of folic acid receptors on cancer cell membranes and tumor metastasis., Competing Interests: The authors declare no competing interests., (This journal is © The Royal Society of Chemistry.)