positively charged造句 31. In the wash solution, these positively charged cationic adsorb to the negatively charged surface of fabrics. 32. Amino acids are positively charged ( cationic ) at low pH and negatively charged ( anionic ) at high pH. 33. Alpha particles are positively charged helium nuclei obtained from natural radioactive decay. 34. Fusing heavy hydrogen isotopes requires lots of energy, partly because the nuclei are positively charged and repel each other.